Filler dredging device

Abstract

The utility model provides a filler dredging device and belongs to the field of environmental protection and sewage treatment. The filler dredging device comprises a guide wall, an effluent intercepting device and a dredging plug flow pump; a dredging and flow pushing hole is formed in the flow guide wall at the upstream of the effluent intercepting device, and a dredging and flow pushing pump used for enabling sewage in the tail channel and the biological suspended filler to flow back to the head channel together is arranged on the dredging and flow pushing hole in a matched manner. According to the utility model, the problems of blockage and fluidization of the biological suspended filler in the sewage biochemical treatment tank are solved at low cost, and the flow state is uniform. In the sewage biochemical treatment tank corresponding to the filler dredging device, the biological suspended filler uniformly circulates in the tank body except the drainage cavity, and an additional communication channel of the biological suspended filler from the vicinity of the water outlet to the vicinity of the water inlet does not need to be established. The overall operation cost of the sewage biochemical treatment pond corresponding to the filler dredging device is low.

Description

Technical Field

[0001] The utility model relates to the fields of environmental protection and sewage treatment, and in particular to a filler dredging device. Background Art

[0002] MBBR (Moving Bed Biofilm Reactor) is a process package commonly used in the aerobic tanks of wastewater treatment plants. The MBBR process package for wastewater biochemical treatment systems involves placing a biofilm-filled material (BFM) at a specific fill ratio in water. The biofilm is attached to the BFM, which contains microorganisms, mostly aerobic bacteria. The BFM has a density similar to that of water and flows with the water flow. During this flow, the microorganisms on the BFM purify the wastewater. Sewage continuously flows from the inlet into the biochemical tank, where it flows along a guide path for a period of time before being discharged from the outlet. The time between the inlet and outlet is called the residence time, which is the time the BFM takes to function. During this residence time, the wastewater is decomposed and purified by the biofilm on the BFM. Therefore, the BFM needs to remain in the aerobic tank in a continuous cycle—that is, it needs to return from the outlet to the inlet—to ensure the microorganisms are fully active and to ensure effective treatment throughout the aerobic tank, avoiding wasted space and substandard wastewater treatment.

[0003] In the existing process route technology, in order to maintain the continuous inflow and outflow of sewage and the circulation flow of biological suspended fillers, for example, the filler interception and drainage system disclosed in the invention patent CN201510649300.7 is adopted. Among them, a diversion wall is set in the length direction of the sewage treatment pool. The front end of the diversion wall is in contact with the pool wall, and there is a gap between the rear end and the pool wall. One side of the diversion wall is the water inlet, and the other side is the water outlet. There is an interception wall in front of the outlet. A drainage hole is provided in the middle of the interception wall. The drainage hole is covered with a cylindrical interception net. A discharge trough is provided at the top of the interception wall. A through-wall pump is installed in the discharge trough. The rear part of the interception wall is divided into upper and lower parts by a partition. The upper part is a filler platform. The through-wall pump pushes the filler and water to the filler platform. The lower part is a drainage cavity. The sewage enters the drainage cavity and is then discharged from the sewage treatment pool. The diversion wall at the filler platform is provided with a notch, so that the filler platform and one end of the water inlet are connected to form a circulation in the pool. This invention features a rational flow design, preventing localized blockages, saving materials, and reducing costs. The slow flow prevents dead-end accumulation and reduces operating costs, making it suitable for the drainage of fillers in sewage treatment. Furthermore, invention patent CN201510652190.X discloses a low-energy filler interception and drainage system with a similar structure to CN201510649300.7.

[0004] That is to say, both solutions are to set up a diversion wall in the sewage treatment pool, and the diversion wall makes the sewage flow continuously around it as a whole. Generally, a special submersible flow propeller is used to push the water flow or rely on micro-dynamic water flow. Since the density of the biological suspended filler is close to the density of water, the biological suspended filler will flow with the water flow. In order to intercept the biological suspended filler, a plate interception net or a cylindrical interception net is generally set at the outlet. The interception net is generally made of metal material or composite material, and is provided with drainage holes with a certain opening rate. The diameter of the drainage hole is smaller than the diameter of the biological suspended filler, so that the sewage is discharged through the drainage hole, and the biological suspended filler is intercepted. The intercepted biological suspended filler moves with the direction of the water flow in the pool. A discharge trough and a through-wall pump installed in the discharge trough are provided at the upper end of the interception wall and the interception net, which are used for the biological suspended filler and sewage to enter the back of the interception wall together. However, when using the above-mentioned interception and drainage system, the following shortcomings often arise:

[0005] 1. The biological suspended filler will flow to the interception net along the direction of water flow, causing the biological suspended filler to accumulate, thereby causing the drainage holes of the interception net to be blocked. What's worse, it can cause the interception net to be subjected to excessive force, causing deformation and damage to the interception net.

