CN113321302A - Oxidation ditch type A2/O nitrogen and phosphorus removal system - Google Patents
Oxidation ditch type A2/O nitrogen and phosphorus removal system Download PDFInfo
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- CN113321302A CN113321302A CN202110660280.9A CN202110660280A CN113321302A CN 113321302 A CN113321302 A CN 113321302A CN 202110660280 A CN202110660280 A CN 202110660280A CN 113321302 A CN113321302 A CN 113321302A
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- anoxic
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/006—Regulation methods for biological treatment
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
- C02F3/308—Biological phosphorus removal
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
Abstract
The invention provides an oxidation ditch type A2/O nitrogen and phosphorus removal system, which comprises an oxidation ditch, wherein a pre-anoxic zone, an anaerobic zone, an anoxic zone and an aerobic zone are arranged in the oxidation ditch, and the pre-anoxic zone and the anaerobic zone are communicated with each other; the anoxic zone is divided into an anoxic flow channel I, an anoxic flow channel II, an anoxic flow channel III and an anoxic flow channel IV which are sequentially communicated by a partition plate, and the tail end of the anoxic flow channel IV is communicated with the initial end of the anoxic flow channel I; the aerobic zone is divided into an aerobic flow channel I, an aerobic flow channel II, an aerobic flow channel III and an aerobic flow channel IV which are communicated in sequence by the partition plate; the initial end of the first anoxic flow passage, the tail end of the fourth anoxic flow passage, the initial end of the first aerobic flow passage and the tail end of the fourth aerobic flow passage form a collecting area, and a flow guide structure and a water collecting well are arranged at the collecting area. The invention can flexibly control the water flow in the oxidation ditch, form a benign internal circulation and improve the TN removal rate so as to improve the effluent quality.
Description
Technical Field
The invention relates to the technical field of sewage treatment, in particular to an oxidation ditch type A2/O nitrogen and phosphorus removal system.
Background
The A2/O process is a commonly used sewage treatment process with synchronous biological nitrogen and phosphorus removal functions, has simple structure, short hydraulic retention time, difficult sludge expansion and mature design and operation experience, and becomes one of the most widely applied sewage treatment processes in the world. The oxidation ditch pool type has the characteristic of plug flow state, so that the concentration of the dissolved oxygen forms a concentration gradient along the length direction of the pool, and aerobic, anoxic and anaerobic conditions are formed. The oxidation ditch type A2/O process combining the A2/O process and the oxidation ditch process effectively exerts the advantages of the A2/O process of nitrogen and phosphorus removal and the oxidation ditch process of high-efficiency organic matter removal, has the advantages of less construction investment, low treatment cost, good effluent quality and strong impact load resistance, and is more and more widely applied.
The oxidation ditch type A2/O process utilizes the circulation flow of sewage and activated sludge mixed liquor in a closed ditch to form an aerobic zone and an anoxic zone, the aerobic and anoxic processes are completed in one pool, each part is separated into a system by a partition wall, and an unpowered internal reflux system is adopted to form the aerobic and anoxic circulation. The joint of the aerobic zone and the anoxic zone has a plurality of water flows which circulate, namely, a circulating water flow formed from the tail end of the aerobic zone to the initial end of the aerobic zone, a circulating water flow formed from the tail end of the anoxic zone to the initial end of the anoxic zone, and a two-zone circulating water flow formed from the aerobic zone to the anoxic zone. Under the interaction and influence of multi-direction water flow, an internal reflux system is difficult to control, the internal reflux amount cannot meet the production requirement, the TN removal rate is low, and the effluent quality is influenced.
In view of this, it is necessary to research an internal reflux system suitable for the oxidation ditch type a2/O process to effectively control the internal reflux amount, improve the TN removal rate, and ensure that the effluent reaches the standard.
