CN102126817B - AO high-efficiency nitrogen and phosphorus removal system - Google Patents
AO high-efficiency nitrogen and phosphorus removal system Download PDFInfo
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- CN102126817B CN102126817B CN 201110107844 CN201110107844A CN102126817B CN 102126817 B CN102126817 B CN 102126817B CN 201110107844 CN201110107844 CN 201110107844 CN 201110107844 A CN201110107844 A CN 201110107844A CN 102126817 B CN102126817 B CN 102126817B
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Abstract
The invention discloses an anaerobic-oxic (AO) high-efficiency nitrogen and phosphorus removal system. The AO high-efficiency nitrogen and phosphorus removal system is provided with a secondary sedimentation tank which is communicated with a sewage outflow end of a biological tank, wherein a first-level anoxic zone, an anaerobic zone, a first-level oxic zone, a second-level anoxic zone, a second-level oxic zone, a third-level anoxic zone, a third-level oxic zone, a fourth-level anoxic zone and a fourth-level oxic zone are arranged in the biological tank from sewage inflow to sewage outflow in turn; the secondary sedimentation tank comprises a sewage outflow port and a sludge reflux pipe; the sludge reflux pipe is communicated with the first-level anoxic zone in the biological tank, and is used for injecting reflux sludge into the first-level anoxic zone; sewage is injected from the upper sides of the first-level anoxic zone, the second-level anoxic zone, the third-level anoxic zone and the fourth-level anoxic zone from a sewage inflow port through pipelines respectively; stirrers which ensure that sediments are not generated in mixed liquid are arranged in the anoxic zones and the anaerobic zone from the first level to the fourth level; and the amount of the sewage which is injected into the first-level anoxic zone, the second-level anoxic zone, the third-level anoxic zone and the fourth-level anoxic zone is 0 to 40 percent of inflow rate. By the AO high-efficiency nitrogen and phosphorus removal system, the concentration of the sludge in the subsequent levels is improved, the volume of the biological tank is reduced, and engineering investment is saved.
Description
Technical field
The present invention relates to a kind of AO denitrification dephosphorization system.Particularly relate to a kind of sewage that makes and enter biological tank in different ratio segmentations, form the series connection in a plurality of AO pond at biological tank, utilize that available carbon source provides nutrition as much as possible for polyP bacteria, denitrifying bacteria in the sewage, accelerate its growth, thereby obviously improve the AO high-efficient denitrification and dephosphorization system of denitrogenation dephosphorizing efficient.
Background technology
After the nutritive substances such as organism, nitrogen, phosphorus enter water body in a large number in the municipal effluent, can cause water pollution and eutrophication, therefore, " urban wastewater treatment firm pollutant emission standard " one-level A standard (GB18918-2002) that China promulgated in 2002 has proposed stricter requirement to the emission standard of nitrogen, phosphorus.
The key that realizes one-level A standard stably reaching standard is the stably reaching standard of total nitrogen.Biological denitrificaion needs two processes: nitrifying process and denitrification process.Nitrifying process is just controlled the reformulations of nitrogen, can not realize effective removal of nitrogen, and denitrification process could be realized the removal truly of nitrogen.Emission standard is strict gradually to the requirement of water outlet nitrogen, namely more and more higher requirement has been proposed for nitrated, denitrification process, the tradition denitrification process will reach good denitrification effect, the one, must guarantee the enough nitrated time, to guarantee to satisfy the raised growth of nitrifying bacteria community, reach nitrated purpose, and traditional denitrification dephosphorization technique aeration tank sludge concentration is low, the nitrated time is long, the Chi Rongda that needs, civil engineering costs is high, floor space is large; The 2nd, must guarantee the backflow of aeration tank mixed solution, the nitric nitrogen that aerobic zone is generated is back to the oxygen-starved area, denitrification is carried out smoothly, but increase separately internal reflux ratio with the anaerobic environment of remarkably influenced anoxic pond, and is very unfavorable to the raising of nitric efficiency.Therefore, the denitrification dephosphorization technique of seeking a kind of economical and efficient has become the focus of present sewage disposal research.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of nitric efficiency high, adaptable to change of water quality, the biological tank pond holds bio-reactor little, that construction investment is economized, working cost is low, the AO high-efficient denitrification and dephosphorization system of realization economical and efficient.
