Sludge screening device and system

Abstract

The present invention relates to the field of water treatment technology, and specifically to a sludge screening device and system. The sludge screening device includes a main body, a filler, and a sludge collecting weir. The interior of the main body is a cavity, and a partition is provided in the cavity. One side of the partition is a screening area, and the other side is a concentration area. The bottom of the main body is open, and multiple layers of filler are provided in the screening area. The filler is provided with multiple layers of grids, and the grids between adjacent layers are staggered. The sludge collecting weir is provided in the screening area, located above the filler, and the sludge collecting weir is connected to the concentration area. Water containing activated sludge flows upward from the bottom of the main body. When the water passes through the filler, due to the staggered arrangement of the grids between adjacent layers on the filler, the water passing through can be guided to form a vortex, intercepting heavy sludge with relatively heavy specific gravity in the water below the filter, and screening out light sludge from the water, thereby improving the sedimentation ratio of the activated sludge, increasing the content of heavy sludge in the water, extending the sludge age, and further improving the effect of water treatment.

Description

Technical Field

[0001] The present invention relates to the technical field of water treatment, and in particular to a sludge screening device and system. Background Art

[0002] The activated sludge process is a biological wastewater treatment technology, primarily based on activated sludge. This process involves mixing wastewater with activated sludge, stirring it, and aerating it to decompose organic pollutants in the wastewater. Biosolids are then separated from the treated wastewater, with some being returned to the aeration tank as needed. The activated sludge is inhabited by a microbial community, primarily flocculents, which possess a strong ability to adsorb and oxidize organic matter. The activated sludge utilizes its biocoagulation, adsorption, and oxidation processes to decompose and remove organic pollutants from wastewater.

[0003] In the prior art, activated sludge used in water treatment is mixed with light sludge, which has weak adsorption and oxidizing properties, resulting in poor water treatment effect. Summary of the Invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defect in the prior art that the sludge used in water treatment is mixed with light sludge, thereby resulting in poor water treatment effect.

[0005] In order to solve the above technical problems, the present invention provides a sludge screening device, comprising:

[0006] The main body has a cavity inside, a partition is provided in the cavity, one side of the partition is a screening area, and the other side is a concentration area, and the bottom of the main body is an opening;

[0007] Filler, wherein multiple layers of the filler are arranged in the screening area, and multiple layers of grids are provided on the filler, and the grids between adjacent layers are staggered;

[0008] A mud collecting weir is arranged in the screening area and above the filler, and the mud collecting weir is communicated with the concentration area.

[0009] Furthermore, in this sludge screening device, the grid is a polygon.

[0010] Furthermore, in this sludge screening device, the grid ends are aligned with the center positions of the grids of the adjacent layers.

[0011] Furthermore, in this sludge screening device, the grid is hexagonal, two short sides of the hexagon are parallel and equal in length, and the remaining four sides are parallel in pairs and equal in length.

[0012] Furthermore, in this sludge screening device, a concentration hopper is provided in the concentration zone, which is suitable for concentrating the sludge.

[0013] Furthermore, the sludge screening device further comprises:

[0014] Water outlet pipes are respectively provided at the upper ends of the screening area and the concentration area, and the water outlet pipes are located above the mud collecting weir.

[0015] Furthermore, in this sludge screening device, a sludge discharge pipe is provided at the bottom of the concentration bucket.

[0016] Furthermore, in this sludge screening device, the filler is a polymer material.

[0017] The present invention also provides a sludge screening system, comprising the above-mentioned sludge screening device.

[0018] Furthermore, the sludge screening system further comprises:

[0019] The biochemical pool is provided with the sludge screening device, and the bottom of the main body is connected with the biochemical pool.

[0020] The technical solution of the present invention has the following advantages:

[0021] 1. The sludge screening device provided by the present invention includes a main body, filler and a sludge collecting weir. The interior of the main body is a cavity, and a partition is provided in the cavity. One side of the partition is a screening area, and the other side is a concentration area. The bottom of the main body is an opening, and multiple layers of filler are arranged in the screening area. Multiple layers of grids are provided on the filler, and the grids between adjacent layers are staggered. The sludge collecting weir is arranged in the screening area, located above the filler, and the sludge collecting weir is connected to the concentration area.

[0022] The water containing activated sludge flows upward from the bottom of the main body. When the water passes through the filler, the grids between adjacent layers on the filler are staggered, which can guide the water to form a vortex, intercepting the heavy sludge with relatively heavy specific gravity in the water under the filter, while the light sludge with relatively light specific gravity rises with the water flow. Under the action of gravity, the light sludge falls into the sludge collecting weir and flows into the concentration area, so that the light sludge can be screened out from the water, improving the sedimentation ratio of the activated sludge, increasing the content of heavy sludge in the water, extending the sludge age, and further improving the water treatment effect.

