Anoxic tank mixing and agitation system for use in a biological system of a wastewater treatment plant and method of operation

Abstract

The application discloses a kind of for sewage treatment plant biochemical system in anoxic tank mixing stirring system, including fixed conveying pipeline, it is characterized by: the input end of the fixed conveying pipeline is connected to the submerged sewage pump in aerobic tank, and the output end of fixed conveying pipeline extends to the top of anoxic tank and is connected with a vertical downward movable conveying pipeline on the end, movable conveying pipeline is movably connected with fixed conveying pipeline by joint, and the lower end of movable conveying pipeline extends to the position close to the bottom of anoxic tank, and the lower end of movable conveying pipeline is equipped with horizontal water distribution pipe;Multiple water distribution holes are provided on the water distribution pipe.Movable conveying pipeline is also provided with water distribution pipe adjusting mechanism, and the water distribution pipe is also provided with anti-blocking mechanism.The application solves the problem of damage to the sewage treatment environment of biochemical system anoxic tank and anaerobic tank caused by integrated sewage treatment plant aeration stirring, and also solves the problem of activated sludge precipitation caused by the lack of stirring facilities in anoxic tank and anaerobic tank, which affects the sewage treatment process and effluent quality.

Description

TECHNICAL FIELD

[0001] The present application relates to the sewage treatment technical field, specifically is a kind of for the lack of oxygen pool mixing and stirring system and operating method in the biochemical system of sewage treatment plant. BACKGROUND

[0002] At present, integrated sewage treatment plant adopts hydrolysis acidification tank+AA0+MBR sewage treatment process, in original design, anaerobic tank and anoxic tank are stirred by aeration, and the purpose of mixing and stirring is realized by injecting gas into the tank through aeration equipment, but anaerobic tank needs to play the role of phosphorus release under anaerobic (D0≤0.2mg / l), and anoxic tank needs to play the role of denitrification under anoxic (D0≤0.5mg / l), and the aeration stirring mode destroys the anaerobic and anoxic environment, seriously affects the treatment effect of total phosphorus and total nitrogen in sewage plant, and this stirring mode has the problem of high energy consumption. SUMMARY

[0003] The technical problem to be solved by the present application is to provide a kind of for the lack of oxygen pool mixing and stirring system and operating method in the biochemical system of sewage treatment plant, solve the problem of destruction of sewage treatment environment in biochemical system anoxic tank and anaerobic tank caused by aeration stirring in integrated sewage treatment plant, also solve the problem of activated sludge precipitation caused by lack of stirring facilities in anoxic tank and anaerobic tank, which affects sewage treatment process and effluent quality.

[0004] To solve the above technical problems, the technical scheme adopted by the present application is: a kind of for the lack of oxygen pool mixing and stirring system in the biochemical system of sewage treatment plant, including fixed conveying pipeline, characterized by: the input end of the fixed conveying pipeline is connected to the submerged sewage pump in the aerobic tank, the output end of the fixed conveying pipeline extends to the upper of the anoxic tank and is connected with a vertical downward movable conveying pipeline at the end, the movable conveying pipeline is movably connected with the fixed conveying pipeline through the joint, the lower end of the movable conveying pipeline extends to the position close to the bottom of the anoxic tank, and the lower end of the movable conveying pipeline is provided with a horizontal water distribution pipe;

[0005] A plurality of water distribution holes are arranged on the water distribution pipe.

[0006] In the preferred scheme, a shunt pipe is arranged on the fixed conveying pipeline, and a flow regulating valve is arranged on the shunt pipe.

[0007] The shunt pipe is located in the aerobic tank.

[0008] In the preferred scheme, a water distribution pipe adjusting mechanism is further arranged on the movable conveying pipeline.

[0009] The water distribution pipe adjusting mechanism comprises a motor arranged on the top of the pool wall between the aerobic pool and the anoxic pool, a driving shaft of the motor is vertically arranged and is connected with a vertical driving shaft, a first half gear is arranged on the upper end of the driving shaft, an outer sleeve shaft is arranged outside the driving shaft, and a second half gear is arranged on the outer sleeve shaft.

[0010] The movable conveying pipeline is provided with two lower driven gears, and the two driven gears are arranged at the same horizontal height and are engaged with the first half gear and the second half gear.

