Assembly type sedimentation tank and aerobic tank for biochemical treatment

Abstract

The utility model discloses an assembly type sedimentation tank and an aerobic tank for biochemical treatment, and belongs to the technical field of environment-friendly sewage treatment. The device comprises a tank body, a mud bucket, an inclined pipe and a water outlet pipe, an installation support is arranged at the top of the tank body, an inclined pipe support is arranged in the tank body, the inclined pipe is installed on the inclined pipe support, the bottom in the mud bucket is connected with a mud discharge pipe branch pipe, the mud discharge pipe branch pipe is connected with a mud discharge pipe, and the water inlet pipe is arranged at the bottom of the mud bucket. The inner wall of the pool body is provided with a water outlet groove, the top of the water outlet groove is provided with an overflow weir, and the water outlet groove is connected with a water outlet pipe. The secondary sedimentation tank can be used as a secondary sedimentation tank for biochemical effluent, has sedimentation and sludge discharge functions, is stable in sedimentation effect, can realize modular production and assembly of the sedimentation tank, is convenient to mount and maintain, and reduces the cost and the construction time.

Description

Technical Field

[0001] The utility model belongs to the technical field of environmental protection sewage treatment, and particularly relates to an assembled sedimentation tank and an aerobic tank for biochemical treatment. Background Technique

[0002] When the activated sludge method is adopted for biochemical treatment, the sedimentation tank is a structure for sedimentation and separation of activated sludge in water. The sedimentation tank after biochemical treatment is also called the secondary sedimentation tank. After the sewage is biochemically treated, it must pass through the secondary sedimentation tank for mud-water separation. The separated sludge is returned to the biochemical tank, and the clarified effluent enters the next process section. The working performance of the secondary sedimentation tank has a direct impact on the operation effect of the activated sludge system.

[0003] In the reconstruction or expansion project of sewage treatment, when reconstructing or expanding the sedimentation tank, it is necessary to empty the tank body. Moreover, the sedimentation tank is generally built in the form of a concrete structure, with a long construction period, large workload, inconvenient construction, and each sedimentation tank needs to be designed and constructed separately, and modular production and assembly cannot be realized. Content of the Utility Model

[0004] In order to solve the problems raised in the above background technique, the purpose of the utility model is to provide an assembled sedimentation tank and an aerobic tank for biochemical treatment, which realize the modular production and assembly of the sedimentation tank through the assembled sedimentation tank, and at the same time ensure the treatment effect and sludge return function of the sedimentation tank, with convenient equipment installation and maintenance and reliable operation.

[0005] In order to solve the above technical problems, the technical scheme adopted by the utility model is as follows:

[0006] An assembled sedimentation tank for biochemical treatment, comprising a tank body, a sludge hopper, inclined tubes and a water outlet pipe. The water outlet pipe is arranged at the upper part of the tank body, the inclined tubes are arranged in the middle of the tank body, and the sludge hopper is arranged at the bottom of the tank body; the sludge obtained after the inclined tubes filter the sewage is deposited in the sludge hopper, and the clear water is discharged from the tank body through the water outlet pipe to realize mud-water separation.

[0007] Further, an installation bracket is arranged at the top of the tank body, and the installation bracket is fixed on the installation beam.

[0008] Further, a water diversion tank and a sludge discharge pump are installed at the top of the tank body. The outlet of the water diversion tank is connected to the inlet of the sludge discharge pump; a water replenishing pipe and an exhaust pipe are arranged at the top of the water diversion tank.

[0009] Further, a branch sludge discharge pipe is connected to the inner bottom of the sludge hopper, and multiple groups of branch sludge discharge pipes are jointly connected to the sludge discharge pipe. The outlet of the sludge discharge pipe is connected to the inlet of the water diversion tank.

[0010] Further, a bottom support is provided at the outer end of the bottom of the sludge hopper, and a water inlet pipe is fixedly provided on the bottom support, and the water inlet pipe is arranged along the bottom of the sludge hopper.

[0011] Further, the inlet of the water inlet pipe is horizontally arranged along the outer wall of the bottom of the sludge hopper, and the outlet of the water inlet pipe is vertically upward arranged along the inner wall of the bottom of the sludge hopper.

[0012] Further, the inclined tubes are installed on the inclined tube support inside the pool body, the inclination angle of the inclined tubes is 60°, the vertical height of the inclined tubes is 0.8 - 1.0 m, the water depth above the inclined tubes is 0.5 - 1.0 m, and the height difference between the bottom of the inclined tubes and the top of the sludge hopper is 0.5 - 1.0 m.

