Biogas recycling device for sewage treatment

Abstract

The utility model discloses a biogas recycling device for sewage treatment, which relates to the technical field of biogas recycling and comprises a sewage tank, an impurity removal mechanism and a gas storage mechanism. Wherein the sewage tank is connected with the impurity removal mechanism through a connecting pipe I, and the impurity removal mechanism is connected with the gas storage mechanism through a connecting pipe II; a sewage inlet mechanism is inserted into the side, away from the first connecting pipe, of the top end of the sewage tank, and a blow-down valve is arranged at the bottom of the sewage tank. According to the utility model, the impurity removal mechanism and the gas storage mechanism are arranged in a matched manner, so that other gases and moisture in the biogas can be absorbed, and the purity and dryness of the recycled biogas are improved, thereby improving the quality of biogas recycling and further greatly improving the utilization rate of the biogas; by arranging the sewage inlet mechanism, under the action that a floating ball floats on the surface of sewage, a blocking column can move to the position under a sewage inlet through pipe, the sewage inlet through pipe is completely blocked, the sewage does not flow into the sewage tank any more, and therefore it is guaranteed that the water level in the sewage tank does not affect emission of biogas.

Description

Technical Field

[0001] The utility model relates to the technical field of biogas recovery, in particular to a biogas recovery and reuse device for sewage treatment. Background Art

[0002] Biogas, the name of which is directly inspired by the natural discovery in the swamps; in the embrace of nature, biogas frequently appears in swamps, sewage treatment systems and wetlands with rich fecal deposits, escaping from the water in the form of bubbles and being easily ignited, demonstrating its excellent combustion performance and energy value. Under a specific reducing environment, carefully controlled temperature and pH conditions, through a series of precise microbial fermentation, various organic substances are converted into a composite gas, namely biogas. The core component of biogas is methane, supplemented by other gas components such as carbon dioxide, trace amounts of nitrogen, hydrogen and hydrogen sulfide. In order to ensure the safe and efficient use of biogas, it is particularly important to remove impurities in it.

[0003] For example, Chinese patent CN214612452U discloses a slaughterhouse biogas utilization device, including a biogas tank, a controller, a connecting pipe, a collection tank and a pumping plate. By introducing a sodium hydroxide solution into a first water tank, and then introducing a copper sulfate solution into a second water tank, and inserting the first water tank and the second water tank into the collection tank through the pumping plate, the carbon dioxide and hydrogen sulfide gas at the bottom of the collection tank are absorbed to increase the purity of the biogas generated in the biogas tank. However, when the above-mentioned biogas utilization device absorbs other gases in the biogas through the solution in the water tank, it only relies on the other gases to precipitate downward and contact and react with the solution, which will cause the purity of the biogas located above to be much lower than the purity of the biogas located below, thereby greatly reducing the purity of the recovered biogas, and further greatly affecting the utilization rate of the biogas.

[0004] Currently, no effective solution has been proposed for the problems in the related technologies. Utility Model Content

[0005] In view of the problems in the related technology, the utility model proposes a biogas recovery and reuse device for sewage treatment to overcome the above technical problems existing in the existing related technology.

[0006] To this end, the specific technical solutions adopted by the utility model are as follows:

[0007] A biogas recovery and reuse device for sewage treatment comprises a sewage tank, a debris removal mechanism and a gas storage mechanism; wherein the sewage tank is connected to the debris removal mechanism via a connecting pipe 1, and the debris removal mechanism is connected to the gas storage mechanism via a connecting pipe 2; a sewage inlet mechanism is interspersed on a side of the top of the sewage tank away from the connecting pipe 1, and a sewage discharge valve is provided at the bottom of the sewage tank.

