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EP2874956A1 - Traitement anaérobie des eaux usées avec dégazage et recyclage des boues, et installation de traitement - Google Patents

Traitement anaérobie des eaux usées avec dégazage et recyclage des boues, et installation de traitement

Info

Publication number
EP2874956A1
EP2874956A1 EP13734439.6A EP13734439A EP2874956A1 EP 2874956 A1 EP2874956 A1 EP 2874956A1 EP 13734439 A EP13734439 A EP 13734439A EP 2874956 A1 EP2874956 A1 EP 2874956A1
Authority
EP
European Patent Office
Prior art keywords
biosludge
wastewater
reactor vessel
waste water
discharged
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.)
Withdrawn
Application number
EP13734439.6A
Other languages
German (de)
English (en)
Inventor
Axel Gommel
Ronald Mulder
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.)
Voith Patent GmbH
Original Assignee
Voith Patent GmbH
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 Voith Patent GmbH filed Critical Voith Patent GmbH
Publication of EP2874956A1 publication Critical patent/EP2874956A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • C02F1/38—Treatment of water, waste water, or sewage by centrifugal separation
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/28—Anaerobic digestion processes
    • C02F3/2806—Anaerobic processes using solid supports for microorganisms
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/28—Anaerobic digestion processes
    • C02F3/2846—Anaerobic digestion processes using upflow anaerobic sludge blanket [UASB] reactors
    • 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 invention relates to a method for biological wastewater treatment by means of anaerobic microorganisms having biosludge, wherein the biosludge is located in a reactor vessel, the waste water is supplied below the biosludge, the biosludge flows through from bottom to top and is discharged above the biosludge.
  • the invention also relates to plants for biological, anaerobic wastewater treatment comprising a reactor vessel containing anaerobic microorganisms containing biosludge and at least one inlet for the wastewater to be cleaned in the lower part and at least one overflow for discharging the wastewater and at least one separator for separation in the upper part of the biogas produced in the wastewater treatment of the purified wastewater, in particular for carrying out the method.
  • wastewater treatment For wastewater treatment, a variety of mechanical, chemical and biological processes and corresponding reactors are known.
  • biological wastewater treatment the wastewater to be treated with aerobic or anaerobic microorganisms is contacted, which contains the organic impurities contained in the wastewater in the case of aerobic microorganisms predominantly to carbon dioxide, biomass and water and in the case of anaerobic microorganisms mainly to carbon dioxide and methane and only reduce a small part to biomass.
  • the biological wastewater treatment methods are increasingly carried out recently with anaerobic microorganisms, because in the anaerobic wastewater treatment not with high energy consumption oxygen in the bioreactor must be introduced when cleaning energy-rich biogas is generated, which can subsequently be used to generate energy, and significantly lower amounts of surplus sludge are generated.
  • the reactors for anaerobic wastewater treatment are divided into contact sludge reactors, UASB reactors, EGSB reactors, fixed bed reactors and fluidized bed reactors.
  • microorganisms in fixed bed reactors to stationary support materials and the microorganisms in fluidized bed reactors adhere to freely movable, small carrier material the microorganisms are used in the UASB and EGSB reactors in the form of so-called pellets.
  • UASB upflow anaerobic sludge blanket
  • EGSB expanded granular sludge bed
  • the wastewater or a mixture of wastewater to be purified and already purified wastewater from the outlet of the anaerobic reactor is fed to the reactor via an inlet in the lower reactor region and passed through a sludge bed containing microorganism pellets located above the feed.
  • the microorganisms When decomposing the organic compounds from the wastewater, the microorganisms form in particular methane and carbon dioxide-containing gas (which is also referred to as biogas), which partially accumulates in the form of small bubbles on the microorganism pellets and partly rises in the form of free gas bubbles in the reactor upwards. Due to the accumulated gas bubbles, the specific gravity of the pellets decreases, which is why the pellets in the reactor go up climb.
  • separators are usually arranged in the middle and / or upper part of the reactor, under the ridge of which biogas accumulates, which forms a gas cushion, including a flotation layer of microorganism pellets and wastewater is located.
  • Purified water freed of gas and microorganism pellets rises in the reactor and is withdrawn via overflows at the top of the reactor.
  • Such processes and corresponding reactors are described, for example, in EP 0 170 332 A and in EP 1 071 636 B.
  • the object of the invention is therefore to counteract the reduction of the degradation efficiency of the reactor as efficiently as possible.
  • the object was achieved with regard to the method in that discharged together with the wastewater from the reactor vessel Bioschlamnn degassed and at least partially returned to the reactor vessel.
  • the biosludge discharged with the waste water must be separated and degassed before it can be returned to the reactor vessel.
  • the degassing of the biosludge can take place before or during the separation of the same.
  • the shearing forces rupture layers which hinder the release of gas or even partially peeled off the biosludge.
  • the degassing of the biosludge can also be promoted if the biosludge discharged together with the wastewater is subjected to centrifugal forces for degassing. Shearing forces can also be generated by the centrifugal forces.
  • the shear or centrifugal forces should only be so great that, although the outer layers of the biosludge (pellets) are affected, but the pellets are not destroyed.
  • Gas obstruction is often due to gas bubbles within the pellets or under a skin or layer that forms around the pellets.
  • These layers or skins can be formed by polymers contained in the wastewater or by the bacteria themselves.
  • the so degassed pellets can easily with components detached therefrom on suitable and well-known facilities, such as sieves, or the like. retained and returned, for example via a low-shear pump back into the reactor vessel.
  • the degassing and separation of the biosludge can be done by means of a hydrocyclone.
