CN101767876A - Anaerobic-anoxic-hypoxic integrated reactor and application thereof - Google Patents
Anaerobic-anoxic-hypoxic integrated reactor and application thereof Download PDFInfo
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Abstract
The invention relates to the field of environmental protection and sewage treatment, in particular to an anaerobic-anoxic-hypoxic integrated reactor. The anaerobic-anoxic-hypoxic integrated reactor is characterized in that: the anaerobic-anoxic-hypoxic integrated reactor comprises an anaerobic zone (3), an anoxic zone (4), a hypoxic aeration zone (5), a degasification zone (6), a sedimentation zone (7), a water inlet pipe (1), a sludge removing pipe (13) and a water outlet pipe (17); the anaerobic zone (3), the anoxic zone (4), the hypoxic aeration zone (5), the degasification zone (6) and the sedimentation zone (7) are sequentially arranged along the direction of water flow and are communicated by underwater holes; the sedimentation zone (7) is provided with the sludge removing pipe (13) and the water outlet pipe (17); as a water distribution tank (2) is provided, the proportion of sewage entering the anaerobic zone (3) and the anoxic zone (4) can be flexibly adjusted; in addition, a movable zone partition plate (20) is provided and can adjust the volume as well as functional location of the anaerobic zone (3) and the anoxic zone (4). The invention can effectively solve the problems of poor effect of synchronously removing nitrogen and phosphorus, insufficient carbon sources, high energy consumption and the like during the running of the traditional A2O reactor.
Description
Technical field
The present invention relates to environment protection, sewage treatment area, be specifically related to a kind of anaerobic-anoxic-hypoxic integrated energy-conservation reactor.
Background technology
Anaerobic-anoxic-aerobic (A
2O) reactor is widely used in the existing municipal sewage plant of China owing to advantages such as simple structure, total hrt weak point, little, the difficult generation sludge bulkings of control complicacy.But traditional A
2The O reactor exists substrate competition, mud contradiction in age, nitrogen removal rate to be difficult to some drawbacks such as raising.Technology such as short-cut nitrification and denitrification, synchronous nitration and denitrification and denitrification dephosphorization can effectively be alleviated A
2The intrinsic contradictions of O reactor.Inversion A
2O pattern (anoxic-anaerobic-aerobic) also is effective measure that address the above problem.
The ultimate principle of short-cut nitrification and denitrification biological denitrificaion is: the ammonia nitrogen in the waste water is oxidized to NO by ammonia oxidation bacteria (AOB) under aerobic condition
2 --N stops NO
2 --N continues to be oxidized to NO by NOB (NOB)
3 --N, NO then
2 --N is reduced to N by denitrifying bacterium under anoxia condition
2The superiority of short-cut nitrification and denitrification is: shortened reaction mechanism, NO
2 -The denitrification rate of-N is higher than NO
3 --N has improved denitrification rate; Shorten hydraulic detention time, reaction vessel is corresponding to be reduced; Oxygen requirement reduces 25%, and power consumption reduces; Save 37.5% denitrifying carbon source; Reduced the excess sludge discharge amount.
The synchronous nitration and denitrification biological denitrificaion is that the nitrification and denitrification process is finished in same reactor synchronously, especially under aerobic condition anti-nitration reaction can take place.General received reaction mechanism mainly is microenvironment theory and biological theory at present.According to the difference of nitrate electron acceptor(EA), can be divided into nitrate type synchronous nitration and denitrification and nitrite type synchronous nitration and denitrification again.Because the present invention is controlled at the nitrosification stage nitrated, so its reaction type is a nitrite type synchronous nitration and denitrification.The superiority of synchronous nitration and denitrification is: improve the clearance of total nitrogen, broken traditional A
2O reactor nitrogen removal rate can only be by increasing the restriction that internal reflux ratio improves; Reduced the NO in the returned sluge
x -The concentration of-N has been alleviated the competition contradiction of denitrogenation dephosphorizing to matrix.
Denitrification dephosphorization is to replace traditional aerobic/anaerobic environment with the anaerobic/anoxic alternate environment, inoculating and culturing out a class is dominant bacteria with nitrate as the denitrification phosphorus-collecting bacterium (DPB) of electron acceptor(EA), finishes the dual purpose that excessive suction phosphorus and denitrification process reach denitrogenation dephosphorizing simultaneously by their metabolism.Not only can save aeration rate when using the denitrification dephosphorizing reactor Treating Municipal Sewage, but also can reduce excess sludge production, thereby reduce investment outlay and working cost.
