EP0938455A2 - Procede et dispositif d'epuration biologique d'eaux usees - Google Patents

Procede et dispositif d'epuration biologique d'eaux usees

Info

Publication number
EP0938455A2
EP0938455A2 EP97948783A EP97948783A EP0938455A2 EP 0938455 A2 EP0938455 A2 EP 0938455A2 EP 97948783 A EP97948783 A EP 97948783A EP 97948783 A EP97948783 A EP 97948783A EP 0938455 A2 EP0938455 A2 EP 0938455A2
Authority
EP
European Patent Office
Prior art keywords
oxygen
activated sludge
containing gas
wastewater
pure oxygen
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
EP97948783A
Other languages
German (de)
English (en)
Inventor
Monica Hermans
Ulrich Hermanns
Sigurd Schlegel
Andreas Stein
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.)
Messer Griesheim GmbH
Original Assignee
Messer Griesheim 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 Messer Griesheim GmbH filed Critical Messer Griesheim GmbH
Publication of EP0938455A2 publication Critical patent/EP0938455A2/fr
Ceased 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
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/02—Aerobic processes
    • C02F3/12—Activated sludge processes
    • C02F3/26—Activated sludge processes using pure oxygen or oxygen-rich gas
    • 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
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00—Technologies for wastewater treatment
    • Y02W10/10—Biological treatment of water, waste water, or sewage

