CN111777180A - OAAOA-MBR sewage treatment process based on enhanced endogenous denitrification and energy conservation - Google Patents
OAAOA-MBR sewage treatment process based on enhanced endogenous denitrification and energy conservation Download PDFInfo
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- CN111777180A CN111777180A CN202010606202.6A CN202010606202A CN111777180A CN 111777180 A CN111777180 A CN 111777180A CN 202010606202 A CN202010606202 A CN 202010606202A CN 111777180 A CN111777180 A CN 111777180A
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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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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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Abstract
The invention relates to a sewage treatment process, in particular to an OAAOA-MBR sewage treatment process based on enhanced endogenous denitrification and energy conservation, and belongs to the field of sewage treatment. The method comprises the following steps: firstly, sewage is pretreated by a superfine grating and the like, large-volume pollutants are intercepted, larger impurities in the sewage are removed, solid impurities obtained by treatment are separately collected and treated, and supernatant obtained by treatment enters a front-arranged first-stage aerobic pool, a first-stage anoxic pool and an anaerobic pool respectively. The invention has the beneficial effects that: on the basis of an AAOA-MBR process, the anaerobic-anoxic-aerobic process is changed into the anoxic-anaerobic-aerobic process, a preposed aerobic tank is added, the MBR process is used for replacing the traditional secondary sedimentation tank and the traditional filtering process, the water inlet distribution and internal reflux modes are optimized, MBR mixed liquid flows back to the preposed primary aerobic tank, and the secondary anoxic tank mixed liquid flows back to the anaerobic tank.
Description
Technical Field
The invention relates to a sewage treatment process, in particular to an OAAOA-MBR sewage treatment process based on enhanced endogenous denitrification and energy conservation, and belongs to the field of sewage treatment.
Background
Along with the development of society, the urbanization process is faster and faster, the urban sewage treatment also becomes a social problem to be solved urgently, especially when carbon source pollutants are removed, the consideration of denitrification and dephosphorization also becomes a focus of attention, the common process adopted in the decontamination process at present is the enhancement of endogenous denitrification AAOA-MBR, the treatment capacity of mixed liquor flowing back to an aerobic tank from an MBR membrane tank in the process is 3-5 times of that of the mixed liquor, not only independent equipment is needed, but also a large amount of energy is consumed, in the process, the membrane module of the MBR membrane tank needs enough air to purge to prevent pollution blockage, the aeration amount suggested by a flat membrane is 10-12L/min, and is far larger than the oxygen demand of activated sludge, so that the dissolved oxygen in the membrane tank is ultrahigh and is far higher than the dissolved oxygen concentration range of the aerobic tank, namely, the aeration is excessive, and if the oxygen cannot be reused, the waste is caused. Therefore, there is a need for a process that can ensure stable denitrification and dephosphorization efficiency and reduce equipment investment and operation cost.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: overcomes the defects in the prior art, and provides an OAAOA-MBR sewage treatment process based on enhanced endogenous denitrification and energy conservation.