Inversion A
2The O pattern is exactly with traditional A
2Anaerobic zone and functional zone, oxygen-starved area bit inversion become anoxic-anaerobic-aerobic in O anaerobic-anoxic-aerobic system.Its flow process is that the sewage and the circulating sludge that enter Biochemistry Reaction System enter the oxygen-starved area together, and the nitrate in the mud carries out anti-nitration reaction under the effect of denitrifying bacteria, nitrate nitrogen is converted into nitrogen, has realized the preposition denitrogenation of system.Under different water intake modes, system water inlet all or major part directly enter the oxygen-starved area and preferentially satisfied denitrifying carbon source and require so improved the nitric efficiency of treatment system.Mud enters anaerobic zone later on through anoxic denitrification, has avoided the disadvantageous effect of nitrate to anaerobic environment.At anaerobic zone, polyP bacteria is converted into poly-β hydroxybutyric acid ergastic substances such as (PHB) with the carbon source in the sewage and gathers suction phosphorus power.At aerobic zone, organic pollutant further is degraded, and nitrifier is converted into nitrate nitrogen with the ammonia nitrogen that exists in the sewage, and the power that polyP bacteria utilization simultaneously under anaerobic produces is excessively inhaled phosphorus.Active sludge intermixture carries out mud-water separation at second pond, and a part of mud is back to system front end, and the rich phosphorated excess sludge of another part is discharged from system, thereby realizes the purpose of biological phosphate-eliminating.Inversion A
2The really effectively achievement that the O pattern has obtained in TAI HU AREA typical case urban wastewater treatment firm is proved to be a kind of sewage-treating reactor of suitable local water quality characteristics.
Summary of the invention
In order to solve traditional A
2The synchronous removal effect of nitrogen phosphorus of O reactor existence in service is not good, carbon source is not enough and the power consumption than problems such as height, the invention provides a kind of anaerobic-anoxic-hypoxemia modified form integrated A
2The O reactor, this method effectively is combined into one anaerobic zone, oxygen-starved area, aeration zone, degas zone and settling region, has saved floor space.Aspect denitrogenation, by the stable nitrite type synchronous nitration and denitrification of realizing in low-oxygen aeration district, reduced aeration rate and internal reflux ratio, reduced operation energy consumption, saved running cost.Aspect dephosphorization, with NO
x --N is that the anoxic denitrification of electron acceptor(EA) is inhaled phosphorus and with O
2For the aerobic suction phosphorus of electron acceptor(EA) exists simultaneously, improved the efficient of biological phosphate-eliminating, saved the medicament expense of chemical dephosphorization and used.
The objective of the invention is to be achieved through the following technical solutions:
A kind of anaerobic-anoxic-hypoxemia modified form integrated reactor, it is characterized in that comprising anaerobic zone, oxygen-starved area, low-oxygen aeration district, degas zone, settling region, water inlet pipe, shore pipe and rising pipe, be provided with anaerobic zone, oxygen-starved area, low-oxygen aeration district, degas zone and settling region successively by water (flow) direction, be communicated with by perforate under water; Described settling region is provided with shore pipe and rising pipe, and described anaerobic zone is provided with water inlet pipe.
Connect distribution reservoir as the described water inlet pipe of a kind of optimal way, the water distribution weir is connected with distribution reservoir, makes sewage be assigned to anaerobic zone and oxygen-starved area by the water distribution weir; Described water distribution is provided with active clapboard in the weir, and under the adjusting of active clapboard, configuration sewage enters anaerobic zone and oxygen-starved area ratio; Be provided with packaged type zone dividing plate and active clapboard draw-in groove between described anaerobic zone and the oxygen-starved area, by regulating the water inlet ratio of moveable partition board adjustment inflow anaerobic zone and oxygen-starved area; Described low-oxygen aeration district is provided with sludge reflux pump, and described degas zone is provided with reflux pump.
Be designed to ring structure as the described aeration zone 5 of a kind of optimal way, the bottom, aeration zone is provided with the disc type aeration head.
