Sewage pool desanding device

Abstract

The utility model relates to a sewage pool desanding device, which comprises: a closed desanding device capable of separating settled sand from water; one end of the sand washing pipeline is communicated with the upper part of the closed sand removing equipment, the other end of the sand washing pipeline is used for extending to a sand settling layer at the bottom of the sewage pool, and the sand washing pipeline is provided with a water pump which is used for inputting upper-layer sewage in the closed sand removing equipment into the bottom of the sewage pool; the sand pumping pipeline is communicated with the upper part of the closed sand removing equipment, and the other end of the sand pumping pipeline is used for extending to a sand setting layer at the bottom of the sewage pool. The sand pumping pipeline, the closed desanding equipment, the water pump and the sand washing pipeline form a siphon system, the settled sand is pumped into the closed desanding equipment by using atmospheric pressure, and the water pump is only used for keeping the closed desanding equipment in a negative pressure state and meeting the sand washing requirement, so that the requirement on the water pump can be reduced, and the settled sand in the sewage tank can be easily pumped and removed; damage to the water pump caused by settled sand is avoided, and the service life of the water pump is guaranteed.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of sewage treatment, in particular to a sewage sand removal device. BACKGROUND

[0002] Silt will inevitably be mixed into sewage during migration, flow and collection. During the operation of a sewage treatment plant, silt will deposit in sewage pools such as pumping stations, regulating pools and biochemical pools. During long-term operation of a sewage treatment plant, the silt accumulated in the sewage pools will cause problems such as blockage and wear of water pumps, resulting in a decrease in the inflow or even a stoppage of water, thereby affecting the normal operation of the sewage treatment plant.

[0003] At present, sand removal is usually performed by manual periodic cleaning or by a sand pump. However, both methods have many disadvantages: (1) the manual cleaning process requires a stoppage of water, and the cleaning efficiency is low. In addition, the long-term deposited silt will produce toxic and harmful gases under anaerobic conditions, which threatens the safety of the workers; (2) during the operation of the sand pump, the long-term deposition of silt will form a relatively compact sand layer, which reduces the amount of sand that can be extracted by the sand pump. In addition, the sand pump (or sand suction pipe) has a limited extraction range, so it is difficult to achieve complete removal of the silt. Moreover, during the operation of the sand pump, the silt passes through the cavity of the sand pump, which also causes wear of the sand pump, greatly increasing the risk of failure of the sand pump. The sand pump is arranged in the sewage pool, so it is inconvenient to maintain, which shortens the service life of the sand pump. In particular, for a sewage pool with a deep pool body, it is very difficult to use a sand pump to remove sand, and the flow and head requirements of the pump are very high. CONTENT OF THE UTILITY MODEL

[0004] The present application provides a sewage sand removal device, which arranges a closed sand removal device at the front end of a water pump, so that the silt does not pass through the water pump and manual sand removal is not required, thereby at least partially solving the above technical problems.

[0005] In order to achieve the above purpose, the present application provides a sewage sand removal device, which comprises:

[0006] The closed sand removal device can separate the silt and water;

[0007] The sand flushing pipeline is in communication with the upper part of the closed sand removal device at one end, and the other end of the sand flushing pipeline is used to extend to the bottom of the sewage pool. The sand flushing pipeline is provided with a water pump, so as to input the upper layer of sewage in the closed sand removal device into the silt layer at the bottom of the sewage pool, and the closed sand removal device can maintain a negative pressure state during the sand extraction process; and

[0008] The sand extraction pipeline is in communication with the upper part of the closed sand removal device, and the other end of the sand extraction pipeline is used to extend to the silt layer at the bottom of the sewage pool.

[0009] The closed sand removing device, the sand flushing pipeline and the sand pumping pipeline are connected in airtight manner to form a siphon system, and the mixture of sand and sewage in the sewage pool can be pumped into the closed sand removing device by using atmospheric pressure.

[0010] Optionally, the other end of the sand flushing pipeline and the other end of the sand pumping pipeline are close to each other.

[0011] Optionally, the upper side of the closed sand removing device is further connected with a gas pumping pipeline, and a vacuum pump is arranged on the gas pumping pipeline to pump away the gas in the initial state in the closed sand removing device.

[0012] Optionally, a first switch valve is arranged on the gas pumping pipeline.

