CN209507897U - A kind of sewage-treatment plant of short-cut denitrification coupling Anammox - Google Patents
A kind of sewage-treatment plant of short-cut denitrification coupling Anammox Download PDFInfo
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- CN209507897U CN209507897U CN201821948806.3U CN201821948806U CN209507897U CN 209507897 U CN209507897 U CN 209507897U CN 201821948806 U CN201821948806 U CN 201821948806U CN 209507897 U CN209507897 U CN 209507897U
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- disengagement zone
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- 239000010865 sewage Substances 0.000 title claims abstract description 25
- 230000008878 coupling Effects 0.000 title claims abstract description 13
- 238000010168 coupling process Methods 0.000 title claims abstract description 13
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 13
- 238000006243 chemical reaction Methods 0.000 claims abstract description 52
- 230000003750 conditioning effect Effects 0.000 claims abstract description 25
- 239000007789 gas Substances 0.000 claims abstract description 24
- 239000000523 sample Substances 0.000 claims abstract description 24
- 239000000126 substance Substances 0.000 claims abstract description 15
- 238000010992 reflux Methods 0.000 claims abstract description 13
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 claims abstract description 12
- 238000001514 detection method Methods 0.000 claims abstract description 12
- 229910002651 NO3 Inorganic materials 0.000 claims abstract description 10
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 claims abstract description 10
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 10
- 239000001301 oxygen Substances 0.000 claims abstract description 10
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 10
- 239000002253 acid Substances 0.000 claims abstract description 5
- 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 claims abstract 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 14
- 238000010438 heat treatment Methods 0.000 claims description 14
- 239000010410 layer Substances 0.000 claims description 14
- 229910052757 nitrogen Inorganic materials 0.000 claims description 7
- 239000011229 interlayer Substances 0.000 claims description 5
- 238000004321 preservation Methods 0.000 claims description 5
- 239000003814 drug Substances 0.000 claims description 2
- 238000000926 separation method Methods 0.000 claims description 2
- 229940079593 drug Drugs 0.000 claims 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 18
- 238000000034 method Methods 0.000 description 9
- 230000008569 process Effects 0.000 description 5
- 244000005700 microbiome Species 0.000 description 4
- IOVCWXUNBOPUCH-UHFFFAOYSA-M Nitrite anion Chemical compound [O-]N=O IOVCWXUNBOPUCH-UHFFFAOYSA-M 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- JVMRPSJZNHXORP-UHFFFAOYSA-N ON=O.ON=O.ON=O.N Chemical compound ON=O.ON=O.ON=O.N JVMRPSJZNHXORP-UHFFFAOYSA-N 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 239000008187 granular material Substances 0.000 description 2
- 230000004060 metabolic process Effects 0.000 description 2
- FGIUAXJPYTZDNR-UHFFFAOYSA-N potassium nitrate Chemical compound [K+].[O-][N+]([O-])=O FGIUAXJPYTZDNR-UHFFFAOYSA-N 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- FGRBYDKOBBBPOI-UHFFFAOYSA-N 10,10-dioxo-2-[4-(N-phenylanilino)phenyl]thioxanthen-9-one Chemical compound O=C1c2ccccc2S(=O)(=O)c2ccc(cc12)-c1ccc(cc1)N(c1ccccc1)c1ccccc1 FGRBYDKOBBBPOI-UHFFFAOYSA-N 0.000 description 1
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 1
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 description 1
- 241000894006 Bacteria Species 0.000 description 1
- 241001453382 Nitrosomonadales Species 0.000 description 1
- 230000035508 accumulation Effects 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000000813 microbial effect Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000006396 nitration reaction Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
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- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
Abstract
It further includes chemicals dosing plant and PLC control module that the utility model discloses a kind of sewage-treatment plants of short-cut denitrification coupling Anammox including interconnected conditioning tank and reactor；The reactor includes Disengagement zone and reaction zone, and insulating layer is arranged with outside the reaction zone cylinder；Ammonia nitrogen and nitrate sensor and pH value detection probe are equipped in the conditioning tank, chemicals dosing plant one end is separately connected acid bath and lye pond, and the chemicals dosing plant other end connects conditioning tank；The upper and lower part of the reaction zone is equipped with refluxing opening, and the refluxing opening of reaction zone upper and lower part is connected by return pipe, and return pipe is equipped with reflux pump；Dissolved oxygen sensor and pH value detection probe are equipped in the reaction zone；Exhaust outlet is equipped at the top of the Disengagement zone, Disengagement zone is connect by exhaust outlet with gas collecting apparatus；The ammonia nitrogen, nitrate nitrogen and dissolved oxygen concentration sensor, pH value detection probe and chemicals dosing plant are connect with PLC control module respectively.
