CN102001784B - High efficiency low energy consumption urban sewage dephosphorization denitrification treatment method - Google Patents
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- 239000010865 sewage Substances 0.000 title claims abstract description 51
- 238000000034 method Methods 0.000 title claims abstract description 34
- 238000005265 energy consumption Methods 0.000 title claims abstract description 24
- 239000010802 sludge Substances 0.000 claims abstract description 85
- 230000029087 digestion Effects 0.000 claims abstract description 33
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 20
- 238000004062 sedimentation Methods 0.000 claims abstract description 16
- 238000005842 biochemical reaction Methods 0.000 claims abstract description 7
- 238000005516 engineering process Methods 0.000 claims abstract description 6
- 238000002203 pretreatment Methods 0.000 claims abstract description 5
- 239000011259 mixed solution Substances 0.000 claims description 30
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 20
- 238000005273 aeration Methods 0.000 claims description 8
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 6
- 239000007789 gas Substances 0.000 claims description 6
- 229910052698 phosphorus Inorganic materials 0.000 claims description 6
- 239000011574 phosphorus Substances 0.000 claims description 6
- 239000012141 concentrate Substances 0.000 claims description 5
- 238000003756 stirring Methods 0.000 claims description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 4
- 230000005484 gravity Effects 0.000 claims description 3
- 238000004064 recycling Methods 0.000 claims description 3
- 230000015572 biosynthetic process Effects 0.000 claims description 2
- 229910052757 nitrogen Inorganic materials 0.000 claims description 2
- 239000006228 supernatant Substances 0.000 claims description 2
- 239000007788 liquid Substances 0.000 abstract 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 8
- 239000001301 oxygen Substances 0.000 description 8
- 229910052760 oxygen Inorganic materials 0.000 description 8
- 238000006396 nitration reaction Methods 0.000 description 5
- 230000015556 catabolic process Effects 0.000 description 4
- 238000006731 degradation reaction Methods 0.000 description 4
- 241000894006 Bacteria Species 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 239000012528 membrane Substances 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 238000010992 reflux Methods 0.000 description 2
- 239000010801 sewage sludge Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- IOVCWXUNBOPUCH-UHFFFAOYSA-M Nitrite anion Chemical compound [O-]N=O IOVCWXUNBOPUCH-UHFFFAOYSA-M 0.000 description 1
- 229920000388 Polyphosphate Polymers 0.000 description 1
- 229920000037 Polyproline Polymers 0.000 description 1
- IPQVRLSXWJPESU-UHFFFAOYSA-N [N].ON=O Chemical compound [N].ON=O IPQVRLSXWJPESU-UHFFFAOYSA-N 0.000 description 1
- MMDJDBSEMBIJBB-UHFFFAOYSA-N [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] Chemical compound [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] MMDJDBSEMBIJBB-UHFFFAOYSA-N 0.000 description 1
- 238000005352 clarification Methods 0.000 description 1
- 239000000567 combustion gas Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 239000004519 grease Substances 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 239000010842 industrial wastewater Substances 0.000 description 1
- 239000010954 inorganic particle Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 150000002823 nitrates Chemical class 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 239000001205 polyphosphate Substances 0.000 description 1
- 235000011176 polyphosphates Nutrition 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
Classifications
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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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- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention provides an urban sewage dephosphorization denitrification treatment method, relating to a sewage treatment technology. The invention discloses a high efficiency low energy consumption urban sewage dephosphorization denitrification treatment method. The treatment method includes the following steps: urban sewage after pre-treatment and digested sludge refluxed by an anaerobic sludge digestion unit enter into an anaerobic reactor, and biochemical reaction is taken place; effluent of the anaerobic reactor, mixed liquid refluxed by an aerobic reactor and returned sludge enter into an anoxic reactor, and biochemical reaction such as denitrification is taken place; one part of effluent of the anoxic reactor enters into the aerobic reactor, and the other part returns to the anaerobic reactor; mixed liquid of effluent of the aerobic reactor enters into a secondary sedimentation tank, and mud and water are separated; and residual activated sludge is concentrated and then discharged to the anaerobic sludge digestion unit to be digested. The anaerobic sludge digestion unit digests sludge under anaerobic condition, one part of digested sludge returns to the anaerobic reactor or anoxic reactor or aerobic reactor, and the other part of digested sludge is dehydrated, and then sludge treatment is carried out.