[0008] Furthermore, in order to control the sewage level in the sewage tank and ensure that it does not affect the discharge of biogas, the float can float on the sewage surface so that the float moves up as the sewage level continues to rise, so that the connecting rod pulls the push-pull rod to move away from the blocking column. When the water level in the sewage tank reaches a certain position, the blocking column will move to the bottom of the sewage inlet pipe and completely block the sewage inlet pipe so that the sewage will no longer flow into the sewage tank, thereby preventing the water level in the sewage tank from moving up. The sewage inlet mechanism includes A sewage inlet pipe is inserted and arranged on the top of the sewage tank, a blocking column is arranged inside the sewage inlet pipe, a push-pull rod is arranged at one end of the blocking column, and a connecting column is arranged at the end of the push-pull rod away from the blocking column; a lifting ear is arranged at the bottom end of the sewage inlet pipe, the bottom end of the lifting ear is movably connected with the connecting rod, the top end of the connecting rod is provided with a slot 1 which matches the connecting column, and a float is arranged at the bottom end of the connecting rod; the sewage inlet pipe is a four-way pipe with a cross-shaped structure, and the through pipe above the sewage inlet pipe is the sewage inlet through pipe; the connecting column is located inside the slot 1; the angle between the push-pull rod and the connecting rod is an acute angle.

[0009] Furthermore, in order to reduce the content of carbon dioxide in biogas, biogas can be filled into the impurity removal box through the outlet pipe, and the aeration pipe, baffle and convex block can be used to divide the gas, so that the biogas can be broken into small bubbles and fully contact and react with the sodium hydroxide solution in the impurity removal box. At the same time, the action of the bubbles also promotes the flow of the solution and enhances the reaction rate of the solution, so that the solution can fully absorb the carbon dioxide in the biogas, thereby greatly improving the quality of biogas recovery. The impurity removal mechanism includes a impurity removal box, and a connecting pipe connected to the impurity removal box is provided inside. A connecting pipe three is provided, a plurality of air outlet pipes are arranged on the top of the connecting pipe three, an aeration pipe is arranged on the top of the air outlet pipe, the aeration pipe and the air outlet pipe are fixedly connected by a plurality of support rods, a plurality of baffles are arranged above the support rods, and a plurality of protrusions are arranged on the top side wall inside the aeration pipe and above the baffles; the height of the connecting pipe three is lower than the height of the connecting pipe two; one side of the baffle is arranged as an arcuate surface, the other side of the baffle is arranged as a vertical surface, and the arcuate surface of the baffle is connected to the inner wall of the aeration pipe; the baffle is arranged obliquely, and the vertical surfaces of the two baffles are arranged to be cross-shaped in an X shape.

[0010] Furthermore, in order to reduce the moisture content of the recovered biogas and the content of hydrogen sulfide gas in the biogas, the sponge mesh layer can absorb excess moisture in the biogas under the adsorption effect of water, and the desulfurizer filter layer can absorb hydrogen sulfide gas in the biogas under the absorption effect of hydrogen sulfide gas, thereby greatly improving the quality of biogas recovery. The gas storage mechanism includes a gas storage box, and a plurality of card slots 2 are arranged at the bottom of both side walls of the gas storage box. The interiors of the two groups of card slots 2 are sequentially arranged with sponge mesh layers and desulfurizer filter layers in a direction away from the connecting pipe 2, and an air outlet valve is arranged at the top of one end of the gas storage box.

[0011] Furthermore, in order to improve the efficiency of biogas recovery, the biogas generated by the sewage can be quickly sent into the impurity removal mechanism for impurity removal under the action of the exhaust fan, and an exhaust fan is arranged in the middle of the connecting pipe.

[0012] The beneficial effects of the utility model are:

[0013] 1. The utility model can absorb other gases and moisture in biogas through the coordinated arrangement of the impurity removal mechanism and the gas storage mechanism, improve the purity and dryness of the recovered biogas, thereby improving the quality of biogas recovery and greatly improving the utilization rate of biogas.

[0014] 2. By setting up a sewage inlet mechanism, the float can float on the sewage surface, so that the float will move up as the sewage level continues to rise, so that the connecting rod pulls the push-pull rod to move away from the blocking column. When the water level in the sewage tank reaches a certain position, the blocking column will move to the bottom of the sewage inlet pipe and completely block the sewage inlet pipe so that sewage will no longer flow into the sewage tank, thereby preventing the water level in the sewage tank from moving up, thereby ensuring that it will not affect the discharge of biogas.

