CN103058372B - Down-flow integrated nitrification and denitrification aeration biological filtering device and method - Google Patents
Down-flow integrated nitrification and denitrification aeration biological filtering device and method Download PDFInfo
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- CN103058372B CN103058372B CN201310000519.5A CN201310000519A CN103058372B CN 103058372 B CN103058372 B CN 103058372B CN 201310000519 A CN201310000519 A CN 201310000519A CN 103058372 B CN103058372 B CN 103058372B
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Abstract
The invention discloses a device and a method for treating nitrogen-containing waste sewage by using a down-flow integrated nitrification and denitrification aeration biological filtering device in the technical field of sewage treatment. The invention provides a novel biological filtering device for efficiently removing nitrogen, wherein a gas-water separating device is arranged at the middle of a biological filtering pond and is used for dividing the biological filtering pond into a nitrification zone and a denitrification zone. The invention also provides a method for efficiently removing nitrogen. According to the down-flow operation mode, the nitrogen-containing sewage and wastewater and the reflowed nitrifying liquid are simultaneously pumped into a denitrifying zone and nitrate nitrogen is reduced into nitrogen gas by using a carbon source in water; water subjected to nitrogen removal is nitrified in the nitrifying zone; ammonia nitrogen in water is oxidized into nitrate nitrogen; and mostly effluent in the filtering pond is reflowed to the denitrifying zone and provides an electron acceptor for the denitrifying zone, thereby efficiently removing organic matters, nitrogen and suspended matters in the nitrogen-containing waste sewage. According to the device and the method disclosed by the invention, efficient nitrogen removal of the nitrogen-containing sewage and wastewater is realized in the same biological filtering pond; high quality of effluent and long back flush period are obtained; energy consumption is low; and the occupied area is effectively saved.
Description
Technical field
The invention belongs to technical field of sewage, relate generally to apparatus and method from utilization to stream integral type nitration denitrification biological filter that process nitrogenous dirty waste water under.
Background technology
Biological aerated filter process is a kind of microbial film sewage disposal technology that integrates biochemical degradation and filtering function.Have high volumetric loading, aerobic and anoxic microorganism coexists, resistance to overload shock is strong, need not sludge reflux and the advantage such as treatment facility compactness, can be widely used in the processing of the high-concentration waste waters such as the dirty waste water advanced processing in city and reuse, community life sewage processing and reuse, trade effluent.
BAF can be divided into upflow type aerating biological filter and lower to stream BAF by flowing to difference.
To stream BAF pollutent in operational process, be mainly trapped in top, filter tank down, head loss is little, and backwash operation is easy, but treatment effect is unstable, and effluent quality difficulty is up to standard;
The shortcomings such as tradition upflow type aerating biological filter is had relatively high expectations to water inlet SS, and easily obstruction is even hardened, and exists backwash operation complicated, and short and energy consumption of recoil cycle is high;
Shortcoming for traditional BAF, there is investigator to improve traditional biological filter tank, by anoxic, aerobic being integrated in one, form nitration denitrification integrative biological filter, yet this novel all-in-one filter tank ubiquity backwash operation complexity and energy consumption are high, the difficult problem such as up to standard of water outlet SS.
Summary of the invention
The present invention is directed to the existing variety of issue of current biological aerated filter process, in conjunction with the up to standard and energy-saving and cost-reducing requirement of effluent quality, under proposition to stream integral type nitration denitrification aeration biological filtering device and method.Under novel reactor adopts, to stream operation scheme, the middle water layer in biological filter arranges gas and water separator, and biological filter is divided into two sections.Epimere is denitrification filtrating area, can effectively utilize the carbon source in nitrogenous dirty waste water to carry out denitrification, and hold back certain suspended substance; Bottom is nitrification zone, realizes the separated of nitrification zone and denitrification zone, and realizes the optimization of backwash operation, finally reaches efficient denitrification and energy-saving and cost-reducing object.
Lower to stream integral type nitration denitrification aeration biological filtering device, this equipment energy characteristic is: raw water box 1 is connected with pond, biological aerated filter pond body through intake pump 2, body order from top to bottom in BAF pond is denitrification filtrating area 3, the second supporting layer 4, middle water layer 5, nitrification zone 6, the first supporting layer 7, effluent of aeration biological filter pipe 8 with go out water tank 9 and be connected, go out water tank 9 and be connected with the denitrification filtrating area 3 of BAF through nitrification liquid reflux pump 11.
