CN86101140A - Process for purifying waste water - Google Patents

Process for purifying waste water Download PDF

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Publication number
CN86101140A
CN86101140A CN86101140.6A CN86101140A CN86101140A CN 86101140 A CN86101140 A CN 86101140A CN 86101140 A CN86101140 A CN 86101140A CN 86101140 A CN86101140 A CN 86101140A
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stage
mud
absorption phase
waste water
transported
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CN1015887B (en
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伯索·伯恩克
伯恩德·迪伦格
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    • 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
    • C02F3/1205—Particular type of activated sludge processes
    • C02F3/121—Multistep 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
    • C02F3/30—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)
  • Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
  • Treatment Of Biological Wastes In General (AREA)

Abstract

The present invention is a process for purifying waste water, and waste water activates through the high loading of absorption phase earlier.Mud is discharged in clarification again, arrives the underload activation stage subsequently, discharges mud and arrives the final clarification stage again.
Microorganism is in absorption phase work, and low load stage is carried out nitrification and denitrification.Waste water through anaerobic treatment, flows into intermediate clarifier before by aerobic treatment in absorption phase.The mud of discharging can circulate back, also can drain to concentrate.The water that produces when mud concentrates and during sludge dewatering will add precipitation agent before being transported to the filter tank water-in handles.

