EP0000861B1 - Procédé de purification d'eau résiduaire chargée en impuretés organiques et contenant du calcium - Google Patents

Procédé de purification d'eau résiduaire chargée en impuretés organiques et contenant du calcium Download PDF

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Publication number
EP0000861B1
EP0000861B1 EP19780100051 EP78100051A EP0000861B1 EP 0000861 B1 EP0000861 B1 EP 0000861B1 EP 19780100051 EP19780100051 EP 19780100051 EP 78100051 A EP78100051 A EP 78100051A EP 0000861 B1 EP0000861 B1 EP 0000861B1
Authority
EP
European Patent Office
Prior art keywords
purification
activated sludge
value
calcium
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.)
Expired
Application number
EP19780100051
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German (de)
English (en)
Other versions
EP0000861A1 (fr
Inventor
Hans Dr. Reimann
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.)
Linde GmbH
Original Assignee
Linde 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 Linde GmbH filed Critical Linde GmbH
Publication of EP0000861A1 publication Critical patent/EP0000861A1/fr
Application granted granted Critical
Publication of EP0000861B1 publication Critical patent/EP0000861B1/fr
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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
    • C02F3/02—Aerobic processes
    • C02F3/12—Activated sludge processes
    • C02F3/26—Activated sludge processes using pure oxygen or oxygen-rich gas
    • 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 process for purifying calcium-containing, organically contaminated wastewater by means of an activated sludge process with aeration with almost pure oxygen and / or with an oxygen-containing gas, in which a CO 2 -containing gas is converted into the in the aeration system in order to convert calcium hydroxide to calcium carbonate existing liquid is introduced.
  • Calcium-containing, organically branched wastewater is particularly common in sugar production.
  • the sugar industry has recently been using activated sludge processes for the purification of such waste water either instead of or in connection with the use of stacking ponds and oxidation ponds.
  • a wastewater treatment process is known in which the floating and washing water accumulating in the sugar factory is circulated through a settling basin and the sludge transport water coming from the settling basin is first fed to an onshore basin and an anaerobic basin and then to a fermenter with a downstream secondary clarification basin. Sludge settled in the secondary clarifier is transported back into the fermenter, while purified water drawn off from the secondary clarifier can be returned to the settling basin of the wash and wash water circuit or fed to a receiving water.
  • the fermenter can be operated with air or at least with oxygen-enriched air (see special print from the magazine "Zucker", 28th year, volume 10, pages 527 to 534, 1975).
  • a decrease in the bacterial growth in the activated sludge system and thus a low degradation capacity can be caused by the fact that the wastewater accumulating in the settling basin of the wash and wash water circuit is due to the usually more or less high additions of calcium hydroxide (Ca (OH) 2 ) in the wash and water cycle to avoid undesirable bacterial growth in this cycle is strongly alkaline, pH values of up to 12 being achievable.
  • Ca (OH) 2 calcium hydroxide
  • the invention has for its object to develop a method for purifying calcium-containing wastewater, in particular from the highest possible degradation performance can be achieved.
  • This object is achieved in that the introduction of CO 2 is carried out to the extent that the pH in the activation system is set between 6 and 8 and the concentration of activated sludge dry substance is above 8 kg / m 3 and the proportion of the organic substance therein. defined as loss on ignition at 30 to 70%, preferably at 40 to 60%.
  • the activated sludge is weighted with the aid of calcium carbonate precipitated by the introduction of a CO 2 -containing gas, which leads to an increase in the concentration of the activated sludge dry substance, which generally indicates the proportion by weight of undissolved substances in a solid water mixture.
  • the process according to the invention is advantageously carried out such that the pH in the activation system is adjusted to a value between 6.5 and 7.5 by the introduction of the CO 2 -containing gas.
  • the pH in the activation system is adjusted to a value between 6.5 and 7.5 by the introduction of the CO 2 -containing gas.
  • Waste water from the wash and wash water circuit of a sugar factory was taken from the drain of the mechanical sedimentation basin and sent to a semi-technical biological plant.
  • the BOD 5 of the feed was 12000 mg / I, the COD 17000 mg / I, the pH 10-12 and the Ca content 3000 mg / I.
  • the aeration tank of the plant was initially filled with activated sludge from a municipal wastewater treatment plant, which was characterized by a dry matter concentration of 4 mg / m 3 , a loss on ignition of 80% and a sludge index of 100 ml / g.
  • a gas containing 60-70% O 2 and 30-40% CO 2 was introduced into the activation tank. This resulted in a pH of 6.5-7 in the pool.
  • the dry matter concentration increased rapidly in the course of a short time and reached values of 20 to 40 kg / m 3 with a loss on ignition of 40-50% and a sludge index of 20-50 ml / g.
  • BOD 5 room load of 5-10 kg / m 3 . d and a corresponding nominal aeration time of 30-60 hours
  • BOD 5 values of 150-300 mg / 1 and COD values of 600-1200 mg / I were measured in the secondary clarifier.
  • the Ca content of the drain was 600 mg / I, so it had decreased by 2400 mg / I, which corresponds to a precipitated amount of 6000 mg / I CaC0 3 .
  • the CaC0 3 practically completely changes to 3350 mg / lCaO.
  • About 2500 mg / I of excess sludge with an organic content of approx. 70% is produced from 12000 mg / I BOD S.
  • the table below shows that in this way a sludge with an organic content of approx. 21% and a loss on ignition (previously defined as organic substance) of approx. 50% was formed.
  • the inorganic part causes the good flocculation and settling properties.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Microbiology (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Organic Chemistry (AREA)
  • Analytical Chemistry (AREA)
  • Activated Sludge Processes (AREA)
  • Separation Of Suspended Particles By Flocculating Agents (AREA)