The denitrification filtrating area 3 of described BAF is 1:1～1:1.5 with the volume ratio of nitrification zone 6.Denitrification filtrating area 3 filtrate used is lightweight suspension filtrate, and proportion is between 0.6～0.7g/cm
3between, voidage is 90 ~ 95%, and packing ratio is 60 ~ 70%, and 3 tops, denitrification filtrating area arrange filtrate interception screen cloth 21; The selected filtrate proportion in nitrification zone 6 is between 1.3 ~ 1.9g/cm
3between, voidage is 25% ~ 35%; Middle water layer 5 is without filtrate, and it is highly 35～50% of nitrification zone 6 height. ?
Described gas blower 12 is connected with the first supporting layer 7 of BAF by gas meter 14 and aeration pipeline 13; The funnel-form of described gas and water separator 15 is collected mouth and is arranged on middle water layer 5, and gas and water separator 15 is through denitrification filtrating area 3.
Described BAF bottom arranges the first back flushing water inlet pipe 17, and middle water layer 5 arranges the second back flushing water inlet pipe 18; In the middle of described, water layer 5 arranges the first back flushing water shoot 19, and BAF top arranges the second back flushing water shoot 20; Described aeration pipeline 13 is connected with the first supporting layer 7 of BAF, as the gas washing pipe line of BAF back flushing; Describedly go out water tank 9 and be connected with the first back flushing water inlet pipe 17 and the second back flushing water inlet pipe 18 through back flushing intake pump 16, the inlet chest during as back flushing.
BAF middle part arranges gas and water separator, and pond body is divided into nitrification zone and denitrification filtrating area, realizes the separated of heterotrophic bacterium and autotrophic bacteria; Realize the good combination of nitration denitrification, improve nitric efficiency;
Hold back the larger light filler of denitrification filtrating area filling pore rate of a large amount of levitated objects, the less filler of proportion larger porosity is filled in nitrification zone, when guaranteeing the interception capacity that filtrate is good, efficiently solves again the susceptible to plugging difficult problem in filter tank.
The present invention also provides the method for utilizing said apparatus to carry out dirty waste water advanced denitrogenation, comprises the following steps:
1. nitrogenous dirty waste water is flowed into the denitrification filtrating area 3 of BAF through intake pump 2 by raw water box 1, what pump into also has from the nitrification liquid that goes out water tank 9 simultaneously, flooding velocity and nitrification liquid flow are controlled by intake pump 2 and nitrification liquid reflux pump 11 respectively, and throughput ratio is 1:3 ~ 1:3.5; Nitrogenous dirty waste water and the nitrification liquid denitrification filtrating area 3 of flowing through from top to bottom, it is nitrogen by nitrate-nitrogen reduction that denitrifying bacterium in denitrification filtrating area 3 utilizes the organic carbon source in sewage, hydraulic detention time is 30 ~ 60min, and dissolved oxygen concentration maintains 0.3 ~ 0.5mg/l.
2. removed most of organic nitrogenous dirty waste water from above-mentioned denitrification filtrating area 3 successively by the second supporting layer 4 and middle water layer 5, enter nitrification zone 6, the nitrobacteria of nitrification zone enrichment is oxidized to nitric nitrogen by the ammonia nitrogen in former water, hydraulic detention time is 20 ~ 50min, and nitrification zone keeps dissolved oxygen concentration at 1.0 ~ 3.0mg/L.
3. the water after nitrated enters water outlet water tank 9 after by the first supporting layer 7, regulates the valve on filter tank rising pipe 8 to make water outlet flow into out water tank 9 with 400 ~ 450% of flooding velocity.
4. go out water in water tank 9 and through nitrification liquid reflux pump 11, be back to denitrification filtrating area 3 with 300～350% nitrate recirculation ratio, rest part is through water shoot 10 discharges.
5. gas blower 12 carries out aeration by 13 pairs of BAF of aeration pipeline, and aeration pipeline is arranged on the first supporting layer 7, and gas and flow direction are contrary, and gas-water ratio is 3 ~ 8.