Description

Process for purifying waste water
On kind, the present invention is relevant waste water, particularly the method for sanitary wastewater purification.The waste water that need purify at first is transported to the activation stage of high loading, and it is handled as absorption phase.By an intermediate clarifier, mud is concentrated then.The last stage that is transported to underload again is connected with the final clarification stage in this stage, and mud is separated,
Wherein, the anaerobion of selection carries out work in absorption phase.Be removed at middle clarification stage mud, so that keep sludge quantity in the starting stage.Low load stage is carried out nitrated, then carries out denitrification, and the mud of intermediate clarifier adds absorption phase to as circulating sludge, and the mud in principal defecation stage also can be used as the circulating sludge circulation and enters into low load stage.Excess sludge is discharged and concentrated.The biological stage of " absorption phase " expression is the activation stage of high loading, promptly has following parameter:
Volume load Lv=2-20 kilogram BOD 5/ rice 3My god
Dry matter content DSv=1-10 kilogram/rice 3My god
Dewatered sludge load L DSBe equal to or greater than 2 kilograms of BOD 5/ kilogram DS days
On the other hand, the parameter of low load stage operation is:
Volume load L v=0.50-1.50 kilogram BOD 5/ rice 3My god
Dry matter content DS v=2-5 kilogram/rice 3My god, and
Dewatered sludge load L DSBe equal to or less than 0.50 kg/kg DS days,
Dewatered sludge load L preferably DS=0.15 kilogram of BOD 5/ kilogram DS days.
The present invention is from the known characteristics of A level engineering practice (German Patent 2640875) in this respect.Low load stage can be an activation pond, also can be that trickling filter adds the activation pond.As a principle (but need not to be necessary), to carry out the separation of bacterial population between absorption phase and the low load stage exactly, do not carry out when particularly will also turn back to absorption phase at the mud of low load stage.Term " stage " also comprises several activation ponds, the combination of equipment such as some trickling filters, but in fact it perhaps move with Same Way in each stage with the Same Way operation.
Adopt known common technology just can remove phosphorus (German offenlegungsschrift2640875).In the mud dry weight amount of being discharged, the content of phosphorus accounts for 1-4% greatly, thinks that this is the level that A level technology tradition is removed phosphorus.Bigger if desired phosphorus is removed level, just requires to adopt other way, is well-known phosphorus elution processes (United States Patent (USP) 3236766,4042493,4141822), in this technology, the part circulating sludge is by an anaerobic digester, and the way of water flushing makes the phosphorus wash-out.Remove the phosphorus of eluting water with the method for lime precipitation.Also knowing in addition has Bardenpho technology (United States Patent (USP) 3964998), and this relates to the technology of biological removal nitrogen and phosphorus.Mutually placed in-line five stages that operate in of this technology are with dissimilar or carry out in zone, different pond.Provide removal phosphorus necessary anaerobic condition in the fs.Because circulating sludge also is back to the fs, so must be noted that in the mud and can not contain nitrate.Formed nitrate is delivered to first anoxic pond with returned sluge and is carried out denitrification in first aeration tank, delivers to aeration phase then.Quantity of reflux approximately is 400%.Through this circulation, the mixed solution of waste water and active sludge is transported to second anoxic stage, and remaining nitrate is carried out denitrification.For fear of the anaerobic conditions in the final clarification stage, with the precipitation ability of improving mud and the small bubbles of removing adhesion nitrate, second aeration phase is necessary.In aeration process, to contain dissolved oxygen certainly in the waste water that desire is handled.Under the anoxic working conditions, although find no longer that in the waste water that desire is handled dissolved oxygen is arranged, it is with NO 3Or NO 2Combining form exist.Not only do not having dissolved oxygen but also do not having with NO 3Or NO 2The situation of the oxygen that exists of combining form under, anaerobic condition could exist.
This is the basic problem of this invention, also is the problem that is faced than the more efficiently dephosphorization process of common dephosphorization process.For phosphorus elution processes or the necessary Special Equipment of Bardenpho technology, this technology can not used fully, or is restricted to the sedimentary equipment of phosphorus in turbidity and the filtered water that makes.
For addressing this problem, this invention is pointed out, the mixed solution absorption phase at first under anaerobic of waste water and activatory mud is handled, and in the middle of flowing into, under aerobic condition, handling before the clarification stage, microbial bacteria not only under anaerobic but also under aerobic condition had been worked like this.According to this invention, the microorganism of absorption phase best with main be probiotics family (pro-tocytes) (West Germany offenlegunsschrift 3317371), be alternative anaerobism or aerobic microbiological therefore.Anaerobic condition is a kind of like this method, although the circulation of waste water and activatory mud mixed liquid is promptly arranged, does not have dissolved oxygen or not with NO 3Or NO 2Form bonded oxygen.According to this invention, aerobic condition is meant so a kind of program technic, and wherein the content of oxygen obviously greater than zero, be at least 0.2 mg/litre, or average oxygen content is 1.0 mg/litre.Clearly, waste water flows into absorption phase can contain nitrogen compound, but according to this invention, very fast this process of having controlled after waste water flows into anaerobic condition.
This invention is true from this, and promptly phosphorus does not decompose in clarification equipment, and can only drain with mud.Therefore to obtain high phosphorus and remove, can only be: make sludge quantity many as far as possible on the one hand; Phosphorus content in the mud is big as much as possible on the other hand.The surplus sludge volume that produces in biological purification of effluent technology depends on the carbide content in the influent waste water.Therefore this invention is based on such fact, in the A in A stage level technology, when removing BOD 5The time produced a large amount of excess sludges.In fact the scope of surplus sludge volume is at 2-3 kilogram DS/ kilogram BOD 5(decomposition).In a lot of equipment, excess sludge production is approximately 2.6-2.7 kilogram DS/ kilogram BOD 5Clearly, low load stage afterwards, this will lack the rate ratio of excess sludge.The fact that this invention is so substantially, promptly in the A level stage, except known effect, biological process can also be removed phosphorus in greater amount ground.According to the condition of this invention, the phosphorus that stores in cell the microorganism in the A level stage phosphorus more required than metabolism is many.The needed phosphorus amount of cell proliferation approximately is per 100 gram BOD 5At least want a gram phosphorus, be equal in activatory mud dry-matter and contain 1% phosphorus approximately.As previously mentioned, the tp removal rate common with A level technology contrasts, and contains the phosphorus of 1-4% in the excess sludge dry-matter of being discharged.Surprisingly, microorganism carries out under this serious situation of alternative anaerobic and aerobic condition at A level elementary reaction.Under aerobic situation, they can store the more polyphosphate of volume.The biological explanation of this situation, estimation are in anaerobic zone, and microorganism has become the polyphosphate of these storages into Triphosaden (ATP) to keep its metabolic method.According to this invention, waste water after the processing of after a while aerobic condition, the clarification stage in the middle of a part of mud is discharged to.So the phosphoric residue that microorganism is carried secretly is removed from device too.It is possible removing phosphorus like this, and the content of phosphorus can reach 8% in the excess sludge dry-matter of being discharged.
