Filter material backwashing device for deep-bed denitrification filter tank

Abstract

The utility model relates to a filter material backwashing device for a deep-bed denitrification filter tank, which belongs to the technical field of denitrification filter tanks and comprises a filter tank body, a gravel layer is arranged on the lower portion of the filter tank body, a water collecting pipe communicated with the gravel layer is arranged in the gravel layer, a filter material layer is arranged at the upper end of the gravel layer, and the filter material layer is communicated with the gravel layer. A supporting layer is arranged between the filter material layer and the sandstone layer, a filter material backwashing assembly extending to the filter material layer is arranged between the supporting layer and the sandstone layer, and an overflow pipe extending out of the filter material layer to the upper part of the filter tank body is arranged at the upper end of the filter material backwashing assembly. The backwashing device has the characteristics of compact structure, good operation stability and uniform backwashing. The problem that the filter material layer is uniformly and effectively cleaned is solved. The operation efficiency is improved; and the operation cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of denitrification filter tanks, in particular to a filter material backwashing device for a deep bed denitrification filter tank. Background Art

[0002] In recent years, with the increasing attention paid to the ecological environment in China, the quality of sewage treatment in sewage treatment plants has been continuously improved, and one of the important indicators is total nitrogen. The engineering measures commonly used to remove total nitrogen generally include conventional anoxic denitrification tanks and deep treatment denitrification filters. The basic principle of denitrification in denitrification filters is to use the oxidative decomposition of the biofilm attached to the filter material in the reactor, the adsorption and interception of the filter material and biofilm, the hierarchical predation of the food chain formed along the water flow direction, and the internal microenvironment of the biofilm and the anoxic denitrification to achieve the purpose of denitrification.

[0003] The traditional filter plate or filter head water and air distribution system and the filter brick system that relies on fluid reflection for water and air distribution have a backwashing blind area above the water and air distribution system, which means that the backwashing air and water cannot effectively backwash the filter media. In long-term operation, a large amount of sludge will accumulate in the supporting layer or filter media, increasing the head loss, shortening the filtration cycle, and posing the risk of supporting layer disturbance. After years of filtration, the filter media must be cleaned. If it is not cleaned properly, this part of the filter media will lose the function of intercepting impurities in the water, and the effluent water quality will deteriorate and fail to meet the standards. Summary of the invention

[0004] The utility model mainly solves the problem of uneven backwashing in the prior art, which causes poor cleaning and the filter material layer cannot be cleaned evenly and effectively, and provides a filter material backwashing device for a deep bed denitrification filter tank, which has the characteristics of compact structure, good operation stability and uniform backwashing. It solves the problem of uniform and effective cleaning of the filter material layer, improves operation efficiency and reduces operation costs.

[0005] The above technical problems of the utility model are mainly solved by the following technical solutions:

[0006] A filter media backwashing device for a deep bed denitrification filter comprises a filter tank housing, a sand and gravel layer is arranged at the lower part of the filter tank housing, a water collecting pipe connected to the sand and gravel layer is arranged in the sand and gravel layer, a filter media layer is arranged at the upper end of the sand and gravel layer, a supporting layer is arranged between the filter media layer and the sand and gravel layer, a filter media backwashing assembly extending to the filter media layer is arranged between the supporting layer and the sand and gravel layer, and an overflow pipe extending from the filter media layer to the upper part of the filter tank housing is arranged at the upper end of the filter media backwashing assembly.

[0007] The filter layer provides the area required for the adhesion of suspended solids in the water. In addition to the natural sand that has been used for a long time, natural materials such as quartz, anthracite, marble, travertine, granite, garnet, magnetite, ilmenite, etc., which are processed into particles that meet the specifications, can also be used as filter media. Inorganic materials can also be made into filter media after sintering and crushing, such as ceramsite filter media and ceramic filter media.