The technical scheme for solving the technical problems is as follows:
as shown in figure 1, the OAAOA-MBR sewage treatment process based on enhanced endogenous denitrification and energy conservation comprises the following steps:
firstly, sewage is pretreated by a superfine grating and the like, large-volume pollutants are intercepted, larger impurities in the sewage are removed, solid impurities obtained by treatment are separately collected and treated, supernatant solution obtained by treatment enters a front first-stage aerobic pool, a first-stage anoxic pool and an anaerobic pool respectively, biochemical treatment is carried out on the sewage in the front first-stage aerobic pool, the concentration of organic matters in the sewage is reduced, meanwhile, ammonia nitrogen in the wastewater is converted into nitrate nitrogen, the concentration of the nitrate nitrogen is improved, and the reaction denitrification in the first-stage anoxic pool is facilitated; the primary anoxic tank mainly performs denitrification, and activated sludge mixed liquor which automatically flows into the primary anoxic tank from the front primary aerobic tank has nitrate nitrogen with higher concentration; the anaerobic tank is mainly used for removing phosphorus, the activated sludge releases phosphorus in an anaerobic environment, and when the activated sludge is treated in an aerobic state again, more phosphorus can be absorbed, so that the biological phosphorus removal efficiency is improved;
step two, automatically flowing the activated sludge mixed liquor obtained by treatment in the primary aerobic tank, the primary anoxic tank and the anaerobic tank which are arranged in the step one to a secondary aerobic tank, then removing organic matters from the activated sludge mixed liquor to reduce the concentration of the organic matters to the minimum, and automatically flowing the activated sludge mixed liquor to the secondary anoxic tank;
step three, enabling the activated sludge mixed liquor treated in the step two to automatically flow into a secondary anoxic tank for denitrification reaction, reducing the total nitrogen concentration of effluent, fully reacting nitrate nitrogen in the secondary anoxic tank under the action of an external carbon source to form nitrogen, enabling a part of activated sludge mixed liquor to enter an MBR membrane tank, and enabling the other part of activated sludge mixed liquor to flow back to the anaerobic tank through a reflux pump;
step four, removing organic matters from the activated sludge mixed liquor which flows to the MBR membrane tank automatically in the step four, filtering by a membrane module, separating clear water which reaches the standard, outputting the clear water to a system, continuously recycling the residual nitrified liquid, refluxing to the preposed first-stage aerobic tank by a reflux pump, fully utilizing the surplus oxygen of the MBR membrane tank, supplementing a proper amount of air to meet the dissolved oxygen requirement of biochemical reaction in the preposed first-stage aerobic tank, and discharging a part of sludge to a sludge tank from a sludge port;
preferably, the second-stage anoxic tank in the third step has low organic matter content, which often affects denitrification efficiency, and the second-stage anoxic tank is supplemented with an organic carbon source to promote denitrification reaction and reduce the total nitrogen concentration of effluent.
Preferably, the carbon source in step three is sodium acetate.
Preferably, in the fourth step, the concentration range of suspended solids in MBR mixed solution in the MBR membrane tank is 10-20 g MLSS/L of the flat membrane.
Preferably, the nitrifying liquid in the fourth step flows back to the front first-stage aerobic tank from the MBR membrane tank through a reflux pump, and the reflux amount is generally 4-6 times.
Preferably, in the MBR membrane tank of the fourth step, the membrane bioreactor is an immersed membrane bioreactor.
The invention has the beneficial effects that: on the basis of an AAOA-MBR process, the anaerobic-anoxic-aerobic process is changed into the anoxic-anaerobic-aerobic process, a preposed aerobic tank is added, the MBR process is used for replacing the traditional secondary sedimentation tank and the traditional filtering process, the water inlet distribution and internal reflux modes are optimized, MBR mixed liquid flows back to the preposed primary aerobic tank, the secondary anoxic tank mixed liquid flows back to the anaerobic tank, the improved MBR mixed liquid flows back to the preposed primary aerobic tank, and the preposed primary aerobic tank can fully utilize the surplus oxygen in the MBR membrane tank and supplement air in a small amount to meet the dissolved oxygen requirement of biochemical reaction.
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FIG. 1 is a process flow diagram of the present invention.
In the figure, 1, a primary aerobic tank is arranged in front; 2. a first-stage anoxic tank; 3. an anaerobic tank; 4. a secondary aerobic tank; 5. a secondary anoxic tank; 6. and (4) an MBR membrane tank.
Detailed Description
The principles and features of this invention are described below in conjunction with examples which are set forth to illustrate, but are not to be construed to limit the scope of the invention.
