CN101935136B - Zero energy consumption low sludge yield municipal sewage dephosphorization and denitrification treatment method - Google Patents
Zero energy consumption low sludge yield municipal sewage dephosphorization and denitrification treatment method Download PDFInfo
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- CN101935136B CN101935136B CN2010102412652A CN201010241265A CN101935136B CN 101935136 B CN101935136 B CN 101935136B CN 2010102412652 A CN2010102412652 A CN 2010102412652A CN 201010241265 A CN201010241265 A CN 201010241265A CN 101935136 B CN101935136 B CN 101935136B
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- 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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- 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
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Abstract
The invention provides a municipal sewage dephosphorization and denitrification treatment method, relates to a sewage treatment method and discloses a zero energy consumption low sludge yield municipal sewage dephosphorization and denitrification treatment method. In the Zero energy consumption low sludge yield municipal sewage dephosphorization and denitrification treatment method, pretreated municipal sewage and returned sludge and returned digested sludge which are returned by a secondary sedimentation tank enter an anaerobic reactor together for carrying out biochemical reaction; the discharged water of the anaerobic reactor and mixed liquid returned by an aerobic reactor enter an anoxic reactor for carrying out denitrification and other biochemical reactions; the discharged water of the anoxic reactor enters the aerobic reactor for carrying out organic matter degradation and dinitrification; the mixed liquid of discharged water of the aerobic reactor enters the secondary sedimentation tank for carrying out sludge-water separation; and remained activated sludge is concentrated and discharged to an anaerobic sludge digestion unit for digestion treatment; the anaerobic sludge digestion unit digests sludge in anaerobic condition; a part of digested sludge returns to the anaerobic reactor or the anoxic reactor or the aerobic reactor; and the other part of digested sludge is dewatered and then is subjected to sludge disposal.
Description
Technical field
The invention belongs to a kind of sewage disposal technology, specifically relate to a kind of dephosphorization denitrogenation sewage water treatment method of the low sludge yield of zero energy consumption of municipal effluent.
Background technology
Along with the high speed development of Chinese national economy and the continuous quickening of urbanization process, the town domestic sewage amount also significantly increases, and surpasses first discharged volume of industrial waste water in 1999, accounts for 52.9% of national total amount of sewage discharge.In recent years, the town domestic sewage amount has become the primary pollution source of China's water surrounding with average annual 5% speed increase.Municipal sewage treatment is one of high energy consumption industry.High energy consumption causes cost of sewage disposal to raise on the one hand, has also aggravated to a certain extent on the other hand the current energy dilemma of China.Therefore, the research of carrying out municipal sewage plant's energy conservation has become the task of top priority.The energy consumption expenditure of municipal sewage plant generally includes the aspects such as electric energy, fuel and medicament, and wherein power consumption can account for 80% of total energy consumption.The oxygen supply and promoting that the consumption of electric energy is mainly used in lifting, the biological treatment of sewage sludge mixes, the aspects such as processing disposal, auxiliary building electricity consumption and plant area's illumination of mud, and wherein about 40%～50% power consumption is for the aeration tank oxygen supply.Therefore, saving on the one hand power consumption is an energy-saving and cost-reducing emphasis of sewage treatment process, reduces the oxygen supply power consumption and then be the link of tool energy-saving potential.On the other hand, mud is as a kind of Biological resources, and the recycling that improves mud then is another important technical development approach.Sludge from wastewater treatment plant mainly is comprised of the primary sludge (water ratio is about 96%) of settling pit and primary sedimentation pond generation and the excess sludge (water ratio is 99.2%～99.6%) that the aerobe processing unit produces.The municipal sludge water ratio is high, and bulky, organic content is up to 50%～70%, and character is unstable.Because concentrated/anaerobic digestion/dewatering process can be realized sludge reduction and stabilization simultaneously, and produces with callable combustion gas (methane), final mud can be used as agricultural fertile reuse, so be used widely.
