Sludge discharge device applied to circular secondary sedimentation tank and secondary sedimentation tank

Abstract

The utility model provides a sludge discharge device applied to a circular secondary sedimentation tank and a secondary sedimentation tank, the sludge discharge device comprises a sludge discharge hopper, a folding block and a buoy, the sludge discharge hopper is mounted in the secondary sedimentation tank, and a sludge scraper in the secondary sedimentation tank rotates around the center of the secondary sedimentation tank; the top of the sludge discharging hopper is open, and a sludge discharging opening is formed in the bottom of the sludge discharging hopper; a folding block is arranged on the side wall, facing the mud scraping plate, of the mud discharging hopper and comprises a plurality of folding layers, the bottom of the folding block is fixed, and the top of the folding block can be unfolded in the direction away from the mud discharging hopper; the buoy is mounted at the top of one side, far away from the sludge discharge hopper, of the folding block, and an air-water regulating valve is arranged on the buoy; and the top of the sludge discharge hopper and the float bowl are higher than the liquid level of the secondary sedimentation tank. According to the utility model, the air-water proportion of the float bowl is adjusted by utilizing the float bowl principle, so that the float bowl drives the sludge discharge port to ascend or descend along with the ascending or descending of the liquid level, the sludge discharge port is kept to be higher than the liquid level by a proper height, and floating sludge can conveniently enter the sludge discharge hopper to be discharged, thereby improving the sludge discharge efficiency of the secondary sedimentation tank.

Description

Technical Field

[0001] The utility model relates to the technical field of sewage treatment, and in particular to a mud discharge device applied to a circular secondary sedimentation tank and the secondary sedimentation tank. Background Art

[0002] The sedimentation tank after biological treatment is usually called the secondary sedimentation tank or the final sedimentation tank (final sedimentation tank). The function of the secondary sedimentation tank is to separate mud and water, clarify the mixed liquor, concentrate the sludge and return the separated sludge to the biological treatment section. The effect of the secondary sedimentation tank directly affects the water quality of the effluent and the concentration of the return sludge. If the sedimentation and concentration effects are not good, the activated sludge suspended matter will increase in the effluent, thereby increasing the BOD mass concentration of the effluent; at the same time, the concentration of the return sludge will also decrease, thereby reducing the concentration of the mixed liquor in the aeration tank and affecting the purification effect.

[0003] The existing Chinese patent with publication number CN101879382A discloses a sewage secondary sedimentation tank, including a clarifier, the clarifier is provided with a tank body, the interior of the tank body is vertically divided into a clarification area, a separation area, a storage area and a concentration area, the sewage inlet pipe at the bottom of the tank body enters the tank body through the bottom plate of the tank body, a central guide tube is provided on the top of the inlet pipe, a sludge hopper is provided at the bottom of the tank body, a sludge discharge pipe is provided in the sludge hopper, the sludge discharge pipe is connected to the sludge discharge pump, a sludge scraper bridge is provided in the tank body, a water outlet weir plate is provided around the periphery of the tank body, a plurality of groups of return sludge scrapers are provided on the sludge scraper bridge on the periphery of the tank body, a sludge conduit is fixed on the sludge scraper bridge, the end of the sludge conduit is provided above the sludge hopper in the center of the tank body, and the front end of the sludge conduit is provided on the return sludge scraper plate.

[0004] In the current circular secondary sedimentation tank, the height of the sludge discharge port is fixed. As the amount of treated water increases, the liquid level rises, the difference between the liquid level and the sludge discharge port is small, and the sludge discharge effect is good. However, as the amount of treated water decreases, the liquid level drops, the difference between the liquid level and the sludge discharge port increases, and it is difficult for the scraper to scrape the floating sludge into the sludge discharge bucket. The sludge discharge efficiency is low, resulting in more floating sludge on the pool surface, affecting the sludge discharge and the pool surface sensory perception.

[0005] Therefore, the inventor believes that it is necessary to provide a sludge discharge device for use in a circular secondary sedimentation tank so that the height difference between the liquid level and the sludge discharge port is maintained at a certain height, and the sludge can be effectively discharged after the sewage treatment volume increases or decreases, thereby improving the sludge discharge efficiency of the secondary sedimentation tank. Utility Model Content

[0006] In view of the defects in the prior art, the purpose of the utility model is to provide a mud discharge device applied to a circular secondary sedimentation tank and a secondary sedimentation tank.

