EP1198422A1 - Procede de traitement d'eaux usees d'une station d'epuration biologique - Google Patents

Procede de traitement d'eaux usees d'une station d'epuration biologique

Info

Publication number
EP1198422A1
EP1198422A1 EP00969376A EP00969376A EP1198422A1 EP 1198422 A1 EP1198422 A1 EP 1198422A1 EP 00969376 A EP00969376 A EP 00969376A EP 00969376 A EP00969376 A EP 00969376A EP 1198422 A1 EP1198422 A1 EP 1198422A1
Authority
EP
European Patent Office
Prior art keywords
setpoint
oxygen
sewage
wastewater
content
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Withdrawn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
EP00969376A
Other languages
German (de)
English (en)
Inventor
Joachim Hertrampf
Helmut Schrenk
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.)
Stadt Neustadt an der Weinstrasse
Air Liquide Deutschland GmbH
Original Assignee
STADT NEUSTADT AN DER WEINSTRA
Stadt Neustadt an der Weinstrasse
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 STADT NEUSTADT AN DER WEINSTRA, Stadt Neustadt an der Weinstrasse, Messer Griesheim GmbH filed Critical STADT NEUSTADT AN DER WEINSTRA
Publication of EP1198422A1 publication Critical patent/EP1198422A1/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Withdrawn legal-status Critical Current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
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/30—Aerobic and anaerobic processes
    • C02F3/302—Nitrification and denitrification treatment
    • 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
    • C02F3/006—Regulation methods for biological treatment
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/14—NH3-N
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/22—O2