Described reactor is in the application of sewage disposal, and it utilizes the operating parameter of described reactor process to be:
Sludge loading: 0.03～0.12 (kgBOD
5/ kgMLSSd);
Volumetric loading: 0.15～0.60 (kgBOD
5/ m
3D);
Hydraulic detention time: 12 (h);
Mixed solution concentration of suspension: 3630～7630 (mg/L);
Sludge age: 8～12d;
Aeration zone DO concentration: 0.3～1.0 (mg/L).
Aforesaid a kind of anaerobic-anoxic-hypoxic integrated reactor, the position of its internal reflux point and mud backflow point is adjustable, thereby realizes the exchange of the succession of anaerobic zone and oxygen-starved area.When carbon source can't satisfy the denitrogenation dephosphorizing needs that the oxygen-starved area is preposition, thus preferentially satisfy the needs of denitrogenation, and the removal of TP then can realize by chemical dephosphorization in addition.
Aforesaid a kind of anaerobic-anoxic-hypoxic integrated reactor, the connection of its each functional zone of reaction tank are to realize that by perforate under water the mobile of water is flow by gravity, need not to promote once more.
Aforesaid a kind of anaerobic-anoxic-hypoxic integrated reactor, its flooding quantity is controlled by variable valve, and monitors its flow by magnetic flow meter.The stirring of anaerobic zone, oxygen-starved area and degas zone is finished by vertical stirrer.The bottom, aeration zone is provided with the disc type aeration head, carries out gas distribution, and gas blower carries out air feed, and air demand is regulated by blower variable frequency, and frequency transformer then is according to aeration zone DO concentration dynamic adjustments.The settling region adopts tube settling, thereby reduces its volume.
Advantage of the present invention and effect are:
(1) integrated structure: adopt integrated structure, anaerobic zone, oxygen-starved area, aeration zone, degas zone and settling region are effectively combined, saved floor space.
(2) can regulate sewage neatly and enter anaerobic zone and oxygen-starved area ratio by distribution reservoir is set; The volume and the function position of anaerobic zone and oxygen-starved area can be regulated by packaged type zone dividing plate is set in addition, thereby the flexible operation modes of various modes can be realized.
(3) nitrite type synchronous nitration denitrification denitrogenation: under the condition of low dissolved axygen, the nitrifying process major part of ammonia nitrogen is controlled at the nitrosification stage.NO wherein
2 --N carries out synchronous denitrification and produces N in the aeration zone
2And another part nitration product NO
3 --N then is back to the electron acceptor(EA) of oxygen-starved area as denitrification dephosphorization.Wherein the contribution rate to denitrogenation of synchronous nitration and denitrification is about 75%～90%.
(4) denitrification dephosphorization contribution rate height that phosphorus is removed: the removal of phosphorus has greatly and realizes that by denitrification dephosphorization its contribution rate can reach 40%～60%.
(5) the substrate competition contradiction of denitrogenation dephosphorizing is effectively solved: the realization of nitrite type synchronous nitration and denitrification and denitrification dephosphorization has been alleviated denitrification and has been released the demand contradictory of phosphorus to COD, its required C/N is lower, is applicable to the municipal sewage treatment of low ratio of carbon to ammonium.
(6) aeration zone ring structure design: the ring structure design is adopted in the aeration zone, and mixed solution can be mixed fully, has improved the capacity of resisting impact load of system.
(7) settling region mud monoblock rising phenomenon is effectively controlled: between aeration zone and settling region degas zone is set, the N that the effective elimination synchronous nitration and denitrification produces
2Thereby, eliminate the phenomenon that gas accumulation in the settling region mud carries the mud come-up, thereby improved the sedimentation effect of settling tank, guaranteed the clarity of water outlet.
(8) level of automation height: the present invention is by in each functional zone the index that online monitoring instrument in time reflects each functional zone being installed, by setting range, thus effective regulation and control of realization system operation, maintenance system operation stable, reliable.Wherein the on-line monitoring index of each functional zone has:
Anaerobic zone: ORP;
Oxygen-starved area: ORP, pH;
Low-oxygen aeration district: ORP, pH, DO.
(9) operation energy consumption is low: compare with traditional denitrification and dephosphorization method, its aeration rate and reflux ratio all significantly reduce, thereby have saved the energy consumption and the expense of operation greatly.
