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WO2004096407A1 - Floculant pour traiter les eaux usees de lavage et equipement de traitement des eaux usees de lavage - Google Patents

Floculant pour traiter les eaux usees de lavage et equipement de traitement des eaux usees de lavage Download PDF

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Publication number
WO2004096407A1
WO2004096407A1 PCT/JP2003/005569 JP0305569W WO2004096407A1 WO 2004096407 A1 WO2004096407 A1 WO 2004096407A1 JP 0305569 W JP0305569 W JP 0305569W WO 2004096407 A1 WO2004096407 A1 WO 2004096407A1
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WO
WIPO (PCT)
Prior art keywords
coagulant
flocculant
wastewater treatment
section
water
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/JP2003/005569
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English (en)
Japanese (ja)
Inventor
Toyozo Hamada
Shuji Nakatsuka
Yasumitsu Miyazaki
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Daicel Corp
Daicen Membrane Systems Ltd
Original Assignee
Daicel Chemical Industries Ltd
Daicen Membrane Systems Ltd
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Priority to AU2003235823A priority Critical patent/AU2003235823A1/en
Priority to PCT/JP2003/005569 priority patent/WO2004096407A1/fr
Publication of WO2004096407A1 publication Critical patent/WO2004096407A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
    • C02F1/444—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D17/00—Separation of liquids, not provided for elsewhere, e.g. by thermal diffusion
    • B01D17/02—Separation of non-miscible liquids
    • B01D17/0202—Separation of non-miscible liquids by ab- or adsorption
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D17/00—Separation of liquids, not provided for elsewhere, e.g. by thermal diffusion
    • B01D17/02—Separation of non-miscible liquids
    • B01D17/0208—Separation of non-miscible liquids by sedimentation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D17/00—Separation of liquids, not provided for elsewhere, e.g. by thermal diffusion
    • B01D17/02—Separation of non-miscible liquids
    • B01D17/04—Breaking emulsions
    • B01D17/047—Breaking emulsions with separation aids
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D17/00—Separation of liquids, not provided for elsewhere, e.g. by thermal diffusion
    • B01D17/08—Thickening liquid suspensions by filtration
    • B01D17/085—Thickening liquid suspensions by filtration with membranes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D21/00—Separation of suspended solid particles from liquids by sedimentation
    • B01D21/0012—Settling tanks making use of filters, e.g. by floating layers of particulate material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D21/00—Separation of suspended solid particles from liquids by sedimentation
    • B01D21/01—Separation of suspended solid particles from liquids by sedimentation using flocculating agents
    • 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
    • B01D61/145—Ultrafiltration
    • 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
    • B01D61/147—Microfiltration
    • 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
    • B01D61/16—Feed pretreatment
    • 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
    • B01D61/18—Apparatus therefor
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F9/00—Multistage treatment of water, waste water or sewage
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2311/00—Details relating to membrane separation process operations and control
    • B01D2311/04—Specific process operations in the feed stream; Feed pretreatment
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/28—Treatment of water, waste water, or sewage by sorption
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/28—Treatment of water, waste water, or sewage by sorption
    • C02F1/283—Treatment of water, waste water, or sewage by sorption using coal, charred products, or inorganic mixtures containing them
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
    • C02F1/56—Macromolecular compounds
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/44—Nature of the water, waste water, sewage or sludge to be treated from vehicle washing facilities

