Denitrification deep-bed filter tank capable of reducing construction depth of filter tank

Abstract

The utility model discloses a denitrification deep bed filter tank capable of reducing filter tank construction depth, which comprises a support plate body, filter bricks and bolts, the support plate body is a porous material body formed by casting non-toxic and corrosion-resistant high density polyethylene (HDPE) particles, the surface of the support plate body is provided with a plurality of through holes, and the filter bricks are arranged on the support plate body. The supporting plate body is arranged on the top surface of the filter brick, a plurality of bolt holes are formed in the top surface of the filter brick and the surface of the supporting plate body, and the bolts are arranged in the bolt holes in the surfaces of the filter brick and the supporting plate body and used for fixing the supporting plate body and the filter brick. The supporting plate body formed by casting the HDPE material is adopted, the problem of raw material shortage does not exist, meanwhile, the supporting plate body formed by casting the HDPE material replaces a cobblestone bearing layer, and the supporting plate is small in transportation size, light in weight and low in transportation cost.

Description

Technical Field

[0001] The utility model relates to the technical field of sewage treatment, in particular to a denitrification deep bed filter capable of reducing the structural depth of the filter. Background Art

[0002] In order to improve the discharge of total nitrogen in sewage, many sewage treatment plants are now being built and upgraded. Therefore, many sewage treatment plants have carried out upgrading and transformation of secondary effluent and requirements for deep treatment of tail water. Denitrification deep bed filter has the ability to remove SS, TN and TP at the same time. Therefore, it is used in upgrading and transformation of more and more sewage treatment plants. The main structure of the denitrification deep bed filter is composed of filter material layer, supporting layer, water and air distribution system, effluent system and backwash drainage system.

[0003] Among them, the supporting layer is an important unit of the filter structure, generally made of natural pebbles, with a height of about 0.45m and a particle size range of 3 to 38mm. It is arranged in a "sandwich" shape, with a total of 5 layers, with large stone diameters at both ends and small stone diameters in the middle layer (from bottom to top: the first layer is 38×19mm, the second layer is 19×13mm, the third layer is 13×6mm, the fourth layer is 6×3mm, and the fifth layer is 13×6mm). Research has found that the denitrification deep bed filter in the existing technology (especially its supporting layer) still has some defects:

[0004] 1. Shortage of supporting layer pebbles: Domestic urban sewage treatment facilities are generally facing the need for upgrading and renovation. The denitrification deep bed filter process is a widely used technology in the industry, which indirectly leads to a huge demand for supporting layer pebbles in its internal structure. Pebbles are a purely natural stone material, and the large-scale mining of natural sand has caused serious damage to the natural environment. (Pebbles are a by-product of yellow sand mining, named for their resemblance to goose eggs. The mining of natural sand is prohibited in China, so the raw materials of sand and gravel are currently in short supply.)

[0005] 2. The transportation cost of supporting pebbles is high: pebbles are natural stones with a large unit volume weight, and the transportation cost is high;

[0006] 3. Complex construction and filling: As mentioned above, the pebbles required for the supporting layer of the denitrification deep bed filter need to be filled in five levels, and the particle size of each level is different, which makes the construction process more complicated;

[0007] 4. Risk of misalignment between filter media and supporting layer: During backwashing, a large amount of water carrying backwash air through the supporting layer may cause the supporting layer to loosen. This loosening of the supporting layer will not only cause the pebbles to misalign with each other, but also cause the filter media to move downward, resulting in misalignment between the filter media and the supporting layer. Ultimately, the filter media will leak into the water and air distribution system and be lost with the outlet water.

[0008] 5. Complex maintenance work: When regularly replacing the water and air distribution system at the bottom of the supporting layer, the pebbles must be cleared out before subsequent work, which will consume a lot of manpower and material resources;

[0009] 6. The filter tank is constructed at a relatively high height: Since the design height of the supporting layer is 0.45m, an additional 0.45m civil structure needs to be added in the depth direction of the filter tank. Utility Model Content

[0010] The purpose of the utility model is to provide a denitrification deep bed filter capable of reducing the structural depth of the filter, so as to solve the problems raised by the above-mentioned background technology.

[0011] To achieve the above-mentioned object, the present invention provides the following technical solution: a denitrification deep bed filter capable of reducing the depth of the filter structure, comprising a support plate body, filter bricks, and bolts, wherein the support plate body is a porous material body formed by melting and casting non-toxic and corrosion-resistant high-density polyethylene (HDPE) particles, and a plurality of through holes are formed on the surface of the support plate body;

[0012] The support plate body is arranged on the top surface of the filter brick. A plurality of bolt holes are provided on the top surface of the filter brick and the surface of the support plate body. The bolts are arranged in the bolt holes on the surface of the filter brick and the support plate body to fix the support plate body and the filter brick.

[0013] Preferably, the multiple through holes on the support plate body are evenly spaced apart.

[0014] Preferably, the bolt holes of the support plate body and the filter brick correspond in vertical position.

[0015] Preferably, there are multiple bolts, and the multiple bolts are evenly spaced and arranged in the bolt holes on the top surface of the support plate body.

[0016] Preferably, the gap between adjacent through holes on the support plate body is between 300-500 μm.

[0017] Preferably, the support plate body has a height of 25 mm.

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] 1. This denitrification deep bed filter, which can reduce the structural depth of the filter, uses a porous filter material support plate instead of a supporting layer. The porous filter material support plate is a porous material made by melting and casting non-toxic and corrosion-resistant high-density polyethylene (HDPE) particles. Since it is made by melting and casting HDPE material, there is no problem of raw material shortage. At the same time, the support plate body formed by melting and casting HDPE material replaces the supporting layer of pebbles, and its transportation volume is small, weight is light, and transportation costs are low.