[0013] Further, a water outlet trough is connected to the side of the water outlet pipe connected to the pool body, and an overflow weir is installed on the top of the water outlet trough.

[0014] Further, the included angle between the inclined wall of the sludge hopper and the horizontal plane is 60°, and the hydraulic retention time of the sludge hopper is 5 - 10 min.

[0015] Further, the installation support is fixed on the pool body by bolts and can be installed or disassembled from the pool body according to actual needs; installation holes are provided at different heights on the installation support, and the installation support is fixed on the installation beam through the installation holes and bolts, and the installation height of the sedimentation tank can be adjusted through the installation holes. The sedimentation tank is arranged in multiple groups, and a single pool body is a cuboid structure with an aspect ratio of 3:1, and the surface hydraulic load of a single pool body is 0.5 - 2.0 m 3 / (m 2 ·h).

[0016] Further, an aerobic tank adopts the prefabricated sedimentation tank for biochemical treatment described above, and multiple groups of sedimentation tanks are arranged in the aerobic tank.

[0017] Compared with the prior art, the advantages of the present utility model are as follows:

[0018] (1) In the present utility model, the pool body and the installation beam are connected through the installation support, which is convenient for installation and adjustment of the installation height. The sludge discharge pump and the water diversion tank are integrated on the installation support, which is convenient for assembly and maintenance. The internal structure of the sedimentation tank is simple, and multiple groups of water inlet pipes are used for bottom water inlet, with uniform water replenishment and stable operation.

[0019] (2) In the present utility model, an overflow weir and a water outlet trough are ingeniously arranged in the clear water discharge section. When the water level exceeds the overflow weir, the water will slowly overflow from above the overflow weir and flow into the water outlet trough. After the buffering effect of the water outlet trough, it will finally pass through the water outlet pipe smoothly and discharge from the pool body, effectively avoiding the direct discharge of clear water from the pool body, resulting in unstable water pressure and triggering accidents.

[0020] (3) In the present utility model, a water inlet baffle with a height 5 - 10 cm higher than the outlet of the water inlet pipe is arranged beside the outlet of the water inlet pipe. On the one hand, it can play a role in guiding the flow, promoting more sewage to pass upward through the filtration of the inclined tubes; on the other hand, it can prevent the sedimented sludge from blocking the outlet of the water inlet pipe.

[0021] (4) The present utility model can continuously achieve the separation of mud and water, and can realize modular production and assembly. Description of the Drawings

[0022] Figure 1 It is a schematic structural diagram of an assembled sedimentation tank for biochemical treatment.

[0023] Figure 2 It is a schematic top view structural diagram of the assembled sedimentation tank.

[0024] Figure 3 It is a schematic structural diagram of the water inlet pipe.

[0025] Figure 4 It is a schematic structural diagram of the sludge discharge pipe.

[0026] Figure 5 It is a schematic installation diagram of the assembled sedimentation tank.

[0027] The reference numerals are: 1 - tank body; 2 - sludge hopper; 3 - water inlet pipe; 4 - water inlet baffle; 5 - inclined tube; 6 - sludge discharge pipe; 7 - overflow weir; 8 - water outlet trough; 9 - water outlet pipe; 10 - installation bracket; 11 - bottom bracket; 12 - sludge discharge pipe branch; 13 - inclined tube support; 14 - water diversion tank; 15 - sludge discharge pump; 16 - make-up water pipe; 17 - installation beam; 18 - exhaust pipe. Detailed Embodiments

[0028] The following further clarifies the present utility model in conjunction with specific embodiments. The embodiments are implemented on the premise of the technical solution of the present utility model. It should be understood that these embodiments are only used to illustrate the present utility model and not to limit the scope of the present utility model.

[0029] As Figures 1-5 shown, an assembled sedimentation tank for biochemical treatment includes a tank body 1, a sludge hopper 2 and inclined tubes 5; an installation bracket 10 is provided at the top of the tank body 1, a water diversion tank 14 and a sludge discharge pump 15 are installed at the top of the tank body 1, an inclined tube support 13 is arranged inside the tank body 1, the inclined tubes 5 are installed on the inclined tube support 13, the bottom of the sludge hopper 2 is connected to a sludge discharge pipe branch 12, the sludge discharge pipe branch 12 is connected to a sludge discharge pipe 6, the water inlet pipe 3 is arranged at the bottom of the sludge hopper 2, a water inlet baffle 4 is provided at the outlet of the water inlet pipe 3, a water outlet trough 8 is installed on the inner wall of the tank body 1, an overflow weir 7 is installed at the top of the water outlet trough 8, the water outlet trough 8 is connected to a water outlet pipe 9, and the installation bracket 10 is fixed on an installation beam 17.