Definitions

  • the present invention relates to a flocculant and a wastewater treatment apparatus suitable for treating wastewater containing wax, machine oil, surfactant, earth and sand, etc., generated by washing a car or machine.
  • Conventional technology a flocculant and a wastewater treatment apparatus suitable for treating wastewater containing wax, machine oil, surfactant, earth and sand, etc., generated by washing a car or machine.
  • Sand filtration is a method in which the suspension is filtered with sand and the filtered water containing oil is treated with activated carbon.However, it is difficult to completely remove oils of 1 m or less, and activated carbon is also used. The maintenance capacity is complicated because the adsorption capacity of the water is easily reduced at an early stage, and frequent regeneration processing is required. In the coagulation sedimentation treatment, it is necessary to change the amount of the coagulant to be added according to the fluctuation of the raw water composition, and it is difficult to perform a stable treatment. Furthermore, since the sand filtration method and the coagulation sedimentation method cannot remove pacteria, the treated water may have a putrefactive odor, making it difficult to reuse.
  • Ozone treatment has a bactericidal action and can solve the problem of bacteria, but has a problem that the amount of treatment is small and oil removal is difficult. In biodegradation, it is difficult to cope with fluctuations in the composition of raw water. However, there is a problem that it cannot be reused.
  • claim 1 of Japanese Patent Application Laid-Open No. 2000-127913 discloses a car washing system by filtration provided with a filter using a hollow fiber membrane, but without pretreatment. It is difficult to stably filter car wash drainage for a long period only with a filter using a hollow fiber membrane, and it is necessary to substantially combine electrolytic coagulation and a filter. However, in a car wash system that incorporates electrolytic coagulation, equipment costs and electricity consumption are large, and the treated water itself to be reused is expensive.
  • An object of the present invention is to provide a flocculant and a wastewater treatment device used for treating wastewater containing oil and a surfactant generated in various car washing places and the like and obtaining treated water that can be reused as washing water. And Disclosure of the invention
  • the present inventor has made it easy to operate and maintain the apparatus, to obtain long-term stable treatment capacity, to reduce the operation and maintenance costs, and to wash the treated water with water.
  • the coagulation of a combination of an organic coagulant and an inorganic coagulant, including a specific coagulant, will not cause any discomfort to the user or pollute the surrounding environment when reused as
  • the present invention has been accomplished by using an agent, and finding that the problem can be solved by combining a coagulation-sedimentation part using a coagulant with a membrane separation part.
  • the present invention provides a coagulant comprising a combination of 2 to 20% by mass of an organic coagulant and 80 to 98% by mass of an inorganic coagulant.
  • the present invention provides a coagulant for car wash wastewater treatment containing an oil component containing a ionic mineral as an inorganic coagulant and a surfactant.
  • the present invention provides, as a means for solving the above-mentioned other problems, an apparatus for treating washing wastewater containing an oil component and a surfactant, wherein the wastewater contains an organic coagulant and an inorganic coagulant containing an ionic mineral.
  • Separation unit, storing the treated water in the membrane separation unit Provided is a wastewater treatment device that is provided with a water storage section that can be reused as treated flush water for the water storage section.
  • the “water containing oil and surfactant” referred to in the invention relating to the above-mentioned wastewater treatment device refers to cleaning various vehicles, vehicles such as trains, machinery and buildings of various factories, etc. with washing water containing water.
  • Oil and surfactants vary depending on the object to be washed, for example, because they are wastewater that is generated at the time of washing. For example, car wax and machine oil are used, and surfactants include anions, cations, nonionics, and amphoteric interfaces. Activator.
  • the coagulant for car wash wastewater treatment of the present invention comprises a combination of an organic coagulant containing alginate and Z or a cationic high molecular coagulant, and an inorganic coagulant containing an ionic mineral and / or aluminum sulfate.
  • the coagulant preferably contains an alginate and a cationic polymer coagulant, and the inorganic coagulant preferably contains an ionic mineral and aluminum sulfate.
  • the content ratio of the organic flocculant and the inorganic flocculant is such that the organic flocculant ij is 2 to 20% by mass, preferably 4 to 14% by mass, more preferably 5 to 13% by mass. It is 98 to 20% by mass, preferably 96 to 86% by mass, and more preferably 95 to 87% by mass.
  • the effect of the flocculation treatment can be remarkably enhanced, so that special adjustment of the addition amount is not required, and the membrane separation treatment is performed after the flocculation treatment. In that case, the load is reduced, and the solid-liquid separation is performed as designed, which also contributes to eliminating the need for special adjustment of the addition amount of the flocculant.
  • Alginate used as an organic flocculant is preferably sodium alginate