Disclosure of Invention
The invention aims to provide an oxidation ditch type A2/O nitrogen and phosphorus removal system aiming at the defects of the prior art, and the specific scheme is as follows:
an oxidation ditch type A2/O nitrogen and phosphorus removal system comprises an oxidation ditch, wherein a pre-anoxic zone, an anaerobic zone, an anoxic zone and an aerobic zone are arranged in the oxidation ditch, and the pre-anoxic zone and the anaerobic zone are communicated with each other; the anoxic zone is internally divided into an anoxic runner I, an anoxic runner II, an anoxic runner III and an anoxic runner IV which are sequentially communicated by a partition plate, and the tail end of the anoxic runner IV is communicated with the initial end of the anoxic runner I; the aerobic zone is divided into an aerobic flow channel I, an aerobic flow channel II, an aerobic flow channel III and an aerobic flow channel IV which are communicated in sequence by the partition plate; a gathering area is formed at the starting end of the first anoxic runner, the tail end of the fourth anoxic runner, the starting end of the first aerobic runner and the tail end of the fourth aerobic runner, and a flow guide structure and a water collecting well are arranged at the gathering area; the diversion structure divides the sewage at the four tail ends of the anoxic runner into two parts, one part is diverted to the initial end of the anoxic runner, the other part is diverted to the initial end of the aerobic runner, and the flow entering the initial end of the anoxic runner is greater than the flow entering the initial end of the aerobic runner; the diversion structure divides the sewage at the four tail ends of the aerobic runner into two parts, one part is diverted to the initial end of the aerobic runner, and the other part is diverted to the water collecting well; the oxidation ditch is equipped with the inlet tube outward, the end of inlet tube is equipped with the lateral pipe that gets into anoxic zone in advance, anaerobic zone respectively, and anaerobic zone is equipped with the connecting pipe that extends to an anoxic runner top, and aerobic runner four ends are equipped with the delivery pipe that extends to the outer secondary sedimentation pond of oxidation ditch, secondary sedimentation tank bottom is equipped with the back flow that extends to anoxic zone in advance, be equipped with the sludge pump on the back flow.
Based on the above, the water conservancy diversion structure is including being located the butterfly wall that gathers the district, the left and right sides of butterfly wall is the arcwall face, and both sides are the plane around, and the front side plane is equipped with the L type wall to the extension of oxygen deficiency runner one, and the rear side plane is equipped with the linear type wall to the extension of good oxygen runner one, be equipped with the wall pump that wears that is used for discharging the partial sewage in the sump pit into oxygen deficiency runner one on the L type wall.
Based on the above, the rated voltage of the wall-through pump is 380V, the rated power is 25kw, and the rated flow is 360L/min.
Compared with the prior art, the invention has outstanding substantive characteristics and remarkable progress, and particularly has the following advantages:
1. the oxidation ditch type A2/O nitrogen and phosphorus removal system provided by the invention can flexibly control the water flow in the oxidation ditch, can realize effective control on the internal reflux flow under different operating conditions, overcomes the defect that the internal reflux flow cannot be controlled due to unpowered reflux of sewage in the traditional oxidation ditch, effectively improves the TN removal rate and improves the effluent quality.
2. The design of water conservancy diversion structure has reduced the interception effect that the inside circulation rivers of anoxic zone got into anoxic zone rivers to aerobic zone, has reduced the interception effect that the inside circulation rivers of aerobic zone got into aerobic zone rivers to the anoxic zone, has effectively guaranteed the circulation flow of sewage between anoxic zone and aerobic zone.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention.
In the figure: 1. an oxidation ditch; 2. a secondary sedimentation tank; 3. a pre-anoxic zone; 4. an anaerobic zone; 5. an anoxic zone; 6. an aerobic zone; 7. a water inlet pipe; 8. a branch pipe; 9. a partition plate; 10. a butterfly wall; 11. a connecting pipe; 13. a discharge pipe; 15. a return pipe; 16. a sludge pump; 17. a water collecting well; 18. a through-wall pump.
Detailed Description
The technical solution of the present invention is further described in detail by the following embodiments.
Examples
As shown in FIG. 1, the invention provides an oxidation ditch type A2/O nitrogen and phosphorus removal system, which comprises an oxidation ditch 1, wherein a pre-anoxic zone 3, an anaerobic zone 4, an anoxic zone 5 and an aerobic zone 6 are arranged in the oxidation ditch 1, and the pre-anoxic zone 3 and the anaerobic zone 4 are communicated with each other; the anoxic zone 5 is internally divided into an anoxic flow channel I, an anoxic flow channel II, an anoxic flow channel III and an anoxic flow channel IV which are sequentially communicated by a partition plate 9, and the tail end of the anoxic flow channel IV is communicated with the initial end of the anoxic flow channel I; the aerobic zone 6 is divided into an aerobic flow channel I, an aerobic flow channel II, an aerobic flow channel III and an aerobic flow channel IV which are communicated in sequence by a partition plate 9; a collecting area is formed by the initial end of the first anoxic runner, the tail end of the fourth anoxic runner, the initial end of the first aerobic runner and the tail end of the fourth aerobic runner, and a flow guide structure and a water collecting well 17 are arranged at the collecting area; the diversion structure divides the sewage at the four tail ends of the anoxic runner into two parts, one part is diverted to the initial end of the anoxic runner, the other part is diverted to the initial end of the aerobic runner, and the flow entering the initial end of the anoxic runner is greater than the flow entering the initial end of the aerobic runner; the diversion structure divides the sewage at the four tail ends of the aerobic flow channel into two parts, one part is diverted to the initial end of the aerobic flow channel, and the other part is diverted to the water collecting well 17; the oxidation ditch 1 is externally provided with a water inlet pipe 7, the tail end of the water inlet pipe 7 is provided with a branch pipe 8 which enters the pre-anoxic zone 3 and the anaerobic zone 4 respectively, the anaerobic zone 4 is provided with a connecting pipe 11 which extends to the initial end of the anoxic runner, the four tail ends of the aerobic runner are provided with a discharge pipe 13 which extends to the secondary sedimentation tank 2 outside the oxidation ditch 1, the bottom of the secondary sedimentation tank 2 is provided with a return pipe 15 which extends to the pre-anoxic zone 3, and the return pipe 15 is provided with a sludge pump 16.