[0013] Optionally, the upper side of the closed sand removing device is further connected with a water injection pipeline, the water injection pipeline can input liquid into the closed sand removing device, and a second switch valve is arranged on the water injection pipeline.

[0014] Optionally, one or more sand discharging pipelines are further communicated with the lower part of one side of the closed sand removing device, and a third switch valve is arranged on the sand discharging pipeline.

[0015] Optionally, a fourth switch valve is arranged on the sand flushing pipeline, and a fifth switch valve is arranged on the sand pumping pipeline.

[0016] Optionally, a sliding device is further arranged, the sliding device is drivingly connected with the sand flushing pipeline and the sand pumping pipeline, and is used for driving the sand flushing pipeline and the sand pumping pipeline to move on the sewage pool.

[0017] Optionally, a cyclone sand removing member or a sedimentation sand removing member for quickly separating sand and water is arranged in the closed sand removing device.

[0018] In the embodiment of the present application, the upper layer sewage in the closed sand removal device can be injected into the sewage pool through the sand flushing pipeline with the water pump. Since the sand flushing pipeline extends to the bottom of the sewage pool and the water pump is powered, the sewage extracted by the water pump and injected into the sewage pool can flush away the long-term deposited sand layer, thereby improving the sand extraction amount of the sand extraction pipeline and achieving more thorough sand removal. The closed sand removal device is sealed, so the mixture of the deposited sand and sewage in the sewage pool can continuously enter the closed sand removal device under the action of atmospheric pressure and the water pump, and the separation of sand and water is realized in the closed sand removal device. The sand deposits at the bottom, and the upper layer sewage is extracted by the water pump and returned to the sewage pool. Thus, during the sand removal process, the sand extraction pipeline, the closed sand removal device, the water pump and the sand flushing pipeline are connected in a closed manner to form a siphon system. The water pump is only used to maintain the negative pressure state of the closed sand removal device and meet the sand flushing requirement, thereby avoiding the water pump directly extracting the deposited sand from the bottom of the sewage pool. Therefore, the requirement for the water pump can be reduced, the sand removal process becomes simple, the extraction of the deposited sand at the bottom of the sewage pool mainly relies on the action of atmospheric pressure, and the extraction and removal of the deposited sand can be easily realized. At the same time, compared with the traditional sand removal work by the sand extraction pump, the sewage pool sand removal device of the embodiment of the present application can greatly reduce the lift (or suction) and flow of the water pump, easily and simultaneously realize the complete suction and removal of the deposited sand in the sewage pool, and the closed sand removal device is arranged at the front end of the water pump. Therefore, the extracted deposited sand can be removed at the front end of the water pump, and the deposited sand does not pass through the water pump, preventing the deposited sand from causing wear of the water pump and avoiding damage of the water pump caused by the deposited sand, greatly reducing the risk of water pump failure and ensuring the service life of the water pump. In addition, manual sand removal work is not required, the sand removal efficiency is ensured, and the safety of the operating personnel is also avoided.

[0019] Other features and advantages of the present application will be described in detail in the following specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creating laborious work.

[0021] In order to more completely understand the present application and its beneficial effects, the following will be described in conjunction with the drawings, wherein the same reference numerals in the following description represent the same parts.

[0022] Figure 1 is the overall structure schematic diagram of the sewage pool sand removal device provided in the first exemplary embodiment of the present disclosure;

[0023] Figure 2is a schematic diagram of the overall structure of a sewage desanding device provided in the second example embodiment of the present disclosure;

[0024] Figure 3 is a schematic diagram of the overall structure of a sewage desanding device provided in the third example embodiment of the present disclosure;

[0025] Figure 4 is a schematic diagram of the overall structure of a sewage desanding device provided in the fourth example embodiment of the present disclosure;

[0026] Figure 5 is a schematic diagram of the overall structure of a sewage desanding device provided in the fifth example embodiment of the present disclosure.

[0027] Legend of reference signs:

[0028] 1, closed desanding device;

[0029] 2, sand flushing pipeline;21, water pump;22, fourth on-off valve;

[0030] 3, sand pumping pipeline;31, fifth on-off valve;

[0031] 4, sewage pool;

[0032] 5, air pumping pipeline;51, vacuum pump;52, first on-off valve;

[0033] 6, water injection pipeline;61, second on-off valve;

[0034] 7, sand discharging pipeline;71, third on-off valve;

[0035] 8, sliding device. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the protection scope of the present application.

