WO1998018729A1 - Method for the biological and biological-chemical treatment of waste water and plant for carrying out this method - Google Patents

Method for the biological and biological-chemical treatment of waste water and plant for carrying out this method Download PDF

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Publication number
WO1998018729A1
WO1998018729A1 PCT/DE1997/002404 DE9702404W WO9818729A1 WO 1998018729 A1 WO1998018729 A1 WO 1998018729A1 DE 9702404 W DE9702404 W DE 9702404W WO 9818729 A1 WO9818729 A1 WO 9818729A1
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Prior art keywords
activated sludge
tank
biological
separator
solids
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PCT/DE1997/002404
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German (de)
French (fr)
Inventor
Bernd Diering
Andreas Diering
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Bernd Diering
Andreas Diering
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Application filed by Bernd Diering, Andreas Diering filed Critical Bernd Diering
Publication of WO1998018729A1 publication Critical patent/WO1998018729A1/en

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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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D21/00—Separation of suspended solid particles from liquids by sedimentation
    • B01D21/0039—Settling tanks provided with contact surfaces, e.g. baffles, particles
    • B01D21/0045—Plurality of essentially parallel plates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D21/00—Separation of suspended solid particles from liquids by sedimentation
    • B01D21/24—Feed or discharge mechanisms for settling tanks
    • B01D21/2444—Discharge mechanisms for the classified liquid
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D21/00—Separation of suspended solid particles from liquids by sedimentation
    • B01D21/24—Feed or discharge mechanisms for settling tanks
    • B01D21/2488—Feed or discharge mechanisms for settling tanks bringing about a partial recirculation of the liquid, e.g. for introducing chemical aids
    • 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 for the biological and biological-chemical treatment of wastewater using activated sludge in a activated sludge tank and a system for carrying out this method with activated sludge tanks containing at least one activated sludge with an inlet and an outlet.
  • the usual systems of this type consist of an activated sludge tank, in which the waste water is cleaned with activated sludge, and a downstream secondary clarifier, in which the activated sludge and waste water are separated.
  • the cleaned wastewater is then drained off via drainage channels in the after-treatment.
  • the sedimented activated sludge is drawn off from the bottom of the secondary clarification tank by room equipment and returned to the aeration tank as a return sludge. This recirculation is necessary in order to ensure the desired high activated sludge concentration in the activated sludge tank in order to maintain the biological degradation processes. There is no retention of the activated sludge in the activation tank.
  • the activated sludge concentration in the outlet of the activated sludge tank is equal to that in the activated sludge tank as a whole.
  • This known method of operation requires large secondary clarifiers for retention, sedimentation, thickening and storage of the activated sludge.
  • the activated sludge concentration ie the amount of biomass working in the activated sludge tank, is limited, very large volumes are also required in the activated sludge tank.
  • the invention is based on the object of specifying a method and a system for carrying it out in order to increase the activated sludge concentration in the activated sludge tank and to manage without or with secondary settling tanks with a considerably reduced volume.
  • the system proposed according to the invention for carrying out the described method provides that a separator for activated sludge and solids is connected upstream of the outflow in the activation tank (s).
  • the activation tank can be part of an overall system of any design.
  • several aeration tanks can be arranged in series or in parallel.
  • the pools can e.g. around a secondary clarifier arranged centrally.
  • the activation tank can also be designed as an endless trench.
  • the separator is a lamella separator.