[0015] 3. By setting up the impurity removal mechanism, the biogas can be broken up into small bubbles under the action of filling the impurity removal box with biogas through the outlet pipe and the gas segmentation by the aeration pipe, baffle and convex block, so that the biogas can be fully contacted and reacted with the sodium hydroxide solution in the impurity removal box. At the same time, the action of the bubbles also promotes the flow of the solution and enhances the reaction rate of the solution, so that the solution can fully absorb the carbon dioxide gas in the biogas, thereby greatly improving the quality of biogas recovery.

[0016] 4. By setting up a gas storage mechanism, the sponge mesh layer can absorb excess water in the biogas under the adsorption effect of water, and the desulfurizer filter layer can absorb hydrogen sulfide gas in the biogas under the absorption effect of hydrogen sulfide gas, thereby greatly improving the quality of biogas recovery. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 It is a structural schematic diagram of a biogas recovery and reuse device for sewage treatment according to an embodiment of the utility model;

[0019] Figure 2 yes Figure 1 The enlarged view of point A in the middle;

[0020] Figure 3 yes Figure 1 The enlarged view of point B in the middle;

[0021] Figure 4 This is one of the partial cross-sectional views of a biogas recovery and reuse device for sewage treatment according to an embodiment of the utility model;

[0022] Figure 5 This is a second partial cross-sectional view of a biogas recovery and reuse device for sewage treatment according to an embodiment of the utility model;

[0023] Figure 6 It is a three-dimensional assembly diagram of a sewage inlet mechanism in a biogas recovery and reuse device for sewage treatment according to an embodiment of the utility model;

[0024] Figure 7 This is a third partial cross-sectional view of a biogas recovery and reuse device for sewage treatment according to an embodiment of the utility model;

[0025] Figure 8 yes Figure 7 Enlarged view of point C in the middle;

[0026] Fig. 9 This is a fourth partial cross-sectional view of a biogas recovery and reuse device for sewage treatment according to an embodiment of the utility model;

[0027] Fig.10 It is a structural schematic diagram of a baffle in a biogas recovery and reuse device for sewage treatment according to an embodiment of the utility model;

[0028] Fig.11 This is a fifth partial cross-sectional view of a biogas recovery and reuse device for sewage treatment according to an embodiment of the utility model.

[0029] In the figure:

[0030] 1. Sewage tank; 2. Sewage inlet mechanism; 201. Sewage inlet pipe; 20101. Sewage inlet pipe; 202. Blocking column; 203. Push-pull rod; 204. Connecting column; 205. Lifting ear; 206. Connecting rod; 207. Slot 1; 208. Float; 3. Connecting pipe 1; 301. Exhaust fan; 4. De-impurity mechanism; 401. De-impurity box; 402. Connecting pipe 3; 403. Air outlet pipe; 404. Aeration pipe; 405. Support rod; 406. Baffle; 407. Bump; 408. Drain valve; 5. Connecting pipe 2; 6. Gas storage mechanism; 601. Gas storage box; 602. Slot 2; 603. Sponge mesh layer; 604. Desulfurizer filter layer; 605. Air outlet valve; 7. Sewage valve. DETAILED DESCRIPTION

[0031] To further illustrate each embodiment, the present invention provides drawings, which are part of the disclosure of the present invention and are mainly used to illustrate the embodiments. They can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these contents, ordinary technicians in the field should be able to understand other possible implementation methods and advantages of the present invention. The components in the figures are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0032] According to an embodiment of the utility model, a biogas recovery and reuse device for sewage treatment is provided.