[0037] With reference to Figure 1 , the present application provides a sewage desanding device, and the sewage desanding device comprises a closed desanding device 1, a sand flushing pipeline 2 and a sand pumping pipeline 3.

[0038] The closed desanding device 1 can separate sand and water, and it can be understood that the closed desanding device 1 can maintain a sealed state, so that the closed desanding device 1 can be in a negative pressure state during sand pumping.

[0039] One end of the sand flushing pipeline 2 is communicated with the upper part of the closed sand removing device 1, and the other end of the sand flushing pipeline 2 is used to extend to the sand layer at the bottom of the sewage pool 4, and the sand flushing pipeline 2 is provided with the water pump 21, so as to input the upper layer sewage in the closed sand removing device 1 to the sand layer at the bottom of the sewage pool 4, so as to flush the long-term deposited sand layer in the sewage pool 4, and the closed sand removing device 1 can keep the negative pressure state during the sand pumping process.

[0040] The sand pumping pipeline 3 is communicated with the upper part of the closed sand removing device 1, and the other end of the sand pumping pipeline 3 is used to extend to the sand layer at the bottom of the sewage pool 4.

[0041] In the embodiment, the closed sand removing device 1, the sand flushing pipeline 2, the water pump 21 and the sand pumping pipeline 3 are always kept in the closed communication state during the sand pumping process, and constitute a siphon system. That is, after the closed sand removing device 1 is filled with liquid, the water pump 21 keeps the negative pressure state, the mixture of sand and water in the sewage pool 4 is input into the closed sand removing device 1 through the sand pumping pipeline 3 under the action of the atmospheric pressure, the separation of sand and water is realized, and the upper layer sewage in the closed sand removing device 1 is input into the sand layer at the bottom of the sewage pool 4 through the water pump 21, so as to realize the circulation process, until the sand in the sewage pool 4 is removed.

[0042] It can be understood that, in the embodiment of the application, the sand flushing pipeline 2 and the sand pumping pipeline 3 are connected to the upper part of the closed sand removing device 1, so that the sand and water mixture pumped out by the sand pumping pipeline 3 can enter from the upper part of the closed sand removing device 1, so as to avoid the collision between the sand and water mixture and the bottom wall of the closed sand removing device 1, so as to ensure that the sand can be quickly deposited to the bottom in the closed sand removing device 1. In addition, the sand flushing pipeline 2 can smoothly extract the sewage in the closed sand removing device 1, and avoid extracting the sand, so as to prevent the sand from entering the water pump 21 and causing damage to the water pump 21.

[0043] In the embodiment of the present application, the upper layer sewage in the closed sand removal device 1 can be injected into the sewage pool 4 through the sand flushing pipeline 2 with the water pump 21. Since the sand flushing pipeline 2 extends to the bottom of the sewage pool 4, and the water pump 21 is powered, the sewage injected into the sewage pool 4 through the water pump 21 can flush the long-term deposited sand layer, thereby increasing the sand pumping amount of the sand pumping pipeline 3 and realizing more thorough sand cleaning. The closed sand removal device 1 is sealed, so that the mixture of the deposited sand and the sewage in the sewage pool 4 can continuously enter the closed sand removal device 1 under the action of atmospheric pressure and the water pump 21, and the separation of sand and water is realized in the closed sand removal device 1. The mud sand is deposited at the bottom, and the upper layer sewage is extracted by the water pump 21 and returned to the sewage pool 4 again. Thus, during the sand removal process, the sand pumping pipeline 3, the closed sand removal device 1, the water pump 21 and the sand flushing pipeline 2 are connected in a closed manner to form a siphon system. The water pump 21 is only used to keep the closed sand removal device 1 in a negative pressure state and meet the sand flushing requirement, thereby avoiding the water pump 21 directly extracting the deposited sand from the bottom of the sewage pool 4. Therefore, the requirement for the water pump 21 can be reduced, the sand removal process is simple, the extraction of the deposited sand at the bottom of the sewage pool is mainly dependent on the action of atmospheric pressure, and the extraction and removal of the deposited sand can be easily realized. At the same time, compared with the traditional sand removal work by the sand pumping pump, the sewage pool sand removal device of the embodiment of the present application can greatly reduce the lift (or suction) and flow of the water pump 21, easily and synchronously realize the complete pumping and removal of the deposited sand in the sewage pool 4, and the closed sand removal device 1 is arranged at the front end of the water pump 21. Therefore, the extracted deposited sand can be removed at the front end of the water pump 21, the deposited sand does not pass through the water pump 21, the wear of the water pump 21 caused by the deposited sand is prevented, the damage of the water pump 21 caused by the deposited sand is avoided, the risk of water pump 21 failure is greatly reduced, and the service life of the water pump 21 is guaranteed. In addition, manual sand cleaning work is not required, the sand cleaning efficiency is guaranteed, and the safety of the operating personnel is also avoided.

