Three-dimensional AAO sewage treatment reactor

Abstract

The invention relates to the technical field of sewage treatment, and discloses a three-dimensional AAO sewage treatment reactor which comprises a reactor tank body, a gas stripping water tank is arranged at the top of the reactor tank body, and a settling zone is arranged on the outer side of the reactor tank body; a first partition plate and a second partition plate are sequentially and fixedly connected to the interior of the reactor tank body, partition plate overflowing holes are formed in the first partition plate and the second partition plate respectively, and the interior of the reactor tank body is divided into an anaerobic zone, an anoxic zone and an aerobic zone through the first partition plate and the second partition plate from bottom to top respectively; a wastewater lifting pump is arranged on the outer side of the reactor tank body, and a reactor water inlet pipe is arranged at one end of the wastewater lifting pump. According to the three-dimensional AAO sewage treatment reactor, the anaerobic zone, the anoxic zone and the aerobic zone are vertically arranged, the occupied area can be saved, mixed liquid backflow and sludge backflow can form gravity flow through the mixed liquid backflow pipe and the sludge discharge pipe, and the energy consumption is low.

Description

Technical Field

[0001] The invention relates to the technical field of sewage treatment, and in particular to a three-dimensional AAO sewage treatment reactor. Background Art

[0002] AAO process (Anaerobic-Anoxic-Oxic) is a biological denitrification and phosphorus removal process widely used in urban domestic sewage treatment and industrial wastewater treatment. This process simulates the metabolic process of microorganisms under different environmental conditions to effectively remove pollutants such as organic matter, ammonia nitrogen, nitrate nitrogen and phosphate in sewage.

[0003] In the treatment of domestic sewage, AAO is a commonly used process, which is generally arranged horizontally. The existing technology requires a mixed liquid return pump and a sludge return pump, which has the disadvantage of occupying a large area.

[0004] In view of the defects and shortcomings of the existing technology, a three-dimensional AAO sewage treatment reactor with a small footprint is provided for small-volume sewage. Summary of the invention

[0005] The purpose of the present invention is to provide a three-dimensional AAO sewage treatment reactor to solve the problems raised in the above background technology.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: a three-dimensional AAO sewage treatment reactor, comprising a reactor tank, a gas lift water tank is arranged on the top of the reactor tank, and a sedimentation area is arranged on the outside of the reactor tank;

[0007] The inside of the reactor tank is fixedly connected with a first partition and a second partition in sequence, and the tops of the first partition and the second partition are respectively provided with partition flow holes. The inside of the reactor tank is divided into an anaerobic zone, an anoxic zone and an aerobic zone from bottom to top by the first partition and the second partition. A wastewater lifting pump is arranged on the outside of the reactor tank, and a reactor water inlet pipe is arranged at one end of the wastewater lifting pump;

[0008] A mixed liquid reflux pipe is installed on the outside of the air lift water tank, an air lift pipe is installed at the bottom of the air lift water tank, an air lift branch pipe is installed at one end of the air lift pipe, a first air valve is arranged on the air lift branch pipe, an air main pipe is installed at one end of the air lift branch pipe away from the air lift pipe, a fan is installed at one end of the air main pipe away from the air lift branch pipe, and water inlet pipes for the sedimentation area are installed at both ends of the air lift water tank;

[0009] An inclined pipe is arranged inside the sedimentation zone, a mud discharge pipe is installed at the bottom of the sedimentation zone, and a water collecting tank is opened outside the sedimentation zone.

[0010] Preferably, an aerobic zone level gauge is installed on the top of the reactor tank, a sedimentation zone level gauge is installed on the top of the sedimentation zone, and an air lift water tank level gauge is installed on the top of the air lift water tank.

[0011] Preferably, one end of the reactor water inlet pipe away from the wastewater lift pump is connected to the anaerobic zone inside the reactor water inlet pipe, and the bottom of the air stripping pipe penetrates the reactor tank and extends to the inside of the aerobic zone.