[0033] The present invention is now further described in conjunction with the accompanying drawings and specific implementation methods. Figure 1-11 As shown, the biogas recovery and reuse device for sewage treatment according to the embodiment of the utility model includes a sewage tank 1, a debris removal mechanism 4 and a gas storage mechanism 6; wherein the sewage tank 1 is connected to the debris removal mechanism 4 through a connecting pipe 1 3, and the debris removal mechanism 4 is connected to the gas storage mechanism 6 through a connecting pipe 2 5; a sewage inlet mechanism 2 is interspersed on the side of the top of the sewage tank 1 away from the connecting pipe 1 3, and a sewage discharge valve 7 is provided at the bottom of the sewage tank 1.

[0034] With the aid of the above technical scheme of the utility model, the utility model can absorb other gases and moisture in biogas through the coordinated arrangement of the impurity removal mechanism 4 and the gas storage mechanism 6, thereby improving the purity and dryness of the recovered biogas, thereby improving the quality of biogas recovery, and further greatly improving the utilization rate of biogas.

[0035] In one embodiment, for the above-mentioned sewage inlet mechanism 2, the sewage inlet mechanism 2 includes a sewage inlet pipe 201 inserted and arranged on the top of the sewage tank 1, a blocking column 202 is arranged inside the sewage inlet pipe 201, a push-pull rod 203 is arranged at one end of the blocking column 202, and a connecting column 204 is arranged at the end of the push-pull rod 203 away from the blocking column 202; a lifting ear 205 is arranged at the bottom end of the sewage inlet pipe 201, and the bottom end of the lifting ear 205 is movably connected with a connecting rod 206, and a slot 207 matching with the connecting column 204 is opened at the top of the connecting rod 206, and a floating ball 208 is arranged at the bottom end of the connecting rod 206; the sewage inlet pipe 201 is a four-way pipe with a cross-shaped structure, and the through pipe above the sewage inlet pipe 201 is a sewage inlet. The through pipe 20101; the connecting column 204 is located inside the slot 207; the angle between the push-pull rod 203 and the connecting rod 206 is an acute angle; the float 208 can float on the sewage surface, so that the float 208 moves upward as the sewage water level continues to rise, so that the connecting rod 206 pulls the push-pull rod 203 to move away from the blocking column 202. When the water level in the sewage tank 1 reaches a certain position, the blocking column 202 will move to the bottom of the sewage inlet through pipe 20101, and completely block the sewage inlet through pipe 20101 so that the sewage no longer flows into the sewage tank 1, thereby making the water level in the sewage tank 1 no longer move up, thereby ensuring that it will not affect the discharge of biogas.

[0036] In addition, it should be noted that the above-mentioned float 208 is a hollow structure, and the float 208 has a certain weight to ensure that it can float up and down in the fluid. The diameter and shape of the float 208 are designed to automatically float when a certain liquid level is reached in the fluid. The float 208 is a prior art and will not be elaborated in detail here.

[0037] The working principle of the sewage inlet mechanism 2 is as follows: sewage is introduced into the sewage tank 1 through the sewage inlet pipe 20101. As the water level continues to rise, the float 208 can float on the water surface and move upward continuously. Under the fixing action of the lifting ear 205, the connecting rod 206 moves in an arc shape. At the same time, under the cooperation of the connecting column 204 and the slot 1 207, the push-pull rod 203 is driven to move away from the blocking column 202. When the water level in the sewage tank 1 reaches a certain position, the blocking column 202 will move to the bottom of the sewage inlet pipe 20101 and completely block the sewage inlet pipe 20101 so that the sewage will no longer flow into the sewage tank 1, thereby making the water level in the sewage tank 1 no longer move upward, thereby ensuring that it will not affect the discharge of biogas. Finally, the sewage in the sewage tank 1 that has generated biogas can be discharged by opening the sewage valve 7.

