Denitrification biofilter backwashing drainage weir structure capable of reducing filter material loss

Abstract

The utility model relates to a denitrification biofilter backwashing drainage weir structure capable of reducing filter material loss, which comprises an inclined drainage weir arranged between a denitrification biofilter and a filtering water outlet channel, a filter material is arranged in the denitrification biofilter, and the upper part of the inclined drainage weir is inclined towards one side of the filtering water outlet channel. A backwash drainage tank is arranged between the inclined drainage weir and the filtering water outlet channel, the upper end of the backwash drainage tank is lower than the upper end of the inclined drainage weir and the upper end of the filtering water outlet channel, a backwash drainage pipe is arranged below the backwash drainage tank in a communicating manner, and a valve is arranged on the backwash drainage pipe. According to the utility model, the drainage weir between the denitrification biofilter and the filtration water outlet channel is arranged to be the inclined drainage weir, so that the precipitation area of the filter material can be increased, the filter material can be more easily precipitated into the denitrification biofilter, the flow rate of backwashing water flow is slowed down, and the filter material brought out of the denitrification biofilter by high-speed backwashing water flow is reduced; and the filter material loss is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of sewage treatment, in particular to a denitrification biological filter backwashing drainage weir structure capable of reducing filter material loss. Background Art

[0002] In recent years, as the requirements for water environment quality have become increasingly higher, the emission standards of sewage treatment plants have become increasingly stringent. In order to remove total nitrogen from sewage, more and more sewage treatment plants have adopted denitrification biological filter technology.

[0003] During a filter's operating cycle, backwashing is essential for its proper operation. During backwashing, high-speed water flows upward through the filter layer, forcing the filter media upward due to flow resistance, resulting in a fluidized and expanded state. Typical filter backwash drains are rectangular, with straight-walled weirs and no filter media interception facilities. If the backwash flow intensity is improperly controlled, the expanded fine-particle filter media can easily be carried out of the filter by the high-speed backwash flow, resulting in loss of filter media. Summary of the Invention

[0004] The technical problem to be solved by the utility model is to provide a backwash drainage weir structure of a denitrification biological filter which can reduce the loss of filter material in view of the above-mentioned deficiencies in the prior art.

[0005] The utility model provides a technical solution to the above-mentioned technical problems as follows: a backwash drainage weir structure for a denitrifying biological filter capable of reducing filter material loss, comprising an inclined drainage weir arranged between the denitrifying biological filter and a filtration outlet channel, wherein filter material is arranged in the middle portion of the denitrifying biological filter along the backwash water flow direction, the upper portion of the inclined drainage weir is inclined toward one side of the filtration outlet channel, a backwash drainage trough is arranged between the inclined drainage weir and the filtration outlet channel, and the upper end height of the backwash drainage trough is lower than the upper end height of the inclined drainage weir and the upper end height of the filtration outlet channel, respectively, a backwash drainage pipe is arranged below the backwash drainage trough, and a valve for opening or closing the drainage channel is provided on the backwash drainage pipe.

[0006] The beneficial effects of the utility model are as follows: the backwash drainage weir structure of the denitrifying biological filter of the utility model can reduce the loss of filter media, and the drainage weir between the denitrifying biological filter and the filter outlet channel is set to an inclined drainage weir, which can increase the sedimentation area of ​​the filter media, making it easier for the filter media to settle back into the denitrifying biological filter, and at the same time slow down the flow rate of the backwash water flow, reducing the filter media carried out of the denitrifying biological filter by the high-speed backwash water flow, thereby reducing the loss of filter media.

[0007] On the basis of the above technical solution, the present invention can also be improved as follows:

[0008] Furthermore: the lower part of the inclined drainage weir is vertically arranged, and the angle between the upper part of the inclined drainage weir and the horizontal plane is 30-60°.

[0009] The beneficial effect of the above further scheme is: by vertically arranging the lower part of the inclined drainage weir, it can provide stable support for its upper part. At the same time, the inclined setting of the upper part of the inclined drainage weir can have a better blocking effect on the filter material, and controlling the inclination angle of its upper part can reduce the loss of filter material on the basis of ensuring the stability of the structural support.

[0010] Furthermore: the angle between the upper part of the inclined drainage weir and the horizontal plane is 45°.

[0011] Furthermore: a grid net for preliminary filtering of the filter material is vertically arranged on the upper part of the inclined drainage weir.

[0012] The beneficial effect of the above further solution is that by providing the grid mesh, the backwash water flow rate can be further slowed down, and the filter material carried out of the denitrification biological filter by the high-speed backwash water flow can be filtered and intercepted, thereby reducing the loss of filter material.

[0013] Furthermore: the height of the filter material is lower than the height of the lower end of the upper inclined section of the inclined drainage weir.

