CN1686864A - Treatment method for home wastewater - Google Patents
Treatment method for home wastewater Download PDFInfo
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- CN1686864A CN1686864A CNA2005100708603A CN200510070860A CN1686864A CN 1686864 A CN1686864 A CN 1686864A CN A2005100708603 A CNA2005100708603 A CN A2005100708603A CN 200510070860 A CN200510070860 A CN 200510070860A CN 1686864 A CN1686864 A CN 1686864A
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- sludge
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- water
- source matrix
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- 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
- Y02W10/30—Wastewater or sewage treatment systems using renewable energies
- Y02W10/37—Wastewater or sewage treatment systems using renewable energies using solar energy
Abstract
The present invention relates to a domestic sewage treatment method. Said method includes the following steps: firstly, respectively cultivating active sludge in the anaerobic pool and aerobic pool of sewage treatment system; feeding the domestic sewage into anaerobic pool to implement anaerobic phosphorus-releasing reaction, then feeding the domestic sewage into aerobic pool to implement aerobic phosphorus-absorbing reaction, then feeding the domestic sewage into precipitation pool to make precipitation to separate sludge from water, making the precipitated sludge back-return into anaerobic pool and making the residual sludge discharge from system, feeding the precipitated water into aerobic biological filtering pool to implement nitration reaction to make the discharged water meet discharge standard.
Description
Technical field
The present invention relates to a kind of treatment process of sanitary sewage, belong to environmental protection technical field.
Background technology
In the prior art, sanitary sewage is carried out the method that denitrogenation dephosphorizing is handled, adopting maximum is that anaerobic-anoxic-aerobic method is (hereinafter to be referred as A
2/ O method).Its main flow as shown in Figure 1, water inlet 1K at first enters anaerobic pond 1A, enters anoxic pond 1B then, flows into Aerobic Pond (nitration reaction is arranged) 1C again, realizes that through settling tank 1D post precipitation mud separates water outlet 1J with sewage.If phosphorously in the water outlet will reach country-level standard, need to increase filtering basin 1E.
Denitrification functions: to anoxic pond 1B mixed-liquor return 1F being arranged at Aerobic Pond 1C, is 1～3 times of water into approximately.Ammonia nitrogen is oxidized to nitrate nitrogen in Aerobic Pond 1C, realizes nitration reaction.Nitrate nitrogen is got back to anoxic pond 1B by mixed-liquor return 1F, in anoxic with exist under the condition of carbon source matrix, anti-nitration reaction takes place, and is reduced into nitrogen.
Phosphorus removal functional: at settling tank 1D to mud backflow 1G is arranged between anaerobic pond 1A.Active sludge is post precipitation in settling tank 1D, and 1G returns anaerobic pond 1A by the mud backflow, in anaerobism and having under the condition of carbon source matrix, discharges phosphorus.When flowing through Aerobic Pond 1C, under aerobic condition, realize the excessive absorption of phosphorus.Passing through excess sludge discharge 1H, when excess sludge was discharged system, the phosphorus that contains in the excess sludge also just was exhausted from system.
With A
2/ O is the activated sludge process of representative, the three big shortcomings that exist on denitrogenation dephosphorizing:
1. the contradiction of nitrate nitrogen existence is in the dispose procedure that carries out phosphorus, and the poor effect that the existence of nitrate can cause phosphorus to discharge has influenced phosphor-removing effect.A
2Nitrate nitrogen can't be removed fully in the/O method, and theoretical clearance is 83%.And being difficult to exist nitrate nitrogen among the mud 1G that refluxes with avoiding, these nitrate nitrogens enter anaerobic pond 1A, will influence the release of phosphorus.
2. generation cycle and sludge age be in the treatment system of activated sludge process, because mud is mobile, so be identical mud age of different treatment section mud.In the nitration reaction of denitrogenation the generation cycle of nitrifier very long, so need sludge age long.And dephosphorization requires just to cause sludge age short, and the many more phosphor-removing effects of discharging mud are good more.But mud age is the same in the Sludge System.So cause the contradiction of denitrogenation and dephosphorization.