[0038] In one embodiment, for the above-mentioned impurity removal mechanism 4, the impurity removal mechanism 4 includes an impurity removal box 401, a connecting pipe 3 402 connected to the connecting pipe 1 3 is arranged inside the impurity removal box 401, a plurality of air outlet pipes 403 are arranged on the top of the connecting pipe 3 402, an aeration pipe 404 is arranged on the top of the air outlet pipe 403, the aeration pipe 404 and the air outlet pipe 403 are fixedly connected by a plurality of support rods 405, a plurality of baffles 406 are arranged above the support rods 405, and a plurality of protrusions 407 are arranged on the top side wall inside the aeration pipe 404 and above the baffle 406; the height of the position where the connecting pipe 3 402 is located is lower than the height of the position where the connecting pipe 2 5 is located; one side of the baffle 406 is arranged in an arc shape. The other side of the baffle 406 is set as a vertical surface, and the arc surface of the baffle 406 is connected to the inner wall of the aeration pipe 404; the baffle 406 is inclined, and the vertical surfaces of the two baffles 406 are cross-set to form an X shape; under the action of the outlet pipe 403 filling the impurity removal box 401 with biogas, and under the action of the aeration pipe 404, the baffle 406 and the protrusion 407 to divide the gas, the biogas is broken into small bubbles and fully contacted and reacted with the sodium hydroxide solution in the impurity removal box 401, and at the same time, the action of the bubbles promotes the flow of the solution and enhances the reaction rate of the solution, so that the solution can fully absorb the carbon dioxide gas in the biogas, thereby greatly improving the quality of biogas recovery.

[0039] In addition, in specific applications, the impurity removal box 401 contains sodium hydroxide solution, and the connecting pipe three 402 is submerged by the sodium hydroxide solution in the impurity removal box 401. At the same time, the water level of the sodium hydroxide solution in the impurity removal box 401 is lower than the height of the connecting pipe two 5, so as to ensure that the gas after the reaction in the impurity removal box 401 can enter the gas storage mechanism 6 through the connecting pipe two 5.

[0040] The working principle of the impurity removal mechanism 4 is as follows: under the action of biogas being filled into the impurity removal box 401 through the gas outlet pipe 403, the gas can be passed into the aeration pipe 404, and under the blocking action of the baffle 406 and the protrusion 407, the biogas can be divided into small bubbles, and fully contacted and reacted with the sodium hydroxide solution in the impurity removal box 401. At the same time, the flow of the solution is promoted under the action of the bubbles, and the reaction rate of the solution is enhanced, so that the solution can fully absorb the carbon dioxide gas in the biogas, thereby greatly improving the quality of biogas recovery. Finally, the waste liquid after the reaction in the impurity removal box 401 can be discharged by opening the drain valve 408.

[0041] In one embodiment, for the above-mentioned gas storage mechanism 6, the gas storage mechanism 6 includes a gas storage box 601, and a plurality of card slots 602 are arranged at the bottom of both side walls of the gas storage box 601. The interiors of the two groups of card slots 602 are sequentially arranged with sponge mesh layers 603 and desulfurizer filter layers 604 in a direction away from the connecting pipe 5, and an outlet valve 605 is arranged at the top of one end of the gas storage box 601; it can absorb excess water in the biogas under the adsorption effect of the sponge mesh layer 603 on water, and absorb hydrogen sulfide gas in the biogas under the absorption effect of the desulfurizer filter layer 604 on hydrogen sulfide gas, thereby greatly improving the quality of biogas recovery.

[0042] In addition, in specific applications, the sponge mesh layer 603 and the desulfurizing agent filter layer 604 are of the same size and are both inclined, and they will divide the gas storage box 601 into three chambers.

[0043] In addition, it should be noted that the above-mentioned sponge mesh layer 603 is a mesh material similar to a sponge structure. Since the sponge mesh layer 603 is often composed of many tiny pores and channels, these structures make the sponge mesh layer 603 water-absorbent. The sponge mesh layer 603 is a prior art and will not be elaborated in detail here.

[0044] In addition, it should be noted that the above-mentioned desulfurizer filter layer 604 is a dry desulfurization. The desulfurizer filter layer contains desulfurizers such as iron oxide, activated carbon, zinc oxide, etc. These materials are loaded into a bed or fixed in the filter. When the biogas containing hydrogen sulfide passes through these materials, the hydrogen sulfide reacts with the desulfurizer to generate stable sulfide or elemental sulfur, which is then removed. The desulfurizer filter layer 604 is a prior art and will not be elaborated on here.

