CN101935131B - Municipal sewage treatment method with zero energy consumption low sludge yield - Google Patents
Municipal sewage treatment method with zero energy consumption low sludge yield Download PDFInfo
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- CN101935131B CN101935131B CN2010102088926A CN201010208892A CN101935131B CN 101935131 B CN101935131 B CN 101935131B CN 2010102088926 A CN2010102088926 A CN 2010102088926A CN 201010208892 A CN201010208892 A CN 201010208892A CN 101935131 B CN101935131 B CN 101935131B
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Abstract
The invention relates to a sewage treatment method, relating to a sewage treatment technology. The invention discloses a municipal sewage treatment method with zero energy consumption low sludge yield, which comprises the following steps of: leading pretreated municipal sewage into a primary sedimentation basin, and leading the outlet water of the primary sedimentation basin and active backflow sludge of a secondary sedimentation basin into an aeration basin together to form a mixed liquid; leading the mixed liquid of outlet water from the aeration basin into the secondary sedimentation basin, and leading the sedimented and clarified sewage to tertiary sewage treatment or discharging as treatment water; and concentrating the residual active sludge, and discharging the concentrated sludge to an anaerobic sludge digestion unit for digestion treatment. The anaerobic sludge digestion unit digests the sludge under anaerobic conditions, and one part of digested sludge flows back to the aeration basin or the primary sedimentation basin or flows back to the aeration basin and the primary sedimentation basin proportionally; the other part of digested sludge is treated after dehydration. The energy of methane gas is recycled so as to provide energy (electric energy and thermal energy) for sewage and sludge treatment.
Description
Technical field
The invention belongs to a kind of sewage disposal technology, specifically relate to a kind of 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 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
The object of the present invention is to provide the method for treating city waste water of the low sludge yield of a kind of zero energy consumption.It is characterized in that; Comprehensive utilization through anaerobic sludge digestion and sewage aerobic treatment technology; Improve biogas gas output and the quantity discharged that reduces digested sludge, thereby the energy consumption (electric energy and heat energy) of sewage and sludge treatment can be provided fully through the recycling of methane gas energy.Specifically comprise the steps:
(1) getting into primary sedimentation pond through pretreated sewage and handle, in the sewage is that the big suspended solid of specific density of main body is removed under action of gravity with the inorganics.Simultaneously, the digested sludge that is refluxed by the sludge digestion unit partly or entirely gets into primary sedimentation pond.
(2) primary sedimentation pond water outlet and get into the aeration tank together by the returned sluge that secondary sedimentation basins refluxes and forms mixed solution, the digested sludge by the backflow of sludge digestion unit simultaneously partly or entirely gets into the aeration tank.Aeration adopts the mode of blast aeration or mechanical aeration, and purpose is the dissolved oxygen content that increases in the sewage, and makes mixed solution be in the state of vigorous agitation, shape suspended state.The fluidised form of aeration tank is a pulling flow type or hybrid fully, and it is hybrid also to can be circulation.
(3) mixed solution of aeration tank 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 water outlet.Discharge from the settling tank bottom through the spissated mud of deposition, wherein major part is back to the aeration tank as returned sluge, to guarantee suspended sediment concentration and the microorganism concn in the aeration tank; Excess sludge discharge to mud upgrading unit carries out concentration.
(4) excess sludge concentrates or centrifugal spissated mode through gravity at the mud upgrading unit, or adopts the spissated mode of air supporting, to reach the purpose that lowers sludge moisture content.Moisture in the removed mud (like supernatant) is back to sewage pretreatment unit or primary sedimentation pond or aeration tank.Thickened sludge is disposed to anaerobic sludge digestion unit and handles.
(5) in anaerobic sludge digestion unit, the organism in the thickened sludge is to be master's biogas and stable mud (digested sludge) with methane by degradation by bacteria under anaerobic.Temperature or thermophilic digestion during sludge digestion is adopted.In the unitary discharge mud of sludge digestion, a part of digested sludge is back to aeration tank or primary sedimentation pond, perhaps is back to aeration tank and primary sedimentation pond in proportion respectively; Another part digested sludge is carried out sludge disposal by national requirements after dewatering.
