Carbon emission reduction system for rural domestic sewage

Abstract

The utility model belongs to the technical field of sewage treatment, particularly relates to a carbon emission reduction system for rural domestic sewage, and solves the problems of complex structure, high equipment cost and high electric energy demand. The carbon emission reduction system for rural domestic sewage comprises a filtration and sedimentation tank used for pretreatment, an anaerobic treatment tank, an aerobic treatment tank and an ecological purification tank are sequentially connected to a first water outlet pipe opening of the filtration and sedimentation tank, and a gas outlet pipe connected with an aeration device is led into the tank bottom of the aerobic treatment tank; an air inlet of the aeration device is connected with a selective air inlet pipe, the selective air inlet pipe is used for sucking air from the opening of the ecological purification pond in the daytime and sucking air from the atmosphere outside the ecological purification pond at night, and the aeration device is powered by a photovoltaic power generation assembly and / or a wind power generation assembly. The effects of being simple in structure, low in operation cost, green and energy-saving are achieved.

Description

Technical Field

[0001] This utility model belongs to the field of wastewater treatment technology, and specifically relates to a carbon reduction system for rural domestic wastewater. Background Technology

[0002] Rural domestic sewage mainly refers to wastewater generated by rural residents' daily activities. Unregulated discharge can pollute local water bodies and soil, damage the ecological environment, and seriously affect people's production and lives. With the continuous progress of society, the requirements for low-carbon and green rural domestic sewage treatment are becoming increasingly stringent.

[0003] Currently, some rural domestic sewage treatment systems and methods are quite complex, requiring a lot of electrical equipment, which is costly and has a high demand for electricity. This undoubtedly increases the difficulty and cost of setting up such systems in remote environments lacking supporting power facilities, and is not conducive to achieving the goal of green energy conservation. Utility Model Content

[0004] The purpose of this invention is to address the aforementioned problems in the existing technology by proposing a carbon reduction system for rural domestic sewage.

[0005] To achieve the innovative objectives of this utility model, the following technical solutions can be used:

[0006] A carbon reduction system for rural domestic sewage includes a filtration sedimentation tank for pretreatment. An anaerobic treatment tank, an aerobic treatment tank, and an ecological purification tank are sequentially connected to the first outlet of the filtration sedimentation tank. An air outlet pipe connected to an aeration device is introduced into the bottom of the aerobic treatment tank. A selective air inlet pipe is connected to the air inlet of the aeration device. The selective air inlet pipe is used to draw air from the open end of the ecological purification tank during the day and from the atmosphere outside the ecological purification tank at night. The aeration device is powered by photovoltaic power generation components and / or wind power generation components.

[0007] This invention is used to treat rural domestic sewage. The filtration and sedimentation tank is used for pretreatment of the sewage, including filtration and sedimentation to separate solids of a certain volume—this is existing technology. The pretreated sewage then passes through an anaerobic treatment tank, an aerobic treatment tank, and an ecological purification tank for further treatment. The anaerobic treatment tank mainly removes organic matter, nitrogen, phosphorus, and sulfides from the sewage. The aerobic treatment tank mainly removes organic matter and ammonia nitrogen. The ecological purification tank further removes pollutants from the water through plants and / or microorganisms. The photosynthesis of plants and microorganisms can also fix carbon dioxide, thus reducing carbon emissions. To ensure and even promote the normal operation of the aerobic reaction tank, this system is equipped with an aeration device. This device can transport air with a high oxygen concentration from the ecological treatment tank to the bottom of the aerobic treatment tank during normal photosynthesis. The rising air in the water promotes aerobic reactions. At night, when the plants and microorganisms in the ecological purification tank are only respiring, the carbon dioxide concentration is high. At this time, the aeration device draws air from outside the tank to ensure a high oxygen concentration in the aeration air. Furthermore, the aeration device is powered by photovoltaic and / or wind power generation components, making it environmentally friendly. Overall, the flow of wastewater between the treatment tanks is driven by gravity due to the height difference. Only the aeration device and the related structure of the air inlet pipe require electricity, resulting in low power demand. The corresponding power generation components can provide sufficient power, allowing the system to be installed in environments with inadequate power infrastructure. This results in low operating costs and low carbon emissions. The photovoltaic and wind power generation components are common knowledge and will not be elaborated upon further.

