DE3300544A1 - Process for improving the settling behaviour of septic sludge - Google Patents

Process for improving the settling behaviour of septic sludge

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Publication number
DE3300544A1
DE3300544A1 DE19833300544 DE3300544A DE3300544A1 DE 3300544 A1 DE3300544 A1 DE 3300544A1 DE 19833300544 DE19833300544 DE 19833300544 DE 3300544 A DE3300544 A DE 3300544A DE 3300544 A1 DE3300544 A1 DE 3300544A1
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DE
Germany
Prior art keywords
digested sludge
withdrawn
pure oxygen
fumigated
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.)
Withdrawn
Application number
DE19833300544
Other languages
German (de)
Inventor
Dietrich von Dipl.-Phys. Dr. 6200 Wiesbaden Borries
Rainer Dipl.-Chem. Dr. 6237 Liederbach Frische
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.)
Borries dietrich Von dipl-Physdr
Original Assignee
Borries dietrich Von dipl-Physdr
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 Borries dietrich Von dipl-Physdr filed Critical Borries dietrich Von dipl-Physdr
Priority to DE19833300544 priority Critical patent/DE3300544A1/en
Publication of DE3300544A1 publication Critical patent/DE3300544A1/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Withdrawn legal-status Critical Current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
    • C02F3/1221—Particular type of activated sludge processes comprising treatment of the recirculated sludge
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
    • C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
    • C02F1/467—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction
    • C02F1/4672—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction by electrooxydation
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/72—Treatment of water, waste water, or sewage by oxidation
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/72—Treatment of water, waste water, or sewage by oxidation
    • C02F1/76—Treatment of water, waste water, or sewage by oxidation with halogens or compounds of halogens
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00—Treatment of sludge; Devices therefor
    • C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
    • 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
    • C02F3/20—Activated sludge processes using diffusers
    • C02F3/208—Membrane aeration
    • 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
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/72—Treatment of water, waste water, or sewage by oxidation
    • C02F1/722—Oxidation by peroxides
    • 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)
  • Water Supply & Treatment (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Organic Chemistry (AREA)
  • Microbiology (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Treatment Of Sludge (AREA)
  • Treatment Of Water By Oxidation Or Reduction (AREA)

Abstract

Septic sludge from the anaerobic stabilisation of sewage sludge generally has an unfavourable settling behaviour. Processes are described for improving the settling behaviour which are based on simple and hygienically safe measures.

Description

GitelGitel

Verfahren zur Verbesserung des Absetzverhaltens von Faulschlamm Verfahrensbeschreibung: Die vorliegende Erfindung betrifft die Verbesserung des Absetzverhaltens von Faulschlamm durch oxidative Behandlung desselben mittels chemischer Oxidationsmittel oder elektrochemischer Anhebung des Redoxpotentials. Auf diese Weise werden die anaeroben Bakterien des Faulschlamms inaktiviert und dadurch ihr Absetzverhalten verbessert.Process to improve the settling behavior of digested sludge Process description: The present invention relates to improving the settling behavior of digested sludge by oxidative treatment of the same by means of chemical oxidizing agents or electrochemical Raising the redox potential. In this way, the anaerobic bacteria of the Inactivated digested sludge and thereby improves its settling behavior.

Es ist bekannt, daß bei der biologischen Abwasserbehandlung große Mengen Klärschlamm (Primärschlamm, Überschußschlämme der Belebung, Tropfkörperschlamm) anfallen, deren Verwertung oder schadlose Beseitigung erheblichen technischen Aufwand erfordert. Ein wichtiges Verfahren der Klärschlammbehandlung ist die anaerabe Stabilisierung, bei der unter Sauerstoffabschluß eine Methangärung erfolgt, durch die zugleich Faulgase erzeugt werden (überwiegend CE4 und C02) und weitgehende Stabilität gegen weitere Faulprozesse mit ihren unerwünschten Wirkungen erreicht wird.It is known that in biological wastewater treatment large Quantities of sewage sludge (primary sludge, excess sludge from aeration, trickling filter sludge) incurred, their recovery or damage-free disposal considerable technical effort requires. An important method of sewage sludge treatment is the anaerobic stabilization, in which methane fermentation takes place in the absence of oxygen, through which fermentation gases at the same time (mainly CE4 and C02) and extensive stability against others Lazy processes with their undesirable effects is achieved.

Verwertung oder Beseitigung des gefaulten Schlamms erfolgt, ggf. nach Behandlung in Eindickern, im wesentlichen auf den folgenden Wegen: - direkte landwirtschaftliche Verwertung - Zwischenlagerung zur späteren landwirtschaftlichen Verwertung - Entwässerung und Kompostierung - Entwässerung und Deponierung - Entwässerung und Verbrennung Die Entwässerung erfolgt in der Regel durch Kammerfilterpressen, Siebbandpressen oder Zentrifugen, wobei vielfach Flockungshilfsmittel" zugesetzt werden.Recovery or disposal of the digested sludge takes place, if necessary after Treatment in thickeners, essentially in the following ways: - direct agricultural Utilization - interim storage for later agricultural utilization - drainage and composting - drainage and landfill - drainage and incineration The dewatering is usually done by chamber filter presses, belt filter presses or centrifuges, where often flocculants "added will.

