Equipment for denitrification of sewage sludge using methane oxidation

Abstract

The invention relates to the technical field of denitrification equipment, and specifically discloses denitrification treatment equipment for sewage sludge by methane oxidation, comprising an anaerobic digestion tank, a methane oxidation combustion tank and a denitrification denitrification tank. Water in methane is adsorbed and purified by soda lime in a blocking module, and the methane entering a secondary branch pipe is sensed by a humidity sensor. When the water content is high and reaches a preset value, the humidity sensor transmits data to an external terminal, and respectively controls a first-level solenoid valve, a second-level solenoid valve, a third-level solenoid valve, a fourth-level solenoid valve and a fifth-level solenoid valve to be opened or closed. The heat carried by carbon dioxide generated in the methane oxidation combustion tank is used to heat and dry the soda lime, and the soda lime in another tank is put into use. The soda lime is processed without affecting the methane water purification, so as to facilitate reuse, improve convenience, and the timeliness of the soda lime processing, and ensure the effect of methane water purification.

Description

Technical Field

[0001] The invention belongs to the technical field of denitrification equipment, and in particular relates to denitrification treatment equipment for sewage sludge by utilizing methane oxidation. Background Art

[0002] Sewage sludge denitrification is a process of denitrifying sewage sludge to prevent eutrophication of water bodies. In the prior art, in order to meet the carbon source required for denitrification, an external carbon source is used. However, this method will lead to problems such as high treatment cost, poor economic benefits and waste of resources. Therefore, before the sewage sludge is denitrified, the sewage sludge is first thrown into an anaerobic digestion tank to make the sewage sludge produce methane, and the generated methane is oxidized and burned to generate carbon dioxide, and the carbon dioxide is used as a carbon source to meet the carbon source demand during the decarbonization of the sewage sludge. After the sewage sludge produces methane in the anaerobic digestion tank, the methane needs to be dried and purified to prevent the methane from having too much water and affecting the oxidation and combustion effect of the methane. However, the existing soda lime used for methane drying has a limited service life. After absorbing a certain amount of water, the staff needs to take out the soda lime and fill it with new soda lime. In addition, if the soda lime is not replaced in time, the purification effect of the water in the methane cannot be guaranteed. Summary of the invention

[0003] The object of the present invention is to provide a denitrification treatment device for sewage sludge using methane oxidation to solve the problems raised in the above background technology.

[0004] To achieve the above object, the present invention provides the following technical solutions:

[0005] The denitrification treatment equipment for sewage sludge using methane oxidation includes an anaerobic digestion tank, a methane oxidation combustion tank and a denitrification denitrification tank. The anaerobic digestion tank, the methane oxidation combustion tank and the denitrification denitrification tank are arranged in sequence from left to right. The treated sludge is put into the anaerobic digestion tank. After a certain period of time and conditions, usually 35°C and PH 7, the anaerobic digestion reaction begins to occur, and the organic matter decomposes to produce methane. When collecting methane, it is necessary to dry and purify the methane, so the residual moisture in the methane is adsorbed by soda lime. A methane purification device is provided above the methane oxidation combustion tank, and a heat recovery module is provided outside the methane purification device. The heat recovery module is connected to the methane oxidation combustion tank and the denitrification denitrification tank respectively. By utilizing the heat in the carbon dioxide, the alkali in the two tanks is reduced. Lime is recycled and utilized, that is, the heat carried by the carbon dioxide generated in the methane oxidation combustion tank is used to heat and dry the soda lime, and the soda lime in another tank is put into use, which not only improves the convenience of soda lime treatment, but also improves the timeliness of soda lime treatment. The soda lime treatment is completed without affecting the methane water purification, thereby ensuring the effect of methane water purification. The methane purification device is provided with a sensing module and an interception module, a primary sewage sludge inlet is connected to the middle of the top of the anaerobic digester, a primary sewage sludge outlet is connected to the bottom of the front end of the anaerobic digester, a secondary sewage sludge inlet is connected to the upper end of the front side of the denitrification denitrification tank, a secondary sewage sludge outlet is connected to the bottom of the denitrification denitrification tank, and a nitrogen exhaust pipe is connected to the upper right end of the denitrification denitrification tank.

