DE3221287A1 - Process for eliminating phosphorus compounds from waste water - Google Patents

Process for eliminating phosphorus compounds from waste water

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Publication number
DE3221287A1
DE3221287A1 DE19823221287 DE3221287A DE3221287A1 DE 3221287 A1 DE3221287 A1 DE 3221287A1 DE 19823221287 DE19823221287 DE 19823221287 DE 3221287 A DE3221287 A DE 3221287A DE 3221287 A1 DE3221287 A1 DE 3221287A1
Authority
DE
Germany
Prior art keywords
sludge
nitrates
nitrites
water
wastewater
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Withdrawn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
DE19823221287
Other languages
German (de)
Inventor
Hubertus 6253 Hadamar Stähler
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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
Priority to DE19823221287 priority Critical patent/DE3221287A1/en
Publication of DE3221287A1 publication Critical patent/DE3221287A1/en
Withdrawn legal-status Critical Current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
    • C02F3/1215—Combinations of activated sludge treatment with precipitation, flocculation, coagulation and separation of phosphates
    • 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
    • C02F3/308—Biological phosphorus removal
    • 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

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

Abstract

In processes for biological clarification of waste waters, the waste water is passed through an activated-sludge tank to convert organic nitrogen compounds into nitrites and nitrates and, to separate water and sludge, through a secondary clarification tank, from which water and sludge are separately withdrawn. The sludge withdrawal is periodically interrupted. During the interruption, the nitrites and nitrates are degraded by microbes, the oxygen being taken up by the microbes and the nitrogen escaping in the gaseous state from the water. In order also to eliminate the phosphorus compounds from the water, the content of free oxygen in the waste water in the activated-sludge tank is maintained at a value sufficient for nitrification of the organic nitrogen compounds and the withdrawal of sludge is only interrupted for a period of time sufficient for a denitrification of the nitrites and nitrates.

Description

"Verfahren zur Entfernung von Phosphorverbindungen"Process for removing phosphorus compounds

aus Abwassser" Die Erfindung betrifft ein Verfahren zur Entfernung von Phosphorverbindungen aus Abwasser bei der biologischen Klärung, bei dem das zu klärende Abwasser zur Umwandlung organischer Stickstoffverbindungen in Nitrite und Nitrate durch ein Belebungsbecken und zur Trennung von Wasser und Schlamm durch ein Nachklärbecken geführt wird, aus dem der Schlamm und das Abwasser getrennt abgezogen werden, wobei bei überschreiten eines vorbestimmten Gehaltes an Nitriten und Nitraten im Nachklärbecken das Abziehen von Schlamm für einen von diesem Gehalt abhängigen Zeitraum unterbrochen wird. from sewage " The invention relates to a method for the removal of phosphorus compounds from wastewater during biological treatment, in which the wastewater to be treated converts organic nitrogen compounds into nitrites and nitrates through an aeration tank and to separate water and Sludge is passed through a secondary clarifier, from which the sludge and waste water are deducted separately, with exceeding a predetermined content the removal of sludge for one of the nitrites and nitrates in the secondary clarifier this salary-dependent period is interrupted.

Sind Phosphorverbindungen in Abwässern in zu großer Menge enthalten, wirkt sich dieses auf das tierische und pflanzliche Leben in den Gewässern, in die die Abwässer geleitet werden, schädlich aus.If too much phosphorus compounds are contained in wastewater, this affects the animal and vegetable life in the waters in which the sewage is discharged from harmful.