Definitions

  • the invention relates to a method and a device for biological wastewater treatment according to the preamble of claim 1.
  • the activated sludge process is mostly used for biological wastewater treatment in sewage treatment plants.
  • the different water constituents are breathed in a first process stage, the so-called revitalization, by microorganisms (bacteria) floating in the wastewater in a revitalization basin or used in part to build up new biomass.
  • nitrate is converted to molecular nitrogen (denitrification) and CO 2 is formed.
  • a large part of the gases is removed by ventilation and mechanical circulation and leaves the system via the gas phase.
  • the so-called secondary clarification the bacteria are then separated from the water in a secondary clarifier by sedimentation and can then be returned to the aeration tank.
  • Such sewage treatment plants and processes are described, for example, in "Abwassertechnik", Hosang and Bischof, 9th edition, Verlag BG Teubner, 1989.
  • a permanent or intermittent sludge flotation can lead to an undesired discharge of the sludge from the sewage treatment plant, whereby the permissible limit values, for example for chemical oxygen demand (COD), biochemical oxygen demand (BOD 5 ), nitrogen and suspended matter, can be exceeded.
  • the permissible limit values for example for chemical oxygen demand (COD), biochemical oxygen demand (BOD 5 ), nitrogen and suspended matter.
  • the bacterial mass decreases due to the loss of activated sludge, which reduces the cleaning performance of the sewage treatment plant.
  • DE 43 29 239 A1 also discloses a method and a device for biological wastewater purification, in which and in which water constituents are breathed in by the supply of air or oxygen, the bacteria content in the aeration tank being increased by slat packs arranged at an incline or the activated sludge is thickened and the lamella packs are arranged at a distance at the flow path end of the activated sludge tank before the discharge.
  • This process is intended to significantly reduce the volume of the aeration tanks, with a width of 5 m, a length of 10 m and a depth of 4 m being mentioned as exemplary aeration tank dimensions.
  • This method and device do not relate to deep activation tanks or the problem of sludge flotation.
  • the invention has for its object to improve the method mentioned in such a way that the sludge flotation in the secondary clarifier is avoided relatively safely.
  • the process should not require any further process steps or complex additional installations in settling tanks.
  • This object is achieved in that, at least in part of the aerobic pool volume of the activated sludge tank, an oxygen-containing gas with an oxygen content that is higher than that of air or pure oxygen is fed continuously or temporarily to the waste water / activated sludge mixture.
  • an oxygen-containing gas with an oxygen content that is higher than that of air or pure oxygen is fed continuously or temporarily to the waste water / activated sludge mixture.
  • sludge flotation in the secondary settling tank is avoided relatively reliably by increasing the oxygen input into the activation stage.
  • Oxygen content or pure oxygen is added to the wastewater / activated sludge mixture until the proportion of dissolved oxygen in the total content of dissolved gases is so high that the use of nitrate or nitrite in the secondary settling tank contained oxygen is prevented by the bacteria.
  • oversaturation with nitrogen can be prevented if the oxygen-containing gas or pure oxygen is used in the entire aerobic part of the activation stage.
  • oxygen-containing gas or pure oxygen is only supplied in a section of the aerobic part of the activation stage, the preceding aeration or denitrification in the anoxic part / process step initially results in an increase in the dissolved gas content in the wastewater / activated sludge mixture, however Before leaving the aeration tank, it is reduced with the help of the oxygen-containing gas or pure oxygen. At the same time, the necessary supply with
  • the wastewater / activated sludge mixture is supplied with a large amount of the oxygen-containing gas or pure oxygen until an oxygen content of at least approximately 1 to 2 mg / l has been established therein.
  • the optimal oxygen content and the optimal amount of oxygen to be supplied depend on the wastewater to be cleaned, the sewage treatment plant and its special procedure and can be determined by a few simple tests.
  • a particular advantage of the method according to the invention is that, in principle, no further installations in the activation tank are required to carry it out.
  • the oxygen-containing gas or the pure oxygen can be supplied via the same device which is also used to introduce the air into the waste water / activated sludge mixture.
  • all conventional ventilation devices can be used, with devices for fine-bubble pressure ventilation, such as candle aerators or plate aerators, being preferred. It is also intended to use devices designed specifically for pure oxygen, for example a gassing hose, an ejector (pump with venturi tube and mixing chamber) or oxidizer (pressure vessel through which water flows), but preferably a gassing hose.
  • the aforementioned devices advantageously cause relatively low investment costs and do not require any additional space.
