[go: up one dir, main page]

WO2012086416A1 - Méthode de traitement par digestion anaérobie et appareil de traitement par digestion anaérobie - Google Patents

Méthode de traitement par digestion anaérobie et appareil de traitement par digestion anaérobie Download PDF

Info

Publication number
WO2012086416A1
WO2012086416A1 PCT/JP2011/078311 JP2011078311W WO2012086416A1 WO 2012086416 A1 WO2012086416 A1 WO 2012086416A1 JP 2011078311 W JP2011078311 W JP 2011078311W WO 2012086416 A1 WO2012086416 A1 WO 2012086416A1
Authority
WO
WIPO (PCT)
Prior art keywords
organic waste
anaerobic digestion
heat
digestion
anaerobic
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2011/078311
Other languages
English (en)
Japanese (ja)
Inventor
花岡　平
孝一 土居
勝裕 椿井
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Kakoki Kaisha Ltd
Original Assignee
Mitsubishi Kakoki Kaisha Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mitsubishi Kakoki Kaisha Ltd filed Critical Mitsubishi Kakoki Kaisha Ltd
Publication of WO2012086416A1 publication Critical patent/WO2012086416A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
    • B01D61/14—Ultrafiltration; Microfiltration
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00—Treatment of sludge; Devices therefor
    • C02F11/02—Biological treatment
    • C02F11/04—Anaerobic treatment; Production of methane by such processes
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12M—APPARATUS FOR ENZYMOLOGY OR MICROBIOLOGY; APPARATUS FOR CULTURING MICROORGANISMS FOR PRODUCING BIOMASS, FOR GROWING CELLS OR FOR OBTAINING FERMENTATION OR METABOLIC PRODUCTS, i.e. BIOREACTORS OR FERMENTERS
    • C12M21/00—Bioreactors or fermenters specially adapted for specific uses
    • C12M21/04—Bioreactors or fermenters specially adapted for specific uses for producing gas, e.g. biogas
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12M—APPARATUS FOR ENZYMOLOGY OR MICROBIOLOGY; APPARATUS FOR CULTURING MICROORGANISMS FOR PRODUCING BIOMASS, FOR GROWING CELLS OR FOR OBTAINING FERMENTATION OR METABOLIC PRODUCTS, i.e. BIOREACTORS OR FERMENTERS
    • C12M45/00—Means for pre-treatment of biological substances
    • C12M45/02—Means for pre-treatment of biological substances by mechanical forces; Stirring; Trituration; Comminuting
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12M—APPARATUS FOR ENZYMOLOGY OR MICROBIOLOGY; APPARATUS FOR CULTURING MICROORGANISMS FOR PRODUCING BIOMASS, FOR GROWING CELLS OR FOR OBTAINING FERMENTATION OR METABOLIC PRODUCTS, i.e. BIOREACTORS OR FERMENTERS
    • C12M45/00—Means for pre-treatment of biological substances
    • C12M45/20—Heating; Cooling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2315/00—Details relating to the membrane module operation
    • B01D2315/06—Submerged-type; Immersion type
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00—Treatment of sludge; Devices therefor
    • C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
    • C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00—Treatment of sludge; Devices therefor
    • C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
    • C02F11/14—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
    • C02F11/143—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents using inorganic substances
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00—Treatment of sludge; Devices therefor
    • C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
    • C02F11/14—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
    • C02F11/147—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents using organic substances
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00—Treatment of sludge; Devices therefor
    • C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
    • C02F11/14—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
    • C02F11/148—Combined use of inorganic and organic substances, being added in the same treatment step
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00—Treatment of sludge; Devices therefor
    • C02F11/18—Treatment of sludge; Devices therefor by thermal conditioning
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E50/00—Technologies for the production of fuel of non-fossil origin
    • Y02E50/30—Fuel from waste, e.g. synthetic alcohol or diesel