[0006] Preferably, the methane purification device includes a tank body, a primary conduit, a primary branch pipe, a secondary conduit and a secondary branch pipe. The tank body is symmetrically provided with two groups, and the tank body is located above the methane oxidation combustion tank. There are two groups of primary branch pipes, and the primary branch pipes correspond to the tank body one by one. The primary branch pipe is connected to the middle of the top of the tank body. One end of the primary conduit is connected to the upper right end of the anaerobic digestion tank, and the other end of the primary conduit is communicated with the two groups of primary branch pipes. There are two groups of secondary branch pipes, and the secondary branch pipes correspond to the tank body one by one. The secondary branch pipe is connected to the middle of the bottom end of the tank body. One end of the secondary conduit is connected to the lower left end of the methane oxidation combustion tank, and the other end of the secondary conduit is communicated with the two groups of secondary branch pipes, so that the collected methane is introduced into the methane oxidation combustion tank for oxidative catalytic combustion to produce carbon dioxide.

[0007] Preferably, the methane purification device also includes a primary solenoid valve and a secondary solenoid valve. Two groups of primary solenoid valves are provided, and the primary solenoid valves are respectively provided on two groups of primary branch pipe fittings located on the left side. Two groups of secondary solenoid valves are provided, and the secondary solenoid valves are respectively provided on two groups of secondary branch pipe fittings located on the right side. The humidity sensor is used to sense the moisture of the methane entering the secondary branch pipe fittings at the bottom of the inner cavity of the tank body in use in real time. When the moisture content is high and reaches a preset value, the humidity sensor transmits data to the external terminal, the external terminal receives the data, and controls the opening and closing of the primary solenoid valve or the secondary solenoid valve, thereby realizing the switching between the two groups of tank bodies.

[0008] Preferably, the methane purification device also includes an exhaust pipe fitting and a three-stage solenoid valve. The exhaust pipe fitting is connected to the upper end of the tank body. The three-stage solenoid valve is arranged on the exhaust pipe fitting. When the soda lime in the tank body is dried, the water vapor generated during the drying of the soda lime is discharged through the exhaust pipe fitting connected to the tank body to ensure the drying effect of the soda lime.

[0009] Preferably, the heat recovery module includes an external cover body, a first-level connecting pipe fitting, a second-level connecting pipe fitting, a first-level middle pipe fitting and a second-level middle pipe fitting, the external cover body is connected to the outer wall of the tank body, the first-level middle pipe fitting and the second-level middle pipe fitting are both connected between the left and right groups of external cover bodies, the first-level middle pipe fitting is above the second-level middle pipe fitting, one end of the first-level connecting pipe fitting is connected to the upper end of the methane oxidation combustion tank, the other end of the first-level connecting pipe fitting is connected to the middle of the second-level middle pipe fitting, one end of the second-level connecting pipe fitting is connected to the lower left side of the denitrification denitrification tank, and the other end of the second-level connecting pipe fitting is connected to the middle of the first-level middle pipe fitting, so that carbon dioxide can circulate in the external cover body, so that the heat in the carbon dioxide can be fully utilized before participating in denitrification denitrification, thereby reducing the resource consumption of sewage sludge denitrification.

[0010] Preferably, the heat recovery module also includes a four-level solenoid valve and a five-level solenoid valve, two groups of four-level solenoid valves are provided, and the four-level solenoid valves are respectively arranged on the left side of the first-level middle pipe fitting and the left side of the second-level middle pipe fitting, and the four-level solenoid valve is fitted with the external cover body located on the left side, and two groups of five-level solenoid valves are provided, and the five-level solenoid valves are respectively arranged on the right side of the first-level middle pipe fitting and the right side of the second-level middle pipe fitting, and the five-level solenoid valve is fitted with the external cover body located on the right side, to control the carbon dioxide to enter the external cover body located on the left side or the external cover body located on the right side.