[0008] In the aforementioned carbon reduction system for rural domestic sewage, the selective air intake pipe includes a first air intake pipe with its intake end located inside the ecological purification pool, and a second air intake pipe with its intake end located outside the ecological purification pool. A three-way solenoid valve assembly is provided between the first air intake pipe, the second air intake pipe, and the air inlet.

[0009] The three-way solenoid valve assembly is connected to the first air inlet pipe, the second air inlet pipe, and the air intake end of the aeration device. By controlling the opening and closing of the corresponding channels, it achieves the effect of selecting the air intake environment. The switching action of the three-way solenoid valve assembly can be achieved through sunlight detection signals, time settings, or manual operation. The details of the three-way solenoid valve assembly and its corresponding supporting components and settings are common knowledge and will not be elaborated here.

[0010] In the aforementioned carbon reduction system for rural domestic sewage, the anaerobic treatment tank includes a square first tank body, which is equipped with biofilm packing material. The first tank body has a second inlet pipe and a second outlet pipe on its left and right sides, respectively, and the second outlet pipe is lower than the second inlet pipe.

[0011] The biofilm packing material is specifically used for wastewater treatment. A second inlet and a second outlet are installed on the first tank for wastewater input and output. The two outlets are positioned opposite each other, ensuring that wastewater flow must pass through the biofilm packing material within the tank. This process ensures effective treatment by the biofilm packing material. The second outlet is lower in height, allowing discharge without the need for additional power components. The terms "left and right sides" are used for descriptive purposes and do not represent a specific location.

[0012] In the aforementioned carbon reduction system for rural domestic sewage, several vertically arranged baffles are arranged parallel to each other between the second outlet and the second inlet. The bottom of each baffle is connected to the bottom of the first tank, and the front or rear side is perpendicularly connected to the side wall of the first tank. The other side forms a water passage between the baffle and the side wall of the first tank. The water passages of adjacent baffles are staggered to form an S-shaped water passage that is connected at both ends to the second inlet and the second outlet, respectively. The S-shaped water passage is filled with biofilm packing.

[0013] The baffle plate divides the inner cavity of the second tank into an S-shaped water passage. Wastewater must pass through this passage before it can be discharged, increasing the wastewater's travel distance and ensuring that all wastewater undergoes sufficient effective contact with the biofilm packing material, thus improving the biofilm packing material's ability to retain pollutants. The selection of the biofilm packing material and its treatment principle are common knowledge and will not be elaborated upon.

[0014] In the aforementioned carbon reduction system for rural domestic sewage, the aerobic treatment tank includes a cylindrical second tank body. A material-carrying screw is detachably installed inside the second tank body. A screw loading zone is formed between the material-carrying screw and the side wall of the second tank body. The screw loading zone is filled with aerobic packing material. An aeration zone is formed between the bottom of the material-carrying screw and the bottom of the second tank body. The air outlet pipe is located in the aeration zone. A third water inlet pipe is located above the material-carrying screw and a third water outlet pipe is located below the material-carrying screw on the side wall of the second tank body.

[0015] The inner cavity of the second tank is divided into a spiral loading zone by a material-carrying screw. The wastewater's movement path after input is spiral-shaped, increasing the travel distance and helping to improve the pollutant retention rate. The aeration zone is located below the material-carrying screw, with the air outlet pipe located in this aeration zone. The air bubbles generated by aeration rise to the surface and come into contact with the aerobic packing material during their ascent, ensuring the smooth progress of the aerobic reaction. The third inlet pipe is located at the top, while the third storage tank inlet is located at the bottom, allowing wastewater to flow by gravity. Furthermore, the material-carrying screw is detachable, facilitating subsequent replacement of the aerobic packing material and cleaning of the second tank. The selection and treatment principle of the aerobic packing material are common knowledge and will not be elaborated upon.

[0016] In the aforementioned carbon reduction system for rural domestic sewage, the material-carrying screw includes a main shaft and a spiral portion wound around the main shaft. An air passage with an open upper end is axially opened inside the main shaft. The upper end of the air passage is connected to the air outlet of the aeration device through a pipeline, and the lower end is connected to the air outlet pipe.

[0017] The spiral part is set on the main shaft to form an integral structure. An air passage is set inside the main shaft. The aeration device can be directly connected to the upper end of the air passage through the pipeline to realize the gas delivery to the air outlet pipe for aeration. This connection is detachable, simple in structure and easy to connect.