6. gas stream after 5, is discharged in air by gas-liquid separator 15 when middle water layer, thereby guarantees the anaerobic environment of denitrification zone 5.In described BAF operational process, when in the middle of recording, the SS of water layer 5 is greater than 15mg/L, back flushing is carried out in denitrification filtrating area 3, close intake pump 2, nitrification liquid reflux pump 11 and filter tank rising pipe 8, open back flushing intake pump 16, the second backwash tube 18, backwashing water enters the second supporting layer 4 through the second backwash tube 18, and back flushing is carried out in denitrification filtrating area 3, contains a large amount of suspended substances and discharges by the second back flushing water shoot 20 with the biomembranous water that comes off.In BAF operational process, when biological filter, water outlet SS in bottom is greater than 10mg/L, NH
4 +-N is greater than 5mg/L, simultaneously BAF gross head loss be greater than nitrification zone packed height 60% time, to lower, to stream nitration denitrification integral type BAF, carry out back flushing, the gas of gas blower 12 is by aeration pipeline 13, backwashing water is through the first back flushing water inlet pipe 17, enter the first supporting layer 7, back flushing water outlet is first discharged through the first back flushing water shoot 19, then through the second back flushing water discharge line 20 discharges.
The invention has the beneficial effects as follows:
In same biological filter, realize the efficient denitrification of sanitary sewage, form integration apparatus, improve the utilization ratio of reactor, effectively saved floor space;
Nitrogenous dirty waste water first passes through denitrification filtrating area, utilizes the nitric nitrogen that in water, COD degraded refluxes, and COD utilization ratio is high, is conducive to solve the problem of ubiquitous carbon source deficiency in sewage disposal;
Nitrogenous dirty waste water first passes through denitrification filtrating area, tackles a large amount of suspended matters, makes SS mainly concentrate on top, biological filter; Denitrification filtrating area light filling filler, porosity is high, and water environment capacity is strong; Nitrification zone packing ratio is great in the filler of water, porosity, has the effect of suspended matter in further trap water in nitrated; The combination of the two kinds of filtrates in denitrification zone and nitrification zone when guaranteeing that water outlet SS is up to standard, has solved the susceptible to plugging difficult problem of traditional biological aerated filter process simultaneously;
The lower operation scheme to stream makes suspended matter mainly be trapped in top, biological filter, thus only need often back flushing to be carried out in filter tank, the cycle stretch-out of whole filter back washing, energy consumption is low and backwash effect good.
Accompanying drawing explanation
Fig. 1 is to stream nitration denitrification integral type BAF aeration biological filter device structural representation under the present invention;
The former pond of 1-; 2-intake pump; 3-denitrification filtrating area; 4-the second supporting layer; Water layer in the middle of 5-; 6-nitrification zone; 7-the first supporting layer; 8-filter tank rising pipe; 9-goes out water tank; 10-water shoot; 11-nitrification liquid reflux pump; 12-gas blower; 13-aeration pipeline; 14-gas meter; 15-gas and water separator; 16-back flushing intake pump; 17-the first back flushing water inlet pipe; 18-the second back flushing water inlet pipe; 19-the first back flushing water shoot; 20-the second back flushing water shoot; 21-filtrate interception screen cloth.
Embodiment
Lower to stream integral type nitration denitrification aeration biological filtering device shown in accompanying drawing 1, raw water box 1 is connected with BAF through intake pump 2, body order from top to bottom in BAF pond is denitrification filtrating area 3, the second supporting layer 4, middle water layer 5, nitrification zone 6, the first supporting layer 7, effluent of aeration biological filter pipe 8 flows into out water tank 9, goes out water tank 9 and is connected with the denitrification filtrating area 3 of BAF through nitrification liquid reflux pump 11.
The denitrification filtrating area 3 of described BAF is 1:1 with the volume ratio of nitrification zone 6.Denitrification filtrating area 3 filtrate used is lightweight suspension filtrate, and proportion is between 0.6～0.7g/cm
3between, voidage is 90 ~ 95%, and packing ratio is 65%, and 3 tops, denitrification filtrating area arrange filtrate interception screen cloth 21; The selected filtrate proportion in nitrification zone 6 is between 1.3 ~ 1.9g/cm
3between, voidage is 25% ~ 35%; Middle water layer 5 is without filtrate, and it is highly 40% of nitrification zone 6 height.
Described gas blower 12 is connected with the first supporting layer 7 of BAF by gas meter 14 and aeration pipeline 13; The funnel-form of described gas and water separator 15 is collected mouth and is arranged on middle water layer 5, and gas and water separator 15 is through denitrification filtrating area 3.
Described BAF bottom arranges the first back flushing water inlet pipe 17, and middle water layer 5 arranges the second back flushing water inlet pipe 18; In the middle of described, water layer 5 arranges the first back flushing water shoot 19, and BAF top arranges the second back flushing water shoot 20; Described aeration pipeline 13 is connected with the first supporting layer 7 of BAF, as the gas washing pipe line of BAF back flushing; Describedly go out water tank 9 and be connected with the first back flushing water inlet pipe 17 and the second back flushing water inlet pipe 18 through back flushing intake pump 16, the inlet chest during as back flushing.