[0011] Preferably, the sensing module includes a humidity sensor and a positioning rod. The humidity sensor is arranged in the middle of the lower inner cavity of the tank body, and the humidity sensor is above the secondary branch pipe. The positioning rod is connected to the outer wall of the humidity sensor, and four groups of positioning rods are provided. The end of the positioning rod away from the humidity sensor is connected to the tank body. The humidity sensor senses the moisture of the methane entering the secondary branch pipe. When the moisture content is high and reaches a preset value, the humidity sensor transmits data to the external terminal, and respectively controls the opening or closing of the first-level solenoid valve, the second-level solenoid valve, the third-level solenoid valve, the fourth-level solenoid valve and the fifth-level solenoid valve. The heat carried by the carbon dioxide generated in the methane oxidation combustion tank is used to heat and dry the soda lime. At the same time, the soda lime in another tank body is put into use. Without affecting the methane moisture purification, the soda lime is processed to facilitate reuse, improve convenience, and the timeliness of the soda lime processing, to ensure the effect of methane moisture purification.

[0012] Preferably, the barrier module includes an assembly ring, a barrier net, soda lime and a mounting plate. The assembly ring is symmetrically arranged in the inner cavity of the tank body, and the outer wall of the assembly ring is in contact with the inner wall of the tank body. The barrier net is connected to the assembly ring, and a gap is left between the barrier net and the humidity sensor. The soda lime is filled between the upper and lower groups of barrier nets. The mounting plate is symmetrically connected to the two ends of the opposite sides of the two groups of assembly rings, and the mounting plate is in contact with the inner wall of the tank body. The mounting plate is fixedly connected to the tank body by positioning bolts, and the soda lime is restricted by the upper and lower groups of barrier nets and in cooperation with the tank body, so that the soda lime is stably located in the middle of the inner cavity of the tank body.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows: when the present invention is in use, the water content in the methane is adsorbed and purified by the soda lime in the barrier module, and the water content of the methane entering the secondary branch pipe is sensed by the humidity sensor. When the water content is high and reaches a preset value, the humidity sensor transmits data to the external terminal, and respectively controls the first-level solenoid valve, the second-level solenoid valve, the third-level solenoid valve, the fourth-level solenoid valve and the fifth-level solenoid valve to be opened or closed. The heat carried by the carbon dioxide generated in the methane oxidation combustion tank is used to heat and dry the soda lime, and the soda lime in another tank is put into use. Without affecting the water content purification of the methane, the soda lime is processed to facilitate reuse, improve convenience, and the timeliness of the soda lime processing, ensure the effect of methane water content purification, and the utilization of carbon dioxide heat improves the utilization rate of resources and reduces resource consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the overall structure of a denitrification treatment device for sewage sludge using methane oxidation.

[0015] Figure 2 Schematic diagram of the tank connection of a denitrification treatment device for sewage sludge using methane oxidation.

[0016] Figure 3 Schematic diagram of a five-stage solenoid valve for denitrification treatment equipment for sewage sludge using methane oxidation.

[0017] Figure 4 This is a schematic diagram of the tank bottom structure of a denitrification treatment device for sewage sludge using methane oxidation.

[0018] Figure 5 Schematic diagram of the internal structure of the tank of a denitrification treatment device for sewage sludge using methane oxidation.

[0019] Figure 6 This is a schematic diagram of the top surface structure of the inner cavity of the tank body of the denitrification treatment equipment for sewage sludge using methane oxidation.

[0020] Figure 7 Schematic diagram of the positioning rods of the denitrification treatment equipment for sewage sludge using methane oxidation.

[0021] Figure 8 Schematic diagram of the barrier net of the denitrification treatment equipment for sewage sludge using methane oxidation.