[0011] In the preferred scheme, a driven bevel gear is further arranged on the driving shaft and the outer sleeve shaft respectively, and the two driven bevel gears are driven by an axial horizontal intermediate bevel gear to form a bevel gear pair.

[0012] The intermediate bevel gear is fixed on the top of the pool wall between the aerobic pool and the anoxic pool by a support rod.

[0013] In the preferred scheme, the water distribution pipe is two, the lower end of the movable conveying pipeline is provided with a tee joint, one end of the two water distribution pipes is connected to the tee joint, and the other end is provided with a detachable plug.

[0014] In the preferred scheme, the movable conveying pipeline is arranged at one corner of the anoxic pool, and the two water distribution pipes are arranged at an angle of 45° on the horizontal plane.

[0015] In the preferred scheme, the water distribution pipe is further provided with an anti-blocking mechanism.

[0016] The anti-blocking mechanism comprises a main shaft, a plurality of arc-shaped water distribution hole blocking pieces are fixed on the outer wall of the main shaft by a support rod, the arc-shaped water distribution hole blocking pieces are attached to the inner wall of the water distribution pipe, and the area of the arc-shaped water distribution hole blocking pieces is greater than the area of the water distribution hole.

[0017] In the preferred scheme, the anti-blocking mechanism further comprises a reset mechanism arranged at one end of the main shaft.

[0018] 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 uniformly arranged between the end of the main shaft and the inner wall of the inner movable cylinder.

[0019] The outer fixed cylinder is fixedly connected with the inner wall of the water distribution pipe.

[0020] In the preferred scheme, the anti-blocking mechanism is arranged at the input end of the water distribution pipe.

[0021] Based on the above-mentioned operation method of the anoxic pool mixing and stirring system in the biochemical system of the sewage treatment plant, the following steps are included:

[0022] 1) Start the submersible sewage pump, and input the mud-water mixture in the anoxic pool into the fixed conveying pipeline;

[0023] 2) By adjusting the opening of the flow regulating valve on the shunt pipe, the flow and pressure of the sludge-water mixture in the fixed conveying pipe are realized;

[0024] 3) The sludge-water mixture is input into the movable conveying pipe from the fixed conveying pipe, and finally output into the anoxic tank through the water distribution holes on the water distribution pipe, to stir the sludge in the anoxic tank;

[0025] In the above step 1), the motor is started at the same time, so that the driving shaft and the sleeve shaft rotate coaxially and reversely under the action of the bevel gear pair, and the alternating meshing of the first half gear and the driven gear and the second half gear and the driven gear makes the movable conveying pipe drive the two water distribution pipes to rotate repeatedly in the clockwise and counterclockwise directions;

[0026] In the above step 3), when the water flow enters the water distribution pipe, the water flow impacts the inclined blades and drives the anti-blocking mechanism to rotate axially, so that the arc-shaped water distribution hole flap rotates and the water distribution hole opens;

[0027] When the sewage pump is stopped, the water flow stops impacting the anti-blocking mechanism, and under the action of the torsion spring, the anti-blocking mechanism reversely rotates to block the water distribution hole.

[0028] The present application provides a kind of for the anoxic tank mixing and stirring system and operating method in the biochemical system of sewage treatment plant, by using the above structure and method, with the following beneficial effects:

[0029] (1) Instead of the conventional aeration stirring mode, the anoxic tank or anaerobic tank is stirred, so that the sludge and sewage in the water are fully mixed, and the activated sludge is prevented from precipitating in the anoxic tank and anaerobic tank;

[0030] (2) The reciprocating movement adjustment of the water distribution pipe position is realized by the water distribution pipe adjusting mechanism, which can ensure the uniformity of the stirring and mixing effect;

[0031] (3) When the sewage pump is started, the water distribution hole is opened by water impact, and the water distribution hole can be closed in the non-working state of the sewage pump to prevent the sludge from entering the water distribution pipe and causing pipe blockage. BRIEF DESCRIPTION OF DRAWINGS

[0032] The present application will be further described below in conjunction with the drawings and examples:

[0033] Figure 1 It is a schematic diagram of the overall structure of the present application.

