An AABMO sewage treatment system

Abstract

The present invention discloses an AABMO sewage treatment system, which is composed of an anaerobic zone, an anoxic zone, an aerobic zone and a sedimentation zone connected in sequence. The water inlet of the anaerobic zone is connected to the water outlet of the grit chamber of the water plant, and the water outlet of the sedimentation zone is connected to the system water outlet unit. Activated sludge is provided in the anaerobic zone, anoxic zone, aerobic zone and sedimentation zone, and biomass filler membrane racks are laid flat at the bottoms of the anoxic zone and aerobic zone. Each group of biomass filler membrane racks is spliced by a plurality of modular biomass filler membrane rack single blocks. By adopting modular biomass fillers in the aerobic zone and anoxic zone, the biofilm formed on the fillers and the activated sludge jointly remove pollutants in the sewage. Compared with the prior art, the present invention can increase the total nitrogen removal rate by 13%, the total nitrogen in the effluent reaches at least 10 mg / L, increase the total phosphorus removal rate by 30%, the total phosphorus removal rate reaches 50%, the SS value of the effluent can reach 6 mg / L, and the effluent water quality reaches the standard of quasi-V type water.

Description

Technical Field

[0001] The present invention belongs to the field of municipal sewage treatment, and particularly relates to an AABMO sewage treatment system. Background Art

[0002] Nowadays, in the sewage treatment plant upgrading projects, the IFAS process is mostly used. This process is based on the principle of increasing the amount of microorganisms by the symbiosis of sludge and membrane to improve the pollutant removal rate, and currently, suspended packing is used as the carrier for microorganisms. There are the following two major defects in the operation of this process:

[0003] 1. It is necessary to re-plan the aeration system to meet certain hydraulic conditions so that the suspended packing is in a uniform and fluidized state;

[0004] 2. At the effluent end of the biochemical tank, it is necessary to design an anti-clogging system. Currently, the anti-clogging system consists of a grille and an aeration pipe. However, during the operation, the grille will be fouled with film, resulting in the phenomenon of grid holes being blocked.

[0005] The common point of the above two defects is that both require the transformation of the aeration system. In addition, currently, the effluent index of the water plant is required to meet the standard of surface water level IV. In the project of water quality upgrading of the above process system, although it has a good removal effect on ammonia nitrogen, it has almost no additional contribution to the removal of SS, total nitrogen, and total phosphorus. Therefore, there is a need for a water treatment process that can meet this standard without adding other treatment units. Summary of the Invention

[0006] In view of the problems existing in the prior art, the present invention proposes an AABMO sewage treatment system, which can improve the total nitrogen volume load, ammonia nitrogen volume load, and total phosphorus volume load of the anoxic section and aerobic section without increasing the volume of each treatment area, so that the effluent index reaches the standard of surface water level IV.

[0007] To achieve the above technical objectives and reach the above technical effects, the present invention is realized through the following technical solutions:

[0008] An AABMO (Anaeroxic - Anoxic - Biological - Membrane - Oxic) sewage treatment system, which is based on the A2O process (anaerobic - anoxic - aerobic method), consists of an anaerobic zone, an anoxic zone, an aerobic zone, and a sedimentation zone connected in sequence. The treatment object of this system is municipal sewage. The inlet of the anaerobic zone is connected to the outlet of the grit chamber of the water plant, the outlet of the sedimentation zone is connected to the system effluent unit of the sewage treatment system. Activated sludge is provided in the anaerobic zone, the anoxic zone, the aerobic zone, and the sedimentation zone. And a group of biomass filler membrane racks are laid flat at the bottom of the anoxic zone and the aerobic zone. Each group of biomass filler membrane racks is spliced by several modular biomass filler membrane rack single blocks with high specific surface area, high film - hanging performance, containing carbon source and strong adsorption performance. Each modular biomass filler membrane rack single block includes a cuboid - shaped main structure. End face bumps and end face grooves are respectively arranged on the front and rear end faces of the main structure, and the sizes of the end face bumps and the end face grooves correspond to each other. A number of side bumps are equidistantly arranged on the left and right side faces of the main structure. Side grooves are formed between two adjacent side bumps on the same side, and the sizes of the side bumps and the side grooves correspond to each other. A number of through - large round holes and small round holes are opened on the upper and lower planes of the main structure.