United States Patent (USP) (US patent application no.20080223783) has been invented a kind of Sewage treatment systems that is comprised of aerobic membrane bioreactor and anaerobic sludge digestion.Excess sludge enters sludge digestion tank and carries out anaerobic digestion after being discharged by aerobic membrane bioreactor.Simultaneously, the anaerobic sludge pump around circuit is to aerobic membrane bioreactor.This treatment process has the characteristics of efficient and low sludge yield.
Summary of the invention
The object of the present invention is to provide the Phosphorus Removal from Municipal Wastewater denitrifying method of the low sludge yield of a kind of zero energy consumption.It is characterized in that, comprehensive utilization by technology such as anaerobic sludge digestion and biological removal of phosphorus in wastewater denitrogenations, improve the quantity discharged of methane gas output and reduction digested sludge, thereby the energy consumption (electric energy and heat energy) of sewage and sludge treatment can be provided by the recycling of methane gas energy.Specifically comprise the steps:
(1) next returned sluge together enters anaerobic reactor through pretreated sewage with by secondary sedimentation basins; Simultaneously, the digested sludge that is refluxed by anaerobic sludge digestion unit partly or entirely enters anaerobic reactor.In anaerobic reactor, sewage and mud are through aeration or stir formation mixed solution a.
(2) mixed solution a flows into anoxic reacter by anaerobic reactor, and the digested sludge that is refluxed by anaerobic sludge digestion unit simultaneously partly or entirely enters anoxic reacter; Mixed solution b is back to anoxic reacter by aerobic reactor.In anoxic reacter, sewage and mud are through aeration or stir formation mixed solution c.
(3) mixed solution c flows into aerobic reactor by anoxic reacter, and the digested sludge that is refluxed by anaerobic sludge digestion unit simultaneously partly or entirely enters aerobic reactor.The mixed solution that aerobic reactor flows out, a part (mixed solution b) is back to anoxic reacter, and a part (mixed solution d) enters secondary sedimentation basins in addition.
(4) after mixed solution d enters secondary sedimentation basins, go three grades of sewage disposals or discharge system as water outlet through settled sewage; Mud is discharged from the secondary sedimentation basins bottom, and wherein major part enters anaerobic reactor as returned sluge, and excess sludge discharge is to the mud upgrading unit.
(5) at the mud upgrading unit, thickened sludge is disposed to anaerobic sludge digestion unit and carries out digestion process.Moisture in the removed mud (such as supernatant liquor) is back to the sewage pre-treatment.
(6) anaerobic sludge digestion under anaerobic digested sludge of unit is produced as take methane as main biogas and digested sludge.In the discharge mud of sludge digestion unit, a part of digested sludge all is back to anaerobic reactor or anoxic reacter or aerobic reactor, perhaps is back to respectively in proportion anaerobic reactor or anoxic reacter or aerobic reactor; Another part digested sludge is carried out sludge dewatering and disposal by national requirements.
Described step 1 is that anaerobic reactor is accepted the sewage next by the sewage pre-treatment, and the Dissolved Oxygen concentration Control in the anaerobic reactor is being lower than 0.2mg/L, is beneficial to microorganism under anaerobic to discharge phosphorus; Mechanical stirrer or impeller under water can be set, to strengthen mixing effect.The sewage pre-treatment can comprise coarse rack, fine fack, settling pit and preliminary sedimentation tank etc., in order to remove the larger suspended substance of volume, floating matter and proportion larger inorganic particle and grease, to alleviate the burden of subsequent technique.
Described step 2 is to utilize anoxic reacter to carry out denitrification reaction.Mixed solution b provides the required nitrate nitrogen of anti-nitration reaction and nitrous acid nitrogen.Dissolved Oxygen concentration Control in the anoxic reacter is being lower than 0.5mg/L, is beneficial to the carrying out of anti-nitration reaction; Mechanical stirrer or impeller under water can be set, to strengthen mixing effect.