Definitions

  • the present invention relates to an anaerobic digestion treatment method and an anaerobic digestion treatment apparatus for organic waste, and more particularly, to a method and apparatus for heat solubilizing organic waste in a continuous manner.
  • Anaerobic digestion treatment using anaerobic organisms can be used as a method for treating organic waste such as food waste, livestock manure and sewage sludge.
  • organic waste such as food waste, livestock manure and sewage sludge.
  • the organic waste charged in the anaerobic digestion tank is heated to a predetermined temperature, and the hydrogen ion index (hereinafter referred to as “pH (potential Hydrogen)”) in the organic waste is used. Adjust to a predetermined pH value.
  • pH potential Hydrogen
  • the organic waste is subjected to methane fermentation through solubilization, hydrolysis and acid fermentation, and the solid content in the organic waste is decomposed into digestion gas and carbon dioxide, and the solid content of the organic waste is reduced. Volume can be reduced.
  • the organic waste in order to improve the decomposition rate of the anaerobic digestion treatment, the organic waste is heated to a predetermined temperature to hydrolyze the solid content of the organic waste.
  • the heat-solubilized sludge which is a heat-solubilized organic waste, was put into an anaerobic digester.
  • Patent Document 1 discloses that a high-temperature steam is supplied into a heat-solubilization reactor having a pressure control valve for adjusting the pressure, and the heat-solubilization reactor has a high temperature and a high pressure.
  • a technique is disclosed in which organic waste is supplied to the organic waste to heat-solubilize the organic waste.
  • Patent Document 2 a heat exchanger is provided in the heat solubilization reactor, and the organic waste charged in the heat solubilization reactor is heated by the heat exchanger to heat solubilize the organic waste. Techniques to do this are disclosed.
  • the heat-solubilization process described in Patent Document 1 is a batch type in which heat-solubilized sludge is discharged from the heat-solubilization reactor and high-temperature steam in the heat-solubilization reactor is discharged. Therefore, in order to heat solubilize the next organic waste, it has been necessary to supply high-temperature steam again in the heat solubilization reactor. In other words, according to this batch method, high-temperature steam is supplied every time organic waste is introduced into the heat-solubilization reactor during the heat-solubilization treatment, so a huge amount of heat energy is required. It was.
  • the crushed solid matter is not a batch type as described in Patent Document 1, but the steam supplied in the heat solubilization reactor is retained.
  • a continuous heat solubilization process in which the supply of heat and the discharge of heat solubilized sludge can be considered.
  • the solid matter of the organic waste blocks the pressure control valve of the heat solubilization reactor, and the inside of the heat solubilization reactor cannot be controlled to a predetermined pressure. There was a problem. Therefore, in the conventional heat solubilization treatment, a releasable batch type heat solubilization reactor can only be used so that sludge clogged in the pressure control valve of the heat solubilization reactor can be removed.
  • the present invention is an invention created in view of the above problems, and an anaerobic digestion process capable of continuous heat solubilization treatment by preventing or suppressing clogging of the pressure control valve by heat solubilized sludge. It is an object to provide a method and an anaerobic digestion treatment apparatus.
  • the anaerobic digestion treatment method is an anaerobic digestion treatment method for anaerobically digesting a heat-solubilized organic waste obtained by subjecting an organic waste to be treated to a heat-solubilization treatment.
  • the target organic waste is crushed to a size less than the maximum distance between the valve body and the valve seat at the maximum opening of the pressure control valve for adjusting the pressure by the crushing device, and is crushed solid matter
  • Anaerobic digestion step of anaerobic digestion treatment of the solubilized organic waste, and in the heat solubilization step the heat solubilization is performed in a state where the steam supplied in the heat solubilization reactor is retained. Feeding said crushed solids into a reactor; and And performing the discharge of the heat solubilizing organic waste from Kinetsu
  • the organic waste supplied into the heat solubilization reactor is separated from the valve body at the maximum opening of the pressure control valve by the crushing process. It is a crushed solid material crushed to a size less than the maximum distance between the valve seats. Therefore, in the heat solubilization process, since the heat solubilized organic waste is prevented or suppressed from closing the pressure control valve, the steam supplied in the heat solubilization reactor is crushed while being retained. It is possible to perform a continuous heat solubilization process for supplying solids and discharging heat-solubilized organic waste.
  • the anaerobic digestion method of the present invention performs continuous heat solubilization treatment in the heat solubilization treatment step, so that organic waste is introduced into the heat solubilization reactor as in the prior art. Therefore, it is possible to reduce the heat energy consumed compared to the conventional anaerobic digestion method. Further, according to the present invention, since a heat exchanger is not used as the heating means in the heat solubilization step, work such as scale removal becomes unnecessary, and management of the heat solubilization reactor becomes easy.
  • the anaerobic digestion processing method according to claim 2 is characterized in that at least a part of the organic waste to be treated is an organic waste subjected to anaerobic digestion. According to the anaerobic digestion processing method of claim 2, since the crushing step, the heat solubilization step and the anaerobic digestion step are performed again on the organic waste already subjected to the anaerobic digestion treatment, This makes it possible to further reduce the volume of solids in the waste and further increase the proportion of digested gas recovered.
  • the anaerobic digestion treatment method is an acid fermentation step in which the heat-solubilized organic waste is supplied into an anaerobic digestion tank and subjected to acid fermentation, and the acid fermentation is performed.
  • a methane fermentation process in which organic waste is methane-fermented in the anaerobic digester, and the acid fermentation process and the methane fermentation process include the high-temperature heat discharged from the heat-solubilization reactor. Supplying solubilized organic waste into the anaerobic digester, and using the organic waste in the anaerobic digester as a heat source for heating to a temperature suitable for acid fermentation or methane fermentation Features.
  • anaerobic digestion processing method in the heating of organic waste in the acid fermentation process and the methane fermentation process of the anaerobic digestion process, a high-temperature heat-solubilized sludge is used as a heat source.
  • a heat exchanger is not required in the digestion tank, and the heat energy to be used can be reduced.
  • the two treatment processes of the acid fermentation process and the methane fermentation process in the anaerobic digestion process are performed in one treatment tank, the anaerobic treatment facility can be simplified.
  • the anaerobic digestion processing method in the anaerobic digestion step, directly inputs a processing target organic waste different from the processing target organic waste into the anaerobic digestion tank,
  • Another organic waste to be treated is an organic waste having a decomposition rate higher than that of the organic waste to be treated only by the anaerobic digestion treatment.
  • another organic waste to be treated which is an organic waste that does not require a heat solubilization process due to a high decomposition rate only by the anaerobic digestion process. Is directly fed into the anaerobic digester without being supplied into the heat solubilization reactor, so that the heat solubilization treatment of the separate organic waste to be treated is not performed. It suffices to provide a heat solubilization reactor having a capacity commensurate with the amount of organic waste to be treated, and the investment cost can be kept low.
  • the anaerobic digestion treatment method includes an acid fermentation step in which the heat-solubilized organic waste is supplied into a storage tank and subjected to acid fermentation, and the acid-fermented heat.
  • An organic waste is supplied into the storage tank and used as a heat source for heating the organic waste in the storage tank to a temperature suitable for acid fermentation.
  • anaerobic digestion method in the heating of organic waste necessary for acid fermentation in the storage tank, a high-temperature heat-solubilized organic waste is used as a heat source. Or a heat exchanger becomes unnecessary in an anaerobic digester, and it becomes possible to aim at reduction of the heat energy to be used.
  • the two processes of the acid fermentation process and methane fermentation process in the anaerobic digestion process are performed separately, the conditions suitable for each of the acid fermentation process and the methane fermentation process can be controlled. Anaerobic digestion treatment becomes possible.
  • the anaerobic digestion processing method in the anaerobic digestion step, directly inputs a processing target organic waste different from the processing target organic waste into the storage tank.
  • the organic waste to be treated is an organic waste having a decomposition rate higher than that of the organic waste to be treated only by the anaerobic digestion treatment.
  • another organic waste to be treated which is an organic waste that does not require a heat solubilization process due to a high decomposition rate only by the anaerobic digestion process. Is directly supplied into the storage tank without being supplied into the heat solubilization reactor, and therefore, the same effect as that of the invention according to claim 4 is exerted.
  • the anaerobic digestion treatment method is an acid in which acid treatment is performed by directly feeding a treatment target organic waste different from the treatment target organic waste into a storage tank.
  • a fermentation process, and a methane fermentation process in which the acid-fermented organic waste is supplied into an anaerobic digester and fermented with methane, and the methane fermentation process is performed at a high temperature discharged from the heat solubilization reactor.
  • the heat-solubilized organic waste is directly supplied into the anaerobic digester, and the organic waste in the anaerobic digester is used as a heat source for heating to a temperature suitable for methane fermentation, A part of the organic waste subjected to the anaerobic digestion treatment in the anaerobic digestion tank is supplied to the crushing apparatus as the organic waste to be treated.
  • the high-temperature heat-solubilized organic waste is used as the heat source. Since it is directly supplied into the tank, a heat exchanger is not required in the anaerobic digestion tank, and the heat energy to be used can be reduced.
  • the organic waste to be treated that has not been heat-solubilized in the heat-solubilization reactor is first supplied to the storage tank for acid fermentation treatment, and then supplied to the anaerobic digestion tank for anaerobic digestion treatment. Is done.
  • a part of the post-digestion organic waste discharged from the anaerobic digestion tank is conveyed to the crushing device as a processing target organic waste to be heat-solubilized and crushed, and then the heat-solubilization reactor 30. And heat solubilized. Therefore, volume reduction of the solid content of the organic waste supplied to the crushing apparatus is achieved, and the crushing apparatus can be downsized. Furthermore, since the load of the heat solubilization reactor is reduced, the heat solubilization reactor can be downsized.