Said step 1 is the water that comes that primary sedimentation pond is accepted the sewage pretreatment unit, and inorganic particle that the suspended substance that volume is bigger, swimmer and proportion are bigger and grease can be removed by pretreatment unit, to alleviate the burden of subsequent technique.Primary sedimentation pond is handled as the sewage one-level, can be used as the part of pretreatment unit.
Said step 2 is to be the active sludge treatment sewage of 1000～5000mg/L with mixed liquor suspended solid, MLSS (MLSS) concentration, and hydraulic detention time is about 3～10 hours, and the organism more than 90% is removed.Whole aeration tank can be oxygen condition; Perhaps, in the aeration tank, form anaerobism section, anoxic section and aerobic section through the control dissolved oxygen content, perhaps only anoxic section and aerobic section, thereby be beneficial to biological respinses such as denitrification and nitration reaction carrying out.
Said step 3 is with secondary sedimentation basins mud to be separated with sewage, and 50%～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 mud 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 for return digestion mud to aeration tank or primary sedimentation pond, and making in the sewage more organism is anaerobic degradation in sludge digestion tank, thereby produces more methane gas.
2. 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.
3. 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 method for treating city waste water of the low sludge yield of the present invention's zero energy consumption.
Embodiment
The present invention provides the sewage water treatment method 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.Pretreated municipal effluents such as process is thick, fine fack at first get into primary sedimentation pond and remove the bigger suspended particle of proportion; The active sludge of primary sedimentation pond water outlet and backflow and by the digested sludge that sludge digestion tank refluxes gets into the aeration tank together and forms mixed solution then.The mode of blast aeration is adopted in the aeration tank, makes mixed solution be in the state of vigorous agitation, shape suspended state.Through control aeration tank dissolved oxygen content, make aeration tank leading portion dissolved oxygen content about 0.2mg/L, form the carrying out that the anoxic section is beneficial to denitrification reaction.The dissolved oxygen of keeping the aeration tank back segment is about 2mg/L, and organic biological degradation and nitration reaction carries out smoothly in the assurance sewage.The mixed solution of aeration tank 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%～150% 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.The supernatant of concentration basin is back to the sewage pretreatment unit and mixes back entering primary sedimentation pond with sewage.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 the aeration tank, 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; Under the situation of low concentration municipal wastewater (water inlet BOD is 150mg/L), 1 ton of sewage of the every processing of the present invention can obtain the electric energy of 0.278kWh; Under the situation of typical urban sewage (water inlet BOD is 300mg/L), 1 ton of sewage of the every processing of the present invention can obtain the electric energy of 0.325kWh.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 0.018kWh/m
3Electric energy surplus and 0.238kWh/m
3The heat energy surplus; Under the situation of typical urban sewage, the present invention can obtain the electric energy surplus of 0.054kWh/m3 and the heat energy surplus of 0.370kWh/m3.And sludge yield of the present invention has only 0.08kgVSS/kgBOD (low concentration municipal wastewater) and 0.07kgVSS/kgBOD (typical urban sewage), is significantly less than the traditional active sludge treatment process.
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 biogas heat energy capable of using obtains, so not very in total energy consumption.