BAF middle part arranges gas and water separator, and pond body is divided into nitrification zone and denitrification filtrating area, realizes the separated of heterotrophic bacterium and autotrophic bacteria; Realize the good combination of nitration denitrification, improve nitric efficiency;
The larger light filler of denitrification zone filling pore rate, water environment capacity is strong, and nitrogenous dirty waste water is first held back a large amount of levitated objects through top, ，Shi biological filter, denitrification zone, and backwash mode is easy and backwash effect good; The less filler of proportion larger porosity is filled in nitrification zone, further tackles the SS in dirty waste water, and whole system, when guaranteeing the interception capacity that filtrate is good, efficiently solves again the susceptible to plugging difficult problem in filter tank.
The present invention also provides the method for utilizing said apparatus to carry out efficient domestic sewage denitrogenation, comprises the following steps:
1) nitrogenous dirty waste water is flowed into the denitrification filtrating area 3 of BAF through intake pump 2 by raw water box 1, what pump into also has from the nitrification liquid that goes out water tank 9 simultaneously, flooding velocity and nitrification liquid flow are controlled by intake pump 2 and nitrification liquid reflux pump 11 respectively, and throughput ratio is 1:3; Nitrogenous dirty waste water and the nitrification liquid denitrification filtrating area 3 of flowing through from top to bottom, it is nitrogen by nitrate-nitrogen reduction that the denitrifying bacterium in anoxic filtrating area 3 utilizes the organic carbon source in sewage, and hydraulic detention time is 30min, and dissolved oxygen concentration maintains 0.3 ~ 0.5mg/l.
2) removed most of organic nitrogenous dirty waste water from above-mentioned denitrification filtrating area 3 successively by the second supporting layer 4 and middle water layer 5, enter nitrification zone 6, the nitrobacteria of nitrification zone enrichment is oxidized to nitric nitrogen by the ammonia nitrogen in former water, and hydraulic detention time is 30min.Nitrification zone keeps dissolved oxygen concentration at 2mg/L.
3) water after nitrated enters water outlet water tank 9 after by the first supporting layer 7, regulates the valve on filter tank rising pipe 8 to make water outlet flow into out water tank 9 with 400% of flooding velocity
4) go out water in water tank 9 and through nitrification liquid reflux pump 11, be back to denitrification filtrating area 3 with 300% nitrate recirculation ratio, rest part is through water shoot 10 discharges.
5) gas blower 12 carries out aeration by 13 pairs of BAF of aeration pipeline, and aeration pipeline is arranged on the first supporting layer 7, and gas and flow direction are contrary, and gas-water ratio is 4:1, and the nitrifier being attached on 6 fillers of nitrification zone is oxidized to nitric nitrogen by ammonia nitrogen.
6) gas stream after 5, is discharged in air by gas-liquid separator 15 when middle water layer, thereby guarantees the anaerobic environment of denitrification filtrating area 3.
7) in described BAF operational process, when in the middle of recording, the SS of water layer 5 is greater than 15mg/L, back flushing is carried out in denitrification filtrating area 3, close intake pump 2, nitrification liquid reflux pump 11 and filter tank rising pipe 8, open back flushing intake pump 16 and the second backwash tube 18, and backwashing water enters the second supporting layer 4 through the second backwash tube 18, back flushing is carried out in denitrification filtrating area 3, contain a large amount of suspended substances and discharge by the second back flushing water shoot 20 with the biomembranous water that comes off.
8), in BAF operational process, when BAF bottom water outlet, SS is greater than 10mg/L, NH
4 +-N is greater than 5mg/L, simultaneously biological filter gross head loss be greater than nitrification zone packed height 60% time, to lower, to stream nitration denitrification integral type filter tank, carry out back flushing, the gas of gas blower 12 is by aeration pipeline 13, backwashing water is through the first back flushing water inlet pipe 17, enter the first supporting layer 7, back flushing water outlet is first discharged through the first back flushing water shoot 19, then through the second back flushing water discharge line 20 discharges.
9) in backwash process, filtrate interception screen cloth 21 protection filtrates are not rushed out pond body when large back washing strength.