[0018] In the aforementioned carbon reduction system for rural domestic sewage, there are at least two air outlet pipes, which are evenly distributed circumferentially on the main shaft. The lower end of the main shaft is radially provided with a connecting screw hole that communicates with the air passage. The air outlet pipes are detachably connected to the connecting screw hole by external threads. Several micro-aeration holes are evenly distributed on the air outlet pipes.

[0019] Multiple air outlet pipes are evenly arranged around the circumference, and the micro-aeration holes on them form a circular aeration surface on the horizontal plane, which makes the aerobic packing material inside the loading screw, especially at the bottom, uniformly aerated. Moreover, the air outlet pipes can be detachably connected to the main shaft through a threaded structure, making disassembly and assembly convenient.

[0020] In the aforementioned carbon reduction system for rural domestic sewage, the second tank has several supporting protrusions arranged in a spiral pattern on its side wall, and these supporting protrusions support the material-carrying spiral upwards.

[0021] The outer circumferential side of the loading auger and / or the inner sidewall of the second pool are provided with an elastic layer for sealing and bonding.

[0022] A ring-shaped material-carrying mesh plate is horizontally arranged below the material-carrying screw. The material-carrying mesh plate is sleeved and fixed on the main shaft. A support ring with an L-shaped cross-section is arranged circumferentially on the lower side wall of the second pool. The material-carrying mesh plate is placed on the support ring, and its outer diameter is less than or equal to the distance from the inner side of the support boss to the center of the main shaft.

[0023] The distribution of the support bosses is adapted to the extension of the spiral portion of the loading screw, providing upward support from the underside of the spiral portion to improve loading capacity. The support bosses are also spirally distributed, allowing the loading screw to be loaded and unloaded via a thread-like meshing mechanism. An elastic layer is positioned between the outer side of the spiral portion and the side wall of the second tank, forming a sealed fit to prevent wastewater from bypassing the aerobic packing material and flowing directly down the second tank wall, thus improving the retention rate of pollutants. A loading mesh plate is installed below the loading screw, with mesh openings that allow water and air to pass through but not the aerobic packing material, sealing the bottom of the loading area. The loading mesh plate is annular, and its smaller outer diameter ensures that it is not blocked by the support bosses when the loading screw is screwed in or out. Furthermore, the annular support ring extending from the side wall of the second tank abuts against the bottom surface of the loading mesh plate, providing support while preventing the aerobic packing material from leaking out between the loading mesh plate and the tank side wall.

[0024] In the aforementioned carbon reduction system for rural domestic sewage, the ecological purification pond includes a third pond body. A fourth inlet and a fourth outlet are arranged opposite each other on the upper side wall of the third pond body. Submerged plants are planted in the bottom mud of the pond, and an ecological floating bed is provided on the water surface. Emergent plants are planted on the ecological floating bed, and microalgae purification units are cultivated in the water.

[0025] In the third tank, submerged plants, emergent plants, and microalgae purification units further purify the wastewater. Their photosynthesis fixes carbon dioxide, thus reducing carbon emissions. The fourth inlet and outlet are located at the top of the third tank, with the fourth outlet being lower, allowing for automatic outflow without external power. The selection and principles of the submerged plants, emergent plants, and microalgae purification units are common knowledge and will not be elaborated upon.

[0026] In the aforementioned carbon reduction system for rural domestic sewage, the inner end of the fourth outlet pipe is equipped with a filter screen to prevent the microalgae purification unit from escaping, and the outer end is equipped with a switch valve. A backflushing interface is connected to the fourth outlet pipe between the switch valve and the filter screen. The backflushing interface is used to input high-pressure water or air to backflush the filter screen.

[0027] A filter screen is located at the fourth water outlet to prevent the microalgae purification unit from flowing out with the water. A switch valve is used to open and close this fourth water outlet. A backwash port is used to backwash the filter screen. By closing the switch valve and introducing high-pressure water or air, the filter screen can be backwashed. The structure is simple and easy to operate. A corresponding high-pressure generating component is connected to the external end of the backwash port; this component is common knowledge and will not be elaborated upon.

