Anaerobic tank based on sewage treatment

Abstract

The invention belongs to the technical field of sewage treatment, and particularly relates to an anaerobic tank based on sewage treatment, which comprises a heat insulation anaerobic tank, a metal lining shell is fixedly embedded in the inner wall of the heat insulation anaerobic tank, and the bottom end of the metal lining shell is filled with a biological filler layer. The inner wall of the heat insulation anaerobic tank and the outer wall of the metal lining shell jointly form a U-shaped temperature control cavity, and the inner wall of the metal lining shell is fixedly connected with a sewage concentration increasing mechanism. By optimizing the structure and realizing miniaturization, the anaerobic tank disclosed by the invention can meet the requirements of small enterprises on low-cost anaerobic sewage treatment, has the functions of sewage high-temperature sterilization, sewage temperature pretreatment and sewage concentration increase, optimizes the microbial environment in sewage anaerobic treatment, and has the advantages of simple operation, low cost and high efficiency. And the anaerobic tank also has a temperature regulation and control function, so that the sewage anaerobic treatment efficiency and convenience are effectively improved.

Description

Technical Field

[0001] The invention belongs to the technical field of sewage treatment, and in particular relates to an anaerobic tank for sewage treatment. Background Art

[0002] The anaerobic tank is a core structure in the sewage treatment system that utilizes the metabolism of anaerobic microorganisms (such as methanogens and acidogens) to degrade organic matter. Its operating environment is completely isolated from oxygen. Through the anaerobic digestion process of microorganisms, the macromolecular organic matter in the sewage is decomposed into methane, carbon dioxide, water and other products, while reducing the COD (chemical oxygen demand) and BOD (biochemical oxygen demand) of the sewage. The anaerobic tank has the advantages of low energy consumption, low sludge production, and recyclable bioenergy (biogas). It is suitable for the treatment of high-concentration organic sewage. For example, the patent with authorization announcement number CN209338212U discloses an anaerobic tank.

[0003] At present, in the food processing, brewing, breeding, slaughtering and other industries, some small enterprises will produce high-concentration organic wastewater, which needs to be treated anaerobicly to achieve standard discharge or resource utilization. However, the high construction cost, high operation cost and high site requirements of traditional large-scale sewage treatment facilities and anaerobic tanks make it difficult to adapt to the actual needs of small enterprises. In addition, when the existing anaerobic tanks are in use, the water content in the sewage is relatively large and the organic impurities are relatively dispersed, resulting in insufficient contact between the organic impurities and microorganisms, affecting the convenience and efficiency of anaerobic sewage treatment. Moreover, the water content of the sewage is too high, which causes the water temperature of the sewage to rise slowly after entering the anaerobic tank. As a result, the sewage temperature in the initial treatment stage cannot quickly reach the temperature conditions required for the high metabolic activity of anaerobic microorganisms, which in turn leads to insufficient efficiency in the initial stage of anaerobic sewage treatment, further affecting the convenience and efficiency of anaerobic tank sewage treatment.

[0004] To this end, we propose an anaerobic tank based on sewage treatment to solve the above problems. Summary of the invention

[0005] The purpose of the present invention is to provide an anaerobic tank for sewage treatment in view of the above problems.

[0006] To achieve the above-mentioned purpose, the present invention adopts the following technical solutions: an anaerobic tank for sewage treatment, comprising an insulated anaerobic tank, the inner wall of which is fixedly embedded with a metal lining shell, the bottom end of which is filled with a biological filler layer, the inner wall of which and the outer wall of which together form a U-shaped temperature control chamber, the inner wall of which is fixedly connected with a sewage concentration increasing mechanism; The outer wall of the top end of the heat-insulating anaerobic pond is connected with a pond cover through bolts. A sealing ring is fixedly connected to the inner wall of the pond cover. Through holes are formed in the upper surface of the sealing ring, and a first sealing bearing is fixedly connected to the hole wall of the through holes. A driving mechanism is fixedly connected to the inner wall of the inner ring of the first sealing bearing; A sewage pretreatment mechanism is fixedly connected to the upper surface of the heat-insulating anaerobic pond; Through holes are formed in the upper surface of the pond cover, and a first temperature sensor is fixedly connected to the hole wall of the through holes. Through holes are formed in the upper surface of the heat-insulating anaerobic pond, and a one-way exhaust valve is fixedly connected to the hole wall of the through holes. The air outlet end of the one-way exhaust valve is fixedly communicated with a recovery pipe.

[0007] In the above-mentioned anaerobic pond for sewage treatment, the sewage concentration increasing mechanism includes a ceramic filter plate fixedly connected to the inner wall of the metal inner liner housing. Through holes are formed in the upper surface of the ceramic filter plate, and a second sealing bearing is fixedly connected to the hole wall of the through holes. A stirrer is fixedly connected to the inner wall of the inner ring of the second sealing bearing. A driving groove block is fixedly connected to the top end of the stirrer. Circular holes are formed at the edge of the upper surface of the ceramic filter plate, and a discharge pipe is fixedly connected to the hole wall of the circular holes. The top end of the discharge pipe passes through the outer walls of the metal inner liner housing and the heat-insulating anaerobic pond, and is fixedly communicated with a sewage pumping and suction pump. A strengthening mesh plate is fixedly connected to the lower surface of the ceramic filter plate. The side wall of the strengthening mesh plate is fixedly connected to the inner wall of the metal inner liner housing. An inlet one-way valve is fixedly communicated with the pipe wall of the discharge pipe at the upper surface of the ceramic filter plate.