[0034] Figure 2 It is a schematic diagram of the water distribution pipe adjusting mechanism structure of the present application.

[0035] Figure 3 It is a schematic diagram of the first half gear and the second half gear structure of the present application.

[0036] Figure 4 Fig. 1 is a schematic diagram of the radial section structure of the water distribution pipe of the present application.

[0037] Figure 5 Fig. 2 is a schematic diagram of the anti-blocking mechanism structure of the present application.

[0038] Figure 6 Fig. 3 is an axial view of the water distribution pipe of the present application.

[0039] Figure 7 Fig. 4 is an axial view of the reset mechanism of the present application.

[0040] Figure 8 Fig. 5 is a schematic diagram of the top view structure of the anoxic tank of the present application.

[0041] In the figure: aerobic tank 1, anoxic tank 2, sewage pump 3, fixed conveying pipe 4, movable conveying pipe 5, shunt pipe 6, flow regulating valve 7, water distribution pipe 8, water distribution hole 9, water distribution pipe adjusting mechanism 10, motor 11, driving shaft 12, first half gear 13, 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 joint 28. DETAILED DESCRIPTION

[0042] Example 1:

[0043] As Figure 1 In the present application, an anoxic tank mixing and stirring system for use in the biochemical system of a sewage treatment plant comprises a fixed conveying pipe 4, the input end of which is connected to a sewage pump 3 in an aerobic tank 1, and the output end of which extends above an anoxic tank 2 and is connected to a movable conveying pipe 5 that is vertically downward, the movable conveying pipe 5 is movably connected to the fixed conveying pipe 4 through a joint, and the lower end of the movable conveying pipe 5 extends to a position close to the bottom of the anoxic tank 2, and the lower end of the movable conveying pipe 5 is provided with a horizontal water distribution pipe 8.

[0044] The water distribution pipe 8 is provided with a plurality of water distribution holes 9.

[0045] In a preferred embodiment, the fixed conveying pipe 4 is provided with a shunt pipe 6, and the shunt pipe 6 is provided with a flow regulating valve 7.

[0046] The shunt pipe 6 is located in the aerobic tank 1.

[0047] By adjusting the flow regulating valve 7 on the shunt pipe 6, the flow and pressure in the fixed conveying pipe 4 are adjusted, and the shunted flow is returned to the aerobic tank 1.

[0048] Example 2:

[0049] Combination Figure 2 , 3 As shown, based on Embodiment 1, the movable conveying pipeline 5 is further provided with a water distribution pipe adjustment mechanism 10;

[0050] The water distribution pipe adjustment mechanism 10 includes a motor 11 installed on the top of the pool wall between the aerobic pool 1 and the anoxic pool 2. The motor 11 drives the shaft upward and is connected to a vertical active rotating shaft 12. The upper end of the active rotating shaft 12 is provided with a first half gear 13. An outer sleeve shaft 14 is sleeved on the outside of the active rotating shaft 12, and a second half gear 15 is provided on the outer sleeve shaft 14.

[0051] The movable conveying pipe 5 is provided with two driven gears 16, one above the other. The two driven gears 16 are respectively set at the same horizontal height and mesh with the first half gear 13 and the second half gear 15.

[0052] In a preferred embodiment, a driven bevel gear 17 is also provided on the driving shaft 12 and the outer shaft 14 respectively, and the two driven bevel gears 17 are connected by an axially horizontal intermediate bevel gear 18 to form a bevel gear pair;

[0053] The intermediate bevel gear 18 is fixed to the top of the pool wall between the aerobic pool 1 and the anoxic pool 2 by a support rod.

[0054] Preferred solutions include Figure 4 In this process, there are two water distribution pipes 8. The lower end of the movable conveying pipe 5 is provided with a tee 28. One end of the two water distribution pipes 8 is connected to the tee 28, and the other end is provided with a detachable plug 19.

[0055] Preferred solutions include Figure 8 In the process, the active delivery pipe 5 is located in one corner of the anoxic pool 2, and the two water distribution pipes 8 are set at a 45° angle on the horizontal plane.