Der Entwässerungsaufwand ist umso geringer, je höher der Trockensubstanzgehalt des ggf. im Eindicker vorkonzentrierten Schlamms ist. Bei der landwirtschaftlichen Verwertung mit und ohne Zwischenlagerung wirkt sich hoher Trockensubstanzgehalt günstig auf Speichervolumen und Transportkosten aus.The dewatering effort is lower, the higher the dry matter content of the sludge that may have been pre-concentrated in the thickener. In the case of agricultural Recycling with and without intermediate storage has a high dry matter content favorably on storage volume and transport costs.

Faulschlamm hat im allgemeinen ein schlechtes Absetzverhalten; selbst nach längerer Zeit können meist nur geringe Trübwassermengen abgezogen werden, die ihrerseits noch erhebliche Trockensubstanzgehalte aufweisen, welche die Kläranlage erneut belasten.Digested sludge generally has poor settling behavior; self after a long period of time only small amounts of cloudy water can usually be withdrawn in turn still have considerable dry matter contents, which the sewage treatment plant load again.

Die technische Aufgabe besteht darin, durch verbessertes Absetzverhalten von Faulschlamm eine möglichst weitgehende Vorentwässerung des Faulschlamms zu erreichen, um auf diese Weise Flockungsmittel und/ oder Stapelraum und/oder Transportkapazität sowie Energie für Transporte und Entwässerungsmaschinen zu sparen, Die dazu eingesetzten Mittel dürfen bei nicht kontaminierten Schlämmen deren landwirtschaftliche Verwertung nicht behindern.The technical task is to improve the settling behavior to achieve the most extensive possible pre-dewatering of the digested sludge from digested sludge, in this way flocculant and / or stacking space and / or transport capacity as well as to save energy for transports and dewatering machines, which are used for this In the case of uncontaminated sludge, funds may be used for agricultural purposes do not hinder.

Die Lösung dieser Aufgabe besteht hier in der oxidativen Behandlung von Faulschlamm mittels chemischer oder elektrochemischer Oxidationsmittel.The solution to this problem is the oxidative treatment digested sludge using chemical or electrochemical oxidizing agents.

Auf diese Weise wird das Absetzverhalten verbessert, ohne daß Stoffe in den Schlamm geraten, die der weiteren Verwertung oder Deponierung entgegenstehen; insbesondere erfolgt keine nennenswerte Erhöhung der Trockensubstanzmenge.In this way, the settling behavior is improved without any substances get into the sludge, which prevent further recycling or landfilling; in particular, there is no significant increase in the amount of dry matter.

Ds verbesserte Absetzverhalten äußert sich in 1) der 1>rzielung einer großen Absetzgeschwindigkeit f der erreichung eines höheren Feststoffgehalts im abgesetzten Schlamm §) der Herabsetzung des Feststoff- und Trockensubstanzgehalts des Trübwassers.The improved weaning behavior manifests itself in 1) the 1> achievement a high settling rate f the achievement of a higher solids content in the settled sludge §) the reduction of the solid and dry matter content of cloudy water.

Im Vergleich zu einer Verbesserung des Absetzverhaltens durch andere Verfahren, z.B. rasche Abkühlung des Faulschlamms über Wärmetauscherund Kältemaschinen, ermöglicht die Erfindung ein wesentlich einfacheres Vorgehen, da nur preiswerte Chemikalien und einfache Mischeinrichtungen sowie ggf. Elektroden benötigt werden. Beispielsweise erfordert die kontinuierliche oder chargenweise Mischung von Faulschlamm mit Wasserstoffperoxidlösung nur einfache Misch- und Dosiereinrichtungen.Compared to an improvement in weaning behavior by others Process, e.g. rapid cooling of digested sludge using heat exchangers and refrigeration machines, the invention enables a much simpler procedure, since it is only inexpensive Chemicals and simple mixing devices and possibly electrodes are required. For example, requires continuous or batch mixing of digested sludge with hydrogen peroxide solution only simple mixing and dosing devices.