[0006] 2. In order to avoid the accumulation of biological suspended fillers at the interception net, it is generally necessary to use a higher-power propeller to increase the moving speed of the biological suspended fillers in the sewage treatment tank; this can easily cause serious wear between the biological suspended fillers and the wall, and between the biological suspended fillers and the blades of the through-wall pump, and even damage the equipment; and the use of high-power submersible propellers leads to high energy consumption and increased operating costs.

[0007] 3. If plate-type interception screens are used in sewage treatment tanks, they have low bending and tensile strength and are easily deformed. Therefore, a lower through-hole velocity must be used during design. This results in a larger interception screen area and higher costs. Therefore, the plate-type interception and drainage system has high energy consumption and poor reliability, making it difficult to meet the requirements of the MBBR treatment process.

[0008] Therefore, a new filler drainage device is needed in the art to solve the problem of easy accumulation of biological suspended fillers in biochemical treatment tanks in the prior art, thereby obtaining a filler drainage device that can fully meet the requirements of MBBR treatment process. Utility Model Content

[0009] The utility model provides a filler dredging device with low equipment loss and capable of solving the problem of biological suspended filler blockage in an aerobic pool.

[0010] Specifically, the utility model provides a filler diversion device, including a guide wall 2, a water outlet intercepting device 5, and a diversion and flow pump 6; the guide wall 2 is arranged in the pool body and is used to change and guide the direction of sewage flow, one end of which is connected to the pool wall of the pool body 1 and the other end is open to allow sewage and biological suspended filler 9 to pass through; the guide wall 2 is used to separate the head channel 3 and the tail channel 4 for sewage flow in the pool body; the water outlet intercepting device 5 is arranged downstream of the tail channel 4 and is connected to the guide wall 2 and the pool wall of the pool body 1, thereby allowing sewage to enter the drainage cavity 10 downstream thereof and being used to intercept the biological suspended filler 9 upstream thereof, and the drainage cavity 10 is provided with a water outlet 8; a diversion and flow hole is provided on the guide wall 2 upstream of the water outlet intercepting device 5, and a diversion and flow pump 6 is matched with the diversion and flow hole to return the sewage and biological suspended filler 9 in the tail channel 4 to the head channel 3; a water inlet 7 is provided upstream of the head channel 3.

[0011] In a specific embodiment, the water outlet intercepting device 5 is arranged to be perpendicular to the guide wall 2, and the pool body 1 is a rectangular structure.

[0012] In a specific embodiment, a cylindrical interception net is provided on the water outlet interception device 5 .

[0013] In a specific embodiment, the diversion and propelling holes and the diversion and propelling pump 6 on the guide wall 2 are arranged at a position 0.3 to 1 m upstream of the upstream end surface of the cylindrical intercepting network.

[0014] In a specific embodiment, there are multiple diversion and thrust flow holes and multiple diversion and thrust flow pumps 6 on the diversion wall 2 .

[0015] In a specific embodiment, the diversion and propelling flow holes and the diversion and propelling flow pump 6 on the guide wall 2 are both arranged at a position below 0.5 m below the liquid surface of the pool body 1 .

[0016] The beneficial effects of the present invention include at least: the present invention solves the clogging and fluidization problems of biological suspended fillers in sewage biochemical treatment tanks at a low cost, and its flow state is uniform, and there are no other obvious defects. In the present invention, the speed of the motor used to drive the drainage and thrust pump is controllable, which can effectively prevent the biological suspended fillers from being damaged by collision during the backflow process. In the present invention, the overall water flow in the sewage biochemical treatment tank corresponding to the filler drainage device is slow, there will be no rapid flow field, no dead corner accumulation, no short-flow phenomenon, and its water outlet is uniform. In the sewage biochemical treatment tank corresponding to the filler drainage device of the present invention, the biological suspended filler circulates evenly in the tank body 1 except for the drainage chamber 10, and there is no need to establish an additional connecting channel for the biological suspended filler from the vicinity of the water outlet to the vicinity of the water inlet. The overall operating cost of the sewage biochemical treatment tank corresponding to the filler drainage device of the present invention is low. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the structure of the sewage biochemical treatment tank and the filler drainage device described in the present invention when viewed from above.

[0018] Figure 2 This is a partial structural schematic diagram of the sewage biochemical treatment tank and filler drainage device described in the present invention in the main viewing direction.