The flow guide structure comprises a butterfly wall 10 located in a collection area, the left side and the right side of the butterfly wall 10 are arc-shaped surfaces, the front side and the rear side of the butterfly wall are planes, an L-shaped wall extending towards an anoxic runner I is arranged on the front side plane, a linear wall extending towards an aerobic runner I is arranged on the rear side plane, and a wall penetrating pump 18 for discharging partial sewage in a water collecting well 17 into the anoxic runner I is arranged on the L-shaped wall.
The rated voltage of the through-wall pump 18 is 380V, the rated power is 25kw, and the rated flow is 360L/min.
The oxidation ditch type A2/O nitrogen and phosphorus removal system provided by the invention can flexibly control the water flow in the oxidation ditch 1, can realize effective control on the internal reflux flow under different operating conditions, overcomes the defect that the internal reflux flow cannot be controlled due to unpowered reflux of sewage in the traditional oxidation ditch 1, effectively improves the TN removal rate and improves the effluent quality.
The design of water conservancy diversion structure has reduced 5 internal circulation rivers in anoxic zone to 6 interception effects that get into 5 rivers in anoxic zone in aerobic zone, has reduced 6 internal circulation rivers in aerobic zone and has got into 6 rivers in aerobic zone in anoxic zone 5 and held back the effect, has effectively guaranteed the circulation flow of sewage between anoxic zone 5 and aerobic zone 6.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention and not to limit it; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art will understand that: modifications to the specific embodiments of the invention or equivalent substitutions for parts of the technical features may be made; without departing from the spirit of the present invention, it is intended to cover all aspects of the invention as defined by the appended claims.
Claims (3)
1. An oxidation ditch type A2/O nitrogen and phosphorus removal system is characterized in that: the device comprises an oxidation ditch (1), wherein a pre-anoxic zone (3), an anaerobic zone (4), an anoxic zone (5) and an aerobic zone (6) are arranged in the oxidation ditch (1), and the pre-anoxic zone (3) and the anaerobic zone (4) are communicated with each other; the anoxic zone (5) is internally divided into an anoxic flow channel I, an anoxic flow channel II, an anoxic flow channel III and an anoxic flow channel IV which are sequentially communicated by a partition plate (9), and the tail end of the anoxic flow channel IV is communicated with the initial end of the anoxic flow channel I; the aerobic zone (6) is divided into an aerobic flow channel I, an aerobic flow channel II, an aerobic flow channel III and an aerobic flow channel IV which are communicated in sequence by a partition plate (9); a gathering area is formed at the starting end of the first anoxic runner, the tail end of the fourth anoxic runner, the starting end of the first aerobic runner and the tail end of the fourth aerobic runner, and a flow guide structure and a water collecting well (17) are arranged at the gathering area; the diversion structure divides the sewage at the four tail ends of the anoxic runner into two parts, one part is diverted to the initial end of the anoxic runner, the other part is diverted to the initial end of the aerobic runner, and the flow entering the initial end of the anoxic runner is greater than the flow entering the initial end of the aerobic runner; the diversion structure divides the sewage at the four tail ends of the aerobic flow channel into two parts, one part is diverted to the initial end of the aerobic flow channel, and the other part is diverted to the water collecting well (17); be equipped with inlet tube (7) outside oxidation ditch (1), the end of inlet tube (7) is equipped with lateral pipe (8) that gets into anoxic zone (3), anaerobic zone (4) respectively, and anaerobic zone (4) are equipped with connecting pipe (11) that extend to an anoxic runner top, and four ends of aerobic runner are equipped with and extend to the delivery pipe (13) that are located oxidation ditch (1) outer secondary sedimentation tank (2), secondary sedimentation tank (2) bottom is equipped with back flow (15) that extend to anoxic zone (3) in advance, be equipped with sludge pump (16) on back flow (15).