[0007] According to the utility model, a mud discharge device applied to a circular secondary sedimentation tank includes: a mud discharge bucket, a folding block and a float, the mud discharge bucket is installed in the secondary sedimentation tank, and the mud scraper in the secondary sedimentation tank rotates around the center of the secondary sedimentation tank; the top of the mud discharge bucket is set in an open state, and the bottom of the mud discharge bucket is provided with a mud discharge port; a side wall of the mud discharge bucket facing the mud scraper is the folding block, the folding block includes a plurality of folding layers, and its bottom is fixed, and the top can be unfolded in the direction away from the mud discharge bucket; the float is installed at the top of the folding block on the side away from the mud discharge bucket, and the float is provided with an air-water regulating valve; the top of the mud discharge bucket and the float are both higher than the liquid level of the secondary sedimentation tank.

[0008] Preferably, the buoy is 5 cm higher than the water surface of the secondary sedimentation tank.

[0009] Preferably, the buoy is arranged parallel to the liquid surface.

[0010] Preferably, the buoy comprises a cylindrical buoy, and the air-water regulating valve is arranged on a bottom surface of the buoy and is located at the top of the bottom surface.

[0011] Preferably, the folding block includes 1 to 7 folding layers.

[0012] Preferably, the unfolding range of the folding block is between 45-90 degrees.

[0013] Preferably, each side wall of the scraper blade is arranged obliquely, and the length of the bottom edge of the side wall is smaller than the length of the top edge.

[0014] Preferably, the length of the scraper blade exceeds the distance between the sludge hopper and the center of the secondary sedimentation tank.

[0015] Preferably, the folding block comprises a rubber folding block, and the buoy comprises a stainless steel buoy.

[0016] According to a secondary sedimentation tank provided by the utility model, the above-mentioned mud discharge device applied to the circular secondary sedimentation tank is adopted, and it also includes the secondary sedimentation tank and the mud scraper. The mud discharge device is installed at the inner edge position of the secondary sedimentation tank.

[0017] Compared with the prior art, the utility model has the following beneficial effects:

[0018] 1. The utility model utilizes the float principle to adjust the air-water ratio of the float, so that when the float rises or falls with the liquid level, the mud discharge port is driven to rise or fall, and the mud discharge port is kept at an appropriate height above the liquid surface, which is convenient for floating mud to enter the mud discharge bucket for discharge. After the sewage treatment volume increases or decreases, the mud can be effectively discharged, thereby improving the mud discharge efficiency of the secondary sedimentation tank.

[0019] 2. The utility model keeps a certain distance between the highest point of the float and the water surface to prevent mud or other debris from staying on the float and pressing the float to sink and cause water overflow; the air-water regulating valve is arranged at the top of the float to prevent water from entering the float after the air-water regulating valve is not sealed tightly and leaks, thereby improving the mud discharge efficiency of the secondary sedimentation tank.

[0020] 3. The utility model uses an air-water regulating valve to timely adjust the air-water ratio inside the float 3 according to the size and material of the float, thereby greatly improving the work efficiency; the folding block adopts a rubber folding block, and the number of folding layers can be determined according to the manufacturing material, and the unfolding range of the folding block is between 45-90 degrees, which effectively ensures the height difference between the mud discharge port and the liquid surface, thereby improving the mud discharge efficiency of the secondary sedimentation tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Other features, objects and advantages of the present invention will become more apparent by reading the detailed description of non-limiting embodiments with reference to the following drawings:

[0022] Figure 1 This is a front view of the sludge discharge device mainly applied to a circular secondary sedimentation tank in the utility model;

[0023] Figure 2 This is a side view of a mud discharge device mainly applied to a circular secondary sedimentation tank in accordance with the utility model;

[0024] Figure 3 This is a top view of the sludge discharge device mainly applied to a circular secondary sedimentation tank in accordance with the utility model;

[0025] Figure 4 The utility model mainly embodies a schematic diagram of a mud discharge device applied to a circular secondary sedimentation tank installed in the secondary sedimentation tank.