[0022] In the figure: 1. anaerobic digestion tank; 2. methane oxidation combustion tank; 3. denitrification denitrification tank; 4. heat recovery module; 41. external cover; 42. primary connecting pipe fittings; 43. secondary connecting pipe fittings; 44. primary middle pipe fittings; 45. secondary middle pipe fittings; 46. fourth-level solenoid valve; 47. fifth-level solenoid valve; 5. induction module; 51. humidity sensor; 52. positioning rod; 6. barrier module; 61. assembly ring; 62. barrier net; 63. soda lime; 64. mounting plate; 7. tank body; 8. primary conduit; 9. primary branch pipe fittings; 10. secondary conduit; 11. secondary branch pipe fittings; 12. primary solenoid valve; 13. secondary solenoid valve; 14. exhaust pipe fittings; 15. third-level solenoid valve; 16. primary sewage sludge inlet; 17. primary sewage sludge outlet; 18. secondary sewage sludge inlet; 19. secondary sewage sludge outlet; 20. nitrogen discharge pipe fittings. DETAILED DESCRIPTION

[0023] Example 1

[0024] See also Figure 1-Figure 8As shown, the denitrification treatment equipment for sewage sludge using methane oxidation includes an anaerobic digestion tank 1, a methane oxidation combustion tank 2 and a denitrification denitrification tank 3. The anaerobic digestion tank 1, the methane oxidation combustion tank 2 and the denitrification denitrification tank 3 are arranged in sequence from left to right. The treated sludge is put into the anaerobic digestion tank 1. After a certain period of time and conditions, usually 35°C and a pH of 7, the anaerobic digestion reaction begins to occur, and the organic matter decomposes to produce methane. When collecting methane, it is necessary to dry and purify the methane, so the residual moisture in the methane is adsorbed by soda lime 63. A methane purification device is provided above the methane oxidation combustion tank 2, and a heat recovery module 4 is provided on the outside of the methane purification device. The heat recovery module 4 is respectively connected to the methane oxidation combustion tank 2 and the denitrification denitrification tank 3. By utilizing the heat in the carbon dioxide, the soda lime 63 in the two groups of tank bodies 7 is circulated and utilized, that is, the methane oxidation combustion tank 2 is utilized. The heat carried by the generated carbon dioxide is used to heat and dry the soda lime 63, and the soda lime 63 in the other tank body 7 is put into use, which not only improves the convenience of the soda lime 63 treatment, but also improves the timeliness of the soda lime 63 treatment. The soda lime 63 is treated without affecting the methane water purification, and the methane water purification effect is ensured. The methane purification device is provided with a sensing module 5 and a blocking module 6. The middle of the top of the anaerobic digestion tank 1 is connected to a primary sewage sludge inlet 16, and the bottom of the front end of the anaerobic digestion tank 1 is connected to a primary sewage sludge outlet 17. The upper end of the front side of the denitrification denitrification tank 3 is connected to a secondary sewage sludge inlet 18, and the bottom of the denitrification denitrification tank 3 is connected to a secondary sewage sludge outlet 19. The upper right end of the denitrification denitrification tank 3 is connected to a nitrogen exhaust pipe 20. Carbon dioxide reacts with nitrate in the denitrification denitrification tank 3 to generate nitrogen, and the nitrogen is discharged to achieve denitrification of sewage sludge.

