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WO1997035809A1 - Procede de traitement d'eaux usees avec des boues activees et dispositif de mise en oeuvre dudit procede - Google Patents

Procede de traitement d'eaux usees avec des boues activees et dispositif de mise en oeuvre dudit procede Download PDF

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Publication number
WO1997035809A1
WO1997035809A1 PCT/EP1997/001526 EP9701526W WO9735809A1 WO 1997035809 A1 WO1997035809 A1 WO 1997035809A1 EP 9701526 W EP9701526 W EP 9701526W WO 9735809 A1 WO9735809 A1 WO 9735809A1
Authority
WO
WIPO (PCT)
Prior art keywords
stage
stages
wastewater
treated
activated sludge
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/EP1997/001526
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German (de)
English (en)
Inventor
Leonhard Fuchs
Martin Fuchs
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of WO1997035809A1 publication Critical patent/WO1997035809A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • C02F3/1205—Particular type of activated sludge processes
    • C02F3/121—Multistep treatment
    • 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 present invention relates to a method for treating waste water with activated sludge with at least one activation stage and a secondary clarification stage, and a device for carrying out the method.
  • DE 40 31 292 AI describes larger wastewater treatment plants which have a modular structure, ie have a plurality of structurally identical round tanks as aeration tanks (7), secondary settling tanks (8) and pre-thickener tanks (11). According to their function, the pools are unified and therefore inexpensive. inexpensive mechanical equipment. According to drawing 1, it is provided that the unpurified wastewater is mechanically cleaned by means of a computer system (3), sand trap (4) and two preliminary clarification tanks (6) and then biologically treated in six aeration tanks (7) and eight secondary settling tanks (8). Two pre-thickener basins (11) are provided for the excess sludge. The wastewater should flow through the computer system, from there via the sand trap to the preliminary clarification basin, further into the aeration basin and then as treated wastewater in the secondary clarification basin and finally to the receiving water.
  • WO 96/02468 describes a process for the purification of wastewater with activated sludge, the activated sludge tank being divided into four zones and being subsequently clarified. Two alternating phases are provided for loading and operating the four zones of the activation stage.
  • phase A the untreated wastewater and the return sludge (from the secondary clarification stage) are fed to zone 1 and only mixed there, so that an anoxic state occurs.
  • zone 1 the wastewater-activated sludge mixture flows into stage 2, which is aerated, from there m zone 3, which is also aerated, from there m stage 4, which is neither aerated nor stirred, so that the revitalized ⁇ mud already begins to flocculate there, and finally into the clarification.
  • phase B the untreated wastewater and the return sludge (from the clarification) are fed to zone 3 and only mixed there, so that an anoxic state occurs.
  • zone 3 the wastewater-activated sludge mixture flows into zone 4, which is aerated, from there m zone 1, which is also aerated, from there m zone 2, which is neither stirred nor aerated, so that the revitalized ⁇ mud already begins to flocculate there, and finally into the clarification.
  • DE 44 07 773 AI describes a method and a device for the purification of wastewater by the activated sludge process with nitrification and upstream denitrification, the activation stage being followed by a permanent secondary clarification stage.
  • the aeration stage consists of a group of alternately non-aerated (denitrification) and aerated (nitrification) pool units.
  • the recirculation of the nitrate-containing wastewater from the aerobic zone (aerated pool units) into the upstream anoxic zone (non-aerated pool units) should not take place with mechanical conveying units, but rather by means of pneumatic energy.
  • GB 2 112 768 A describes an aeration plant in which wastewater is to be biologically cleaned, and this plant consists of an aeration stage with three zones and a downstream post-treatment stage.
  • the wastewater to be treated and the return sludge (microorganisms) should be fed to the first zone of the activation stage. From there, the wastewater-activated sludge mixture flows into Zone 2, from there into Zone 3 and finally to the secondary clarification stage. Ventilation should be strongest in zone 2 and weakest in zone 3.
  • DE 295 08 289 U1 describes a sewage treatment plant in which a rectangular activated sludge tank (1), a rectangular secondary clarification tank (2) and a rectangular sludge stacking room (3) are arranged together on a rectangular floor plan in such a way that the individual tanks without Connect "dead” spaces directly to each other. A function is assigned to the individual pools by their designation.