  • These can be, for example, co-current, counter-current, diagonal-flow, cross-flow lamella separators, which separate waste water and activated sludge in the aeration tank.
  • the invention further provides that the process of the aeration tank flows into a secondary clarifier.
  • the invention further provides that a Ruckbowungslei device for activated sludge is provided between secondary clarifier and aeration tank.
  • the invention further provides that the aeration tank has zones for pretreatment, in particular denitrification and dephosphatization.
  • the invention further provides that a separator for activated sludge and solids is provided at the exit of the dephosphation zone and that this zone is connected to the secondary settling tank via a return line for activated sludge.
  • the invention further provides that a recirculation line is provided which connects the outlet area of the activated sludge tank to the denitrification zone.
  • Fig. 1 is a schematic plan view of an embodiment of the plant according to the invention.
  • Fig. 2 shows a partial section through the drainage area of an aeration tank.
  • the exemplary embodiment now to be described with reference to the figures has an activation tank 1 and a secondary clarification tank 2.
  • the activation tank 1 is provided with an inlet 4 for waste water. This wastewater first reaches a dephosphating zone 3, from which it passes into the denitrification zones 6, 7 via a separator 5 for activated sludge and solid matter.
  • the activation tank is 1 opposite the inlet 4 with an outlet 8.
  • a further separator 9 is arranged in the activation tank 1, which is described below with reference to FIG. 2.
  • the outlet 8 opens into the secondary clarifier 2.
  • a return line 11 leads from the secondary clarifier 2 to the dephosphating zone 3 and serves to return sludge deposited in the secondary clarifier.
  • a recirculation line 12 extends from the area below the separator 9 in the activation tank 1 and leads into the denitrification zones 6 and 7.
  • the recirculation line 12 allows sludge to be returned to the zones mentioned.
  • the separator 9 shown schematically in Fig. 2 in the Abi area of the aeration tank 1 is a direct current lamella separator, in which the waste water to be cleaned between guide surfaces 13, 14 and lamellae 15, 16 is guided downwards and in the direction of the inlet 4.
  • a large part of the activated sludge and the solids contained in the waste water settles on the upwardly facing surfaces of the fins 15, 16 and the guide surface 14.
  • activated sludge and solids slide down from these surfaces in order to be drawn off below the separator 9.
  • pockets 17 are provided for collecting activated sludge and solids.
  • the at least partially cleaned wastewater emerging from the separator 9 arrives after the separator 9 in the direction of the arrow 18 to the outlet 8, then into the secondary clarifier 2 and finally cleaned therefrom into a trough 19.
  • the separator (5) provided in the dephosphatization zone 5 can be designed as that shown in FIG. 2. However, any separator known for separating similar solids can also be used here.
  • the aeration tank described in FIG. 1 can be easily varied by omitting or changing the dephosphation zone and / or the denitrification zones in view of the particular nature of the waste water.
  • the secondary clarifier described can also be dispensed with under certain circumstances, or it can be replaced by another secondary clarifier.
  • multifunctional and simultaneous wastewater purification, activated sludge and solids retention and thus solids accumulation are achieved up to high concentration ranges.
  • the return of return sludge from a secondary settling basin is considerably reduced or in some cases can be completely eliminated.
  • the Zu! concentration of waste water not diluted by 50%.
  • the effective residence time of the wastewater in the reactor, i.e. the activation tank is increased by up to 70%, in some cases even doubled, with the same pollution load.
  • the biological implementation processes run exponentially faster with higher concentrations of contaminants, the result of the Process according to the invention higher degradation speeds and, as a result, significantly better efficiencies.
  • the process and plant enable the use of small aeration tanks with the same performance as conventional processes and plants.
  • the secondary clarifier volume can be significantly reduced in accordance with the reduced sludge volume feed and can be completely eliminated in special cases.