Description of drawings
Fig. 1 is the plot plan of the embodiment of the invention, wherein: 1, water inlet pipe; 2, distribution reservoir; 3, anaerobic zone; 4, oxygen-starved area; 5, low-oxygen aeration district; 6, degas zone; 7, settling region; 8, stirrer stand; 9, agitator; 10, active clapboard draw-in groove; 11, active clapboard; 12, cat ladder; 13, shore pipe; 14, sludge reflux pump; 15, mud valve; 16, internal reflux pump; 17, rising pipe; 18, water distribution weir; 19, disc type aeration head; 20, packaged type zone dividing plate.
Embodiment
Embodiment one: shown in accompanying drawing 1, embodiments of the invention are welded by steel plate, and are divided into anaerobic zone 3, oxygen-starved area 4, aeration zone 5, degas zone 6 and settling region 7 five parts.Wherein sewage flows into distribution reservoir 2 by water inlet pipe 1, is assigned to anaerobic zone 3 and oxygen-starved area 4 by water distribution weir 18; Wherein can adjust the water inlet ratio that flows into two districts by mobile active clapboard 11; Packaged type zone dividing plate 20 can be adjusted the volume size and the front and back order of anaerobic zone 3 and oxygen-starved area 4 according to demand, thereby can adapt to different influent quality conditions neatly; Mud is back to by sludge reflux pump 14 and flows into oxygen-starved area 4 with flowing into sewage after anaerobic zone 3 is released phosphorus; Nitrification liquid is back to through internal reflux pump 16 and passes through the aeration zone 5 of water hole inflow under water after denitrification denitrogenation and denitrifying phosphorus uptake are carried out in oxygen-starved area 4, flows into degas zone 6 then, discharges after solid-liquid separation is finished in settling region 7 at last.
Respectively the method for each reaction zone is elaborated below.
1) anaerobic zone 3: this is distinguished under the anaerobism operational conditions, amphimicrobian fermenting bacteria such as Rhodopseudomonas etc. transform into the low molecule fermentation of this class of VFAs intermediate product with biodegradable organism in the sewage, polyP bacteria can decompose the poly-phosphate of storing in its body then, the energy that is discharged can be survived in anaerobic environment for aerobic PAO, another part energy supplies the VFAs class low molecule organic matter in the PAO active absorption environment, and stores in vivo with the form of PHAs.
2) oxygen-starved area 4: this is distinguished under the anoxic operational conditions, and denitrifying bacteria utilizes the organism in the sewage to be electron donor, and the nitrate that brings with the degas zone backflow mixed liquor is electron acceptor(EA), reaches denitrogenation simultaneously and reduces organic purpose; Simultaneously, a part of PAO can be that electron donor carries out denitrification with intravital PHAs also, absorbs deliquescent phosphoric acid salt in the sewage.
3) aeration zone 5: this is distinguished under low-oxygen aeration oxygen supply operational conditions, PAO absorbs, utilizes biodegradable organic remaining in the sewage, with oxygen is the PHAs that stores in the electron acceptor(EA) continuation decomposer, thereby the dissolved phosphorus in the excess ingestion sewage, and store in vivo with the form of poly-phosphorus, reach the purpose of dephosphorization; And organism is after being utilized by polyP bacteria and denitrifying bacteria respectively through anaerobic zone, oxygen-starved area, and the concentration that arrives the aeration zone is quite low, and this helps the growth and breeding of autotrophic type ammonia oxidation bacteria and NOB.The aeration zone is under the condition of hypoxemia, and ammonia nitrogen is converted into nitrite nitrogen under the effect of ammonia oxidation bacteria, and part is carried out the denitrification removal simultaneously then, and part is converted into nitric nitrogen under the NOB effect.
4) degas zone 6: this is distinguished under stirring condition, with the N of aeration zone synchronous nitration and denitrification generation
2Separate in from the mud flco, thereby effectively eliminate the phenomenon that settling region mud floats, degas zone end bottom links to each other by small square hole with the settling region.
5) settling region 7: this district adopts tube settling, thereby reduces its volume, reduces floor space; Described tube settler is meant the settling tank that is provided with inclined tube in the settling region.The parallel pipe or the parallelpiped that utilize in the settling region are divided into a series of shallow layer precipitating layers, and processed and settled heavy mud is motion and separating mutually in each precipitation shallow-layer.Briefly be according to shallow pool theory, the treating processes of water is the same with desirable horizontal sedimentation tank, and his treatment effect is about four times of common horizontal flow basin.Have the clearance height, advantage such as the residence time is short, and floor space is little is the water treatment common equipment.