[0025] refer to Figure 1-Figure 6 As shown, the methane purification device includes a tank body 7, a primary conduit 8, a primary branch pipe 9, a secondary conduit 10 and a secondary branch pipe 11. The tank body 7 is symmetrically provided with two groups, and the tank body 7 is located above the methane oxidation combustion tank 2. There are two groups of primary branch pipes 9, and the primary branch pipes 9 correspond to the tank body 7 one by one. The primary branch pipe 9 is connected to the middle of the top of the tank body 7. One end of the primary conduit 8 is connected to the upper right end of the anaerobic digestion tank 1, and the other end of the primary conduit 8 is communicated with the two groups of primary branch pipes 9. There are two groups of secondary branch pipes 11, and the secondary branch pipes 11 correspond to the tank body 7 one by one. The secondary branch pipe 11 is connected to the middle of the bottom end of the tank body 7. One end of the secondary conduit 10 is connected to the lower left end of the methane oxidation combustion tank 2, and the other end of the secondary conduit 10 is communicated with the two groups of secondary branch pipes 11, so that the collected methane is introduced into the methane oxidation combustion tank 2 for oxidative catalytic combustion to produce carbon dioxide.

[0026] refer to Figure 1-Figure 6As shown, the methane purification device also includes a primary solenoid valve 12 and a secondary solenoid valve 13. Two groups of primary solenoid valves 12 are provided, and the primary solenoid valves 12 are respectively provided on two groups of primary branch pipes 9 located on the left side. Two groups of secondary solenoid valves 13 are provided, and the secondary solenoid valves 13 are respectively provided on two groups of secondary branch pipes 11 located on the right side. The humidity sensor 51 is used to sense the moisture of the methane entering the secondary branch pipe 11 at the bottom of the inner cavity of the tank body 7 in use in real time. When the moisture content is high and reaches a preset value, the humidity sensor 51 transmits the data to the external terminal, and the external terminal receives the data and controls the opening and closing of the primary solenoid valve 12 or the secondary solenoid valve 13, thereby realizing the switching between the two groups of tank bodies 7.

[0027] refer to Figure 1 , Figure 2 , Figure 3 , Figure 5 and Figure 6 As shown, the methane purification device also includes an exhaust pipe 14 and a three-stage solenoid valve 15. The exhaust pipe 14 is connected to the upper end of the tank body 7. The three-stage solenoid valve 15 is arranged on the exhaust pipe 14. When the soda lime 63 in the tank body 7 is dried, the water vapor generated during the drying of the soda lime 63 is discharged through the exhaust pipe 14 connected to the tank body 7, thereby ensuring the drying effect of the soda lime 63.

[0028] refer to Figure 1-Figure 6 As shown, the heat recovery module 4 includes an annular external cover body 41, a primary connecting pipe 42, a secondary connecting pipe 43, a primary middle pipe 44 and a secondary middle pipe 45. The external cover body 41 is connected to the outer wall of the tank body 7, the primary middle pipe 44 and the secondary middle pipe 45 are connected between the left and right groups of external cover bodies 41, the primary middle pipe 44 is above the secondary middle pipe 45, one end of the primary connecting pipe 42 is connected to the upper end of the methane oxidation combustion tank 2, the other end of the primary connecting pipe 42 is connected to the middle of the secondary middle pipe 45, one end of the secondary connecting pipe 43 is connected to the lower left side of the denitrification denitrification tank 3, and the other end of the secondary connecting pipe 43 is connected to the middle of the primary middle pipe 44, so that carbon dioxide can circulate in the external cover body 41, so that carbon dioxide can make full use of the heat in carbon dioxide before participating in denitrification denitrification, thereby reducing the resource consumption of sewage sludge denitrification.

[0029] refer to Figure 1-Figure 6As shown, the heat recovery module 4 also includes a four-stage solenoid valve 46 and a five-stage solenoid valve 47. The four-stage solenoid valve 46 is provided with two groups, and the four-stage solenoid valve 46 is respectively arranged on the left side of the first-stage middle pipe fitting 44 and the left side of the second-stage middle pipe fitting 45, and the four-stage solenoid valve 46 is fitted with the external cover body 41 located on the left side. The five-stage solenoid valve 47 is provided with two groups, and the five-stage solenoid valve 47 is respectively arranged on the right side of the first-stage middle pipe fitting 44 and the right side of the second-stage middle pipe fitting 45, and the five-stage solenoid valve 47 is fitted with the external cover body 41 located on the right side, to control the carbon dioxide to enter the external cover body 41 located on the left side or the external cover body 41 located on the right side.