Abstract

The invention concerns a method for the biological and biological-chemical treatment of waste water using activated sludge in an activation tank (1). The invention further concerns a plant for carrying out this method, wherein the activated sludge concentration in the activation tank (1) is to be increased and it should be possible to proceed without final sedimentation tanks (2) or at least with final sedimentation tanks having a considerably reduced volume. To that end, activated sludge and solids are retained in the outlet region of the activated sludge tank or activation tank (1). For this purpose, a separator (9) for activated sludge and solids is provided upstream of the outlet (8) in the activated sludge tank or activation tank (1), the separator possibly being a plate separator.

Description

VERFAHREN ZUR BIOLOGISCHEN UND BIOLOGISCH-CHEMISCHEN AUFBEREITUNG VON ABWASSER SOWIE ANLAGE ZUR DURCHFÜHRUNG METHOD FOR THE BIOLOGICAL AND BIOLOGICAL-CHEMICAL TREATMENT OF WASTEWATER AND SYSTEM FOR IMPLEMENTING IT
DIESES VERFAHRENSTHIS PROCEDURE
Beschreibungdescription
Die Erfindung betrifft ein Verfahren zur biologischen und biologisch-chemischen Aufbreitung von Abwasser unter Einsatz von Belebtschlamm in einem Belebungsbecken sowie eine Anlage zur Durchfuhrung dieses Verfahrens mit mindestens einem Belebtschlamm enthaltenden Belebungsbecken mit einem Zulauf und einem Ablauf.The invention relates to a method for the biological and biological-chemical treatment of wastewater using activated sludge in a activated sludge tank and a system for carrying out this method with activated sludge tanks containing at least one activated sludge with an inlet and an outlet.
Die üblichen Anlagen dieser Art bestehen aus einem Belebungsbecken, in dem das Abwasser mit Belebtschlamm gereinigt wird, und einem nachgeschalteten Nachklärbecken, in dem eine Separierung von Belebtschlamm und Abwasser erfolgt. Das gereinigte Abwasser wird danach über Ablaufrinnen der Nach- klarung abgeleitet. Der sedimentierte Belebtschlamm wird durch Raumeinrichtungen vom Boden des Nachklärbeckens abgezogen und als Rucklaufschl amm in das Belebungsbecken zurückgeführt. Diese Rückführung ist erforderlich, um zur Auf- rechterha tung der biologischen Abbauprozesse eine gewünscht hohe Belebtschlammkonzentration im Belebungsbecken zu gewährleisten. Ein Ruckhalt des Belebtschlammes im Belebungsbecken findet hierbei nicht statt. Folglich ist die Belebtschlammkonzentration im Ablauf des Belebungsbeckens gleich der im Belebungsbecken insgesamt. Diese bekannte Vei— fahrensweise erfordert gro(3e Nachklärbecken für Ruckhalt, Sedimentation, Eindickung und Speicherung des Belebtschlammes. Da aber die Belebtschlammkonzentration, also die Menge der im Belebungsbecken arbeitenden Biomasse, begrenzt ist, sind auch im Belebungsbecken sehr große Volumina ei— forderl ich. Der Erfindung liegt davon ausgehend die Aufgabe zugrunde, ein Verfahren und eine Anlage zu seiner Durchfuhrung anzugeben, um die Belebtschlammkonzentration im Belebungsbecken zu erhohen und ohne oder mit Nachklärbecken mit erheblich reduziertem Volumen auszukommen.The usual systems of this type consist of an activated sludge tank, in which the waste water is cleaned with activated sludge, and a downstream secondary clarifier, in which the activated sludge and waste water are separated. The cleaned wastewater is then drained off via drainage channels in the after-treatment. The sedimented activated sludge is drawn off from the bottom of the secondary clarification tank by room equipment and returned to the aeration tank as a return sludge. This recirculation is necessary in order to ensure the desired high activated sludge concentration in the activated sludge tank in order to maintain the biological degradation processes. There is no retention of the activated sludge in the activation tank. As a result, the activated sludge concentration in the outlet of the activated sludge tank is equal to that in the activated sludge tank as a whole. This known method of operation requires large secondary clarifiers for retention, sedimentation, thickening and storage of the activated sludge. However, since the activated sludge concentration, ie the amount of biomass working in the activated sludge tank, is limited, very large volumes are also required in the activated sludge tank. The invention is based on the object of specifying a method and a system for carrying it out in order to increase the activated sludge concentration in the activated sludge tank and to manage without or with secondary settling tanks with a considerably reduced volume.
