Aerobic granular sludge screening device

Abstract

The utility model provides an aerobic granular sludge screening device, which relates to the technical field of sludge screening, and comprises a tank body and a screen drum, the tank body is provided with a sludge inlet and a granular sludge discharge port, the arrangement height of the sludge inlet on the tank body is higher than that of the granular sludge discharge port, and the opening orientation of the sludge inlet is parallel to the circumferential tangential direction of the tank body. Sludge entering the tank body through the sludge inlet forms rotational flow, the screen drum is arranged in the tank body, and the screen drum is connected with the floc sludge discharge port. Screening is carried out by utilizing a centrifugal principle and a screen filtering mode, required aerobic granular sludge can be efficiently intercepted and effectively selected, and it is guaranteed that sludge flowing back to a biological tank is granular sludge with better settling performance, better biological enrichment capacity and higher impact resistance; the problems of low growth speed and low sludge density of the aerobic granular sludge at the present stage are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of sludge screening, in particular to an aerobic granular sludge screening device. Background Art

[0002] Compared with traditional activated sludge methods, aerobic granular sludge has better sedimentation performance, better bioaccumulation capacity, and stronger impact resistance. Each aerobic granular sludge can be called a miniature sewage treatment plant because COD removal and nitrogen and phosphorus removal can be achieved in a tiny particle. No supporting carrier is required, the sludge concentration is high, there is no sludge swelling, the land requirements are reduced, and the construction and operation costs can be reduced.

[0003] At present, the academic community generally believes that aerobic granular sludge (AGS) reactors can be inoculated with ordinary activated sludge, and then under appropriate conditions, the activated sludge will eventually develop from flocculent to granular state. The initial particle size of the inoculated sludge in the reactor is about 100μm, while the conventional definition size of aerobic granular sludge is >200μm, so it takes some time for the first small particle to appear in the reactor. The sedimentation behavior of all original particles is the same as other sludge in sewage, so selective sludge discharge is ineffective, and each particle has the same probability of being discharged. Therefore, it is currently difficult to obtain high-density granular sludge in aerobic tanks. In response to the above problems, this application is proposed. Utility Model Content

[0004] The purpose of the utility model is to provide an aerobic granular sludge screening device, which can efficiently intercept the required aerobic granular sludge and effectively select it, thereby solving the current problems of slow growth rate and low sludge density of aerobic granular sludge.

[0005] In order to solve the above problems, the utility model provides an aerobic granular sludge screening device, including a tank body and a sieve cylinder, the tank body is provided with a mud inlet and a granular sludge discharge port, the mud inlet is set at a height on the tank body higher than the height of the granular sludge discharge port, the mud inlet opening is parallel to the circumferential tangent direction of the tank body, so that the sludge to be separated enters the tank body from the circumferential tangent direction, causing a vortex, which is conducive to the concentration of heavy granular sludge and sedimentation along the tank wall, and is discharged through the granular sludge discharge port at the bottom, the sieve cylinder is arranged in the tank body, and the bottom of the sieve cylinder is connected to the floc sludge discharge port, and the floc sludge discharge port is arranged on the outside of the tank body. Due to its small particle size, the floc sludge can easily pass through the sieve cylinder and be discharged through the floc sludge discharge port at the bottom of the sieve cylinder.

[0006] According to an embodiment of the present invention, the sieve drum is arranged at the center of the tank body, and is fixedly connected or detachably connected such as snap-on or threaded, and the axis of the sieve drum coincides with the center axis of the tank body.

[0007] According to an embodiment of the present invention, the sieve drum is composed of a filter screen, and the filter screen holes of the filter screen are circular, polygonal or wedge-shaped, and can also be set to a combination of various filter screen hole shapes.

[0008] Optionally, the filtration accuracy of the sieve cylinder is 50 to 250 μm.

[0009] According to an embodiment of the present invention, a mud inlet valve, a mud inlet pump and a mud inlet flow meter are provided at the mud inlet.

[0010] According to an embodiment of the present invention, a mud discharge valve, a mud discharge pump and a mud discharge flow meter are provided at the floc sludge discharge port.