[0012] Preferably, a plurality of the mud discharge pipes are provided, and the plurality of the mud discharge pipes are distributed in a ring array.

[0013] Preferably, one end of a plurality of the sludge discharge pipes away from the sedimentation zone is respectively connected to the anaerobic zone of the reactor tank, and a sludge return valve is respectively installed on the plurality of the sludge discharge pipes.

[0014] Preferably, the bottom of the mixed liquor reflux pipe passes through the reactor tank and extends to the interior of the anoxic zone, a plurality of water inlet pipes of the sedimentation zone are provided, and the plurality of water inlet pipes of the sedimentation zone are respectively connected to the sedimentation zone, and a plurality of mixed liquor reflux pipes are respectively provided with mixed liquor reflux valves.

[0015] Preferably, a plurality of the partition plate flow holes are provided, and the plurality of the partition plate flow holes are distributed in a ring array.

[0016] Preferably, an oxygen supply branch pipe is installed at the bottom of the air main pipe, and an aeration disk is installed at the top of the second partition plate located in the aerobic zone.

[0017] Preferably, a second air valve is installed on the oxygen supply branch pipe, and one end of the oxygen supply branch pipe away from the air main pipe is connected to the aeration disk by penetrating the reactor tank.

[0018] Compared with the prior art, the beneficial effects achieved by the present invention are:

[0019] First, in the present invention, the reactor tank body is the main part of the entire sewage treatment system, and the interior is divided into three main areas, namely, an anaerobic zone, an anoxic zone and an aerobic zone, by a first partition and a second partition. The first partition and the second partition divide the internal space of the reactor tank body into different treatment areas to ensure that the water flows along a preset path and enhances the treatment effect. The flow holes of the partitions are provided to facilitate the passage of water. The anaerobic zone is located at the bottom and is mainly used for the preliminary decomposition of organic matter. The organic matter is converted into volatile fatty acids and other simple compounds by the action of anaerobic microorganisms. The anoxic zone is located in the middle and is used to further decompose the organic matter, and denitrification is carried out in the process to reduce nitrates to nitrogen. The aerobic zone is located at the top and provides sufficient oxygen through aeration to promote the growth of aerobic microorganisms and further decompose organic matter. The wastewater lifting pump sends the sewage into the anaerobic zone in the reactor tank body through the reactor inlet pipe. The anaerobic zone, the anoxic zone and the aerobic zone are arranged vertically to save space.

[0020] Second, in the present invention, the air lift water tank is installed on the top of the reactor tank body, the air lift pipe is used to lift the mixed liquid into the air lift water tank, a part of the mixed liquid is returned to the anoxic zone by gravity through the mixed liquid return pipe for denitrification, and the other part flows into the sedimentation zone by gravity through the sedimentation zone water inlet pipe, and a first air valve is provided on the air lift branch pipe to control the gas flow rate, the fan provides the system with necessary oxygen supply to support the growth of microorganisms in the aerobic zone, oxygen is sent to the aerobic zone through the air main pipe and the oxygen supply branch pipe, the water collection tank is used to discharge the treated clean water, and the mixed liquid return pipe and the sludge discharge pipe can make the mixed liquid return and the sludge return form a gravity flow, and the energy consumption is low.

[0021] Thirdly, the present invention can form turbulent flow by arranging a single fan so that the flow of wastewater, mixed liquid return and sludge return are staggered, thereby greatly reducing the investment and use of equipment and facilitating maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the front elevation structure of the present invention;

[0023] Figure 2 It is a schematic diagram of the top view structure of the present invention;

[0024] Figure 3 It is a schematic diagram of the cross-sectional structure of the present invention from top view;

[0025] Figure 4 It is a schematic diagram of the cross-sectional structure of the present invention from top view;

[0026] Figure 5 This is a schematic diagram of the water quality structure of the inlet and outlet water of the present invention;

[0027] Figure 6 This is a schematic diagram of the water quality structure of the inlet and outlet water of the present invention;

[0028] Figure 7 Schematic diagram of the water quality structure of the inlet and outlet water of the present invention

[0029] Figure 8 It is a schematic diagram of the inlet and outlet water quality structure of the present invention.