[0045] In addition, it should be noted that the above-mentioned drain valve 7, drain valve 408 and air outlet valve 605 are all composed of a valve body, a valve flap, a seal, a drive mechanism and connecting parts. Their working principle is to control the flow of liquid or gas based on the opening and closing of the valve flap. The composition and working principle of the drain valve 7, drain valve 408 and air outlet valve 605 are existing technologies and will not be elaborated in detail here.

[0046] The working principle of the gas storage mechanism 6 is as follows: the biogas is introduced into the gas storage box 601 through the connecting pipe 25, so that the biogas passes through the sponge mesh layer 603 and the desulfurizer filter layer 604 in turn, so that the excess moisture and hydrogen sulfide gas in the biogas are absorbed, thereby greatly improving the quality of biogas recovery. At the same time, the moisture adsorbed by the sponge mesh layer 603 will slide along the side wall of the gas storage box 601 to the bottom of the gas storage box 601, and finally the biogas can be connected to the place where it is needed through the outlet valve 605, and then the recovered biogas can be released for use by opening the outlet valve 605.

[0047] In one embodiment, for the above-mentioned connecting pipe 3, an exhaust fan 301 is provided in the middle of the connecting pipe 3; under the action of the exhaust fan 301, the biogas generated by the sewage can be quickly sent into the impurity removal mechanism 4 for impurity removal, and a certain rate of continuous gas supply can be maintained to prevent the solution in the impurity removal box 401 from flowing back.

[0048] In order to facilitate understanding of the above technical solution of the present invention, the working principle or operation method of the present invention in the actual process is described in detail below.

[0049] In actual application, sewage is introduced into the sewage tank 1 through the sewage inlet mechanism 2, and the sewage is left to ferment for a period of time. The biogas is then sent to the impurity removal mechanism 4 for impurity removal through the connecting pipe 1 3, and then the impurity-removed biogas is sent to the gas storage mechanism 6 through the connecting pipe 2 5. The excess moisture and hydrogen sulfide gas in the biogas are absorbed through the gas storage mechanism 6 to improve the recovery quality of the biogas.

[0050] In summary, with the aid of the above-mentioned technical scheme of the utility model, through the coordinated arrangement of the impurity removal mechanism 4 and the gas storage mechanism 6, other gases and moisture in the biogas can be absorbed, the purity and dryness of the recovered biogas can be improved, thereby improving the quality of biogas recovery, and then greatly improving the utilization rate of the biogas; by arranging the sewage inlet mechanism 2, the float 208 can float on the sewage surface, so that the float 208 moves upward as the sewage water level continues to rise, so that the connecting rod 206 pulls the push-pull rod 203 to move away from the blocking column 202. When the water level in the sewage tank 1 reaches a certain position, the blocking column 202 will move to the bottom of the sewage inlet pipe 20101, and completely block the sewage inlet pipe 20101 so that the sewage no longer flows into the sewage tank 1, thereby making the water level in the sewage tank 1 no longer rise. By setting up the impurity removal mechanism 4, the biogas can be broken up into small bubbles and fully contact and react with the sodium hydroxide solution in the impurity removal box 401 under the action of biogas being filled into the impurity removal box 401 by the outlet pipe 403, and the gas segmentation by the aeration pipe 404, the baffle 406 and the protrusion 407. At the same time, the flow of the solution is promoted under the action of the bubbles, and the reaction rate of the solution is enhanced, so that the carbon dioxide gas in the biogas is fully absorbed, thereby greatly improving the quality of biogas recovery; by setting up the gas storage mechanism 6, the sponge mesh layer 603 can absorb the excess water in the biogas, and the desulfurizer filter layer 604 can absorb the hydrogen sulfide gas in the biogas, thereby greatly improving the quality of biogas recovery.