  • the anaerobic digestion treatment method includes a dehydration step in which the organic waste to be treated is dehydrated by a dehydration apparatus to collect dehydrated solids, and the crushed solids are The dehydrated solid material crushed by the crushing device, and the crushing device comprises a rotating knife that cuts the dehydrated solid material by rotating, and a fixed perforated plate from which the dehydrated solid material is extruded in a rod shape.
  • the chopper type crushing apparatus has a dehydration process in which the solid content concentration in the dehydrated solid is 10 wt% to 30 wt%. In the heat solubilization process, the inside of the heat solubilization reactor The steam is supplied so as to be 120 ° C. to 180 ° C.
  • the dehydrated solid can be crushed to a predetermined size, and the pressure regulating valve Is prevented or suppressed. Further, since the solid content concentration in the dehydrated solid becomes 10 Wt% to 30 Wt% by the dehydration step, it is possible to prevent the heat from being deprived of moisture in the heating in the heat solubilization step.
  • the anaerobic digestion treatment method according to any one of claims 11 to 14, wherein the polymer flocculant is added to the post-digestion organic waste subjected to anaerobic digestion in the anaerobic digestion step, Alternatively, a flocculant addition step of adding an aluminum-based inorganic flocculant and a polymer flocculant, and the polymer flocculant is added or the inorganic flocculant and the polymer flocculant are added And a post-digestion dehydration step in which the post-digestion organic waste is dehydrated by a post-digestion dehydration apparatus.
  • the particles suspended in the water in the organic waste after digestion are aggregated to form a floc in the flocculant addition step. Become. Therefore, since the particle
  • the anaerobic digestion treatment method comprising: a post-digestion dehydration step in which organic waste that has been anaerobically digested in the anaerobic digestion step is dehydrated by a post-digestion dehydration apparatus; Addition of the polymer flocculant to the dehydrated filtrate discharged in the post-dehydration step or addition of an iron-based or aluminum-based inorganic flocculant and a polymer flocculant; and the polymer flocculence Or a filtration step of filtering the dehydrated filtrate to which the inorganic flocculant and the polymer flocculant have been added with a flocculent filtration membrane device.
  • the polymer flocculant is added to the dehydrated filtrate dehydrated by the flocculant addition step, or the iron-based or aluminum-based inorganic flocculant is added. Since the agent and the polymer flocculant are added, particles suspended in the dehydrated filtrate, the chromaticity component, and the COD component are aggregated to form a floc. And since the particle
  • the anaerobic digestion processing apparatus is an anaerobic digestion processing apparatus that performs anaerobic digestion on a heat-solubilized organic waste obtained by heat-solubilizing a target organic waste.
  • a crushing device for crushing the organic waste to be processed into a crushing solid, and a pressure control valve for adjusting the pressure, the crushing solid and steam are supplied, and the crushing solid is
  • a heat-solubilizing reactor that converts the heat-solubilized organic waste, and an anaerobic digester for anaerobic digestion of the heat-solubilized organic waste,
  • the organic waste to be treated is crushed to a size less than the maximum distance between the valve body and the valve seat at the maximum opening of the pressure control valve, and the thermal solubilization reactor In the retained state, supply of the crushed solids and Characterized in that to enable discharge of the heat-solubilizing organic waste.
  • the dehydrated solid material supplied to the heat solubilization reactor is less than the maximum distance between the valve body and the valve seat when the pressure control valve is at the maximum opening. Since the crushing device for crushing is provided, it is prevented or suppressed that the heat-solubilized organic waste clogs the pressure control valve in the heat-solubilization reactor. Therefore, according to the anaerobic digestion processing apparatus according to claim 19, a continuous system that enables supply of crushed solids and discharge of heat-solubilized organic waste while the supplied steam is retained. It is possible to use a heat solubilization reactor.
  • the anaerobic digestion processing apparatus is provided with a circulation line for circulating a part of the organic waste subjected to the anaerobic digestion treatment in the anaerobic digestion tank to the crushing apparatus.
  • the crushing process, the heat solubilization process, and the anaerobic digestion process are performed again on some organic waste subjected to the anaerobic digestion process.
  • the anaerobic digestion processing apparatus includes a storage tank for acid-fermenting the heat-solubilized organic waste, and methane fermentation in anaerobic digestion is performed in the anaerobic digestion tank. It is characterized by.
  • the anaerobic digestion processing apparatus of Claim 21 has two processing tanks, the storage tank for performing acid fermentation in an anaerobic digestion process, and the anaerobic digestion tank for performing methane fermentation. Therefore, it can control to the conditions suitable for each process of an acid fermentation process and a methane fermentation process, and an efficient anaerobic digestion process is attained.
  • the anaerobic digestion processing apparatus includes a circulation line that circulates a part of the organic waste carried out of the anaerobic digestion tank into the anaerobic digestion tank.
  • the anaerobic digestion processing apparatus includes a storage tank stirring device that stirs the organic waste in the storage tank, and the storage tank has a storage tank.
  • the high-temperature heat-solubilized organic waste supplied to the storage tank is put into or near the storage tank stirrer.
  • the anaerobic digestion apparatus wherein the storage tank agitating device is disposed inside a cylindrical storage tank draft tube disposed in the storage tank and the storage tank draft tube.
  • a storage tank stirring blade for stirring the organic waste in the storage tank, and the high-temperature heat-solubilized organic waste supplied into the storage tank from the heat-solubilization reactor is The storage tank is introduced into the draft tube or toward the inside.
  • the anaerobic digestion processing apparatus wherein the storage tank agitation device includes a storage tank discharge pipe that discharges gas in the storage tank to the inside of the storage tank draft tube.
  • the anaerobic digestion apparatus wherein the storage tank agitating device stores a cylindrical storage tank draft tube disposed in the storage tank, and a gas in the storage tank in the gas phase.
  • a storage tank discharge pipe that discharges inside the tank draft tube, and the high-temperature heat-solubilized organic waste supplied from the heat-solubilization reactor into the storage tank is stored in the storage tank. It is characterized by being introduced into the draft tube for use or toward the inside.
  • anaerobic digestion treatment apparatus according to any one of claims 28 to 30, wherein the anaerobic digestion tank includes a stirring device for stirring organic waste in the anaerobic digestion tank, and the heat solubilization reactor The high-temperature heat-solubilized organic waste fed into the anaerobic digester is put into or near the stirrer.
  • the anaerobic digestion processing apparatus wherein the stirring device is disposed in a cylindrical draft tube disposed in the anaerobic digestion tank, and in the draft tube, and in the anaerobic digestion tank.
  • a high-temperature heat-solubilized organic waste fed into the anaerobic digester from the heat-solubilization reactor is disposed inside the draft tube. Or is introduced toward the inside.
  • the anaerobic digestion processing apparatus is characterized in that the agitation device includes a discharge pipe for discharging digestion gas collected from the anaerobic digestion tank into the draft tube.
  • the anaerobic digestion tank or the storage tank includes the stirring device, the organic waste in the anaerobic digestion tank or the storage tank, and the heat source The heat-solubilized organic waste supplied as can be mixed with stirring. Therefore, uniform temperature of the organic waste in the tank is promoted.
  • An anaerobic digestion apparatus includes a post-digestion dehydration apparatus that dehydrates organic waste digested anaerobically in the anaerobic digestion tank, and the post-digestion dehydration apparatus.
  • the polymer flocculant is added to the discharged dehydrated filtrate, or a flocculant addition device for adding an iron-based or aluminum-based inorganic flocculant and a polymer flocculant, and the polymer flocculant added.
  • a coagulation filtration membrane device for filtering the dehydrated filtrate to which the inorganic coagulant and the polymer coagulant are added.
  • the polymer flocculant is added by the flocculant addition apparatus 80 to the dehydrated filtrate that is dehydrated and discharged by the post-digestion dehydration processing apparatus.
  • flocculant it is filtered with a coagulation filtration membrane apparatus.
  • flocation filtration membrane apparatus As a result, it becomes possible to separate flocs, chromaticity components and COD components in the dehydrated filtrate, and thus suspension of the dehydrated filtrate can be prevented.
  • an anaerobic digestion treatment method capable of continuous heat solubilization treatment and anaerobic digestion treatment by preventing or suppressing clogging of the pressure control valve due to heat-solubilized organic waste.
  • the anaerobic digestion treatment apparatus 1a is fuel energy generated by anaerobic digestion of anaerobic organisms while reducing the solid content of organic waste and decomposing the solid content of organic waste. It is an apparatus for recovering methane gas.
  • the organic waste includes, for example, organic sludge such as sewage sludge and septic tank sludge, food waste, garbage, or livestock manure. As shown in FIG.
  • the anaerobic digestion processing apparatus 1a of the first embodiment is an organic waste to be treated that is an organic waste that is input to the anaerobic digestion processing apparatus 1a for anaerobic digestion processing.
  • the first dehydration processing apparatus 10 as a dehydration processing apparatus for performing dehydration of the water
  • the crushing apparatus 20 for crushing the dehydrated organic waste which is the dehydrated organic waste and the organic waste crushed by the crushing apparatus 20
  • a pressure-feeding device 25 that pumps the crushed organic waste, which is a waste
  • a heat-solubilization that heat-solubilizes the organic waste pumped through the pressure-feeding device 25 (here, crushed organic waste).
  • a reactor 30 an anaerobic digestion tank 40 that performs anaerobic digestion on heat-solubilized organic waste that is heat-solubilized organic waste; and a boiler that generates high-temperature steam using digestion gas as fuel. 50, with anaerobic digestion
  • a post-digestion dewatering device that separates the organic waste after digestion into solid (dehydrated sludge cake) and moisture (dehydrated filtrate) 2 dehydration processing device 60.
  • the 1st dehydration processing apparatus 10 is an apparatus for isolate
  • the first dehydration apparatus 10 is set so that the solid concentration in the dehydrated solid is 10 to 30 Wt% (wt / wt), preferably 15 to 25 Wt% (wt / wt).
  • the solid matter concentration is set to at least 10 Wt% or more, when the solid content of the organic waste is heat-solubilized in the heat solubilization reactor 30 described later, the heat energy is converted into the water in the organic waste.
  • the bacteria have a thick cell wall, and the moisture contained in the bacteria cannot be dehydrated unless dehydration treatment (for example, heat treatment, ozone treatment or alkali treatment) is performed, so that the solid matter exceeds 30 Wt%. Because it is virtually impossible to do.
  • dehydration treatment for example, heat treatment, ozone treatment or alkali treatment