[0030] The water outlet tank 8 and the water inlet baffle 4 are located on both sides of the central plane of the tank body 1. The two ends of the water inlet baffle 4 and the water outlet tank 8 are fixed on the two end faces of the tank body 1. A water outlet pipe 9 is connected to the side surface of the water outlet tank 8, and the water outlet pipes 9 of multiple sedimentation tanks are connected into a main pipe.

[0031] An installation bracket 10 is connected to the top of the tank body 1. The installation bracket 10 is fixed on the tank body 1 by bolts and can be disassembled from the tank body 1. Installation holes are provided at different heights on the installation bracket 10. The installation bracket 10 is fixed on the installation beam 17 through the installation holes and bolts. The installation height of the sedimentation tank can be adjusted through the installation holes. The sedimentation tanks are arranged in multiple groups. A single tank body 1 is of a cuboid structure, and the aspect ratio of length to width is 3:1. The surface hydraulic load of a single tank body 1 is 0.5 - 2.0m 3 / (m 2 ·h).

[0032] A bottom bracket 11 is installed at the bottom of the sludge hopper 2. The water inlet pipe 3 is fixed on the bottom bracket 11. The water inlet pipe 3 is arranged along the inner inclined wall at the bottom end of the sludge hopper 2. The inlet of the water inlet pipe 3 is arranged horizontally along the outer wall at the bottom of the sludge hopper 2, and the outlet of the water inlet pipe 3 is arranged vertically upward along the inner wall of the sludge hopper 2. The included angle between the inclined wall of the sludge hopper 2 and the horizontal plane is 60°. The hydraulic retention time of the sludge hopper 2 is 5 - 10min.

[0033] The outlet height of the water inlet pipe 3 is 5 - 10cm lower than the top height of the water inlet baffle 4. On the one hand, it can play a role in guiding the flow, promoting more sewage to pass upward through the filtration of the inclined tube 5; on the other hand, it can prevent the deposited sludge from blocking the outlet of the water inlet pipe 3.

[0034] The water inlet pipes 3 are arranged in multiple groups in parallel, which can effectively increase the water inlet flow rate and improve the operation efficiency of the entire process. Each group of water inlet pipes 3 is parallel to each other, and the flow velocity inside a single group of water inlet pipes 3 is 0.02 - 0.03m / s.

[0035] The inlet of the sludge discharge pipe 6 consists of multiple sludge discharge pipe branches 12. The outlet of the sludge discharge pipe 6 is connected to the inlet of the water diversion tank 14. A water replenishing pipe 16 and an exhaust pipe 18 are provided at the top of the water diversion tank 14. The outlet of the water diversion tank 14 is connected to the inlet of the sludge discharge pump 15.

[0036] The sludge discharge pipe 6 outside the tank body 1 is arranged on the side surface of the tank body 1. An electric valve is installed on the water replenishing pipe 16 at the top of the water diversion tank 14. A liquid level gauge is installed on the water diversion tank 14. Before starting the sludge discharge pump 15, the electric valve is opened to replenish water into the water diversion tank 14, and when the set liquid level is reached, the electric valve is closed to stop water replenishment.

[0037] The sludge discharge pump 15 operates continuously. The flow rate Q of the sludge discharge pump 15 is determined according to the volume V of the sludge hopper 2 and the hydraulic retention time HRT, and Q = V / HRT.

[0038] Further, as a preference of this embodiment, the water replenishing pipe 16 is connected to the tap water pipe, the outlet of the exhaust pipe 18 is connected to the top of the sedimentation tank, and a positive and negative pressure gauge is installed on the top of the water diversion tank 14 to monitor the pressure change in the water diversion tank 14.

[0039] The inclination angle of the inclined tube 5 is 60°, the vertical height of the inclined tube 5 is 0.8 - 1.0 m, the water depth above the inclined tube 5 is 0.5 - 1.0 m, and the height difference between the bottom of the inclined tube 5 and the top of the sludge hopper 2 is 0.5 - 1.0 m.

[0040] The working principle of the present utility model is as follows: The sewage obtained from the biochemical treatment of activated sludge is introduced into the pool body 1 from the water inlet pipe 3. Due to the guiding effect of the water inlet baffle 4, most of the sewage will continue to flow upward through the inclined tube 5. The inclined tube 5 will prevent the sludge in the sewage from passing through, causing the sludge in the sewage to settle to the sludge hopper 2 under the action of gravity, while the clear water will freely pass through the inclined tube 5 and reach above the inclined tube 5. As the process proceeds, the water level above the inclined tube 5 gradually rises. When the water level exceeds the overflow weir 7, the water will slowly overflow from above the overflow weir 7 and flow into the water outlet trough 8. After the buffering effect of the water outlet trough 8, it finally discharges from the water outlet pipe 9 out of the pool body 1 and enters the next process section.