The operation scheme of reactor is diversified, can carry out reasonably optimizing according to the demand of Inlet and outlet water water quality.Main pattern comprises following several (table 1).
Embodiment two: with the first phase preliminary sedimentation tank water outlet of Wu Xilu village sewage work is process object (its water-quality guideline sees Table 2), adopts the treatment process of embodiment one, and water outlet TN is 7.14～16.33mgL
-1, average 10.59mgL
-1, clearance is 53.67%～92.19%, average removal rate is 75.63%.Water outlet NH
3-N is 0.08～7.70mgL
-1, average 2.17mgL
-1, clearance is 75.98%～99.64%, average removal rate is 94.91%.Water outlet TP is 0.22～0.60mgL
-1, average 0.39mgL
-1, clearance is 83.69%～98.46%, average removal rate is 92.90%.Water outlet COD is 12.00～53.10mgL
-1, average 34.30mgL
-1, clearance is 80.73%～94.11%, and average removal rate is 88.38%, and one-level A compliance rate is 98.45%.
First phase preliminary sedimentation tank effluent quality cartogram unit of table 2 Wu Xilu village sewage work: mgL
-1(except the pH)
Claims (7)
1. anaerobic-anoxic-hypoxic integrated sewage reactor, it is characterized in that comprising anaerobic zone (3), oxygen-starved area (4), low-oxygen aeration district (5), degas zone (6), settling region (7), water inlet pipe (1), shore pipe (13) and rising pipe (17), be provided with anaerobic zone (3), oxygen-starved area (4), low-oxygen aeration district (5), degas zone (6) and settling region (7) successively by water (flow) direction, be communicated with by perforate under water; Described settling region (7) is provided with shore pipe (13) and rising pipe (17); Described anaerobic zone (3) is provided with water inlet pipe (1).
2. reactor according to claim 1 is characterized in that also comprising distribution reservoir (2) and water distribution weir (2); Described water inlet pipe (1) connects distribution reservoir (2), and water distribution weir (18) are connected with distribution reservoir (2), make sewage be assigned to anaerobic zone (3) and oxygen-starved area (4) by water distribution weir (18).
3. according to reactor according to claim 1, it is characterized in that being provided with active clapboard (11) in the described water distribution weir (18), under the adjusting of active clapboard (11), configuration sewage enters anaerobic zone (3) and oxygen-starved area (4) ratio.
4. according to reactor according to claim 1, it is characterized in that being provided with between described anaerobic zone (3) and oxygen-starved area (4) packaged type zone dividing plate (20) and active clapboard draw-in groove (10), adjust the volume and the function position of anaerobic zone (3) and oxygen-starved area (4) by regulating moveable partition board (20).
5. according to reactor according to claim 1, it is characterized in that described low-oxygen aeration district is provided with sludge reflux pump (14), described degas zone is provided with reflux pump (16).
6. according to reactor according to claim 1, it is characterized in that described aeration zone (5) is designed to ring structure, aeration zone (5) bottom is provided with disc type aeration head (19).
7. reactor according to claim 1 is characterized in that: in the application of sewage disposal, it utilizes the operating parameter of described reactor process to be:
Sludge loading: 0.03～0.12 (kgBOD
5/ kgMLSSd);
Volumetric loading: 0.15～0.60 (kgBOD
5/ m
3D);
Hydraulic detention time: 12 (h);
Mixed solution concentration of suspension: 3630～7630 (mg/L);
Sludge age: 8～12d;
Aeration zone DO concentration: 0.3～1.0 (mg/L).