  • cationic polymeric flocculants are polyamines, polydicyandiamides, cationized starch, cationic poly (meth) acrylamide, water-soluble aniline resin, polythiourea, polyethylene glycol. Examples thereof include min, quaternary ammonium salts, polyvinyl pyridines, and chitosan. Among them, cationized starch, cationic poly (meth) acrylamide, and a mixture thereof are preferable.
  • Content ratio (mass ratio indicated by alginate cationic polymer flocculant)
  • the ratio is preferably 1: 2 to 4: 1, and more preferably 1: 1.5 to: 10: 3.
  • ionic mineral used as the inorganic coagulant examples include clay minerals such as bentonite, kaolin, and montmorillonite, zeolite, and the like. Montmorillonite and bentonite are preferred because they are easy to use.
  • the content ratio is preferably 1: 2 to 2: 1, and 1: 1. 5 to 1.5: 1 is more preferable.
  • the organic coagulant include acrylic copolymers obtained by copolymerizing hydrophilic monomers such as (meth) acrylic acid and (meth) acrylamide, sodium salts of lipoxymethyl cellulose, and maleic acid.
  • Copolymers such as poly (meth) acrylamide, sodium ligninsulfonate, soluble starch, polyoxyethylene dipropylamine, polyoxyethylene lauryl ether, polyoxyethylene octylphenyl ether, etc., (meth) Anionic or nonionic polymer flocculants such as copolymers of acrylic acid and acrylamide, amphoteric polymer flocculants, and low molecular amine flocculants such as propylenediamine can be contained.
  • surfactants such as poly (meth) acrylamide, sodium ligninsulfonate, soluble starch, polyoxyethylene dipropylamine, polyoxyethylene lauryl ether, polyoxyethylene octylphenyl ether, etc.
  • Anionic or nonionic polymer flocculants such as copolymers of acrylic acid and acrylamide, amphoteric polymer flocculants, and low molecular amine flocculants such as propylenediamine
  • Inorganic coagulants other than the above include polyaluminum chloride, magnesium chloride, ferric chloride, ferrous sulfate, ferric sulfate, slaked lime, sodium silicate, sodium aluminate, aluminum alum, etc. Can be contained.
  • a coagulant for sodium alginate, a cationic polymer coagulant, montmorillonite, and aluminum sulfate and an organic and inorganic coagulant is used as a coagulant for car wash wastewater treatment of the present invention, Since each component has the following synergistic action, the water treatment capacity is improved.
  • the cationic polymer flocculant promotes the enlargement by the floc coupling effect, and at the same time, dehydrates the floc. The same effect is obtained by using bentonite instead of montmorillonite.
  • FIG. 1 is a conceptual diagram of a wastewater treatment device of the present invention.
  • FIG. 2 is a conceptual diagram of another wastewater treatment device of the present invention.
  • FIGS. 1 and 2 showing the concept of the wastewater treatment device of the present invention.
  • Fig. 1 shows a wastewater treatment system suitable for the internal pressure type dead-end filtration system
  • Fig. 2 shows a wastewater treatment system suitable for the cross-floor single filtration system.
  • the same numbers refer to the same ones.
  • the wastewater treatment apparatus of the present invention includes a coagulation settling section, a membrane separation section, and a water storage section, which are connected by a pipe or the like. However, it may include components necessary for treating wastewater not shown in FIG.
  • P indicates a pump
  • P1 to P4 indicate a pressure gauge
  • F1 and F2 indicate a flow meter
  • MV indicates a flow control valve
  • all on / off valves have the same display.
  • FIGS. 1 and 2 show each component, the connection state of each component, and the wastewater treatment flow, but do not show the arrangement of each component or the size of the entire apparatus.
  • the oil / water separation tank 20 is composed of a total of four sedimentation tanks as shown in the figure.
  • the suspended solid (SS) force of large particles such as gravel is settled in order, and the drainage water in the final sedimentation tank is pumped. Pump it up and send it to the raw water storage tank 1 for water storage. This will be the raw water for treatment.
  • a filter net composed of wire mesh or the like as shown in Fig. 2 can be installed in order to remove large foreign substances such as gravel.
  • the raw water in the raw water storage tank 1 is sent to the coagulation sedimentation section 2.
  • the wastewater may be sent directly from the oil / water separation tank 20 to the coagulation sedimentation section 2, or if the amount of wastewater is small and the amount of sand, mud, etc. is small, the oil / water separation tank 20 may be used. Alternatively, the wastewater may be sent directly to the coagulation sedimentation section 2.
  • a coagulant is added to the raw water to coagulate and settle some of the SS such as oil, surfactant, and mud, thereby reducing the load on the next membrane separation section 3 and pumps and valves. It also prevents the connecting pipe from being clogged.
  • the coagulation sedimentation section 2 is separated into three tanks, a first tank 24, a second tank 25, and a third tank 26, by the first partition wall 27 and the second partition wall 28. Have been. Then, a required amount of coagulant is added into the first tank 24 by the coagulant feeder 22. At this time, if the flocculant is liquid, the metering pump is operated, and if the flocculant is in powder form, the metering feeder (not shown) is operated to add the coagulant, but the operation and operation are simple. It is preferable to use a powdery flocculant because of its ease of maintenance.
  • a quantitative screw feeder that can prevent powder blocking and can easily adjust the supply amount. It is more preferable to use a quantitative screw feeder provided with a bridging prevention mechanism such as a screw agitator.