  • the sludge stacking room does not belong directly to biological wastewater treatment.
  • the object of the invention is therefore to simplify and improve the process for treating waste water with activated sludge with at least one activation stage and a secondary clarification stage in such a way that it requires less investment with low operating costs and does not reduce efficiency and Reliability loses.
  • This object can be achieved surprisingly simply by switching at least three interconnected stages A, B and C alternately so that either stages A and B together as an activation stage and stage C as a secondary clarification stage with sedimentation of the activated sludge or stages C and B together act as an activation stage and stage A as a secondary clarification stage with sedimentation of the activated sludge, the wastewater to be treated being fed to stage A or C which is switched as activation stage and the treated wastewater is discharged as an upper course from the respective secondary clarification stage.
  • stage A or C the wastewater to be treated is fed alternately into either stage A or C, that the treated wastewater is withdrawn from stage C or A at the same time, and that stage B always serves as an activation stage.
  • stage B is stirred and / or aerated continuously or almost continuously
  • stages A and C are only stirred and / or aerated in the first period of the phase in which they are switched as the activation stage are and in the second period of the activation stage and during the phase in which they are switched as a secondary clarification stage and the activated sludge sedimented, are neither stirred nor aerated.
  • the process according to the invention thus operates semi-continuously in alternating cycles, the waste water treatment running once in the direction from A to C and then in the direction C to A.
  • the middle level B acts in any case as an activation level. It can therefore be stirred and / or aerated continuously or almost continuously, which contributes significantly to the efficiency and increase in the throughput capacity of the system.
  • Levels A and C are also stirrable and ventilated Basins or tanks and alternately act either with level B together as an aeration stage or by themselves as a secondary clarification stage with sedimentation.
  • the method according to the invention can therefore dispense with a special configuration of the secondary clarification tank, for example with a lower-lying conical part, and the separate pumping of return sludge into the aeration tank. Only the excess sludge has to be pumped out. This can be done from stage B. Of course, an excess sludge with a lower solids content is obtained than when the excess sludge is alternately pumped out of stages C and A, specifically from the range of the optimal sedimentation.
  • Another advantage of the method according to the invention is that it is not necessary to pump the activated sludge from one stage to the other, since the stages are connected to one another.
  • These connections can be simple windows or connecting pipes. They should be dimensioned such that, on the one hand, there is no backflow and, on the other hand, stirring and aeration in stage B do not lead to any greater impairment of the sedimentation of the activated sludge in the secondary clarification stage.
  • the device for carrying out the method according to the invention thus consists of at least three interconnected basins or tanks for stages A, B and C, stirring and ventilation devices which can be switched on and off independently of one another and can be switched on and off independently Waste water supply for the pools or tanks of stages A and C, outlets that can be switched on and off independently of one another for treated waste water from the pools or tanks of stages A and C, pumping devices for excess sludge from the pool or tank of stage B and / or Stages A and C and a control device for switching the stirrers on and off, the aeration, the supply of waste water, the discharge of treated waste water and the pumping device for excess sludge.
  • the device is preferably designed such that the control device can be set to clock cycles.
  • the operation of the aerators and / or agitators can also be carried out using other measured variables such as the O content, the nitrogen content or the redox potential are regulated.
  • This time cycle can be set to four hours, for example. If stage A or C is continuously stirred but not continuously aerated in the time phase in which it acts together with stage B as a revitalization stage, it is entirely possible to achieve denitrification in this phase. In addition, it is of course possible to subject the wastewater to a denitrification stage before the treatment according to the method of the invention and then to pump this partially pretreated wastewater alternately into stage A or C.
  • A, B and C the three levels
  • Switchable shut-off devices for pumping out excess sludge from one of the stages A, B or C.