The technical solution adopted in the present invention is: a kind of AO high-efficient denitrification and dephosphorization system; the second pond that includes biological tank and be connected with the sewage outflow end of biological tank; flow into the sewage outflow from sewage in the described biological tank and be disposed with the one-level oxygen-starved area; anaerobic zone; the one-level aerobic zone; the secondary oxygen-starved area; the secondary aerobic zone; three grades of oxygen-starved areas; three grades of aerobic zones; level Four oxygen-starved area and level Four aerobic zone; described second pond includes sewage outfall and mud return line; described mud return line is connected with one-level oxygen-starved area in the biological tank; be used for returned sluge is injected the one-level oxygen-starved area; described sewage by the effluent stream entrance by pipeline respectively from the one-level oxygen-starved area; the secondary oxygen-starved area; the top of three grades of oxygen-starved areas and level Four oxygen-starved area is injected; described one-level is provided with to level Four oxygen-starved area and the anaerobic zone guarantees that mixing liquid does not produce the agitator of precipitation, described one-level oxygen-starved area; the secondary oxygen-starved area; the sewage that three grades of oxygen-starved areas and level Four oxygen-starved area are injected is 0～40% of flooding velocity.
The end of described one-level aerobic zone is provided with the motor-driven district of one-level, and the end of described secondary aerobic zone is provided with the motor-driven district of secondary, and the end of described three grades of aerobic zones is provided with three grades of motor-driven districts.
Between the inlet mouth end of one-level aerobic zone, secondary aerobic zone, three grades of aerobic zones and level Four aerobic zone and admission passage, be provided with gas meter and the air flow rate adjustment valve that is interconnected.
Also be provided with the internal reflux point for internal reflux in the described biological tank.
Described internal reflux is interim internal reflux, the internal reflux point is provided with 0-4, described internal reflux point is arranged between oxygen-starved area and the one-level aerobic zone, between secondary oxygen-starved area and the secondary aerobic zone, between three grades of oxygen-starved areas and the three grades of aerobic zones, and between level Four oxygen-starved area and the level Four aerobic zone.
Described one-level to the dissolved oxygen concentration of level Four aerobic zone is about 2mg/l.
AO high-efficient denitrification and dephosphorization of the present invention system, with the high concentration sludge stepwise dilution that second pond refluxes and comes, when to the last entering second pond, its sludge concentration is identical with traditional AO technique.Do not increasing under the processing load condition of second pond, improving what sludge concentration of front, reducing the biological tank pond and held, saving construction investment.Patent of the present invention is compared nitric efficiency with conventional denitrification dephosphorization technique and is significantly strengthened, and working cost is low, and capacity of resisting impact load is strong, and is stable.
Description of drawings
Fig. 1 is the formation synoptic diagram of AO high-efficient denitrification and dephosphorization of the present invention system.
Wherein:
1: one-level oxygen-starved area 2: anaerobic zone
3: one-level aerobic zone 4: the secondary oxygen-starved area
5: 6: three grades of oxygen-starved areas of secondary aerobic zone
7: three grades of aerobic zones 8: level Four oxygen-starved area
9: level Four aerobic zone 10: biological tank
11: second pond 12: sewage outfall
13: mud return line 14: admission passage
15: internal reflux point 16: air flow rate adjustment valve
17: gas meter 18: the effluent stream entrance
19: dissolved oxygen instrument 20: the motor-driven district of one-level
21: 22: three grades of motor-driven districts, the motor-driven district of secondary
Embodiment
The making a detailed description AO high-efficient denitrification and dephosphorization system of the present invention below in conjunction with embodiment and accompanying drawing.
As shown in Figure 1, AO high-efficient denitrification and dephosphorization of the present invention system, the second pond 11 that includes biological tank 10 and be connected with the sewage outflow end of biological tank 10, sewage enters biological tank 10 in different ratios, flows out through second pond 11 again.Flow into the sewage outflow from sewage in the described biological tank 10 and be disposed with one-level oxygen-starved area 1, anaerobic zone 2, one-level aerobic zone 3, the motor-driven district 20 of one-level, secondary oxygen-starved area 4, secondary aerobic zone 5, the motor-driven district 21 of secondary, three grades of oxygen-starved areas 6, three grades of aerobic zones 7, three grades of motor-driven districts 22, level Four oxygen-starved area 8 and level Four aerobic zone 9, described second pond 11 includes sewage outflow 12 and mud return line 13, described mud return line 13 is connected with one-level oxygen-starved area 1 in the biological tank 10, be used for returned sluge is injected one-level oxygen-starved area 1, described sewage by sewage flow into 18 by pipeline respectively from one-level oxygen-starved area 1, secondary oxygen-starved area 4, the top of three grades of oxygen-starved areas 6 and level Four oxygen-starved area 8 is injected, the level Four water entry is taked different traffic distribution strategies according to the difference of processing requirements, described to one-level oxygen-starved area 1, secondary oxygen-starved area 4, the sewage that three grades of oxygen-starved areas 6 and level Four oxygen-starved area 8 are injected is 0～40% of flooding velocity, at first three grade Aerobic Pond 3,5,7 end is provided with motor-driven district 20,21,22, adopt the mode that changes aerobic zone or pond, oxygen-starved area appearance to adapt to the variation of influent quality and flooding velocity.