[0008] In the above-mentioned anaerobic pond for sewage treatment, a filter mesh cover is fixedly sleeved on the bottom end of the discharge pipe. Two wire brushes are fixedly connected to the top end of the stirrer, and the bristles of the wire brushes are in contact with the bottom end of the strengthening mesh plate.

[0009] In the above-mentioned anaerobic pond for sewage treatment, the driving mechanism includes a rotating rod fixedly connected to the inner wall of the inner ring of the first sealing bearing. A driving block is fixedly connected to the bottom end of the rotating rod and is in plug-in fit with the driving groove block. An L-shaped frame is fixedly connected to the upper surface of the heat-insulating anaerobic pond through bolts. A driving motor is fixedly connected to the upper surface of the L-shaped frame. The output end of the driving motor passes through the inner wall of the L-shaped frame and is fixedly connected to the top end of the rotating rod. An air suction volute is sleeved on the rod wall of the rotating rod. The upper surface of the air suction volute is fixedly connected to the lower surface of the L-shaped frame. An air suction impeller is fixedly sleeved on the rod wall of the rotating rod inside the air suction volute. A liquid level sensor is fixedly connected to the inner wall of the top end of the heat-insulating anaerobic pond.

[0010] In the above-mentioned anaerobic pond for sewage treatment, a protective mesh plate for protecting the first temperature sensor is fixedly sleeved on the rod wall of the rotating rod.

[0011] In the above-mentioned anaerobic tank for sewage treatment, the sewage pretreatment mechanism includes a heat-insulating cylinder fixedly connected to the upper surface of the heat-insulating anaerobic tank. A partition plate is fixedly connected to the inner wall of the heat-insulating cylinder. An installation hole is formed in the upper surface of the partition plate, and a heating metal coil is fixedly connected to the hole wall of the installation hole. The top end of the heating metal coil is fixedly connected to an electromagnetic butterfly valve. The inlet of the electromagnetic butterfly valve passes through the outer wall of the heat-insulating cylinder. The bottom end of the heating metal coil is fixedly connected to a cooling metal coil. The bottom end of the cooling metal coil sequentially passes through the inner wall of the heat-insulating anaerobic tank and the lower surface of the ceramic filter plate, and extends downward to the bottom end of the metal inner lining shell. The air outlet end of the air suction volute is fixedly communicated with a three-way pipe. The two air outlet ends of the three-way pipe both pass through the branch pipes. The air outlet ends of the two branch pipes are respectively fixedly communicated with the outer walls of the top end and the bottom end of the heat-insulating cylinder. The outer walls of the top end and the bottom end of the heat-insulating cylinder are respectively fixedly communicated with a first exhaust pipe and a second exhaust pipe. The pipe walls of the first exhaust pipe and the second exhaust pipe are jointly fixedly communicated with a combined pipe. The bottom end of the combined pipe passes through the top outer wall of the heat-insulating anaerobic tank and is fixedly communicated with a U-shaped temperature control cavity. A second temperature sensor is fixedly communicated with the bottom end pipe wall of the combined pipe. The air outlet end of the first exhaust pipe is fixedly communicated with a first regulating electric valve. The air outlet end of the second exhaust pipe is fixedly communicated with a second regulating electric valve. An electric heating tube is fixedly embedded in the top end of the heat-insulating cylinder. The top end of the U-shaped temperature control cavity is fixedly communicated with an exhaust elbow.

[0012] In the above-mentioned anaerobic tank for sewage treatment, the partition plate divides the inner cavity of the heat-insulating cylinder into a heating and inactivating area and a cooling area. The air outlet ends of the two branch pipes are respectively communicated with the heating and inactivating area and the cooling area. The air inlet end of the first exhaust pipe is communicated with the heating and inactivating area. The air inlet end of the second exhaust pipe is communicated with the cooling area.

[0013] In the above-mentioned anaerobic tank for sewage treatment, a PLC controller is fixedly connected to the inner wall of the L-shaped frame. The outer wall of the top end of the L-shaped frame is fixedly connected to the outer wall of the heat-insulating cylinder by bolts.