  • the dehydrated filtrate generated in the first dehydration apparatus 10 is drained into the water treatment system together with the dehydrated filtrate discharged from the second dehydration apparatus 60 described later.
  • the crushing device 20 is a device for crushing the dehydrated solid matter.
  • the surface area of the dehydrated solid increases. Therefore, the surface area of the solid material that is heat-solubilized by hydrolysis in the heat-solubilization reactor 30 described later also increases, and the time required for heat-solubilization can be shortened.
  • the crushing device 20 crushes the dehydrated solid so that the crushed solid obtained by crushing the dehydrated solid becomes a predetermined size or less.
  • the predetermined size is the width of the throttle passage formed by the distance between the valve body of the pressure control valve 31 provided in the heat solubilization reactor 30 and the valve seat on which the valve body can be seated.
  • the predetermined size is a value that is less than the maximum distance between the valve body and the valve seat when the pressure control valve 31 is at the maximum opening.
  • the maximum distance is, for example, the width of the annular throttle passage between the valve body and the valve seat when an annular throttle passage is formed by the valve body and the valve seat.
  • the crushing device 20 is configured to remove dehydrated solids that are organic waste before crushing so that the crushing solids that are crushed solids have a size of 2 mm or less, more preferably 1 mm or less. Crush. Therefore, the predetermined size can be 2 mm or less, preferably 1 mm or less.
  • a crushing device 20 for crushing dehydrated solids to a predetermined size or less includes a rotary knife 21 that cuts the dehydrated solids by rotating, and a finer of less than 5 mm, more preferably less than 3 mm.
  • a chopper type crushing device 20 having a fixed perforated plate 22 in which holes are formed and dehydrated solids cut by the rotary knife 21 are pushed out in a rod shape.
  • the dehydrated solids sent from the first dehydrating apparatus 10 may be extruded from the fixed porous plate 22 after being cut by the rotary knife 21 in the crushing apparatus 20, or after being extruded from the fixed porous plate 22. You may cut
  • the crushing device 20 includes a rotary knife 21 and a fixed perforated plate 22 having the following specifications.
  • Rotating knife 21 4 blades, diameter 75mm Fixed perforated plate 22 Effective diameter: 75mm Plate thickness: 9mm Pore diameter: 3.2 mm Number of pores: 192
  • the object to be crushed includes twigs with a thickness of 1.5 mm to 2 mm and a length of about 3 cm, and thread breaks, hairs and diameters with a thickness of 0.1 mm and a length of about 4 cm to 6 cm.
  • the heat solubilization reactor 30 is a device for heat solubilizing crushed solids under conditions of high temperature and high pressure. In addition, when supplying crushed solids and discharging heat solubilized organic waste, It is a continuous heat solubilizer that retains steam without wasteful discharge.
  • the heat solubilization reactor 30 includes a container into which crushed solids are charged, a pressure sensor that measures the pressure in the container, a temperature sensor that measures the temperature in the container, and a boiler 50 that will be described later.
  • a steam valve connected to control the supply of steam into the container, a pressure control valve 31 for controlling the pressure in the container, and the pressure control valve 31 and the steam valve to control the interior of the container. And a controller that controls the temperature and the predetermined pressure.
  • the opening degree of the pressure control valve 31 is controlled in order to maintain the atmospheric pressure in the heat solubilization reactor 30 and to reduce the pressure.
  • the predetermined pressure is 0.2 MPa to 1.0 MPa, preferably 0.5 MPa to 0.8 MPa
  • the predetermined temperature is 120 ° C. to 180 ° C., preferably 150 ° C. to 170 ° C.
  • the control unit opens and closes the steam valve and the pressure control valve 31 to obtain the above-mentioned predetermined pressure and predetermined temperature.
  • the crushed solid matter put into the container of the solubilization reactor 30 is heat-solubilized by hydrolysis.
  • the anaerobic digestion tank 40 is a tank for performing anaerobic digestion treatment of heat-solubilized organic waste, a digestion gas recovery device for recovering digestion gas generated by the anaerobic digestion process, and anaerobic An agitation device 48 is provided for agitating and mixing the organic waste already in the digestion tank 40 and the newly added high-temperature heat-solubilized organic waste.
  • the temperature distribution of the organic waste in the digestion tank that is the organic waste in the anaerobic digestion tank 40 can be made uniform by the stirring device 48 arranged in the container of the anaerobic digestion tank 40.
  • the anaerobic digester 40 is a pH meter that measures the pH value of the organic waste in the digester, and a pH at which an alkaline substance as a pH adjuster can be injected into the anaerobic digester 40. And a regulator.
  • the pH value of the organic waste in the digestion tank can be monitored by the pH meter, and the pH value of the organic waste in the digestion tank can be adjusted by the pH adjuster.
  • the stirring device 48 disposed in the anaerobic digestion tank 40 has a cylindrical shape, here a cylindrical shape, and a draft tube 42 disposed around the central portion of the anaerobic digestion tank 40, and a driving device (illustrated). And a stirring blade 41 disposed inside the draft tube 42.
  • this stirring device 48 equipped with a stirring blade with a draft tube the stirring blade 41 stirs the organic waste in the digestion tank, so that the inside of the draft tube 42 moves from one upper side to the other lower side. While a downward flow that is a flow is formed, and an upward flow that is a flow from the lower side to the upper side is formed outside (or around) the draft tube 42 in the anaerobic digester 40, the stirring device 48.
  • the organic waste in the digestion tank is agitated in the entire anaerobic digestion tank 40, and the organic waste in the digestion tank flows, and the uniform temperature distribution of the organic waste in the digestion tank is promoted.
  • the anaerobic digestion tank 40 includes a thermometer for measuring the temperature of the organic waste in the digestion tank, and the heat-solubilized organic so that the organic waste in the digestion tank has a predetermined temperature. The input of radioactive waste is controlled. Then, the high-temperature heat-solubilized organic waste discharged from the heat-solubilization reactor 30 is introduced into the stirrer 48 or in the vicinity thereof in the anaerobic digester 40. Thereby, since the organic waste of the anaerobic digestion tank 40 and the heat-solubilized organic waste supplied as a heat source can be stirred and mixed, the organic waste in the anaerobic digestion tank 40 can be mixed. The temperature uniformity is promoted.
  • the high-temperature heat-solubilized organic waste discharged from the heat-solubilization reactor 30 is introduced into the draft tube 42 or toward the inside of the draft tube 42, and more specifically, the stirring blade 41. , Or at a position overlapping the stirring blade 41 when viewed from above and below. According to this, since the vicinity of the stirring blade 41 or the overlapping position is a portion where the flow generated by the stirring of the stirring blade 41 is fast, the heat of the heat-solubilized organic waste is transferred to the organic waste in the digestion tank. More efficiently.
  • the anaerobic digestion tank 40 is provided with the control part, and the following processes which are anaerobic digestion processes are performed.
  • the anaerobic digestion treatment may be performed by dividing the two steps of the acid fermentation step and the methane fermentation step into two tanks, or when the two steps are performed in a single anaerobic digestion tank.
  • the case where the said 2 process is performed in a single anaerobic digester is demonstrated.
  • the said control part is first organic in the anaerobic digestion tank 40. Maintain the waste (organic waste in the digester) at a temperature of 35-38 ° C, or 50-56 ° C, and a residence time of 7-30 days so that the pH value is 6.5-8.5. drive.
  • the temperature of the organic waste in the digestion tank is lower than the predetermined temperature, the temperature of the organic waste in the digestion tank is raised by introducing the heat-solubilized organic waste.
  • the processing speed of the methane fermentation treatment is about twice as high as when the temperature is 35 to 38 ° C.
  • the boiler 50 generates high-temperature steam to be supplied into the heat solubilization reactor 30, but is not particularly limited in the present invention.
  • the boiler 50 uses digestion gas generated in the anaerobic digester 40 as fuel.
  • digestion gas that is not supplied to the boiler 50 is supplied and stored in the gas holder 100 and is supplied to and used by other equipment that uses the digestion gas.
  • the second dehydration apparatus 60 is an apparatus for dehydrating the anaerobically digested organic waste in the anaerobic digestion tank 40 and has the same configuration as the first dehydration apparatus 10.
  • the anaerobic digestion processing method using the anaerobic digestion processing apparatus 1a includes the first dehydration process as the pre-digestion dehydration process, the crushing process, the heat solubilization process, the anaerobic digestion process, and the post-digestion dehydration process. It consists of a 2nd dehydration process.
  • the first dehydration step is a step in which the organic waste to be treated that has been transported to the anaerobic digestion treatment apparatus 1a is input to the first dehydration treatment apparatus 10 to dehydrate the organic waste, and the solid content concentration is A dehydrated solid of 10-30 wt% (wt / wt) can be recovered.
  • the crushing step is a step of crushing the dehydrated solid using the crushing device 20. According to this step, the dehydrated solid can be made into a small crushed solid having a predetermined size or less.
  • the heat solubilization reactor 30 in which the pressure is controlled to 0.2 MPa to 1.0 MPa, preferably 0.5 MPa to 0.8 MPa, and the temperature is controlled to 120 ° C. to 180 ° C., preferably 150 ° C. to 170 ° C.
  • This is a step of continuously supplying solid sludge.
  • heat-solubilized organic waste for example, heat-solubilized sludge
  • organic waste for example, sludge
  • the heat-solubilization reactor 30 when discharging the heat-solubilized organic waste heat-solubilized in the heat-solubilization reactor 30, in order to control the temperature in the heat-solubilization reactor 30 to a predetermined temperature, the heat-solubilization reactor The hot steam in 30 is retained, and the amount of steam supplied to the heat solubilization reactor 30 is controlled according to the amount of crushed solids supplied and the temperature in the heat solubilization reactor 30.
  • An anaerobic digestion process consists of two processes, an acid fermentation process and a methane fermentation process. As described above, in this embodiment, the two processes of the acid fermentation process and the methane fermentation process included in the anaerobic digestion process are performed in parallel in the single anaerobic digestion tank 40, so that heat solubilization is performed. Organic waste is supplied into the anaerobic digestion tank 40, and the organic waste in the digestion tank in the anaerobic digestion tank 40 has a temperature of 35 to 38 ° C, or 50 to 56 ° C, and a pH value of 6.5.
  • the residence time By maintaining the residence time at 7 to 30 days so as to be ⁇ 8.5, acid-producing bacteria and methanogenic bacteria can be grown in the anaerobic digestion tank 40 and the grown state can be maintained. Then, the acid-fermented organic waste undergoes methane fermentation to generate carbon dioxide and digestion gas, thereby reducing the solid content.
  • the digestion gas generated by the anaerobic digestion is recovered by the digestion gas recovery device provided in the anaerobic digestion tank 40 and supplied to the boiler 50 or the gas holder 100.