Description
Technical field
The invention belongs to a kind of sewage disposal technology, specifically relate to a kind of less energy-consumption dephosphorization denitrogenation 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
The object of the invention is to provide a kind of municipal effluent dephosphorization denitrogenation treatment process of high-efficiency low energy consumption; It is characterized in that; Comprehensive utilization through anaerobic sludge digestion and anerobic sowage, aerobe dephosphorization denitrogenation treatment technology; Efficient nitrogen and the phosphorus of removing in the sewage improves biogas output greatly, thereby through the recycling of methane gas energy the electric energy and the heat energy of sewage and sludge treatment can be provided; Specifically comprise the steps:
(1) next mixed solution b gets into anaerobic reactor through pretreated sewage with by anoxic reacter, and the digested sludge that is refluxed by anaerobic sludge digestion unit simultaneously partly or entirely gets into anaerobic reactor, and sewage and mud form mixed solution a through aeration or stirring;
(2) mixed solution a and the returned sluge by secondary sedimentation basins flow into anoxic reacter; The digested sludge that is refluxed by anaerobic sludge digestion unit simultaneously partly or entirely gets into anoxic reacter; Mixed solution d is back to anoxic reacter by aerobic reactor, and 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 gets into aerobic reactor; The effusive mixed solution d of aerobic reactor is back to anoxic reacter, and mixed solution e gets into secondary sedimentation basins;
(4) after mixed solution e gets into secondary sedimentation basins, 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 reacter, excess sludge discharge to mud upgrading unit;
(5) at the mud upgrading unit, thickened sludge is disposed to anaerobic sludge digestion unit and carries out digestion process; Supernatant is back to the sewage pre-treatment;
(6) 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; Part digested sludge all is back to anaerobic reactor or anoxic reacter or aerobic reactor; Perhaps be back to anaerobic reactor or anoxic reacter or aerobic reactor in proportion respectively, another part digested sludge is carried out sludge dewatering and disposal by national requirements.
Said step 1 is that anaerobic reactor is accepted the sewage next by the sewage pre-treatment, and mixed solution b provides biochemical reaction required active sludge; Dissolved oxygen concentration in the anaerobic reactor 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 to utilize anoxic reacter to carry out denitrification reaction.The returned sluge that is come by secondary sedimentation basins gets into anoxic reacter, and mixed solution d provides required nitrate nitrogen of anti-nitration reaction and nitrous acid nitrogen.Dissolved oxygen concentration in the anoxic reacter is controlled at and is lower than 0.5mg/L, is beneficial to the carrying out of anti-nitration reaction; Dividing plate can be set anoxic reacter is separated into different districts, and mechanical stirrer or impeller under water can be set, to strengthen the effect that mixes.
Said step 3 is the modes through 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 reaction such as nitrated; Mikrobe absorbs excessive phosphorus under aerobic situation simultaneously, thereby reduces the phosphorus content in the treat effluent.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 d of internal recycle is 100%～300%.
Said step 4 is with secondary sedimentation basins mud to be separated with sewage, and 50%～200% mud is back to anoxic reacter, and excess sludge discharge to mud upgrading unit concentrates.
Said step 5 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 unitary volume of anaerobic digestion greatly.
Said 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 the electric energy and the heat energy of sewage work's operation is provided simultaneously.
Compare with existing municipal effluent dephosphorization denitrogenation treatment process, the present invention has the following advantages:
1. the present invention adopts the method for return digestion mud to 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 the distortion of UCT (University of Cape Town) dephosphorization and denitrification process, has good dephosphorization and denitrification effect.
3. the methane gas energy that reclaims through modes such as generatings can satisfy more than 80% of required electric energy of the operation of entire sewage treatment plant, thereby is the sewage water dephosphorization denitrification treatment process of less 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 denitrogenation treatment process of high-efficiency low energy consumption of the present invention.
Embodiment
The present invention provides a kind of municipal effluent dephosphorization denitrogenation treatment process of high-efficiency low 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, the digested sludge that refluxes with sludge digestion tank then gets into 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 mixed solution b maintains about 100%, to provide biochemical reaction required active sludge.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; The recurrence rate of mixed solution d is about 200%, so that required nitrate salt of anti-nitration reaction and nitrite to be provided.The dissolved oxygen of keeping aerobic reactor is about 2mg/L, and organic biological degradation and nitration reaction carries out smoothly in the assurance sewage.The mixed solution of aerobic reactor 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 senior WWT or discharges system as treating water.In secondary sedimentation basins, 50%～150% mud is back to anoxic reacter, 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 reactor, and part digested sludge is carried out sludge disposal by national requirements after dewatering.
Table 1 has provided under the situation of 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 town sewage plant first discharge standard B.Under the situation of typical urban sewage influent quality, the present invention can provide sewage work's power consumption of 90.6% by the electric energy that methane gas reclaims, and can obtain 0.185kWh/m
3The heat energy surplus.And sludge yield of the present invention is 0.14kgVSS/kgBOD, is merely the half the of UCT treatment process (0.28kgVSS/kgBOD).
Table 1.
UCT representes University of Cape Town dephosphorization and denitrification process.
