CN102276062A - Multistage anaerobic and anoxic circulating final segment aerobic activated sludge process - Google Patents

Abstract

An aerobic activated sludge process at the end of a multi-stage anaerobic-anoxic cycle, which alternately connects a plurality of anoxic pools and aerobic pools, and each anoxic pool is connected to an anaerobic pool. The latter anaerobic pond connected to the anoxic pond forms a combination with the aerobic pond connected to the anoxic pond, and then the sewage is shunted into the anaerobic pond and the secondary sedimentation pond of each combination at the same time, and the sewage entering the anaerobic pond is combined with the secondary sedimentation pond. The mud-water mixture entering the anaerobic pool from the anoxic pool of this combination is mixed, and circulates between the anaerobic pool and the anoxic pool of this combination, and the mud-water mixture flowing out of the anoxic pool of each combination enters the aerobic pool of this combination The mud-water mixture flowing out of the aerobic tank enters the next combined anoxic tank, and the mud-water mixture flowing out of the last combined aerobic tank enters the secondary sedimentation tank. It is most suitable for urban domestic sewage treatment. It has the advantages of saving aeration and requiring less carbon source. It better solves the urban sewage that is difficult to achieve efficient phosphorus and nitrogen removal due to low carbon source and imbalance of carbon, nitrogen and phosphorus ratio. processing problem.

Description

A kind of aerobic activated sludge process at the end of multi-stage anaerobic-anoxic cycle

technical field

The invention relates to a biological phosphorus and nitrogen removal process, in particular to an aerobic activated sludge process at the end of a multi-stage anaerobic-anoxic cycle suitable for low-carbon source urban domestic sewage treatment.

Background technique

In recent years, the problems of water environment pollution and water eutrophication have become increasingly serious. Nitrogen and phosphorus are the main factors causing water eutrophication. With the improvement of public environmental awareness and stricter restrictions on nitrogen and phosphorus discharge at home and abroad, research and development of economical and efficient sewage treatment technologies for nitrogen and phosphorus removal, especially wastewater biological phosphorus and nitrogen removal technology has always been an important issue. Hotspots in the field of water pollution control engineering.

Contents of the invention

Technical problem: The purpose of this invention is to overcome the deficiencies in the prior art and provide a multi-stage aerobic activated sludge process at the end of anaerobic anoxic cycle with simple process, low energy consumption and low cost.

Technical solution: The aerobic activated sludge process at the end of the multi-stage anaerobic-anoxic cycle of the present invention includes anoxic, anaerobic and aerobic biological treatment, and sedimentation, the supernatant is discharged from the sedimentation, and part of the sludge is Backflow, the processing steps are as follows:

a. A plurality of anoxic pools and a plurality of aerobic pools are alternately connected, and each anoxic pool is connected with an anaerobic pool to form a plurality of anoxic pools, the latter anaerobic pools connected with the anoxic pool and a combination of aerobic tanks connected to the anoxic tank;

b. Separate the sewage into the anaerobic tank and the secondary sedimentation tank of each combination at the same time, the sewage entering the anaerobic tank is mixed with the mud-water mixture entering the anaerobic tank from the anoxic tank of this combination, and the anaerobic tank and the anaerobic tank of this combination are mixed. Circulation between oxygen pools, the mud-water mixture flowing out of each combination of anoxic pools enters the aerobic pool of this combination, the mud-water mixture flowing out of each combination of aerobic pools enters the next combination of anoxic pools, and the last combination is good The mixed liquor flowing out of the oxygen tank enters the secondary sedimentation tank.

The number of the combination consisting of an anoxic pool, an anaerobic pool connected to the anoxic pool and an aerobic pool connected to the anoxic pool is 2 to 30; the anoxic pool Built together or separately with anaerobic pool; said anoxic pool and aerobic pool are built together or separately.