  • the digested organic waste which is digested organic waste in the anaerobic digestion tank 40, is subjected to moisture (dehydrated filtrate) and solids (dehydrated sludge) by the second dehydration treatment device 60.
  • Cake The dehydrated sludge cake is dried by a drying device and incinerated, or it is carried out of the anaerobic digester 1a and composted or landfilled.
  • the dehydrated filtrate that has been dehydrated is returned to, for example, an activated sludge treatment plant of a water treatment system that performs activated sludge treatment.
  • the crushed solid material crushed to the predetermined size by the crushing apparatus 20 is obtained. Therefore, crushing solid matter supplied to the heat solubilization reactor 30 is prevented or suppressed from clogging the pressure control valve 31 provided in the heat solubilization reactor 30. Therefore, in the anaerobic digestion processing method 1a using the anaerobic digestion processing apparatus 1a and the anaerobic digestion processing apparatus 1a of the first embodiment, in the thermal solubilization process, continuous thermal solubilization while retaining high-temperature steam.
  • the heat-solubilizing reactor 30 to be processed can be used, and the continuous heat-solubilizing treatment can be performed while high-temperature steam is retained in the heat-solubilizing reactor 30.
  • the anaerobic digestion processing apparatus 1a and the anaerobic digestion processing apparatus 1a of the first embodiment perform the heat solubilization process while retaining hot steam
  • the conventional heat solubilization process is performed.
  • the heat-solubilized organic waste is intermittently discharged, and almost all the steam in the heat-solubilization reactor is discharged at the same time as the heat-solubilization organic waste is discharged. It is not necessary to supply high-temperature steam into the heat-solubilization reactor 30 after embedding the organic waste to be heat-solubilized, and the enormous amount of heat energy that has been conventionally consumed can be reduced and the heat efficiency can be improved.
  • no heat exchanger is used in the heat solubilization process, organic waste does not scorch the surface of the heat exchanger, eliminating the need for scale removal and facilitating maintenance.
  • the generation rate of digestion gas is increased (for example, the conventional method does not include the crushing step and the heat solubilization treatment step).
  • the amount of dehydrated sludge cake generated can be reduced (for example, about 50 to 60% of the prior art).
  • the high-temperature heat-solubilized organic waste in the heat-solubilization reactor 30 is used as a heat source for heating the organic waste in the anaerobic-digestion tank 40, conventionally, the anaerobic digestion tank 40 is used. This eliminates the need for a heat exchanger installed inside or outside the hood and reduces the heat energy used for heating by the heat exchanger.
  • the anaerobic digestion processing apparatus of this invention is not restricted to the anaerobic digestion processing apparatus 1a shown in 1st Embodiment.
  • the anaerobic digestion treatment apparatus 1a includes an anaerobic digestion tank 40 that performs an acid fermentation process and a methane fermentation process, which are anaerobic digestion processes of heat-solubilized sludge.
  • the first embodiment shown in FIG. As in the anaerobic digestion treatment apparatus 1b which is a modified example of the above, the storage tank 35 for performing acid fermentation and the anaerobic digestion tank 40b for performing methane fermentation may be separately provided.
  • the storage tank 35 includes a control unit, a pH measuring device, a pH adjuster, a thermometer, and a stirring device 38, and the control unit supplies organic waste in the storage tank 35.
  • control is performed so that high-temperature heat-solubilized organic waste is introduced.
  • the heat-solubilized organic waste can be used as a heat source for heating the organic waste in the storage tank to a temperature suitable for acid fermentation treatment in anaerobic digestion treatment, Heat energy can be reduced. And it can control to the conditions suitable for each process of an acid fermentation process and a methane fermentation process, and an efficient anaerobic digestion process is attained.
  • the anaerobic digester 40b may require a heat exchanger or the like for setting the temperature of the organic waste in the digester to a predetermined temperature.
  • the storage tank stirring device disposed in the storage tank 35 may be a stirring blade alone or a stirring blade with a draft tube. Then, the high-temperature heat-solubilized organic waste discharged from the heat-solubilization reactor 30 is introduced into the storage tank 35 or in the vicinity thereof in the storage tank 35, and more specifically, the stirring apparatus 48. It is thrown into the storage tank agitator in the same form as for the storage tank.
  • the stirrer 38 in the case of a stirring blade with a draft tube corresponds to the stirrer 48 and has a cylindrical shape, here a cylindrical shape, and is disposed around the central portion of the storage tank 35 and is a storage tank draft tube 37.
  • a storage tank agitating blade 36 that is rotationally driven by a driving device (not shown) and disposed inside the draft tube 37.
  • the organic waste in the storage tank 35 can be caused to generate a flow similar to the flow of the organic waste in the anaerobic digestion tank 40 of the first embodiment.
  • the uniform temperature distribution of the organic waste in the tank 35 is promoted.
  • the storage tank 35 is equipped with the thermometer which measures the temperature of the organic waste in a storage tank, and heat solubilized organic disposal is carried out so that the organic waste in a storage tank may become predetermined
  • the input of goods is controlled.
  • the high-temperature heat-solubilized organic waste discharged from the heat-solubilization reactor 30 is introduced into the interior of the draft tube 37 or toward the interior of the draft tube 37 in the storage tank 35, and more specifically. Is introduced in the vicinity of the stirring blade 36 or at a position overlapping with the stirring blade 36 when viewed from above and below. According to this, since the vicinity of the stirring blade 36 or the overlapping position is a portion where the flow generated by the stirring of the stirring blade 36 is fast, the heat of the heat-solubilized organic waste is transferred to the organic waste in the storage tank. More efficiently.
  • the heat-solubilized organic waste is supplied to the storage tank 35 serving as an acid fermentation tank, and the control unit included in the storage tank 35 is configured to store the organic waste in the storage tank 35 (organic waste in the storage tank).
  • the residence time is maintained for 1-2 days such that the temperature is 35-38 ° C. or 50-56 ° C. and the pH value is 5-7.
  • the organic waste that has been subjected to acid fermentation is supplied to the anaerobic digester 40b serving as the methane fermenter, and the controller included in the anaerobic digester 40b is an organic substance in the anaerobic digester 40b.
  • the residence time is maintained for 5-30 days so that the temperature is 35-38 ° C. or 50-56 ° C. and the pH value is 6.5-8.5.
  • the heat-solubilized organic waste is retained for 6 to 7 days or more, thereby anaerobic.
  • acid-producing bacteria and methanogenic bacteria can be grown and maintained in a grown state. Then, the acid-fermented organic waste undergoes methane fermentation to generate carbon dioxide and digestion gas, thereby reducing the solid content.
  • the anaerobic digestion processing apparatus 1c in 2nd Embodiment is demonstrated.
  • the anaerobic digestion processing device 1 c further includes a circulation line 70 and a flocculant addition device 80 in addition to the configuration of the anaerobic digestion processing device 1 a described in the first embodiment.
  • the stirring device 49 of the anaerobic digestion tank 40 of the anaerobic digestion processing apparatus 1 c includes a draft tube 42 and a digestion gas circulation tube 41 a instead of the stirring blade 41 of the stirring device 48.
  • the configuration of the circulation line 70, the flocculant addition device 80, and the digestion gas circulation pipe 41a will be described.
  • the circulation line 70 is a pipeline for circulating a part of the organic waste in the digestion tank that has been anaerobically digested in the anaerobic digestion tank 40 into the anaerobic digestion tank 40 again.
  • the circulation line 70 is provided with a circulation pump 71, which is combined with the heat-solubilized organic waste and circulated in the anaerobic digester 40.
  • the flocculant adding device 80 is a post-digestion organic waste that has been anaerobically digested in the anaerobic digestion tank 40, and the flocculant is added to the post-digestion organic waste to be dehydrated by the second dehydration treatment device 60. It is an apparatus for adding.
  • the flocculant includes a polymer flocculant or an inorganic flocculant and a polymer flocculant.
  • the polymer flocculant include anionic polyacrylamide, cationic DAM, DAA, and amidine.
  • examples of the inorganic flocculant include polyaluminum chloride as an aluminum inorganic flocculant, and ferric chloride and polyferric sulfate as iron-based inorganic materials.
  • the digestion gas circulation pipe 41 a is a discharge pipe that discharges reflux digestion gas, which is a part of digestion gas generated and collected in the anaerobic digestion tank 40, into the draft tube 42 in the anaerobic digestion tank 40.
  • the outlet of the reflux digestion gas in the digestion gas circulation pipe 41 a is disposed at the lower part of the anaerobic digestion tank 40 and inside or below the draft tube 42.
  • this digestion gas circulation pipe 41a the digestion gas flowing out from the digestion gas circulation pipe 41a pushes away the organic waste in the digestion tank in the anaerobic digestion tank 40, and in the inside of the draft tube 42, In the anaerobic digestion tank 40, a downward flow is formed from the upper side to the lower side in the anaerobic digestion tank 40.
  • the organic waste in the digestion tank is agitated in the entire digestive digestion tank 40, and the organic waste in the digestion tank flows, and the organic waste and the heat-solubilized sludge are mixed together in the digestion tank. Uniform temperature distribution of organic waste
  • the anaerobic digestion processing method of the second embodiment is characterized in that it has a circulation step of circulating the organic waste in the digestion tank in the anaerobic digestion step, and a coagulant addition step. Is different. After passing through this circulation step and the flocculant addition step, the second dehydration step is performed.
  • the flocculant addition step is a step of adding the polymer flocculant or the inorganic flocculant and the polymer flocculant to the organic waste after digestion carried out by the anaerobic digester 40 by the flocculant addition device 80. It is. According to the said process, the particle
  • the organic waste after digestion anaerobically digested by the circulation line 70 is anaerobic.
  • the organic waste is repeatedly anaerobically digested.
  • the organic waste in the anaerobic digestion tank 40 can be uniformly stirred and mixed, and the solid content of the organic waste can be further reduced. Further, by adding a polymer flocculant or an inorganic flocculant and a polymer flocculant, flocs are formed in the organic waste.
  • the formed floc is separated from the dehydrated filtrate together with the dehydrated sludge cake as a solid content from the dehydration process by the second dehydration apparatus 60, and suspension of the dehydrated filtrate can be prevented.
  • the organic waste after digestion is put into the anaerobic digestion tank 40 via the circulation line 70.
  • the circulation line 70 may be provided not to be circulated in the anaerobic digestion tank 40 but to the first dehydration processing apparatus 10.