Diese Aufgabe wird bei einem Verfahren der eingangs erwähnten Art dadurch gelost, daß im Ablaufbereich des Belebungs- beckens / der Belebungsbecken Belebtschlamm und Feststoffe zurückgehalten werden. Auf diese Weise wird eine Erhöhung der Belebtschlammkonzentration im Belebungsbecken erreicht, so daß das Volumen des Belebungsbeckens reduziert bzw. die Wirkung des Belebungsbeckens intensiviert wird. Ein Nach- klarbecken kann möglicherweise entfallen. Wenn aber die Verwendung eines Nachklärbeckens noch erforderlich ist, dann kann dessen Volumen erheblich verringert werden. Gleichzeitig wird dann die Menge zurückzuführenden RucklaufSchlamms gesenkt.This object is achieved in a process of the type mentioned in the introduction in that activated sludge and solids are retained in the drainage area of the activated sludge tank / tanks. In this way, an increase in the activated sludge concentration in the activated sludge tank is achieved, so that the volume of the activated sludge tank is reduced or the effect of the activated sludge tank is intensified. A post-clarification basin can possibly be omitted. However, if the use of a secondary clarifier is still necessary, its volume can be reduced considerably. At the same time, the amount of return sludge to be returned is then reduced.
Die erf i ndungsgemaß zur Durchfuhrung des beschriebenen Verfahrens vorgeschlagene Anlage sieht vor, daß in dem/den Belebungsbecken dem Ablauf ein Abscheider für Belebtschlamm und Feststoffe vorgeschaltet ist.The system proposed according to the invention for carrying out the described method provides that a separator for activated sludge and solids is connected upstream of the outflow in the activation tank (s).
Das Belebungsbecken kann dabei Bestandteil einer Gesamtanlage beliebiger Ausgestaltung sein. Insbesondere können mehrere Belebungsbecken in Reihe oder parallel angeordnet sein. Die Becken können z.B. um ein zentrisch dazu angeordnetes Nachklärbecken liegen. Das Belebungsbecken kann auch als Endlosgraben ausgebildet sein.The activation tank can be part of an overall system of any design. In particular, several aeration tanks can be arranged in series or in parallel. The pools can e.g. around a secondary clarifier arranged centrally. The activation tank can also be designed as an endless trench.
Erfindungsgemaß ist ferner vorgesehen, daß der Abscheider ein Lamel lenabscheider ist. Dabei kann es sich z.B. um Gleichstrom-, Gegenstrom-, Diagonalstrom-, Kreuzstromlamel- lenabscheider handeln, die eine Separierung von Abwasser und Belebtschlamm im Belebungsbecken bewirken. Die Erfindung sieht weiter vor, daß der Ablauf des Belebungsbeckens in ein Nachklärbecken mundet.According to the invention it is further provided that the separator is a lamella separator. These can be, for example, co-current, counter-current, diagonal-flow, cross-flow lamella separators, which separate waste water and activated sludge in the aeration tank. The invention further provides that the process of the aeration tank flows into a secondary clarifier.
Die Erfindung sieht weiter vor, daß zwischen Nachklärbecken und Belebungsbecken eine Ruckfuhrungslei tung für Belebtschlamm vorgesehen ist.The invention further provides that a Ruckfuhrungslei device for activated sludge is provided between secondary clarifier and aeration tank.
Die Erfindung sieht weiter vor, daß das Belebungsbecken Zo- nen zur Vorbehandlung, insbesondere Denitrifi ation und De- phosphati sierung , aufweist.The invention further provides that the aeration tank has zones for pretreatment, in particular denitrification and dephosphatization.
Die Erfindung sieht weiter vor, daß am Ausgang der Dephos- phati sierungszone ein Abscheider für Belebtschlamm und Fest- Stoffe vorgesehen ist und daß diese Zone über eine Ruckfuh- rungsleitung für Belebtschlamm mit dem Nachklärbecken verbunden ist.The invention further provides that a separator for activated sludge and solids is provided at the exit of the dephosphation zone and that this zone is connected to the secondary settling tank via a return line for activated sludge.
Schließlich sieht die Erfindung weiter vor, daß eine Rezir- kulationslei tung vorgesehen ist, welche den Auslaufbereich des Belebungsbeckens mit der Denitrifikationszone verbindet.Finally, the invention further provides that a recirculation line is provided which connects the outlet area of the activated sludge tank to the denitrification zone.