[0028] Compared with the prior art, the present invention has the following main advantages:

[0029] 1. During normal photosynthesis in the ecological treatment pond, the aeration device can transport air with a high oxygen concentration to the bottom of the aerobic treatment pond through aeration. The air rises in the water, promoting aerobic reactions. At night, since the plants and microorganisms in the ecological purification pond only perform respiration, the carbon dioxide concentration in the pond is high. At this time, the aeration device draws air from outside the pond to ensure the oxygen concentration of the air input for aeration. In addition, the aeration device is powered by photovoltaic power generation components and / or wind power generation components, making it green and environmentally friendly.

[0030] 2. The baffle divides the inner cavity of the second tank into an S-shaped water passage. Wastewater must pass through this water passage before it can be discharged, which increases the movement distance of the wastewater and ensures that all wastewater must have sufficient effective contact with the biofilm packing, thereby improving the biofilm packing's ability to retain and filter pollutants.

[0031] 3. The inner cavity of the second tank is divided into a spiral loading zone by a material-carrying spiral. The movement path of the sewage after input is spiral, which increases the movement distance and helps to improve the interception rate of pollutants. The aeration zone is set below the material-carrying spiral, and the air outlet pipe is located in the aeration zone. The air bubbles generated by aeration float to the surface and come into contact with the aerobic packing material during the floating process, ensuring the smooth progress of the aerobic reaction.

[0032] 4. The spiral part is set on the main shaft to form an integral structure. An air passage is set inside the main shaft. The aeration device can be directly connected to the upper end of the air passage through the pipeline to realize the gas delivery to the air outlet pipe for aeration. This connection is detachable, simple in structure and easy to connect.

[0033] 5. The distribution of the support bosses is adapted to the extension form of the spiral portion of the loading screw, providing upward support from the underside of the spiral portion to improve loading capacity. Furthermore, the support bosses are also spirally distributed, allowing the loading screw to be loaded and unloaded via a thread-like meshing mechanism. An elastic layer is positioned on the outer side of the spiral portion between the second tank wall and the inner sidewall to form a sealed fit, preventing wastewater from bypassing the aerobic packing and flowing directly down the second tank wall, thus improving the retention rate of pollutants.

[0034] 6. The material-carrying mesh plate is circular, and its smaller outer diameter ensures that the material-carrying mesh plate will not be blocked by the support boss when the material-carrying screw is screwed in or out. Moreover, the support ring extending in a ring on the side wall of the second pool body abuts against the bottom surface of the material-carrying mesh plate, providing support while preventing the aerobic packing material from leaking out between the material-carrying mesh plate and the side wall of the pool body.

[0035] 7. The filter screen can be backwashed by turning off the switch valve and introducing high-pressure water or air. The structure is simple and the operation is convenient. Attached Figure Description

[0036] Figure 1This is a schematic diagram of the overall structure provided by this utility model;

[0037] Figure 2 This is a top view of the first pool body provided by this utility model;

[0038] Figure 3 This is a schematic diagram of the structure of the aerobic treatment tank provided by this utility model;

[0039] Figure 4 This is a schematic diagram of the structure of the ecological purification pool provided by this utility model;

[0040] Figure 5 This is a top view schematic diagram of the material-carrying screw provided by this utility model.

[0041] In the diagram, the components are: filtration sedimentation tank 1, first effluent outlet 11, anaerobic treatment tank 2, first tank body 21, second inlet 22, second effluent outlet 23, biofilm packing 24, baffle 25, water outlet 26, water passage 27, aerobic treatment tank 3, second tank body 31, material-carrying screw 32, aerobic packing 33, aeration zone 34, third inlet 35, third effluent outlet 36, main shaft 37, screw section 38, air passage 39, and micro-aeration. Hole 40, support boss 41, material carrier mesh plate 42, support ring 43, aeration device 5, selective air inlet pipe 51, first air inlet pipe 52, second air inlet pipe 53, three-way solenoid valve assembly 54, air outlet pipe 55, ecological purification tank 6, third tank body 61, fourth water inlet 62, fourth water outlet 63, submerged plants 64, ecological floating bed 65, emergent plants 66, microalgae purification unit 67, filter screen 68, switch valve 69, backflushing interface 70. Detailed Implementation

[0042] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0043] Specific implementation examples Figure 1-5 As shown, the carbon emission reduction system for rural domestic sewage includes a filtration sedimentation tank 1 for pretreatment. An anaerobic treatment tank 2, an aerobic treatment tank 3, and an ecological purification tank 6 are sequentially connected to the first outlet 11 of the filtration sedimentation tank 1. An air outlet pipe 55 connected to an aeration device 5 is introduced into the bottom of the aerobic treatment tank 3. A selective air inlet pipe 51 is connected to the air inlet of the aeration device 5. The selective air inlet pipe 51 is used to draw air from the open end of the ecological purification tank 6 during the day and to draw air from the atmosphere outside the ecological purification tank 6 at night. The aeration device 5 is powered by photovoltaic power generation components.