[0023] 2. The sludge screening device provided by the present invention has grid ends aligned with the center positions of the grids of the adjacent layers, so that the grids between adjacent layers are evenly staggered. When water flows upward from the bottom grid, the staggered grids divide the upward water flow into multiple streams. The multi-layer grids disturb the flowing water, guiding the passing water to rise and form a vortex, so that the heavy sludge can settle naturally, and the light sludge rises with the water flow to the sludge weir and flows into the concentration area, thereby improving the sedimentation ratio of the activated sludge, increasing the content of heavy sludge in the water, extending the sludge age, and further improving the water treatment effect. It has the advantages of simple structure and obvious treatment effect.

[0024] 3. The mud screening device provided by the present invention is provided with a concentration bucket in the concentration area. The light sludge collected by the mud collecting weir flows into the concentration bucket in the concentration area and is concentrated, which facilitates the reuse of the concentrated sludge and improves the utilization rate of the sludge.

[0025] 4. The sludge screening device provided by the present invention is provided with an outlet pipe at the upper end of the screening area and the concentration area respectively. The outlet pipe is located above the sludge collecting weir. As the light sludge falls into the sludge collecting weir and the concentration hopper under the action of gravity, the lighter water flow rises to the outlet pipe and is discharged.

[0026] 5. The sludge screening system provided by the present invention includes a sludge screening device and a biochemical pool. The sludge screening device is arranged in the biochemical pool and is connected to the biochemical pool.

[0027] The water containing activated sludge in the biochemical pool enters the screening area of ​​the sludge screening device from the bottom. The heavy sludge with relatively heavy specific gravity in the water is screened out by the sludge screening device and then returned to the biochemical pool for water treatment again, thereby increasing the content of heavy sludge in the water. The light sludge with relatively light specific gravity is screened into the concentration area for concentration, thereby extending the sludge age and further improving the water treatment effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0029] Figure 1 This is a front view of a mud screening device provided in an embodiment of the present invention;

[0030] Figure 2 A top view of the filler in the sludge screening device provided in Example 1 of the present invention;

[0031] Figure 3 A top view of a single layer of grids in the sludge screening device provided in Example 1 of the present invention;

[0032] Figure 4 A top view of the filler in the sludge screening device provided in Example 2 of the present invention;

[0033] Figure 5 A top view of a single grid layer in the sludge screening device provided in Example 2 of the present invention;

[0034] Figure 6A top view of the filler in the sludge screening device provided in Example 3 of the present invention;

[0035] Figure 7 A top view of a single layer of grids in the sludge screening device provided in Example 3 of the present invention;

[0036] Figure 8 This is a front view of the mud screening system provided in an embodiment of the present invention.

[0037] Explanation of the accompanying symbols: 1. Main body; 11. Partition; 12. Screening area; 13. Concentration area; 2. Filler; 21. Grid; 3. Mud collection weir; 31. Mud collection pipe; 4. Concentration hopper; 41. Mud discharge pipe; 5. Outlet pipe; 6. Biochemical pool. DETAILED DESCRIPTION

[0038] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0039] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0040] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0041] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0042] Example 1

[0043] like Figure 1As shown, a sludge screening device provided by the present invention includes a main body 1, a filler 2 and a mud collecting weir 3. The interior of the main body 1 is a cavity, and a partition 11 is provided in the cavity. One side of the partition 11 is a screening area 12, and the other side is a concentration area 13. The bottom of the main body 1 is open, and multiple layers of filler 2 are arranged in the screening area 12. Multiple layers of grids 21 are provided on the filler 2, and the grids 21 between adjacent layers are staggered. Multiple mud collecting weirs 3 are arranged in the screening area 12, located above the filler 2, and a mud collecting pipe 31 is connected to the bottom of the mud collecting weir 3, and the mud collecting pipe 31 is connected to the concentration area 13.

[0044] The present embodiment does not impose any specific limitation on the filler 2 . To conform to the actual situation, the meshes 21 on the filler 2 in the present embodiment have four layers.

[0045] The filler 2 is made of a polymer material. Specifically, in this embodiment, the filler 2 is made of modified PVC (Polyvinyl Chloride).

[0046] The water body containing activated sludge flows upward from the bottom of the main body 1. When the water body passes through the filler 2, the grids 21 between adjacent layers on the filler 2 are staggered, which can guide the water body passing through to form a vortex, and intercept the heavy sludge with relatively large specific gravity and relatively dense in the water body under the filler 2, while the loose light sludge such as flocculent sludge, free bacteria, filamentous bacteria, etc. with relatively light specific gravity flows upward with the water flow, falls into the sludge collecting weir 3 under the action of gravity, and then flows into the concentration area 13, so that the light sludge can be screened out from the water body, and the content of heavy sludge in the water body is increased. The intercepted heavy sludge optimizes the microbial population, improves the sludge settling ratio, increases the microbial concentration in the water body, and prolongs the sludge age, thereby improving the effect of biological denitrification and phosphorus removal in water treatment.