Described step 3 is the modes by blast aeration or mechanical aeration, and the mixed solution (dissolved oxygen concentration is higher than 0.5mg/L) under aerobic situation of sewage and mud of controlling well in the oxygen reactor carries out organic matter degradation and the reaction such as nitrated; Microorganism absorbs excessive phosphorus under aerobic situation simultaneously, thereby reduces the phosphorus content of processing in the water outlet.Mixed liquor suspended solid, MLSS (MLSS) concentration is 1000～5000mg/L, and hydraulic detention time is about 3～8 hours, and the organism more than 90% is removed.Quantity of reflux as the mixed solution b of internal recycle is 100%～300%.
Described step 4 is with secondary sedimentation basins mud to be separated with sewage, and 50%～200% sludge reflux is to anaerobic reactor, and excess sludge discharge to mud upgrading unit concentrates.
Described step 5 is with gravity concentration or machinery is concentrated or air supporting is concentrated method, and the water ratio of excess sludge is down to below 97%, greatly reduces the volume of anaerobic digestion unit.
Described step 6 is temperature or the thermophilic digestion mud next by the mud upgrading unit in using.The biosolids residence time (sludge age) of digester is 10 days～30 days.The methane gas that produces as fuel be used for generating electricity, burning boiler, driving device etc. to be to reclaim wherein contained energy, and electric energy and the heat energy of sewage work's operation is provided simultaneously.
Compare with existing method for the treatment of city waste water, the present invention has the following advantages:
1. the present invention adopts return digestion mud to the method for anaerobic reactor or anoxic reacter or aerobic reactor, and making in the sewage more organism is anaerobic degradation in anaerobic sludge digestion unit, thereby produces more methane gas.
2. the present invention is A
2The distortion of/O method dephosphorization and denitrification process has the simple advantage of equal dephosphorization and denitrification effect and technique.
3. the methane gas energy that reclaims by modes such as generatings can be supplied with required electric energy and the heat energy (keeping middle temperature or high temperature sludge digestion) of the operation of whole sewage work fully, thereby is the sewage water dephosphorization denitrification treatment process of zero energy consumption.
4. because the biogas that anaerobic sludge digestion produces is much higher than conventional sewage water treatment method, so sludge yield of the present invention also is significantly less than conventional method for the treatment of city waste water, have the low characteristics of sludge yield.
Description of drawings
Fig. 1 is the synoptic diagram of the Phosphorus Removal from Municipal Wastewater denitrifying method of the low sludge yield of the present invention's zero energy consumption.
Embodiment
The invention provides the sewage water dephosphorization denitrification treatment process of the low sludge yield of a kind of zero energy consumption.The present invention will be described below in conjunction with Fig. 1 illustrative example.
The sewage amount of inlet water is 100,000 tons/day.Then the larger suspended substances of pretreated removal proportion such as municipal effluent at first passes through slightly, fine fack with the active sludge of backflow and the digested sludge that is refluxed by sludge digestion tank, enter anaerobic reactor together.PolyP bacteria discharges the phosphorus in the cell in anaerobic reactor; The mixed solution a of anaerobic reactor water outlet flows into anoxic reacter, and the recurrence rate of internal recycle (mixed solution b) maintains about 200%, to provide anti-nitration reaction required nitric nitrogen; Adopt blast aeration and churned mechanically mode to make sewage and mud in the anoxic reacter fully stir mixing, be beneficial to the carrying out of anti-nitration reaction.Keep the dissolved oxygen of aerobic reactor about 2mg/L, organic biological degradation and nitration reaction carries out smoothly in the assurance sewage.The mixed solution of aerobic reactor water outlet enters secondary sedimentation basins, the active sludge that suspends in the mixed solution and other solid matters here precipitate with moisture from, the sewage after the clarification goes three grades of sewage disposals or discharges system as processing water.In secondary sedimentation basins, 50%～150% sludge reflux is to the aeration tank, and excess sludge discharge to mud upgrading unit concentrates.Excess sludge makes the water ratio of thickened sludge be lower than 97% in the mode of mud upgrading unit by gravity concentration.Thickened sludge is disposed to the anaerobic sludge digester and processes.Mesophilic anaerobic digestion (about 35 ℃) is adopted in sludge digestion.In sludge digestion tank, the organism in the mud is as main biogas and stable mud (digested sludge) take methane by degradation by bacteria under anaerobic.Part digested sludge is back to anaerobic reactor, and part digested sludge is carried out sludge disposal by national requirements after dehydration.
