CN101973672B - Zero-energy consumption urban sewage dephosphorization treatment method - Google Patents
Zero-energy consumption urban sewage dephosphorization treatment method Download PDFInfo
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- CN101973672B CN101973672B CN2010105086778A CN201010508677A CN101973672B CN 101973672 B CN101973672 B CN 101973672B CN 2010105086778 A CN2010105086778 A CN 2010105086778A CN 201010508677 A CN201010508677 A CN 201010508677A CN 101973672 B CN101973672 B CN 101973672B
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/30—Fuel from waste, e.g. synthetic alcohol or diesel
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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
- Y02W10/10—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
- Y02W10/20—Sludge processing
Abstract
The invention relates to an urban sewage dephosphorization treatment method, in particular to a sewage treatment technology. The invention discloses a zero-energy consumption urban sewage dephosphorization treatment method, which comprises the following steps: leading urban sewage after pretreatment and returned digested sludge to enter into an anaerobic tank together for carrying out biochemical reaction; leading effluent from the anaerobic tank to enter into an aerobic aeration tank to carry out degradation of organic matters and reaction of phosphorus uptake of phosphorus-accumulating bacteria; leading mixed liquor of the effluent from the aerobic aeration tank to enter into a secondary sedimentation tank for carrying out sludge-water separation; carrying out sludge concentration on the remaining activated sludge, and then discharging the concentrated sludge to an anaerobic sludge digestion unit for carrying out digestion treatment; and leading the anaerobic sludge digestion unit to digest the sludge under anaerobic conditions, leading one part of the digested sludge to return to the anaerobic tank or the aerobic aeration tank, or leading one part of the digester sludge to return to an anoxic tank and the aerobic aeration tank respectively according to proportion, and leading the other part of the digested sludge to carry out sludge disposal after dehydration.
Description
Technical field
The invention belongs to a kind of sewage disposal technology, specifically relate to a kind of zero energy consumption dephosphorization treatment process 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 discharged volume of industrial waste water first 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 the current energy dilemma of China on the other hand to a certain extent.Therefore, carry out the energy-saving and cost-reducing Study on Technology in municipal sewage plant and become the task of top priority.The energy consumption expenditure of municipal sewage plant generally includes 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 treatment and disposal, auxiliary building electricity consumption and plant area's illumination of mud, and wherein about 40%～50% power consumption is used 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 techniques evolutionary path.Sludge from wastewater treatment plant mainly is made up 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 is bulky, and organic content is up to 50%～70%, and character is unstable.Owing to concentrate/anaerobic digestion/dewatering process can be realized sludge reduction and stabilization simultaneously, and with callable combustion gas (methane) generation, final mud can be used as agricultural fertile reuse, so be used widely.
USP (US patent application no.20080223783) has been invented a kind of Sewage treatment systems of being made up of aerobic membrane bioreactor and anaerobic sludge digestion.Excess sludge gets into 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
A kind of municipal effluent dephosphorization treatment process of zero energy consumption.It is characterized in that the comprehensive utilization through anaerobic sludge digestion and anerobic sowage, aerobe dephosphorization treatment technology improves biogas gas output greatly, thereby through the recycling of methane gas energy the energy consumption (electric energy and heat energy) of sewage and sludge treatment can be provided.Specifically comprise the steps:
(1) next returned sluge gets into anaerobic pond through pretreated sewage with by secondary sedimentation basins, and the digested sludge that is refluxed by anaerobic sludge digestion unit simultaneously partly or entirely gets into anaerobic pond, and sewage and mud form mixed solution a through stirring or aeration.
(2) mixed solution a gets into the aerobic aeration pond by anaerobic pond, and the digested sludge that is refluxed by anaerobic sludge digestion unit simultaneously partly or entirely gets into the aerobic aeration pond; The effusive mixed solution b in aerobic aeration pond gets into secondary sedimentation basins.
(3) after mixed solution b gets into secondary sedimentation basins, discharge system or go three grades of WWTs as water outlet through settled sewage; Mud is discharged from the secondary sedimentation basins bottom, and is wherein most of as returned sluge entering anaerobic pond, excess sludge discharge to mud upgrading unit.