[0026] Reference numerals:

[0027] Mud bucket 1 Folding block 2 Float 3

[0028] Air and water regulating valve 4 Mud discharge port 5 Mud scraper 6

[0029] Secondary sedimentation tank 7 DETAILED DESCRIPTION

[0030] The utility model is described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the utility model, but do not limit the utility model in any form. It should be pointed out that for those of ordinary skill in the art, several changes and improvements can be made without departing from the concept of the utility model. These all belong to the protection scope of the utility model.

[0031] Example 1

[0032] like Figure 1-4 As shown, according to the utility model, a mud discharge device applied to a circular secondary sedimentation tank includes: a mud discharge bucket 1, a folding block 2 and a float 3, the mud discharge bucket 1 is installed in the secondary sedimentation tank 7, and the scraper 6 in the secondary sedimentation tank 7 rotates around the center of the secondary sedimentation tank 7; the top of the mud discharge bucket 1 is open, and a mud discharge port 5 is provided at the bottom of the mud discharge bucket 1; a side wall of the mud discharge bucket 1 facing the scraper 6 is a folding block 2, the folding block 2 includes a plurality of folding layers, and its bottom is fixed, and the top can be unfolded in a direction away from the mud discharge bucket 1; the float 3 is installed at the top of the folding block 2 on the side away from the mud discharge bucket 1, and an air-water regulating valve 4 is provided on the float 3; the top of the mud discharge bucket 1 and the float 3 are both higher than the liquid level of the secondary sedimentation tank 7.

[0033] This application is different from the conventional fixed mud outlet of the circular secondary sedimentation tank. As the amount of treated water decreases, the liquid level decreases, and the height difference between the liquid level and the mud outlet increases, it is difficult for the scraper to scrape the floating mud into the mud outlet. This application uses the float principle to adjust the air-water ratio of the float 3 so that the float 3 can automatically rise or fall with the rise or fall of the liquid level. The length of the mud scraper 6 exceeds the distance between the mud outlet 1 and the center of the secondary sedimentation tank 7. When the mud scraper 6 scrapes to the mud outlet 5, it can discharge mud more efficiently.

[0034] Preferably, the float 3 is arranged parallel to the liquid surface, and the float 3 is 5 cm higher than the water surface of the secondary sedimentation tank 7. Generally, the floating mud is about 3 cm thick above the water surface, and the highest point of the float is 5 cm above the water surface to prevent mud or other debris from occasionally staying on the float and pressing the float to sink and cause water overflow. The float 3 can automatically adjust the height of the mud inlet 5 of the mud discharge bucket 1 according to the change of the production water volume in the secondary sedimentation tank 7, keep the mud discharge port 5 above the liquid surface at an appropriate height, and facilitate the floating mud to enter the mud discharge bucket 1 and discharge the floating mud.

[0035] The buoy 3 includes a cylindrical buoy, and the air-water regulating valve 4 is arranged on a bottom surface of the buoy 3 and is located at the top of the bottom surface to prevent the buoy 3 from entering the water after the air-water regulating valve 4 is not sealed tightly and leaks, and the buoy 3 sinks and causes the water in the secondary sedimentation tank to overflow. The buoy 3 is generally a stainless steel buoy. The air-water ratio inside the buoy 3 is difficult to fix, and it depends on the size and material of the buoy 3. If the buoy 3 is made large, the material is thicker, and the weight is heavy, the corresponding air-water ratio will be larger, and it will be adjusted according to the actual situation on site.

[0036] The folding block 2 includes a rubber folding block. The folding block 2 includes 1 to 7 folding layers, and the number of folding layers of the folding block 2 can be determined according to the manufacturing material. The unfolding range of the folding block 2 is between 45 and 90 degrees.

[0037] Each side wall of the scraper blade 6 is inclined, and the length of the bottom edge of the side wall is smaller than the length of the top edge.

[0038] Before use, first open the gas-water regulating valve 4 to adjust the gas-water ratio inside the float 3, keep the float 3 above the water surface at an appropriate height, when the water treatment volume increases, the liquid level rises, the float 3 floats up and drives the component 2 to rise, when the water treatment volume decreases, the liquid level drops, the stainless steel float of the component 3 sinks and drives the folding block 2 to drop, the distance of the float 3 on the water surface remains unchanged, when the scraper 6 scrapes the float 3, the floating mud can easily enter the mud discharge port 5. The present application can automatically adjust the height of the mud discharge port 5 with the liquid level when the liquid level rises or falls, increase the mud discharge efficiency of the secondary sedimentation tank, and purify the pool surface.