According to the program of this invention, promptly begin at anaerobic condition with later under aerobic condition, its groundwork can be realized with various approach.A kind of significantly simple form of implementing this invention is, according to the water inlet flow direction, carries out anaerobic treatment in first part in absorption phase, and second section carries out aerobic operation.According to the flow direction of water, these two portions interconnect, and this two-part boundary can change, and can be suitable for different operational conditionss.Absorption phase also can alternately be carried out the anaerobic and aerobic operation in continuous time, so just can flow into intermediate clarifier in aerobic operation back, carries out the anaerobism operation in the time of if necessary again.As a principle, rest on the anaerobic treatment time of waste water in the high loading treating pond, account for 1/3rd to 2/3rds of its residence time, all the other times are carried out aerobic treatment.Waste water is about 30 minutes in the mean time of absorption phase.The order of absorption phase mud should if the mud order is very short, just can obtain a large amount of excess sludges between 2 to 12 hours.
According to an example of the present invention, formed excess sludge during operation, it contains the phosphorus of a large amount of compound forms, thereby has removed phosphorus from waste water.If excess sludge is concentrated, and the turbidity from concentration basin can not discharge immediately, then this invention suggestion is carried out phosphatic precipitation process to being transported to reaction tank from the water of concentration basin and filtering water, and the water of discharging in the reaction tank is transported to the water-in in A level stage again.
Summing up the advantage of this technology can see, the method according to this invention adopts the treatment facility that meets A level technology can remove phosphorus in a large number.This depends in the order of A level stage mud and will lack that it is high that excess sludge production is wanted.The generation of this situation is because according to the present invention, has set up pressure environment in the A level stage, makes microorganism carry out work, and causes the mud of high content of phosphorus.If by the above discharging.When moving, find that in the A level stage acinetobacter amount of bacteria is 5% or more, show the ability that has increased biological phosphate-eliminating according to this invention.The most outstanding advantage is not have the nitrification and denitrification problem.Removed a lot of nitrogen in low load stage, needed long mud order in this stage.According to this invention, dephosphorization has been given the high loading stage biological bacterium colony different with low load stage with the task of denitrogenating.In the best biological process dephosphorization of high loading level section with impel preferentially that to form the selected bacterial species with making a variation must be to be in activation stage, and activation stage also can be a trickling filter.
Be explained in more detail this invention with a schema below, it just represents the example of an enforcement.This figure shows the equipment flowsheet of implementing above-mentioned technology.
From this schema, at first can find out waste water flow direction from inlet water to outlet water according to arrow 1 direction.This illustrates the treatment facility that purifies sanitary wastewater.Can see that absorption phase 2 is that the activation stage with high loading turns round, and middle clarification stage 3 and low load stage 4.The final clarification stage 5 is connected on after the low load stage 4.Grid 6 and sand filtration 7 are before absorption phase 2.The middle clarification stage 3 is equipped with mud relief outlet 8, and finally clarifying the stage 5 has mud relief outlet 9.Microorganism species separates between absorption phase 2 and low load stage 4, does not promptly have excess sludge or returned sluge to turn back to absorption phase 2 from low load stage 4.It is active that the anaerobion of selecting in the absorption phase 2 is.Low load stage 4 can carry out nitrated and continue after denitrification.In an example of operation, low load stage 4 is activation ponds.The mud in middle clarification stage 3 can turn back in the absorption phase 2 as returned sluge by pipeline 10.The mud that comes from the final clarification stage 5 turns back in the low load stage 4 by pipeline 11 as returned sluge.Excess sludge is drained by pipeline 12.Waste water at first carries out the processing under the anaerobic condition in absorption phase 2, then, in the middle of flowing into before the clarification stage 3, owing to provide, advanced person's oxygen of acting charitably is handled.In embodiment as shown in the figure, its arrangement is design like this, and according to the flow direction of water inlet, the 2a of first part in the absorption phase 2 carries out anaerobic treatment earlier, and second section 2b carries out aerobic treatment.It is transformable that this two-part boundary is divided, and represents with double-headed arrow in the drawings.Its boundary that requires according to operation can move.
In the example of running, can drain into concentration basin 14 through piping 12 and 15 together or respectively from the excess sludge of absorption phase 2 and low load stage 4.Turbid water is transported in the reaction tank 17 by pipeline 16 in the concentration basin, adds precipitation agent and handle in the pond, makes the phosphorus precipitation.Water in the reaction tank 17 is transported to water intake by pipeline 18.Consequently active sludge is drained through piping 19 on the one hand, and the chemical sludge that contains high-content phosphorus is on the other hand drained through piping 20.Digested sludge in the septic tank 21 should be dewatered, and this will carry out in dehydrating station 22.Mud after the dehydration is discharged 23, it or can be used for agricultural, perhaps carry out landfill.The filtration that produces during dehydration is delivered in the reaction tank 17 through piping 24, and final concentration basin 26 is between septic tank 21 and dehydrating station 22.The liquid that this pond produces is transported to reaction tank by pipeline 27.The drainage water of reaction tank also can turn back to water-in through piping 25.