[0014] Compared with the existing technology, the advantages of an anaerobic tank for sewage treatment are as follows: 1. Through the provided biological filler layer, driving mechanism, and sewage pretreatment mechanism, when anaerobic treatment of sewage is required, first, the sewage is transported to the heating metal coil through the electromagnetic butterfly valve. Moreover, the PLC controller controls the driving motor and the electric heating tube to start. The driving mechanism delivers air to the heating inactivation area and the cooling area. The high temperature generated by the heating of the electric heating tube can inactivate microorganisms in the sewage within the heating metal coil, preventing some microorganisms in the sewage from having an adverse impact on the biological activity of the anaerobic microorganisms in the biological filler layer. Then, the sewage treated at high temperature flows into the cooling metal coil and is cooled by the flowing air in the cooling area, preventing the sewage temperature from being too high to kill the anaerobic microorganisms in the biological filler layer. And the temperature of the sewage flowing into the heat-insulated anaerobic tank is maintained within the temperature range required by the anaerobic microorganisms. The sewage within this temperature range can promote the metabolic activities and reproduction of the anaerobic microorganisms in the biological filler layer, accelerating the speed at which the anaerobic microorganisms treat the organic matter in the sewage, and preventing the sewage treatment efficiency from being low due to the influence of low-temperature sewage at the initial stage of anaerobic sewage treatment. This mechanism enables the anaerobic tank to have the functions of high-temperature sterilization of sewage and temperature pretreatment of sewage, optimizing the microbial environment in anaerobic sewage treatment, thereby improving the efficiency and convenience of anaerobic sewage treatment.

[0015] 2. Through the provided sewage concentration enhancement mechanism, when the sewage is injected into the bottom of the heat-insulated anaerobic tank along the cooling metal coil, as the injection volume of the sewage increases, the sewage comes into contact with the ceramic filter plate. At this time, the ceramic filter plate can filter the sewage. The water in the sewage passes through the ceramic filter plate and enters the top position of the heat-insulated anaerobic tank, while the impurities in the sewage are intercepted by the ceramic filter plate at the bottom of the heat-insulated anaerobic tank, increasing the concentration of the sewage at the bottom of the heat-insulated anaerobic tank and preventing the situation where the organic impurities are dispersed due to a large water content in the sewage. This improves the contact rate between the organic impurities and the anaerobic microorganisms in the biological filler layer, and further enables the organic impurities in the sewage to be efficiently treated by the anaerobic microorganisms in the biological filler layer. This mechanism enables the anaerobic tank to have the function of enhancing the sewage concentration, preventing the impurities in the sewage from being too dispersed and inconvenient for anaerobic microorganism treatment, thereby improving the convenience and efficiency of anaerobic sewage treatment.

[0016] 3. With the sewage pretreatment mechanism and the first temperature sensor set, when the sewage is anaerobically treated inside the heat-insulated anaerobic tank, the first temperature sensor detects the temperature inside the heat-insulated anaerobic tank. Especially when the temperature inside the heat-insulated anaerobic tank fails to reach the required temperature range for anaerobic microorganisms due to the outdoor temperature in winter or summer, the opening degrees of the first regulating electric valve and the second regulating electric valve are adjusted through the first temperature sensor and the PLC controller. Moreover, the second temperature sensor also detects the temperature at the output end of the combined pipe, and the PLC controller further corrects the opening degrees of the first regulating electric valve and the second regulating electric valve according to the electrical signal of the second temperature sensor to ensure that the air temperature input into the U-shaped temperature control cavity conforms to the temperature range required for the high metabolic activity of anaerobic microorganisms. In addition, the anaerobic treatment environmental temperature inside the heat-insulated anaerobic tank can be actively set through the PLC controller according to the types of anaerobic microorganisms and the specific temperature required for anaerobic treatment. This mechanism enables the anaerobic tank to also have the function of temperature regulation, effectively improving the resistance of the anaerobic tank to the interference of the external environmental temperature and effectively ensuring the efficiency and convenience of sewage anaerobic treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic structural diagram of an anaerobic tank for sewage treatment provided by the present invention; Figure 2 is Figure 1 a schematic sectional view; Figure 3 is a schematic structural diagram of a ceramic filter plate part in an anaerobic tank for sewage treatment provided by the present invention; Figure 4 is a schematic structural diagram of a sewage pretreatment mechanism part in an anaerobic tank for sewage treatment provided by the present invention; Figure 5 is a schematic enlarged partial structural diagram of a driving mechanism in an anaerobic tank for sewage treatment provided by the present invention; Figure 6 is a schematic structural diagram of a tank cover part in an anaerobic tank for sewage treatment provided by the present invention.

[0018] In the figure: 1 heat-insulating anaerobic tank, 2 metal inner-lining shell, 3 biological filler layer, 4 U-shaped temperature control cavity, 5 sewage concentration boosting mechanism, 51 ceramic filter plate, 52 agitator, 53 drive groove block, 54 discharge pipe, 55 sewage suction pump, 56 reinforcing mesh plate, 57 inlet check valve, 58 second sealing bearing, 6 drive mechanism, 61 rotating rod, 62 drive block, 63 L-shaped frame, 64 drive motor, 65 air suction volute, 66 air suction impeller, 67 liquid level sensor, 7 sewage pretreatment mechanism, 71 heat-insulating cylinder, 72 partition plate, 73 heating metal coil, 74 cooling metal coil, 75 three-way pipe, 76 branch pipe, 77 first exhaust pipe, 78 second exhaust pipe, 79 combined pipe, 710 second temperature sensor, 711 first regulating electric valve, 712 second regulating electric valve, 713 electric heating pipe, 714 exhaust elbow, 715 electromagnetic butterfly valve, 8 heating and inactivating area, 9 cooling area, 10 tank cover, 11 sealing ring, 12 first sealing bearing, 13 first temperature sensor, 14 one-way exhaust valve, 15 recovery pipe, 16 filter mesh cover, 17 steel wire brush, 18 protective mesh plate, 19 PLC controller. Detailed implementation manners