[0030] refer to Figure 5 and Figure 7 As shown, the sensing module 5 includes a humidity sensor 51 and a positioning rod 52. The humidity sensor 51 is arranged in the middle of the lower inner cavity of the tank body 7, and the humidity sensor 51 is located above the secondary branch pipe 11. The positioning rod 52 is connected to the outer wall of the humidity sensor 51, and the positioning rod 52 is provided with four groups. The end of the positioning rod 52 away from the humidity sensor 51 is connected to the tank body 7. The humidity sensor 51 senses the moisture of the methane entering the secondary branch pipe 11. When the moisture is high and reaches a preset value, the humidity sensor 51 transmits the data to the outside. A terminal is provided, and the first-level solenoid valve 12, the second-level solenoid valve 13, the third-level solenoid valve 15, the fourth-level solenoid valve 46 and the fifth-level solenoid valve 47 are respectively controlled to be opened or closed, and the heat carried by the carbon dioxide generated in the methane oxidation combustion tank 2 is used to heat and dry the soda lime 63, and the soda lime 63 in another tank body 7 is put into use. Without affecting the methane water purification, the soda lime 63 is processed to facilitate reuse, improve convenience, and the timeliness of the soda lime 63 processing, to ensure the effect of methane water purification.

[0031] refer to Figure 5 , Figure 6 and Figure 8 As shown, the blocking module 6 includes an assembly ring 61, a blocking net 62, soda lime 63 and a mounting plate 64. The assembly ring 61 is symmetrically arranged in the inner cavity of the tank body 7, and the outer wall of the assembly ring 61 fits with the inner wall of the tank body 7. The blocking net 62 is connected to the assembly ring 61, and a gap is left between the blocking net 62 and the humidity sensor 51. The soda lime 63 is filled between the upper and lower groups of blocking nets 62. The mounting plate 64 is symmetrically connected to the two ends of the opposite side of the two groups of assembly rings 61, and the mounting plate 64 fits with the inner wall of the tank body 7. The mounting plate 64 is fixedly connected to the tank body 7 by positioning bolts, and the soda lime 63 is restricted by the upper and lower groups of blocking nets 62 and in cooperation with the tank body 7, so that the soda lime 63 is stably located in the middle of the inner cavity of the tank body 7.

[0032] Working principle: The treated sludge is put into the anaerobic digestion tank 1 through the primary sewage sludge inlet 16. After a certain period of time and conditions, usually 35°C and pH 7, the anaerobic digestion reaction begins to occur, and the organic matter decomposes to produce methane. After the methane production is completed, the sewage sludge is discharged through the primary sewage sludge outlet 17, and the discharged sewage sludge is collected and introduced into the denitrification denitrification tank 3 through the secondary sewage sludge inlet 18. Carbon dioxide reacts with nitrate in the denitrification denitrification tank 3 to generate nitrogen. The nitrogen generated by denitrification is discharged through the nitrogen discharge pipe 20 to achieve denitrification of the sewage sludge. The denitrified sewage sludge is discharged through the secondary sewage sludge outlet 19.

[0033] When collecting methane, it is necessary to dry and purify the methane, so the residual moisture in the methane is adsorbed by the soda lime 63, and the first-level solenoid valve 12, the third-level solenoid valve 15 on the right and the fifth-level solenoid valve 47 are opened by the external terminal control, and the collected methane enters the tank body 7 on the left, and passes through the barrier net 62 in the barrier module 6, and enters the methane oxidation combustion tank 2 through the second-level branch pipe 11 and the second-level conduit 10 on the left. The methane is oxidized and catalytically burned by the methane oxidation combustion tank 2 to generate carbon dioxide and water. At this time, the carbon dioxide contains a certain amount of heat. The carbon dioxide enters the denitrification tank 3 through the first-level connecting pipe 42, the second-level middle pipe 45, the external cover 41 on the right, the first-level middle pipe 44, and the second-level connecting pipe 43, and the heat in the carbon dioxide is conducted into the tank body 7 on the right, and the soda lime 63 that has not been put into use is dried, and the residual moisture is discharged through the exhaust pipe 14, so as to ensure the dryness of the soda lime 63 that has not been put into use.