Description
Technical field
The utility model relates to a kind of sewage-treatment plants of short-cut denitrification coupling Anammox, belong to sewage treatment
Technical field.
Background technique
Anammox (Anaerobic ammonium oxidation, ANAMMOX) technique is efficient excellent because of its
Gesture has broad application prospects in wastewater biological denitrificaion field.In past 20 years, many is based on ANAMMOX reaction
Technique is able to constantly study and apply.Being found to be for Anammox realizes that heavily fortified point has been established in efficient, low consumption, the denitrogenation of sustainability
Real basis.But Anammox will have electron acceptor of enough nitrite as its reaction in application.And it is traditional
The method that nitrite is obtained by short distance nitration be only suitable for certain specific sewage, municipal sewage is then chosen in the presence of very big
War property.In fact, there is also nitrite accumulations in denitrification process.And integral anaerobic ammoxidation is one in sewage treatment
Kind new biological nitrogen removal technology, including two processes of short-cut denitrification and Anammox.Current research discovery, integral anaerobic
Ammoxidation realizes that process is more difficult, it is difficult to which controlling optimum condition makes short-cut denitrification and Anammox in same reactor
It carries out, the condition for how realizing while meeting short-cut denitrification and Anammox is studied as current integral anaerobic ammoxidation
Difficult point.
In prior art, short-cut denitrification and Anammox are all to carry out in two reaction tanks respectively, and device intelligence
Energy degree is lower, needs artificially to interfere in operation, can not be operated automatically, the manual operation of very complicated causes workload
The increase with human error is promoted, therefore one kind can automatically adjust aquatic environment according to water quality situation, to be the anti-nitre of short distance
Change and Anammox provides the integrated short-cut denitrification coupling Anammox dirt of good microbial growth and metabolism environment
The exploitation of water treatment facilities seems very necessary.
Utility model content
Purpose of utility model: the technical problem to be solved by the utility model is to provide a kind of short-cut denitrifications to couple anaerobism
The sewage-treatment plant of ammoxidation, the apparatus structure is compact, and entire short-cut denitrification, Anammox reaction are in a reactor
Interior completion, and high degree of automation.
In order to solve the above technical problems, technological means used by the utility model are as follows:
A kind of sewage-treatment plant of short-cut denitrification coupling Anammox, including interconnected conditioning tank and reaction
Device further includes chemicals dosing plant and PLC control module；The reactor includes Disengagement zone and reaction zone, outside the reaction zone cylinder
It is arranged with insulating layer；Ammonia nitrogen and nitrate sensor and pH value detection probe, chemicals dosing plant are equipped in the conditioning tank
One end is separately connected acid bath and lye pond, and the chemicals dosing plant other end connects conditioning tank；The upper and lower part of the reaction zone is equal
Equipped with refluxing opening, the refluxing opening of reaction zone upper and lower part is connected by return pipe, and return pipe is equipped with reflux pump, for flowing back
Mud mixture；Dissolved oxygen sensor and pH value detection probe are equipped in the reaction zone；The row of being additionally provided at the top of the Disengagement zone
Port, Disengagement zone are connect by exhaust outlet with gas collecting apparatus；The ammonia nitrogen, nitrate, dissolved oxygen sensor, pH value detection
Probe and chemicals dosing plant are connect with PLC control module respectively.
Wherein, the insulating layer is heat preservation water-bath interlayer, and heating temperature control means, heating temperature control dress are equipped in the insulating layer
It sets and is connect with PLC control module；Heating temperature control means include temperature sensor and heating rod, and temperature sensor and heating rod are distinguished
It is connect with PLC control module.
Wherein, the reaction zone of conditioning tank and reactor is connected by pipeline, is connected and is set on the pipeline of conditioning tank and reaction zone
There is intake pump；Reaction zone cylinder is equipped with multiple sample taps, and sample tap is interior inserted with probe tube, and probe tube is protruded into across insulating layer
Tank interior；There is spaced probe tube to pass through insulating layer on reaction zone cylinder and protrudes into tank interior.