[0014] The beneficial effect of the above further solution is: by setting the height of the filter material to be lower than the height of the lower end of the upper inclined section of the inclined drainage weir, the impact of the backwash water flow on the filter material is reduced, and the probability of being carried out of the denitrification biological filter by the high-speed backwash water flow is reduced.

[0015] Further: A grille hanging basket is provided on one side of the upper port of the backwash drainage trough close to the upper part of the inclined drainage weir.

[0016] The beneficial effect of the above further solution is that the grid hanging basket can be provided to carry out the filter material carried out of the denitrification biological filter by the high-speed backwash water flow for secondary filtration, thereby preventing the filter material from entering the backwash drain pipe and further reducing the loss of the filter material.

[0017] Further: the grille hanging basket is detachably mounted to the upper port of the backwash drainage trough close to the upper side of the inclined drainage weir.

[0018] The beneficial effect of the above further solution is that by detachably mounting the grille hanging basket to the upper port of the backwash drainage trough close to the upper side of the inclined drainage weir, a grille hanging basket with a suitable mesh size can be selected for different filter material particle sizes.

[0019] Further: A waterproof sleeve is provided at the bottom of the backwash drainage trough and on the outer periphery of the backwash drainage pipe.

[0020] The beneficial effect of the above further solution is that the provision of the waterproof sleeve can play a water-stopping role, thereby preventing water seepage at the connection between the backwash drainage trough and the backwash drainage pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic cross-sectional view of a backwash drainage weir structure of a denitrifying biological filter capable of reducing filter material loss according to an embodiment of the present invention;

[0022] Figure 2 This is a schematic plan view of the backwash drainage weir structure of a denitrifying biological filter that can reduce filter material loss in one embodiment of the present invention.

[0023] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0024] 1. Denitrification biological filter, 2. Filtration outlet channel, 3. Inclined drainage weir, 4. Filter material, 5. Backwash drainage trough, 6. Backwash drainage pipe, 7. Valve, 8. Grille, 9. Grille hanging basket, 10. Waterproof casing. DETAILED DESCRIPTION

[0025] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0026] like Figure 1 and Figure 2 As shown, a backwash drainage weir structure of a denitrifying biological filter that can reduce filter material loss includes an inclined drainage weir 3 arranged between a denitrifying biological filter 1 and a filtration outlet channel 2. Filter material 4 is arranged in the middle of the denitrifying biological filter along the backwash water flow direction. The upper part of the inclined drainage weir 3 is inclined toward one side of the filtration outlet channel 2. A backwash drainage trough 5 is provided between the inclined drainage weir 3 and the filtration outlet channel 2, and the upper end height of the backwash drainage trough 5 is lower than the upper end height of the inclined drainage weir 3 and the upper end height of the filtration outlet channel 2, respectively. A backwash drainage pipe 6 is provided below the backwash drainage trough 5, and a valve 7 for opening or closing the drainage channel is provided on the backwash drainage pipe 6.

[0027] The utility model discloses a backwash drainage weir structure for a denitrifying biological filter that can reduce filter material loss. By setting the drainage weir between the denitrifying biological filter 1 and the filter outlet channel 2 as an inclined drainage weir 3, the sedimentation area of ​​the filter material 4 can be increased, making it easier for the filter material to settle back into the denitrifying biological filter 1. At the same time, the backwash water flow rate is slowed down, reducing the filter material 4 carried out of the denitrifying biological filter by the high-speed backwash water flow, thereby reducing the loss of the filter material 4.

[0028] In one or more embodiments of the present invention, the lower portion of the inclined drainage weir 3 is vertically positioned, and the angle between the upper portion of the inclined drainage weir 3 and the horizontal plane is 30-60 degrees. By vertically positioning the lower portion of the inclined drainage weir 3, it provides stable support for the upper portion. The inclined upper portion of the inclined drainage weir 3 also provides a better barrier effect on the filter material 4. Controlling the inclination angle of the upper portion can minimize the loss of the filter material 4 while ensuring structural stability.

[0029] Optionally, in one or more embodiments of the present invention, the angle between the upper portion of the inclined drainage weir 3 and the horizontal plane is 45°.

[0030] In one or more embodiments of the present invention, a screen mesh 8 is vertically disposed above the inclined drainage weir 3 for preliminary filtration of the filter material. The screen mesh 8 further slows the backwash flow rate and serves to filter and intercept filter material 4 carried out of the denitrification biofilter by the high-speed backwash flow, thereby reducing the loss of filter material 4.

[0031] It should be pointed out that, here, the grille net 8 is detachably arranged on the upper part of the inclined drainage weir 3, so that the grille net 8 with different mesh apertures can be replaced according to the filter materials 4 with different particle sizes to meet different filtration requirements, so that the collected filter materials 4 can be returned to the denitrification biological filter 1 for reuse.

[0032] In practice, the grid mesh 8 is vertically aligned with the lower portion of the inclined drainage weir 3 .