2. The oxidation ditch type A2/O nitrogen and phosphorus removal system of claim 1, wherein: the flow guide structure comprises a butterfly wall (10) located in a collection area, the left side and the right side of the butterfly wall (10) are arc-shaped surfaces, the front side and the rear side of the butterfly wall are planes, an L-shaped wall extending to an anoxic flow channel is arranged on the front side plane, a linear wall extending to an aerobic flow channel is arranged on the rear side plane, and a wall penetrating pump (18) used for discharging partial sewage in a water collecting well (17) into the anoxic flow channel is arranged on the L-shaped wall.
3. The oxidation ditch type A2/O nitrogen and phosphorus removal system of claim 1, wherein: the rated voltage of the through-wall pump (18) is 380V, the rated power is 25kw, and the rated flow is 360L/min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110660280.9A CN113321302B (en) | 2021-06-15 | 2021-06-15 | Oxidation ditch type A2/O nitrogen and phosphorus removal system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110660280.9A CN113321302B (en) | 2021-06-15 | 2021-06-15 | Oxidation ditch type A2/O nitrogen and phosphorus removal system |
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| CN113321302A true CN113321302A (en) | 2021-08-31 |
| CN113321302B CN113321302B (en) | 2022-12-13 |
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Citations (9)
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|---|---|---|---|---|
| CN2546439Y (en) * | 2002-05-15 | 2003-04-23 | 常建一 | Active sludge biological treating tank |
| CN101269882A (en) * | 2008-04-10 | 2008-09-24 | 贵州省建筑设计研究院 | Integrated oxidation ditch, construction and operation method |
| WO2012010096A1 (en) * | 2010-07-20 | 2012-01-26 | 华南理工大学 | Device for synchronously removing nitrogen and phosphorus in mixed municipal sewage and fecal sewage by using a2/o-biomembrane and method thereof |
| CN103435231A (en) * | 2013-09-05 | 2013-12-11 | 中国水电顾问集团中南勘测设计研究院 | Intensive nitrogen-phosphorus removing membrane biological reaction device and sewage treatment method |
| CN103663698A (en) * | 2013-12-27 | 2014-03-26 | 西安建筑科技大学 | Method and structure for holing and flow regime regulation without changes in tank shape of oxidation ditch |
| CN108002537A (en) * | 2018-01-31 | 2018-05-08 | 武汉都市环保工程技术股份有限公司 | Oxidation ditch integrated sewage treating apparatus and system |
| CN208182695U (en) * | 2018-03-06 | 2018-12-04 | 重庆清禧环保科技有限公司 | oxidation ditch |
| CN109987702A (en) * | 2019-03-18 | 2019-07-09 | 沈阳建筑大学 | A kind of process of synchronous denitrification dephosphorizing oxidation ditch and its strengthened denitrification |
| US20200156975A1 (en) * | 2018-03-08 | 2020-05-21 | Dalian University Of Technology | Method of upgrading the activated sludge process based on functional suspended carriers in the wastewater biological treatment process |
-
2021
- 2021-06-15 CN CN202110660280.9A patent/CN113321302B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2546439Y (en) * | 2002-05-15 | 2003-04-23 | 常建一 | Active sludge biological treating tank |
| CN101269882A (en) * | 2008-04-10 | 2008-09-24 | 贵州省建筑设计研究院 | Integrated oxidation ditch, construction and operation method |
| WO2012010096A1 (en) * | 2010-07-20 | 2012-01-26 | 华南理工大学 | Device for synchronously removing nitrogen and phosphorus in mixed municipal sewage and fecal sewage by using a2/o-biomembrane and method thereof |
| CN103435231A (en) * | 2013-09-05 | 2013-12-11 | 中国水电顾问集团中南勘测设计研究院 | Intensive nitrogen-phosphorus removing membrane biological reaction device and sewage treatment method |
| CN103663698A (en) * | 2013-12-27 | 2014-03-26 | 西安建筑科技大学 | Method and structure for holing and flow regime regulation without changes in tank shape of oxidation ditch |
| CN108002537A (en) * | 2018-01-31 | 2018-05-08 | 武汉都市环保工程技术股份有限公司 | Oxidation ditch integrated sewage treating apparatus and system |
| CN208182695U (en) * | 2018-03-06 | 2018-12-04 | 重庆清禧环保科技有限公司 | oxidation ditch |
| US20200156975A1 (en) * | 2018-03-08 | 2020-05-21 | Dalian University Of Technology | Method of upgrading the activated sludge process based on functional suspended carriers in the wastewater biological treatment process |
| CN109987702A (en) * | 2019-03-18 | 2019-07-09 | 沈阳建筑大学 | A kind of process of synchronous denitrification dephosphorizing oxidation ditch and its strengthened denitrification |
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| CN113321302B (en) | 2022-12-13 |
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