As shown in figure 1, the OAAOA-MBR sewage treatment process based on enhanced endogenous denitrification and energy conservation comprises the following steps:
firstly, sewage is pretreated by a superfine grating and the like, large-volume pollutants are intercepted, larger impurities in the sewage are removed, solid impurities obtained by treatment are separately collected and treated, supernatant obtained by treatment enters a front-stage aerobic pool 1, a front-stage anoxic pool 2 and an anaerobic pool 3 respectively, biochemical treatment is carried out on the sewage in the front-stage aerobic pool 1, the concentration of organic matters in the sewage is reduced, meanwhile, ammonia nitrogen in the sewage is converted into nitrate nitrogen, the concentration of the nitrate nitrogen is improved, and the reaction denitrification of the front-stage anoxic pool 2 is facilitated; the primary anoxic tank 2 mainly performs denitrification, and active sludge mixed liquor which automatically flows into the primary anoxic tank 1 from the front primary aerobic tank has nitrate nitrogen with higher concentration; the anaerobic tank 3 is mainly used for removing phosphorus, the activated sludge releases phosphorus in an anaerobic environment, and when the activated sludge is treated in an aerobic state again, more phosphorus can be absorbed, so that the biological phosphorus removal efficiency is improved;
step two, automatically flowing the activated sludge mixed liquor obtained by treatment in the primary aerobic tank 1, the primary anoxic tank 2 and the anaerobic tank 3 which are arranged in the step one to a secondary aerobic tank 4, then removing organic matters from the activated sludge mixed liquor to reduce the concentration of the organic matters to the minimum, and automatically flowing the activated sludge mixed liquor to a secondary anoxic tank 5;
step three, enabling the activated sludge mixed liquor treated in the step two to automatically flow into a secondary anoxic tank 5 for denitrification reaction, reducing the total nitrogen concentration of effluent, fully reacting nitrate nitrogen in the secondary anoxic tank 5 under the action of an external carbon source to form nitrogen, enabling a part of activated sludge mixed liquor to enter an MBR membrane tank 6, and enabling the other part of activated sludge mixed liquor to flow back to an anaerobic tank 3 through a reflux pump;
step four, removing organic matters from the activated sludge mixed liquor flowing to the MBR membrane tank 6 in the step four, filtering by a membrane module, separating clear water reaching the standard, outputting the clear water to a system, continuously recycling the residual nitrified liquid, refluxing to the preposed first-stage aerobic tank 1 by a reflux pump, fully utilizing the surplus oxygen of the MBR membrane tank 6, supplementing a proper amount of air to meet the dissolved oxygen requirement of biochemical reaction in the preposed first-stage aerobic tank 1, and discharging a part of sludge to a sludge tank from a sludge port;
in the third step, the second-stage anoxic tank 5 has low organic matter content, which often affects denitrification efficiency, and the second-stage anoxic tank 5 is supplemented with an organic carbon source to promote denitrification reaction and reduce the total nitrogen concentration of effluent.
The carbon source in the third step is sodium acetate.
In the fourth step, the concentration range of suspended solid of MBR mixed solution in the MBR membrane tank 6 is 10-20 g MLSS/L of flat membrane.
And in the fourth step, the nitrified liquid flows back to the front-stage aerobic tank 1 from the MBR membrane tank 6 through a reflux pump, and the reflux amount is generally 4-6 times.