3. the competition to carbon source matrix needs carbon source matrix in the denitrification process, and the dispose procedure of phosphorus needs carbon source matrix equally in the dephosphorization process, has just caused the competition to carbon source matrix.
Therefore, A in engineering practice
2There is following problem in/O method:
1, because denitrogenation and dephosphorization all need carbon source matrix, so A
2/ O method has certain requirement to influent quality, promptly requires to contain more effective organism in the water inlet.If effectively the organism deficiency will influence treatment effect, this problem is more outstanding in China south.
2, because nitration reaction speed is slow,,, make the structures civil engineering cost higher usually at 3.5-6 hour so cause the hydraulic detention time (hereinafter to be referred as HRT) of Aerobic Pond 1C very long.
Summary of the invention
The objective of the invention is to propose a kind of sewage denitrification and dephosphorization treatment process, to solve the contradiction that exists in the existing treatment process, reach the primary standard in " national sewage comprehensive emission standard " better, and dwindle the civil engineering scale, improve the denitrogenation dephosphorizing effect, reduce the water quality requirement of water inlet, reduce and handle energy consumption, enhanced system stability effectively.
The treatment process of the sanitary sewage that the present invention proposes may further comprise the steps:
(1) in the anaerobic pond of Sewage treatment systems and Aerobic Pond, cultivates active sludge respectively;
(2) sanitary sewage enters anaerobic pond, stops 0.5～1 hour, finishes the anaerobic phosphorus release reaction, enters Aerobic Pond again, stops 1.0～3 hours, finishes aerobic absorption phosphorus reaction, enters through the settling tank precipitation again, makes mud-water separation;
(3) account for into that the precipitating sludge of water volume 30～50% is back to anaerobic pond by mud, outside the excess sludge discharge system that system produces;
(4) water outlet of post precipitation enters aerobic biofilter, and aeration stopped 0.5～1.5 hour, and the gas-water ratio of aeration is: air capacity: flooding quantity=1～4: 1, finish nitration reaction, and promptly reach emission standard;
(5) part of above-mentioned discharge water is used for aerobic biofilter is carried out back flushing, and backwashing strength is 5～20L/m
2S.
Aforesaid method can also comprise: add carbon source matrix in the water outlet of step (5), enter the anoxic biological filter again, stopped 0.5～1 hour, finish denitrification reaction; Wherein the add-on of carbon source matrix is: C=2.86[NO
3-N]+1.71[NO
2-N]+DO, wherein, C is the amount that adds carbon source matrix in every premium on currency, the unit milligram; [NO
3-N] be the nitrate amount that adds in every premium on currency, the unit milligram; [NO
2-N] be the nitrite amount that adds in every premium on currency, the unit milligram; DO is the dissolved oxygen content that adds in every premium on currency, the unit milligram; With discharge water back flushing is carried out in the anoxic biological filter, backwashing strength is 5～20L/m
2S.
The preparation method of the carbon source matrix in the aforesaid method may further comprise the steps:
(1) with excess sludge discharge to sludge thickener, obtain supernatant liquor, promptly contain carbon source matrix;
(2) above-mentioned thickened sludge is dewatered, obtain surplus filtrate, promptly contain carbon source matrix.
The sewage denitrification and dephosphorization treatment process that the present invention proposes has the following advantages in practice:
1, less demanding to influent quality, be particularly useful for China south.South city domestic sewage organic content is not high, but phosphorus content is higher.The sewage denitrification and dephosphorization treatment process that adopts the present invention to propose, it is little that the denitrogenation dephosphorizing effect is influenced by influent quality, will improve treatment effect.
2, reduction residence time HRT, A
2The HRT of/O method was at 7.5～10.5 hours, and the inventive method HRT was at 4 ~ 5.5 hours, and civil engineering pond appearance dwindles 45%.And additive method, HRT is many more than 18 hours.So the inventive method has shortened HRT.