[0009] The AABMO sewage treatment system of the present invention is based on the A2O process, and by designing modular biomass fillers with high specific surface area, high film - hanging performance, containing carbon source, and strong adsorption performance in the anoxic section and the aerobic section, the purpose of sludge - film symbiosis is achieved, so that the biofilm formed on the fillers and the activated sludge jointly remove pollutants in the sewage.

[0010] The system characteristics of the AABMO sewage treatment system of the present invention are as follows:

[0011] 1. The influent is the water after municipal sewage passes through the grit chamber;

[0012] 2. The total hydraulic retention time of the AABMO sewage treatment system is 16 h. Among them, the hydraulic retention time of the anaerobic zone is 1.5 h, the hydraulic retention time of the anoxic zone is 3 h, the hydraulic retention time of the aerobic zone is 8.5 h, and the hydraulic retention time of the sedimentation zone is 3 h;

[0013] 3. The overall sludge concentration of the AABMO sewage treatment system is 3500 mg / L;

[0014] 4. The filling ratio of the modular biomass filler membrane rack single block in the anoxic zone is 3%, and the filling ratio of the modular biomass filler membrane rack single block in the aerobic zone is 5%.

[0015] 5. The volume of each group of the biomass filler membrane racks is 6.3 L, and the dimensions of length × width × thickness are 300 mm × 300 m × 300 mm. The volume of a single modular biomass filler membrane rack is 0.7 L, and the dimensions of length × width × thickness are 330 mm × 150 m × 35 mm;

[0016] 6. The dimensions of length × width × thickness of the anaerobic zone are 5.38 m × 2.1 m × 3.1 m, and the effective water depth is 2.5 m; the dimensions of length × width × thickness of the anoxic zone are 5.12 m × 2.1 m × 3.1 m, and the effective water depth is 2.5 m; the dimensions of length × width × thickness of the aerobic zone are 13.26 m × 2.0 m × 3.1 m, and the effective water depth is 2.5 m.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0018] 1. The present invention adopts modular biomass fillers with a high specific surface area, high biofilm attachment performance, containing carbon sources, and strong adsorption performance, thereby achieving the purpose of sludge-film symbiosis, and enabling the biofilm formed on the fillers and the activated sludge to jointly remove pollutants in the sewage. Compared with the prior art using suspended fillers, the present invention can increase the total nitrogen removal rate by 13%, the effluent total nitrogen reaches at least 10 mg / L, increase the total phosphorus removal rate by 30%, the total phosphorus removal rate reaches 50%, the effluent SS value can reach 6 mg / L, and the effluent water quality reaches the quasi-fifth-class water standard (except total nitrogen and total phosphorus).

[0019] 2. The present invention combines the A2O process with modular biomass fillers. The system does not need to improve the aeration system, nor does it need to design an anti-blocking system. It not only has a short construction period, but also can increase the total nitrogen volume load, ammonia nitrogen volume load, and total phosphorus volume load in the anoxic section and aerobic section without increasing the volume of each treatment area, so that the effluent index reaches the fourth-class water standard of surface water level.

[0020] 3. The contribution of the present invention to the removal of total nitrogen can reduce the dosage of carbon sources in the water plant, and the contribution to the removal of total phosphorus can reduce the dosage of phosphorus removal agents in the water plant, saving production costs.

[0021] The above description is only an overview of the technical solution of the present invention. In order to be able to understand the technical means of the present invention more clearly and implement it according to the content of the specification, the following takes the preferred embodiments of the present invention and combines with the drawings to describe in detail as follows. The specific implementation manners of the present invention are given in detail by the following embodiments and their drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings described herein are used to provide a further understanding of the present invention, and constitute a part of this application. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0023] Figure 1 It is the structural block diagram of the AABMO sewage treatment system of the present invention.

[0024] Figure 2 It is the structural schematic diagram of a single modular biomass filler membrane rack of the AABMO sewage treatment system of the present invention. Specific embodiments

[0025] The present invention will be described in detail below with reference to the drawings and in conjunction with embodiments.