[0034] The humidity sensor 51 senses the moisture of the methane entering the secondary branch pipe 11 at the bottom of the inner cavity of the tank body 7 on the left in real time. When the moisture is high and reaches a preset value, the humidity sensor 51 transmits the data to the external terminal, which receives the data and controls the first-level solenoid valve 12, the third-level solenoid valve 15 on the right, and the fifth-level solenoid valve 47 to close, and the second-level solenoid valve 13, the third-level solenoid valve 15 on the left, and the fourth-level solenoid valve 46 to open. The collected methane enters the tank body 7 on the right, and continues to adsorb the moisture of the methane by using dry soda lime 63. At this time, the methane Carbon dioxide will circulate in the external cover body 41 located on the left, that is, carbon dioxide enters the denitrification tank 3 through the primary connecting pipe 42, the secondary middle pipe 45, the external cover body 41 located on the left, the primary middle pipe 44, and the secondary connecting pipe 43, and the heat in the carbon dioxide is conducted into the tank body 7 located on the left to dry the soda lime 63 with high humidity. Thus, by utilizing the heat in the carbon dioxide, the soda lime 63 in the two groups of tank bodies 7 can be circulated and utilized, which not only improves the convenience of the soda lime 63 treatment, but also improves the timeliness of the soda lime 63 treatment.

[0035] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A denitrification treatment device for sewage sludge using methane oxidation, comprising an anaerobic digestion tank (1), a methane oxidation combustion tank (2) and a denitrification denitrification tank (3), characterized in that: The anaerobic digestion tank (1), the methane oxidation combustion tank (2) and the denitrification denitrification tank (3) are arranged in sequence from left to right. A methane purification device is arranged above the methane oxidation combustion tank (2). A heat recovery module (4) is arranged outside the methane purification device. The heat recovery module (4) is connected to the methane oxidation combustion tank (2) and the denitrification denitrification tank (3) respectively. A sensing module (5) and a blocking module (6) are arranged inside the methane purification device. A primary sewage sludge inlet (16) is connected to the middle of the top of the anaerobic digestion tank (1). A primary sewage sludge outlet (17) is connected to the bottom of the front end of the anaerobic digestion tank (1). A secondary sewage sludge inlet (18) is connected to the upper end of the front side of the denitrification denitrification tank (3). A secondary sewage sludge outlet (19) is connected to the bottom of the denitrification denitrification tank (3). A nitrogen gas discharge pipe (20) is connected to the upper right end of the denitrification denitrification tank (3). The methane purification device comprises a tank body (7), a primary conduit (8), a primary branch pipe (9), a secondary conduit (10) and a secondary branch pipe (11), wherein the tank body (7) is provided with two groups symmetrically on the left and right, and the tank body (7) is located above the methane oxidation combustion tank (2), the primary branch pipe (9) is provided with two groups, and the primary branch pipes (9) correspond to the tank body (7) one by one, the primary branch pipe (9) is connected to the middle of the top of the tank body (7), and one end of the primary conduit (8) is connected to the Above the right end of the anaerobic digestion tank (1), the other end of the primary conduit (8) is connected to two groups of primary branch pipes (9), two groups of secondary branch pipes (11) are provided, and the secondary branch pipes (11) correspond to the tank body (7) one by one, and the secondary branch pipes (11) are connected to the middle of the bottom end of the tank body (7), one end of the secondary conduit (10) is connected to the lower left end of the methane oxidation combustion tank (2), and the other end of the secondary conduit (10) is connected to the two groups of secondary branch pipes (11); The heat recovery module (4) comprises an external cover body (41), a first-level connecting pipe fitting (42), a second-level connecting pipe fitting (43), a first-level middle pipe fitting (44) and a second-level middle pipe fitting (45); the external cover body (41) is connected to the outer wall of the tank body (7); the first-level middle pipe fitting (44) and the second-level middle pipe fitting (45) are both connected between the left and right sets of external cover bodies (41); the first-level middle pipe fitting (44) is located above the second-level middle pipe fitting (45); one end of the first-level connecting pipe fitting (42) is connected to the upper end of the methane oxidation combustion tank (2); the other end of the first-level connecting pipe fitting (42) is connected to the middle of the second-level middle pipe fitting (45); one end of the second-level connecting pipe fitting (43) is connected to the lower left side of the denitrification and denitrification tank (3); the other end of the second-level connecting pipe fitting (43) is connected to the middle of the first-level middle pipe fitting (44); The heat recovery module (4) further comprises a four-stage solenoid valve (46) and a five-stage solenoid valve (47); two groups of the four-stage solenoid valve (46) are provided, and the four-stage solenoid valve (46) is respectively provided on the left side of the first-stage middle pipe fitting (44) and the left side of the second-stage middle pipe fitting (45), and the four-stage solenoid valve (46) is fitted with an external cover body (41) located on the left side; two groups of the five-stage solenoid valve (47) are provided, and the five-stage solenoid valve (47) is respectively provided on the right side of the first-stage middle pipe fitting (44) and the right side of the second-stage middle pipe fitting (45), and the five-stage solenoid valve (47) is fitted with an external cover body (41) located on the right side.