Claims (12)

PatentansSrüc,he,..Patent claims, he, .. Das Verfahren zur Verbesserung des Absetzverhaltens von Faulschlamm ist dadurch gekennzeich net, daß der Faulschlamm nach Entnahme aus dem Faulbehälter mit chemischen Oxidationsmitteln oder durch elektrochemische Anhebung des Redoxpotentials behandelt wird.The process to improve the settling behavior of digested sludge is characterized in that the digested sludge is removed from the digester with chemical oxidizing agents or by electrochemical raising of the redox potential is treated. 2) Verfahren nach 1) dadurch gekennzeichnet, daß der abgezogene Faulschlamm vor dem Eindicken mit Luft begast wird.2) Method according to 1), characterized in that the digested sludge withdrawn is fumigated with air before thickening. 3) Verfahren nach 1) dadurch gekennzeichnet, daß der abgezogene Faulschlamm vor dem Eindicken mit reinem Sauerstoff begast wird.3) Method according to 1), characterized in that the digested sludge withdrawn is fumigated with pure oxygen before thickening. 4) Verfahren nach 1) dadurch gekennzeichnet, daß in den Faulschlamm zur Vermeidung von Blasenbildung und Gerüchen reiner Sauerstoff über semipermeable Membranen eingetragen wird.4) Method according to 1), characterized in that in the digested sludge to avoid the formation of bubbles and odors pure oxygen over semipermeable Membranes is entered. 5) Verfahren nach 1) dadurch gekennzeichnet, daß der Eintrag von reinem Sauerstoff über poröse Sauerstoffkerzen ohne Blasenbildung (Ultraschallablösung) erfolgt.5) Method according to 1), characterized in that the entry of pure Oxygen via porous oxygen candles without bubble formation (ultrasonic detachment) he follows. 6) Verfahren nach 1) dadurch ~gekennzeichnet, daß Wasserstoffperoxidlösung unter mäßigem Druck und mit rascher Vermischung dem Faulschlamm zugemischt wird.6) Method according to 1) characterized ~ in that hydrogen peroxide solution is mixed with the digested sludge under moderate pressure and with rapid mixing. 7) Verfahren nach 1) dadurch gekennzeichnet, daß dem Faulschlamm geeignete Peroxihydrate oder Lösungen solcher Peroxihydrate unter intensiver Mischung zugefügt werden.7) Method according to 1), characterized in that the digested sludge is suitable Peroxyhydrates or solutions of such peroxyhydrates are added with intensive mixing will. 8) Verfahren nach 1) dadurch gekennzeichnetf daß der abgezogene Faulschlamm mit Luft oder reinem Sauerstoff als Bauptoxidationsmittel unter Zusatz von Ozon begast wird.8) Method according to 1) characterized in that the digested sludge withdrawn with air or pure oxygen as a structural oxidizer with the addition of ozone is fumigated. 9) Verfahren nach 1) dadurch gekennzeichnet, daß in den abgezogenen Faulschlainm Ozon als Oxidationsmittel eingetragen wird.9) Method according to 1), characterized in that in the withdrawn Putrid ozone is entered as an oxidizing agent. 10) Verfahren nach 1) dadurch gekennzeichnet, daß der abgezogene Faulschlamm mit einer Permanganatlösung vermischt wird.10) Method according to 1), characterized in that the digested sludge withdrawn is mixed with a permanganate solution. 11) Verfahren nach 1) dadurch gekennzeichnet, daß der abgezogene Faulschlamm an Bleidioxidelektroden vorbeiströmt, die unter Stromdurchang ein stark oxidierendes Milieu erzeugen (HO3+).11) Method according to 1), characterized in that the digested sludge withdrawn flows past lead dioxide electrodes, which under current flow a strongly oxidizing Create environment (HO3 +). 12) Verfahren nach 1) dadurch gekennzeichnet, daß im Eindicker das Redoxpotential durch schwache i!;lektrolyse angehoben wird.12) Method according to 1), characterized in that the thickener Redox potential is raised by weak electrolysis.
DE19833300544 1983-01-10 1983-01-10 Process for improving the settling behaviour of septic sludge Withdrawn DE3300544A1 (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0251221A2 (en) * 1986-06-28 1988-01-07 Brösamle, Peter, Dipl.-Ing. Process for organic sludge treatment
FR2701704A1 (en) * 1993-02-17 1994-08-26 Environ Resources Management Process for the treatment of organic waste by oxidation
DE10112934A1 (en) * 2001-03-12 2002-10-02 Berliner Wasserbetriebe Procedures for avoiding and removing incrustations during the conveyance and discharge of liquids

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0251221A2 (en) * 1986-06-28 1988-01-07 Brösamle, Peter, Dipl.-Ing. Process for organic sludge treatment
EP0251221A3 (en) * 1986-06-28 1988-09-21 Peter Brosamle Process for organic sludge treatment
FR2701704A1 (en) * 1993-02-17 1994-08-26 Environ Resources Management Process for the treatment of organic waste by oxidation
NL9301151A (en) * 1993-02-17 1994-09-16 Environ Resources Management Method for treating waste using oxidation.
DE10112934A1 (en) * 2001-03-12 2002-10-02 Berliner Wasserbetriebe Procedures for avoiding and removing incrustations during the conveyance and discharge of liquids
DE10112934B4 (en) * 2001-03-12 2004-08-26 Berliner Wasserbetriebe Anstalt des öffentlichen Rechts Procedures for avoiding and removing incrustations when pumping and draining liquids

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