  • this anaerobic digestion processing apparatus 1d a part of the organic waste after digestion is circulated to the first dehydration processing apparatus 10 via the circulation line 70, and the crushing apparatus 20 and the heat solubilization reactor 30 are connected. Then, it is supplied into the anaerobic digester 40. Therefore, if it is the anaerobic digestion processing method using the anaerobic digestion processing apparatus 1d and the anaerobic digestion processing apparatus 1d, a part of the organic waste subjected to the dehydration process, the crushing process, and the heat solubilization process again is anaerobic.
  • the flocculant adding device 80 is incorporated in the circulation line 70, and the circulation line is downstream of the flocculant adding device 80. It is also possible to branch 70. Thereby, the organic waste to which the flocculant is added is supplied to the anaerobic digester 40.
  • the anaerobic digestion processing apparatus 1e in 3rd Embodiment includes a coagulation filtration membrane apparatus 90 and a filter in addition to the configuration provided in the anaerobic digestion treatment apparatus 1a to the anaerobic digestion treatment apparatus 1d described above.
  • the liquid circulation line 110 is further provided, and the organic waste to be treated is different from the organic waste to be treated supplied to the heat solubilization reactor 30 (hereinafter referred to as “second organic waste to be treated for convenience”). It is different in that it is called “thing”) into the storage tank 35. Only the differences will be described below.
  • the second processing target organic waste first input to the storage tank 35 in the anaerobic digestion processing apparatus 1e and the high-temperature heat-solubilized organic waste discharged from the heat-solubilization reactor 30 Is put in the storage tank 35 in the vicinity of the stirring blade 36 or at a position overlapping with the stirring blade 36 when viewed from above and below.
  • the heat of the heat-solubilized organic waste can be more efficiently transferred to the processing target organic waste and the organic waste in the storage tank.
  • the agglomeration filtration membrane device 90 is a device for removing flocs, chromaticity components and COD components generated by adding a flocculant to the dehydrated filtrate generated from the second dehydration treatment device 60 by the flocculant addition device 80. is there.
  • the aggregation filtration membrane used here an MF (Micro Filtration) membrane, a UF (Ultra Filtration) membrane, or an NF (Nano Filtration) membrane is used depending on the object to be removed.
  • the filtrate circulation line 110 is a line which circulates the unfiltered concentrated liquid containing a floc to a dehydration processing apparatus. According to this, flocs, chromaticity components and COD components contained in the unfiltered concentrated liquid can be removed by dehydrating together with organic waste after digestion.
  • the second processing target organic waste is anaerobically digested. Specifically, as shown in FIG. 5, the second processing target organic waste is supplied into the storage tank 35 and first subjected to acid fermentation. Then, the organic waste that has been subjected to acid fermentation is supplied into the anaerobic digester 40b and subjected to methane fermentation.
  • the dehydrated filtrate discharged through the second dehydration process by the second dehydration processing device 60 is added with a polymer flocculant as a predetermined flocculant by the flocculant adding device 80 or is iron-based.
  • a polymer flocculant as a predetermined flocculant by the flocculant adding device 80 or is iron-based.
  • an aluminum-based inorganic flocculant and a polymer flocculant can be added, and then filtered by the flocculent filtration membrane device 90 to separate the floc, chromaticity component and COD component in the dehydrated filtrate.
  • the unfiltered concentrated liquid containing floc discharged from the aggregation filtration membrane device 90 is circulated to the second dehydration processing device 60 via the filtrate circulation line 110 and dehydrated.
  • the first dehydration treatment apparatus 10 is not dehydrated, and the heat solubilization reactor 30 is heat solubilized.
  • the 2nd process target organic waste which is not processed is first supplied to storage tank 35, an acid fermentation process is performed, and is then supplied to anaerobic digestion tank 40b, and anaerobic digestion processing is carried out.
  • the post-digestion organic waste discharged from the anaerobic digestion tank 40b is transported to the first dehydration processing apparatus 10 as a processing target organic waste to be heat-solubilized, dehydrated, and then to the crushing apparatus 20.
  • the heat-solubilization reactor 30 After being supplied and crushed, it is heat-solubilized in the heat-solubilization reactor 30. Therefore, volume reduction of the solid content of the organic waste conveyed to the 1st dehydration processing apparatus 10 and the crushing apparatus 20 is achieved, and size reduction of the 1st dehydration processing apparatus 10 and the crushing apparatus 20 is attained. Furthermore, since the load of the heat solubilization reactor 30 is reduced, the heat solubilization reactor 30 can be downsized. Moreover, according to the anaerobic digestion processing apparatus 1e, since the filtrate circulation line 110 is provided, the floc that could not be separated by the coagulation filtration membrane apparatus 90 was conveyed from the anaerobic digestion tank 40 by the second dehydration processing apparatus 60. It becomes possible to separate from the dehydrated filtrate together with the solid content of the organic waste after digestion.
  • the high-temperature heat-solubilized organic waste discharged from the heat-solubilization reactor 30 is stored in the methane fermentation process. It is good also as a heat source for supplying the organic waste in the anaerobic digestion tank 40b directly to the temperature suitable for methane fermentation, without supplying to the tank 35, supplying directly in the anaerobic digestion tank 40b.
  • This anaerobic digestion treatment apparatus 1f is suitable when the organic waste newly supplied to the storage tank 35 does not need to be heated with the heat of the organic waste treated in the heat solubilization reactor.
  • differences from the anaerobic digestion processing apparatus 1e will be described.
  • the second processing target organic waste is first supplied into the storage tank 35 and subjected to acid fermentation.
  • the organic waste subjected to acid fermentation treatment is supplied into the anaerobic digestion tank 40b and subjected to methane fermentation treatment.
  • the anaerobic digestion process supplies the anaerobic digestion tank 40b and circulates through the anaerobic digestion tank 40b, the first dehydration apparatus 10, the crushing apparatus 20, and the heat solubilization reactor 30.
  • the amount of heat of the organic waste heat-solubilized in the heat-solubilization reactor 30 is stored in the storage tank 35. Since it is utilized for the heating of the organic waste in the anaerobic digestion tank 40b without being utilized, temperature control in the anaerobic digestion tank 40b becomes easy. Further, in heating the organic waste necessary for methane fermentation in the anaerobic digester 40b, high-temperature heat-solubilized organic waste is directly supplied into the anaerobic digester 40b as a heat source. A heat exchanger inside or outside the digestion tank 40b is not necessary, and the heat energy to be used can be reduced.
  • the 2nd process target organic waste is first supplied to the storage tank 35, and an acid fermentation process is performed, Then, it supplies to the anaerobic digestion tank 40b, anaerobic digestion process, the anaerobic digestion tank 40b,
  • the storage tank 35 in 3rd Embodiment is provided with the stirring blade 36 as the stirring apparatus 39 for storage tanks.
  • the 2nd process target organic waste supplied in the storage tank 35 and the sludge in a storage tank can be stirred, and acid fermentation is accelerated
  • the organic waste supplied to the storage tank 35 may be supplied to the storage tank 35 after being roughly crushed by a crushing device such as a crushing pump.
  • each of the anaerobic digestion treatment apparatuses 1a to 1d see FIGS. 1 to 4
  • all of the organic waste to be treated has been heat-solubilized, but in each embodiment and modification, the organic waste to be treated is treated. Is heat-solubilized as an organic waste requiring heat solubilization, and the organic waste to be treated is different from the heat solubilized organic waste requiring non-heat-solubilized organic
  • waste for example, indicated by a two-dot chain line arrow in FIGS. 1 to 4
  • waste may be directly input to the digestion tank 40 or the storage tank 35.
  • the non-heat-solubilized organic waste is an organic waste whose decomposition rate only by an anaerobic digestion process is not less than a predetermined value (for example, 80%) without performing a heat-solubilization process. It is an organic waste having a higher decomposition rate than that of the heat-solubilized organic waste. And this non-heat-solubilized organic waste includes, for example, sewage initial sludge and garbage.
  • non-heat-solubilized organic waste that does not require heat-solubilization treatment is directly fed into the digestion tank 40 or the storage tank 35, so that the decomposition rate of the anaerobic digestion treatment alone is high.
  • Non-heat-solubilized organic waste that does not require solubilization is directly fed into the anaerobic digesters 40, 40b without being fed into the heat-solubilization reactor 30, so that non-heat-solubilized organic waste is discarded.
  • the amount of heat-solubilized organic waste that requires heat solubilization treatment can be increased by the amount of heat solubilization treatment of substances, and anaerobic while suppressing the reduction of digestion gas recovery rate
  • the processing capacity of the digestion process can be increased.
  • each of the anaerobic digestion treatment apparatuses 1a to 1e part or all of the organic waste to be treated is obtained by organic waste from other treatment plants or other anaerobic digestion treatment apparatuses. Organic waste that has been subjected to anaerobic digestion may also be used.
  • the first dehydration treatment apparatus may be omitted. In this case, organic waste that has already been dehydrated in other treatment plants or the like may be omitted. , May be supplied to a crushing device.
  • the stirring devices 38 and 39 may be devices that blow the gas phase gas in the storage tank into the liquid in the storage tank instead of the stirring blade 36.
  • the stirring device 38 as described above, the high-temperature heat-solubilized organic waste supplied from the heat-solubilization reactor 30 into the storage tank 35 is directed to the inside of the draft tube 37 or to the inside. Is inserted.
  • the storage tank 35 is provided with the stirring device 38 or the stirring device 39, and the anaerobic digestion tank 40 is stirred.
  • a device 48 or a stirring device 49 may be provided.
  • the anaerobic digestion tank 40 of the anaerobic digestion treatment apparatuses 1 c and 1 d may include a stirring device 48 instead of the stirring device 49.
  • the stirring device 38 or the stirring device 39 may include a digestion gas circulation pipe 41a as a gas tank gas circulation pipe in the storage tank in addition to the stirring blade 36, and similarly, the stirring apparatus 48.
  • a digestion gas circulation tube 41a may be provided.
  • the stirring device 48 may be configured by the stirring blade 41 or the stirring blade 41 and the digestion gas circulation pipe 41a without including the draft tube 42.
  • the high-temperature heat-solubilized organic waste discharged from the heat-solubilization reactor 30 is put into or in the vicinity of the stirrer 38, 39, 48, 49, thereby stirring.
  • the devices 38 and 39 or the stirring devices 48 and 49 the organic waste in the storage tank 35 or the anaerobic digestion tank 40 and the heat-solubilized organic waste supplied as a heat source can be stirred and mixed. Therefore, the temperature uniformity of the organic waste in the tanks 40 and 35 is promoted.
  • the storage tank and the anaerobic digestion tank are fixed in which a carrier to which the organism is fixed is installed in the tank even in a floating tank reactor in which the organism involved in each biological reaction survives in a floating state. Any of the bed reactors may be used.