  • the wastewater discharged from the reactor vessel is passed into the hydrocyclone and any resulting heavy particles are at least partially returned to the reactor vessel.
  • Hydrocyclones are well suited to concentrate heavy particles (biosludge) and light parts (wastewater) by centrifugal forces and to separate them separately via the outlet or the separator.
  • the hydrostatic pressure at the outlet of the reactor vessel can be utilized.
  • This type of degassing and separation also has the advantage that flocculent biosludge, which is not normally desired in the reactor, is passed as a lightweight part with the wastewater.
  • the inner diameter of the hydrocyclone should be greater than 20 cm, preferably greater than 25 cm.
  • the separation of the biosludge can also be carried out with the aid of a sieve, through which the effluent discharged from the reactor vessel is passed.
  • the shear forces created by the retention of the biosludge on the sieve can sometimes be sufficient for degassing.
  • the resulting rejects can be at least partially recycled to the reactor vessel without further treatment.
  • larger forces are required for the degassing of the biosludge, which is why the screen should be part of a sorter, in particular a pressure sorter.
  • a rotational flow is generated in the sorter on the inlet side of the screen via a rotor, which leads to the formation of appropriate centrifugal forces.
  • the wastewater passes through the screen, while the biosludge degassed due to the centrifugal and shear forces can be retained on the screen and returned to the reactor vessel.
  • the effluent from the reactor vessel wastewater for degassing the entrained biosludge can be passed through a centrifugal pump. Again, the rotational flow in the centrifugal pump leads to the formation of sufficiently high centrifugal forces without destroying the biosludge. The so degassed biosludge can then be separated in a subsequent treatment unit of the wastewater and at least partially recycled to the reactor vessel.
  • the following treatment unit for separating the biosludge can be formed by the sedimentation in which the biosludge settles.
  • the invention will be explained in more detail below with reference to two exemplary embodiments.
  • FIG. 1 shows a schematic cross section through a reactor vessel 3
  • Figure 2 a partial plant scheme for wastewater treatment
  • Figure 3 another system sub-scheme.
  • the bioreactor shown in Figure 1 comprises a reactor vessel 3, which is cylindrical in its middle and upper part and tapers in its lower part downwardly conically.
  • the inlet distribution system 4 for supplying the waste water 1 to be cleaned is housed.
  • separators 6 In the middle and upper reactor vessel 3 there are two separators 6. These separators 6 can each have multiple gas hoods or even multiple layers of gas hoods.
  • a gas separation device 14 is arranged, which is connected to the two separators 6 via the lines 13.
  • a sink line 12 leads from the bottom of the gas separation device 14 into the lower part of the reactor vessel 3.
  • a sediment discharge 15, 15 solids or a suspension of solid and liquid from the reactor vessel 3 can be withdrawn through the sediment discharge and via the inlet 4 liquid to Rinsing the lower reactor vessel part can be introduced.
  • the feed distribution system 4 is formed by a plurality of inlets 4, which are arranged uniformly at the bottom of the reactor vessel 3, here the inner wall of the funnel and lead to the wastewater to be purified 1 in the reactor vessel 3.
  • a high number of controllable feed lines 4 makes it possible to adjust the distribution of the supplied waste water 1 at the bottom of the reactor vessel 3.
  • the introduced wastewater 1 flows slowly from the feeds 4 in the reactor vessel 3 upwards until it enters the microorganism-containing biosludge 2.
  • the microorganisms contained in the biosludge 2 decompose the organic impurities contained in the waste water 1 mainly to methane and carbon dioxide gas.
  • the generated gases produce gas bubbles, the larger of which detach from the biosludge 2 and bubble in the form of gas bubbles through the medium, whereas small gas bubbles remain attached to the biosludge 2 (pellets).
  • the free gas bubbles catch in the gas hoods of the separator 6 and form a gas cushion.
  • the gas collected in the gas hoods as well as pellets and water from the flotation layer are optionally mixed with each other via a mixing chamber, not shown, and passed via line 13 into the gas separation device 14.
  • the remaining gas bubbles are collected in the upper separator 6 and fed via line 13 into the gas separation device 14.
  • the now purified wastewater 1 rises from the upper separator 6 further up until it is withdrawn through the overflows 5 from the reactor vessel 3 and discharged through a drain line.
  • the gas separation device 14 the gas separates from the remaining water and the microorganism pellets, wherein the suspension of pellets and the waste water 1 is recirculated via the sink line 12 into the reactor vessel 3.
  • the outlet opening of the sinking line 12 opens into the lower part of the reactor vessel 3, where the recycled suspension of pellets and waste water 1 with the, the reactor via the feeds 4 supplied wastewater 1 is mixed, after which the cycle begins again.
  • the calcareous sediment collecting at the top of the reactor vessel 3 can be withdrawn continuously or batchwise from the reactor as required.
  • hydrocyclone 7 offers the advantage that the admission pressure of the wastewater 1 can be used for generating the flow in the hydrocyclone 7.
  • the inner diameter of the hydrocyclone 7 should be greater than 20 cm.
  • the sorter 8 the centrifugal and shear forces are generated by a rotor, which is present on the inlet side of the most cylindrical screen. While the wastewater 1 passes through the sieve together with flocculent biosludge 2, the active biosludge 2 is retained on the sieve and can be cleared away from it by the rotor.
  • the degassing takes place simultaneously with the separation of the biosludge 2 from the effluent. 1 While the wastewater 1 can be further treated, the biosludge 2 is optionally returned via a low-shear pump 1 1 in the reactor vessel 3.
  • the degassed and thus relatively heavy biosludge 2 settles on the ground and can be returned from there by means of low-shear pump 1 1 to the reactor vessel 3.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Microbiology (AREA)
  • Chemical & Material Sciences (AREA)
  • Water Supply & Treatment (AREA)
  • Environmental & Geological Engineering (AREA)
  • Hydrology & Water Resources (AREA)
  • Organic Chemistry (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Analytical Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
  • Treatment Of Sludge (AREA)

