Novel biological filter device

Abstract

The novel biological filter device comprises a filter and a return pipe, a sewage inlet is formed in one side wall of the filter, a water outlet and an air inlet are formed in the other side wall of the filter, an aeration port is formed in the upper surface of the bottom of the filter, and the return pipe is arranged above the filter. The side wall close to the water inlet end of the return pipe is communicated with the air inlet, a return pipe outlet of the return pipe is arranged above the position, close to the sewage inlet, of the filter tank, and filter material particles are arranged in the filter tank. According to the device disclosed by the utility model, proper filter materials are screened for biofilm formation and then float in water in the filter tank, so that the effects of removing COD and filtering are achieved; meanwhile, the aeration port at the bottom ensures that dissolved oxygen in water and the filter material are continuously suspended, and the return pipe near the drainage port forms negative pressure by blowing air to send the filter material back to the sewage inlet, so that the filter material is uniformly distributed, a good removal effect is achieved, a hardening effect caused by growth of microorganisms is effectively prevented, and the service life of the filter material is prolonged. And the problem that the device is easily blocked by filter material scraps can be avoided.

Description

Technical Field

[0001] The utility model belongs to the technical field of water treatment devices, and specifically relates to a novel biological filter device. Background Art

[0002] Aerated biological filter has the characteristics of small footprint, high organic load, strong impact resistance, good effluent quality, and low sludge production. It is one of the most widely used sewage deep treatment technologies, but it has limited effect on the macromolecular organic matter that is difficult to biodegrade in industrial wastewater. If the macromolecular organic matter is converted into small molecular substances by means of chemical oxidation at the front end, the biodegradability of the secondary effluent will be significantly improved. It is an important pre-treatment technology for biological treatment. Therefore, the current mainstream technology often uses biological filters and ozone catalytic oxidation devices to jointly treat wastewater.

[0003] At present, although there are many technologies to improve the existing process, they all adjust the air outlet and water outlet layout based on the basic structure of the existing filter tank, which cannot effectively prevent the compaction caused by microbial growth, and the filter material debris can easily clog the backwash device or the exhaust port. Utility Model Content

[0004] Technical problem solved: In view of the above technical problem, the utility model provides a novel biofilter device, which can avoid the compaction of filter materials and does not require backwashing, thus saving energy.

[0005] Technical solution: A new type of biological filter device, including a filter and a return pipe, a sewage inlet is provided on one side wall of the filter, a drain outlet and an air inlet are provided on the other side wall, an aeration port is provided on the bottom upper surface of the filter, the return pipe is arranged above the filter, and the side wall near the water inlet end of the return pipe is connected with the air inlet, the return pipe outlet of the return pipe is arranged above the filter near the sewage inlet, and filter particles are provided inside the filter.

[0006] Preferably, the sewage inlet and the drain outlet are respectively arranged on a set of parallel side walls of the filter tank, and the distance between the sewage inlet and the bottom of the filter tank is greater than the distance between the drain outlet and the bottom of the filter tank.

[0007] Preferably, the number of the aeration ports is at least sufficient to allow the bubbles to cover the bottom area of ​​the filter tank.

[0008] Preferably, the filter material particles are plastic particles or polyurethane sponge particles.

[0009] Preferably, the distance between the water inlet of the return pipe and the bottom of the filter tank is consistent with the distance between the filter material particles and the bottom of the filter tank.

[0010] Preferably, the angle between the air inlet and the water inlet of the return pipe is less than 90°.

[0011] Beneficial effects: The utility model device floats in the filter tank water after screening suitable filter media for biofilm formation. Sewage flows into the sewage inlet and passes through the filter media particles and is discharged from the drain outlet, during which it reacts with the filter media to achieve the effects of COD removal and filtration. At the same time, the aeration port at the bottom ensures that the dissolved oxygen in the water and the filter media are continuously suspended. The return pipe near the drain outlet forms a negative pressure by blowing air to send the filter media back to the sewage inlet, so that the filter media is evenly distributed, thereby achieving a good removal effect while effectively preventing the compaction caused by microbial growth, and avoiding the problem of filter media debris easily clogging the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural schematic diagram of a novel biological filter device of the utility model;