Table 1 has provided in the situation of typical urban sewage (processing the water yield is 100,000 tons/day), and the effluent quality of instance processes of the present invention, the energy and the sewage sludge that are reclaimed by anaerobic sludge digestion are processed the energy that consumes.Thus table as seen, effluent quality reaches the town sewage plant secondary discharge standard, and all the other indexs have reached the emission standard of one-level B except total phosphorus.In the situation of typical urban sewage influent quality, the electric energy that the present invention is reclaimed by methane gas can be supplied with the operation of whole sewage work, and can obtain 0.012kWh/m
3Electric energy surplus and 0.479kWh/m
3The heat energy surplus.And sludge yield of the present invention is 0.07kgVSS/kgBOD, only is half of conventional activated sludge treatment process (0.14kgVSS/kgBOD).
Table 1
aMud is heated to 35 ℃ by 15 ℃.
bTotal energy consumption or unit total energy consumption do not comprise mud heating energy consumption.Mud heating energy consumption can utilize biogas heat energy to obtain, so not very in total energy consumption.
cUnit of electrical energy income=sludge digestion unit of electrical energy productive rate-unit total energy consumption.
Claims (7)
1. the Phosphorus Removal from Municipal Wastewater denitrifying method of the low sludge yield of zero energy consumption, it is characterized in that, comprehensive utilization by anaerobic sludge digestion and biological removal of phosphorus in wastewater denitrogenation, aerobe treatment technology, improve the quantity discharged of methane gas output and reduction digested sludge, thereby electric energy and the heat energy energy consumption of sewage and sludge treatment are provided by the recycling of methane gas energy; Specifically comprise the steps:
(1) next returned sluge enters anaerobic reactor together through pretreated sewage with by secondary sedimentation basins, and the digested sludge that is refluxed by anaerobic sludge digestion unit simultaneously partly or entirely enters anaerobic reactor; In anaerobic reactor, sewage and mud are through aeration or stir formation mixed solution a;
(2) mixed solution a flows into anoxic reacter by anaerobic reactor, and the digested sludge that is refluxed by anaerobic sludge digestion unit simultaneously partly or entirely enters anoxic reacter, and mixed solution b is back to anoxic reacter by aerobic reactor; In anoxic reacter, sewage and mud are through aeration or stir formation mixed solution c;
(3) mixed solution c flows into aerobic reactor by anoxic reacter, and the digested sludge that is refluxed by anaerobic sludge digestion unit simultaneously partly or entirely enters aerobic reactor; The mixed solution b that aerobic reactor flows out is back to anoxic reacter, and mixed solution d enters secondary sedimentation basins;
(4) after mixed solution d enters secondary sedimentation basins, go three grades of sewage disposals or discharge system as water outlet through settled sewage; Mud is discharged from the secondary sedimentation basins bottom, and wherein major part enters anaerobic reactor as returned sluge, and excess sludge discharge is to the mud upgrading unit;
(5) at the mud upgrading unit, thickened sludge is disposed to anaerobic sludge digestion unit and carries out digestion process, and supernatant liquor is back to the sewage pre-treatment;
(6) anaerobic sludge digestion under anaerobic digested sludge of unit is produced as take methane as main biogas and digested sludge; In the discharge mud of anaerobic sludge digestion unit, part digested sludge all is back to anaerobic reactor or anoxic reacter or aerobic reactor, perhaps be back to respectively in proportion anaerobic reactor or anoxic reacter or aerobic reactor, another part digested sludge is carried out sludge dewatering and disposal by national requirements.
2. the Phosphorus Removal from Municipal Wastewater denitrifying method of the low sludge yield of described zero energy consumption according to claim 1, it is characterized in that, described step 6 digested sludge is back to anaerobic reactor or anoxic reacter or aerobic reactor, perhaps is back to respectively in proportion anaerobic reactor or anoxic reacter or aerobic reactor.