[0019] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0020] As Figures 1 - 6As shown in the figure, an anaerobic pond for sewage treatment includes a heat-insulated anaerobic pond 1. A metal inner-lined housing 2 is fixedly embedded in the inner wall of the heat-insulated anaerobic pond 1. A biological filler layer 3 is filled at the bottom end of the metal inner-lined housing 2. The inner wall of the heat-insulated anaerobic pond 1 and the outer wall of the metal inner-lined housing 2 together form a U-shaped temperature control cavity 4. A sewage concentration boosting mechanism 5 is fixedly connected to the inner wall of the metal inner-lined housing 2. The sewage concentration boosting mechanism 5 includes a ceramic filter plate 51 fixedly connected to the inner wall of the metal inner-lined housing 2. Through holes are formed in the upper surface of the ceramic filter plate 51, and a second sealing bearing 58 is fixedly connected to the hole wall of the through hole. A stirrer 52 is fixedly connected to the inner wall of the inner ring of the second sealing bearing 58. A driving groove block 53 is fixedly connected to the top end of the stirrer 52. A round hole is formed at the edge of the upper surface of the ceramic filter plate 51, and a discharge pipe 54 is fixedly connected to the hole wall of the round hole. The top end of the discharge pipe 54 passes through the outer walls of the metal inner-lined housing 2 and the heat-insulated anaerobic pond 1 and is fixedly communicated with a sewage suction pump 55. A reinforcing mesh plate 56 is fixedly connected to the lower surface of the ceramic filter plate 51. The side wall of the reinforcing mesh plate 56 is fixedly connected to the inner wall of the metal inner-lined housing 2. The reinforcing mesh plate 56 can improve the structural strength of the ceramic filter plate 51 and prevent the ceramic filter plate 51 from being damaged by water pressure. The aperture of the reinforcing mesh plate 56 is relatively large and will not interfere with the filtration of the ceramic filter plate 51. A water inlet check valve 57 is fixedly communicated with the pipe wall of the discharge pipe 54 at the upper surface of the ceramic filter plate 51. A filter mesh cover 16 is fixedly sleeved at the bottom end of the discharge pipe 54. Two wire brushes 17 are fixedly connected to the top end of the stirrer 52. The bristles of the wire brushes 17 are in contact with the bottom end of the reinforcing mesh plate 56. This mechanism enables the anaerobic pond to have the function of boosting the sewage concentration, avoids the excessive dispersion of impurities in the sewage, which is inconvenient for anaerobic microorganisms to treat, and thus improves the convenience and efficiency of sewage anaerobic treatment.

[0021] A pool cover 10 is connected to the outer wall of the top end of the heat-insulated anaerobic pond 1 through bolts. A sealing ring 11 is fixedly connected to the inner wall of the pool cover 10. Through holes are formed in the upper surface of the sealing ring 11, and a first sealing bearing 12 is fixedly connected to the hole wall of the through hole. A driving mechanism 6 is fixedly connected to the inner wall of the inner ring of the first sealing bearing 12. The driving mechanism 6 includes a rotating rod 61 fixedly connected to the inner wall of the inner ring of the first sealing bearing 12. A driving block 62 that is inserted and matched with the driving groove block 53 is fixedly connected to the bottom end of the rotating rod 61. An L-shaped frame 63 is fixedly connected to the upper surface of the heat-insulated anaerobic pond 1 through bolts. A driving motor 64 is fixedly connected to the upper surface of the L-shaped frame 63. The output end of the driving motor 64 passes through the inner wall of the L-shaped frame 63 and is fixedly connected to the top end of the rotating rod 61. An air suction volute 65 is sleeved on the rod wall of the rotating rod 61. The upper surface of the air suction volute 65 is fixedly connected to the lower surface of the L-shaped frame 63. An air suction impeller 66 is fixedly sleeved on the rod wall of the rotating rod 61 inside the air suction volute 65. A liquid level sensor 67 is fixedly connected to the inner wall of the top end of the heat-insulated anaerobic pond 1.

[0022] A protective mesh plate 18 for protecting the first temperature sensor 13 is fixedly sleeved on the rod wall of the rotating rod 61. The protective mesh plate 18 can prevent water from adhering to the detection end of the first temperature sensor 13 and interfering with the detection accuracy as the rotating rod 61 rotates.