In order to guarantee that each oxygen-starved area and each anaerobic zone mixed solution do not produce precipitation, described one-level to level Four oxygen-starved area 1,4,6,8 and anaerobic zone 2 in be provided with agitator.
At one-level aerobic zone 3, secondary aerobic zone 5, three grades of aerobic zones 7 and the level Four aerobic zone 9 interior dissolved oxygen instruments 19 that arrange, at one-level aerobic zone 3, secondary aerobic zone 5, be respectively arranged with gas meter 17 and the air flow rate adjustment valve 16 that is interconnected between the inlet mouth end of three grades of aerobic zones 7 and level Four aerobic zone 9 and the admission passage 14, advance according to treatment plant, the variation tendency of effluent quality and dissolved oxygen, actual measurement gas flow numerical value, automatically regulate the aperture of air flow rate adjustment valve (16), to guarantee that one-level is to level Four aerobic zone 3,5,7,9 dissolved oxygen concentration is about 2mg/L.
Described biological tank 10 interior differences according to processing requirements also are provided with the internal reflux point 15 that (or not establishing) is used for internal reflux.Described internal reflux is interim internal reflux, and internal reflux point 15 is provided with 0-4, and described internal reflux is put 15 places and is provided with reflux pump.Described internal reflux point 15 can be arranged between oxygen-starved area 1 and the one-level aerobic zone 3, or between secondary oxygen-starved area 4 and the secondary aerobic zone 5, or between three grades of oxygen-starved areas 6 and the three grades of aerobic zones 7, or between level Four oxygen-starved area 8 and the level Four aerobic zone 9, or be arranged on 0-4 position in above-mentioned these 4 positions.
AO high-efficient denitrification and dephosphorization of the present invention system, sewage is divided into four parts and enters one-level oxygen-starved area 1, the secondary oxygen-starved area 4 of biological tank, three grades of oxygen-starved areas 6 and level Four oxygen-starved area 8 in different ratio segmentations, the returned sluge that the while second pond provides enters from top, progressively mix with sewage, form the series connection in a plurality of AO pond at biological tank, utilize that available carbon source provides nutrition as much as possible for polyP bacteria, denitrifying bacteria in the sewage, accelerate its growth, thereby obviously improve the efficient of denitrogenation dephosphorizing.The high concentration sludge stepwise dilution that native system refluxes second pond to come, when to the last entering second pond, its sludge concentration is identical with traditional AO technique.Do not increasing under the processing load condition of second pond, improving what sludge concentration of front, reducing the biological tank pond and held, saving construction investment.The present invention compares nitric efficiency with conventional denitrification dephosphorization technique and significantly strengthens, and working cost is low, and capacity of resisting impact load is strong, and is stable.
Claims (4)
1. AO high-efficient denitrification and dephosphorization system; the second pond (11) that includes biological tank (10) and be connected with the sewage outflow end of biological tank (10); flow into the sewage outflow from sewage in the described biological tank (10) and be disposed with one-level oxygen-starved area (1); anaerobic zone (2); one-level aerobic zone (3); secondary oxygen-starved area (4); secondary aerobic zone (5); three grades of oxygen-starved areas (6); three grades of aerobic zones (7); level Four oxygen-starved area (8) and level Four aerobic zone (9); described second pond (11) includes sewage outfall (12) and mud return line (13); described mud return line (13) is connected with one-level oxygen-starved area (1) in the biological tank (10); be used for returned sluge is injected one-level oxygen-starved area (1); described sewage by effluent stream entrance (18) by pipeline respectively from one-level oxygen-starved area (1); secondary oxygen-starved area (4); the top of three grades of oxygen-starved areas (6) and level Four oxygen-starved area (8) is injected; it is characterized in that; described one-level is to level Four oxygen-starved area (1; 4; 6; 8) and be provided with in the anaerobic zone (2) and guarantee that mixing liquid does not produce the agitator of precipitation; described one-level oxygen-starved area (1); secondary oxygen-starved area (4); the sewage that three grades of oxygen-starved areas (6) and level Four oxygen-starved area (8) are injected is 0～40% of flooding velocity; the end of described one-level aerobic zone (3) is provided with the motor-driven district of one-level (20); the end of described secondary aerobic zone (5) is provided with the motor-driven district of secondary (21); the end of described three grades of aerobic zones (7) is provided with three grades of motor-driven districts (22); also be provided with the internal reflux point (15) for internal reflux in the described biological tank (10), described internal reflux point (15) locates to be provided with reflux pump.