[0044] Specifically, this invention is used to treat rural domestic sewage. The filtration and sedimentation tank 1 is used for pretreatment of the sewage by filtration and sedimentation, separating solids of a certain volume—this is existing technology. The pretreated sewage then sequentially passes through an anaerobic treatment tank 2, an aerobic treatment tank 3, and an ecological purification tank 6 for further treatment. The anaerobic treatment tank 2 primarily removes organic matter, nitrogen, phosphorus, and sulfides from the sewage. The aerobic treatment tank 3 primarily removes organic matter and ammonia nitrogen. The ecological purification tank 6 further removes pollutants from the water through plants and microorganisms. The photosynthesis of plants and microorganisms can also fix carbon dioxide, thus contributing to carbon emission reduction. To ensure and even promote the normal operation of the aerobic reaction tank, this system is also equipped with an aeration device 5. This aeration device 5 can transport air with a high oxygen concentration from the ecological treatment tank to the bottom of the aerobic treatment tank 3 during normal photosynthesis. The air rises in the water, promoting aerobic reactions. At night, because the plants and microorganisms in the ecological purification tank 6 only perform respiration, the carbon dioxide concentration in the tank is high. At this time, the aeration device 5 draws air from outside the tank to ensure the oxygen concentration of the aeration air. Furthermore, the aeration device 5 is powered by photovoltaic power generation components, making it environmentally friendly. Overall, the flow of wastewater between the treatment tanks is driven by gravity due to the height difference. Only the aeration device 5 and the related structures of the air inlet pipe 51 require electricity, resulting in low power demand. The corresponding power generation components can provide sufficient power, allowing the system to be installed in environments with inadequate supporting power facilities. This results in low operating costs and low carbon emissions.

[0045] like Figure 1 As shown, the selected air intake pipe 51 includes a first air intake pipe 52 with its intake end located inside the ecological purification pool 6, and a second air intake pipe 53 with its intake end located outside the ecological purification pool 6. A three-way solenoid valve assembly 54 is provided between the first air intake pipe 52, the second air intake pipe 53 and the air inlet.

[0046] Specifically, the three-way solenoid valve assembly 54 is connected to the first air inlet pipe 52, the second air inlet pipe 53 and the air intake end of the aeration device 5 respectively. By controlling the opening and closing of the corresponding channels, the effect of selecting the air intake environment can be achieved. The switching action of the three-way solenoid valve assembly 54 can be automatically switched according to the time setting.

[0047] like Figure 1 , 2As shown, the anaerobic treatment tank 2 includes a square first tank body 21. The first tank body 21 contains biofilm packing material 24. A second inlet pipe 22 and a second outlet pipe 23 are respectively located on the left and right sides of the first tank body 21. The second outlet pipe 23 is lower than the second inlet pipe 22. Several vertically arranged baffles 25 are arranged parallel to and spaced between the second outlet pipe 23 and the second inlet pipe 22. The bottom end of each baffle 25 is connected to the bottom of the first tank body 21, and its front or rear side is perpendicularly connected to the side wall of the first tank body 21. The other side forms a water passage 26 between the baffles and the side wall of the first tank body 21. The water passages 26 of adjacent baffles 25 are staggered, forming an S-shaped water passage 27 with both ends connected to the second inlet pipe 22 and the second outlet pipe 23, respectively. The S-shaped water passage 27 contains biofilm packing material 24.

[0048] Specifically, the biofilm packing material 24 is used for wastewater treatment. A second inlet pipe 22 and a second outlet pipe 23 are provided on the first tank 21 for wastewater input and output. The two pipes are positioned opposite each other, ensuring that wastewater must pass through the biofilm packing material 24 within the tank. This process ensures the effective treatment by the biofilm packing material 24. The second outlet pipe 23 is lower in height, allowing discharge without the need for additional power components. A baffle 25 divides the inner cavity of the second tank 31 into an S-shaped water passage 27. Wastewater must pass through this water passage 27 before being output, increasing the wastewater's travel distance and ensuring that all wastewater must have sufficient effective contact with the biofilm packing material 24, thus improving the biofilm packing material 24's ability to retain and filter pollutants.