In same biological filter, realize the efficient denitrification of sanitary sewage, form integration apparatus, improve the utilization ratio of reactor, effectively saved floor space;
Nitrogenous dirty waste water first passes through denitrification filtrating area, utilizes the nitric nitrogen that in water, COD degraded refluxes, and COD utilization ratio is high, is conducive to solve the problem of ubiquitous carbon source deficiency in sewage disposal;
Nitrogenous dirty waste water first passes through denitrification filtrating area, tackles a large amount of suspended matters, makes SS mainly concentrate on top, biological filter; Denitrification filtrating area light filling filler, porosity is high, and water environment capacity is strong; Nitrification zone packing ratio is great in the filler of water, porosity, has the effect of suspended matter in further trap water in nitrated; The combination of the two kinds of filtrates in denitrification zone and nitrification zone when guaranteeing that water outlet SS is up to standard, has solved the susceptible to plugging difficult problem of traditional biological aerated filter process simultaneously;
The lower operation scheme to stream makes suspended matter mainly be trapped in top, biological filter, thus only need often back flushing to be carried out in filter tank, the cycle stretch-out of whole filter back washing, energy consumption is low and backwash effect good.
Claims (2)
1. time to stream integral type nitration denitrification aeration biological filtering device, its characteristic is: raw water box (1) is connected with BAF pond body through intake pump (2), body order from top to bottom in BAF pond is denitrification filtrating area (3), the second supporting layer (4), middle water layer (5), nitrification zone (6), the first supporting layer (7), effluent of aeration biological filter pipe (8) with go out water tank (9) and be connected, go out water tank (9) and be connected with the denitrification filtrating area (3) of BAF through nitrification liquid reflux pump (11);
The denitrification filtrating area (3) of described BAF is 1:1～1:1.5 with the volume ratio of nitrification zone (6); Denitrification filtrating area (3) filtrate used is lightweight suspension filtrate, and proportion is between 0.6～0.7g/cm
3between, voidage is 90～95%, and packing ratio is 60～70%, and top, denitrification filtrating area (3) arranges filtrate interception screen cloth (21); The selected filtrate proportion in nitrification zone (6) is between 1.3～1.9g/cm
3between, voidage is 25%～35%; Middle water layer (5) is without filtrate, and it is highly 35～50% of nitrification zone (6) height;
Gas blower (12) is connected with first supporting layer (7) of BAF by gas meter (14) and aeration pipeline (13); The funnel-form of gas and water separator (15) is collected mouth and is arranged on middle water layer (5), and gas and water separator (15) is through denitrification filtrating area (3);
Described BAF bottom arranges the first back flushing water inlet pipe (17), and middle water layer (5) arranges the second back flushing water inlet pipe (18); In the middle of described, water layer (5) arranges the first back flushing water shoot (19), and BAF top arranges the second back flushing water shoot (20); Described aeration pipeline (13) is as the gas washing pipe line of BAF back flushing; Describedly go out water tank (9) and be connected with the first back flushing water inlet pipe (17) and the second back flushing water inlet pipe (18) by back flushing intake pump (16), the inlet chest during as back flushing.
2. application rights requires the lower method from nitrogenous dirty waste water to stream integral type nitration denitrification aeration biological filtering device that process described in 1, it is characterized in that:
1) nitrogenous dirty waste water is flowed into the denitrification filtrating area (3) of BAF through intake pump (2) by raw water box (1), what pump into also has from the nitrification liquid that goes out water tank (9) simultaneously, flooding velocity and nitrification liquid flow are controlled by intake pump (2) and nitrification liquid reflux pump (11) respectively, and throughput ratio is 1:3～1:3.5; Nitrogenous dirty waste water and the nitrification liquid denitrification filtrating area (3) of flowing through from top to bottom, it is nitrogen by nitrate-nitrogen reduction that denitrifying bacterium in denitrification filtrating area (3) utilizes the organic carbon source in sewage, hydraulic detention time is 30～60min, and dissolved oxygen concentration maintains 0.3～0.5mg/l;
2) removed most of organic nitrogenous dirty waste water from above-mentioned denitrification filtrating area (3) successively by the second supporting layer (4) and middle water layer (5), enter nitrification zone (6), the nitrobacteria of nitrification zone enrichment is oxidized to nitric nitrogen by the ammonia nitrogen in former water, and hydraulic detention time is 20～50min;