[0023] The upper surface of the heat-insulating anaerobic tank 1 is fixedly connected with a sewage pretreatment mechanism 7, and the sewage pretreatment mechanism 7 includes a heat-insulating cylinder 71 fixedly connected with the upper surface of the heat-insulating anaerobic tank 1, and the inner wall of the heat-insulating cylinder 71 is fixedly connected with a partition plate 72, and the upper surface of the partition plate 72 is provided with a mounting hole, and the hole wall of the mounting hole is fixedly connected with a heating metal coil 73, and the top of the heating metal coil 73 is fixedly connected with an electromagnetic butterfly valve 715, and the inlet of the electromagnetic butterfly valve 715 passes through the outer wall of the heat-insulating cylinder 71, and the bottom end of the heating metal coil 73 is fixedly connected with a cooling metal coil 7 4. The bottom end of the cooling metal coil 74 passes through the inner wall of the heat-insulating anaerobic tank 1 and the lower surface of the ceramic filter plate 51 in sequence, and extends downward to the bottom end of the metal lined shell 2. The air outlet end of the air suction volute 65 is fixedly connected with a three-way pipe 75. Both air outlet ends of the three-way pipe 75 pass through the branch pipe 76. The air outlet ends of the two branch pipes 76 are fixedly connected with the outer walls of the top and bottom ends of the heat-insulating cylinder 71, respectively. The outer walls of the top and bottom ends of the heat-insulating cylinder 71 are fixedly connected with the first exhaust pipe 77 and the second exhaust pipe 78, respectively. The pipe walls are fixedly connected with a combined pipe 79, the bottom end of the combined pipe 79 passes through the top outer wall of the heat-insulating anaerobic tank 1 and is fixedly connected with the U-shaped temperature control chamber 4, the bottom end of the combined pipe 79 is fixedly connected with a second temperature sensor 710, the outlet end of the first exhaust pipe 77 is fixedly connected with a first regulating electric valve 711, the outlet end of the second exhaust pipe 78 is fixedly connected with a second regulating electric valve 712, the top of the heat-insulating cylinder 71 is fixedly embedded with an electric heating pipe 713, the top of the U-shaped temperature control chamber 4 is fixedly connected with an exhaust elbow 714, and the partition plate 72 is used to separate the insulation tube 71 from the heat-insulating cylinder 71. The internal cavity of the heat cylinder 71 is divided into a heating and inactivation zone 8 and a cooling zone 9. The air outlet ends of the two branch pipes 76 are connected to the heating and inactivation zone 8 and the cooling zone 9 respectively. The air inlet end of the first exhaust pipe 77 is connected to the heating and inactivation zone 8, and the air inlet end of the second exhaust pipe 78 is connected to the cooling zone 9. This mechanism enables the anaerobic tank to have the functions of high-temperature sterilization of sewage and temperature pretreatment of sewage, optimizes the microbial environment in anaerobic treatment of sewage, and also has the function of temperature regulation, effectively improves the anaerobic tank's resistance to interference from the external environmental temperature, and improves the efficiency and convenience of anaerobic treatment of sewage.

[0024] The upper surface of the pool cover 10 is provided with a through hole, and the hole wall of the through hole is fixedly connected with a first temperature sensor 13. The upper surface of the heat-insulated anaerobic pool 1 is provided with a through hole, and the hole wall of the through hole is fixedly connected with a one-way exhaust valve 14. The air outlet end of the one-way exhaust valve 14 is fixedly communicated with a recovery pipe 15. The inner wall of the L-shaped frame 63 is fixedly connected with a PLC controller 19. The outer wall of the top end of the L-shaped frame 63 is fixedly connected with the outer wall of the heat-insulated cylinder 71 through bolts. The automatic control by the PLC controller 19 can improve the convenience of using the anaerobic pool.

[0025] The sewage suction pump 55, the drive motor 64, the first regulating electric valve 711, the second regulating electric valve 712, the electric heating pipe 713 and the electromagnetic butterfly valve 715 are all electrically connected to the output end of the PLC controller 19 through wires. The liquid level sensor 67, the second temperature sensor 710 and the first temperature sensor 13 are all electrically connected to the input end of the PLC controller 19 through wires. The above-mentioned energized components and electrical connections are all prior arts and will not be elaborated here.