[0056] Example 3:

[0057] Combined with appendix Figures 5-7 As shown, based on Embodiment 1, the water distribution pipe 8 is also provided with an anti-blocking mechanism 20;

[0058] The anti-blocking mechanism 20 includes a main shaft 21. Multiple arc-shaped water distribution hole baffles 22 are fixed on the outer wall of the main shaft 21 by a support rod. 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.

[0059] In a preferred embodiment, the anti-blocking mechanism 20 further includes a reset mechanism 23 disposed at one end of the main shaft 21;

[0060] The reset mechanism 23 comprises an outer fixed cylinder 24 and an inner movable cylinder 25, a torsional spring 27 is arranged in the gap between the outer fixed cylinder 24 and the inner movable cylinder 25, and a plurality of inclined blades 26 are uniformly arranged in the circumferential direction between the end of the main shaft 21 and the inner wall of the inner movable cylinder 25;

[0061] The outer fixed cylinder 24 is fixedly connected with the inner wall of the water distribution pipe 8.

[0062] In the preferred scheme, the anti-blocking mechanism 20 is arranged at the input end of the water distribution pipe 8.

[0063] Embodiment 4:

[0064] Based on the operation method of the mixed stirring system for the anoxic tank in the biochemical system of the sewage treatment plant described in the above embodiments, the operation method comprises the following steps:

[0065] 1) Start the sewage pump 3, and the sewage pump 3 inputs the mud-water mixture in the anoxic tank 2 into the fixed conveying pipe 4;

[0066] 2) The flow and pressure of the mud-water mixture in the fixed conveying pipe 4 are realized by adjusting the opening degree of the flow regulating valve 7 on the shunt pipe 6;

[0067] 3) The mud-water mixture is input into the movable conveying pipe 5 from the fixed conveying pipe 4, and finally output to the anoxic tank 2 through the water distribution holes 9 on the water distribution pipes 8, so as to stir the sludge in the anoxic tank 2;

[0068] In the above step 1), the motor 11 is started at the same time, so that the driving shaft 12 and the sleeve shaft 14 are coaxially and reversely rotated under the action of the bevel gear pair, and the movable conveying pipe 5 drives the two water distribution pipes 8 to repeatedly rotate in the clockwise and counterclockwise directions through the alternating meshing of the first half gear 13 and the driven gear 16, the second half gear 15 and the driven gear 16;

[0069] In the above step 3), when the water flow enters the water distribution pipe 8, the water flow impacts the inclined blades 26 and drives 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 is opened;

[0070] When the sewage pump 3 is stopped, the water flow stops impacting the anti-blocking mechanism 20, and under the action of the torsional spring 27, the anti-blocking mechanism 20 reversely rotates to block the water distribution hole 9 by the arc-shaped water distribution hole baffle 22.

[0071] The above scheme disclosed in the application can eliminate the defects caused by air stirring, replace the air stirring with a new stirring mode, stir the anoxic tank and the anaerobic tank, fully mix the sludge and sewage in the water, and prevent the activated sludge from precipitating in the anoxic tank and the anaerobic tank.

[0072] The submerged sewage pump 3 transports the nitrification liquid reflux or sludge reflux in the biochemical system to the water distribution pipe through the conveying pipe when working, and the submerged sewage pump 3 increases the pressure of the transported water flow to form a pressurized water flow, the pressurized water flow is sprayed through the water distribution holes to form a hydraulic impact, the impact on the sludge deposited on the bottom of the pool drives the water in the pool, plays a stirring role, and makes the sludge and sewage fully mixed.

[0073] The overall structure is also used for nitrification liquid reflux or sludge reflux in the sewage treatment system, and the nitrification liquid or sludge mixed liquid is refluxed in and out of the biochemical system through the set of devices, the in-out reflux water volume is uniformly distributed to the pool through the holes of the steel pipe, and the reflux sludge and nitrification liquid also fully contact with the sludge mixed liquid in the water due to the hydraulic impact, thereby increasing the sewage treatment effect.