Claims (2)

1. Procédé de purification d'eaux résiduaires renfermant du calcium et chargées d'impuretés organiques, par mise en oeuvre d'un procédé utilisant de la boue activée et utilisant un barbotage d'oxygène sensiblement pur ou de gaz renfermant de l'oxygène, dans lequel un gaz renfermant du C02 est introduit dans le liquide présent dans le système d'activation en vue de la transformation, part transposition, de l'hydroxyde de calcium en carbonate de calcium, caractérisé en ce que le C02 est introduit dans une proportion telle que le pH du système d'activation soit ajusté à une valeur comprise entre 6 et 8, que la concentration de substance sèche de la boue activée soit maintenue à une valeur supérieure à 8 kg/m3, et que la proportion des substances organiques présentes, définie en perte au feu, soit maintenue à une valeur comprise entre 30 et 70%, de préférence entre 40 et 60%.
2. Procédé selon la revendication 1, caractérisé en ce que le pH est réglé à une valeur comprise entre 6.5 et 7,5.
EP19780100051 1977-08-25 1978-06-01 Procédé de purification d'eau résiduaire chargée en impuretés organiques et contenant du calcium Expired EP0000861B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2738309 1977-08-25
DE19772738309 DE2738309A1 (de) 1977-08-25 1977-08-25 Verfahren zur reinigung calcium enthaltenden, organisch belasteten abwassers

Publications (2)

Publication Number Publication Date
EP0000861A1 EP0000861A1 (fr) 1979-03-07
EP0000861B1 true EP0000861B1 (fr) 1981-08-12

Family

ID=6017266

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19780100051 Expired EP0000861B1 (fr) 1977-08-25 1978-06-01 Procédé de purification d'eau résiduaire chargée en impuretés organiques et contenant du calcium

Country Status (6)

Country Link
US (1) US4227998A (fr)
EP (1) EP0000861B1 (fr)
BR (1) BR7805506A (fr)
DE (1) DE2738309A1 (fr)
IT (1) IT1098172B (fr)
ZA (1) ZA784822B (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL7906426A (nl) * 1979-08-27 1981-03-03 Gist Brocades Nv Werkwijze voor het zuiveren van afvalwater.
DE3202212A1 (de) * 1982-01-25 1983-08-04 Süddeutsche Zucker AG, 6800 Mannheim Verfahren zum anaeroben abbau von calciumionenhaltigen, alkalischen schwemm- und waschwaessern
DE3917415C2 (de) * 1989-05-29 1999-01-14 Linde Ag Verfahren zur Reinigung von Abwasser
GB9425110D0 (en) * 1994-12-13 1995-02-08 Boc Group Plc Sewage respiration inhibition
DE10062878A1 (de) * 2000-12-16 2002-06-27 Messer Griesheim Gmbh Verfahren zur biologischen Abwasserreinigung

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2196840A (en) * 1935-10-11 1940-04-09 Micajah T Singleton Sewage treatment
DE1484838A1 (de) * 1964-02-04 1969-06-04 Metallgesellschaft Ag Verfahren zum Behandeln von Zentrifugat,das bei der Entwaesserung von Klaerschlamm mittels Dekantier-Zentrifugen anfaellt
US3356609A (en) * 1966-05-03 1967-12-05 United Carbide Corp Aerobic treatment of sewage
US3440166A (en) * 1967-06-13 1969-04-22 North American Rockwell Waste treatment process with recycling flocculating agents
US3546111A (en) * 1968-05-13 1970-12-08 Ethyl Corp Waste treatment
US3640820A (en) * 1969-08-22 1972-02-08 Nalco Chemical Co Sewage treatment process
US3947350A (en) * 1972-10-30 1976-03-30 Envirotech Corporation Process of preparing sewage sludge for dewatering
CS181403B1 (en) * 1974-12-22 1978-03-31 Svatopluk Mackrle Method and device for with organic substances strongly polluted waste water treatment in industry and agriculture
DE2535837C3 (de) * 1975-08-12 1984-09-13 Bayer Ag, 5090 Leverkusen Verfahren zur biologischen Behandlung von Abwasser in einer Kaskade

Also Published As

Publication number Publication date
ZA784822B (en) 1979-08-29
IT1098172B (it) 1985-09-07
EP0000861A1 (fr) 1979-03-07
US4227998A (en) 1980-10-14
DE2738309A1 (de) 1979-03-15
BR7805506A (pt) 1979-04-17
IT7826869A0 (it) 1978-08-21

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