Definitions

  • the invention relates to a method for treating wastewater from a biological sewage treatment plant, comprising a first treatment stage in which an oxygen-containing gas is supplied to the wastewater in a controlled manner as a function of a predetermined ⁇ 2 setpoint for the oxygen content in the wastewater, ammonium compounds contained in the wastewater being below Formation of nitrates are oxidized, and a second treatment stage in which the nitrates are removed from the waste water with the formation of gaseous nitrogen.
  • Oxygen is required for nitrification; specifically, 4.6 g 0 2 are required for the conversion of 1 g of NH 4 + ions. Oxygen is artificially added to the activated sludge to accelerate the process.
  • the oxygen content can be kept at a predetermined 0 2 setpoint and an adequate oxygen supply to the microorganisms can be guaranteed.
  • the level of the 0 2 setpoint depends on a large number of parameters, such as the type and extent of the dirt load to be expected, and can differ from wastewater treatment plant to wastewater treatment plant.
  • the oxygen content is usually kept at a 0 2 setpoint of approximately 2 mg / l (mg per liter of waste water).
  • the known method is very well suited for the elimination of nitrogen and it is characterized by high operational reliability.
  • Technical oxygen is usually used to supply the microorganisms with oxygen during the first treatment stage. This results in a significant part of the operating costs in the known treatment method.
  • the invention is therefore based on the object of reducing the oxygen requirement for wastewater purification and thus reducing the operating costs while maintaining a high level of operational reliability.
  • this object is achieved according to the invention by continuously measuring the ammonium content or a property of the waste water which can be correlated therewith, and by specifying the 0 2 setpoint as a function of the measured ammonium content.
  • the method according to the invention comprises a first and a second
  • the first control mechanism regulates the supply of oxygen to the wastewater as a function of a predetermined O 2 setpoint.
  • the controlled variable is therefore the oxygen content in the wastewater.
  • the 0 2 setpoint for the oxygen content in the waste water is regulated depending on the ammonium content in the waste water.
  • the controlled variable is the 0 2 setpoint. In the method according to the invention, this is therefore not a constant variable, but rather a variable which is predetermined by the ammonium content measured in the wastewater and is accordingly used in the first control mechanism.
  • the oxygen input into the wastewater can be adapted to the current need for nitrification. It has been shown that the rate of nitrification depends on the oxygen content of the waste water. Therefore, especially in low load times, for example during the night, the oxygen content in the wastewater can be easily reduced, with the proviso that the reduction takes place as a function of the ammonium content of the wastewater.
  • the O 2 setpoint is therefore not set constantly - as in the known method - but is set variably. This makes it possible to reduce the oxygen consumption for wastewater treatment without any noticeable impairment of the cleaning effect and accordingly to lower the operating costs.
  • the O 2 setpoint is specified depending on the ammonium content. To determine the ammonium content, this is either measured directly in the wastewater, or a property of the wastewater that can be correlated with the ammonium content is measured. In the latter case, the corresponding correlatable property of the waste water can also be used as the control variable for the 0 2 setpoint instead of the ammonium content.
  • the measurement can be carried out continuously or according to time intervals.
  • the wastewater to be treated passes through the first and second treatment stages at least once. It can also go through the treatment stages several times, for example in a circuit.
  • a lower limit of 0.5 mg / 1 is preferably specified for setting the O 2 setpoint. This specification serves to ensure the operational safety of the process, since the oxygen culture below this lower limit could impair the culture of the aerobic microorganisms and the effectiveness of wastewater treatment.
  • a value of 3 mg / 1 is preferably specified as the upper limit for the 0 setpoint.
  • the location of the measurement of the ammonium content or the property correlated therewith has an influence on the measured value and thus on the control behavior of the above-mentioned control mechanisms. For example, a measurement in the area before the first treatment stage - that is, before nitrification - will provide a different measured value for the ammonium content than a measurement in the area after the first or after the second treatment stage.
  • a measurement in the area before the first treatment stage - that is, before nitrification - will provide a different measured value for the ammonium content than a measurement in the area after the first or after the second treatment stage.
  • the ammonium content measured in this way is preferably kept at a nominal NH value in the range between 0.2 and 2.0 mg / l. If there is a deviation from the NH setpoint, the 0 2 setpoint is varied accordingly.
  • Figure 1 shows an embodiment of the method according to the invention in a schematic representation
  • Figure 2 is a measurement and control scheme for performing the method according to the invention.
  • FIG. 1 shows schematically a number of basins (1-4) of a sewage treatment plant, as are usually used for the microbial treatment of organically polluted municipal and industrial wastewater. It is a pre-clarifier
  • SPARE BLADE (RULE 26) 1, a denitrification tank 2, the actual activation tank 3 and one
  • Secondary clarifier 4 The inflow of the wastewater to be treated to the primary clarifier 1 is with the arrow 5 and the drain from the aeration tank 3 into the secondary clarifier
  • two so-called gassing mats 8 are mounted on the pool floor, via which technically pure oxygen is introduced into the waste water.
  • the gassing mats 8 are connected via an oxygen supply line 9 to an oxygen tank (not shown in FIG. 1).
  • the oxygen supply to the gassing mats 8 is controlled by means of a measuring and control device 10 as a function of a predetermined setpoint for the oxygen content in the wastewater of the activation tank 3.
  • an oxygen measuring probe 11 is immersed in the activated sludge.
  • the measured values determined by the oxygen measuring probe 11 are fed to the control device 10 via the line 12.
  • the ammonium content of the waste water is measured in the discharge 6 from the aeration tank 3 to the secondary clarifier 4.
  • an NH measuring device 13 is provided, which is also connected to the control device 10 via a line 14.
  • Submersible agitators 15 are provided in the denitrification basin 2 and in the aeration basin 3, which prevent activated sludge from settling.
  • the wastewater to be treated passes from the primary clarifier 1 and denitrification tank 2 into the activation tank 3, where the so-called nitrification takes place, in which ammonium compounds contained in the sewage water or in the activated sludge of the activation tank 3 are oxidized to nitrates by microorganisms.
  • technical oxygen is introduced into the activated sludge via the gassing mats 8.
  • the oxygen content of the activated sludge is continuously measured by means of the oxygen measuring probe 11 and by means of the control device 10 using a
  • SPARE BLADE (RULE 26) first control mechanism kept at a predetermined 0 2 setpoint.
  • the specification of the 0 2 setpoint lies in the range between 0.5 mg / 1 and 3 mg / 1.
  • the specification of the O 2 setpoint results from a second control mechanism, which is based on a measurement of the ammonium content in the wastewater.
  • the ammonium content is continuously measured in the area of the drain 6 and the measured values are fed to the control device 10.
  • the NH 4 setpoint for the ammonium content in the region of the discharge 6 is 1.0 mg / l (liter, based on waste water).
  • the 0 2 setpoint is lowered by means of the control device 10 as soon as the ammonium content falls below the preset NH setpoint and increases as soon as the ammonium content is above the preset NH 4 setpoint.
  • Aeration tank 4 and the associated withdrawal of the setpoint during low load periods oxygen savings of up to 30% can be achieved.
  • the control device 10 comprises a controller for the setting of the ammonium content in the outlet 6 of the aeration tank 3 (referred to as “NH controller”), an adjuster for the setting of the 0 2 content in the activation tank 3 (as the “O 2 setpoint value” Controller ”) and a controller for setting the 0 2 setpoint (referred to as” 0 2 setpoint controller ").
  • SPARE BLADE Values for the setpoint of the ammonium concentration in sequence 6 (referred to as “NH 4 setpoint”) and an upper and a lower limit for the O 2 setpoint are specified and stored in the control device 10.
  • the limit values for the O 2 - In the exemplary embodiment, the setpoint is 0.5 mg / l or 3 mg / l, and the NH setpoint is set to 1 mg / l.
  • the oxygen content of the waste water 4 (hereinafter referred to as “actual value of O 2 ”) is measured at regular intervals by means of the oxygen measurement probe 11.
  • the ammonium content of the waste water is also measured continuously determined in sequence 6 by means of the NH measuring device (hereinafter referred to as “NH actual value”) as soon as this.
  • the actual NH 4 value is fed to the control device 10 and compared with the target value by means of a processor.
  • the 0 2 setpoint for the oxygen control is reset, provided the 0 2 setpoint to be set is within the specified limit values.
  • This new setting of the 0 2 setpoint takes place in the ⁇ 2 setpoint adjuster.
  • the newly set O 2 setpoint is then used as the basis for the usual regulation of the oxygen content in the aeration tank by means of the 0 2 controller, ie in the event of a discrepancy between the actual O 2 value measured by means of the oxygen measuring probe 11 and the newly set 0 2 setpoint ( ⁇ O 2 # 0) the oxygen input via the gassing mats 8 is set accordingly.