[0008] The supporting layer is also called graded gravel layer. Its main function is to prevent the filter media from being lost from the water collection system during the filtration process. The supporting layer is laid with graded gravel. This gradation can ensure a certain uniform water distribution during backwashing, thereby maintaining the normal operation of the filter tank.

[0009] Preferably, the filter media backwashing assembly comprises a backwashing main pipe, a plurality of backwashing branches connected to the supporting layer are arranged on one side of the backwashing main pipe, a plurality of rows of backwashing holes are arranged at equal intervals on the backwashing branches, and a backwashing riser is arranged between the backwashing main pipe and the overflow pipe. The backwashing holes are distributed downward to increase the bubbles in the water during backwashing, so that the supporting layer and the filter media layer above the filter brick layer are cleaned more thoroughly.

[0010] Preferably, a filter brick layer is provided between the backwash branch pipe and the supporting layer, and a fixed bracket block is provided at the front of the backwash branch pipe, which is fixedly connected to the filter brick layer by screws and is clamped and crimped with the backwash branch pipe.

[0011] Preferably, a plurality of main pipe fixing plates which are bolted and fixed to the inner wall of the filter tank box are provided on the other side of the backwash main pipe.

[0012] Preferably, a connecting flange is provided between the backwash riser and the overflow pipe.

[0013] Preferably, sewage conveying channels connected to the filter tank body are provided on both sides of the upper part of the filter tank body.

[0014] The utility model can achieve the following effects:

[0015] The utility model provides a filter material backwashing device for a deep bed denitrification filter tank, which has the characteristics of compact structure, good operation stability and uniform backwashing compared with the prior art, solves the problem of uniform and effective cleaning of the filter material layer, improves operation efficiency and reduces operation cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the utility model.

[0017] Figure 2 It is a structural schematic diagram of the backwash component in the utility model.

[0018] Figure 3 It is a structural schematic diagram of the backwash branch pipe in the utility model.

[0019] In the figure: sewage conveying canal 1, filter tank box 2, overflow pipe 3, filter material layer 4, connecting flange 5, filter material backwashing assembly 6, supporting layer 7, filter brick layer 8, water collecting pipe 9, sand and gravel layer 10, backwashing branch pipe 11, backwashing main pipe 12, main pipe fixing plate 13, backwashing riser 14, fixed bracket block 15, backwashing small hole 16. DETAILED DESCRIPTION

[0020] The technical solution of the utility model is further specifically described below through embodiments and in conjunction with the accompanying drawings.

[0021] Example: Figure 1 , Figure 2 and Figure 3 As shown, a filter material backwashing device for a deep bed denitrification filter includes a filter tank housing 2, and sewage conveying canals 1 connected to the filter tank housing 2 are provided on both sides of the upper part of the filter tank housing 2. A sand and gravel layer 10 is provided at the lower part of the filter tank housing 2, and a water collecting pipe 9 connected to the sand and gravel layer 10 is provided in the sand and gravel layer 10. A filter material layer 4 is provided at the upper end of the sand and gravel layer 10, and a supporting layer 7 is provided between the filter material layer 4 and the sand and gravel layer 10. A filter material backwashing assembly 6 extending to the filter material layer 4 is provided between the supporting layer 7 and the sand and gravel layer 10, and an overflow pipe 3 extending from the filter material layer 4 to the upper part of the filter tank housing 2 is provided at the upper end of the filter material backwashing assembly 6.

[0022] The filter material backwashing assembly 6 includes a backwashing main pipe 12, and 30 backwashing branches 11 connected to the supporting layer 7 are arranged on one side of the backwashing main pipe 12, and 10 main pipe fixing plates 13 are bolted and fixed to the inner wall of the filter tank box 2 on the other side of the backwashing main pipe 12. Two rows of backwashing holes 16 are arranged at equal intervals on the backwashing branch pipe 11, and a backwashing riser 14 is arranged between the backwashing main pipe 12 and the overflow pipe 3, and a connecting flange 5 is arranged between the backwashing riser 14 and the overflow pipe 3. A filter brick layer 8 is arranged between the backwashing branch pipe 11 and the supporting layer 7, and a fixed bracket block 15 is arranged at the front of the backwashing branch pipe 11, which is screwed and fixed to the filter brick layer 8 and is clamped and pressed with the backwashing branch pipe 11.