3) water after nitrated enters water outlet water tank (9) after by the first supporting layer (7), regulates the valve on filter tank rising pipe (8) to make water outlet flow into out water tank (9) with 400～450% of flooding velocity;
4) go out water in water tank (9) and through nitrification liquid reflux pump (11), be back to denitrification filtrating area (3) with 300～350% nitrate recirculation ratio, rest part discharges through water shoot (10);
5) gas blower (12) carries out aeration by aeration pipeline (13) to BAF, and aeration pipeline is arranged on the first supporting layer (7), and gas and flow direction are contrary, and gas-water ratio is 3～8;
6) gas stream, after middle water layer (5), is discharged in air by gas and water separator (15); In described BAF operational process, when in the middle of recording, the SS of water layer (5) is greater than 15mg/L, denitrification filtrating area (3) are carried out to back flushing, close intake pump (2), nitrification liquid reflux pump (11) and filter tank rising pipe (8), open back flushing intake pump (16) and the second back flushing water inlet pipe (18), backwashing water enters the second supporting layer (4) through the second back flushing water inlet pipe (18), denitrification filtrating area (3) are carried out to back flushing, contain a large amount of suspended substances and discharge by the second back flushing water shoot (20) with the biomembranous water that comes off; In described BAF operational process, when BAF bottom water outlet, SS is greater than 10mg/L, NH
4 +-N is greater than 5mg/L, simultaneously BAF gross head loss be greater than nitrification zone packed height 60% time, to lower, to stream nitration denitrification integral type BAF, carry out back flushing, the gas of gas blower (12) is by aeration pipeline (13), backwashing water is through the first back flushing water inlet pipe (17), enter the first supporting layer (7), back flushing water outlet is first discharged through the first back flushing water shoot (19), then through the second back flushing water discharge line (20) discharge.
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| CN103496786B (en) * | 2013-10-22 | 2015-06-17 | 南京大学 | Low-energy-consumption denitrification biological filter and treatment method thereof |
| CN103979681B (en) * | 2014-04-03 | 2015-06-17 | 江苏蓝晨环保科技有限公司 | Nitrification/denitrification integrated rural domestic sewage treatment system |
| CN106554129A (en) * | 2015-09-25 | 2017-04-05 | 上海凡清环境工程有限公司 | Integral synchronous nitration denitrification sewage-treatment plant |
| CN106746375A (en) * | 2017-03-02 | 2017-05-31 | 辽宁华孚环境工程股份有限公司 | Apparatus and method for processing hardly degraded organic substance in sewage |
| CN107279031B (en) * | 2017-07-04 | 2023-10-27 | 浙江工商大学 | Device and method for purifying water in fish tank |
| CN107892388B (en) * | 2017-11-14 | 2021-03-05 | 东华大学 | Integrated nitrogen and carbon removal and phosphorus removal process and device for advanced treatment of printing and dyeing wastewater |
| CN107892384B (en) * | 2017-11-14 | 2021-06-18 | 东华大学 | Advanced treatment process and device for promoting biological carbon and phosphorus removal of industrial wastewater by iron |
| CN108249565A (en) * | 2018-02-07 | 2018-07-06 | 优德太湖水务（苏州）有限公司 | A kind of depth denitrification filter pool without backwash |
| CN108423800A (en) * | 2018-04-03 | 2018-08-21 | 南京林业大学 | A kind of combination water treatment technology, combination filtrate, bacteria filter system and filter column |
| CN109052786A (en) * | 2018-09-07 | 2018-12-21 | 唐山冀油瑞丰化工有限公司 | A kind of dual-membrane type biological treatment device for petro-chemical waste water treatment |
| CN109354158A (en) * | 2018-11-20 | 2019-02-19 | 上海择希环保工程有限公司 | Bio-trickling filter with denitrification functions |
| CN109574205A (en) * | 2019-01-18 | 2019-04-05 | 厦门陆海科技工程有限公司 | A kind of biofilter and sewage water treatment method |
| CN111635063B (en) * | 2019-03-01 | 2023-02-10 | 四川中科翰林环保科技有限公司 | Breeding sewage treatment equipment and method based on artificial intelligence |
| CN112850897A (en) * | 2021-03-01 | 2021-05-28 | 江西禾一生物科技有限公司 | Organic wastewater treatment system |
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| CN101318735B (en) * | 2008-07-15 | 2010-06-16 | 西南交通大学 | Sewage water denitrification processing method of artificial rapid infiltration system and application thereof |
| CN201485321U (en) * | 2009-08-04 | 2010-05-26 | 朱万益 | High-efficiency composite biological aeration filter |
| CN102001802A (en) * | 2010-12-31 | 2011-04-06 | 上海交通大学 | Nitrification and denitrification combined integral biological filter |
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