[0044] In some embodiments, with reference to Figure 1 , the other end of the sand flushing pipeline 2 and the other end of the sand pumping pipeline 3 are close to each other. Through the above arrangement, the deposited sand layer flushed by the sand flushing pipeline 2 can be immediately pumped into the closed sand removal device 1 by the sand pumping pipeline 3, avoiding the secondary deposition of the deposited sand, so as to guarantee the amount of sand pumped out by the sand pumping pipeline 3 and guarantee the thorough sand cleaning work.

[0045] In some embodiments, with reference to Figure 2, the upper side of the closed sand removing device 1 is also connected with an air extraction pipeline 5, the air extraction pipeline 5 is provided with a vacuum pump 51 to extract the gas in the closed sand removing device 1 in the initial state. It can be understood that, in order to ensure that the closed sand removing device 1 can be filled with liquid before the sand removing work starts, in the embodiment, the gas in the closed sand removing device 1 is first extracted by the vacuum pump 51, so that the closed sand removing device 1 is in a negative pressure state, then the sewage in the sewage pool 4 can flow into the closed sand removing device 1 through the sand extraction pipeline 3 under the action of atmospheric pressure, until the closed sand removing device 1 is filled with liquid; that is, the water storage action of the closed sand removing device 1 can be realized without external water injection. When the closed sand removing device 1 is filled with liquid, the water pump 21 is opened, and the sand removing work can be started.

[0046] In some embodiments, referring to Figure 2 , the air extraction pipeline 5 is provided with a first on-off valve 52. Through the setting of the first on-off valve 52, it can be further ensured that the air extraction pipeline 5 is in a sealed state during the sand removing work after the vacuum pump 51 is closed, so as to avoid the external gas from penetrating into the closed sand removing device 1 from the air extraction pipeline 5, ensure the negative pressure state of the closed sand removing device 1 during the sand removing work, and further ensure the smooth progress of the sand removing work.

[0047] In some embodiments, referring to Figure 3 , the upper side of the closed sand removing device 1 is also connected with a water injection pipeline 6, which can input liquid into the closed sand removing device 1. Therefore, in addition to extracting the gas in the closed sand removing device 1 by the vacuum pump 51 to fill the closed sand removing device 1 with liquid before the specific sand removing work starts, liquid can also be injected into the closed sand removing device 1 through the water injection pipeline 6 to fill the closed sand removing device 1 with liquid. The water injection pipeline 6 is provided with a second on-off valve 61, through the setting of the second on-off valve 61, the opening and closing of the water injection pipeline 6 can be conveniently controlled, so as to ensure that the closed sand removing device 1 is always in a closed negative pressure state during the sand removing work.

[0048] In some embodiments, referring to Figure 4 , the lower side of the closed sand removing device 1 is also connected with one or more sand discharge pipelines 7. Accordingly, when the sand layer in the closed sand removing device 1 is too thick, the internal sand layer can be discharged in time through the sand discharge pipeline 7, so as to ensure the efficiency of sand removing. The sand discharge pipeline 7 is provided with a third on-off valve 71, through the third on-off valve 71, the opening and closing of the sand discharge pipeline 7 can be conveniently controlled, so as to ensure that the closed sand removing device 1 is always in a closed negative pressure state during the sand removing work.

[0049] In some embodiments, referring to Figure 4sand flushing pipe 2 and sand pumping pipe 3 are communicated to opposite sides of the closed sand removing device 1 respectively, i.e. the sand flushing pipe 2 and sand pumping pipe 3 are at a distance, so that after the sand pumping pipe 3 pumps the sand into the closed sand removing device 1, the sand has not yet settled to the bottom but is pumped by the sand flushing pipe 2 and re-enters the sewage pool 4, thereby ensuring a thorough sand removing process.