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|---|---|---|---|
| CN2010100176087A CN101767876B (en) | 2010-01-08 | 2010-01-08 | Anaerobic-anoxic-hypoxic integrated reactor and application thereof |
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| CN2010100176087A CN101767876B (en) | 2010-01-08 | 2010-01-08 | Anaerobic-anoxic-hypoxic integrated reactor and application thereof |
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| CN101767876B CN101767876B (en) | 2011-08-03 |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102557353A (en) * | 2012-02-08 | 2012-07-11 | 康群 | Two-segment aerobic-anaerobic ammonia oxidization reactor |
| CN104891656A (en) * | 2015-06-03 | 2015-09-09 | 易百皓源（北京）环保科技有限公司 | Integrated sewage treatment tank for improving AAO (Anaerobic-Anoxic-Oxic) process and sewage treatment method |
| CN106186313A (en) * | 2015-05-07 | 2016-12-07 | 易百皓源（北京）环保科技有限公司 | For improveing integrated sewage disposal pond and the sewage water treatment method of AO |
| CN106745740A (en) * | 2016-12-26 | 2017-05-31 | 上海中信水务产业有限公司 | A kind of modified form compound efficient water body processing method and system for denitrogenation dephosphorizing |
| CN107628685A (en) * | 2016-07-19 | 2018-01-26 | 樊志金 | Integrated SBR/MBBR reactors |
| CN108249570A (en) * | 2018-03-20 | 2018-07-06 | 青岛思普润水处理股份有限公司 | A kind of integrated MBBR integrated sewage treating apparatus and method |
| CN109110941A (en) * | 2018-08-16 | 2019-01-01 | 哈尔滨工业大学 | The multi-medium filtering regeneration integrated apparatus and method of secondary effluent advanced treating |
| CN111592104A (en) * | 2020-05-26 | 2020-08-28 | 昆明冶金研究院有限公司 | Short-range efficient biological treatment device and treatment method for kitchen waste digestive juice |
| CN112551828A (en) * | 2020-12-24 | 2021-03-26 | 华夏碧水环保科技有限公司 | Low-carbon-nitrogen-ratio rural domestic sewage treatment device and treatment process thereof |
| CN115465953A (en) * | 2022-10-19 | 2022-12-13 | 大连安能杰科技有限公司 | AOD biochemical reaction system for treating sewage and sewage treatment method thereof |
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2010
- 2010-01-08 CN CN2010100176087A patent/CN101767876B/en not_active Expired - Fee Related
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102557353B (en) * | 2012-02-08 | 2013-08-21 | 康群 | Two-segment aerobic-anaerobic ammonia oxidization reactor |
| CN102557353A (en) * | 2012-02-08 | 2012-07-11 | 康群 | Two-segment aerobic-anaerobic ammonia oxidization reactor |
| CN106186313A (en) * | 2015-05-07 | 2016-12-07 | 易百皓源（北京）环保科技有限公司 | For improveing integrated sewage disposal pond and the sewage water treatment method of AO |
| CN104891656A (en) * | 2015-06-03 | 2015-09-09 | 易百皓源（北京）环保科技有限公司 | Integrated sewage treatment tank for improving AAO (Anaerobic-Anoxic-Oxic) process and sewage treatment method |
| CN107628685A (en) * | 2016-07-19 | 2018-01-26 | 樊志金 | Integrated SBR/MBBR reactors |
| CN106745740B (en) * | 2016-12-26 | 2023-04-21 | 国投信开水环境投资有限公司 | Improved composite efficient water treatment method and system for denitrification and dephosphorization |
| CN106745740A (en) * | 2016-12-26 | 2017-05-31 | 上海中信水务产业有限公司 | A kind of modified form compound efficient water body processing method and system for denitrogenation dephosphorizing |
| CN108249570A (en) * | 2018-03-20 | 2018-07-06 | 青岛思普润水处理股份有限公司 | A kind of integrated MBBR integrated sewage treating apparatus and method |
| CN109110941B (en) * | 2018-08-16 | 2021-07-02 | 哈尔滨工业大学 | Multi-medium filtering and regenerating integrated device and method for secondary effluent advanced treatment |
| CN109110941A (en) * | 2018-08-16 | 2019-01-01 | 哈尔滨工业大学 | The multi-medium filtering regeneration integrated apparatus and method of secondary effluent advanced treating |
| CN111592104A (en) * | 2020-05-26 | 2020-08-28 | 昆明冶金研究院有限公司 | Short-range efficient biological treatment device and treatment method for kitchen waste digestive juice |
| CN112551828A (en) * | 2020-12-24 | 2021-03-26 | 华夏碧水环保科技有限公司 | Low-carbon-nitrogen-ratio rural domestic sewage treatment device and treatment process thereof |
| CN115465953A (en) * | 2022-10-19 | 2022-12-13 | 大连安能杰科技有限公司 | AOD biochemical reaction system for treating sewage and sewage treatment method thereof |
| CN115465953B (en) * | 2022-10-19 | 2023-09-22 | 大连安能杰科技有限公司 | AOD biochemical reaction system for treating sewage and sewage treatment method thereof |
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