Beneficial effects: the present invention combines the waste water biological treatment method, fully utilizes the limited carbon source, improves the utilization rate of the carbon source in the waste water treatment, effectively solves the problem of insufficient carbon source in the waste water biological phosphorus removal, and greatly improves The sludge concentration of the system. The sewage directly enters the anaerobic tank, and the limited carbon source is preferentially supplied to the phosphorus accumulating bacteria; the mud-water mixture circulates between the anaerobic tank and the anoxic tank, which is conducive to the formation of denitrification and phosphorus removal under anoxic conditions, and the denitrification and denitrification The two independent processes of absorbing phosphorus and absorbing phosphorus are combined into one, and one carbon is used for two purposes. The sewage diverted into the secondary settling tank enters the secondary settling tank together with the mud-water mixture flowing out of the last aerobic tank. During the mud-water separation process, the denitrification reaction is continued to reduce the nitrite nitrogen and nitrite nitrogen in the return sludge and effluent water. Nitrate nitrogen. The invention has the advantages of saving aeration amount, requiring less carbon source, etc., and can better solve the problem of urban sewage treatment that is difficult to achieve high-efficiency phosphorus and nitrogen removal due to low carbon source and imbalanced ratio of carbon, nitrogen and phosphorus.

Description of drawings

Figure 1 is a process flow diagram of the present invention.

Detailed ways

Embodiments of the present invention will be further described below in conjunction with the accompanying drawings:

The aerobic activated sludge process at the end of the multi-stage anaerobic anoxic cycle of the present invention mainly performs anoxic, anaerobic and aerobic biological treatment through the anoxic tank, anaerobic tank and aerobic tank, and then settles through the secondary sedimentation tank , the supernatant is discharged during the sedimentation, and part of the sludge is refluxed at the same time. The anaerobic tank and the anoxic tank can be built together or separately, and the anoxic tank and the aerobic tank can be built together or separately. First connect multiple anoxic pools and multiple aerobic pools alternately, and each anoxic pool is connected to an anaerobic pool to form multiple anaerobic pools connected by one anoxic pool and the anoxic pool Combination with the aerobic pool connected to the anoxic pool; the number of combinations consisting of an anoxic pool, the next anaerobic pool connected to the anoxic pool, and an aerobic pool connected to the anoxic pool 2 to 30 pieces. Separate the sewage into the anaerobic tank and the secondary sedimentation tank of each combination at the same time, the sewage entering the anaerobic tank is mixed with the mud-water mixture entering the anaerobic tank from the anoxic tank of this combination, and the anaerobic tank and the anaerobic tank of this combination are mixed. Circulation between oxygen pools, the mud-water mixture flowing out of each combination of anoxic pools enters the aerobic pool of this combination, the mud-water mixture flowing out of each combination of aerobic pools enters the next combination of anoxic pools, and the last combination is good The mixed liquor flowing out of the oxygen tank enters the secondary settling tank, where the solid and liquid are separated, the supernatant is discharged, and the return sludge enters the first anoxic tank, and the remaining sludge is discharged regularly.

Claims (4)

1. An aerobic activated sludge process at the end of a multi-stage anaerobic-anoxic cycle, including anoxic, anaerobic and aerobic biological treatment, and sedimentation, the supernatant is discharged from the sedimentation, and part of the sludge is refluxed at the same time, It is characterized in that the processing steps are as follows: a. A plurality of anoxic pools and a plurality of aerobic pools are alternately connected, and each anoxic pool is connected with an anaerobic pool to form a plurality of anoxic pools, the latter anaerobic pools connected with the anoxic pool and a combination of aerobic tanks connected to the anoxic tank; b. Separate the sewage into the anaerobic tank and the secondary sedimentation tank of each combination at the same time, the sewage entering the anaerobic tank is mixed with the mud-water mixture entering the anaerobic tank from the anoxic tank of this combination, and the anaerobic tank and the anaerobic tank of this combination are mixed. Circulation between oxygen pools, the mud-water mixture flowing out of each combination of anoxic pools enters the aerobic pool of this combination, the mud-water mixture flowing out of each combination of aerobic pools enters the next combination of anoxic pools, and the last combination is good The mixed liquor flowing out of the oxygen tank enters the secondary sedimentation tank. 2. The aerobic activated sludge process at the end of the multistage anaerobic-anoxic cycle according to claim 1, characterized in that: the anaerobic pond communicated with the latter anaerobic pond by an anoxic pond The number of combinations with the aerobic pool connected to the anoxic pool is 2 to 30. 3. The aerobic activated sludge process at the tail end of the multi-stage anaerobic-anoxic cycle according to claim 1, characterized in that: the anoxic pool and the anaerobic pool are built jointly or separately. 4. The aerobic activated sludge process at the tail end of the multi-stage anaerobic-anoxic cycle according to claim 1, characterized in that: the anoxic pool and the aerobic pool are built jointly or separately.

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