  • the flocculant is an ionic mineral that adsorbs and separates oil from one or more selected from organic flocculants to sediment the highly stabilized low-concentration oil and reduce the load on the membrane separation section. It is preferable to combine with one or more inorganic coagulants containing as an essential component.
  • inorganic coagulants known coagulants can be used, but the above-mentioned coagulants for car wash wastewater treatment are more preferable, and particularly, sodium alginate and high-molecular cationic coagulants are included as organic coagulants.
  • Preferred are those containing montmorillonite and aluminum sulfate as the inorganic coagulant.
  • the combination and order of addition of the organic flocculant and the inorganic flocculant are appropriately selected experimentally depending on the liquid to be treated.
  • An aqueous flocculant containing sodium alginate as the organic flocculant aqueous solution or aqueous dispersion
  • the filtration in the membrane separation section 3 is performed at a low pressure and a constant transmembrane pressure.
  • the filtration method in the membrane separation unit 3 can be any of an external pressure type cross-floor single filtration method, an external pressure type dead end filtration method, an internal pressure type cross flow filtration method and an internal pressure type dead end filtration method, but the filtration efficiency and uniformity In consideration of the washing property for recovering the membrane filtration performance, etc., the cross-flow filtration method is preferable, and among them, the internal pressure type cross-flow filtration method is the best.
  • the internal pressure type dead-end filtration method has the advantage that it can be operated with lower power and the equipment cost is lower than the cross-flow filtration method. Furthermore, by making the transmembrane pressure constant, there is an advantage that membrane fouling can be suppressed as compared with a constant flow (flux) operation in which the transmembrane pressure fluctuates.
  • the transmembrane pressure is 5 to 30 kPa, preferably 5 to Select from a low pressure range in the range of 25 kPa.
  • the power can be reduced, and a decrease in filtration efficiency due to loss of transmembrane pressure can be prevented. Further, since the fouling of the membrane is suppressed, the amount of treated water can be stably maintained over a long period of time. Filtration at such a low pressure makes it possible to reduce the average membrane surface linear velocity at the inlet and the outlet of the membrane in the internal pressure type mouth-to-mouth single-filtration system, preferably 0.1 lm / sec or less, more preferably 0.1 lm / sec. Operate at an average film surface linear velocity of 8 m / s or less.
  • the membrane used in the membrane separation unit 3 is preferably a hollow fiber membrane selected from cellulose acetate-based, polysulfone-based, and polyacrylonitrile-based ultrafiltration membranes.From the viewpoint of fouling resistance, the membrane is preferably a cellulose acetate-based membrane. Ultrafiltration membranes are more preferred. The molecular weight cut-off of this membrane is preferably 10,000 to 500,000, more preferably 100,000 to 300,000.
  • the treated water treated in the membrane separation unit 3 can be sent to the water storage tank 5 as it is, where it is stored and reused, but the activated carbon treatment unit 4 provided between the membrane separation unit 3 and the water storage tank 5 It is desirable to carry out feed activated carbon treatment to adsorb and remove odor components mainly caused by oil and the like and remaining surfactant.
  • the method of contacting the activated carbon with the treated water in the activated carbon treatment section 4 is not limited, and for example, a method of passing the treated water through an activated carbon filter can be applied.
  • the removal rate of oil, surfactant, SS, etc. can be synergistically increased by combining the coagulation sedimentation section 2 and the membrane separation section 3, so that the fluctuation of wastewater composition can be reduced. Accordingly, it is not necessary to adjust the addition amount of the coagulant.
  • the treated water treated in the activated carbon treatment section 4 is sent to the water storage section 5 for storage.
  • the water sent to the water storage unit 5 can be reused as washing water for car washing and the like. Providing the water storage section 5 in this manner facilitates the reuse of the treated water.
  • a back pressure cleaning tank 6 can be provided between the membrane separation section 3 and the activated carbon processing section 4.
  • the treated water subjected to the solid-liquid separation treatment in the membrane separation section 3 is stored in the back pressure washing tank 6, and is used as back pressure washing water.
  • wastewater containing oil and a surfactant is coagulated and settled.
  • the treatment is carried out in the order of the lower part 2, the membrane separation part 3, and possibly the activated carbon treatment part 4. If this treatment is continued, dirt adheres to the membrane surface of the membrane separation part 3, and the solid-liquid Separation performance may decrease. For this reason, it is desirable to maintain the solid-liquid separation performance in a stable state by performing back pressure washing at appropriate intervals.
  • the back pressure washing a method of injecting the treated water in the water storage unit 5 from the permeate side of the membrane separation unit 3 to the undiluted solution side can be applied.