Verfahren und Anlage gemäß vorliegender Erfindung werden nachfolgend anhand von Zeichnungen beispielhaft erläutert. Es zeigt:The method and system according to the present invention are explained below by way of example with reference to drawings. It shows:
Fig. 1 eine schematische Draufsicht auf eine Ausfuhrungsform der erfi ndungsgemaßen Anlage und Fig. 2 einen Teilschmtt durch den Ablaufbereich eines Belebungsbeckens.Fig. 1 is a schematic plan view of an embodiment of the plant according to the invention; and Fig. 2 shows a partial section through the drainage area of an aeration tank.
Das anhand der Figuren nun zu beschreibende Ausfuhrungsbei- spiel hat ein Belebungsbecken 1 und ein Nachklärbecken 2. Das Belebungsbecken 1 ist mit einem Zulauf 4 für Abwasser versehen. Dieses Abwasser gelangt zunächst in eine Dephos- phatierungszone 3, von der es über einen Abscheider 5 für Belebtschlamm und Feststoff in die Denitrifi ationszonen 6,7 gelangt. Im Ausfuhrungsbeispiel ist das Belebungsbecken 1 dem Zulauf 4 gegenüberliegend mit einem Ablauf 8 versehen. Im Bereich des Ablaufs 8 ist im Belebungsbecken 1 ein weiterer Abscheider 9 angeordnet, der anhand der Fig. 2 nachstehend beschrieben wird.The exemplary embodiment now to be described with reference to the figures has an activation tank 1 and a secondary clarification tank 2. The activation tank 1 is provided with an inlet 4 for waste water. This wastewater first reaches a dephosphating zone 3, from which it passes into the denitrification zones 6, 7 via a separator 5 for activated sludge and solid matter. In the exemplary embodiment, the activation tank is 1 opposite the inlet 4 with an outlet 8. In the area of the drain 8, a further separator 9 is arranged in the activation tank 1, which is described below with reference to FIG. 2.
Der Ablauf 8 mündet in das Nachklärbecken 2. Eine Rückführungsleitung 11 führt von dem Nachklärbecken 2 in die De- phosphatierungszone 3 und dient dazu, im Nachklärbecken abgesetzten Schlamm zurückzuführen.The outlet 8 opens into the secondary clarifier 2. A return line 11 leads from the secondary clarifier 2 to the dephosphating zone 3 and serves to return sludge deposited in the secondary clarifier.
Eine Rezi rkulationslei tung 12 geht von dem Bereich unterhalb des Abscheiders 9 im Belebungsbecken 1 aus und führt in die Denitrifikationszonen 6 und 7. Durch die Rezi rkulationslei- tung 12 kann Schlamm in die genannten Zonen zurückgeführt werden.A recirculation line 12 extends from the area below the separator 9 in the activation tank 1 and leads into the denitrification zones 6 and 7. The recirculation line 12 allows sludge to be returned to the zones mentioned.
Der in Fig. 2 im Abi aufbereich des Belebungsbeckens 1 schematisch dargestellte Abscheider 9 ist ein Gleichstromlamellenabscheider, in dem das zu reinigende Abwasser zwischen Leitflächen 13,14 und Lamellen 15,16 nach unten und in Richtung auf den Zulauf 4 geneigt geführt wird. Beim Durchgang des Abwassers durch den Abscheider 9 setzt sich ein großer Teil des im Abwasser enthaltenen Belebtschlamms und der Feststoffe auf den nach oben weisenden Flächen der Lamellen 15,16 und der Leitfläche 14 ab. Von diesen Flächen wiederum gleiten Belebtschlamm und Feststoffe nach unten ab, um unterhalb des Abscheiders 9 abgezogen zu werden.The separator 9 shown schematically in Fig. 2 in the Abi area of the aeration tank 1 is a direct current lamella separator, in which the waste water to be cleaned between guide surfaces 13, 14 and lamellae 15, 16 is guided downwards and in the direction of the inlet 4. When the waste water passes through the separator 9, a large part of the activated sludge and the solids contained in the waste water settles on the upwardly facing surfaces of the fins 15, 16 and the guide surface 14. In turn, activated sludge and solids slide down from these surfaces in order to be drawn off below the separator 9.
Am unteren Ende der Lamellen 15,16 sind Taschen 17 zur Samm- lung von Belebtschlamm und Feststoffen vorgesehen.At the lower end of the fins 15, 16, pockets 17 are provided for collecting activated sludge and solids.