In the fourth step, in the MBR membrane tank 6, the membrane bioreactor is an immersed membrane bioreactor.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (6)
1. An OAAOA-MBR sewage treatment process based on enhanced endogenous denitrification and energy conservation is characterized in that: the method comprises the following steps:
firstly, sewage is pretreated by a superfine grating and the like, large-volume pollutants are intercepted, larger impurities in the sewage are removed, solid impurities obtained by treatment are separately collected and treated, supernatant solution obtained by treatment enters a front-arranged first-stage aerobic pool (1), a first-stage anoxic pool (2) and an anaerobic pool (3) respectively, biochemical treatment is carried out on the sewage in the front-arranged first-stage aerobic pool (1), the concentration of organic matters in the sewage is reduced, meanwhile, ammonia nitrogen in the sewage is converted into nitrate nitrogen, the concentration of the nitrate nitrogen is improved, and the reaction denitrification of the first-stage anoxic pool (2) is facilitated; the primary anoxic tank (2) mainly performs denitrification, and active sludge mixed liquor which automatically flows into the primary anoxic tank (1) from the front primary aerobic tank has nitrate nitrogen with higher concentration; the anaerobic tank (3) mainly removes phosphorus, the activated sludge releases phosphorus in an anaerobic environment, and when the activated sludge is treated in an aerobic state again, more phosphorus can be absorbed, so that the biological phosphorus removal efficiency is improved;
step two, the activated sludge mixed liquor obtained by treatment in the primary aerobic tank (1), the primary anoxic tank (2) and the anaerobic tank (3) which are arranged in the step one is automatically flowed to a secondary aerobic tank (4), then organic matters are removed from the activated sludge mixed liquor, the concentration of the organic matters is reduced to the minimum, and then the activated sludge mixed liquor is automatically flowed to a secondary anoxic tank (5);
step three, enabling the activated sludge mixed liquor treated in the step two to automatically flow into a secondary anoxic tank (5) for denitrification reaction, reducing the total nitrogen concentration of effluent, enabling nitrate nitrogen to fully react in the secondary anoxic tank (5) to become nitrogen under the action of an external carbon source, enabling a part of activated sludge mixed liquor to enter an MBR membrane tank (6), and enabling the other part of activated sludge mixed liquor to flow back to an anaerobic tank (3) through a reflux pump;
and step four, removing organic matters from the activated sludge mixed liquor which automatically flows to the MBR membrane tank (6) in the step four, filtering by a membrane module, separating clear water which reaches the standard, outputting the clear water to a system, continuously recycling the residual nitrified liquid, returning the residual nitrified liquid to the preposed first-stage aerobic tank (1) by a return pump, fully utilizing the residual oxygen in the MBR membrane tank (6), supplementing a proper amount of air to meet the dissolved oxygen requirement of biochemical reaction in the preposed first-stage aerobic tank (1), and discharging a part of sludge to a sludge tank from a sludge port.
2. The OAAOA-MBR wastewater treatment process based on enhanced endogenous denitrification and energy conservation of claim 1, characterized in that: in the third step, the second-stage anoxic tank (5) is low in organic matter content, the denitrification efficiency is often influenced, an organic carbon source is supplemented in the second-stage anoxic tank (5), the denitrification reaction is promoted, and the total nitrogen concentration of effluent is reduced.
3. The OAAOA-MBR wastewater treatment process based on enhanced endogenous denitrification and energy conservation of claim 1, characterized in that: the carbon source in the third step is sodium acetate.
4. The OAAOA-MBR wastewater treatment process based on enhanced endogenous denitrification and energy conservation of claim 1, characterized in that: in the fourth step, the concentration range of suspended solid of MBR mixed solution in the MBR membrane tank (6) is 10-20 g MLSS/L of flat membrane.
5. The OAAOA-MBR wastewater treatment process based on enhanced endogenous denitrification and energy conservation of claim 1, characterized in that: and in the fourth step, the nitrified liquid flows back to the front first-stage aerobic tank (1) from the MBR membrane tank (6) through a reflux pump, and the reflux amount is generally 4-6 times.
6. The OAAOA-MBR wastewater treatment process based on enhanced endogenous denitrification and energy conservation of claim 1, characterized in that: in the fourth step, in the MBR membrane tank (6), the membrane bioreactor is an immersed membrane bioreactor.
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| CN202010606202.6A CN111777180A (en) | 2020-06-29 | 2020-06-29 | OAAOA-MBR sewage treatment process based on enhanced endogenous denitrification and energy conservation |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117756339A (en) * | 2023-12-29 | 2024-03-26 | 中交苏伊士泰兴环境投资有限公司 | Sewage treatment denitrification biological dephosphorization method and device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117756339A (en) * | 2023-12-29 | 2024-03-26 | 中交苏伊士泰兴环境投资有限公司 | Sewage treatment denitrification biological dephosphorization method and device |
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