[0026] Now, the operation principle of the present invention is described as follows: When the sewage needs to be anaerobically treated, first, the sewage pipeline is connected to the inlet of the electromagnetic butterfly valve 715, and the sewage is transported to the heating metal coil 73 through the opened electromagnetic butterfly valve 715. At this time, the PLC controller 19 controls the drive motor 64 and the electric heating pipe 713 to start. The electric heating pipe 713 generates heat to raise the temperature of the heating and inactivation area 8. The PLC controller 19 controls the heating power of the electric heating pipe 713 so that the temperature of the heating and inactivation area 8 is controlled within the range of 140°C - 150°C. Due to the influence of the length of the heating metal coil 73, the sewage can flow inside the heating metal coil 73 for 1 - 1.5 minutes. And within this 1 - 1.5 minutes, the sewage is heated by the heat exchange of the heating and inactivation area 8 and the temperature of the sewage can be raised to above 85°C. Then, the microorganisms in the sewage are inactivated at high temperature, avoiding the adverse effects of some microorganisms in the sewage on the biological activity of the anaerobic microorganisms in the biological filler layer 3. Then, the sewage treated at high temperature flows into the cooling metal coil 74. Similarly, due to the length of the cooling metal coil 74, the sewage can also flow in the cooling metal coil 74 for 1 - 1.5 minutes. At the same time, the driving motor 64 drives the rotating rod 61 to rotate, the rotating rod 61 drives the air suction impeller 66 to rotate, and the air suction impeller 66 cooperates with the air suction volute 65 to suck in external air and transport it to the tee 75. Then, the air in the tee 75 is respectively transported to the heating and inactivation zone 8 and the cooling zone 9 of the heat insulation cylinder 71 through two branch pipes 76. In the cooling zone 9, when the air flows through the surface of the cooling metal coil 74, it can effectively reduce the temperature of the high-temperature sewage inside the cooling metal coil 74, prevent the sewage temperature from being too high to kill the anaerobic microorganisms in the biological packing layer 3, and keep the temperature of the sewage flowing into the heat insulation anaerobic tank 1 within the temperature range required by the anaerobic microorganisms (such as 30°C - 40°C). The sewage within this temperature range can promote the metabolic activities and reproduction of the anaerobic microorganisms in the biological packing layer 3, accelerate the speed of the anaerobic microorganisms in treating the organic matter in the sewage, and prevent the sewage anaerobic treatment efficiency from being low due to the influence of low-temperature sewage at the initial stage of anaerobic treatment. Moreover, the driving motor 64 makes the stirrer 52 rotate through the rotating rod 61, the driving block 62, and the driving groove block 53. During the rotation of the stirrer 52, it can drive the microorganisms in the biological packing layer 3 to fully contact the organic matter in the sewage, further accelerating the speed of sewage anaerobic treatment. This mechanism enables the anaerobic tank to have the functions of high-temperature sterilization of sewage and pre-treatment of sewage temperature, optimizes the microbial environment in sewage anaerobic treatment, can not only avoid the interference of anaerobic microorganisms by other microorganisms, but also control the sewage temperature to increase the treatment speed at the initial stage of anaerobic treatment, thereby improving the efficiency and convenience of sewage anaerobic treatment; When the sewage is injected into the bottom of the heat-insulated anaerobic tank 1 along the cooling metal coiled pipe 74, as the injection volume of the sewage increases, the sewage contacts the ceramic filter plate 51. At this time, the ceramic filter plate 51 can filter and treat the sewage. The water liquid in the sewage passes through the ceramic filter plate 51 and enters the top position of the heat-insulated anaerobic tank 1. As the injection volume of the sewage increases, the liquid level at the top of the ceramic filter plate 51 gradually rises along the inner wall of the heat-insulated anaerobic tank 1. And when the liquid level rises to the liquid level sensor 67, the liquid level sensor 67 sends a liquid level electrical signal to the PLC controller 19. The PLC controller 19 controls the electromagnetic butterfly valve 715 to close through the received liquid level electrical signal, pauses the sewage transportation, ensures that the heat-insulated anaerobic tank 1 is in an isolated state and reaches an anaerobic environment. Moreover, the impurities in the sewage are intercepted by the ceramic filter plate 51 at the bottom of the heat-insulated anaerobic tank 1, increasing the sewage concentration at the bottom of the heat-insulated anaerobic tank 1, avoiding the situation where the organic impurities are relatively dispersed due to the large water content in the sewage, improving the contact rate between the organic impurities and the anaerobic microorganisms in the biological packing layer 3. Then, the organic impurities in the sewage are efficiently treated by the anaerobic microorganisms in the biological packing layer 3. During the anaerobic treatment process, the excess gas generated anaerobically inside the heat-insulated anaerobic tank 1 is recovered through the one-way exhaust valve 14 and the recovery pipe 15. This not only enables the utilization of the gas generated by anaerobic treatment but also maintains the air pressure balance inside the heat-insulated anaerobic tank 1, ensuring the normal metabolic activities of anaerobic microorganisms. In addition, the stirrer 52 is driven to rotate by the rotating rod 61 and the driving motor 64. The stirrer 52 drives the steel wire brush 17 to rotate, and the steel wire brush 17 can clean the impurities at the bottom of the strengthening mesh plate 56 and the ceramic filter plate 51, preventing the ceramic filter plate 51 from being blocked by impurities. After the anaerobic treatment of the sewage, the PLC controller 19 controls the sewage discharge suction pump 55 to start. The sewage discharge suction pump 55 sucks the anaerobically treated sewage at the bottom of the heat-insulated anaerobic tank 1 through the discharge pipe 54. The filter net cover 16 prevents the biological packing layer 3 from being sucked out. Moreover, the water liquid at the top of the heat-insulated anaerobic tank 1 enters the inside of the discharge pipe 54 through the inlet one-way valve 57. Finally, the sewage discharge suction pump 55 transports the anaerobically treated sewage to the next treatment process through the pipeline. This mechanism enables the anaerobic tank to have the function of increasing the sewage concentration, avoiding the situation where the impurities in the sewage are too dispersed and inconvenient for anaerobic microorganism treatment, thereby improving the convenience and efficiency of sewage anaerobic treatment; When the sewage is anaerobically treated inside the heat-insulated anaerobic tank 1, the first temperature sensor 13 detects the temperature inside the heat-insulated anaerobic tank 1. Especially when the outdoor temperature in winter or summer causes the temperature inside the heat-insulated anaerobic tank 1 to not reach the required temperature range for anaerobic microorganisms (such as 30°C - 40°C), at this time, the first temperature sensor 13 sends an electrical signal to the PLC controller 19, and the PLC controller 19 controls the opening degrees of the first regulating electric valve 711 and the second regulating electric valve 712. For example, in a low-temperature outdoor environment in winter, the opening degree of the first regulating electric valve 711 is adjusted smaller. Affected by the reduced opening degree of the first regulating electric valve 711, the exhaust resistance at the outlet end of the first exhaust pipe 77 increases, and thus the amount of hot air entering the combined pipe 79 increases. The opening degree of the second regulating electric valve 712 is adjusted larger. Affected by the increased opening degree of the second regulating electric valve 712, the exhaust resistance at the outlet end of the second exhaust pipe 78 decreases, and thus the amount of low-temperature air entering the combined pipe 79 decreases. In a high-temperature outdoor environment in summer, the opening degree of the first regulating electric valve 711 is adjusted larger, even to the maximum, so that all the hot air inside the first exhaust pipe 77 is discharged from the outlet end of the first regulating electric valve 711. The opening degree of the second regulating electric valve 712 is adjusted larger, so that the amount of low-temperature air entering the combined pipe 79 increases; And the second temperature sensor 710 also detects the temperature at the output end of the combined pipe 79. The temperature value detected by the second temperature sensor 710 is converted into an electrical signal and sent to the PLC controller 19. The PLC controller 19 further corrects the opening degrees of the first regulating electric valve 711 and the second regulating electric valve 712 according to the electrical signal of the second temperature sensor 710 to ensure that the air temperature input into the U-shaped temperature control chamber 4 meets the required range for anaerobic microorganisms (such as 30°C - 40°C), so that the temperature inside the heat-insulated anaerobic tank 1 always meets the temperature range required for the high metabolic activities of anaerobic microorganisms. In addition, the temperature of the anaerobic treatment environment inside the heat-insulated anaerobic tank 1 can be actively set through the PLC controller 19 according to the types of anaerobic microorganisms and the specific temperature required for anaerobic treatment. Finally, the air inside the U-shaped temperature control chamber 4 is discharged through the exhaust elbow 714. This mechanism enables the anaerobic tank to also have the function of temperature regulation, effectively improving the resistance of the anaerobic tank to the interference of the external environmental temperature and effectively ensuring the efficiency and convenience of sewage anaerobic treatment.