[0030] Wherein: 1. Reactor tank; 2. Anaerobic zone; 3. Anoxic zone; 4. Aerobic zone; 5. Sedimentation zone; 6. Air lift water tank; 7. Fan; 11. First baffle; 12. Second baffle; 13. Baffle flow hole; 21. Wastewater lift pump; 22. Reactor water inlet pipe; 41. Aerobic zone level gauge; 51. Inclined tube; 52. Sump; 53. Mud discharge pipe; 54. Mud return valve; 55. Sedimentation zone level gauge; 61. Air lift pipe; 62. Sedimentation zone water inlet pipe; 63. Mixed liquor return pipe; 64. Mixed liquor return valve; 65. Air lift water tank level gauge; 71. Air main pipe; 72. Air lift branch pipe; 73. Oxygen supply branch pipe; 74. Aeration plate; 75. First air valve. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] The present invention provides the following technical solutions:

[0033] See also Figure 1 , Figure 2 , Figure 3 and Figure 4 A three-dimensional AAO wastewater treatment reactor comprises a reactor tank 1, a gas lift water tank 6 is arranged on the top of the reactor tank 1, and a sedimentation area 5 is arranged outside the reactor tank 1;

[0034] The inside of the reactor tank body 1 is fixedly connected with a first partition 11 and a second partition 12 in sequence, and the tops of the first partition 11 and the second partition 12 are respectively provided with partition flow holes 13. The inside of the reactor tank body 1 is divided into an anaerobic zone 2, an anoxic zone 3 and an aerobic zone 4 from bottom to top by the first partition 11 and the second partition 12. A wastewater lifting pump 21 is arranged outside the reactor tank body 1, and a reactor water inlet pipe 22 is arranged at one end of the wastewater lifting pump 21;

[0035] A mixed liquid reflux pipe 63 is installed on the outside of the air lift water tank 6, an air lift pipe 61 is installed at the bottom of the air lift water tank 6, an air lift branch pipe 72 is installed at one end of the air lift pipe 61, a first air valve 75 is provided on the air lift branch pipe 72, an air main pipe 71 is installed at one end of the air lift branch pipe 72 away from the air lift pipe 61, a fan 7 is installed at one end of the air main pipe 71 away from the air lift branch pipe 72, and a sedimentation area water inlet pipe 62 is installed at both ends of the air lift water tank 6;

[0036] An inclined pipe 51 is arranged inside the sedimentation area 5 , a mud discharge pipe 53 is installed at the bottom of the sedimentation area 5 , and a water collecting tank 52 is opened outside the sedimentation area 5 .

[0037] Through the above technical solution, the main part of the entire sewage treatment system of the reactor tank body 1 is divided into three main areas, namely, the anaerobic zone 2, the anoxic zone 3 and the aerobic zone 4, by the first partition 11 and the second partition 12. The first partition 11 and the second partition 12 divide the internal space of the reactor tank body 1 into different treatment areas to ensure that the water flows along the preset path and enhance the treatment effect. The flow holes 13 of the partitions are provided to facilitate the flow of water. The anaerobic zone 2 is located at the bottom and is mainly used for the preliminary decomposition of organic matter. The organic matter is converted into volatile fatty acids and other simple compounds by the action of anaerobic microorganisms. The anoxic zone 3 is located in the middle and is used to further decompose the organic matter. In the process, denitrification is performed to reduce nitrates to nitrogen. The aerobic zone 4 is located at the top and provides sufficient oxygen through aeration to promote the growth of aerobic microorganisms and further decompose organic matter. The wastewater lifting pump 21 sends the sewage into the anaerobic zone 2 in the reactor tank body 1 through the reactor inlet pipe 22. The anaerobic zone 2, the anoxic zone 3 and the aerobic zone 4 are arranged vertically to save space.