(4) at the mud upgrading unit, thickened sludge is disposed to anaerobic sludge digestion unit and carries out digestion process, and the moisture in the removed mud (like supernatant) is back to the sewage pre-treatment.
(5) anaerobic sludge digestion unit digested sludge under anaerobic, being produced as with methane is main biogas and digested sludge; In the unitary discharge mud of sludge digestion, a part of digested sludge is back to anaerobic pond or aerobic aeration pond, perhaps is back to anaerobic pond and aerobic aeration tank in proportion respectively; Another part digested sludge is carried out sludge dewatering and disposal by national requirements.
Said step 1 is that anaerobic pond is accepted the sewage that the sewage pre-treatment comes, and the dissolved oxygen concentration in the anaerobic pond is controlled at and is lower than 0.2mg/L, is beneficial to polyP bacteria releases phosphorus under anaerobic; Mechanical stirrer or impeller under water can be set, to strengthen the effect that mixes; The sewage pre-treatment can comprise coarse rack, fine fack, settling pit and preliminary sedimentation tank etc., in order to remove bigger bigger inorganic particle and the grease of suspended substance, swimmer and proportion of volume, to alleviate the burden of subsequent technique.
Said step 2 is the modes through blast aeration or mechanical aeration, controls that the mixed solution (dissolved oxygen concentration is higher than 0.5mg/L) under aerobic situation of sewage and mud carries out the reaction of the picked-up phosphorus of organic matter degradation and polyP bacteria in the aerobic aeration tank; Mixed liquor suspended solid, MLSS (MLSS) concentration is 1000～5000mg/L, and hydraulic detention time is about 3～10 hours, and the organism more than 90% is removed.
Said step 3 is with secondary sedimentation basins mud to be separated with sewage, and 40%～200% mud is back to the aeration tank, and excess sludge discharge to mud upgrading unit concentrates.
Said step 4 is to concentrate or the concentrated perhaps spissated method of air supporting of machinery with gravity, and the water ratio of excess sludge is reduced to below 97%, reduces the volume of anaerobic digester greatly.
Said step 5 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 the electric energy and the heat energy of sewage work's operation is provided simultaneously.
Compare with existing method of treating city waste water, the present invention has the following advantages:
1. the present invention adopts the method in return digestion mud to anaerobic pond or aerobic aeration pond, and making in the sewage more organism is anaerobic degradation in sludge digestion tank, thereby produces more methane gas.
2. the present invention is the distortion of A/O (aerobic/anaerobic) method dephosphorization process, has its identical phosphor-removing effect and advantage of simple technology.
3. the methane gas energy that reclaims through modes such as generatings can be supplied with the required electric energy and the heat energy (temperature or high temperature sludge digestion in keeping) of the operation of entire sewage treatment plant fully, thereby be the sewage water treatment method of zero energy consumption.
4. because the biogas that anaerobic sludge digestion produces is much higher than conventional sewage water treatment method,, have the low characteristics of sludge yield so sludge yield of the present invention also is significantly less than conventional method of treating city waste water.
Description of drawings
Fig. 1 is the synoptic diagram of the municipal effluent dephosphorization treatment process of the present invention's zero energy consumption.
Embodiment
The present invention provides a kind of municipal effluent dephosphorization treatment process 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.The bigger 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, get into anaerobic pond then together; Adopt blast aeration and churned mechanically mode to make sewage and mud in the anaerobic pond fully stir mixing, control dissolved oxygen concentration simultaneously below 0.2mg/L, be beneficial to the biochemical reaction of the releases phosphorus of polyP bacteria.The dissolved oxygen of keeping the aerobic aeration pond is about 2mg/L, and the successful reaction of the picked-up phosphorus of organic biological degradation and polyP bacteria is carried out in the assurance sewage.The mixed solution of aerobic aeration pond water outlet gets into secondary sedimentation basins, and the active sludge that suspends in the mixed solution here precipitates and water sepn with other solid matters, and the sewage after the clarification goes three grades of WWTs or discharges system as treating water.In secondary sedimentation basins, 50%～100% mud is back to the aeration tank, and excess sludge discharge to mud upgrading unit concentrates.Excess sludge through the spissated mode of gravity, makes the water ratio of thickened sludge be lower than 97% at the mud upgrading unit.Thickened sludge is disposed to the anaerobic sludge digester and handles.Anaeration in normal temperature digestion (about 35 ℃) is adopted in sludge digestion.In sludge digestion tank, the organism in the mud is to be master's biogas and stable mud (digested sludge) with methane by degradation by bacteria under anaerobic.Part digested sludge is back to anaerobic pond, and part digested sludge is carried out sludge disposal by national requirements after dewatering.