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Organic Chemistry (AREA)
  • Zoology (AREA)
  • Wood Science & Technology (AREA)
  • Bioinformatics & Cheminformatics (AREA)
  • Water Supply & Treatment (AREA)
  • Molecular Biology (AREA)
  • Genetics & Genomics (AREA)
  • Sustainable Development (AREA)
  • General Health & Medical Sciences (AREA)
  • Microbiology (AREA)
  • Biomedical Technology (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Biotechnology (AREA)
  • Biochemistry (AREA)
  • General Engineering & Computer Science (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Mechanical Engineering (AREA)
  • Hydrology & Water Resources (AREA)
  • Environmental & Geological Engineering (AREA)
  • Processing Of Solid Wastes (AREA)
  • Treatment Of Sludge (AREA)
  • Separation Of Suspended Particles By Flocculating Agents (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)

Abstract

La présente invention concerne une méthode de traitement par digestion anaérobie et un appareil de traitement par digestion anaérobie dans lequel l'obstruction d'une vanne de régulation de pression par de la boue solubilisée thermiquement est empêchée ou minimisée et dans lequel on peut réaliser un traitement par solubilisation thermique de type continu. Cette méthode de traitement par digestion anaérobie comprend : une étape de déshydratation permettant d'effectuer un traitement de déshydratation et de récupérer les solides déshydratés ; une étape de broyage permettant de broyer les solides déshydratés à l'aide d'un dispositif de broyage (20) ; une étape de solubilisation thermique dans laquelle on envoie de la vapeur et les solides broyés dans un réacteur de solubilisation thermique (30) doté d'une vanne de régulation de pression (31) permettant d'ajuster la pression et on transforme les solides broyés en déchets organiques solubilisés thermiquement ; et une étape de digestion anaérobie permettant de soumettre les déchets organiques solubilisés thermiquement à une digestion anaérobie. Le dispositif de broyage (20) broie les solides déshydratés jusqu'à une taille plus petite que l'écart maximum entre un corps de vanne et un siège de vanne lorsque la vanne de régulation de pression (31) est complètement ouverte. Dans l'étape de solubilisation thermique, l'alimentation en solides broyés et la sortie des déchets organiques solubilisés thermiquement sont réalisées de façon à retenir la vapeur envoyée dans le réacteur de solubilisation thermique (30).
PCT/JP2011/078311 2010-12-24 2011-12-07 Méthode de traitement par digestion anaérobie et appareil de traitement par digestion anaérobie Ceased WO2012086416A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2010-288053 2010-12-24
JP2010288053A JP2012135705A (ja) 2010-12-24 2010-12-24 嫌気性消化処理方法、及び嫌気性消化処理装置