Aus der deutschen Offenlegungschrift 2 634 632 ist ein Verfahren bekannt, bei dem zur Umsetzung der in Abwasser enthaltenen organischen Stickstoffverbindungen in Nitrite und Nitrate das Abwasser mittels eines biologischen Rasens und/oder mit Belebschlamm behandelt und belüfte#-r#ind dann der Schlamm vom Wasser abgetrennt wird, wobei bei der Trennung des Wassers vom Schlamm der Schlammabzug, abhängig von der Konzentration der Nitrite und Nitrate im Abwasser, periodisch für einen von der Konzentration abhängigen Zeitraum unterbrochen wird. Während der Unterbrechung des Schlammabzuges werden die denitrifizierenden Bakterien wirksam und lösen aus den Stickstoffverbindungen den Stickstoff, der gasförmig entweicht. Die Phosphorverbindungen bleiben bei einem solchen Verfahren in mehr oder minder großem Umfange im Wasser gelöst und fließen mit ab.A method is known from the German Offenlegungsschrift 2 634 632, in the case of the conversion of the organic nitrogen compounds contained in wastewater in nitrites and nitrates the wastewater by means of a biological lawn and / or with Treated activated sludge and aerate # -r # ind then separate the sludge from the water is dependent on the sludge discharge when the water is separated from the sludge on the concentration of nitrites and nitrates in wastewater, periodically for one is interrupted depending on the concentration. During the interruption of the sludge extraction, the denitrifying bacteria become effective and trigger the nitrogen compounds the nitrogen that escapes in gaseous form. The phosphorus compounds remain in the water to a greater or lesser extent in such a procedure dissolved and flow away with.

Aufgabe vorliegender Erfindung ist es, ein Verfahren der eingangs genannten Art zu schaffen, mit welchem es möglich ist1 auch die Phosphorverbindungen aus dem Abwasser zu entfernen.The object of the present invention is to provide a method of the above to create the type mentioned, with which it is possible1 to also create the phosphorus compounds to remove from sewage.

Diese Aufgabe wird im wesentlichen dadurch gelöst, daß der Gehalt des Abwassers im Belebungsbecken an freiem Sauerstoff auf einen zur Nitrifizierung der organischen Stickstoffverbindungen durch Kleinlebewesen in Nitrite und Nitrate ausreichenden Wert gehalten wird und das Abziehen von Schlamm aus dem Nachklärbecken für einen zur Denitrifikation der Nitrite und Nitrate durch Kleinlebewesen in Stickstoff ausreichenden Zeitraum unterbrochen wird.This object is essentially achieved in that the salary of the wastewater in the aeration tank to free oxygen for nitrification the organic nitrogen compounds by small organisms in nitrites and nitrates sufficient value is maintained and the removal of sludge from the secondary clarifier one for denitrification of nitrites and nitrates by small organisms in nitrogen is interrupted for a sufficient period of time.

Der Gehalt des Abwassers im Belebungsbecken an freiem Sauerstoff sollte geringfügig über den zur Nitrifizierung erforderlichen Mindestwert gehalten werden, vorzugsweise auf einen Wert zwischen 0,3 und 3 mmgr. pro Liter.The free oxygen content of the wastewater in the aeration tank should are kept slightly above the minimum value required for nitrification, preferably to a value between 0.3 and 3 mm. per liter.

Als zweckmäßig erwies es sich, daß Abziehen von Schlamm aus dem Nachklärbecken für einen Zeitraum zu unterbrechen, der zur nahezu vollständigen Denitrifikation der Nitride und Nitrate in Stickstoff ausreicht.It was found to be expedient to remove sludge from the secondary clarifier interrupt for a period of time that leads to almost complete denitrification the nitrides and nitrates in nitrogen is sufficient.

Wie die Praxis zeigte, werden bei einer solchen Verfahrensführung praktisch der gesamte Phosphor bzw. die gesamten Phosphorverbindungen von den Kleinlebewesen aufgenommen und geben im Nachklärbecken die Kleinlebewesen den Phosphor bzw. die Phosphorverbindungen nicht in Form wasserlöslicher Phosphorverbindungen, die sich dann im Wasser lösen, wieder frei. Der Phosphor bzw. die Phosphorverbindungen werden also bei einer solchen Verfahrensführung mit dem überschüssigen Schlamm abgezogen.As practice has shown, such a procedure is carried out practically all of the phosphorus or all of the phosphorus compounds from small organisms absorbed and give the small organisms the phosphorus or the in the secondary clarifier Phosphorus compounds do not exist in the form of water-soluble phosphorus compounds then dissolve in the water, free again. The phosphorus or the phosphorus compounds are thus withdrawn with the excess sludge in such a procedure.

