Mixing and stirring system for anoxic tank in biochemical system of sewage treatment plant and operation method

Abstract

The invention discloses an anoxic tank mixing and stirring system for a biochemical system of a sewage treatment plant, which comprises a fixed conveying pipeline and is characterized in that the input end of the fixed conveying pipeline is connected to a submersible sewage pump in an aerobic tank; the output end of the fixed conveying pipeline extends to the position above the anoxic tank and is connected with a vertically-downward movable conveying pipeline, the movable conveying pipeline is movably connected with the fixed conveying pipeline through a connector, and the lower end of the movable conveying pipeline extends to the position close to the bottom of the anoxic tank. A horizontal water distribution pipe is arranged at the lower end of the movable conveying pipeline; a plurality of water distribution holes are formed in the water distribution pipe. A water distribution pipe adjusting mechanism is further arranged on the movable conveying pipeline, and an anti-blocking mechanism is further arranged in the water distribution pipe. The problem that the sewage treatment environment of the anoxic tank and the anaerobic tank of the biochemical system is damaged due to aeration stirring of an integrated sewage treatment plant is solved, and the problem that the sewage treatment process and the effluent quality are affected due to activated sludge precipitation caused by the absence of stirring facilities in the anoxic tank and the anaerobic tank is also solved.

Description

Technical Field

[0001] The invention relates to the technical field of sewage treatment, and in particular to an anoxic tank mixing and stirring system and an operating method used in a biochemical system of a sewage treatment plant. Background Art

[0002] At present, the integrated sewage treatment plant adopts the hydrolysis acidification tank + AA0 + MBR sewage treatment process. In the original design, the anaerobic tank and the anoxic tank are stirred by aeration. Aeration stirring requires injecting gas into the tank through aeration equipment to achieve the purpose of mixing and stirring. However, the anaerobic tank needs to release phosphorus under anaerobic conditions (D0≤0.2mg / l), and the anoxic tank needs to denitrify under anoxic conditions (D0≤0.5mg / l). The gas stirring method destroys the anaerobic and anoxic environment, seriously affecting the treatment effect of total phosphorus and total nitrogen in the sewage plant. This stirring method has the problem of high energy consumption. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide an anoxic tank mixing and stirring system and an operating method for the biochemical system of a sewage treatment plant, which solves the problem of aeration stirring in an integrated sewage treatment plant causing damage to the sewage treatment environment of anoxic tanks and anaerobic tanks in the biochemical system, and also solves the problem of activated sludge precipitation in anoxic tanks and anaerobic tanks due to the lack of stirring facilities, which affects the sewage treatment process and effluent water quality.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is: an anoxic tank mixing and stirring system for a biochemical system of a sewage treatment plant, comprising a fixed delivery pipeline, characterized in that: the input end of the fixed delivery pipeline is connected to a submersible sewage pump in an aerobic tank, the output end of the fixed delivery pipeline extends to the top of the anoxic tank and is connected to a vertically downward movable delivery pipeline, the movable delivery pipeline is movably connected to the fixed delivery pipeline through a joint, the lower end of the movable delivery pipeline extends to a position close to the bottom of the anoxic tank, and the lower end of the movable delivery pipeline is provided with a horizontal water distribution pipe; The water distribution pipe is provided with a plurality of water distribution holes.

[0005] In a preferred solution, the fixed delivery pipeline is provided with a shunt pipe, and the shunt pipe is provided with a flow regulating valve; The diversion pipe is located in the aerobic tank.

[0006] In a preferred solution, the movable conveying pipeline is also provided with a water distribution pipe adjustment mechanism; The water distribution pipe adjustment mechanism comprises a motor arranged on the top of the pool wall between the aerobic pool and the anoxic pool, the motor driving shaft is upward and connected to a vertical driving shaft, the upper end of the driving shaft is provided with a first half gear, an outer sleeve shaft is sleeved on the outside of the driving shaft, and the outer sleeve shaft is provided with a second half gear; The movable conveying pipeline is provided with two upper and lower driven gears, and the two driven gears are respectively arranged at the same horizontal height with the first half gear and the second half gear and meshed with each other.

[0007] In a preferred solution, a driven bevel gear is provided on the driving shaft and the outer sleeve shaft respectively, and a bevel gear pair is formed between the two driven bevel gears through an axially horizontal intermediate bevel gear. The intermediate bevel gear is fixed to the top of the pool wall between the aerobic pool and the anoxic pool through a support rod.

[0008] In a preferred solution, there are two water distribution pipes, a tee is provided at the lower end of the movable conveying pipeline, one end of the two water distribution pipes is connected to the tee, and a removable plug is provided on the other end.