Claims (6)
1. the method for treating city waste water of the one kind zero low sludge yield of energy consumption; It is characterized in that; Comprehensive utilization through anaerobic sludge digestion and sewage aerobic treatment technology; Improve biogas gas output and the quantity discharged that reduces digested sludge, thereby the energy consumption of sewage and sludge treatment can be provided through the recycling of methane gas energy; Specifically comprise the steps:
(1) get into primary sedimentation pond through pretreated municipal effluent and handle, the digested sludge that is refluxed by sludge digestion tank simultaneously partly or entirely gets into primary sedimentation pond;
(2) primary sedimentation pond water outlet and get into the aeration tank together by the returned sluge that secondary sedimentation basins refluxes and forms mixed solution, the digested sludge by the backflow of sludge digestion unit simultaneously partly or entirely gets into the aeration tank;
(3) mixed solution of aeration tank 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; Mud is discharged from the secondary sedimentation basins bottom, and is wherein most of as returned sluge entering aeration tank, 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 sewage pretreatment unit or primary sedimentation pond or aeration tank;
(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 aeration tank or primary sedimentation pond, perhaps is back to aeration tank and primary sedimentation pond in proportion respectively; Another part digested sludge is carried out sludge dewatering and disposal by national requirements.
2. according to the method for treating city waste water of the low sludge yield of said zero energy consumption of claim 1, it is characterized in that said step 5 digested sludge is back to aeration tank or primary sedimentation pond, perhaps be back to aeration tank and primary sedimentation pond in proportion respectively.
3. according to the method for treating city waste water of claim 1 or the low sludge yield of 2 said zero energy consumptions, it is characterized in that the digested sludge that said step 1 primary sedimentation pond is accepted is from step 5; Simultaneously, get into primary sedimentation pond through pretreated municipal effluent.
4. according to the method for treating city waste water of claim 1 or the low sludge yield of 2 said zero energy consumptions, it is characterized in that the digested sludge that said step 2 aeration tank is accepted is from step 5 or from step 1, perhaps simultaneously from step 5 and step 1; In the aeration tank, the mixed solution of sewage and mud carries out biochemical reaction under aerobic or anoxybiotic situation.
5. according to the method for treating city waste water of the low sludge yield of said zero energy consumption of claim 1, it is characterized in that said step 3 secondary sedimentation basins separates mud with sewage.
6. according to the method for treating city waste water of the low sludge yield 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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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102225825B (en) * | 2011-05-09 | 2013-05-01 | 余静 | Zero-energy-consumption enhanced AB (adsorption-biodegradation) treatment method for urban sewage |
| CN102718380B (en) * | 2012-07-09 | 2014-03-19 | 中山大学 | Method and device for reduction treatment of residual sludge |
| CN103112964B (en) * | 2013-01-25 | 2014-06-11 | 陈骐 | Wastewater treatment system and technological process of wastewater treatment |
| CN104529071A (en) * | 2014-12-24 | 2015-04-22 | 北京桑德环境工程有限公司 | System and method for treating village sewage |
| 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 |
| CN107043199B (en) * | 2017-05-05 | 2020-07-17 | 河南恒安环保科技有限公司 | Hospital wastewater treatment and resource recovery method |
| CN107522353A (en) * | 2017-08-17 | 2017-12-29 | 河海大学 | A kind of activated sludge membrane capacitance Integrated Processing Unit and technique that high-salt wastewater is handled using Facultative Halophiles |
| CN111661974A (en) * | 2019-03-07 | 2020-09-15 | 山东三加环保新材料有限公司 | Sewage treatment process |
| CN111039397B (en) * | 2020-01-07 | 2021-07-13 | 山东华立供水设备有限公司 | Municipal administration sewage treatment system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1412134A (en) * | 2002-12-13 | 2003-04-23 | 南开大学 | Urban domestic sewage treatment process and its method |
| CN1554603A (en) * | 2003-12-23 | 2004-12-15 | 南开大学 | Process and method for treating city waste warter |
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| KR20100136989A (en) * | 2008-03-28 | 2010-12-29 | 지멘스 워터 테크놀로지스 코포레이션 | Hybrid aerobic and anaerobic wastewater and sludge treatment systems and methods |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1412134A (en) * | 2002-12-13 | 2003-04-23 | 南开大学 | Urban domestic sewage treatment process and its method |
| CN1554603A (en) * | 2003-12-23 | 2004-12-15 | 南开大学 | Process and method for treating city waste warter |
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