[0033] In one or more embodiments of the present invention, the height of the filter material 4 is lower than the height of the lower end of the upper inclined section of the inclined drainage weir 3. By setting the height of the filter material 4 lower than the height of the lower end of the upper inclined section of the inclined drainage weir 3, the probability of being carried out of the denitrification biological filter by the high-speed backwash water flow is reduced.

[0034] In one or more embodiments of the present invention, a screen basket 9 is provided at the upper end of the backwash drain trough 5, near the upper side of the inclined drainage weir 3. The screen basket 9 allows the filter material carried out of the denitrification biological filter by the high-speed backwash water flow to be filtered again, preventing the filter material 4 from entering the backwash drain pipe 5. The collected filter material 4 can then be returned to the denitrification biological filter 1 for reuse, further reducing the loss of the filter material 4.

[0035] Optionally, in one or more embodiments of the present invention, the grille basket 9 is detachably mounted to the upper end of the backwash trough 5 near the upper portion of the inclined drainage weir 3. By detachably mounting the grille basket 9 to the upper end of the backwash trough 5 near the upper portion of the inclined drainage weir 3, a grille basket 9 with an appropriate mesh size can be selected for different particle sizes of the filter media 4.

[0036] Optionally, in one or more embodiments of the present invention, a waterproof sleeve 10 is provided at the bottom of the backwash drain trough 5, located on the outer periphery of the backwash drain pipe 6. The provision of the waterproof sleeve 10 can serve as a water stop, thereby preventing water from seeping into the connection between the backwash drain trough 5 and the backwash drain pipe 6.

[0037] The utility model discloses a denitrifying biological filter backwash drainage weir structure capable of reducing filter material loss. During normal use, the valve 7 is closed, and sewage flows from the denitrifying biological filter 1 into the backwash drainage trough 5. Since the valve 7 is closed, the sewage cannot be discharged from the backwash drainage pipe 6 and can only remain in the backwash drainage trough 5. As the water level rises, the sewage overflows from the backwash drainage trough 5 into the filtration outlet channel 1 and is discharged from the filtration outlet channel 2. After a period of use, backwashing is required. At this time, the valve 7 is opened, and the backwash water flows from the denitrifying biological filter 1 into the backwash drainage trough 5. Since the valve 7 is open, the sewage can be discharged from the backwash drainage pipe 6 without entering the filtration outlet channel 2.

[0038] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, 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 biofilter backwash drainage weir structure capable of reducing filter media loss, characterized by: The invention comprises an inclined drainage weir (3) arranged between a denitrification biological filter (1) and a filtration outlet channel (2); a filter material (4) is arranged in the middle of the denitrification biological filter along the backwash water flow direction; the upper part of the inclined drainage weir (3) is arranged inclined toward one side of the filtration outlet channel (2); a backwash drainage trough (5) is arranged between the inclined drainage weir (3) and the filtration outlet channel (2); the upper end height of the backwash drainage trough (5) is lower than the upper end height of the inclined drainage weir (3) and the upper end height of the filtration outlet channel (2); a backwash drainage pipe (6) is arranged below the backwash drainage trough (5); and a valve (7) for opening or closing the drainage channel is provided on the backwash drainage pipe (6).

2. The backwash drainage weir structure of a denitrifying biological filter capable of reducing filter material loss according to claim 1, characterized in that: The lower part of the inclined drainage weir (3) is vertically arranged, and the angle between the upper part of the inclined drainage weir (3) and the horizontal plane is 30-60°.

3. The backwash drainage weir structure of a denitrifying biological filter capable of reducing filter material loss according to claim 2, characterized in that: The angle between the upper part of the inclined drainage weir (3) and the horizontal plane is 45°.

4. The backwash drainage weir structure of a denitrifying biological filter capable of reducing filter material loss according to claim 2, characterized in that: A grid net (8) for preliminarily filtering the filter material is vertically arranged on the upper part of the inclined drainage weir (3).

5. The backwash drainage weir structure of a denitrifying biological filter capable of reducing filter material loss according to claim 2, characterized in that: The height of the filter material (4) is lower than the height of the lower end of the upper inclined section of the inclined drainage weir (3).

6. The backwash drainage weir structure of a denitrifying biological filter capable of reducing filter material loss according to claim 1, characterized in that: A grille hanging basket (9) is provided on one side of the upper port of the backwash drainage trough (5) close to the upper part of the inclined drainage weir (3).

7. The backwash drainage weir structure of a denitrifying biological filter capable of reducing filter material loss according to claim 6, characterized in that: The grille hanging basket (9) is detachably mounted to the upper end of the backwash drainage trough (5) close to the upper side of the inclined drainage weir (3).

8. The backwash drainage weir structure for a denitrifying biological filter capable of reducing filter material loss according to any one of claims 1 to 7, characterized in that: The bottom of the backwash drainage trough (5) is located on the outer periphery of the backwash drainage pipe (6) and is provided with a waterproof sleeve (10).

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