[0013] Serial numbers in the figure: 1, return pipe, 2, return pipe outlet, 3, filter tank, 4, sewage inlet, 5, filter material particles, 6, aeration port, 7, drain port, 8, return pipe inlet, 9, air inlet. DETAILED DESCRIPTION

[0014] The technical solution of the utility model is further described in detail below in conjunction with the accompanying drawings. Example 1

[0015] Reference Figure 1 A novel biological filter device comprises a filter tank 3 and a return pipe 1, a sewage inlet 4 is provided on one side wall of the filter tank 3, a drain port 7 and an air inlet 9 are provided on the side wall parallel to the threshold, and the distance between the sewage inlet 4 and the bottom of the filter tank 3 is greater than the distance between the drain port 7 and the bottom of the filter tank 3; an aeration port 6 is provided on the upper surface of the bottom of the filter tank 3, the return pipe 1 is arranged above the filter tank 3, the return pipe 1 is not more than 2 m above the water surface of the filter tank 3, the side wall of the return pipe 1 near the return pipe water inlet 8 is connected with the air inlet 9, the return pipe outlet 2 of the return pipe 1 is arranged above the filter tank 3 near the sewage inlet 4, and filter material particles 5 are provided inside the filter tank 3.

[0016] The number of the aeration ports 6 must at least be sufficient to allow the bubbles to cover the bottom area of ​​the filter tank 3 .

[0017] The filter material particles 5 are plastic particles or polyurethane sponge particles or other porous materials, which ensure that they can float in water after forming a biofilm.

[0018] The distance between the water inlet 8 of the reflux pipe and the bottom of the filter tank 3 is consistent with the distance between the filter material particles 5 and the bottom of the filter tank 3. The distance between the filter material particles 5 and the bottom of the filter tank 3 is adjusted by the gas flow rate of the aeration port 6. The gas at the aeration port 6 can be oxygen produced by the reaction of the front-end ozone catalytic oxidation device. The dissolved oxygen in the filter tank 3 is generally 2ppm.

[0019] The angle between the air inlet 9 and the water inlet 8 of the return pipe is less than 90°, and the air flow is ensured to drive the water flow smoothly.

[0020] When in use, the filter particles 5 are placed into the filter tank 3, and the sewage enters the filter tank 3 from the sewage inlet 4. After 1 hour of action, the aeration port 6 is opened to allow the filter particles 5 to float in the water, and the dissolved oxygen in the water is controlled to be 2ppm; then the water is discharged from the drain port 7, and at the same time, the filter particles 5 are pushed to move toward the drain port 7, and air is pumped in from the air inlet 9 to reduce the pressure in the return pipe 1, so that the filter particles 5 are sucked in from the return pipe water inlet 8, and then returned from the return pipe outlet 2 to the vicinity of the sewage inlet 4 of the filter tank 3 to ensure its uniform distribution.

[0021] The embodiments of this specific implementation method are all preferred embodiments of the utility model, and are not intended to limit the protection scope of the utility model. Therefore, all equivalent changes made based on the structure, shape, and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A novel biofilter device, characterized in that: It includes a filter tank and a return pipe, wherein a sewage inlet is provided on one side wall of the filter tank, a drain outlet and an air inlet are provided on the other side wall, an aeration port is provided on the bottom upper surface of the filter tank, the return pipe is arranged above the filter tank, and the side wall close to the water inlet end of the return pipe is connected with the air inlet, the return pipe outlet of the return pipe is arranged above the filter tank close to the sewage inlet, and filter material particles are provided inside the filter tank.

2. A novel biofilter device according to claim 1, characterized in that: The sewage inlet and the drain outlet are respectively arranged on a group of parallel side walls of the filter tank, and the distance between the sewage inlet and the bottom of the filter tank is greater than the distance between the drain outlet and the bottom of the filter tank.

3. A novel biofilter device according to claim 1, characterized in that: The number of the aeration ports must at least be sufficient to allow the bubbles to cover the bottom area of ​​the filter tank.

4. A novel biofilter device according to claim 1, characterized in that: The filter material particles are plastic particles or polyurethane sponge particles.

5. A novel biofilter device according to claim 1, characterized in that: The distance between the water inlet of the return pipe and the bottom of the filter tank is consistent with the distance between the filter material particles and the bottom of the filter tank.

6. A novel biofilter device according to claim 1, characterized in that: The angle between the air inlet and the water inlet of the return pipe is less than 90°.

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