Table 1 has provided under the situation of low concentration municipal wastewater and typical urban sewage (handling 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 handled the energy that consumes.Table is visible thus, and effluent quality reaches the town sewage plant secondary discharge standard, and total phosphorus go out the emission standard that water concentration has reached one-level B; Under the situation of low concentration municipal wastewater (water inlet BOD is 100mg/L), 1 ton of sewage of the every processing of the present invention can obtain the electric energy of 0.199kWh; Under the situation of typical urban sewage (water inlet BOD is 190mg/L), 1 ton of sewage of the every processing of the present invention can obtain the electric energy of 0.278kWh.Therefore, after the energy consumption of deduction sewage and sludge treatment, under the situation of low concentration municipal wastewater, the present invention still can obtain the electric energy surplus of 0.002kWh/m3 and the heat energy surplus of 0.066kWh/m3; Under the situation of typical urban sewage, the present invention can obtain the electric energy surplus of 0.033kWh/m3 and the heat energy surplus of 0.185kWh/m3.And sludge yield of the present invention has only 0.15kgVSS/kgBOD (low concentration municipal wastewater) and 0.14kgVSS/kgBOD (typical urban sewage), is significantly less than the conventional activated sludge treatment process.
Table 1.
The A/O method refers to aerobic/anaerobic biological phosphate-eliminating method.
aThe mud heating 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 biogas heat energy capable of using obtains, so not very in total energy consumption.
Claims (6)
1. the municipal effluent dephosphorization treatment process of one kind zero energy consumption; It is characterized in that; Comprehensive utilization through anaerobic sludge digestion and anerobic sowage, aerobe dephosphorization treatment technology; Improve biogas gas output greatly, thereby the electric energy and the heat energy of sewage and sludge treatment are provided through the recycling of methane gas energy; Specifically comprise the steps:
(1) next returned sluge gets into anaerobic pond through pretreated sewage with by secondary sedimentation basins, and the digested sludge that is refluxed by anaerobic sludge digestion unit simultaneously partly or entirely gets into anaerobic pond, and sewage and mud form mixed solution a through stirring or aeration;
(2) mixed solution a gets into the aerobic aeration pond by anaerobic pond, and the digested sludge that is refluxed by anaerobic sludge digestion unit simultaneously partly or entirely gets into the aerobic aeration pond; The effusive mixed solution b in aerobic aeration pond gets into secondary sedimentation basins;
(3) after mixed solution b gets into secondary sedimentation basins, discharge system or go three grades of WWTs as water outlet through settled sewage; Mud is discharged from the secondary sedimentation basins bottom, and is wherein most of as returned sluge entering anaerobic pond, excess sludge discharge to mud upgrading unit;
(4) at the mud upgrading unit, thickened sludge is disposed to anaerobic sludge digestion unit and carries out digestion process, and supernatant is back to the sewage pre-treatment;
(5) anaerobic sludge digestion unit digested sludge under anaerobic, being produced as with methane is main biogas and digested sludge; In the unitary discharge mud of sludge digestion, a part of digested sludge is back to anaerobic pond or aerobic aeration pond, perhaps is back to anaerobic pond and aerobic aeration tank in proportion respectively; Another part digested sludge is carried out sludge dewatering and disposal by national requirements.