Claims (7)

1, purify liquid waste, the method for sanitary wastewater particularly, wherein, the waste water that purify at first is transported to the high loading activation stage as absorption phase, by an intermediate clarifier, mud is separated then, be transported to low load stage at last, it and principal defecation stage link, with separated sludge
In this technology, selected anaerobion carries out work in absorption phase, to keep the mud of low mud order in the starting stage, method is in the middle clarification stage mud to be separated, can carry out nitrated in low load stage, continue after adopt the method for recycling of waste water and mud mixed liquid to carry out denitrification, in this technology, the excess sludge of middle clarification stage discharge can be used as returned sluge and sends into absorption phase again, and the mud of finally clarifying the stage can be sent into low load stage again as returned sluge, excessive mud is discharged and concentrated, it is characterized in that, the mixture of waste water and mud absorption phase (fs) is at first under anaerobic handled, and handles under aerobic condition before the clarification stage in the middle of entering, and wants to stand two kinds of conditions of anaerobic and aerobic in the microorganism in high loading stage.
2, method according to claim 1 is characterized in that, at the flow direction of absorption phase according to waste water, at first carries out anaerobic treatment, and subordinate phase is carried out aerobic treatment.
3, method according to claim 1 is characterized in that, alternately carry out anaerobic and aerobic continuously in absorption phase and handle, but the clarification stage in the middle of must being transported to after aerobic treatment is carried out anaerobic treatment in case of necessity again.
According to any one described method among the claim 1-3, it is characterized in that 4, the time that waste water carries out anaerobic treatment accounts for 1/3rd to 2/3rds of absorption phase, all the other times are the processing under the aerobic condition.
5, according to any one described method among the claim 1-4, it is characterized in that, the excess sludge of absorption phase and the excess sludge of low load stage, can concentrate together or respectively, the turbidity that produces when concentrating is transported in the reaction tank, adding phosphate precipitating agent in this pond handles, preferably calcium oxide and calcium hydroxide, or iron and aluminium salt, or other suitable alkaline earth salt, the filtered water of discharging from the turbidity and the sludge dewatering of the liquid of reaction tank, final concentration basin is transported to the water intake before the absorption phase together again.
According to any one described method among the claim 1-5, it is characterized in that 6, spissated turbidity of mud and filtered water will be carried out the calcium phosphate precipitation processing, sedimentary in case of necessity mud is transported in the water inlet in high loading stage.
According to any one the described method in claim 1-4 and 6, it is characterized in that 7, after the middle clarification stage, waste water is not further processed in the underload device.
CN86101140A 1985-03-02 1986-02-25 Purifying process for waste waater Expired CN1015887B (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19853507388 DE3507388A1 (en) 1985-03-02 1985-03-02 Process for purifying waste water
DEP3507388.8 1985-03-02

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CN86101140A true CN86101140A (en) 1987-09-09
CN1015887B CN1015887B (en) 1992-03-18

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CN86101140A Expired CN1015887B (en) 1985-03-02 1986-02-25 Purifying process for waste waater

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JP (1) JPS61200893A (en)
CN (1) CN1015887B (en)
DE (1) DE3507388A1 (en)
ES (1) ES8701693A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101456645B (en) * 2004-02-02 2013-07-10 栗田工业株式会社 Process for biological treatment of organic waste water and apparatus therefor

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3619229C2 (en) * 1986-06-07 1994-03-24 Ivan Prof Dr Ing Sekoulov Multi-stage process e.g. extensive wastewater treatment d. biological oxidation v. organic hydrocarbon compounds (BOD degradation), biological nitrogen elimination without external H donors and. a subsequent filtration u. Plant z. Implementation d. Procedure
DE3833039A1 (en) * 1988-09-29 1990-04-05 Werner Maier Process and apparatus for the purification of phosphate- and nitrogen-containing waste water
JPH02293094A (en) * 1989-05-02 1990-12-04 Inax Corp Method for removing phosphorus in sewage
DE4100685A1 (en) * 1991-01-11 1992-07-16 Sued Chemie Ag METHOD FOR CLEANING WATER CONTAINING PHOSPHATES AND NITROGEN COMPOUNDS
IT1249625B (en) * 1991-06-10 1995-03-09 Enea Process for the purification treatment of municipal wastewater and plant using the said process
DE4204955C2 (en) * 1992-02-19 1996-10-17 Tecon Gmbh Process for removing nitrogen and carbon compounds from waste water
ES2093556B1 (en) * 1995-03-06 1997-07-01 Biotecnologia S A PROCEDURE FOR THE INTEGRAL DEPURATION OF ORGANIC WASTEWATER, BY BIOLOGICAL PROCESSES.

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2908134C2 (en) * 1979-03-02 1983-10-20 Böhnke, Botho, Prof. Dr.-Ing., 5100 Aachen Plant for the purification of wastewater

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101456645B (en) * 2004-02-02 2013-07-10 栗田工业株式会社 Process for biological treatment of organic waste water and apparatus therefor

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Publication number Publication date
ES8701693A1 (en) 1986-12-16
ES551763A0 (en) 1986-12-16
CN1015887B (en) 1992-03-18
DE3507388A1 (en) 1986-09-04
JPS61200893A (en) 1986-09-05

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