CN102249412B - Multistage anoxic and anaerobic circulation tail section anoxic activated sludge treatment process and system - Google Patents

Abstract

A process and system for treating anoxic activated sludge at the end of a multi-stage anoxic-anaerobic cycle, which alternately connects multiple aerobic pools and multiple anoxic pools, and each anoxic pool is connected to an anaerobic pool to form A plurality of combinations consisting of an aerobic tank, a subsequent anoxic tank connected to the aerobic tank, and an anaerobic tank connected to the latter anoxic tank, and then the sewage is diverted into the anaerobic tanks of each combination at the same time, each A combined aerobic tank flows out of the mud-water mixture into the combined anoxic tank, and the sewage entering the anaerobic tank is mixed with the mud-water mixed solution that enters the anaerobic tank from the combined anoxic tank, and is mixed in the combined anaerobic tank. The circulation between the pool and the anoxic tank, the mud-water mixture flowing out of each combination of anoxic tanks enters the next combination of aerobic tanks, and the mixed solution flowing out of the last combination of anoxic tanks 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 sources. It better solves the problem of urban sewage that is difficult to achieve efficient phosphorus and nitrogen removal due to low carbon sources and imbalanced ratios of carbon, nitrogen, and phosphorus. processing problem.

Description

A multi-stage anoxic anaerobic cycle tail anoxic activated sludge treatment process and system

technical field

The invention relates to an anoxic activated sludge treatment process and a treatment system at the tail section of a multistage anoxic anaerobic cycle, which is especially suitable for the treatment of low-carbon source urban domestic sewage.

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 the present invention is to overcome the deficiencies in the prior art, to provide a multi-stage anoxic anaerobic cycle tail section anoxic activated sludge treatment process with simple process, low energy consumption and low cost and processing system.

Technical solution: The anoxic activated sludge treatment process at the end of the multi-stage anoxic anaerobic cycle of the present invention includes aerobic, anoxic and anaerobic biological treatment, and the secondary sedimentation tank is used for sedimentation, and the supernatant is discharged from the sedimentation, and at the same time Return part of the sludge, and the treatment steps are as follows:

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

b. Separate the sewage into the anaerobic tanks of each combination at the same time, and the mud-water mixture flowing out of each combination of aerobic tanks enters the anoxic tank of the combination, and the sewage entering the anaerobic tank enters the anaerobic tank from the anoxic tank of the combination The mud-water mixture is mixed and circulated between the anaerobic tank and the anoxic tank of this combination. The mud-water mixture flowing out of each combination of anoxic tanks enters the next combination of aerobic tanks, and the last combination of anoxic tanks flows out The mixed solution enters the secondary sedimentation tank.

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

The present invention realizes the treatment system of the anoxic activated sludge process at the end of multi-stage anoxic anaerobic cycle, including multiple aerobic pools, multiple anoxic pools, multiple anaerobic pools and a secondary sedimentation tank. One aerobic pool and multiple anoxic pools are alternately connected in the form of aerobic pool, anoxic pool, aerobic pool, and anoxic pool. Each anoxic pool is connected to an anaerobic pool, and each anaerobic pool is connected to an anaerobic pool. The sewage pipe is connected, and the return pipe of the secondary settling tank is connected to the first aerobic tank.

Beneficial effects: the present invention combines the wastewater biological treatment method to make full use of limited carbon sources, improves the utilization rate of carbon sources in wastewater treatment, effectively solves the problem of insufficient carbon sources in wastewater 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 Combine two independent processes with excess phosphorus absorption into one, one carbon with two uses. By making the activated sludge pass through the anaerobic, anoxic and aerobic environments alternately, various microorganisms can alternately enter the growth environment that is beneficial to themselves, so that the microorganisms will not be inhibited by being in a growth environment that is unfavorable to themselves for a long time, which is beneficial to all kinds of microorganisms. Microorganisms maintain high biological activity. All the return sludge from the secondary settling tank enters the aerobic tank, which is conducive to recovering the activity of aerobic microorganisms as soon as possible. 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

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

Detailed ways

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

The anoxic activated sludge treatment process at the tail section of the multi-stage anoxic anaerobic cycle of the present invention alternately connects a plurality of aerobic pools and a plurality of anoxic pools, and each anoxic pool is connected with an anaerobic pool to form multiple A combination consisting of an aerobic pool, a subsequent anoxic pool connected to the aerobic pool, and an anaerobic pool connected to the latter anoxic pool, the number of the combination is 2 to 30. Divide sewage into multiple combined anaerobic tanks at the same time, and the mud-water mixture from each combined aerobic tank enters the combined anoxic tank, and the sewage entering the anaerobic tank enters the anaerobic tank from the combined anoxic tank The mud-water mixture of the pool is mixed, the anaerobic pool and the anoxic pool are built together or separately, and the anoxic pool and the aerobic pool are built together or separately. Cycle between a combined anaerobic tank and anoxic tank, the mud-water mixture flowing out of each combined anoxic tank enters the next combined aerobic tank, and the mixed liquid flowing out of the last combined anoxic tank enters the secondary sedimentation tank , solid-liquid separation in the secondary settling tank, discharge the supernatant, return the sludge into the first aerobic tank, and regularly discharge the remaining sludge.