[0011] According to an embodiment of the present invention, a sludge discharge valve, a sludge discharge pump and a sludge discharge flow meter are provided at the granular sludge discharge port.

[0012] According to an embodiment of the present invention, the aerobic granular sludge screening device further includes a cleaning mechanism, which is used to clean the sieve drum. The cleaning mechanism can be arranged inside the sieve drum or outside the sieve drum.

[0013] According to an embodiment of the present invention, the cleaning mechanism includes a spiral body, a brush is provided on the inner surface of the spiral body, and the spiral body is sleeved on the periphery of the screen cylinder.

[0014] According to an embodiment of the present invention, the cleaning mechanism further includes a driving module, which is connected to the spiral body. The driving module can be a motor, a lifting driving module, etc.

[0015] According to an embodiment of the present invention, the brush is detachably connected to the spiral body, so as to be easily replaced.

[0016] The beneficial effect of the utility model is that, by utilizing the centrifugal principle and the screen filtration method for screening, the required aerobic granular sludge can be efficiently intercepted and effectively selected, ensuring that the sludge returned to the biological pool has better sedimentation performance, better biological enrichment ability, and stronger impact resistance. The granular sludge solves the current problems of slow growth rate and low sludge density of aerobic granular sludge. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0018] Figure 1 This is a schematic diagram of the overall structure of the aerobic granular sludge screening device;

[0019] Figure 2 It is a structural diagram of the screen drum and cleaning mechanism;

[0020] In the figure: 1-tank body, 2-sludge inlet, 3-granular sludge discharge port, 4-screen cylinder, 5-floc sludge discharge port, 6-cleaning mechanism, 41-filter screen, 61-spiral body, 62-brush. DETAILED DESCRIPTION

[0021] The following description is intended only to disclose the present invention and to enable those skilled in the art to implement the present invention. The embodiments described below are provided for illustrative purposes only, and those skilled in the art will readily appreciate other obvious variations. The basic principles of the present invention as defined in the following description may be applied to other embodiments, variations, improvements, equivalents, and other solutions that do not depart from the spirit and scope of the present invention.

[0022] Example 1:

[0023] An aerobic granular sludge screening device, such as Figure 1 The invention comprises a tank body 1 and a screen drum 4. The tank body 1 is provided with a sludge inlet 2 and a granular sludge discharge port 3. The tank body 1 preferably adopts a structure that is wide at the top and narrow at the bottom. The sludge inlet 2 is provided with a sludge inlet valve, a sludge inlet pump, and a sludge inlet flowmeter. The granular sludge discharge port 3 is provided with a sludge discharge valve, a sludge discharge pump, and a sludge discharge flowmeter. The sludge inlet 2 is provided at a higher height on the tank body 1 than the granular sludge discharge port 3. The opening of the sludge inlet 2 is parallel to the circumferential tangent direction of the tank body 1, so that the sludge to be separated enters the tank body 1 from the circumferential tangent direction, creating a swirling flow, which is conducive to the concentration of heavy granular sludge and its sedimentation along the tank wall. It is discharged through the granular sludge discharge port 3 at the bottom, and the granular sludge is returned to the aerobic reaction zone of the sewage biological treatment.

[0024] In other embodiments, the extended line of the opening direction of the mud inlet 2 may not intersect the central axis of the tank body 1 , as long as the sludge entering the tank body 1 can generate a vortex.

[0025] In other embodiments, the mud inlet 2 may be movably mounted on the tank body 1, and its orientation angle may be adjusted.

[0026] like Figure 1 The sieve drum 4 is arranged in the tank body 1, and the sieve drum 4 is arranged at the center position of the tank body 1. The axis of the sieve drum 4 coincides with the center axis of the tank body 1. In other embodiments, multiple sieve drums 4 can also be set. The sieve drum 4 is composed of a filter screen 41. The filter screen holes of the filter screen 41 are preferably polygonal holes, and the filtration accuracy of the filter screen holes is 50 to 250 μm.