2. The denitrification treatment equipment for sewage sludge using methane oxidation according to claim 1, characterized in that: The methane purification device further comprises a first-level solenoid valve (12) and a second-level solenoid valve (13); two groups of the first-level solenoid valve (12) are provided, and the first-level solenoid valve (12) is respectively provided on two groups of first-level branch pipe fittings (9) located on the left side; and two groups of the second-level solenoid valve (13) are provided, and the second-level solenoid valve (13) is respectively provided on two groups of second-level branch pipe fittings (11) located on the right side.

3. The denitrification treatment equipment for sewage sludge using methane oxidation according to claim 1, characterized in that: The methane purification device further comprises an exhaust pipe (14) and a three-stage solenoid valve (15); the exhaust pipe (14) is connected to the upper end of the tank body (7); and the three-stage solenoid valve (15) is arranged on the exhaust pipe (14).

4. The denitrification treatment equipment for sewage sludge using methane oxidation according to claim 1, characterized in that: The sensing module (5) comprises a humidity sensor (51) and a positioning rod (52); the humidity sensor (51) is arranged in the middle of the lower part of the inner cavity of the tank body (7), and the humidity sensor (51) is located above the secondary branch pipe (11); the positioning rod (52) is connected to the outer wall of the humidity sensor (51), and the positioning rod (52) is provided with four groups; one end of the positioning rod (52) away from the humidity sensor (51) is connected to the tank body (7).

5. The denitrification treatment equipment for sewage sludge using methane oxidation according to claim 1, characterized in that: The blocking module (6) comprises an assembly ring (61), a blocking net (62), soda lime (63) and a mounting plate (64). The assembly ring (61) is symmetrically arranged in the inner cavity of the tank body (7) in a vertical direction, and the outer wall of the assembly ring (61) is in contact with the inner wall of the tank body (7). The blocking net (62) is connected to the inside of the assembly ring (61), and a gap is left between the blocking net (62) and the humidity sensor (51). The soda lime (63) is filled between the upper and lower groups of blocking nets (62). The mounting plate (64) is symmetrically connected to the two ends of the opposite sides of the two groups of assembly rings (61), and the mounting plate (64) is in contact with the inner wall of the tank body (7). The mounting plate (64) is fixedly connected to the tank body (7) by positioning bolts.

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