[0009] In a preferred embodiment, the movable conveying pipeline is arranged at one of the corners of the anoxic pool, and the two water distribution pipes are arranged at an angle of 45° on the horizontal plane.

[0010] In a preferred solution, an anti-blocking mechanism is also provided in the water distribution pipe; The anti-blocking mechanism includes a main shaft, and a plurality of arc-shaped water distribution hole baffles are fixedly provided on the outer wall of the main shaft through support rods. The arc-shaped water distribution hole baffles are attached to the inner wall of the water distribution pipe and the area of ​​the arc-shaped water distribution hole baffles is larger than the area of ​​the water distribution hole.

[0011] In a preferred solution, the anti-blocking mechanism further includes a reset mechanism arranged at one end of the main shaft; The reset mechanism comprises an outer fixed cylinder and an inner movable cylinder, a torsion spring is arranged in the gap between the outer fixed cylinder and the inner movable cylinder, and a plurality of inclined blades are evenly distributed in the annular direction between the end of the main shaft and the inner wall of the inner movable cylinder; The external fixed cylinder is fixedly connected to the inner wall of the water distribution pipe.

[0012] In a preferred solution, the anti-blocking mechanism is arranged at the input end of the water distribution pipe.

[0013] Based on the above-mentioned operation method of the anoxic tank mixing and stirring system in the biochemical system of a sewage treatment plant, the following steps are included: 1) Start the submersible sewage pump, which will transfer the mud-water mixture in the anoxic tank into the fixed delivery pipeline; 2) By adjusting the opening of the flow regulating valve on the diversion pipe, the flow and pressure of the mud-water mixture in the fixed conveying pipeline can be achieved; 3) The mud-water mixture is fed from the fixed conveying pipeline to the movable conveying pipeline, and finally output to the anoxic tank through the water distribution holes on the water distribution pipe to stir the sludge in the anoxic tank; In the above step 1), the motors are started at the same time, so that the driving shaft and the outer sleeve shaft rotate coaxially and in opposite directions under the action of the bevel gear pair, and the first half gear and the driven gear, and the second half gear and the driven gear are alternately meshed, so that the movable conveying pipeline drives the two water distribution pipes to rotate repeatedly in the clockwise and counterclockwise directions; In the above step 3), when the water flows into the water distribution pipe, the water flows impact the inclined blades and drive the anti-blocking mechanism to rotate axially, so that the arc-shaped water distribution hole baffle rotates and the water distribution hole opens; When the submersible sewage pump stops, the water flow stops impacting the anti-blocking mechanism, and under the action of the torsion spring, the anti-blocking mechanism rotates in the opposite direction until the water distribution hole blocking piece blocks the water distribution hole.

[0014] The present invention provides an anoxic tank mixing and stirring system and an operating method for a biochemical system of a sewage treatment plant. By adopting the above structure and method, the following beneficial effects are achieved: (1) Instead of the conventional aeration stirring method, it stirs the anoxic tank or anaerobic tank, fully mixes the sludge and sewage in the water, and prevents the activated sludge from settling in the anoxic tank and anaerobic tank; (2) The water distribution pipe adjustment mechanism can realize the reciprocating adjustment of the water distribution pipe position, which can ensure the uniformity of the stirring and mixing effect; (3) When the submersible sewage pump is started, the water distribution hole is opened by relying on the impact of water flow. When the submersible sewage pump is not in working state, the water distribution hole can be closed to prevent sludge from entering the water distribution pipe and causing pipe blockage. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention will be further described below in conjunction with the accompanying drawings and embodiments: Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0016] Figure 2 It is a schematic diagram of the structure of the water distribution pipe adjustment mechanism of the present invention.

[0017] Figure 3 It is a schematic diagram of the structure of the first half gear and the second half gear of the present invention.

[0018] Figure 4 It is a schematic diagram of the radial cross-sectional structure of the water distribution pipe of the present invention.

[0019] Figure 5 It is a schematic diagram of the anti-blocking mechanism structure of the present invention.

[0020] Figure 6 It is an axial view of the water distribution pipe of the present invention.

[0021] Figure 7 It is an axial view of the reset mechanism of the present invention.

[0022] Figure 8It is a schematic diagram of the top view of the anoxic pool of the present invention.