Wherein, the Disengagement zone is located at the top of reaction zone, is equipped with annular collecting tank outside Disengagement zone, on the side wall of Disengagement zone
Equipped with overflow port, annular collecting tank is for collecting the water that overflow port ejects；It is collection chamber at the top of Disengagement zone, is equipped in Disengagement zone
Three phase separator, three phase separator bottom end are fixed on the side wall of Disengagement zone, and three phase separator top is passed through in collection chamber.
Wherein, the collection chamber bottom surface is equipped with U-shaped exhaust pipe, and U-shaped exhaust pipe is used to collect the gas of settling zone generation；Collection
The lower end side of gas chamber is equipped with tap, the mud granule carried out for gas to be discharged；Gas vent, row are equipped at the top of collection chamber
Stomata is connect by exhaust pipe with external gas collecting apparatus, and the gas of collection chamber is expelled to external gas collecting apparatus by gas vent.
Wherein, the exhaust pipe is equipped with shut-off valve and nitrogen stream meter.
Compared with the prior art, technical solutions of the utility model have the beneficial effect that
The entire short-cut denitrification of utility model device, Anammox reaction are completed in the same reactor, whole
A apparatus structure is compact, integration and high degree of automation, easy to operate；Utility model device can be according to water quality feelings simultaneously
Condition automatically adjusts aquatic environment, thus for short-cut denitrification in reactor and Anammox provide the growth of good microorganism with
Metabolism environment.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the utility model sewage-treatment plant；
Fig. 2 is the structural schematic diagram of the utility model sewage-treatment plant reaction zone；
Fig. 3 is the structural schematic diagram of the utility model sewage-treatment plant Disengagement zone；
Fig. 4 is the top view of the utility model sewage-treatment plant Disengagement zone.
Specific embodiment
The technical solution of the utility model is described further below in conjunction with the drawings and specific embodiments.
As shown in figures 1-4, the sewage-treatment plant of the utility model short-cut denitrification coupling Anammox, including phase
Intercommunicated conditioning tank 6 and reactor 11, further includes chemicals dosing plant 9 and PLC control module 20；Reactor 11 includes Disengagement zone
11-1 and reaction zone 11-3, Disengagement zone 11-1 and reaction zone 11-3 are detachably connected by flange；Reaction zone 11-3 cylinder housing
Equipped with insulating layer 11-4；Ammonia nitrogen and nitrate sensor 7 and pH value detection probe 9-1, dosing dress are equipped in conditioning tank 6
It sets 9 one end and is separately connected acid bath 9-2 and lye pond 9-3,9 other end of chemicals dosing plant connects conditioning tank 6；Reaction zone 11-3's is upper
Portion and lower part are equipped with refluxing opening 21, and the refluxing opening 26 of the upper and lower part reaction zone 11-3 is connected by return pipe 20, return pipe
21 are equipped with reflux pump 14, and return pipe 21 is for the mud mixture that flows back；13 He of dissolved oxygen sensor is equipped in reaction zone 11-3
PH value detection probe；Exhaust outlet is additionally provided at the top of the 11-1 of Disengagement zone, Disengagement zone 11-1 is connect by exhaust outlet with gas collecting apparatus 18；
Ammonia nitrogen and nitrate sensor 7, pH value detection probe 9-1, dissolved oxygen sensor 13 and chemicals dosing plant 9 are controlled with PLC respectively
Molding block 20 connects.
Wherein, insulating layer 11-4 is heat preservation water-bath interlayer, is equipped with heating temperature control means 12 in insulating layer 11-4, heats temperature control
Device 12 is connect with PLC control module 20；Heating temperature control means 12 include temperature sensor and heating rod, temperature sensor and plus
Hot pin is connect with PLC control module 20 respectively, and heating temperature control means 12 are for the heating and heat preservation to reaction zone cylinder.
Wherein, conditioning tank 6 is connect with the reaction zone 11-3 of reactor 11 by pipeline, connects conditioning tank 6 and reaction zone 11-
3 pipeline is equipped with intake pump 10；Reaction zone 11-3 cylinder is equipped with multiple sample taps 22, and sample tap 22 is interior inserted with sampling
Pipe, probe tube pass through insulating layer 11-4 and protrude into reaction zone 11-3 inner barrel；There is spaced sampling on reaction zone cylinder
Pipe protrudes into tank interior across insulating layer 11-4.