[0019] The markings in the figure are: 1-tank body, 2-diversion wall, 3-first channel, 4-tail channel, 5-water outlet interception device, 6-drainage and thrust pump, 7-water inlet, 8-water outlet, 9-biological suspended filler, 10-drainage chamber. DETAILED DESCRIPTION

[0020] The present invention will be further described below with reference to the accompanying drawings.

[0021] like Figure 1 and Figure 2 As shown, the utility model provides a filler drainage device, including a guide wall 2, a water outlet intercepting device 5, and a drainage and propelling pump 6; the guide wall 2 is arranged in the pool body and is used to change and guide the direction of sewage flow, one end of which is connected to the pool wall of the pool body 1 and the other end is open to allow sewage and biological suspended filler 9 to pass through; the guide wall 2 is used to separate the head channel 3 and the tail channel 4 for sewage flow in the pool body; the water outlet intercepting device 5 is arranged downstream of the tail channel 4 and is connected to the guide wall 2 and the pool wall of the pool body 1, thereby allowing sewage to enter the drainage cavity 10 downstream thereof and is used to intercept the biological suspended filler 9 upstream thereof, and the drainage cavity 10 is provided with a water outlet 8; a drainage and propelling hole is provided on the guide wall 2 upstream of the water outlet intercepting device 5, and a drainage and propelling pump 6 for returning the sewage and biological suspended filler 9 in the tail channel 4 to the head channel 3 is matched on the drainage and propelling hole; a water inlet 7 is provided upstream of the head channel 3.

[0022] In the present invention, the drainage and plugging pump 6 can be a wall-penetrating pump consistent with that in the background art, or a different pump, as long as the effect described in the present invention can be achieved.

[0023] In this utility model, appropriately positioned drainage holes and drainage pumps are installed to allow the bio-suspended material trapped before the water outlet interception device to flow back from the tail channel to the head channel, thereby achieving in-tank circulation of the bio-suspended material. The uniformly refluxed bio-suspended material is dynamically and evenly distributed throughout the tank.

[0024] In the present invention, the impeller of the drainage plug flow pump is, for example, an MBBR-specific impeller cast from polyurethane material and aluminum alloy and coated with a wear-resistant layer.

[0025] like Figure 1 and Figure 2 As shown, sewage enters the tank through water inlet 7, bypasses the guide wall 2, circulates along the guide wall 2, and flows to the location of the water interception device 5 and drainage chamber 10. The sewage is then discharged outside the sewage biochemical treatment tank through water outlet 8. A diversion pump 6 on the guide wall 2 upstream of the water interception device 5 promptly returns sewage and suspended biomass from the tail channel 4 to the head channel 3, allowing the suspended biomass to circulate within the tank.

[0026] It will be easily understood by those skilled in the art that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A filler dredging device, characterized in that: It comprises a diversion wall (2), a water outlet interception device (5), and a diversion and flow pump (6); The guide wall (2) is arranged in the tank body and is used to change and guide the direction of sewage flow, one end of which is connected to the tank wall of the tank body (1) and the other end is open to allow sewage and biological suspended filler (9) to pass through; the guide wall (2) is used to separate the head channel (3) and the tail channel (4) for sewage flow in the tank body; The water outlet intercepting device (5) is arranged downstream of the tail channel (4) and is connected to the guide wall (2) and the pool wall of the pool body (1), thereby allowing sewage to enter the drainage cavity (10) downstream thereof and being used to intercept the biological suspended filler (9) upstream thereof, and the drainage cavity (10) is provided with a water outlet (8); a diversion flow hole is provided on the guide wall (2) upstream of the water outlet intercepting device (5), and a diversion flow pump (6) is provided on the diversion flow hole to return the sewage and the biological suspended filler (9) in the tail channel (4) to the head channel (3); and a water inlet (7) is provided upstream of the head channel (3).

2. The filler guiding device according to claim 1, characterized in that: The water outlet intercepting device (5) is arranged perpendicular to the guide wall (2), and the pool body (1) is in a rectangular structure.

3. The filler guiding device according to claim 2, characterized in that: The water outlet interception device (5) is provided with a cylindrical interception net.

4. The filler guiding device according to claim 3, characterized in that: The diversion and propelling holes and the diversion and propelling pump (6) on the diversion wall (2) are arranged at a position 0.3 to 1 m upstream of the upstream end surface of the cylindrical intercepting network.

5. The filler guiding device according to claim 1, characterized in that: There are multiple diversion and thrust flow holes and multiple diversion and thrust flow pumps (6) on the diversion wall (2).

6. The filler guiding device according to any one of claims 1 to 5, characterized in that: The diversion and propelling holes and the diversion and propelling pump (6) on the diversion wall (2) are both arranged at a position below 0.5 m below the liquid surface of the pool body (1).

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