[0041] The sludge deposited in the sludge hopper 2 gradually accumulates as the process proceeds. When it accumulates to a certain extent, the electric valve on the water replenishing pipe 16 at the top of the water diversion tank 14 is opened to replenish water into the water diversion tank 14. When the set liquid level is reached, the electric valve is closed to stop water replenishment. At this time, the sludge discharge pump 15 is started, and the sludge in the sludge hopper 2 is pumped from the sludge discharge pipe 6 to the water diversion tank 14, and then discharged into the sludge discharge pump 15 through the outlet of the water diversion tank 14. Finally, the separation of sludge and water is achieved through the sludge discharge pump 15. The separated sludge continues to flow back to the biochemical pool for the next process section.

[0042] By adopting the present utility model, the sedimentation tank can be installed as a device on the top of the aerobic tank, which is convenient for the transformation and installation of the biochemical treatment system. The sedimentation tank can adopt a modular design, and the number of sedimentation tanks can be selected according to requirements. The internal structure of the sedimentation tank is simple, which is convenient for maintenance and repair.

[0043] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. An assembled sedimentation tank for biochemical treatment, characterized in that: The invention comprises a tank body (1), a mud hopper (2), an inclined pipe (5) and a water outlet pipe (9), wherein the water outlet pipe (9) is arranged at the upper part of the tank body (1), the inclined pipe (5) is arranged at the middle part of the tank body (1), and the mud hopper (2) is arranged at the bottom of the tank body (1); the mud obtained after the sewage is filtered by the inclined pipe (5) is deposited in the mud hopper (2), and the clean water is discharged from the tank body (1) through the water outlet pipe (9), thereby achieving mud and water separation.

2. The assembled sedimentation tank for biochemical treatment according to claim 1, characterized in that: A mounting bracket (10) is provided on the top of the pool body (1), and the mounting bracket (10) is fixed on a mounting beam (17).

3. The assembled sedimentation tank for biochemical treatment according to claim 1, characterized in that: A water diversion tank (14) and a mud discharge pump (15) are installed on the top of the pool body (1), and the outlet of the water diversion tank (14) is connected to the inlet of the mud discharge pump (15); a water supply pipe (16) and an exhaust pipe (18) are provided on the top of the water diversion tank (14).

4. The assembled sedimentation tank for biochemical treatment according to claim 1, characterized in that: The bottom of the mud bucket (2) is connected to a mud discharge pipe branch (12), and a plurality of mud discharge pipe branch pipes (12) are connected to a mud discharge pipe (6) together, and the outlet of the mud discharge pipe (6) is connected to the inlet of a water diversion tank (14).

5. The assembled sedimentation tank for biochemical treatment according to claim 1, characterized in that: A bottom bracket (11) is provided at the outer end of the bottom of the mud bucket (2), a water inlet pipe (3) is fixedly provided on the bottom bracket (11), and the water inlet pipe (3) is arranged along the bottom of the mud bucket (2).

6. The assembled sedimentation tank for biochemical treatment according to claim 5, characterized in that: The inlet of the water inlet pipe (3) is arranged horizontally along the outer wall of the bottom of the mud bucket (2), and the outlet of the water inlet pipe (3) is arranged vertically upward along the inner wall of the bottom of the mud bucket (2).

7. The assembled sedimentation tank for biochemical treatment according to claim 1, characterized in that: The inclined pipe (5) is installed on an inclined pipe support (13) inside the pool body (1), the inclined pipe (5) has an inclination angle of 60°, the vertical height of the inclined pipe (5) is 0.8-1.0 m, the water depth above the inclined pipe (5) is 0.5-1.0 m, and the height difference between the bottom of the inclined pipe (5) and the top of the mud bucket (2) is 0.5-1.0 m.

8. The assembled sedimentation tank for biochemical treatment according to claim 1, characterized in that: The side of the water outlet pipe (9) connected to the pool body (1) is connected to a water outlet trough (8), and an overflow weir (7) is installed on the top of the water outlet trough (8).

9. The assembled sedimentation tank for biochemical treatment according to claim 1, characterized in that: The angle between the inclined wall of the mud bucket (2) and the horizontal plane is 60°, and the hydraulic retention time of the mud bucket (2) is 5 to 10 minutes.

10. An aerobic pool, using the assembled sedimentation tank for biochemical treatment according to any one of claims 1 to 9, characterized in that: Multiple groups of sedimentation tanks are arranged in the aerobic pool.

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