[0023] In the figure: aerobic pool 1, anoxic pool 2, submersible sewage pump 3, fixed conveying pipeline 4, movable conveying pipeline 5, diverter pipe 6, flow regulating valve 7, water distribution pipe 8, water distribution hole 9, water distribution pipe adjustment mechanism 10, motor 11, driving shaft 12, first half gear 13, outer sleeve shaft 14, second half gear 15, driven gear 16, driven bevel gear 17, intermediate bevel gear 18, removable plug 19, anti-blocking mechanism 20, main shaft 21, arc-shaped water distribution hole baffle 22, reset mechanism 23, outer fixed cylinder 24, inner movable cylinder 25, inclined blade 26, torsion spring 27, tee 28. DETAILED DESCRIPTION

[0024] Embodiment 1: like Figure 1 In the invention, an anoxic tank mixing and stirring system for a biochemical system of a sewage treatment plant comprises a fixed delivery pipeline 4, the input end of the fixed delivery pipeline 4 is connected to a submersible sewage pump 3 in an aerobic tank 1, the output end of the fixed delivery pipeline 4 extends to above the anoxic tank 2 and is connected to a vertically downward movable delivery pipeline 5, the movable delivery pipeline 5 is movably connected to the fixed delivery pipeline 4 through a joint, the lower end of the movable delivery pipeline 5 extends to a position close to the bottom of the anoxic tank 2, and the lower end of the movable delivery pipeline 5 is provided with a horizontal water distribution pipe 8; The water distribution pipe 8 is provided with a plurality of water distribution holes 9 .

[0025] In a preferred solution, the fixed delivery pipeline 4 is provided with a shunt pipe 6, and the shunt pipe 6 is provided with a flow regulating valve 7; The diversion pipe 6 is located in the aerobic pool 1 .

[0026] By adjusting the flow regulating valve 7 on the shunt pipe 6 , the flow and pressure in the delivery pipeline 4 are fixed, and the shunt flow flows back to the aerobic pool 1 .

[0027] Embodiment 2: Combination Figure 2 , 3 As shown, based on Example 1, the movable conveying pipeline 5 is further provided with a water distribution pipe adjustment mechanism 10; The water distribution pipe adjustment mechanism 10 includes a motor 11 disposed on the top of the pool wall between the aerobic pool 1 and the anoxic pool 2. The motor 11 drives an upward shaft and is connected to a vertical driving shaft 12. A first half gear 13 is disposed on the upper end of the driving shaft 12. An outer sleeve shaft 14 is sleeved on the outer portion of the driving shaft 12. A second half gear 15 is disposed on the outer sleeve shaft 14. The movable conveying pipeline 5 is provided with two upper and lower driven gears 16 , and the two driven gears 16 are respectively arranged at the same level with the first half gear 13 and the second half gear 15 and meshed with each other.

[0028] In a preferred embodiment, a driven bevel gear 17 is provided on the driving shaft 12 and the outer sleeve shaft 14 respectively, and the two driven bevel gears 17 are driven by an axially horizontal intermediate bevel gear 18 to form a bevel gear pair; The intermediate bevel gear 18 is fixed to the top of the pool wall between the aerobic pool 1 and the anoxic pool 2 through a support rod.

[0029] The preferred solution is Figure 4 In the figure, there are two water distribution pipes 8, a tee 28 is provided at the lower end of the movable conveying pipeline 5, one end of the two water distribution pipes 8 is connected to the tee 28, and a removable plug 19 is provided at the other end.

[0030] The preferred solution is Figure 8 In the embodiment, the movable conveying pipeline 5 is arranged at one of the corners of the anoxic pool 2, and the two water distribution pipes 8 are arranged at an angle of 45° on the horizontal plane.

[0031] Embodiment 3: Combined with Figure 5-7 As shown, based on Example 1, an anti-blocking mechanism 20 is further provided in the water distribution pipe 8; The anti-blocking mechanism 20 includes a main shaft 21, and a plurality of arc-shaped water distribution hole baffles 22 are fixed on the outer wall of the main shaft 21 by support rods. The arc-shaped water distribution hole baffles 22 are attached to the inner wall of the water distribution pipe 8 and the area of ​​the arc-shaped water distribution hole baffles 22 is larger than the area of ​​the water distribution hole 9.

[0032] In a preferred embodiment, the anti-blocking mechanism 20 further includes a reset mechanism 23 disposed at one end of the main shaft 21; The reset mechanism 23 includes an outer fixed cylinder 24 and an inner movable cylinder 25. A torsion spring 27 is provided in the gap between the outer fixed cylinder 24 and the inner movable cylinder 25. A plurality of inclined blades 26 are evenly distributed in an annular direction between the end of the main shaft 21 and the inner wall of the inner movable cylinder 25. The outer fixed cylinder 24 is fixedly connected to the inner wall of the water distribution pipe 8 .

[0033] In a preferred solution, the anti-blocking mechanism 20 is arranged at the input end of the water distribution pipe 8.