  • the supply of compressed air and oxygen-containing gas or the pure oxygen can be spatially separated, which means that the supply takes place in different sections of the Activation basin or different, individual basin of activation.
  • the supply can also be carried out at different times, for example in a round, relatively large activation tank of a smaller sewage treatment plant.
  • the method according to the invention saves energy costs for the pressurized aeration, and an adequate oxygen supply to the activation stage is ensured even when the sewage treatment plant is subjected to a shock.
  • Pure oxygen is preferably used as the oxygen-containing gas.
  • the term "pure oxygen” here means oxygen, which is one
  • Saturation value less than 150%, preferably less than 110%, is before the wastewater / activated sludge mixture is sent to the clarification.
  • the total gas content here is the sum of the gas contents in% of the partial pressure of the corresponding gas in the ambient air, which is contained in the wastewater / activated sludge mixture, based on atmospheric pressure and at a given temperature.
  • the gases are mainly nitrogen, carbon dioxide and oxygen.
  • the oxygen-containing gas or pure oxygen is fed to the activation tank in the last third of the activation tank or in the last aerobic tank of a tank cascade. It is advantageous that the oxygen-containing gas or pure oxygen replaces the conventional ventilation only temporarily, but preferably for 15 to 45 minutes per hour.
  • the oxygen-containing gas or pure oxygen preferably replaces the conventional ventilation with an increased hydraulic load, which can occur, for example, as a result of a rain event.
  • the addition of oxygen-containing gas or pure oxygen takes place according to the level of the sludge level in the secondary clarifier. It is also envisaged to regulate the addition of oxygen-containing gas or pure oxygen as a function of the total gas content in the wastewater / activated sludge mixture.
  • the entry of the oxygen-containing gas or pure oxygen can also be carried out according to two temporally and / or spatially separated setpoints for the oxygen content in the waste water / activated sludge mixture or according to a specified setpoint value for the oxygen content and a specified setpoint value for the total gas content in the waste water / activated sludge.
  • Mixture can be regulated.
  • the control is advantageously carried out in such a way that the oxygen content in the wastewater / activated sludge mixture at the outlet of the
  • Activation level is not less than 1 to 2 mg / l and not higher than 10 mg / l, with the total gas content in the
  • Waste water / activated sludge mixture is simultaneously less than 110%. Regulation according to two setpoints that are predefined in terms of time and / or space is particularly advantageous when the waste water is relatively low
  • the oxygen-containing gas or pure oxygen can be supplied via all conventional supply methods, for example a liquid storage tank, on-site process or a pipeline.
  • the term "pipeline” here means an existing pipeline of a fixed pipeline network or a pipeline to a neighboring source for the oxygen-containing gas or pure oxygen, for example an adjacent air separation plant.
  • the supply via a pipeline is preferred because it enables a relatively high level of operational security and great security of supply with a relatively low technical outlay and a small space requirement.
  • the oxygen-containing gas or pure oxygen is additionally supplied to the wastewater / activated sludge mixture in the event of load impacts on the wastewater with an increased oxygen requirement or with an increased energy requirement of the sewage treatment plant.
  • the pressure ventilation can be reduced or even completely interrupted and partially or completely replaced by the supply of the oxygen-containing gas or pure oxygen.
  • the invention is further achieved by a device for biological wastewater treatment with activated sludge tanks with a depth greater than approx. 5 m, in which the sludge tank is assigned a device for supplying an oxygen-containing gas with an oxygen content that is higher than air or pure oxygen into the waste water / activated sludge mixture , which is suitable for fine-bubble pressure ventilation.
  • the sludge tank is assigned a device for supplying an oxygen-containing gas with an oxygen content that is higher than air or pure oxygen into the waste water / activated sludge mixture , which is suitable for fine-bubble pressure ventilation.
  • Plate aerators or are preferably used as devices for fine-bubble pressure ventilation
  • Candle aerator is used and the device is advantageously assigned a pipeline for supplying an oxygen-containing gas with an oxygen content that is higher than that of air or pure oxygen. It is provided according to the invention to arrange devices for measuring the oxygen content in the wastewater / activated sludge mixture in the aerobic region of the activation tank and preferably to measure the oxygen content with the aid of probes.
  • Membrane electrodes so-called “Clark electrodes”, can preferably be used as probes for oxygen concentration measurement.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Microbiology (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Activated Sludge Processes (AREA)
  • Aeration Devices For Treatment Of Activated Polluted Sludge (AREA)