Claims

1. A stirring system for a biochemical system, comprising a fixed conveying pipe (4), characterized in that: The input end of the fixed conveying pipe (4) is connected to the submersible pump (3) in the aerobic tank (1). The output end of the fixed conveying pipe (4) extends to the top of the anoxic tank (2) and is connected to a vertically downward movable conveying pipe (5). The movable conveying pipe (5) is movably connected to the fixed conveying pipe (4) through a joint. The lower end of the movable conveying pipe (5) extends to a position close to the bottom of the anoxic tank (2), and the lower end of the movable conveying pipe (5) is provided with a horizontal water distribution pipe (8). The water distribution pipe (8) is provided with multiple water distribution holes (9); The water distribution pipe (8) is also equipped with an anti-blocking mechanism (20); The anti-blocking mechanism (20) includes a main shaft (21). Multiple arc-shaped water distribution hole baffles (22) are fixed on the outer wall of the main shaft (21) by a support rod. 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). The anti-blocking mechanism (20) also 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). Multiple inclined blades (26) are evenly distributed in the circumference 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); The anti-blocking mechanism (20) is located at the input end of the water distribution pipe (8).

2. The stirring system of a biochemical system according to claim 1, characterized in that: A diversion pipe (6) is provided on the fixed conveying pipeline (4), and a flow regulating valve (7) is provided on the diversion pipe (6). The diversion pipe (6) is located inside the aerobic tank (1).

3. The stirring system of a biochemical system according to claim 2, characterized in that: The active conveying pipeline (5) is also equipped with a water distribution pipe adjustment mechanism (10); The water distribution pipe adjustment mechanism (10) includes a motor (11) installed on the top of the pool wall between the aerobic pool (1) and the anoxic pool (2). The motor (11) drives the shaft upward and is connected to a vertical active rotating shaft (12). The upper end of the active rotating shaft (12) is provided with a first half gear (13). An outer sleeve shaft (14) is sleeved on the outside of the active rotating shaft (12). A second half gear (15) is provided on the outer sleeve shaft (14). The movable conveying pipe (5) is provided with two driven gears (16), one above the other. The two driven gears (16) are respectively set at the same horizontal height and mesh with the first half gear (13) and the second half gear (15); The driving shaft (12) and the outer shaft (14) are each provided with a driven bevel gear (17), and the two driven bevel gears (17) are connected 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) by a support rod.

4. The stirring system of a biochemical system according to claim 3, characterized in that: The water distribution pipe (8) consists of two pipes. The lower end of the movable conveying pipe (5) is provided with a tee (28). One end of the two water distribution pipes (8) is connected to the tee (28), and the other end is provided with a detachable plug (19).

5. The stirring system of a biochemical system according to claim 4, characterized in that: The active delivery pipe (5) is located in one corner of the anoxic pool (2), and the two water distribution pipes (8) are set at a 45° angle on the horizontal plane.

6. The method for operating the stirring system of a biochemical system according to claim 5, characterized in that... Includes the following steps: 1) Start the submersible sewage pump (3), and the submersible sewage pump (3) will input the mud-water mixture in the aerobic tank (1) into the fixed delivery pipeline (4). 2) Adjust the flow rate and pressure of the mud-water mixture in the fixed conveying pipe (4) by adjusting the opening of the flow regulating valve (7) on the diversion pipe (6); 3) The mud-water mixture is fed into the mobile conveying pipe (5) through the fixed conveying pipe (4) and finally output to the anoxic tank (2) through the water distribution hole (9) on the water distribution pipe (8) to stir the sludge in the anoxic tank (2); In step 1) above, the motor (11) is started at the same time, so that the active shaft (12) and the outer shaft (14) rotate in opposite directions on the same axis under the action of the bevel gear pair. Combined with the alternating meshing of the first half gear (13) and the driven gear (16), and the second half gear (15) and the driven gear (16), the movable conveying pipe (5) drives the two water distribution pipes (8) to rotate repeatedly in the clockwise and counterclockwise directions. In step 3) above, when the water flows into the water distribution pipe (8), the water flow impacts the inclined blade (26) and drives the anti-blocking mechanism (20) to rotate axially, causing the arc-shaped water distribution hole baffle (22) to rotate and the water distribution hole (9) to open. When the submersible pump (3) stops, the water flow stops impacting the anti-blocking mechanism (20). Under the action of the torsion spring (27), the anti-blocking mechanism (20) rotates in the opposite direction until the arc-shaped water distribution hole baffle (22) blocks the water distribution hole (9).

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