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 (7)
1. the municipal effluent dephosphorization denitrogenation treatment process of a high-efficiency low energy consumption; It is characterized in that; Comprehensive utilization through anaerobic sludge digestion and anerobic sowage, aerobe dephosphorization denitrogenation treatment technology; Efficient nitrogen and the phosphorus of removing in the sewage improves biogas output greatly, thereby through the recycling of methane gas energy the electric energy and the heat energy of sewage and sludge treatment can be provided; Specifically comprise the steps:
(1) next mixed solution b gets into anaerobic reactor through pretreated sewage with by anoxic reacter, and the digested sludge that is refluxed by anaerobic sludge digestion unit simultaneously partly or entirely gets into anaerobic reactor, and sewage and mud form mixed solution a through aeration or stirring;
(2) mixed solution a and the returned sluge by secondary sedimentation basins flow into anoxic reacter; The digested sludge that is refluxed by anaerobic sludge digestion unit simultaneously partly or entirely gets into anoxic reacter; Mixed solution d is back to anoxic reacter by aerobic reactor, and 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 gets into aerobic reactor; The effusive mixed solution d of aerobic reactor is back to anoxic reacter, and mixed solution e gets into secondary sedimentation basins;
(4) after mixed solution e gets into secondary sedimentation basins, 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 reacter, excess sludge discharge to 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 is back to the sewage pre-treatment;
(6) 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; Part digested sludge all is back to anaerobic reactor or anoxic reacter or aerobic reactor; Perhaps be back to anaerobic reactor or anoxic reacter or aerobic reactor in proportion respectively, another part digested sludge is carried out sludge dewatering and disposal by national requirements.
2. according to the municipal effluent dephosphorization denitrogenation treatment process of the said high-efficiency low energy consumption of claim 1; It is characterized in that; Said step 6 digested sludge is back to anaerobic reactor or anoxic reacter or aerobic reactor, perhaps is back to anaerobic reactor, anoxic reacter or aerobic reactor in proportion respectively.
3. according to the municipal effluent dephosphorization denitrogenation treatment process of claim 1 or 2 said high-efficiency low energy consumptions, it is characterized in that the digested sludge that said step 1 anaerobic reactor is accepted is from step 6; In anaerobic reactor, the mixed solution of sewage and mud carries out biochemical reaction under the anaerobic situation.
4. according to the municipal effluent dephosphorization denitrogenation treatment process of claim 1 or 2 said high-efficiency low energy consumptions, it is characterized in that the digested sludge that said step 2 anoxic reacter is accepted is from step 6 or step 1; In anoxic reacter, the mixed solution of sewage and mud carries out biochemical reaction under the anoxybiotic situation.
5. according to the municipal effluent dephosphorization denitrogenation treatment process of the said high-efficiency low energy consumption of claim 1, it is characterized in that the digested sludge that said step 3 aerobic reactor is accepted is from step 6 or step 2; In aerobic reactor, the mixed solution of sewage and mud carries out biochemical reaction under aerobic situation.
6. according to the municipal effluent dephosphorization denitrogenation treatment process of the said high-efficiency low energy consumption of claim 1, it is characterized in that said step 4 secondary sedimentation basins separates mud with sewage.
7. according to the municipal effluent dephosphorization denitrogenation treatment process of the said high-efficiency low energy consumption of claim 1, it is characterized in that said step 5 is to concentrate or the concentrated perhaps spissated method of air supporting of machinery 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 |
| 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 |
| CN104492128B (en) * | 2014-12-15 | 2016-02-24 | 浦华环保有限公司 | A kind of complex function preliminary sedimentation tank, system containing this preliminary sedimentation tank and application thereof |
| CN104591489A (en) * | 2015-01-07 | 2015-05-06 | 光大水务(济南)有限公司 | Sewage treatment system and sewage treatment method |
| CN106032295B (en) * | 2015-03-09 | 2019-01-29 | 北京沃尔德斯水务科技有限公司 | The intensified denitrification and dephosphorization method of complex microorganism processing high concentrated organic wastewater |
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| CN104817179B (en) * | 2015-05-17 | 2017-01-25 | 北京工业大学 | Device and method for synchronous denitrifying phosphorus removal and phosphorus recovery |
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| 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 |
| 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 |
| CN111606419B (en) * | 2020-06-01 | 2022-05-06 | 北京工业大学 | Sewage treatment system and method with self-sufficient energy |
| CN114735822A (en) * | 2022-03-15 | 2022-07-12 | 安徽世绿环保科技有限公司 | Integration AAO sewage purification equipment |
| CN115057592A (en) * | 2022-08-02 | 2022-09-16 | 四川省生态环境科学研究院 | Electrochemical phosphorus removal system and method for urban domestic wastewater |
| CN115093084B (en) * | 2022-08-05 | 2023-05-05 | 四川省生态环境科学研究院 | Multi-point multi-groove synchronous electrochemical dephosphorization system and dephosphorization method thereof |
| CN118164644A (en) * | 2024-04-25 | 2024-06-11 | 北京师范大学 | Agricultural sewage joint grid coordination purification system for CPN multi-pollutant efficient degradation |
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