CN101935130B - Zero-energy consumption and low sludge yield method for denitrifying urban sewage - Google Patents
Zero-energy consumption and low sludge yield method for denitrifying urban sewage Download PDFInfo
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- CN101935130B CN101935130B CN2010102088856A CN201010208885A CN101935130B CN 101935130 B CN101935130 B CN 101935130B CN 2010102088856 A CN2010102088856 A CN 2010102088856A CN 201010208885 A CN201010208885 A CN 201010208885A CN 101935130 B CN101935130 B CN 101935130B
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
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Abstract
The invention discloses a method for denitrifying urban sewage, relates to sewage treatment technology and discloses a zero-energy consumption and low sludge yield method for denitrifying urban sewage. The method comprises the following steps of: allowing pretreated urban sewage, refluent mixed liquid from an aerobic aeration tank and refluent digested sludge to enter an anoxic tank at the same time for undergoing biochemical reactions such as denitrification and the like; allowing water discharged from the anoxic tank to enter the aerobic aeration tank for undergoing degradation and nitration reactions of organisms; allowing the mixed liquid discharged from the aerobic aeration tank to enter a secondary sedimentation tank for separating sludge from water; concentrating remaining active sludge and discharging the concentrated sludge into an anaerobic sludge digestion unit for digesting; and digesting the sludge under an anaerobic condition by using the anaerobic sludge digestion unit, wherein a part of digested sludge flows back to the anoxic tank or the aerobic aeration tank or flows back to the anoxic tank and the aerobic aeration tank according to proportion respectively while the other part of digested sludge is dehydrated and undergoes sludge treatment.
Description
Technical field
The invention belongs to a kind of sewage disposal technology, specifically relate to a kind of 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 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 municipal effluent denitrifying method 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 water denitrification 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) returned sluge that comes through pretreated municipal effluent, by secondary sedimentation basins and the mixed solution b that is come by the aerobic aeration pond get into anoxic pond, and the digested sludge that is refluxed by the sludge digestion unit simultaneously partly or entirely gets into anoxic pond.Sewage and mud are through aeration or stir formation mixed solution a.
(2) mixed solution a gets into the aerobic aeration pond by anoxic 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 in aerobic aeration pond, a part (mixed solution b) is back to anoxic pond, and a part (mixed solution c) gets into secondary sedimentation basins in addition.
(3) after mixed solution c gets into secondary sedimentation basins, go three grades of WWTs or discharge system as water outlet through settled sewage; Mud is discharged from the secondary sedimentation basins bottom, and is wherein most of as returned sluge entering anoxic 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.Moisture in the removed mud (like supernatant) is back to sewage pre-treatment or anoxic pond.
(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 anoxic pond or aerobic aeration pond, perhaps is back to anoxic 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 anoxic pond is accepted the sewage that the sewage pre-treatment comes, and mixed solution b provides required nitrate nitrogen of anti-nitration reaction and nitrous acid nitrogen.Dissolved oxygen concentration in the anoxic pond is controlled at and is 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 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 in the aerobic aeration tank mixed solution (dissolved oxygen concentration is higher than 0.5mg/L) under aerobic situation of sewage and mud and carries out organic matter degradation and reaction such as nitrated; Anoxic pond and aerobic aeration tank also can be built jointly in a reactor drum, but separate with dividing plate the centre.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.Quantity of reflux as the mixed solution b of internal recycle is 100%～300%.
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 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 anoxic 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 method denitrification process, has its identical denitrification 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 denitrifying method of the low sludge yield of the present invention's zero energy consumption.