3, because BAF (hereinafter to be referred as BAF) has filtering function, need not settling tank, stable effluent quality, (hereinafter to be referred as SS) is low for the water outlet suspended solid, has also just held back the phosphorus that contains among the SS, and phosphor-removing effect is better.
4, BAF dissolved oxygen efficiency height, the nitrification effect ideal, temperature influence is little.Especially aeration rate is little, and aeration energy consumption reduces.The inventive method does not have A
2Mixed-liquor return in the/O method has also just reduced the backflow energy consumption.So under the situation that reaches the same treatment standard, processing cost is lower than A
2/ O method.
Description of drawings
Fig. 1 is the domestic sewage denitrifying-dephosphorizing treatment process of prior art.Among the figure, 1A is an anaerobic pond; 1B is an anoxic pond; 1C is an Aerobic Pond; 1D is a settling tank; 1E is filtering basin; 1F is a mixed-liquor return; 1G is that mud refluxes; 1H is an excess sludge; 1K is a water into; 1J is water outlet.
Fig. 2 is the processing flow chart of the inventive method.Among the figure, 2A is an anaerobic pond; 2B is an Aerobic Pond; 2C is a settling tank; 2D is an aerobic biofilter; 2E is the anoxic biological filter; 2F is clean water basin; 2G is a water into; 2H is water outlet; 2I is that mud refluxes; 2J is an excess sludge; 2K is a carbon source matrix; 2L is the recoil water inlet; 2M is the recoil water outlet.
Embodiment
The sewage denitrification and dephosphorization treatment process that the present invention proposes, its flow process are at first cultivated active sludge respectively as shown in Figure 2 in the anaerobic pond 2A of Sewage treatment systems and Aerobic Pond 2B; Sanitary sewage enters anaerobic pond 2A, stops 0.5～1 hour, finishes the anaerobic phosphorus release reaction, enters Aerobic Pond 2B again, stops 1.0～3 hours, finishes aerobic absorption phosphorus reaction.Enter precipitation again, make mud-water separation through settling tank 2C; Account for into that the precipitating sludge 2I of water volume 30～50% is back to anaerobic pond by mud, outside the excess sludge 2J discharge system; The water outlet of post precipitation enters aerobic aeration biological filter 2D, and aeration stopped 0.5～1.5 hour, and the gas-water ratio of aeration is: air capacity: flooding quantity=1～4: 1, finish nitration reaction, and promptly reach emission standard; The part of above-mentioned discharge water is used for aerobic biofilter is carried out back flushing, and backwashing strength is 5～20L/m
2S.
The inventive method is the method that activated sludge process is combined with biomembrance process, just will not have the method that nitration reaction dephosphorization method (hereinafter to be referred as the A/O method) same BAF (hereinafter to be referred as BAF) denitrogenation combines.In the A/O method, A (anaerobic) is an anaerobism, and O (Oxic) is aerobic, is the simplest biological phosphate-eliminating technology of unit combination, is a kind of maturation process, and first productivity device was constructed and put into operation in the U.S. in 1979.The present invention utilizes BAF (hereinafter to be referred as BAF), nitrification and denitrification is carried out in the water outlet after the dephosphorization of A/O method handle, and reaches the purpose of denitrogenating.Filler is arranged in the BAF, and the microorganism that growing on the filler forms microbial film.Because microbial film is attached on the carrier, sludge age is greatly improved, and satisfies nitration reaction to mud long requirement in age.Simultaneously BAF has filtering function, can trap water in suspended solid (hereinafter to be referred as SS).BAF has numerous having a few, as takes up an area of characteristics such as little, that processing efficiency is high, dissolved oxygen efficiency is high, treatment effect is stable, water outlet SS is low, is fit to very much the nitration reaction of sewage.Under the aerobic condition, the ammonia nitrogen in the water outlet of process A/O method is oxidized to nitrate nitrogen through the nitrification of microorganism among the BAF, can reach national corresponding emission standard.After this, in anoxic and existing under the condition of carbon source matrix, nitrate nitrogen is reduced into nitrogen through the anti-nitration reaction of microorganism among the BAF.