2. according to the municipal effluent dephosphorization treatment process of said zero energy consumption of claim 1, it is characterized in that said step 5 digested sludge is back to anaerobic pond or aerobic aeration pond, perhaps be back to anaerobic pond and aerobic aeration tank in proportion respectively.
3. according to the municipal effluent dephosphorization treatment process of claim 1 or 2 said zero energy consumptions, it is characterized in that the digested sludge that said step 1 anaerobic pond is accepted is from step 5; The mixed solution of sewage and mud carries out biochemical reaction under the anaerobic situation.
4. according to the municipal effluent dephosphorization treatment process of claim 1 or 2 said zero energy consumptions, it is characterized in that the digested sludge that said step 2 aerobic aeration pond is accepted is from step 5 or from step 1, perhaps simultaneously from step 5 and step 1; The mixed solution of sewage and mud carries out biochemical reaction under aerobic situation.
5. according to the municipal effluent dephosphorization treatment process of said zero energy consumption of claim 1, it is characterized in that said step 3 secondary sedimentation basins separates mud with sewage, most mud is back to anaerobic pond, and excess sludge discharge to mud upgrading unit concentrates.
6. according to the municipal effluent dephosphorization treatment process of said zero energy consumption of claim 1, it is characterized in that said step 4 is to concentrate or mechanical concentrating or the spissated method of air supporting with gravity, reduces the water ratio of mud.
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| CN102502963B (en) * | 2011-11-04 | 2013-07-10 | 浦华环保有限公司 | Multi-mode sequencing batch active sludge sewage treatment method and system |
| CN102826723B (en) * | 2012-09-20 | 2014-01-22 | 江苏艾特克环境工程有限公司 | Treatment method for urban sanitary sewage |
| CN103015457B (en) * | 2012-12-03 | 2015-07-22 | 常州大学 | Method for building rural brick buried sewage treatment facility |
| 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 |
| CN104803546B (en) * | 2015-03-25 | 2017-02-01 | 中国电器科学研究院有限公司 | Technology for reducing and recycling treatment of sludge of sewage treatment plant |
| CN104891754B (en) * | 2015-07-09 | 2016-09-28 | 王洪臣 | A kind of sewage treatment process and sewage disposal system |
| CN106630144A (en) * | 2016-11-22 | 2017-05-10 | 河北工程大学 | Multipoint water-in sludge in-situ reduction synchronous coupling nitrogen and phosphorus removal method |
| CN108689490B (en) * | 2017-04-12 | 2023-06-30 | 中山大学 | Wastewater and sludge anaerobic decrement treatment integrated device and use method thereof |
| CN107555714A (en) * | 2017-09-18 | 2018-01-09 | 福建省爱善环保科技有限公司 | A kind of sewage and mud activity flora repair process device |
| CN107399892B (en) * | 2017-09-21 | 2020-04-21 | 河北文悦环保科技有限公司 | Efficient sludge biochemical decrement method in sewage treatment process |
| CN108689495A (en) * | 2018-07-17 | 2018-10-23 | 高密天福家纺有限公司 | A kind of sewage disposal system and method for low sludge yield |
| CN113480096A (en) * | 2021-07-13 | 2021-10-08 | 西安建筑科技大学 | Sewage treatment system and process for step-by-step backflow and double circulation of biological activated sludge |
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| CN1162360C (en) * | 2000-11-30 | 2004-08-18 | 杨主民 | Process for treating sewage of oil recovery |
| CN1194910C (en) * | 2001-09-21 | 2005-03-30 | 重庆康达环保股份有限公司 | Improved oxidation channel city sewage treamtent process |
| CN1210216C (en) * | 2002-12-13 | 2005-07-13 | 南开大学 | Urban domestic sewage treatment process and its method |
| US7713417B2 (en) * | 2007-03-16 | 2010-05-11 | Envirogen Technologies, Inc. | Method for wastewater treatment with resource recovery and reduced residual solids generation |
| CN101357815B (en) * | 2008-08-14 | 2010-08-11 | 北京环利科环境工程技术有限公司 | EH-BFB biochemical denitrification dephosphorization technique |
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