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)
  • Health & Medical Sciences (AREA)
  • Molecular Biology (AREA)
  • Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)

Abstract

L'invention concerne un procédé permettant de décomposer des composés azote contenus dans des eaux usées d'une station d'épuration biologique. Ce procédé comprend une première étape de traitement au cours de laquelle un gaz contenant de l'oxygène est acheminé de manière régulée dans les eaux usées, en fonction d'une valeur théorique de O2 prédéterminée de la teneur d'oxygène dans les eaux usées. Les composés ammonium contenus dans les eaux usées sont oxydés, ce qui entraîne la formation de nitrates. Dans une seconde étape de traitement, les nitrates sont éliminés, ce qui entraîne la formation d'azote gazeux. L'invention vise, sur cette base et en maintenant une haute fiabilité de fonctionnement constante, à réduire les besoins en oxygène et par conséquent à diminuer les coûts de fonctionnement. A cet effet, il est prévu de mesurer en continu la teneur en ammonium ou une propriété des eaux usées pouvant être corrélée avec ladite teneur en ammonium et de déterminer la valeur théorique de O2 en fonction de la teneur en ammonium mesurée.
EP00969376A 1999-10-07 2000-09-30 Procede de traitement d'eaux usees d'une station d'epuration biologique Withdrawn EP1198422A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19948197 1999-10-07
DE1999148197 DE19948197A1 (de) 1999-10-07 1999-10-07 Verfahren zur Behandlung von Abwasser einer biologischen Kläranlage
PCT/EP2000/009623 WO2001025158A1 (fr) 1999-10-07 2000-09-30 Procede de traitement d'eaux usees d'une station d'epuration biologique

Publications (1)

Publication Number Publication Date
EP1198422A1 true EP1198422A1 (fr) 2002-04-24

Family

ID=7924737

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00969376A Withdrawn EP1198422A1 (fr) 1999-10-07 2000-09-30 Procede de traitement d'eaux usees d'une station d'epuration biologique

Country Status (3)

Country Link
EP (1) EP1198422A1 (fr)
DE (1) DE19948197A1 (fr)
WO (1) WO2001025158A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1425483A4 (fr) 2001-06-06 2008-12-03 Univ Virginia Solides cellulaires periodiques multifonctionnels et procede de fabrication desdits solides
FR2871153B1 (fr) * 2004-06-02 2006-08-11 Otv Sa Procede de traitement d'eaux a l'aide d'un reacteur biologique, dans lequel la vitesse d'air injecte dans le reacteur est regulee, et dispositif correspondant
WO2012058102A1 (fr) 2010-10-27 2012-05-03 Miller Chemical & Fertilizer Corporation Formulation d'engrais soluble à base de calcium

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4537682A (en) * 1982-01-29 1985-08-27 Environmental Research & Technology Activated sludge wastewater treating process
DE4024947A1 (de) * 1990-08-07 1992-02-13 Stewing Verwaltungsgesellschaf Verfahren und klaeranlage zum reinigen von abwasser
FR2685692B1 (fr) * 1991-12-31 1997-03-28 Omnium Traitement Valorisa Procede d'epuration d'effluents industriels et/ou urbains du type boues activees.
FR2753191B1 (fr) * 1996-09-10 1998-11-06 Degremont Procede d'epuration de la pollution carbonee et de denitrification en milieu oxygene des eaux usees

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO0125158A1 *

Also Published As

Publication number Publication date
DE19948197A1 (de) 2001-05-31
WO2001025158A1 (fr) 2001-04-12

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