  • the back pressure washing interval is preferably 15 to 60 minutes, more preferably 20 to 45 minutes.
  • the flow rate during back pressure washing is preferably from 2 to 20 mZday, and more preferably from 5 to 15 mZday.
  • a chemical solution such as sodium hypochlorite aqueous solution can be added from the chemical solution tank 30 to the cleaning water by operating a pump in order to enhance the washing effect.
  • sodium hypochlorite used, the amount of the chemical solution to be added is preferably such that the residual chlorine concentration after backwashing is in the range of 1 to 10 Omg ZL.
  • the wastewater treatment apparatus can be set so that the treatment amount can be automatically controlled in accordance with the inflow amount of the wastewater, and the water storage section can be set according to the amount of water used during the car washing operation so that the car washing operation can be performed smoothly. It can also be set so that the treated water of 5 can be automatically supplied.
  • the wastewater treatment device of the present invention can be adjusted in size from a size of a home washing machine or a refrigerator to a larger size according to the actual condition of the wastewater treatment site, and can be loaded on a car and moved. You can do it.
  • the flocculant and wastewater treatment apparatus for car wash wastewater treatment of the present invention since the flocculant treatment and the membrane separation treatment are combined, treated water having a high removal rate of not only oil and surfactants but also patellers can be obtained. It can be easily reused as washing water.
  • the synergistic treatment effect of the coagulant treatment and the membrane separation treatment it is not necessary to particularly adjust the amount of the coagulant added in accordance with the composition fluctuation of the wastewater.
  • the stirring tank is connected to the chemical tank and a stirrer is installed.
  • Organic flocculant 1 Haktron Z-123 (Hakutosha; natural aromatic compound)
  • Organic flocculant 2 Hakutron Z-A-320 (Hakutosha; copolymer of acrylic acid and acrylamide)
  • Organic coagulant 3 Himoloc S S-500 (manufactured by Himo Inc .; polyacrylamide)
  • Inorganic coagulant aluminum sulfate
  • a membrane module consisting of hollow fiber membranes of the materials shown in Table 1 (module membrane area 0.2 m 2 , molecular weight cutoff: 150,000 cellulose acetate, 150,000 polyethersulfone, 150,000 polyacrylonitrile) was maintained at 10 kPa.
  • a ram (diameter 15 cm ⁇ length 30 cm) filled with 1 kg of coconut shell activated carbon (CW130A, manufactured by Nimura Chemical Industry Co., Ltd.) was attached to the membrane permeate line.
  • CW130A coconut shell activated carbon
  • the measuring method in the examples and comparative examples is as follows.
  • the COD of the permeated liquid 24 hours after the start of operation was measured using a water quality analyzer made by HACH.
  • the wastewater from the final tank of the oil / water separation tank (having four tanks with the same structure as 20 in Fig. 1) that collects car wash wastewater at a gas station is treated as raw water (COD 98mg / L), and the wastewater treatment equipment shown in Fig. 1
  • the processing was performed using. Filtration was performed by an internal pressure type dead-end filtration method. Table 1 shows the results.
  • the treatment was performed using the wastewater treatment apparatus shown in FIG. However, using a mixed coagulant 4 containing 5% by mass of sodium alginate and 5% by mass of force thione-based polyacrylamide as an organic coagulant, and 45% by mass of bentonite and 45% by mass of aluminum sulfate as an inorganic coagulant, Coagulation sedimentation was performed.
  • the filtration was performed by an internal pressure type cross flow filtration method, and the filtration operation was performed at a low pressure and a constant pressure with a transmembrane pressure difference of 15 ⁇ 5 kPa at an average membrane surface linear velocity of 0.05 m / sec.
  • Organic flocculant 2 100 ⁇ ⁇ Cellulose acetate
  • Example 3 ⁇ ⁇ Mixed flocculant 3 700 Cellulose acetate
  • Example 7 Mixed Flocculant 1 100 Cellulose Acetate
  • Example 8 Mixed Flocculant 4 100 Hanging Cell Mouth Comparative Example 1
  • Organic Flocculant 2 700 Cellulose Acetate Comparative Example 2
  • Organic Flocculant 3 700 Acetate Cell 13-S Agent 1: Natural aromatic compound
  • Inorganic coagulant Aluminum sulfate Mixed coagulant 1: Monmo 'J
  • Organic coagulant 2 Copolymer of acrylic acid and acrylamide
  • Mixed coagulant 2 Sulfuric acid
  • Organic coagulant 3 Emulsion Acrylamide mixed flocculant 3: sulfuric acid
  • Example 1 the combined use of organic and inorganic coagulants significantly improved the processing speed and COD removal rate as compared to the organic coagulants of Comparative Examples 1 and 2 alone.
  • Examples 1, 5 and 6 do not have activated carbon treatment, but have a higher COD removal rate and a higher processing speed, and Example 1 has better results than Examples 5 and 6.
  • cellulose acetate was used as the hollow fiber membrane, the treatment effect was higher.
  • a comparison of Examples 1 to 3 using cellulose acetate as the hollow fiber membrane shows that the mixed coagulant containing an adsorbent clay mineral called montmorillonite-bentonite (Examples 1 and 3) is better.
  • montmorillonite-bentonite Examples 1 and 3
  • a mixed flocculant 1 (a mixture of sodium alginate and montmorillonite) consisting of an organic flocculant and an inorganic mineral flocculant as a flocculant in the flocculation settling section
  • a mixed flocculant 2 (a mixture of cationic polyacrylamide and (A mixture of aluminum sulfate) and cellulose acetate as the hollow fiber membrane