[0050] Of course, in other embodiments, the sand pumping pipe 3 and sand flushing pipe 2 can also be communicated to adjacent sides of the closed sand removing device 1 respectively.

[0051] In some embodiments, referring to Figure 4 , the sand flushing pipe 2 is provided with a fourth switch valve 22, and the sand pumping pipe 3 is provided with a fifth switch valve 31. Before the sand removing work starts, in the process of filling the closed sand removing device 1 with water by the vacuum pump 51, the sand flushing pipe 2 is closed by the fourth switch valve 22, and the sand pumping pipe 3 is opened by the fifth switch valve 31, so that the closed sand removing device 1 is in a negative pressure state, and the sewage is injected into the closed sand removing device 1 by the sand pumping pipe 3 under the action of atmospheric pressure, thereby ensuring that the closed sand removing device 1 can be filled with liquid before the sand removing work starts, achieving complete discharge of gas in the closed sand removing device 1, and ensuring that there is no gas interference in the siphon system during the sand removing work.

[0052] In some embodiments, referring to Figure 4 , the sand flushing pipe 2 is provided with a fourth switch valve 22, and the sand pumping pipe 3 is provided with a fifth switch valve 31. In the process of filling the closed sand removing device 1 with water by the water injection pipe 6, the sand flushing pipe 2 can be closed by the fourth switch valve 22, and the sand pumping pipe 3 can be closed by the fifth switch valve 31, so that the liquid injected into the closed sand removing device 1 cannot flow to the sewage pool 4 through the sand flushing pipe 2 or the sand pumping pipe 3, thereby ensuring that the closed sand removing device 1 can be filled with liquid before the sand removing work starts, achieving complete discharge of gas in the closed sand removing device 1, and ensuring that there is no gas interference in the siphon system during the sand removing work.

[0053] It can be understood that in the specific implementation process, the type of each of the first switch valve 52, the second switch valve 61, the third switch valve 71, the fourth switch valve 22 and the fifth switch valve 31 can be set as needed, such as a manual valve, an electric valve or other types of valves. In some examples, in order to facilitate the opening and closing action of the valve, the first switch valve 52, the second switch valve 61, the third switch valve 71, the fourth switch valve 22 and the fifth switch valve 31 can all be set as electric switch valves, thereby improving the efficiency of the sand removing work.

[0054] In some embodiments, referring to Figure 5When the sewage pool 4 has a large area, it is difficult to remove all the sand in the sewage pool 4 when the sand flushing pipeline 2 and the sand pumping pipeline 3 are fixed at one position of the sewage pool 4. Therefore, the sewage sand removing device also comprises a sliding device 8, which is drivingly connected with the sand flushing pipeline 2 and the sand pumping pipeline 3, is used for being installed on the sewage pool 4 and driving the sand flushing pipeline 2 and the sand pumping pipeline 3 to move. In the specific sand removing process, after the sand on one side is removed, the sand flushing pipeline 2 and the sand pumping pipeline 3 can be driven by the sliding device 8 to move along the front-back direction, the left-right direction or the depth direction of the sewage pool 4, so that the sand at each position in the sewage pool 4 can be removed, thereby realizing the comprehensive removal of the sand.

[0055] In some embodiments, the sliding device 8 can be installed inside the sewage pool 4, can be installed on the upper part of the sewage pool 4, or can be installed outside the sewage pool 4.

[0056] It also needs to be further explained that in some other embodiments, the underwater end of the sand pumping pipeline 3 can also be lifted to the upper middle position of the sand layer of the sewage pool 4. Before the sand pumping work starts, the sewage in the sewage pool 4 can continuously enter the closed sand removing device 1 under the action of atmospheric pressure when the water is injected into the closed sand removing device 1 by the vacuum pump 51. After the closed sand removing device 1 is filled with liquid, the sand pumping pipeline 3 is driven by the sliding device 8 to move downward along the depth direction of the sewage pool 4 when the sand pumping work starts, so that the sand pumping pipeline 3 extends to the sand layer position of the sewage pool 4, facilitating the subsequent sand pumping process.