[0020] 2. The denitrification deep bed filter can reduce the structural depth of the filter. The water and air distribution system is placed in the filter bricks, and the support plate replaces the supporting layer of pebbles. The construction of the improved denitrification deep bed filter is more convenient. It only needs to be fixed to the bolt holes reserved on the top of the filter bricks of the water and air distribution system with bolts. The support plate is fastened to the filter bricks of the water and air distribution system without the risk of displacement. At the same time, the maintenance work is convenient. When replacing the water and air distribution system, it is only necessary to loosen the support plate bolts. In addition, the construction depth of the filter can be reduced, reducing civil engineering investment. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the overall structure of the utility model;

[0022] Figure 2 This is a schematic diagram of the cross-sectional structure of the utility model;

[0023] Figure 3 This is a schematic diagram of the structure of the support plate of the utility model when viewed from above;

[0024] Figure 4 This is a schematic diagram comparing the structures of the present utility model and the traditional solution.

[0025] In the figure: 1. Support plate body; 2. Filter brick; 3. Bolt; 4. Through hole. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0027] Example 1

[0028] Please refer to Figure 1-4 As shown, the utility model provides a denitrification deep bed filter capable of reducing the depth of the filter structure, comprising a support plate body 1, filter bricks 2 and bolts 3. The support plate body 1 is a porous material body formed by melting and casting non-toxic and corrosion-resistant high-density polyethylene HDPE particles. A plurality of through holes 4 are opened on the surface of the support plate body 1.

[0029] The support plate body 1 is arranged on the top surface of the filter brick 2. Multiple bolt holes are provided on the top surface of the filter brick 2 and the surface of the support plate body 1. Bolts 3 are arranged in the bolt holes on the surface of the filter brick 2 and the support plate body 1 for fixing the support plate body 1 and the filter brick 2.

[0030] Specifically, the support plate body 1 formed by melting and casting HDPE material does not have the problem of raw material shortage. At the same time, the support plate body 1 formed by melting and casting HDPE material replaces the supporting layer of pebbles, which has a small transportation volume, light weight, and low transportation cost.

[0031] Among them: multiple through holes 4 on the support plate body 1 are evenly spaced, the bolt holes of the support plate body 1 and the filter brick 2 correspond in the vertical direction, there are multiple bolts 3, and the multiple bolts 3 are evenly spaced in the bolt holes on the top surface of the support plate body 1. By placing the support plate body 1 on the top surface of the filter brick 2 and making the bolt holes on the surfaces of the support plate body 1 and the filter brick 2 correspond one to one, and then screwing the bolts 3 into the bolt holes, the connection and fixation work between the support plate body 1 and the filter brick 2 is completed.

[0032] The gap between adjacent through holes 4 on the support plate body 1 is between 300-500 μm, and the height of the support plate body 1 is 25 mm.

[0033] Working principle: The utility model is a denitrification deep bed filter which can reduce the structural depth of the filter. A porous filter material support plate is used instead of the supporting layer. The support plate is made of HDPE material and is cast. There is no problem of raw material shortage. At the same time, its transportation volume is small, the weight is light, and the transportation cost is low. The water distribution and air distribution system is placed in the filter brick 2. The construction of the improved denitrification deep bed filter is more convenient. It only needs to be fixed with bolts 3 at the bolt holes reserved on the top of the filter brick 2 of the water distribution and air distribution system. The support plate is fastened to the filter brick 2 of the water distribution and air distribution system without the risk of displacement. At the same time, the maintenance work is convenient. When replacing the water distribution and air distribution system, it is only necessary to loosen the support plate bolts 3. In addition, the construction depth of the filter can be reduced, and the civil engineering investment can be reduced.

[0034] The contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0035] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. 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 denitrification deep bed filter capable of reducing the depth of the filter structure, comprising a support plate body (1), filter bricks (2) and bolts (3), characterized in that: The support plate body (1) is a body made of a porous material melt-cast from non-toxic and corrosion-resistant high-density polyethylene (HDPE) particles, and a plurality of through holes (4) are formed on the surface of the support plate body (1); The support plate body (1) is arranged on the top surface of the filter brick (2); the top surface of the filter brick (2) and the surface of the support plate body (1) are both provided with a plurality of bolt holes; the bolts (3) are arranged in the bolt holes on the surfaces of the filter brick (2) and the support plate body (1) and are used to fix the support plate body (1) and the filter brick (2).

2. The denitrification deep bed filter capable of reducing the filter structure depth according to claim 1, characterized in that: The multiple through holes (4) on the support plate body (1) are evenly spaced and distributed.

3. The denitrification deep bed filter capable of reducing the filter structure depth according to claim 1, characterized in that: The bolt holes of the support plate body (1) and the filter brick (2) correspond in vertical position.

4. A denitrification deep bed filter capable of reducing the depth of the filter structure according to claim 3, characterized in that: There are a plurality of bolts (3), and the plurality of bolts (3) are evenly spaced and arranged in the bolt holes on the top surface of the support plate body (1).

5. The denitrification deep bed filter capable of reducing the filter structure depth according to claim 1, characterized in that: The pore size between adjacent through holes (4) on the support plate body (1) is between 300-500 μm.

6. The denitrification deep bed filter capable of reducing the filter structure depth according to claim 1, characterized in that: The support plate body (1) has a height of 25 mm.

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