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)

Abstract

L'invention concerne un procédé de traitement d'eaux usées avec des boues activées, qui comporte au moins un étage d'épuration par boues activées et un étage de décantation finale. Selon ce procédé, au moins trois étages interconnectés sont commutés en alternance, de manière que soit les étages A et B coopèrent en tant qu'étage d'épuration par boues activées et l'étage C fasse office d'étage de décantation finale avec sédimentation des boues activées, soit les étages C et B coopèrent en tant qu'étage d'épuration par boues activées et l'étage A fasse office d'étage de décantation finale avec sédimentation des boues activées. Les eaux usées à traiter sont renvoyées à l'étage A ou C commuté en étage d'épuration par boues activées. Les eaux usées sont extraites sous forme de nappe supérieure de l'étage de décantation finale avec sédimentation concerné. Le dispositif comprend des bassins ou des réservoirs interconnectés, équipés d'agitateurs et de dispositifs de ventilation pouvant être mis en marche et arrêtés indépendamment les uns des autres, des amenées pour les eaux usées, des évacuations pour les eaux usées traitées, des dispositifs de pompage pour les boues excédentaires et un dispositif de commande pour lancer et arrêter les agitateurs, les dispositifs de ventilation, l'apport d'eaux usées, l'évacuation des eaux usées traitées et le dispositif de pompage pour les boues excédentaires.
PCT/EP1997/001526 1996-03-27 1997-03-26 Procede de traitement d'eaux usees avec des boues activees et dispositif de mise en oeuvre dudit procede Ceased WO1997035809A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19612082 1996-03-27
DE19612082.9 1996-03-27

Publications (1)

Publication Number Publication Date
WO1997035809A1 true WO1997035809A1 (fr) 1997-10-02

Family

ID=7789567

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1997/001526 Ceased WO1997035809A1 (fr) 1996-03-27 1997-03-26 Procede de traitement d'eaux usees avec des boues activees et dispositif de mise en oeuvre dudit procede

Country Status (2)

Country Link
AR (1) AR006335A1 (fr)
WO (1) WO1997035809A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19908872A1 (de) * 1999-03-01 2000-09-14 Norbert Ahlfaenger Multifunktionsbecken, Absetzbecken zur kontrollierten Feststoffentnahme
AT515878A1 (de) * 2014-05-28 2015-12-15 Bernhard Dr Wett Verfahren zur Abwasserklärung

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3147927A1 (de) * 1981-12-03 1983-06-16 Linde Ag, 6200 Wiesbaden Verfahren zur biologischen reinigung von abwasser
EP0524794A1 (fr) * 1991-07-26 1993-01-27 Thames Water Utilities Limited Procédé et dispositif pour le traitement de fluides
WO1996002468A1 (fr) * 1994-07-14 1996-02-01 Krüger A/S Procede et appareil de purification des eaux usees par la methode des boues activees

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3147927A1 (de) * 1981-12-03 1983-06-16 Linde Ag, 6200 Wiesbaden Verfahren zur biologischen reinigung von abwasser
EP0524794A1 (fr) * 1991-07-26 1993-01-27 Thames Water Utilities Limited Procédé et dispositif pour le traitement de fluides
WO1996002468A1 (fr) * 1994-07-14 1996-02-01 Krüger A/S Procede et appareil de purification des eaux usees par la methode des boues activees

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19908872A1 (de) * 1999-03-01 2000-09-14 Norbert Ahlfaenger Multifunktionsbecken, Absetzbecken zur kontrollierten Feststoffentnahme
AT515878A1 (de) * 2014-05-28 2015-12-15 Bernhard Dr Wett Verfahren zur Abwasserklärung
AT515878B1 (de) * 2014-05-28 2019-09-15 Dr Wett Bernhard Verfahren zur Abwasserklärung

Also Published As

Publication number Publication date
AR006335A1 (es) 1999-08-25

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