[0057] In some embodiments, the closed sand removing device 1 is provided with a cyclone sand removing member or a sedimentation sand removing member for quickly separating sand and water. Through the above-mentioned setting, the separation of sand and water can be accelerated, so that the mud sand can quickly settle to the bottom of the closed sand removing device 1 after entering the closed sand removing device 1 through the cyclone sand removing member or the sedimentation sand removing member arranged in the closed sand removing device 1. Therefore, it can not only avoid that the sand flushing pipeline 2 extracts the sand and reflows into the sewage pool 4, but also can avoid that the sand passes through the water pump 21, prevent the wear of the water pump 21 caused by the sand passing through the water pump 21, avoid the damage of the water pump 21, greatly reduce the risk of failure of the water pump 21, and ensure the service life of the water pump 21.

[0058] It can be understood that in the specific setting, one or more cyclone sand removing members can be separately arranged in the closed sand removing device 1, one or more sedimentation sand removing members can be separately arranged in the closed sand removing device 1, or a combination of the cyclone sand removing member and the sedimentation sand removing member can be arranged in the closed sand removing device 1 to realize the function of separating sand and water.

[0059] In addition, the sedimentation desanding member can be a structure of an inclined pipe, a structure of an inclined plate, a structure of a flat plate or other structure forms.

[0060] In the description of the present application, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0061] In the above embodiments, the description of each embodiment is focused on, and the parts not described in detail in a certain embodiment can be referred to the related description of other embodiments.

[0062] The embodiments, implementation manners and related technical features of the present application can be combined or replaced with each other without conflict.

[0063] The above is only the preferred embodiment of the present application, and does not limit the present application in any form. Any simple modification, equivalent change and modification made to the above embodiment according to the technical essence of the present application without departing from the technical solution content of the present application still belongs to the scope of the technical solution of the present application.

Claims

1. A sand removal device for sewage water, characterized in that, The application relates to a sand removal device, which comprises: a closed sand removal device capable of separating sand and water; a sand flushing pipeline, one end of which is communicated with the upper part of the closed sand removal device, the other end of the sand flushing pipeline is used for extending to the bottom of a sewage pool, the sand flushing pipeline is provided with a water pump for inputting upper sewage in the closed sand removal device into a sand layer at the bottom of the sewage pool, and the closed sand removal device can keep a negative pressure state during sand pumping; and a sand pumping pipeline, one end of which is communicated with the upper part of the closed sand removal device, the other end of the sand pumping pipeline is used for extending to the sand layer at the bottom of the sewage pool. The closed sand removal device, the sand flushing pipeline and the sand pumping pipeline are connected in airtight mode to form a siphon system, and the mixture of sand and sewage in the sewage pool can be pumped into the closed sand removal device by using atmospheric pressure.

2. A grit removal device for sewage water according to claim 1, characterized in that The other end of the sand flushing pipeline and the other end of the sand pumping pipeline are close to each other.

3. A sand removal device for sewage water according to claim 1, characterized in that, The upper side of the closed sand removal device is further connected with a gas pumping pipeline, the gas pumping pipeline is provided with a vacuum pump for pumping away the gas in the initial state of the closed sand removal device.

4. A sewage grit removal apparatus according to claim 3, wherein The gas pumping pipeline is provided with a first switch valve.

5. A sand removal device for sewage water according to claim 1, characterized in that, The upper side of the closed sand removal device is further connected with a water injection pipeline, the water injection pipeline can input liquid into the closed sand removal device, and the water injection pipeline is provided with a second switch valve.

6. A sewage water sand removal device as claimed in claim 1, wherein The lower part of one side of the closed sand removal device is further communicated with one or more sand discharging pipelines, and the sand discharging pipelines are provided with third switch valves.

7. A sand removal device for sewage water according to claim 1, characterized in that The sand flushing pipeline is provided with a fourth switch valve, and the sand pumping pipeline is provided with a fifth switch valve.

8. A sewage water desanding device according to any one of claims 1-7, characterized in that The sand flushing pipeline and the sand pumping pipeline are driven to move on the sewage pool by a sliding device.

9. A sand removal device for sewage water according to claim 1, characterized in that, The closed sand removal device is provided with a cyclone sand removal component or a sedimentation sand removal component for quickly separating sand and water.

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