The treatment system for realizing the anoxic activated sludge process at the tail section of the multistage anoxic anaerobic cycle of the present invention is mainly composed of multiple aerobic pools, anoxic pools, multiple anaerobic pools and a secondary sedimentation tank. It can be built together with the anoxic pool or separately, and the anoxic pool and the aerobic pool can be built together or separately. Multiple aerobic pools and multiple anoxic pools are alternately connected in the form of aerobic pools, anoxic pools, aerobic pools, and anoxic pools. Each anoxic pool is connected to an anaerobic pool. It is connected with the sewage pipe, and the return pipe of the secondary sedimentation tank is connected with the first aerobic tank.

Claims (1)

1. A multi-stage anoxic anaerobic cycle tail section anoxic activated sludge treatment process, including aerobic, anoxic and anaerobic biological treatment, and sedimentation in the secondary sedimentation tank, the supernatant is discharged from the sedimentation, and simultaneously Part of the sludge backflow is characterized in that the treatment steps are as follows: a. A plurality of aerobic pools and a plurality of anoxic pools are alternately connected, and each anoxic pool is connected with an anaerobic pool to form a plurality of aerobic pools, the latter anoxic pools connected with the aerobic pool, and a combination of anaerobic tanks connected to the latter anoxic tank; b. Separate the sewage into the anaerobic tanks of each combination at the same time, and the mud-water mixture flowing out of each combination of aerobic tanks enters the anoxic tank of the combination, and the sewage entering the anaerobic tank enters the anaerobic tank from the anoxic tank of the combination The mud-water mixture is mixed and circulated between the anaerobic tank and the anoxic tank of this combination. The mud-water mixture flowing out of each combination of anoxic tanks enters the next combination of aerobic tanks, and the last combination of anoxic tanks flows out The mixed solution enters the secondary sedimentation tank. 2. The multi-stage anoxic anaerobic cycle tail section anoxic activated sludge treatment process according to claim 1, characterized in that: the plurality of aerobic pools communicated with the aerobic pools The number of combinations of the anoxic pool and the anaerobic pool connected to the latter anoxic pool is 2 to 30. 3. The anoxic activated sludge treatment process at the tail end of the multi-stage anoxic anaerobic cycle according to claim 1, characterized in that: the anaerobic pool and the anoxic pool are built jointly or separately. 4. The anoxic activated sludge treatment process at the tail end of the multi-stage anoxic anaerobic cycle according to claim 1, characterized in that: the anoxic pool and the aerobic pool are built together or separately. 5. A system for realizing the anoxic activated sludge treatment process at the end of multistage anoxic anaerobic cycle, including multiple aerobic tanks, multiple anoxic tanks, multiple anaerobic tanks and a secondary sedimentation tank, its characteristics In that: the anaerobic pool and the anoxic pool are built together or separately, and the anoxic pool and the aerobic pool are built together or separately; multiple aerobic pools, multiple anoxic pools, aerobic pools, anoxic pools , aerobic pools, and anoxic pools are connected alternately, and each anoxic pool is connected to an anaerobic pool to form multiple aerobic pools, an anoxic pool connected to an aerobic pool, and an anoxic pool connected to an anoxic pool. The combination of anaerobic tanks connected with oxygen tanks, each anaerobic tank is connected to the sewage pipe, the return pipe of the secondary settling tank is connected to the first aerobic tank, and the last anoxic tank is connected to the secondary settling tank, and the sewage is diverted and enters at the same time Multiple combined anaerobic tanks, each combined aerobic tank flows out the mud-water mixture into the anoxic tank of the combination, and the sewage entering the anaerobic tank is mixed with the mud-water mixture entering the anaerobic tank from the anoxic tank of the combination Mixing, circulation between a combined anoxic tank and anoxic tank, the mud-water mixture flowing out of each combined anoxic tank enters the next combined aerobic tank, and the mixed liquid flowing out of the last combined anoxic tank enters the second Settling tank, solid-liquid separation in the secondary settling tank, discharge the supernatant, return the sludge into the first aerobic tank, and regularly discharge the remaining sludge.

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