[0034] Embodiment 4: Based on the above embodiment, an operation method of an anoxic tank mixing and stirring system for a biochemical system of a sewage treatment plant includes the following steps: 1) Start the submersible sewage pump 3, which transfers the mud-water mixture in the anoxic tank 2 into the fixed delivery pipeline 4; 2) By adjusting the opening of the flow regulating valve 7 on the diversion pipe 6, the flow rate and pressure of the mud-water mixture in the fixed delivery pipeline 4 are achieved; 3) The mud-water mixture is fed from the fixed delivery pipe 4 to the movable delivery pipe 5, and finally output to the anoxic tank 2 through the water distribution hole 9 on the water distribution pipe 8, so as to stir the sludge in the anoxic tank 2; In the above step 1), the motor 11 is started at the same time, so that the driving shaft 12 and the outer sleeve shaft 14 rotate coaxially and in opposite directions under the action of the bevel gear pair, and the first half gear 13 and the driven gear 16, and the second half gear 15 and the driven gear 16 are alternately meshed, so that the movable conveying pipeline 5 drives the two water distribution pipes 8 to rotate repeatedly in the clockwise and counterclockwise directions; In the above step 3), when the water flows into the water distribution pipe 8, the water flows impact the inclined blades 26 and drive the anti-blocking mechanism 20 to rotate axially, so that the arc-shaped water distribution hole baffle 22 rotates and the water distribution hole 9 opens; When the submersible sewage pump 3 stops working, the water flow stops impacting the anti-blocking mechanism 20 , and under the action of the torsion spring 27 , the anti-blocking mechanism 20 rotates in the opposite direction until the water distribution hole blocking piece 22 blocks the water distribution hole 9 .

[0035] The above scheme disclosed by the present invention can eliminate the defects caused by gas stirring, and replace gas stirring with a new stirring method to stir the anoxic tank and the anaerobic tank, so that the sludge and sewage in the water are fully mixed, and the activated sludge is prevented from settling in the anoxic tank and the anaerobic tank.

[0036] When working, the submersible sewage pump 3 returns the nitrification liquid or sludge in the biochemical system through the conveying pipeline to the water distribution pipe, and the submersible sewage pump 3 increases the pressure of the conveyed water flow to form a pressurized water flow. The pressurized water flow is ejected through the water distribution hole to form a hydraulic impact, which impacts the precipitated sludge at the bottom of the pool, drives the water volume in the pool, plays a stirring role, and fully mixes the sludge and sewage.

[0037] The overall structure is also used for nitrification liquid reflux or sludge reflux in sewage treatment systems. The nitrification liquid or sludge mixture is refluxed internally and externally in the biochemical system through this set of equipment. The internal and external reflux water is evenly distributed in the pool through the holes in the steel pipe. Because the water flow has a certain impact force when passing through the holes, the returned sludge and nitrification liquid are also fully in contact with the sludge mixture in the water due to the hydraulic impact, which increases the effect of sewage treatment.

Claims

1. A mixing and stirring system for anoxic tanks in a biochemical system of a sewage treatment plant, comprising a fixed delivery pipeline (4), Features: The input end of the fixed delivery pipeline (4) is connected to the submersible sewage pump (3) in the aerobic pool (1), the output end of the fixed delivery pipeline (4) extends to the top of the anoxic pool (2) and is connected to a vertically downward movable delivery pipeline (5), the movable delivery pipeline (5) and the fixed delivery pipeline (4) are movably connected via a joint, the lower end of the movable delivery pipeline (5) extends to a position close to the bottom of the anoxic pool (2), and a horizontal water distribution pipe (8) is provided at the lower end of the movable delivery pipeline (5); The water distribution pipe (8) is provided with a plurality of water distribution holes (9).

2. The anoxic tank mixing and stirring system used in the biochemical system of a sewage treatment plant according to claim 1, Features: The fixed delivery pipeline (4) is provided with a shunt pipe (6), and the shunt pipe (6) is provided with a flow regulating valve (7); The diversion pipe (6) is located in the aerobic pool (1).

3. The anoxic tank mixing and stirring system used in the biochemical system of a sewage treatment plant according to claim 1, Features: The movable conveying pipeline (5) is also provided with a water distribution pipe adjustment mechanism (10); The water distribution pipe adjustment mechanism (10) comprises a motor (11) arranged at the top of the pool wall between the aerobic pool (1) and the anoxic pool (2), the motor (11) driving shaft is upward and connected to a vertical driving shaft (12), the driving shaft (12) is provided with a first half gear (13) at the upper end, an outer sleeve shaft (14) is sleeved on the outside of the driving shaft (12), and the outer sleeve shaft (14) is provided with a second half gear (15); The movable conveying pipe (5) is provided with two upper and lower driven gears (16), and the two driven gears (16) are respectively arranged at the same level as the first half gear (13) and the second half gear (15) and mesh with each other.