Embodiment
The present invention provides the sewage water denitrification handling 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.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 anoxic pond then together; The recurrence rate of internal recycle (mixed solution b) maintains about 150%, to provide anti-nitration reaction required nitric nitrogen; Adopt blast aeration and churned mechanically mode to make sewage and mud in the anoxic pond fully stir mixing, be beneficial to the carrying out of anti-nitration reaction.The dissolved oxygen of keeping the aerobic aeration pond is about 2mg/L, and organic biological degradation and nitration reaction carries out smoothly 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%～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.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 anoxic 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 all the other indexs have reached the emission standard of one-level B except that total phosphorus; 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 0.336kWh; 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 0.357kWh.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 0.002kWh/m
3Electric energy surplus and 0.287kWh/m
3The heat energy surplus; Under the situation of typical urban sewage, the present invention can obtain the electric energy surplus of 0.019kWh/m3 and the heat energy surplus of 0.407kWh/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 conventional activated 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 municipal effluent denitrifying method of the one kind zero low sludge yield of energy consumption; It is characterized in that; Comprehensive utilization through anaerobic sludge digestion and sewage anoxic denitrification, aerobe treatment technology; Improve biogas gas output and the quantity discharged that reduces digested sludge, thereby the electric energy and the heat energy energy consumption of sewage and sludge treatment are provided through the recycling of methane gas energy; Specifically comprise the steps:
The mixed solution b entering anoxic pond of (1) passing through pretreated sewage, the returned sluge that comes by secondary sedimentation basins and coming by the aerobic aeration pond; The digested sludge that is refluxed by anaerobic sludge digestion unit simultaneously partly or entirely gets into anoxic pond, and sewage and mud are through aeration or stir formation mixed solution a;
(2) mixed solution a gets into the aerobic aeration pond by anoxic 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 a part of mixed solution b in aerobic aeration pond is back to anoxic pond, and a part of mixed solution c gets into secondary sedimentation basins;
(3) after mixed solution c gets into secondary sedimentation basins, go three grades of WWTs or discharge system as water outlet through settled sewage; Mud is discharged from the secondary sedimentation basins bottom, and is wherein most of as returned sluge entering anoxic 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 sewage pre-treatment or anoxic pond;
(5) anaerobic sludge digestion unit digested sludge under anaerobic, being produced as with methane is main biogas and digested sludge; Digest in the unitary discharge mud at anaerobic sludge, a part of digested sludge is back to anoxic pond or aerobic aeration pond, perhaps is back to anoxic 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 denitrifying method 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 anoxic pond or aerobic aeration pond, perhaps be back to anoxic pond and aerobic aeration tank in proportion respectively.
3. according to the municipal effluent denitrifying method 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 anoxic pond is accepted is from step 5; In anoxic pond, 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.
4. according to the municipal effluent denitrifying method 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 aerobic aeration pond is accepted is from step 5 or from step 1, perhaps simultaneously from step 5 and step 1; In the aerobic aeration pond, 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.
5. according to the municipal effluent denitrifying method 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; Most mud is back to anoxic pond, and excess sludge discharge to mud upgrading unit concentrates.
6. according to the municipal effluent denitrifying method 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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| CN102701451B (en) * | 2012-05-29 | 2014-05-07 | 东南大学 | PTA (purified terephthalic acid) sludge reducing method |
| 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 |
| CN104986854B (en) * | 2015-07-07 | 2017-04-05 | 北京中斯水灵水处理技术有限公司 | Sludge reflux control system, method and sewage disposal system |
| CN111170557A (en) * | 2020-01-03 | 2020-05-19 | 昆山水清华环保科技有限公司 | Domestic sewage treatment process |
| CN111704315B (en) * | 2020-06-16 | 2022-11-29 | 沈阳环境科学研究院 | High-nitrogen high-concentration organic wastewater treatment system and method for realizing same |
| CN112174317A (en) * | 2020-07-20 | 2021-01-05 | 北京工业大学 | Device and method for side flow enhanced biological phosphorus removal process based on carbon source development in excess sludge |
| CN115321750B (en) * | 2022-08-04 | 2023-09-22 | 贵州楚天两江环境股份有限公司 | Sewage micro-power AO integrated equipment |
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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 |
| CN2883356Y (en) * | 2006-01-17 | 2007-03-28 | 彭永臻 | On-line controller of continuous flow biological denitrogenation techn nitration procedue |
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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 |
| CN2883356Y (en) * | 2006-01-17 | 2007-03-28 | 彭永臻 | On-line controller of continuous flow biological denitrogenation techn nitration procedue |
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