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Water Supply & Treatment (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Environmental & Geological Engineering (AREA)
  • Organic Chemistry (AREA)
  • Separation Of Suspended Particles By Flocculating Agents (AREA)

Abstract

L'invention porte sur un équipement de traitement des eaux usées permettant d'épurer les eaux usées provenant du lavage des voitures et de les réutiliser comme eau de lavage pour laver une voiture. L'équipement de traitement de l'eau usée de lavage contenant de l'huile et un tensioactif comprend une section effectuant la sédimentation par coagulation en ajoutant à l'eau usée un floculant comprenant une combinaison d'un floculant organique et d'un floculant inorganique contenant un minerai ionique ; une section de séparation de membrane effectuant la séparation solides/liquides de l'eau de traitement au niveau de la section de sédimentation par coagulation avec une différence de pression constante de la transmembrane dans une plage comprise entre 5 et 30 kPa, et une section pour stocker l'eau usée au niveau de la section de séparation à membrane, l'eau de traitement au niveau de la section de stockage e l'eau pouvant être réutilisée comme eau de lavage.
PCT/JP2003/005569 2003-05-01 2003-05-01 Floculant pour traiter les eaux usees de lavage et equipement de traitement des eaux usees de lavage Ceased WO2004096407A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AU2003235823A AU2003235823A1 (en) 2003-05-01 2003-05-01 Flocculant for treating cleaning wastewater and cleaning wastewater treatment equipment
PCT/JP2003/005569 WO2004096407A1 (fr) 2003-05-01 2003-05-01 Floculant pour traiter les eaux usees de lavage et equipement de traitement des eaux usees de lavage