Wherein, Disengagement zone 11-1 is located at the top of reaction zone 11-3, and annular collecting tank 11-2 is equipped with outside the 11-1 of Disengagement zone,
Disengagement zone 11-1 side wall is equipped with overflow port 24, and annular collecting tank 11-2 is for collecting the water that overflow port 24 ejects；Disengagement zone
It is collection chamber 25 at the top of 11-1, is equipped with three phase separator 23 in the 11-1 of Disengagement zone, 23 bottom end of three phase separator is fixed on Disengagement zone
On 11-1 side wall, 23 top of three phase separator is passed through in collection chamber 25；25 bottom surface of collection chamber is equipped with U-shaped exhaust pipe 26, U-shaped exhaust
Pipe 26 is used to collect the gas of 23 settling zone of three phase separator generation；The lower end side of collection chamber 25 is equipped with tap 28, discharge
Hole 28 is for being discharged the mud granule that gas carries out；Gas vent 27 is equipped at the top of collection chamber 25, gas vent 27 passes through exhaust pipe
19 connect with external gas collecting apparatus 18, and the gas of collection chamber 25 is expelled to external gas collecting apparatus 18 by gas vent 27.Exhaust pipe 19
It is equipped with shut-off valve 16 and nitrogen stream meter 17.
Sewage plant inflow and outflow enters conditioning tank 6 by two-way water inlet pipe, is equipped with motorized adjustment on two-way water inlet pipe
Valve 1 (2) and flowmeter 3 (4), two-way water inlet pipe are connect by tee tube 5 with conditioning tank 6.Sewage plant Inlet and outlet water is respectively through electronic
Regulating valve and tee tube 5 are connected to 6 top of conditioning tank, and electric control valve 1 and electric control valve 2 are used to control the stream of water-in and water-out
Amount, flowmeter 3 and flowmeter 4 are used for real-time display Inlet and outlet water uninterrupted.Conditioning tank 6 is adjusted having a size of φ 350mm × 200mm
It saves and is equipped with ammonia nitrogen, nitrate sensor 7 in pond 6, ammonia nitrogen, nitrate sensor 7 are for detecting NH4 +And NO3 -Concentration
And connect with PLC control module 20, the aperture of Inlet and outlet water valve 1 and 1 is adjusted according to set proportion, makes the NH in conditioning tank 64 +
And NO3 -Stablize in the range of setting, the pH value probe 9-1 in conditioning tank 6 detects liquid pH value higher or lower than set
Range when, pH automatic medicine adding apparatus 9 by lye add pump 9-2 or acid solution add pump 9-3 open, until conditioning tank 6 in pH value
It is down to setting range；It is equipped with blender 8 at the top of conditioning tank 6, keeps each material mixing in entire adjustment process uniform.6 bottom of conditioning tank
Sewage is pumped into reactor 11 by intake pump 10 by portion, and 11 dischargeable capacity of reactor is 13L, and reactor 11 includes Disengagement zone 11-1
With reaction zone 11-3, reaction zone 11-3 is having a size of upper bottom surface φ 150mm × bottom surface φ 120mm × high 900mm.Reactor 11 is total
High 1550mm.There is heat preservation water-bath interlayer 11-4 outside reaction zone 11-3, keeps the temperature and be equipped with heating temperature control means in water-bath interlayer 11-4
There are pH, dissolved oxygen sensor 13 inside 12, reaction zone 11-3, dissolved oxygen sensor 13 is for detecting microorganism in reaction zone 11-3
The environment of growth.Reaction zone 11-3 is upper, and treated that water is pumped into the bottom reaction zone 11-3 by reflux pump 14 is sufficiently mixed with water inlet
After further participate in reaction process, while play disturbance reaction zone 11-3 in mud mixture, be allowed to uniformly mixed.Reactor 11
Top is Disengagement zone 11-1, and three phase separator 23 is equipped in the 11-1 of Disengagement zone, and three phase separator 23 is used for mud-water separation.Reactor
11 water outlets are discharged into collecting tank 11-2, there is sensor 15 in collecting tank 11-2, and sensor 15 includes ammonia nitrogen sensor 15-1, nitre state
Nitrogen sensor 15-2, the ammonia nitrogen sensor 15-1 in nitrite nitrogen sensor 15-3, COD sensor 15-4, collecting tank 11-2, nitre
State nitrogen sensor 15-2, nitrite nitrogen sensor 15-3, COD sensor 15-4 are connect with PLC control module 20, collecting tank
Sensor in 11-2 is used to detect the water quality indicator of discharge water.Exhaust pipe 19 is equipped at the top of reactor 11, exhaust pipe 19 connects
Two-bit triplet shut-off valve 16 and nitrogen stream meter 17, gas are passed through gas collecting apparatus 18, collect when needing, directly arranges when not needing
It puts, facilitates and carry out analysis measurement, all sensors, valve, heating temperature control means 12, chemicals dosing plant in utility model device
9, flowmeter is connect with PLC control module 20, and PLC control module 20 has included wireless communication module, and PLC control module 20 is logical
It crosses wireless communication module to connect with Cloud Server, to realize controlling terminal to the long-range control of whole process and auto-control.