[0038] The air lift water tank 6 is installed on the top of the reactor tank 1. The air lift pipe 61 is used to lift the mixed liquid into the air lift water tank 6. A part of the mixed liquid flows back to the anoxic zone 3 by gravity through the mixed liquid return pipe 63 for denitrification, and the other part flows into the sedimentation zone 5 by gravity through the sedimentation zone water inlet pipe 62. The air lift branch pipe 72 is provided with a first air valve 75 for controlling the gas flow rate. The fan 7 provides the necessary oxygen supply for the system to support the growth of microorganisms in the aerobic zone 4, and oxygen is sent to the aerobic zone 4 through the air main pipe 71 and the oxygen supply branch pipe 73.

[0039] The inclined pipe 51, the sludge discharge pipe 53 and the water collection tank 52 act together in the sedimentation zone 5. The inclined pipe 51 is used to assist in settling the sludge in the mixed liquid to the bottom of the sedimentation zone 5, the sludge discharge pipe 53 is used to return the sludge to the anaerobic zone 2 by gravity, and the water collection tank 52 is used to discharge the treated clean water.

[0040] Specifically, an aerobic zone level gauge 41 is installed on the top of the reactor tank 1 , a sedimentation zone level gauge 55 is installed on the top of the sedimentation zone 5 , and an air lift water tank level gauge 65 is installed on the top of the air lift water tank 6 .

[0041] Through the above technical solution, the aerobic zone level gauge 41, the sedimentation zone level gauge 55 and the air lift tank level gauge 65 are used to monitor the liquid level heights of various key parts to ensure the normal operation of the system.

[0042] Specifically, one end of the reactor water inlet pipe 22 away from the wastewater lifting pump 21 is connected to the anaerobic zone 2 inside the reactor water inlet pipe 22 , and the bottom of the air lift pipe 61 passes through the reactor tank body 1 and extends to the inside of the aerobic zone 4 .

[0043] Through the above technical solution, the reactor water inlet pipe 22 is connected to the inside of the anaerobic zone 2 for introducing sewage, and the bottom of the air lift pipe 61 penetrates into the aerobic zone 4 for bringing the mixed liquid in the aerobic zone 4 into the air lift water tank 6 to enhance its fluidity.

[0044] Specifically, a plurality of mud discharge pipes 53 are provided, and the plurality of mud discharge pipes 53 are distributed in a ring array.

[0045] Through the above technical solution, the sludge discharge pipes 53 are distributed in a circular array, which facilitates the uniform discharge of sludge from the bottom of the sedimentation area 5.

[0046] Specifically, one end of the plurality of sludge discharge pipes 53 away from the sedimentation zone 5 is respectively connected to the anaerobic zone 2 of the reactor tank 1 , and a sludge return valve 54 is respectively installed on the plurality of sludge discharge pipes 53 .

[0047] Through the above technical solution, one end of a plurality of sludge discharge pipes 53 is respectively connected to the anaerobic zone 2 inside the reactor tank 1, so that the sludge can flow back to the anaerobic zone 2 by gravity, and the sludge return valve 54 is used to control the return speed and amount of the sludge. By adjusting the opening of the valve, the sludge return speed can be flexibly adjusted to ensure that the anaerobic zone 2 has sufficient activated sludge.

[0048] Specifically, the bottom of the mixed liquid reflux pipe 63 passes through the reactor tank body 1 and extends to the interior of the anoxic zone 3. Several sedimentation zone water inlet pipes 62 are provided, and several sedimentation zone water inlet pipes 62 are respectively connected to the sedimentation zone 5. Mixed liquid reflux valves 64 are respectively provided on several mixed liquid reflux pipes 63.

[0049] Through the above technical solution, a part of the mixed liquid lifted by the air lift pipe 61 and entering the air lift water tank 6 flows into the sedimentation zone 5 through the sedimentation zone water inlet pipe 62, and the other part flows back to the anoxic zone 3 by gravity through the mixed liquid return pipe 63 for denitrification. The mixed liquid return amount is adjusted by adjusting the mixed liquid return valve 64. By adopting gravity flow, energy consumption is low.