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2003/005569 WO2004096407A1 (fr) 2003-05-01 2003-05-01 Floculant pour traiter les eaux usees de lavage et equipement de traitement des eaux usees de lavage

Publications (1)

Publication Number Publication Date
WO2004096407A1 true WO2004096407A1 (fr) 2004-11-11

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PCT/JP2003/005569 Ceased WO2004096407A1 (fr) 2003-05-01 2003-05-01 Floculant pour traiter les eaux usees de lavage et equipement de traitement des eaux usees de lavage

Country Status (2)

Country Link
AU (1) AU2003235823A1 (fr)
WO (1) WO2004096407A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006076446A3 (fr) * 2005-01-11 2006-12-07 3M Innovative Properties Co Traitement de courants d'eaux usees contenant des tensioactifs
WO2020021355A1 (fr) * 2018-06-20 2020-01-30 Hedson Technologies Ab Système et procédé de traitement d'eau pour un agencement de lavage de roues

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0235901A (ja) * 1988-07-25 1990-02-06 Nikko Eng Kk 排水処理剤及び排水処理方法並びにその装置
JPH0631270A (ja) * 1992-07-21 1994-02-08 Daicel Chem Ind Ltd 水の膜浄化方法及びその装置の運転方法
JPH07256071A (ja) * 1994-03-25 1995-10-09 Touyoubou Eng Kk 固液混合装置
JPH10305762A (ja) * 1997-05-06 1998-11-17 Nippon Yuka Kogyo Kk 洗車排液の処理方法および装置
JP2003093803A (ja) * 2001-09-27 2003-04-02 Daicel Chem Ind Ltd 含油排水処理方法
JP2003093807A (ja) * 2001-09-27 2003-04-02 Daicel Chem Ind Ltd 洗車排水の循環使用装置
JP2003093802A (ja) * 2001-09-27 2003-04-02 Daicel Chem Ind Ltd 排水処理装置及びその運転方法

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0235901A (ja) * 1988-07-25 1990-02-06 Nikko Eng Kk 排水処理剤及び排水処理方法並びにその装置
JPH0631270A (ja) * 1992-07-21 1994-02-08 Daicel Chem Ind Ltd 水の膜浄化方法及びその装置の運転方法
JPH07256071A (ja) * 1994-03-25 1995-10-09 Touyoubou Eng Kk 固液混合装置
JPH10305762A (ja) * 1997-05-06 1998-11-17 Nippon Yuka Kogyo Kk 洗車排液の処理方法および装置
JP2003093803A (ja) * 2001-09-27 2003-04-02 Daicel Chem Ind Ltd 含油排水処理方法
JP2003093807A (ja) * 2001-09-27 2003-04-02 Daicel Chem Ind Ltd 洗車排水の循環使用装置
JP2003093802A (ja) * 2001-09-27 2003-04-02 Daicel Chem Ind Ltd 排水処理装置及びその運転方法

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006076446A3 (fr) * 2005-01-11 2006-12-07 3M Innovative Properties Co Traitement de courants d'eaux usees contenant des tensioactifs
WO2020021355A1 (fr) * 2018-06-20 2020-01-30 Hedson Technologies Ab Système et procédé de traitement d'eau pour un agencement de lavage de roues
RU2757934C1 (ru) * 2018-06-20 2021-10-25 Хедсон Технологиес Аб Система обработки воды и способ для установки для мойки колес

Also Published As

Publication number Publication date
AU2003235823A8 (en) 2004-11-23
AU2003235823A1 (en) 2004-11-23

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