Claims (4)

Patentansprüche 1.) Verfahren zur Entfernung von Phosphorverbindungen aus Abwasser bei der biologischen Klärung, bei dem das zu klärende Abwasser zur Umwandlung organischer Stickstoffverbindungen in Nitrite und Nitrate durch ein Belebungsbecken und zur Trennung von Wasser und Schlamm durch ein Nachklärbecken geführt wird, aus dem der Schlamm und das Wasser getrennt abgezogen werden, wobei bei Überschreiten eines vorbestimmten Gehaltes an Nitriden und Nitraten im Nachklärbecken das Abziehen von Schlamm für einen von diesem Gehalt abhängigen Zeitraum unterbrochen wird, dadurch gekennzeichnet, daß der Gehalt des Abwassers im Belebungbecken an freiem: Sauerstoff auf einen zur Nitrifizierung der organischen Stickstoffverbindungen durch Kleinlebewesen in Nitrite und Nitrate ausreichenden Wert gehalten wird und das Abziehen von Schlamm aus dem Nachklärbecken für einen zur Denitrifikation der Nitrite und Nitrate durch Kleinlebewesen in Stickstoff ausreichenden Zeitraum unterbrochen wird. Claims 1.) Process for removing phosphorus compounds from wastewater in biological treatment, in which the wastewater to be treated is used Conversion of organic nitrogen compounds into nitrites and nitrates by means of an aeration tank and is passed through a secondary clarifier to separate water and sludge from which the sludge and the water are drawn off separately, whereby when exceeded a predetermined content of nitrides and nitrates in the secondary clarifier is interrupted by sludge for a period dependent on this content, thereby characterized that the content of the wastewater in the aeration tank of free: oxygen one for the nitrification of organic nitrogen compounds by small organisms sufficient value is kept in nitrites and nitrates and the removal of sludge from the secondary clarifier for a denitrification of the nitrites and nitrates Small organisms are interrupted in nitrogen for a sufficient period of time. 2.) Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß der Gehalt des Abwassers im Belebungsbecken an freiem Sauerstoff geringfügig über den zur Nitrifizierung erforderlichen Mindestwert gehalten wird. 2.) The method according to claim 1, characterized in that the content of the wastewater in the aeration tank in free oxygen slightly above that for nitrification required minimum value is maintained. 3.) Verfahren nach Anspruch 1 und 2, dadurch gekennzeichnet, daß der Gehalt des Abwassers im Belebungsbecken an freiem Sauerstoff auf einen Wert zwischen 0,3 und 3 mmgr pro Liter gehalten wird. 3.) Method according to claim 1 and 2, characterized in that the free oxygen content of the wastewater in the aeration tank to a value is kept between 0.3 and 3 mmgr per liter. 4.) Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß das Abziehen von Schlamm aus dem Nachklärbecken für einen zur nahezu vollständigen Denitrifikation der Nitrite und Nitrate in Stickstoff ausreichenden Zeitraum unterbrochen wird. 4.) Method according to one of claims 1 to 3, characterized in that that the removal of sludge from the secondary clarifier for a nearly complete Denitrification of nitrites and nitrates in nitrogen is interrupted for a sufficient period of time will.
DE19823221287 1982-06-05 1982-06-05 Process for eliminating phosphorus compounds from waste water Withdrawn DE3221287A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19823221287 DE3221287A1 (en) 1982-06-05 1982-06-05 Process for eliminating phosphorus compounds from waste water

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19823221287 DE3221287A1 (en) 1982-06-05 1982-06-05 Process for eliminating phosphorus compounds from waste water

Publications (1)

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DE3221287A1 true DE3221287A1 (en) 1983-12-08

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DE19823221287 Withdrawn DE3221287A1 (en) 1982-06-05 1982-06-05 Process for eliminating phosphorus compounds from waste water

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DE (1) DE3221287A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3712433A1 (en) * 1987-04-11 1988-10-27 Schreiber Berthold Process for biological waste water purification
US4917802A (en) * 1986-02-10 1990-04-17 Onoda Autoclaved Light Weight Concrete Co., Ltd Method for treating waste water

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4917802A (en) * 1986-02-10 1990-04-17 Onoda Autoclaved Light Weight Concrete Co., Ltd Method for treating waste water
DE3712433A1 (en) * 1987-04-11 1988-10-27 Schreiber Berthold Process for biological waste water purification
US5076928A (en) * 1987-04-11 1991-12-31 Schreiber Corporation, Inc. Process for biological wastewater treatment

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