Selbstverständlich kann insbesondere die Zahl der Lamellen den Erfordernissen der jeweiligen Anlage angepaßt werden. Das aus dem Abscheider 9 austretende, zumindest zum Teil gereinigte Abwasser gelangt nach dem Abscheider 9 in Richtung des Pfeils 18 zum Ablauf 8, dann in das Nachklärbecken 2 und aus diesem schließlich gereinigt in eine Abflußrinne 19.Of course, the number of lamellae in particular can be adapted to the requirements of the respective system. The at least partially cleaned wastewater emerging from the separator 9 arrives after the separator 9 in the direction of the arrow 18 to the outlet 8, then into the secondary clarifier 2 and finally cleaned therefrom into a trough 19.
Der in der Dephosphatierungszone 5 vorgesehene Abscheider (5) kann so ausgebildet sein wie der in Fig. 2 dargestellte. Es kann aber auch hier jeder für die Abscheidung ähnlicher Feststoffe bekannte Abscheider zum Einsatz kommen.The separator (5) provided in the dephosphatization zone 5 can be designed as that shown in FIG. 2. However, any separator known for separating similar solids can also be used here.
Das in Fig. 1 beschriebene Belebungsbecken kann dadurch ohne weiteres variert werden, daß in Anbetracht der jeweiligen Beschaffenheit des Abwassers die Dephosphatierungszone und/oder die Denitrifikationszonen weggelassen oder verändert werden. In gleicher Weise kann auch das beschriebene Nachklärbecken unter Umständen entfallen oder aber durch ein anders ausgebildetes Nachklärbecken ersetzt werden.The aeration tank described in FIG. 1 can be easily varied by omitting or changing the dephosphation zone and / or the denitrification zones in view of the particular nature of the waste water. In the same way, the secondary clarifier described can also be dispensed with under certain circumstances, or it can be replaced by another secondary clarifier.
Als Abscheider können auch andere Bauformen verwendet werden, wie sie dem Fachmann für die Rückhaltung von Feststoffen bekannt sind.Other designs can also be used as separators, as are known to the person skilled in the art for the retention of solids.
Erfindungsgemäß werden also multifunktional und simultan Abwasserreinigung, Belebtstoffschlämm- und Feststoffrückhal- tung und damit Feststoffanreicherung bis in hohe Konzentrationsbereiche erreicht. Die Rückführung von Rücklaufschlamm aus einem Nachklärbecken wird erheblich redu- ziert oder kann in manchen Fällen vollkommen entfallen. Gegenüber einer sonst üblichen RücklaufSchlammförderung von 100% wird somit die Zu! aufkonzentration des Abwassers nicht um 50% verdünnt. Die effektive Aufenthaltszeit des Abwassers im Reaktor, also dem Belebungsbecken, wird bei gleicher Schmutzfracht-Raumbelastung bis zu 70% erhöht, in manchen Fällen sogar verdoppelt. Da aber die biologischen Umsetzungsprozesse mit höheren Konzentrationen an Schmutzstoffen exponentiell schneller ablaufen, ergeben sich beim erfindungsgemäßen Verfahren höhere Abbaugeschwindigkeiten und daraus resultierend deutlich bessere Wirkungsgrade.According to the invention, multifunctional and simultaneous wastewater purification, activated sludge and solids retention and thus solids accumulation are achieved up to high concentration ranges. The return of return sludge from a secondary settling basin is considerably reduced or in some cases can be completely eliminated. Compared to the usual return sludge production of 100%, the Zu! concentration of waste water not diluted by 50%. The effective residence time of the wastewater in the reactor, i.e. the activation tank, is increased by up to 70%, in some cases even doubled, with the same pollution load. However, since the biological implementation processes run exponentially faster with higher concentrations of contaminants, the result of the Process according to the invention higher degradation speeds and, as a result, significantly better efficiencies.
Verfahren und Anlage ermöglichen den Einsatz kleiner Bele- bungsbeckenvolumen bei gleichen Leistungen wie konventionelle Verfahren und Anlagen.The process and plant enable the use of small aeration tanks with the same performance as conventional processes and plants.
Das Nachklärbeckenvolumen kann entsprechend der reduzierten Schlammvolumenbeschickung erheblich reduziert werden und in besonderen Fällen vollkommen entfallen.The secondary clarifier volume can be significantly reduced in accordance with the reduced sludge volume feed and can be completely eliminated in special cases.
Wenn mit mehreren in Reihe geschalteten Belebungsbecken gearbeitet wird, dann kann eine Zwischenklärung in der Regel entfal len . If you work with several aeration tanks connected in series, an intermediate clarification can usually be omitted.