Abstract

Selon ce procédé d'épuration biologique d'eaux usées dans une installation de clarification équipée de bassins d'activation de plus de 5 m environ de profondeur, un gaz avec une teneur en oxygène supérieure à celle de l'air ou de l'oxygène pur est amené en continu ou temporairement au mélange d'eaux usées et de boues d'activation dans au moins une partie du volume aérobie du bassin d'activation.
EP97948783A 1996-10-31 1997-10-23 Procede et dispositif d'epuration biologique d'eaux usees Ceased EP0938455A2 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19644080 1996-10-31
DE1996144080 DE19644080A1 (de) 1996-10-31 1996-10-31 Verfahren und Vorrichtung zur biologischen Abwasserreinigung
PCT/EP1997/005847 WO1998018727A2 (fr) 1996-10-31 1997-10-23 Procede et dispositif d'epuration biologique d'eaux usees

Publications (1)

Publication Number Publication Date
EP0938455A2 true EP0938455A2 (fr) 1999-09-01

Family

ID=7809784

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97948783A Ceased EP0938455A2 (fr) 1996-10-31 1997-10-23 Procede et dispositif d'epuration biologique d'eaux usees

Country Status (5)

Country Link
US (1) US6280624B1 (fr)
EP (1) EP0938455A2 (fr)
AU (1) AU6908198A (fr)
DE (1) DE19644080A1 (fr)
WO (1) WO1998018727A2 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10059441A1 (de) * 2000-11-30 2002-06-20 Messer Griesheim Gmbh Verfahren zur Flotation von Wasser
DE10059897A1 (de) * 2000-12-01 2002-06-20 Messer Griesheim Gmbh Verfahren zur biologischen Reinigung von organisch belasteten Abwässern
DE10061486A1 (de) * 2000-12-09 2002-06-20 Messer Tatragas S R O Verfahren und Vorrichtung zur biologischen Abwasserreinigung
DE50300678D1 (de) * 2003-02-07 2005-07-28 Delphin Umwelttechnik Gmbh Verfahren zur Beeinflussung des Schlammvolumenindex mit dem Ziel der Schwimmschlammvermeidung auf Kläranlagen
DE102004022766A1 (de) * 2004-05-05 2005-12-01 Bayer Chemicals Ag Schäume zur Entfernung von Schadstoffen und/oder Schwermetallen aus strömbaren Medien
US7699980B2 (en) 2007-08-24 2010-04-20 Praxair Technology, Inc. System for activated sludge wastewater treatment with high dissolved oxygen levels
US10669177B1 (en) * 2017-06-14 2020-06-02 Stallion Oilfield Services Ltd. Apparatus and method for recycling blackwater and greywater at oil and gas well sites

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US3574331A (en) * 1968-12-18 1971-04-13 Mitsubishi Kakoki Kk Aeration tank for waste treatment
US3547812A (en) * 1969-07-02 1970-12-15 Union Carbide Corp High oxygen utilization in bod-containing water treatment
US3772187A (en) * 1971-07-14 1973-11-13 D Othmer Sewage treatment process
US4163712A (en) * 1973-01-08 1979-08-07 Boc Limited Treatment of liquid
US3968035A (en) * 1973-04-05 1976-07-06 Eli Lilly And Company Super-oxygenation method
US3954606A (en) * 1973-11-12 1976-05-04 Air Products And Chemicals, Inc. Wastewater treatment system with controlled mixing
DE2420076A1 (de) * 1974-04-25 1975-11-13 Bayer Ag Vorrichtung zum kontinuierlichen eintrag von sauerstoff in ein kontinuierlich betriebenes einstufiges belebtschlammbecken
US4202763A (en) * 1975-02-07 1980-05-13 Hitachi, Ltd. High-efficient activated sludge method
US3994802A (en) * 1975-04-16 1976-11-30 Air Products And Chemicals, Inc. Removal of BOD and nitrogenous pollutants from wastewaters
US4166790A (en) * 1975-04-17 1979-09-04 Bayer Aktiengesellschaft Single stage process for continuous introduction of oxygen-containing gases into effluent containing activated sludge
GB1593253A (en) * 1976-08-24 1981-07-15 Boc Ltd Biological treatment of aqueous waste material with oxygen
US4104167A (en) * 1976-10-08 1978-08-01 Ferdinand Besik Apparatus for purifying waste waters
US4374027A (en) * 1978-02-06 1983-02-15 International Telephone And Telegraph Corporation Process for the secondary treatment of wastewater
US4206047A (en) * 1978-07-13 1980-06-03 Houdaille Industries, Inc. Multi-stage systems for waste water oxidation
GB2071633B (en) * 1980-03-07 1984-02-08 Kubota Ltd Waste water treating apparatus
DE3028336C2 (de) * 1980-07-25 1985-08-01 Wilhelm Roediger Gmbh + Co, 6450 Hanau Verfahren zum biologischen Reinigen von Abwasser
DE3129926A1 (de) * 1981-07-29 1983-02-17 Bayerische Milchindustrie eG, 8000 München Vorrichtung zur biologischen reinigung organischer abwaesser
JPS58216788A (ja) * 1982-06-01 1983-12-16 Kurita Water Ind Ltd 汚水の曝気装置
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Also Published As

Publication number Publication date
WO1998018727A2 (fr) 1998-05-07
WO1998018727A3 (fr) 1998-07-09
AU6908198A (en) 1998-05-22
US6280624B1 (en) 2001-08-28
DE19644080A1 (de) 1998-05-07

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