[0049] like Figure 1 , 3As shown in Figure 5, the aerobic treatment tank 3 includes a cylindrical second tank body 31. A detachable material-carrying screw 32 is installed inside the second tank body 31. A screw loading zone is formed between the material-carrying screw 32 and the side wall of the second tank body 31. The screw loading zone is filled with aerobic packing material 33. An aeration zone 34 is formed between the bottom of the material-carrying screw 32 and the bottom of the second tank body 31. An air outlet pipe 55 is located in the aeration zone 34. A third water inlet 35 located above the material-carrying screw 32 and a third water outlet 36 located below the material-carrying screw 32 are provided on the side wall of the second tank body 31. The material-carrying screw 32 includes a main shaft 37 and a spiral part 38 wound around the main shaft 37. An air passage 39 with an open upper end is axially opened inside the main shaft 37. The upper end of the air passage 39 is connected to the air outlet of the aeration device 5 through a pipe, and the lower end is connected to the air outlet pipe 55. Six air outlet pipes 55 are evenly distributed circumferentially on the main shaft 37. A connecting screw hole communicating with the air passage 39 is radially opened at the lower end of the main shaft 37. The air outlet pipes 55 are detachably connected to the connecting screw hole by external threads. Several micro-aeration holes 40 are evenly distributed on the air outlet pipes 55. Several support bosses 41 are spirally distributed on the side wall of the second pool body 31. The support bosses 41 support the material-carrying screw 32 upward. An elastic layer for sealing and contact is provided on the outer circumferential side of the material-carrying screw 32. A ring-shaped material-carrying mesh plate 42 is horizontally arranged below the material-carrying screw 32. The material-carrying mesh plate 42 is sleeved and fixed on the main shaft 37. A support ring 43 with an L-shaped cross section is arranged circumferentially on the lower side wall of the second pool body 31. The material-carrying mesh plate 42 is placed on the support ring 43, and its outer diameter is smaller than the distance from the inner side of the support boss 41 to the axis of the main shaft 37.

[0050] Specifically, the inner cavity of the second tank 31 is divided into a spiral loading zone by a material-carrying spiral 32. The movement path of the sewage after input is spiral-shaped, increasing the movement distance and helping to improve the retention rate of pollutants. The aeration zone 34 is located below the material-carrying spiral 32, and the air outlet pipe 55 is located in the aeration zone 34. The air bubbles generated by aeration float to the surface and come into contact with the aerobic packing material 33 during the floating process, ensuring the smooth progress of the aerobic reaction. The third water inlet 35 is located at the top, while the third water storage tank inlet is located at the bottom, allowing sewage to flow by gravity. In addition, the material-carrying spiral 32 is detachable, facilitating subsequent replacement of the aerobic packing material 33 and cleaning of the second tank 31. The spiral part 38 is set on the main shaft 37 to form an integral structure. An air passage 39 is set inside the main shaft 37. The aeration device 5 is directly connected to the upper end of the air passage 39 through a pipeline to deliver gas to the air outlet pipe 55 for aeration. This connection is detachable, simple in structure, and easy to connect. Six radiating air outlets 55, with micro-aeration holes 40 forming a circular aeration surface on the horizontal plane, ensure uniform aeration within the feed auger 32, especially in the aerobic packing 33 at the bottom. The air outlets 55 are detachably connected to the main shaft 37 via a threaded structure, facilitating easy assembly and disassembly. The distribution of the support bosses 41 corresponds to the extension of the spiral portion 38 of the feed auger 32, providing upward support from below the spiral portion 38 to enhance load-bearing capacity. The support bosses 41 are also spirally distributed, allowing the feed auger 32 to be installed and removed via a threaded engagement mechanism. An elastic layer is positioned between the outer side of the spiral portion 38 and the sidewall of the second tank 31, creating a sealed fit to prevent wastewater from bypassing the aerobic packing 33 and flowing directly down the wall of the second tank 31, thus improving the retention rate of pollutants. A material-carrying mesh plate 42 is provided below the material-carrying screw 32. The material-carrying mesh plate 42 has mesh openings that allow water and air to pass through but prevent the aerobic packing material 33 from passing through, thus sealing the bottom of the screw loading area. The material-carrying mesh plate 42 is annular, and its smaller outer diameter ensures that the material-carrying mesh plate 42 will not be blocked by the support boss 41 when the material-carrying screw 32 is screwed in or out. Moreover, the support ring 43 extending annularly on the side wall of the second pool body 31 abuts against the bottom surface of the material-carrying mesh plate 42, providing support while preventing the aerobic packing material 33 from leaking out between the material-carrying mesh plate 42 and the side wall of the pool body.