[0050] Specifically, a plurality of partition plate flow holes 13 are provided, and the plurality of partition plate flow holes 13 are distributed in a ring array.

[0051] Through the above technical solution, the first baffle 11 and the second baffle 12 are respectively provided with a plurality of baffle flow holes 13, which are distributed in a ring array and can evenly distribute water.

[0052] Specifically, an oxygen supply branch pipe 73 is installed at the bottom of the air main pipe 71 , and an aeration plate 74 is installed at the top of the second partition plate 12 located in the aerobic zone 4 .

[0053] Through the above technical solution, oxygen can be injected into the aerobic zone 4 through the oxygen supply branch pipe 73 and the aeration plate 74 in cooperation with the fan 7, thereby promoting the development of beneficial bacteria and accelerating the decomposition of organic matter.

[0054] Specifically, a second air valve is installed on the oxygen supply branch pipe 73 , and one end of the oxygen supply branch pipe 73 away from the air main pipe 71 is connected to the aeration plate 74 by penetrating the reactor tank body 1 .

[0055] Through the above technical solution, a second air valve is installed on the oxygen supply branch pipe 73 to control the flow rate of oxygen, thereby ensuring that the oxygen supply in the aerobic zone 4 is moderate and avoiding excessive or insufficient oxygen.

[0056] When in use, the wastewater enters the anaerobic zone 2 through the wastewater lifting pump 21 and the reactor water inlet pipe 22, enters the anoxic zone 3 from the middle flow hole of the partition flow hole 13 on the first partition 11, enters the aerobic zone 4 from the partition flow hole 13 on the second partition, and then is lifted from the air lift pipe 61 in the middle of the aerobic zone 4 to enter the air lift water tank 6. A part of the mixed liquid flows into the sedimentation zone 5 through the sedimentation zone water inlet pipe 62 by gravity, and the other part flows back to the anoxic zone 3 through the mixed liquid return pipe 63 by gravity for denitrification. The mixed liquid return amount is adjusted by adjusting the mixed liquid return valve 64, and the sedimentation An inclined pipe 51 is provided in the sedimentation area 5, and the mixed liquid is precipitated through the inclined pipe 51, and the sludge is gravity-precipitated into the bottom of the sedimentation area 5. A sludge discharge pipe 53 is provided at the bottom of the sedimentation area 5. The sludge return valve 54 is controlled to return the sludge to the anaerobic area 2 by gravity, and the supernatant is discharged through the water collecting tank 52. The fan 7 can adjust the air volume, and an air lift branch pipe 72 and an oxygen supply branch pipe 73 are separated from the air main pipe 71. The air lift branch pipe 72 supplies air to the air lift pipe 61. An aeration plate 74 is arranged at the bottom of the aerobic area 4, and air is supplied through the oxygen supply branch pipe 73. The air lift water volume is adjusted by adjusting the first air valve 75.

[0057] A treatment scale in Zhejiang is 110m 3 / d rural domestic sewage project, using mechanical screen-regulating tank-AAO-secondary sedimentation tank-ultraviolet disinfection process. The biochemical system adopts a cylindrical structure and covers an area of ​​about 25m 2 , operating power 2.2kW, compared with similar projects, the floor space is reduced by 20%, the operating power is reduced by 30%, and the equipment investment cost is reduced by 10%. The sludge return ratio is controlled at 100% and the mixed liquid return ratio is 200%. The project effluent is stable and meets the standards. The inlet and outlet water quality of the project after continuous operation for 15 days is as follows: Figure 5 , Figure 6 , Figure 7 and Figure 8 .