Publications (1)

Publication Number Publication Date
WO2012086416A1 true WO2012086416A1 (fr) 2012-06-28

Family

ID=46313696

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2011/078311 Ceased WO2012086416A1 (fr) 2010-12-24 2011-12-07 Méthode de traitement par digestion anaérobie et appareil de traitement par digestion anaérobie

Country Status (2)

Country Link
JP (1) JP2012135705A (fr)
WO (1) WO2012086416A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103436435A (zh) * 2013-08-30 2013-12-11 河南农业大学 一种农作物秸秆联合发酵装置
WO2024262080A1 (fr) * 2023-06-22 2024-12-26 三菱重工業株式会社 Système de traitement de déchets et procédé de fonctionnement dudit système de traitement de déchets

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5687962B2 (ja) * 2011-06-29 2015-03-25 三菱化工機株式会社 有機性廃棄物の処理方法および処理装置
JP5974385B2 (ja) * 2012-09-24 2016-08-23 三菱化工機株式会社 有機性汚泥の嫌気性可溶化消化処理システム、及び有機性汚泥の嫌気性可溶化消化処理方法
CN103586261B (zh) * 2013-11-25 2015-11-18 大连广嘉环保机械工程有限公司 餐饮、农副市场、水产品批发市场垃圾分类处理配套装置
DE102014013813A1 (de) 2014-09-23 2016-03-24 Bma Braunschweigische Maschinenbauanstalt Ag Verfahren und Anordnung zur Abwasserbehandlung
JP6026689B1 (ja) * 2016-03-24 2016-11-16 日本プライスマネジメント株式会社 メタン発酵システム
JP7130949B2 (ja) * 2017-12-08 2022-09-06 栗田工業株式会社 汚泥の脱水方法および汚泥脱水装置
JP7169067B2 (ja) * 2017-12-28 2022-11-10 株式会社東芝 水処理装置及び水処理方法
JP6755057B1 (ja) * 2019-11-01 2020-09-16 サステイナブルエネルギー開発株式会社 有機性廃棄物処理システム
JP6755058B1 (ja) * 2019-11-01 2020-09-16 サステイナブルエネルギー開発株式会社 有機性廃棄物処理システム
JP7542168B1 (ja) * 2023-07-19 2024-08-29 三菱化工機株式会社 可溶化装置、有機性廃棄物の処理システム及び処理方法

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11309438A (ja) * 1998-05-01 1999-11-09 Ataka Constr & Eng Co Ltd 廃棄物処理方法
JP2001000949A (ja) * 1999-06-21 2001-01-09 Mitsubishi Kakoki Kaisha Ltd 消化ガス貯蔵設備
JP2002018398A (ja) * 2000-07-07 2002-01-22 Shinryo Corp 生ごみを発酵槽を用いて減容化する装置及び方法
JP2003094022A (ja) * 2001-07-19 2003-04-02 Mitsubishi Heavy Ind Ltd 有機性廃棄物の処理方法及びその装置
JP2004008912A (ja) * 2002-06-06 2004-01-15 Hitachi Zosen Corp 有機性廃棄物の処理方法および処理装置
WO2006117934A1 (fr) * 2005-04-27 2006-11-09 Mitsubishi Kakoki Kaisha, Ltd. Équipement d’élimination des déchets organiques et procédé d’élimination
JP2007075807A (ja) * 2005-09-13 2007-03-29 Nobuaki Debari 有機物の連続再資源化装置及び排水処理装置
WO2008117096A2 (fr) * 2007-03-28 2008-10-02 Fövárosi Csatornázási Müvek Zrt. Procédé et appareil destinés à traiter des déchets contenant des substances organiques

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11309438A (ja) * 1998-05-01 1999-11-09 Ataka Constr & Eng Co Ltd 廃棄物処理方法
JP2001000949A (ja) * 1999-06-21 2001-01-09 Mitsubishi Kakoki Kaisha Ltd 消化ガス貯蔵設備
JP2002018398A (ja) * 2000-07-07 2002-01-22 Shinryo Corp 生ごみを発酵槽を用いて減容化する装置及び方法
JP2003094022A (ja) * 2001-07-19 2003-04-02 Mitsubishi Heavy Ind Ltd 有機性廃棄物の処理方法及びその装置
JP2004008912A (ja) * 2002-06-06 2004-01-15 Hitachi Zosen Corp 有機性廃棄物の処理方法および処理装置
WO2006117934A1 (fr) * 2005-04-27 2006-11-09 Mitsubishi Kakoki Kaisha, Ltd. Équipement d’élimination des déchets organiques et procédé d’élimination
JP2007075807A (ja) * 2005-09-13 2007-03-29 Nobuaki Debari 有機物の連続再資源化装置及び排水処理装置
WO2008117096A2 (fr) * 2007-03-28 2008-10-02 Fövárosi Csatornázási Müvek Zrt. Procédé et appareil destinés à traiter des déchets contenant des substances organiques

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103436435A (zh) * 2013-08-30 2013-12-11 河南农业大学 一种农作物秸秆联合发酵装置
WO2024262080A1 (fr) * 2023-06-22 2024-12-26 三菱重工業株式会社 Système de traitement de déchets et procédé de fonctionnement dudit système de traitement de déchets

Also Published As

Publication number Publication date
JP2012135705A (ja) 2012-07-19

Similar Documents

Publication Publication Date Title
WO2012086416A1 (fr) Méthode de traitement par digestion anaérobie et appareil de traitement par digestion anaérobie
US9771292B2 (en) Treatment of waste products with anaerobic digestion
EP3280685B1 (fr) Traitement de déchets par digestion anaérobie
JP5687929B2 (ja) 有機性廃棄物処理方法および有機性廃棄物処理装置
KR100787074B1 (ko) 유기성 폐기물의 바이오가스 생성장치
JP5726576B2 (ja) 有機性廃棄物の処理方法および処理装置
KR100972178B1 (ko) 유기성 폐기물의 혐기성 소화장치 및 방법
KR20060059919A (ko) 남은음식물류쓰레기의 혐기성자원화를 위한 밀링식 분쇄 및원심식 고액분리 연속처리공정구성과 탈리액의 효소반응을이용한 전처리공정의 설비구성 및 그 운영 방안.
KR102317178B1 (ko) 가축분뇨 및 음식물류 폐기물 처리시설 무방류 시스템
JP7254580B2 (ja) 有機性汚泥の処理方法及び処理装置
JPH11290827A (ja) 発酵槽内の有機性廃棄物の加温方法
JP2016203153A (ja) 有機性廃棄物からのメタン製造方法
KR20150114157A (ko) 음식물 쓰레기 탈리여액 처리시스템
JP2013086005A (ja) 有機性廃棄物の処理方法および処理装置
US20190322597A1 (en) Waste material processing system
KR20160098990A (ko) 가용효율이 높고 고농축처리가 가능한 음식물 쓰레기 탈리여액 처리시스템
KR101273088B1 (ko) 음식물 쓰레기 탈리여액 처리시스템
JP4945035B2 (ja) メタンガス生成システム
KR100663993B1 (ko) 음식물 쓰레기 자원화 과정의 폐수 처리방법
JP2011206667A (ja) 有機性廃水の処理方法及び処理装置
WO2007015098A1 (fr) Digestion anaerobie de dechets organiques
JP2000086214A (ja) リン回収方法
KR101979423B1 (ko) 고농도 유기성 폐수의 처리방법
KR20190089664A (ko) 고농도 유기성 폐수의 처리장치
JP2025056431A (ja) 希釈液添加システム

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 11850038

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 11850038

Country of ref document: EP

Kind code of ref document: A1