[0026] See Figure 1 As shown, an AABMO sewage treatment system is based on the A2O process (anaerobic - anoxic - aerobic method) and consists of an anaerobic zone (1), an anoxic zone (2), an aerobic zone (3), and a sedimentation zone (4) connected in sequence. The treatment object of this system is municipal sewage. The inlet of the anaerobic zone (1) is connected to the outlet of the grit chamber of the waterworks. The outlet of the sedimentation zone (4) is connected to the system outlet unit of the sewage treatment system. Activated sludge is provided in the anaerobic zone (1), the anoxic zone (2), the aerobic zone (3), and the sedimentation zone (4). And a group of biomass filler membrane racks (5) are laid flat at the bottom of the anoxic zone (2) and the aerobic zone (3). Each group of biomass filler membrane racks (5) is composed of several modular biomass filler membrane rack single blocks (6) with a high specific surface area, high film - hanging performance, containing carbon sources and strong adsorption performance. Each modular biomass filler membrane rack single block (6) includes a cuboid - shaped main structure (601). End face bumps (602) and end face grooves (603) are respectively provided on the front and rear end faces of the main structure (601), and the sizes of the end face bumps (602) and the end face grooves (603) correspond to each other. A number of side bumps (604) are equidistantly arranged on the left and right side faces of the main structure (601). Side grooves (605) are formed between two adjacent side bumps (604) on the same side, and the sizes of the side bumps (604) and the side grooves (605) correspond to each other. A number of through - large round holes (606) and small round holes (607) are opened on the upper and lower planes of the main structure (601).

[0027] Further, the total hydraulic retention time of the AABMO sewage treatment system is 16 h.

[0028] Further, the hydraulic retention time of the anaerobic zone (1) is 1.5 h, the hydraulic retention time of the anoxic zone (2) is 3 h, the hydraulic retention time of the aerobic zone (3) is 8.5 h, and the hydraulic retention time of the sedimentation zone (4) is 3 h.

[0029] Furthermore, the overall sludge concentration of the AABMO sewage treatment system is 3,500 mg / L.

[0030] Furthermore, the filling ratio of each single modular biomass filler membrane rack (6) in the anoxic zone (2) is 3%.

[0031] Furthermore, the filling ratio of each single modular biomass filler membrane rack (6) in the aerobic zone (3) is 5%.

[0032] Furthermore, the volume of each single modular biomass filler membrane rack (6) is 0.7 L, and its dimensions of length × width × thickness are 330 mm × 150 m × 35 mm;

[0033] Furthermore, the volume of each group of biomass filler membrane racks (5) is 6.3 L, and its dimensions of length × width × thickness are 300 mm × 300 m × 300 mm.

[0034] Furthermore, the dimensions of the anaerobic zone (1) in terms of length × width × thickness are 5.38 m × 2.1 m × 3.1 m, and the effective water depth is 2.5 m.

[0035] Furthermore, the dimensions of the anoxic zone (2) in terms of length × width × thickness are 5.12 m × 2.1 m × 3.1 m, and the effective water depth is 2.5 m.

[0036] Furthermore, the dimensions of the aerobic zone (3) in terms of length × width × thickness are 13.26 m × 2.0 m × 3.1 m, and the effective water depth is 2.5 m.

[0037] The AABMO sewage treatment system of the present invention is based on the A2O process, and by designing modular biomass fillers with high specific surface area, high film-forming performance, containing carbon sources, and strong adsorption performance in the anoxic section and aerobic section, the purpose of sludge-film symbiosis is achieved, so that the biofilm formed on the fillers and the activated sludge jointly remove pollutants in the sewage.

[0038] The following is a running test to verify the running effect of the AABMO sewage treatment system of the present invention:

[0039] The influent is the effluent from the grit chamber of a sewage treatment plant, and the influent indexes are COD = 400 mg / L, BOD 5 = 155 mg / L, SS = 230 mg / L, ammonia nitrogen = 40 mg / L, total nitrogen = 53 mg / L, total phosphorus = 8 mg / L.

[0040] The designed treatment scale of the AABMO sewage treatment system of the present invention is 200 tons per day. After 6 months of operation, the effluent quality of the system of the present invention can be stabilized at: COD ≤ 40 mg / L, BOD5 ≤ 10 mg / L, SS ≤ 10 mg / L (the lowest can reach 6 mg / L), ammonia nitrogen ≤ 2 mg / L, total nitrogen ≤ 10 mg / L, total phosphorus ≤ 4 mg / L. It can be seen therefrom that the effluent quality of the system of the present invention basically meets the standard of the fourth-class surface water (except for total nitrogen and total phosphorus).