2. AO high-efficient denitrification and dephosphorization according to claim 1 system, it is characterized in that, between the inlet mouth end of one-level aerobic zone (3), secondary aerobic zone (5), three grades of aerobic zones (7) and level Four aerobic zone (9) and admission passage (14), be provided with gas meter (17) and the air flow rate adjustment valve (16) that is interconnected.
3. AO high-efficient denitrification and dephosphorization according to claim 1 system, it is characterized in that, described internal reflux is interim internal reflux, internal reflux point (15) is provided with 0-4, and do not comprise 0, described internal reflux point (15) is arranged between one-level oxygen-starved area (1) and the one-level aerobic zone (3), between secondary oxygen-starved area (4) and the secondary aerobic zone (5), between three grades of oxygen-starved areas (6) and the three grades of aerobic zones (7), and between level Four oxygen-starved area (8) and the level Four aerobic zone (9).
4. AO high-efficient denitrification and dephosphorization according to claim 2 system is characterized in that described one-level to the dissolved oxygen concentration of level Four aerobic zone (3,5,7,9) is 2mg/l.
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| CN 201110107844 CN102126817B (en) | 2011-04-27 | 2011-04-27 | AO high-efficiency nitrogen and phosphorus removal system |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102936085B (en) * | 2012-12-07 | 2015-01-07 | 焦作中持水务有限公司 | Stacked biological denitrification sewage treatment technology and device |
| CN103332788B (en) * | 2013-07-19 | 2015-04-08 | 环境保护部南京环境科学研究所 | Multi-stage anaerobic-aerobic combined nitrogen and phosphorus removing device and method for rural domestic sewage |
| CN104261614A (en) * | 2014-08-05 | 2015-01-07 | 天津市市政工程设计研究院 | Step-feed multi-stage AO+MBR (Anoxic/Oxic+Membrane Biological Reactor) nitrogen and phosphorus removal system |
| CN104671601B (en) * | 2015-01-30 | 2016-06-15 | 沈阳建筑大学 | A kind of many echelons Anoxic/Aerobic bioreactor and control method thereof |
| CN111606418A (en) * | 2020-04-28 | 2020-09-01 | 中国市政工程中南设计研究总院有限公司 | Subsection water inlet inversion A2O coupling multistage AO biological pond + MBR degree of depth nitrogen and phosphorus removal system |
Citations (5)
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|---|---|---|---|---|
| CN1480413A (en) * | 2002-09-04 | 2004-03-10 | 毕学军 | Treating technical method for denitrogenation and dephosphorization from waste water |
| CN1769212A (en) * | 2005-09-14 | 2006-05-10 | 哈尔滨工业大学 | Method for hydraulicly controlling mud age in segmental influent and biological denitrification process |
| CN101104541A (en) * | 2007-06-28 | 2008-01-16 | 北京工业大学 | Modified four-section water-feeding A/O deep denitrogenation device and process control method |
| CN101439908A (en) * | 2008-12-10 | 2009-05-27 | 中国矿业大学 | Anaerobic multi-stage aerobic-anoxic dephosphorization and denitrification process |
| CN201458900U (en) * | 2009-06-10 | 2010-05-12 | 北京工业大学 | Improved segmentation water inlet depth nitrogen and phosphorus removing device |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1480413A (en) * | 2002-09-04 | 2004-03-10 | 毕学军 | Treating technical method for denitrogenation and dephosphorization from waste water |
| CN1769212A (en) * | 2005-09-14 | 2006-05-10 | 哈尔滨工业大学 | Method for hydraulicly controlling mud age in segmental influent and biological denitrification process |
| CN101104541A (en) * | 2007-06-28 | 2008-01-16 | 北京工业大学 | Modified four-section water-feeding A/O deep denitrogenation device and process control method |
| CN101439908A (en) * | 2008-12-10 | 2009-05-27 | 中国矿业大学 | Anaerobic multi-stage aerobic-anoxic dephosphorization and denitrification process |
| CN201458900U (en) * | 2009-06-10 | 2010-05-12 | 北京工业大学 | Improved segmentation water inlet depth nitrogen and phosphorus removing device |
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Address after: 300051 No. 239, Yingkou Road, Heping District, Tianjin Patentee after: Tianjin municipal engineering design and Research Institute Co.,Ltd. Address before: 300051 No. 239, Yingkou Road, Heping District, Tianjin Patentee before: TIANJIN MUNICIPAL ENGINEERING DESIGN & Research Institute |