[0051] In the present utility model, unless otherwise clearly stipulated and limited, the terms such as "installation", "setting", "connection", "fixation" and "screw-on" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. Unless otherwise clearly defined, ordinary technicians in this field can understand the specific meanings of the above terms in the utility model according to the specific circumstances.

[0052] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A biogas recovery and reuse device for sewage treatment, characterized in that: It comprises a sewage tank (1), a debris removal mechanism (4) and a gas storage mechanism (6); Wherein, the sewage tank (1) is connected to the impurity removal mechanism (4) via a connecting pipe 1 (3), and the impurity removal mechanism (4) is connected to the gas storage mechanism (6) via a connecting pipe 2 (5); A sewage inlet mechanism (2) is inserted and arranged on the top of the sewage tank (1) away from the connecting pipe (3) on one side, and a sewage discharge valve (7) is arranged at the bottom of the sewage tank (1); The impurity removal mechanism (4) comprises an impurity removal box (401), wherein a connecting pipe three (402) connected to the connecting pipe one (3) is arranged inside the impurity removal box (401), a plurality of air outlet pipes (403) are arranged on the top of the connecting pipe three (402), an aeration pipe (404) is arranged on the top of the air outlet pipe (403), the aeration pipe (404) and the air outlet pipe (403) are fixedly connected via a plurality of support rods (405), a plurality of baffles (406) are arranged above the support rods (405), and a plurality of protrusions (407) are arranged on the top side wall inside the aeration pipe (404) and above the baffles (406); A drain valve (408) is provided at the bottom of one end of the impurity removal box (401).

2. A biogas recovery and reuse device for sewage treatment according to claim 1, characterized in that: The sewage inlet mechanism (2) comprises a sewage inlet pipe (201) inserted into the top of the sewage tank (1), a blocking column (202) is arranged inside the sewage inlet pipe (201), a push-pull rod (203) is arranged at one end of the blocking column (202), and a connecting column (204) is arranged at one end of the push-pull rod (203) away from the blocking column (202); The bottom end of the sewage inlet pipe (201) is provided with a lifting ear (205), the bottom end of the lifting ear (205) is movably connected to a connecting rod (206), the top end of the connecting rod (206) is provided with a slot (207) that matches the connecting column (204), and the bottom end of the connecting rod (206) is provided with a floating ball (208).

3. The biogas recovery and reuse device for sewage treatment according to claim 1, characterized in that: The gas storage mechanism (6) comprises a gas storage box (601), the bottoms of both side walls of the gas storage box (601) are provided with a plurality of second card slots (602), the interiors of the two groups of second card slots (602) are provided with a sponge net layer (603) and a desulfurizing agent filter layer (604) in sequence along a direction away from the second connecting pipe (5), and a gas outlet valve (605) is provided at the top of one end of the gas storage box (601).

4. The biogas recovery and reuse device for sewage treatment according to claim 1, characterized in that: An exhaust fan (301) is provided in the middle of the connecting pipe 1 (3).

5. The biogas recovery and reuse device for sewage treatment according to claim 2, characterized in that: The sewage inlet pipe (201) is a four-way pipe with a cross-shaped structure, and the through pipe above the sewage inlet pipe (201) is the sewage inlet through pipe (20101).

6. The biogas recovery and reuse device for sewage treatment according to claim 2, characterized in that: The connecting column (204) is located inside the first card slot (207).

7. The biogas recovery and reuse device for sewage treatment according to claim 2, characterized in that: The included angle between the push-pull rod (203) and the connecting rod (206) is an acute angle.

8. The biogas recovery and reuse device for sewage treatment according to claim 3, characterized in that: The height of the location of the connecting pipe three (402) is lower than the height of the location of the connecting pipe two (5).

9. The biogas recovery and reuse device for sewage treatment according to claim 1, characterized in that: One side of the baffle (406) is configured as an arcuate surface, the other side of the baffle (406) is configured as a vertical surface, and the arcuate surface of the baffle (406) is connected to the inner wall of the aeration pipe (404); The baffle (406) is arranged obliquely, and the vertical surfaces of the two baffles (406) are arranged to cross each other in an X shape.

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