4. The anoxic tank mixing and stirring system used in the biochemical system of a sewage treatment plant according to claim 3, Features: A driven bevel gear (17) is also provided on the driving rotating shaft (12) and the outer sleeve shaft (14), respectively. The two driven bevel gears (17) are driven by an axially horizontal intermediate bevel gear (18) to form a bevel gear pair. The intermediate bevel gear (18) is fixed to the top of the pool wall between the aerobic pool (1) and the anoxic pool (2) via a support rod.

5. The anoxic tank mixing and stirring system used in the biochemical system of a sewage treatment plant according to claim 1, Features: There are two water distribution pipes (8), and a tee (28) is provided at the lower end of the movable conveying pipeline (5). One end of the two water distribution pipes (8) is connected to the tee (28), and the other end is provided with a removable plug (19).

6. The anoxic tank mixing and stirring system used in the biochemical system of a sewage treatment plant according to claim 5, Features: The movable conveying pipeline (5) is arranged at one of the corners of the anoxic pool (2), and the two water distribution pipes (8) are arranged at an angle of 45° on a horizontal plane.

7. The anoxic tank mixing and stirring system used in the biochemical system of a sewage treatment plant according to claim 1, Features: An anti-blocking mechanism (20) is also provided in the water distribution pipe (8); The anti-blocking mechanism (20) comprises a main shaft (21), and a plurality of arc-shaped water distribution hole blocking pieces (22) are fixedly provided on the outer wall of the main shaft (21) via supporting rods. The arc-shaped water distribution hole blocking pieces (22) are fitted to the inner wall of the water distribution pipe (8), and the area of ​​the arc-shaped water distribution hole blocking pieces (22) is larger than the area of ​​the water distribution hole (9).

8. The anoxic tank mixing and stirring system used in the biochemical system of a sewage treatment plant according to claim 7, Features: The anti-blocking mechanism (20) further comprises a reset mechanism (23) arranged at one end of the main shaft (21); The reset mechanism (23) comprises an outer fixed cylinder (24) and an inner movable cylinder (25); a torsion spring (27) is provided in the gap between the outer fixed cylinder (24) and the inner movable cylinder (25); and a plurality of inclined blades (26) are evenly distributed in the circumferential direction between the end of the main shaft (21) and the inner wall of the inner movable cylinder (25); The external fixed cylinder (24) is fixedly connected to the inner wall of the water distribution pipe (8).

9. The anoxic tank mixing and stirring system used in the biochemical system of a sewage treatment plant according to claim 8, Features: The anti-blocking mechanism (20) is arranged at the input end of the water distribution pipe (8).

10. An operating method for an anoxic tank mixing and stirring system in a biochemical system of a sewage treatment plant according to any one of claims 1 to 9, Features The following steps are involved: 1) starting the submersible sewage pump (3), so that the submersible sewage pump (3) transfers the mud-water mixture in the anoxic tank (2) into the fixed delivery pipeline (4); 2) by adjusting the opening of the flow regulating valve (7) on the diversion pipe (6), the flow rate and pressure of the mud-water mixture in the conveying pipeline (4) are fixed; 3) The sludge-water mixture is fed from the fixed conveying pipe (4) to the movable conveying pipe (5), and finally output to the anoxic tank (2) through the water distribution hole (9) on the water distribution pipe (8), thereby stirring the sludge in the anoxic tank (2); In the above step 1), the motor (11) is started simultaneously, so that the driving shaft (12) and the outer sleeve shaft (14) rotate coaxially and in opposite directions under the action of the bevel gear pair, and the first half gear (13) and the driven gear (16), and the second half gear (15) and the driven gear (16) are alternately meshed, so that the movable conveying pipeline (5) drives the two water distribution pipes (8) to rotate repeatedly in the clockwise and counterclockwise directions; In the above step 3), when the water flows into the water distribution pipe (8), the water flows impact the inclined blades (26) and drive the anti-blocking mechanism (20) to rotate axially, so that the arc-shaped water distribution hole baffle (22) rotates and the water distribution hole (9) opens; When the submersible sewage pump (3) stops, the water flow stops impacting the anti-blocking mechanism (20), and under the action of the torsion spring (27), the anti-blocking mechanism (20) rotates in the reverse direction until the water distribution hole blocking piece (22) blocks the water distribution hole (9).

Images