[0041] And the effluent quality of the A2O tank of the current water plant is: COD ≤ 50 mg / L, BOD 5 ≤ 10 mg / L, SS ≤ 20 mg / L, ammonia nitrogen ≤ 5 mg / L, total nitrogen ≤ 15 mg / L, total phosphorus ≤ 6 mg / L. It can be seen therefrom that compared with the effluent of the A2O tank of the water plant, the removal rate of total nitrogen of the system of the present invention has increased by 13%, the removal rate of total phosphorus has increased by 30%, and the effluent SS has reached the discharge standard of Class A of Grade 1 in GB18918-2002.

[0042] In summary, the advantages of the system of the present invention are summarized as follows: 1. The effluent of the system of the present invention can meet the standard of the fourth-class surface water; 2. The contribution to the removal of total nitrogen can reduce the dosage of carbon source in the water plant; 3. The contribution to the removal of total phosphorus can reduce the dosage of phosphorus removal agent in the water plant (for a water plant with a scale of 10,000 tons per day, the amount of ferrous sulfate can be reduced by 134 kg / d, and the amount of aluminum chloride can be reduced by 62 kg / d).

[0043] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A AABMO sewage treatment system, characterized in that: Based on A 2 O process, and is composed of an anaerobic zone (1), an anoxic zone (2), an aerobic zone (3) and a sedimentation zone (4) connected in sequence; the water inlet of the anaerobic zone (1) is connected to the water outlet of the grit chamber of the water plant, the water outlet of the sedimentation zone (4) is connected to the system water outlet unit of the sewage treatment system, activated sludge is provided in the anaerobic zone (1), the anoxic zone (2), the aerobic zone (3) and the sedimentation zone (4), and a group of biomass filler membrane racks (5) are laid flat at the bottoms of the anoxic zone (2) and the aerobic zone (3). Each group of the biomass filler membrane racks (5) is spliced by a number of modular biomass filler membrane rack single blocks (6) with a high specific surface area, high film hanging performance, containing a carbon source and strong adsorption performance. Each modular biomass filler membrane rack single block (6) includes a cuboid main structure (601). End face bumps (602) and end face grooves (603) are respectively arranged on the front and rear end faces of the main structure (601), and the sizes of the end face bumps (602) and the end face grooves (603) correspond to each other. A number of side bumps (604) are equidistantly arranged on the left and right side faces of the main structure (601), and side grooves (605) are formed between two adjacent side bumps (604) on the same side, and the sizes of the side bumps (604) and the side grooves (605) correspond to each other. A number of through large round holes (606) and small round holes (607) are formed on the upper and lower planes of the main structure (601); the filling ratio of each single modular biomass filler membrane rack (6) in the anoxic zone (2) is 3%; the filling ratio of each single modular biomass filler membrane rack (6) in the aerobic zone (3) is 5%; the volume of each single modular biomass filler membrane rack (6) is 0.7 L; the volume of each group of biomass filler membrane racks (5) is 6.3 L.

2. The AABMO sewage treatment system according to claim 1, characterized in that: the total hydraulic retention time of the anaerobic zone (1), the anoxic zone (2), the aerobic zone (3) and the sedimentation zone (4) is 16 h.

3. The AABMO sewage treatment system according to claim 2, characterized in that: the hydraulic retention time of the anaerobic zone (1) is 1.5 h, the hydraulic retention time of the anoxic zone (2) is 3 h, the hydraulic retention time of the aerobic zone (3) is 8.5 h, and the hydraulic retention time of the sedimentation zone (4) is 3 h.

4. The AABMO sewage treatment system according to claim 1, characterized in that: the sludge concentration of the activated sludge in the anaerobic zone (1), the anoxic zone (2), the aerobic zone (3) and the sedimentation zone (4) is 3500 mg / L.

5. The AABMO sewage treatment system according to claim 1, characterized in that: the size of the anaerobic zone (1) in length × width × height is 5.38 m × 2.1 m × 3.1 m, the size of the anoxic zone (2) in length × width × height is 5.12 m × 2.1 m × 3.1 m, and the size of the aerobic zone (3) in length × width × height is 13.26 m × 2.0 m × 3.1 m.

6. The AABMO sewage treatment system according to claim 5, characterized in that: the effective water depth of the anaerobic zone (1), the anoxic zone (2) and the aerobic zone (3) is 2.5 m.

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