[0058] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and alterations may be made to the embodiments without departing from the principles and spirit thereof, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A three-dimensional AAO wastewater treatment reactor, comprising a reactor tank (1), characterized in that: A gas lift water tank (6) is arranged on the top of the reactor tank (1), and a sedimentation area (5) is arranged on the outside of the reactor tank (1); The reactor tank body (1) is fixedly connected with a first partition (11) and a second partition (12) in sequence, and the tops of the first partition (11) and the second partition (12) are respectively provided with partition flow holes (13). The interior of the reactor tank body (1) is divided into an anaerobic zone (2), an anoxic zone (3) and an aerobic zone (4) from bottom to top by the first partition (11) and the second partition (12). A wastewater lifting pump (21) is arranged outside the reactor tank body (1), and a reactor water inlet pipe (22) is arranged at one end of the wastewater lifting pump (21); A mixed liquid return pipe (63) is installed on the outside of the air lift water tank (6), an air lift pipe (61) is installed at the bottom of the air lift water tank (6), an air lift branch pipe (72) is installed at one end of the air lift pipe (61), a first air valve (75) is provided on the air lift branch pipe (72), an air main pipe (71) is installed at one end of the air lift branch pipe (72) away from the air lift pipe (61), a fan (7) is installed at one end of the air main pipe (71) away from the air lift branch pipe (72), and a sedimentation zone water inlet pipe (62) is installed around the air lift water tank (6); An inclined pipe (51) is arranged inside the sedimentation area (5), a mud discharge pipe (53) is installed at the bottom of the sedimentation area (5), and a water collecting tank (52) is opened outside the sedimentation area (5).

2. A three-dimensional AAO sewage treatment reactor according to claim 1, characterized in that: The top of the reactor tank (1) is equipped with an aerobic zone level gauge (41), the top of the sedimentation zone (5) is equipped with a sedimentation zone level gauge (55), and the top of the air lift water tank (6) is equipped with an air lift water tank level gauge (65).

3. A three-dimensional AAO sewage treatment reactor according to claim 1, characterized in that: One end of the reactor water inlet pipe (22) away from the wastewater lifting pump (21) is connected to the anaerobic zone (2) through the reactor water inlet pipe (22), and the bottom of the air lift pipe (61) passes through the bottom of the air lift water tank (6) and extends to the inside of the aerobic zone (4).

4. A three-dimensional AAO sewage treatment reactor according to claim 1, characterized in that: A plurality of the mud discharge pipes (53) are provided, and the plurality of the mud discharge pipes (53) are distributed in a ring array.

5. The three-dimensional AAO sewage treatment reactor according to claim 1, characterized in that: One end of the plurality of sludge discharge pipes (53) away from the sedimentation zone (5) is respectively connected to the anaerobic zone (2) of the reactor tank (1), and a sludge return valve (54) is respectively installed on the plurality of sludge discharge pipes (53).

6. The three-dimensional AAO sewage treatment reactor according to claim 1, characterized in that: The bottom of the mixed liquid reflux pipe (63) passes through the second partition plate (12) and extends to the interior of the anoxic zone (3). A plurality of the sedimentation zone water inlet pipes (62) are provided. The plurality of sedimentation zone water inlet pipes (62) are respectively connected to the sedimentation zone (5). A plurality of the mixed liquid reflux pipes (63) are respectively provided with mixed liquid reflux valves (64).

7. The three-dimensional AAO sewage treatment reactor according to claim 1, characterized in that: A plurality of the partition plate flow holes (13) are provided, and the plurality of the partition plate flow holes (13) are distributed in a ring array.

8. The three-dimensional AAO sewage treatment reactor according to claim 1, characterized in that: An oxygen supply branch pipe (73) is installed at the bottom of the air main pipe (71), and an aeration plate (74) is installed on the upper part of the second partition plate (12).

9. A three-dimensional AAO sewage treatment reactor according to claim 8, characterized in that: A second air valve is installed on the oxygen supply branch pipe (73), and one end of the oxygen supply branch pipe (73) away from the air main pipe (71) extends into the reactor tank (1) and is connected to the aeration plate (74).

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