[0039] Example 2

[0040] According to a secondary sedimentation tank provided by the utility model, the mud discharge device applied to the circular secondary sedimentation tank described in Example 1 is adopted, and also includes a secondary sedimentation tank 7 and a mud scraper 6, and the mud discharge device is installed at the inner edge of the secondary sedimentation tank 7. The present application utilizes the float principle to adjust the air-water ratio of the float 3, so that the float 3 can automatically drive the mud discharge port 5 to rise or fall as the liquid level rises or falls. The length of the mud scraper 6 exceeds the distance between the mud discharge bucket 1 and the center of the secondary sedimentation tank 7. When the mud scraper 6 scrapes to the mud discharge port 5, the mud can be discharged more efficiently. The present application can automatically adjust the height of the mud discharge port 5 with the liquid level when the liquid level rises or falls, thereby increasing the mud discharge efficiency of the secondary sedimentation tank and purifying the pool surface.

[0041] In the description of the present application, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0042] The above describes the specific embodiments of the present invention. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art can make various changes or modifications within the scope of the claims, which does not affect the essence of the present invention. In the absence of conflict, the embodiments of the present application and the features in the embodiments can be combined with each other at will.

Claims

1. A mud discharge device applied to a circular secondary sedimentation tank, characterized in that: include: A mud discharge bucket (1), a folding block (2) and a buoy (3), wherein the mud discharge bucket (1) is installed in a secondary sedimentation tank (7), and a mud scraper (6) in the secondary sedimentation tank (7) rotates around the center of the secondary sedimentation tank (7); The top of the mud discharge bucket (1) is arranged in an open state, and the bottom of the mud discharge bucket (1) is provided with a mud discharge port (5); A side wall of the mud discharge bucket (1) facing the mud scraper (6) is the folding block (2), and the folding block (2) includes a plurality of folding layers, and its bottom is fixed, and its top can be unfolded in a direction away from the mud discharge bucket (1); The buoy (3) is installed on the top of the folding block (2) on the side away from the mud bucket (1), and an air-water regulating valve (4) is provided on the buoy (3); The top of the mud discharge hopper (1) and the buoy (3) are both higher than the liquid level of the secondary sedimentation tank (7).

2. The mud discharge device for circular secondary sedimentation tank according to claim 1, characterized in that: The buoy (3) is 5 cm higher than the water surface of the secondary sedimentation tank (7).

3. The mud discharge device for circular secondary sedimentation tank according to claim 1, characterized in that: The buoy (3) is arranged parallel to the liquid surface.

4. The mud discharge device for circular secondary sedimentation tank according to claim 1, characterized in that: The buoy (3) comprises a cylindrical buoy, and the air-water regulating valve (4) is arranged on a bottom surface of the buoy (3) and is located at the top of the bottom surface.

5. The mud discharge device for circular secondary sedimentation tank according to claim 1, characterized in that: The folding block (2) comprises 1 to 7 folding layers.

6. The mud discharge device for circular secondary sedimentation tank according to claim 1, characterized in that: The unfolding range of the folding block (2) is between 45 and 90 degrees.

7. The mud discharge device for circular secondary sedimentation tank according to claim 1, characterized in that: Each side wall of the scraper blade (6) is arranged obliquely, and the length of the bottom edge of the side wall is smaller than the length of the top edge.

8. The mud discharge device for circular secondary sedimentation tank according to claim 1, characterized in that: The length of the scraper blade (6) exceeds the distance between the mud discharge bucket (1) and the center of the secondary sedimentation tank (7).

9. The mud discharge device for circular secondary sedimentation tank according to claim 1, characterized in that: The folding block (2) comprises a rubber folding block, and the buoy (3) comprises a stainless steel buoy.

10. A secondary sedimentation tank, characterized in that: The mud discharge device applied to a circular secondary sedimentation tank according to any one of claims 1 to 9 further comprises the secondary sedimentation tank (7) and the mud scraper (6), and the mud discharge device is installed at the inner edge of the secondary sedimentation tank (7).

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