Abstract

L'invention concerne un procédé ainsi que les installations correspondantes pour l'épuration biologique des eaux usées au moyen d'une boue biologique contenant des micro-organismes anaérobies, selon lequel la boue biologique (2) se trouve dans une cuve de réacteur (3), les eaux usées (1) sont introduites sous la boue biologique (2), et circulent à travers celle-ci de bas en haut, et sont évacuées au-dessus de la boue biologique (2). Afin d'éviter la diminution du pouvoir de dégradation, ce procédé comprend un dégazage de la boue biologique (2) évacuée de la cuve récipient de réacteur (3) simultanément aux eaux usées (1), et son recyclage au moins partiel dans la cuve de réacteur (3).
EP13734439.6A 2012-07-19 2013-07-09 Traitement anaérobie des eaux usées avec dégazage et recyclage des boues, et installation de traitement Withdrawn EP2874956A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE201210212675 DE102012212675A1 (de) 2012-07-19 2012-07-19 Abwasserbehandlung
PCT/EP2013/064437 WO2014012817A1 (fr) 2012-07-19 2013-07-09 Traitement anaérobie des eaux usées avec dégazage et recyclage des boues, et installation de traitement

Publications (1)

Publication Number Publication Date
EP2874956A1 true EP2874956A1 (fr) 2015-05-27

Family

ID=48747592

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13734439.6A Withdrawn EP2874956A1 (fr) 2012-07-19 2013-07-09 Traitement anaérobie des eaux usées avec dégazage et recyclage des boues, et installation de traitement

Country Status (4)

Country Link
EP (1) EP2874956A1 (fr)
CN (1) CN104470859A (fr)
DE (1) DE102012212675A1 (fr)
WO (1) WO2014012817A1 (fr)

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NZ758065A (en) 2013-10-22 2022-08-26 Nuvoda Llc Reduction of substances in contaminated fluids using a naturally occurring biological growth media
DK3146035T3 (da) * 2014-05-21 2021-08-09 Nuvoda Llc Biofilmmedier, behandlingssystem og behandlingsfremgangsmåde
DE102017001093A1 (de) 2016-04-07 2017-10-26 Entex Rust & Mitschke Gmbh Entgasen bei der Extrusion von Kunststoffen mit Filterscheiben aus Sintermetall
DE102015001167A1 (de) 2015-02-02 2016-08-04 Entex Rust & Mitschke Gmbh Entgasen bei der Extrusion von Kunststoffen
DE102017004563A1 (de) 2017-03-05 2018-09-06 Entex Rust & Mitschke Gmbh Entgasen beim Extrudieren von Polymeren
CN107601664A (zh) * 2017-10-30 2018-01-19 北京建工金源环保发展股份有限公司 新型循环膨胀污泥床厌氧反应器
DE102018001412A1 (de) 2017-12-11 2019-06-13 Entex Rust & Mitschke Gmbh Entgasen beim Extrudieren von Stoffen, vorzugsweise von Kunststoffen
DE102020002363A1 (de) * 2020-04-20 2021-10-21 Meri Environmental Solutions Gmbh Verfahren und Anlage zur anaeroben Reinigung von Abwasser und/oder Prozesswasser umfassend Steuerung des Gehalts an anorganischen Feststoffen

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Also Published As

Publication number Publication date
DE102012212675A1 (de) 2014-02-27
WO2014012817A1 (fr) 2014-01-23
CN104470859A (zh) 2015-03-25

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