[0023] When the filter layer 4 needs to be flushed, water is injected through the overflow pipe 3, enters the backwash branch pipe 11 through the backwash riser 14 and the backwash main pipe 12, and backwashes the filter layer 4 from the backwash holes 16 on the backwash branch pipe 11, so that the filter layer 4 and the supporting layer 7 are cleaned evenly and effectively, preventing the filter layer 4 and the supporting layer 7 from being blocked and affecting the water filtration efficiency.

[0024] When the filter layer 4 is clogged, the sewage on the upper layer of the filter layer 4 gathers and flows into the overflow pipe 3, enters the backwash branch pipe 11 through the backwash riser 14 and the backwash main pipe 12, and backwashes the filter layer 4 from the backwash holes 16 on the backwash branch pipe 11, so that the filter layer 4 and the supporting layer 7 are evenly and effectively cleaned, thereby solving the problem of blockage of the filter layer 4 and the supporting layer 7.

[0025] In summary, the filter media backwashing device for deep bed denitrification filter has the characteristics of compact structure, good operation stability and uniform backwashing. It solves the problem of uniform and effective cleaning of the filter media layer, improves operation efficiency and reduces operation cost.

[0026] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention. Any reference numerals in the claims should not be regarded as limiting the claims involved.

[0027] In summary, the above description is only a specific embodiment of the present invention, but the structural features of the present invention are not limited thereto. Any changes or modifications made by any technician in the field of the present invention are included in the patent scope of the present invention.

Claims

1. A filter material backwashing device for a deep bed denitrification filter, characterized in that: The invention comprises a filter tank housing (2), wherein a gravel layer (10) is provided at the lower part of the filter tank housing (2), a water collecting pipe (9) connected to the gravel layer (10) is provided in the gravel layer (10), a filter material layer (4) is provided at the upper end of the gravel layer (10), a supporting layer (7) is provided between the filter material layer (4) and the gravel layer (10), a filter material backwashing assembly (6) extending to the filter material layer (4) is provided between the supporting layer (7) and the gravel layer (10), and an overflow pipe (3) extending from the filter material layer (4) to the upper part of the filter tank housing (2) is provided at the upper end of the filter material backwashing assembly (6).

2. The filter material backwashing device for a deep bed denitrification filter according to claim 1, characterized in that: The filter material backwashing assembly (6) comprises a backwashing main pipe (12), one side of which is provided with a plurality of backwashing branch pipes (11) connected to the supporting layer (7), the backwashing branch pipes (11) being provided with a plurality of rows of backwashing small holes (16) distributed at equal intervals, and a backwashing riser (14) being provided between the backwashing main pipe (12) and the overflow pipe (3).

3. A filter material backwashing device for a deep bed denitrification filter according to claim 2, characterized in that: A filter brick layer (8) is provided between the backwash branch pipe (11) and the supporting layer (7), and a fixed bracket block (15) is provided at the front of the backwash branch pipe (11) and is fixedly connected to the filter brick layer (8) by screws and is clamped and crimped with the backwash branch pipe (11).

4. The filter material backwashing device for a deep bed denitrification filter according to claim 2, characterized in that: The other side of the backwash main pipe (12) is provided with a plurality of main pipe fixing plates (13) which are bolted and fixed to the inner wall of the filter tank housing (2).

5. The filter material backwashing device for a deep bed denitrification filter according to claim 2, characterized in that: A connecting flange (5) is provided between the backwash riser (14) and the overflow pipe (3).

6. The filter material backwashing device for a deep bed denitrification filter according to claim 1, characterized in that: Both sides of the upper part of the filter tank body (2) are provided with sewage conveying channels (1) connected to the filter tank body (2).

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