Dephosphorization process in the inventive method is: the water inlet 2G of sanitary sewage enters anaerobic pond 2A, enters Aerobic Pond 2B again, through settling tank 2C mud-water separation; Part mud is got back to anaerobic pond 2A by mud backflow 2I, and excess sludge 2J outside the discharge system, reaches the purpose of dephosphorization.Water outlet enters aerobic biofilter 2D, has filtered the SS in the final outflow water, removes the phosphorus that contains among the SS.
Denitrification process: the water outlet through the dephosphorization of A/O method, be introduced into aerobic biofilter 2D, nitration reaction takes place, ammonia nitrogen is converted into nitrate nitrogen.Enter anoxic biological filter 2E again, nitrate nitrogen is reduced to the purpose that nitrogen reaches denitrogenation.Water outlet stores through clean water basin 2F, final outflow water 2H.Because the biological filter is held back pollutent and is increased after for some time, need recoil.So establish recoil pump at clean water basin, recoil water inlet 2L enters biological filter 2D and 2E, and recoil water outlet 2M enters front end operation 2A, 2B or 2C.
The surplus filtrate that carbon source matrix produces in the time of can adopting excess sludge 2J dehydration; Or spissated supernatant liquor; Or direct extraneous carbon source such as methyl alcohol etc.
2D and 2E can be divided into several junior units.On 2D and 2E rising pipe, increase in-line pump, when a unit recoils, utilize the normal water outlet of other junior units, as recoil water.At this moment, 2F can save.
In order to improve phosphor-removing effect, can set up auxiliary constructions such as deep-well preliminary sedimentation tank or concentrated fermentation vat, the fats organism with in the water inlet by effects such as fermentations, changes effective carbon source matrix into, to improve phosphor-removing effect.
The sewage denitrification and dephosphorization treatment process that the present invention proposes has solved three big contradictions of existing active sludge denitrification and dephosphorization method:
1, the contradiction of nitrate nitrogen existence is because the no nitrated dephosphorization A/O method of front end guarantees that in operation mud is quite short age, and nitrobacteria can't exist, so can't produce nitrate nitrogen in the process of dephosphorization, promptly can not impact anaerobic phosphorus release.A
2Nitrate nitrogen can't be removed fully in the/O method, enters anaerobic pond 1A unavoidably, will influence the release of phosphorus.
2, generation cycle and sludge age front-end A/O method unit are different with the unitary mud of BAF biomembrance process thereafter age.Front-end A/O activated sludge process owned by France can guarantee in operation that sludge age is short, satisfies the dephosphorization requirement short to sludge age; Rear end BAF microbial film biomembrance process owned by France, sludge age is long, satisfies the requirement of denitrogenation nitration reaction.Therefore solved the contradiction of sludge age.
3, the carbon source matrix in the competition water inlet of carbon source matrix is at first satisfied the needs of anaerobic phosphorus release, and required carbon source matrix is the surplus filtrate that produces in the time of can adopting excess sludge 2J dehydration when denitrification; Or spissated supernatant liquor; Or direct extraneous carbon source such as methyl alcohol etc.This has just solved the contradiction that denitrogenation dephosphorizing needs carbon source matrix simultaneously, so the inventive method is less demanding to influent quality.And A
2/ O method carbon source matrix all needs to provide from water inlet, and influent quality is had relatively high expectations.
Embodiment:
The hydraulic detention time of 2A is 0.5-1.0 hour, and the hydraulic detention time of 2B is 1.0-2.5 hour, and 2C is common settling tank, and the 2D filtering velocity is 3-6m/h, and the 2E filtering velocity is 3-6m/h.Front-end A/O method, sludge age are 2-6 days, and total sludge concentration is 2000-4000mg/L.