3. the Phosphorus Removal from Municipal Wastewater denitrifying method of the low sludge yield of described zero energy consumption according to claim 1 and 2 is characterized in that the digested sludge that described step 1 anaerobic reactor is accepted is from step 6; In anaerobic reactor, the mixed solution of sewage and mud is lower than at dissolved oxygen concentration under the anaerobic status of 0.2mg/L and carries out biochemical reaction.
4. the Phosphorus Removal from Municipal Wastewater denitrifying method of the low sludge yield of described zero energy consumption according to claim 1 and 2 is characterized in that the digested sludge that described step 2 anoxic reacter is accepted is from step 6; In anoxic reacter, the mixed solution of sewage and mud is lower than at dissolved oxygen concentration under the anoxic conditions of 0.5mg/L and carries out biochemical reaction.
5. the Phosphorus Removal from Municipal Wastewater denitrifying method of the low sludge yield of described zero energy consumption according to claim 1 is characterized in that the digested sludge that described step 3 aerobic reactor is accepted is from step 6; In aerobic reactor, the mixed solution of sewage and mud is higher than at dissolved oxygen concentration under the aerobic situation of 0.5mg/L and carries out biochemical reaction.
6. the Phosphorus Removal from Municipal Wastewater denitrifying method of the low sludge yield of described zero energy consumption according to claim 1 is characterized in that described step 4 secondary sedimentation basins separates mud with sewage.
7. the Phosphorus Removal from Municipal Wastewater denitrifying method of the low sludge yield of described zero energy consumption according to claim 1 is characterized in that, described step 5 is with gravity concentration or machinery is concentrated or air supporting is concentrated method, reduces the water ratio of mud.
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| CN102633402A (en) * | 2011-04-07 | 2012-08-15 | 上海问鼎水处理工程有限公司 | Method for treating chitin waste water |
| CN102701451B (en) * | 2012-05-29 | 2014-05-07 | 东南大学 | PTA (purified terephthalic acid) sludge reducing method |
| CN102976554A (en) * | 2012-11-23 | 2013-03-20 | 中国市政工程东北设计研究总院 | Pollutant comprehensive treatment system |
| CN103833135B (en) * | 2014-03-07 | 2016-07-06 | 浦华环保股份有限公司 | Activated sludge sewage-treatment plant and sewage treatment process |
| CN104261561A (en) * | 2014-09-25 | 2015-01-07 | 扬州大学 | Sequencing batch reactor activated sludge process (SBR) with low yield of sludge and low energy consumption |
| CN104843866A (en) * | 2015-05-11 | 2015-08-19 | 扬州大学 | Sewage disposal method with low sludge yield and low energy consumption |
| CN108862828A (en) * | 2018-06-22 | 2018-11-23 | 即墨市污水处理有限公司 | A kind of municipal sewage denitrogenation dephosphorizing treatment process |
| CN109592784A (en) * | 2018-12-18 | 2019-04-09 | 武汉理工大学 | A kind of electromagnetic wave technology promotes the system and method for AAO process spent water treatment effect |
| CN109607784B (en) * | 2018-12-18 | 2021-03-30 | 武汉理工大学 | Method for electromagnetic wave loading backflow sludge regulation and control system microbial community structure |
| CN110002681B (en) * | 2019-04-23 | 2022-03-29 | 北京工业大学 | Sludge side stream treatment device and method based on nitrite-enhanced sludge fermentation |
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| US5013442A (en) * | 1990-02-09 | 1991-05-07 | Davis Water & Waste Industries, Inc. | Aerobic wastewater treatment with alkalinity control |
| CN101575159B (en) * | 2009-06-12 | 2011-04-20 | 哈尔滨工业大学 | Method of intensified denitrification and dephosphorization of urban sewage |
| CN101691268A (en) * | 2009-09-17 | 2010-04-07 | 上海市政工程设计研究总院 | Biochemical reaction tank and denitrification and dephosphorization process thereof |
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