Claims

Ansprüche Expectations
1. Verfahren zur biologischen und biologisch-chemischen Aufbereitung von Abwasser unter Einsatz von Belebtschlamm in einem Belebungsbecken (1), dadurch gekennzeichnet, daß im Ablaufbereich des Belebungsbeckens / der Belebungsbecken (1) Belebtschlamm und Feststoffe zurückgehalten werden.1. A method for the biological and biological-chemical treatment of waste water using activated sludge in a activated sludge tank (1), characterized in that activated sludge and solids are retained in the drainage area of the activated sludge tank / the activated sludge tank (1).
2. Anlage zur Durchführung des Verfahrens nach Anspruch 1, mit mindestens einem Belebtschlamm enthaltenden Belebungsbecken (1), das einen Zulauf (4) und einen Ablauf2. Plant for performing the method according to claim 1, with at least one activated sludge-containing activated sludge tank (1) having an inlet (4) and an outlet
(8) aufweist, dadurch gekennzeichnet, daß in dem/den Belebungsbecken (1) dem Ablauf (8) ein(8), characterized in that in the / the activation tank (1) the outlet (8)
Abscheider (9) für Belebtschlamm und Feststoffe vorgeschaltet ist.Separator (9) for activated sludge and solids is connected upstream.
3. Anlage nach Anspruch 1, dadurch gekennzeichnet, daß der Abscheider (9) ein Lamellenabscheider ist.3. Plant according to claim 1, characterized in that the separator (9) is a lamella separator.
4. Anlage nach Anspruch 2 oder 3, dadurch gekennzeichnet, daß der Ablauf (8) des Belebungsbeckens (1) in ein Nachklärbecken (2) mündet,4. Plant according to claim 2 or 3, characterized in that the outlet (8) of the activated sludge tank (1) opens into a secondary settling tank (2),
5. Anlage nach Anspruch 4, dadurch gekennzeichnet, daß zwischen Nachklärbecken (2) und Belebungsbecken (1) eine5. Plant according to claim 4, characterized in that between the clarifier (2) and aeration tank (1)
Rückführungsleitung für Belebtschlamm vorgesehen ist.Return line for activated sludge is provided.
6. Anlage nach einem der Ansprüche 2 bis 5, dadurch gekennzeichnet, daß das Belebungsbecken (1) Zonen zur Vorbehandlung (3,6,7), insbesondere Denitrifikation und Dephosphatisierung, aufweist. 6. Plant according to one of claims 2 to 5, characterized in that the activation tank (1) zones for pretreatment (3,6,7), in particular denitrification and dephosphatization.
7. Anlage nach Anspruch 6, dadurch gekennzeichnet, daß am Ausgang der Dephosphatisierungszone (3) ein Abscheider (5) für Belebtschlamm und Feststoffe vorgesehen ist und daß diese Zone über eine Rückführungsleitung (11) für Belebtschlamm mit dem Nachklärbecken (2) verbunden ist.7. Plant according to claim 6, characterized in that a separator (5) for activated sludge and solids is provided at the exit of the dephosphatization zone (3) and that this zone is connected via a return line (11) for activated sludge to the secondary settling tank (2).
8. Anlage nach Anspruch 6 oder 7, dadurch gekennzeichnet, daß eine Rezi rkulationslei tung (12) vorgesehen ist, welche den Ausl aufbereich des Belebungsbeckens (1) mit der Denitrifikationszone (6,7) verbindet. 8. Plant according to claim 6 or 7, characterized in that a Rezi rkulationslei device (12) is provided which connects the outlet area of the activated sludge tank (1) with the denitrification zone (6,7).
PCT/DE1997/002404 1996-10-25 1997-10-18 Method for the biological and biological-chemical treatment of waste water and plant for carrying out this method WO1998018729A1 (en)

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DE19800664C2 (en) * 1997-07-11 2002-04-11 Shw Hoelter Wassertechnik Gmbh Process for biological wastewater treatment and installation for carrying out the process
DE19842884C2 (en) * 1998-09-18 2002-06-20 Bernd Diering Process for the biological and biological-chemical treatment of waste water with an integrated sludge separator
DE19938016A1 (en) * 1999-08-11 2001-02-22 Messer Griesheim Gmbh Method and device for biological wastewater treatment
DE19939679C2 (en) * 1999-08-20 2002-02-14 Gke Consult Beratende Ingenieu Waste water purification device with accumulation of solids
DE19962793A1 (en) * 1999-12-23 2001-07-05 Axel Johnson Engineering Gmbh Device and method for biological wastewater treatment

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GB1375458A (en) * 1971-09-28 1974-11-27
EP0048630A1 (en) * 1980-09-24 1982-03-31 Nealvane Limited Treatment of sewage
EP0383674A1 (en) * 1989-02-14 1990-08-22 Omnium De Traitements Et De Valorisation (Otv) Process and installation for the biological treatment of waste water containing nitrogen, especially for nitrification and/or denitrification
DE4329239A1 (en) * 1993-08-26 1995-03-02 Ivan Prof Dr Ing Sekoulov Process and apparatus for biological waste water purification

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1375458A (en) * 1971-09-28 1974-11-27
EP0048630A1 (en) * 1980-09-24 1982-03-31 Nealvane Limited Treatment of sewage
EP0383674A1 (en) * 1989-02-14 1990-08-22 Omnium De Traitements Et De Valorisation (Otv) Process and installation for the biological treatment of waste water containing nitrogen, especially for nitrification and/or denitrification
DE4329239A1 (en) * 1993-08-26 1995-03-02 Ivan Prof Dr Ing Sekoulov Process and apparatus for biological waste water purification

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