[0027] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An anaerobic tank for sewage treatment, including a heat-insulated anaerobic tank (1), characterized in that, The inner wall of the heat-insulated anaerobic tank (1) is fixedly embedded with a metal inner lining shell (2). The bottom end of the metal inner lining shell (2) is filled with a biological filler layer (3). The inner wall of the heat-insulated anaerobic tank (1) and the outer wall of the metal inner lining shell (2) together form a U-shaped temperature control cavity (4). The inner wall of the metal inner lining shell (2) is fixedly connected with a sewage concentration boosting mechanism (5). The outer wall of the top end of the heat-insulated anaerobic tank (1) is bolted with a tank cover (10). The inner wall of the tank cover (10) is fixedly connected with a sealing ring (11). The upper surface of the sealing ring (11) is provided with a through hole, and the hole wall of the through hole is fixedly connected with a first sealing bearing (12). The inner ring inner wall of the first sealing bearing (12) is fixedly connected with a driving mechanism (6). The upper surface of the heat-insulated anaerobic tank (1) is fixedly connected with a sewage pretreatment mechanism (7). The upper surface of the tank cover (10) is provided with a through hole, and the hole wall of the through hole is fixedly connected with a first temperature sensor (13). The upper surface of the heat-insulated anaerobic tank (1) is provided with a through hole, and the hole wall of the through hole is fixedly connected with a one-way exhaust valve (14). The air outlet end of the one-way exhaust valve (14) is fixedly communicated with a recovery pipe (15).

2. The anaerobic tank for sewage treatment according to claim 1, characterized in that, The sewage concentration boosting mechanism (5) includes a ceramic filter plate (51) fixedly connected with the inner wall of the metal inner lining shell (2). The upper surface of the ceramic filter plate (51) is provided with a through hole, and the hole wall of the through hole is fixedly connected with a second sealing bearing (58). The inner ring inner wall of the second sealing bearing (58) is fixedly connected with a stirrer (52). The top end of the stirrer (52) is fixedly connected with a driving groove block (53). The edge of the upper surface of the ceramic filter plate (51) is provided with a round hole, and the hole wall of the round hole is fixedly connected with a discharge pipe (54). The top end of the discharge pipe (54) passes through the outer walls of the metal inner lining shell (2) and the heat-insulated anaerobic tank (1) and is fixedly communicated with a sewage suction pump (55). The lower surface of the ceramic filter plate (51) is fixedly connected with a reinforcing mesh plate (56). The side wall of the reinforcing mesh plate (56) is fixedly connected with the inner wall of the metal inner lining shell (2). The pipe wall of the discharge pipe (54) at the upper surface of the ceramic filter plate (51) is fixedly communicated with an inlet check valve (57).