[0051] like Figure 1 , 4As shown, the ecological purification pond 6 includes a third pond body 61. A fourth inlet pipe 62 and a fourth outlet pipe 63 are arranged opposite each other on the upper side wall of the third pond body 61. Submerged plants 64 are planted on the bottom of the pond through bottom sediment. An ecological floating bed 65 is provided on the water surface, on which emergent plants 66 are planted. Microalgae purification units 67 are cultivated in the water. The inner end of the fourth outlet pipe 63 is equipped with a filter screen 68 to prevent the microalgae purification unit 67 from escaping, and the outer end is equipped with a switch valve 69. A backflushing interface 70 is connected to the fourth outlet pipe 63 between the switch valve 69 and the filter screen 68. The backflushing interface 70 is used to input high-pressure water to backflush the filter screen 68.

[0052] Specifically, in the third tank 61, submerged plants 64, emergent plants 66, and a microalgae purification unit 67 further purify the wastewater. Their photosynthesis fixes carbon dioxide, thus reducing carbon emissions. The fourth inlet 62 and the fourth outlet 63 are located at the top of the third tank 61, with the fourth outlet 63 being lower, allowing water to flow out automatically without external power. A filter screen 68 is located at the fourth outlet 63 to prevent the microalgae purification unit 67 from flowing out with the water. A switch valve 69 is used to open and close the fourth outlet 63, and a backwash port 70 is used to backwash the filter screen 68. By closing the switch valve 69 and introducing high-pressure water or air, the filter screen 68 can be backwashed. The structure is simple and easy to operate.

[0053] The specific working principle is as follows: Wastewater first enters the filtration and sedimentation tank 1, where solids of a certain volume are filtered out and settle at the bottom. The supernatant is output from the first outlet 11 and enters the anaerobic treatment tank 2. Within the first tank 21, the wastewater moves backward along the S-shaped water passage 27, contacting the biofilm packing material 24 during the process, where some pollutants are trapped and reacted. The anaerobic treated wastewater is output from the second outlet 23 and enters the aerobic treatment tank 3. Within the second tank 31, the wastewater moves downward along the spiral loading zone, contacting the aerobic packing material 33 during the process, where some pollutants are reacted and trapped. The wastewater then exits from the lower third outlet 36 and enters the ecological purification tank 6. The microalgae purification unit 67, the roots of emergent plants 66, and the submerged plants 64 in the third tank 61 further purify the water. Air with a high oxygen concentration in the tank is drawn in by the aeration device 5 and transported to the aerobic treatment tank 3, providing the oxygen required by the aerobic packing material 33. The treated effluent can then be discharged or utilized accordingly.

[0054] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A carbon reduction system for rural domestic sewage, comprising a filtration and sedimentation tank (1) for pretreatment, characterized in that, The first outlet (11) of the filtration sedimentation tank (1) is connected in sequence to an anaerobic treatment tank (2), an aerobic treatment tank (3), and an ecological purification tank (6). The bottom of the aerobic treatment tank (3) is connected to an air outlet pipe (55) connected to an aeration device (5). The air inlet of the aeration device (5) is connected to a selective air inlet pipe (51). The selective air inlet pipe (51) is used to draw air from the open end of the ecological purification tank (6) during the day and draw air from the atmosphere outside the ecological purification tank (6) at night. The aeration device (5) is powered by a photovoltaic power generation module and / or a wind power generation module.

2. The carbon reduction system for rural domestic sewage according to claim 1, characterized in that, The selected air intake pipe (51) includes a first air intake pipe (52) with its intake end located inside the ecological purification pool (6) and a second air intake pipe (53) with its intake end located outside the ecological purification pool (6). A three-way solenoid valve assembly (54) is provided between the first air intake pipe (52), the second air intake pipe (53) and the air inlet.