Utility model device is directed to the characteristic of anaerobic ammonia oxidizing bacteria and short-cut denitrification bacterium, can automatically adjust reduction water
The stable environment for being suitable for functional microorganism growth and being metabolized is created in the impact of matter situation and service condition to microorganism, to maintain
Short-cut denitrification couples the efficient stable operation of Anammox sewage-treatment plant.
Claims (6)
1. a kind of sewage-treatment plant of short-cut denitrification coupling Anammox, it is characterised in that: including interconnected tune
Pond and reactor are saved, further includes chemicals dosing plant and PLC control module；The reactor includes Disengagement zone and reaction zone, described anti-
It answers and is arranged with insulating layer outside area's cylinder；It is equipped with ammonia nitrogen and nitrate sensor in the conditioning tank and pH value detection is visited
Head, chemicals dosing plant one end are separately connected acid bath and lye pond, and the chemicals dosing plant other end connects conditioning tank；The reaction zone it is upper
Portion and lower part are equipped with refluxing opening, and the refluxing opening of reaction zone upper and lower part is connected by return pipe, and return pipe is equipped with reflux
Pump；Dissolved oxygen sensor and pH value detection probe are equipped in the reaction zone；Exhaust outlet, Disengagement zone are equipped at the top of the Disengagement zone
It is connect by exhaust outlet with gas collecting apparatus；The ammonia nitrogen, nitrate nitrogen and dissolved oxygen concentration sensor, pH value detection probe and add
Medicine device is connect with PLC control module respectively.
2. the sewage-treatment plant of short-cut denitrification coupling Anammox according to claim 1, it is characterised in that: institute
Insulating layer is stated as heat preservation water-bath interlayer, is equipped with heating temperature control means, heating temperature control means and PLC control module in the insulating layer
Connection.
3. the sewage-treatment plant of short-cut denitrification coupling Anammox according to claim 1, it is characterised in that: adjust
The reaction zone for saving pond and reactor is connected by pipeline, and the pipeline for connecting conditioning tank and reaction zone is equipped with intake pump；Reaction zone
Cylinder is equipped with multiple sample taps, and sample tap is interior inserted with probe tube, and probe tube passes through insulating layer and protrudes into tank interior.
4. the sewage-treatment plant of short-cut denitrification coupling Anammox according to claim 1, it is characterised in that: institute
The top that Disengagement zone is located at reaction zone is stated, annular collecting tank is equipped with outside Disengagement zone, Disengagement zone side wall is equipped with overflow port；Separation
It is collection chamber at the top of area, is equipped with three phase separator in Disengagement zone, three phase separator bottom end is fixed on the side wall of Disengagement zone, three-phase separate
It is passed through in collection chamber from device top.
5. the sewage-treatment plant of short-cut denitrification coupling Anammox according to claim 4, it is characterised in that: institute
Collection chamber bottom surface is stated equipped with U-shaped exhaust pipe, the lower end side of collection chamber is equipped with tap, and gas vent, row are equipped at the top of collection chamber
Stomata is connect by exhaust pipe with external gas collecting apparatus.
6. the sewage-treatment plant of short-cut denitrification coupling Anammox according to claim 5, it is characterised in that: institute
Exhaust pipe is stated equipped with shut-off valve and nitrogen stream meter.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821948806.3U CN209507897U (en) | 2018-11-23 | 2018-11-23 | A kind of sewage-treatment plant of short-cut denitrification coupling Anammox |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201821948806.3U CN209507897U (en) | 2018-11-23 | 2018-11-23 | A kind of sewage-treatment plant of short-cut denitrification coupling Anammox |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111661925A (en) * | 2020-07-14 | 2020-09-15 | 北京城市排水集团有限责任公司 | Enhanced denitrification system and method for treating low C/N urban sewage continuous flow |
-
2018
- 2018-11-23 CN CN201821948806.3U patent/CN209507897U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111661925A (en) * | 2020-07-14 | 2020-09-15 | 北京城市排水集团有限责任公司 | Enhanced denitrification system and method for treating low C/N urban sewage continuous flow |
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