Claims (3)
1, a kind of treatment process of sanitary sewage is characterized in that this method may further comprise the steps:
(1) in the anaerobic pond of Sewage treatment systems and Aerobic Pond, cultivates active sludge respectively;
(2) sanitary sewage enters anaerobic pond, stops 0.5～1 hour, finishes the anaerobic phosphorus release reaction, enters Aerobic Pond again, stops 1.0～3 hours, finishes aerobic absorption phosphorus reaction, enters through the settling tank precipitation again, makes mud-water separation;
(3) account for into that the precipitating sludge of water volume 30～50% is back to anaerobic pond by mud, outside the excess sludge discharge system;
(4) water outlet of post precipitation enters aerobic biofilter, and aeration stopped 0.5～1.5 hour, and the gas-water ratio of aeration is: air capacity: flooding quantity=1～4: 1, finish nitration reaction, and promptly reach emission standard;
(5) with discharge water aerobic biofilter is carried out back flushing, backwashing strength is 5～20L/m
2S.
2, the method for claim 1 is characterized in that also comprising: add carbon source matrix in the water outlet of above-mentioned steps (5), enter the anoxic biological filter again, stopped 0.5～1 hour, finish denitrification reaction; Wherein the add-on of carbon source matrix is: C=2.86[NO
3-N]+1.71[NO
2-N]+DO, wherein, C is the amount that adds carbon source matrix in every premium on currency, the unit milligram; [NO
3-N] be the nitrate amount that adds in every premium on currency, the unit milligram; [NO
2-N] be the nitrite amount that adds in every premium on currency, the unit milligram; DO is the dissolved oxygen content that adds in every premium on currency, the unit milligram; With discharge water back flushing is carried out in the anoxic biological filter, backwashing strength is 5～20L/m
2S.
3, method as claimed in claim 2 is characterized in that the preparation method of wherein said carbon source matrix may further comprise the steps:
(1) with excess sludge discharge to sludge thickener, obtain supernatant liquor, promptly contain carbon source matrix;
(2) above-mentioned thickened sludge is dewatered, obtain surplus filtrate, promptly contain carbon source matrix.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2005100708603A CN1686864A (en) | 2005-05-20 | 2005-05-20 | Treatment method for home wastewater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2005100708603A CN1686864A (en) | 2005-05-20 | 2005-05-20 | Treatment method for home wastewater |
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| Publication Number | Publication Date |
|---|---|
| CN1686864A true CN1686864A (en) | 2005-10-26 |
Family
ID=35304906
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2005100708603A Pending CN1686864A (en) | 2005-05-20 | 2005-05-20 | Treatment method for home wastewater |
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| Country | Link |
|---|---|
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102730898A (en) * | 2011-04-13 | 2012-10-17 | 吴世凯 | Community domestic sewage treatment technology |
| CN104671434A (en) * | 2015-02-10 | 2015-06-03 | 同济大学 | Method for simultaneously reducing anaerobic phosphorus release of phosphorous removal microorganisms and increasing phosphorus absorption/phosphorus release rate and biological phosphorus removal effect |
| CN107827324A (en) * | 2017-12-08 | 2018-03-23 | 郑仕雪 | A kind of town sewage total system |
-
2005
- 2005-05-20 CN CNA2005100708603A patent/CN1686864A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102730898A (en) * | 2011-04-13 | 2012-10-17 | 吴世凯 | Community domestic sewage treatment technology |
| CN104671434A (en) * | 2015-02-10 | 2015-06-03 | 同济大学 | Method for simultaneously reducing anaerobic phosphorus release of phosphorous removal microorganisms and increasing phosphorus absorption/phosphorus release rate and biological phosphorus removal effect |
| CN104671434B (en) * | 2015-02-10 | 2016-06-15 | 同济大学 | The method that phosphorus improves suction phosphorus/release phosphorus when biological phosphor-removing effect simultaneously is released based on reducing dephosphorization microbiological anaerobic |
| CN107827324A (en) * | 2017-12-08 | 2018-03-23 | 郑仕雪 | A kind of town sewage total system |
| CN107827324B (en) * | 2017-12-08 | 2023-05-19 | 郑仕雪 | Urban sewage comprehensive treatment system |
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