3. An anaerobic pond for sewage treatment according to claim 2, characterized in that, The bottom end of the discharge pipe (54) is fixedly sleeved with a filter mesh cover (16). The top end of the stirrer (52) is fixedly connected with two wire brushes (17). The bristles side of the wire brushes (17) contacts the bottom end of the reinforcing mesh plate (56).

4. An anaerobic tank for sewage treatment according to claim 2, characterized in that, The driving mechanism (6) includes a rotating rod (61) fixedly connected to the inner wall of the inner ring of the first sealed bearing (12). The bottom end of the rotating rod (61) is fixedly connected to a driving block (62) that is inserted and matched with the driving groove block (53). The upper surface of the heat-insulated anaerobic pond (1) is fixedly connected with an L-shaped frame (63) by bolts. The upper surface of the L-shaped frame (63) is fixedly connected with a driving motor (64). The output end of the driving motor (64) passes through the inner wall of the L-shaped frame (63) and is fixedly connected to the top end of the rotating rod (61). A suction air volute (65) is sleeved on the rod wall of the rotating rod (61). The upper surface of the suction air volute (65) is fixedly connected with the lower surface of the L-shaped frame (63). A suction air impeller (66) is fixedly sleeved on the rod wall of the rotating rod (61) inside the suction air volute (65). The top inner wall of the heat-insulated anaerobic pond (1) is fixedly connected with a liquid level sensor (67).

5. The anaerobic pond for sewage treatment according to claim 4, characterized in that, A protective net plate (18) for protecting the first temperature sensor (13) is fixedly sleeved on the rod wall of the rotating rod (61).

6. The anaerobic pond for sewage treatment according to claim 4, characterized in that, The sewage pretreatment mechanism (7) includes a heat-insulated cylinder (71) fixedly connected to the upper surface of the heat-insulated anaerobic pond (1). A partition plate (72) is fixedly connected to the inner wall of the heat-insulated cylinder (71). An installation hole is opened on the upper surface of the partition plate (72), and a heating metal coil pipe (73) is fixedly connected to the hole wall of the installation hole. The top end of the heating metal coil pipe (73) is fixedly connected with an electromagnetic butterfly valve (715). The inlet of the electromagnetic butterfly valve (715) passes through the outer wall of the heat-insulated cylinder (71). The bottom end of the heating metal coil pipe (73) is fixedly connected with a cooling metal coil pipe (74). The bottom end of the cooling metal coil pipe (74) sequentially passes through the inner wall of the heat-insulated anaerobic pond (1) and the lower surface of the ceramic filter plate (51), and extends downward to the bottom end of the metal inner lining shell (2). The air outlet end of the suction air volute (65) is fixedly communicated with a three-way pipe (75). The two air outlet ends of the three-way pipe (75) both pass through the branch pipes (76). The air outlet ends of the two branch pipes (76) are respectively fixedly communicated with the outer walls of the top end and the bottom end of the heat-insulated cylinder (71). The outer walls of the top end and the bottom end of the heat-insulated cylinder (71) are respectively fixedly communicated with a first exhaust pipe (77) and a second exhaust pipe (78). A combined pipe (79) is fixedly communicated with the pipe walls of the first exhaust pipe (77) and the second exhaust pipe (78). The bottom end of the combined pipe (79) passes through the outer wall of the top end of the heat-insulated anaerobic pond (1) and is fixedly communicated with the U-shaped temperature control cavity (4). A second temperature sensor (710) is fixedly communicated with the bottom end pipe wall of the combined pipe (79). The air outlet end of the first exhaust pipe (77) is fixedly communicated with a first regulating electric valve (711). The air outlet end of the second exhaust pipe (78) is fixedly communicated with a second regulating electric valve (712). An electric heating pipe (713) is fixedly embedded in the top end of the heat-insulated cylinder (71). The top end of the U-shaped temperature control cavity (4) is fixedly communicated with an exhaust elbow (714).

7. An anaerobic pond for sewage treatment according to claim 6, characterized in that, The partition plate (72) divides the inner cavity of the heat insulation cylinder (71) into a heating and inactivating area (8) and a cooling area (9). The air outlet ends of the two branch pipes (76) are respectively communicated with the heating and inactivating area (8) and the cooling area (9). The air inlet end of the first exhaust pipe (77) is communicated with the heating and inactivating area (8), and the air inlet end of the second exhaust pipe (78) is communicated with the cooling area (9).

8. An anaerobic pond for sewage treatment according to claim 6, characterized in that, A PLC controller (19) is fixedly connected to the inner wall of the L-shaped frame (63), and the outer wall of the top end of the L-shaped frame (63) is fixedly connected to the outer wall of the heat insulation cylinder (71) through bolts.

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