[0027] The bottom of the sieve cylinder 4 is connected to the floc sludge discharge port 5, which is arranged on the outside of the tank body 1. The floc sludge can easily pass through the sieve cylinder 4 due to its small particle size and be discharged through the floc sludge discharge port 5 at the bottom of the sieve cylinder 4. The floc sludge flows to the secondary sedimentation tank of the sewage treatment plant as residual sludge. A sludge discharge valve, a sludge discharge pump and a sludge discharge flow meter are provided at the floc sludge discharge port 5.

[0028] Example 2:

[0029] On the basis of Example 1, Figure 1 、 Figure 2 In this embodiment, a cleaning mechanism 6 is further included. The cleaning mechanism 6 is used to clean the sieve drum 4. The cleaning mechanism 6 is arranged outside the sieve drum 4 and can adopt structures such as an annular brush and a plate brush.

[0030] Preferably, the cleaning mechanism 6 includes a spiral body 61, on the inner surface of which a brush 62 is detachably mounted, and the spiral body 61 is sleeved around the periphery of the sieve drum 4. The cleaning mechanism 6 also includes a drive module connected to the spiral body 61. The drive module is preferably a motor, which is disposed outside the tank and connected to the spiral body 61 via a transmission mechanism. The motor drives the spiral body 61 to rotate to clean the filter 41 and prevent the filter 41 from being clogged. The cleaning device 6 can operate continuously or intermittently.

[0031] Those skilled in the art will appreciate that the embodiments of the present invention described above and shown in the accompanying drawings are intended only as examples and do not limit the present invention. The objectives of the present invention have been fully and effectively achieved. The functional and structural principles of the present invention have been demonstrated and illustrated in the embodiments. Any variations and modifications may be made to the embodiments of the present invention without departing from the principles described.

Claims

1. An aerobic granular sludge screening device, characterized by: The invention comprises a tank body (1) and a sieve drum (4); the tank body (1) is provided with a mud inlet (2) and a granular sludge discharge port (3); the mud inlet (2) is arranged at a height on the tank body (1) higher than the height of the granular sludge discharge port (3); the mud inlet (2) opens in a direction parallel to the circumferential tangent direction of the tank body (1); the sludge entering the tank body (1) through the mud inlet (2) forms a vortex; the sieve drum (4) is arranged in the tank body (1) and is connected to the flocculent sludge discharge port (5).

2. The aerobic granular sludge screening device according to claim 1, characterized in that: The sieve drum (4) is arranged at the center of the tank body (1), and the axis of the sieve drum (4) coincides with the center axis of the tank body (1).

3. The aerobic granular sludge screening device according to claim 2, characterized in that: The sieve drum (4) is composed of a filter screen (41), and the filter screen holes of the filter screen (41) are circular, polygonal or wedge-shaped.

4. The aerobic granular sludge screening device according to claim 3, characterized in that: The filtration accuracy of the sieve drum (4) is 50 to 250 μm.

5. The aerobic granular sludge screening device according to any one of claims 1 to 4, characterized in that: The mud inlet (2) is provided with a mud inlet valve, a mud inlet pump and a mud inlet flow meter.

6. The aerobic granular sludge screening device according to claim 5, characterized in that: The flocculent sludge discharge port (5) and the granular sludge discharge port (3) are both provided with a sludge discharge valve, a sludge discharge pump and a sludge discharge flow meter.

7. The aerobic granular sludge screening device according to any one of claims 1 to 4, characterized in that: The aerobic granular sludge screening device further comprises a cleaning mechanism (6), wherein the cleaning mechanism (6) is used to clean the screen drum (4).

8. The aerobic granular sludge screening device according to claim 7, characterized in that: The cleaning mechanism (6) comprises a spiral body (61), the inner surface of which is provided with a brush (62), and the spiral body (61) is sleeved on the periphery of the screen cylinder (4).

9. The aerobic granular sludge screening device according to claim 8, characterized in that: The cleaning mechanism (6) further comprises a driving module, and the driving module is connected to the spiral body (61).

10. The aerobic granular sludge screening device according to claim 8 or 9, characterized in that: The brush (62) is detachably connected to the spiral body (61).

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