3. The carbon reduction system for rural domestic sewage according to claim 1, characterized in that, The anaerobic treatment tank (2) includes a square first tank body (21), and the first tank body (21) is provided with biofilm packing material (24). The first tank body (21) is provided with a second water inlet (22) and a second water outlet (23) on the left and right sides respectively. The second water outlet (23) is lower than the second water inlet (22).

4. The carbon reduction system for rural domestic sewage according to claim 3, characterized in that, A number of vertically arranged baffles (25) are arranged in parallel between the second outlet (23) and the second inlet (22). The bottom end of the baffle (25) is connected to the bottom of the first pool (21), the front or rear side is vertically connected to the side wall of the first pool (21), and the other side forms a water passage (26) between the baffle and the side wall of the first pool (21). The water passages (26) of adjacent baffles (25) are staggered to form an S-shaped water passage (27) that is connected at both ends to the second inlet (22) and the second outlet (23) respectively. The S-shaped water passage (27) is provided with biofilm packing (24).

5. The carbon reduction system for rural domestic sewage according to claim 1, characterized in that, The aerobic treatment tank (3) includes a cylindrical second tank body (31). A material-carrying screw (32) is detachably installed inside the second tank body (31). A screw loading area is formed between the material-carrying screw (32) and the side wall of the second tank body (31). The screw loading area is filled with aerobic packing material (33). An aeration area (34) is formed between the bottom of the material-carrying screw (32) and the bottom of the second tank body (31). The air outlet pipe (55) is located in the aeration area (34). A third water inlet (35) located above the material-carrying screw (32) and a third water outlet (36) located below the material-carrying screw are provided on the side wall of the second tank body (31).

6. The carbon reduction system for rural domestic sewage according to claim 5, characterized in that, The material-carrying screw (32) includes a main shaft (37) and a spiral part (38) wound around the main shaft (37). The main shaft (37) has an axially opened air passage (39) with an open upper end. The upper end of the air passage (39) is connected to the air outlet of the aeration device (5) through a pipeline, and the lower end is connected to the air outlet pipe (55).

7. The carbon reduction system for rural domestic sewage according to claim 5, characterized in that, There are at least two air outlet pipes (55), which are evenly distributed around the main shaft (37). The lower end of the main shaft (37) is radially provided with a connecting screw hole that communicates with the air passage (39). The air outlet pipes (55) are detachably connected to the connecting screw hole by external thread. Several micro aeration holes (40) are evenly distributed on the air outlet pipes (55).

8. The carbon reduction system for rural domestic sewage according to claim 5, characterized in that, The second pool body (31) has a number of supporting protrusions (41) arranged in a spiral pattern on its side wall, and the supporting protrusions (41) support the material-carrying spiral (32) upward. The outer circumferential side of the loading auger (32) and / or the inner sidewall of the second pool (31) are provided with elastic layers for sealing and bonding. A ring-shaped material-carrying mesh plate (42) is horizontally arranged below the material-carrying spiral (32). The material-carrying mesh plate (42) is sleeved and fixed on the main shaft (37). A support ring (43) with an L-shaped cross section is arranged circumferentially on the lower side wall of the second pool (31). The material-carrying mesh plate (42) is placed on the support ring (43), and its outer diameter is less than or equal to the distance from the inner side of the support boss (41) to the axis of the main shaft (37).

9. The carbon reduction system for rural domestic sewage according to any one of claims 1-8, characterized in that, The ecological purification pond (6) includes a third pond body (61). A fourth water inlet (62) and a fourth water outlet (63) are arranged opposite each other on the upper side wall of the third pond body (61). Submerged plants (64) are planted in the bottom mud of the pond. An ecological floating bed (65) is provided on the water surface. Emergent plants (66) are planted on the ecological floating bed (65). Microalgae purification units (67) are cultivated in the water.

10. The carbon reduction system for rural domestic sewage according to claim 9, characterized in that, The inner end of the fourth water outlet (63) is provided with a filter screen (68) to prevent the microalgae purification unit (67) from escaping, and the outer end is provided with a switch valve (69). A backflushing interface (70) is connected to the fourth water outlet (63) between the switch valve (69) and the filter screen (68). The backflushing interface (70) is used to input high-pressure water or air to backflush the filter screen (68).

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