[0047] like Figure 2 and Figure 3 As shown, the grid 21 of the filler 2 is polygonal, and the ends of the grid 21 are aligned with the center positions of the grids 21 of the adjacent layers, so that the grids 21 between adjacent layers are evenly staggered. When the water flows upward from the bottom grid 21, the staggered grids 21 divide the upward water flow into multiple streams. The multi-layer grids 21 disturb the flowing water and guide the passing water to form a vortex, so that the heavy sludge can settle naturally, and the light sludge rises with the water flow to the sludge collecting weir 3 and flows into the concentration area 13, thereby improving the sedimentation ratio of the activated sludge, increasing the content of heavy sludge in the water, extending the sludge age, and further improving the water treatment effect. It has the advantages of simple structure and obvious treatment effect.

[0048] like Figure 3 As shown, in this embodiment, the grid 21 is hexagonal, two short sides of the hexagon are parallel and equal in length, and the remaining four sides are parallel in pairs and equal in length.

[0049] like Figure 1 As shown, a concentration bucket 4 is provided in the concentration area 13, and a mud discharge pipe 41 is provided at the bottom of the concentration bucket 4. The light sludge collected by the mud collecting weir 3 flows into the concentration bucket 4 in the concentration area 13 and is concentrated. The concentrated sludge is discharged through the mud discharge pipe 41 and can be reused, thereby improving the utilization rate of the sludge.

[0050] like Figure 1 As described above, outlet pipes 5 are respectively provided at the upper ends of the screening area 12 and the concentration area 13. The outlet pipes 5 are located above the sludge collecting weir 3. As the light sludge falls into the sludge collecting weir 3 and the concentration hopper 4 under the action of gravity, the lighter water flows upward and is discharged into the outlet pipes 5. By setting the outlet pipes 5 at different heights, the height of the liquid level in the main body 1 can be controlled, and the rising water flow can be further controlled.

[0051] Example 2

[0052] like Figure 4 and Figure 5 As shown, the difference between this embodiment and the above embodiment is that the grids 21 in this embodiment are equilateral triangles, and the grids 21 triangles in adjacent layers are arranged in opposite directions.

[0053] Example 3

[0054] like Figure 6 and Figure 7 As shown, the difference between this embodiment and the above embodiment is that the grids 21 in this embodiment are square, and the vertices of the grids 21 of one layer coincide with the centers of the grids 21 of the adjacent layer.

[0055] Example 4

[0056] like Figure 8 As shown, the present invention provides a sludge screening system, which adopts the sludge screening device in the above embodiment, and also includes a biochemical pool 6, in which sewage containing activated sludge is contained. The sludge screening device is arranged in the biochemical pool 6, and the bottom of the screening area of ​​the main body 1 is connected to the biochemical pool 6.

[0057] The water containing activated sludge in the biochemical pool 6 is transported from the bottom of the screening area of ​​the main body 1 to the sludge screening device. The heavy sludge with relatively large specific gravity and relatively dense in the water body is intercepted at the bottom of the main body 1 by the sludge screening device, while the loose light sludge such as flocculent sludge, free bacteria, filamentous bacteria, etc. with relatively light specific gravity flows upward with the water flow, falls into the sludge collecting weir 3 under the action of gravity, and then flows into the concentration area 13, so that the light sludge can be screened out from the water body, and the content of heavy sludge in the water body is increased. The intercepted heavy sludge optimizes the microbial population, improves the sludge settling ratio, increases the microbial concentration in the water body, and prolongs the sludge age, thereby improving the effect of biological denitrification and phosphorus removal in water treatment.

[0058] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will readily appreciate that other variations or modifications based on the above descriptions are possible. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. A sludge screening system, characterized in that: The invention comprises a sludge screening device and a biochemical pool (6), wherein the sludge screening device is arranged in the biochemical pool (6), and the sludge screening device comprises: The main body (1) has a cavity inside, a partition (11) is provided in the cavity, one side of the partition (11) is a screening area (12), and the other side is a concentration area (13), the bottom of the main body (1) is open, and the bottom of the main body (1) is connected to the biochemical pool (6); A filler (2), wherein multiple layers of the filler (2) are arranged in the screening area (12), and four layers of grids (21) are provided on the filler (2), wherein the grids (21) between adjacent layers are staggered, and the grids (21) are polygonal, and the ends of the grids (21) are aligned with the center positions of the grids (21) of the adjacent layers; A mud collecting weir (3) is arranged in the screening area (12) and is located above the filler (2), and the mud collecting weir (3) is connected to the concentration area (13).

2. The sludge screening system according to claim 1, characterized in that: The grid (21) is in the shape of a hexagon, wherein two short sides of the hexagon are parallel and equal in length, and the remaining four sides are parallel in pairs and equal in length.

3. The sludge screening system according to claim 2, characterized in that: A concentration hopper (4) is provided in the concentration zone (13) and is suitable for concentrating sludge.

4. The sludge screening system according to claim 3, characterized in that: Also includes: A water outlet pipe (5) is provided at the upper end of each of the screening area (12) and the concentration area (13), and the water outlet pipe (5) is located above the mud collecting weir (3).

5. The sludge screening system according to claim 4, characterized in that: A mud discharge pipe (41) is provided at the bottom of the concentration hopper (4).

6. The sludge screening system according to claim 5, characterized in that: The filler (2) is a polymer material.

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