Livestock and poultry breeding sewage treatment system

Abstract

The application discloses a livestock and poultry breeding sewage treatment system and relates to the technical field of livestock and poultry breeding sewage treatment.The aeration device comprises an aeration tank body, a water inlet is arranged at the top of the aeration tank body, an aeration mechanism is arranged in the aeration tank body, an exhaust port is arranged on one side of the water inlet, a material guide elbow is arranged at the bottom of the aeration tank body, a water outlet is arranged on one side of the material guide elbow, a gas production tank body is arranged at one end of the material guide elbow, a material discharge port is arranged at the bottom of the gas production tank body, and a gas collection port is arranged at the top of the gas production tank body.The livestock and poultry breeding sewage is subjected to sedimentation treatment, the excrement and manure settled at the bottom of the sewage is recycled and utilized, the soil nutrient demand in farmland planting is supplemented, the soil nutrient demand in farmland planting is recycled, the use efficiency of resources is improved, the methane produced by microorganisms in the sewage when decomposing organic matters is collected and utilized through the arrangement of the aeration device, the economic cost of breeding is effectively reduced, and the emission of greenhouse gases is reduced.

Description

Technical Field

[0001] This invention relates to the field of livestock and poultry breeding wastewater treatment technology, specifically a livestock and poultry breeding wastewater treatment system. Background Technology

[0002] With increasing global emphasis on sustainable agriculture and ecological environmental protection, the rapid development of livestock and poultry farming has led to a large amount of wastewater discharge, becoming a significant source of agricultural pollution. Livestock and poultry farm wastewater contains abundant organic matter, nitrogen, phosphorus, and other pollutants. If discharged directly without treatment, it can easily lead to eutrophication of water bodies, ecological imbalance, and groundwater pollution. Therefore, establishing an effective livestock and poultry farm wastewater treatment system is of paramount importance.

[0003] In wastewater treatment, aeration is a widely used biological treatment technology. Its principle is to introduce air into the wastewater, promoting the growth and metabolism of aerobic microorganisms. These microorganisms can effectively decompose organic matter in the wastewater, reducing its chemical oxygen demand (COD) and biological oxygen demand (BOD).

[0004] Biogas is an important byproduct of wastewater aeration treatment in livestock and poultry farming. Through anaerobic digestion technology, methane can be effectively generated when organic matter is decomposed by microorganisms in an oxygen-deficient environment. This methane can be collected and utilized as a clean energy source. Utilizing methane not only helps reduce energy costs for farms but also helps mitigate greenhouse gas emissions, thus offering significant environmental benefits.

[0005] In addition, the treated wastewater contains a large amount of nitrogen and phosphorus. These nutrients can be properly treated and transformed into high-efficiency nitrogen and phosphorus fertilizers, which can be reused in agricultural production to promote soil health and crop growth.

[0006] Therefore, a wastewater treatment system for livestock and poultry farming was developed. Summary of the Invention

[0007] The purpose of this invention is to provide a livestock and poultry breeding wastewater treatment system to solve the problems mentioned in the background art.

[0008] To solve the above-mentioned technical problems, the present invention provides the following technical solution: A livestock and poultry breeding wastewater treatment system includes the following steps: Step 1: Pass the livestock and poultry breeding wastewater through a screen to separate the impurities in the wastewater; Step 2: Pour the wastewater that has passed through the screen into the sedimentation tank to settle. Take out the manure residue that has settled to the bottom, dry it, and then use it for farmland planting. Step 3: Pump the wastewater from the top of the settling tank into the aeration device for aeration and settling, collect the methane produced in the anaerobic environment at the top, and discharge the sludge deposited at the bottom. Step 4: Discharge the aerated wastewater into the sedimentation tank, add flocculant, and immerse the suspended solids. Step 5: Add an oxidant to the wastewater in the sedimentation tank to oxidize the pollutants in the water, and then disinfect it through filtration to complete the purification treatment.

[0009] Step three includes the following steps: Step 3-a: After injecting the wastewater into the aeration device, carbon dioxide is injected into the aeration device for aeration. The bubbles accelerate the settling of internal impurities. Step 3-b: Utilizing the anaerobic environment created by carbon dioxide, microorganisms decompose organic matter to produce methane, and the floating methane is collected and utilized. Step 3-c: While injecting carbon dioxide into the aeration device, the sludge deposited at the bottom is quickly discharged by opening the valve by utilizing the change in air pressure.

[0010] The aeration device includes an aeration tank, with a water inlet at the top and an aeration mechanism inside. An exhaust port is located on one side of the water inlet, a guide pipe is located at the bottom of the aeration tank, an outlet is located on one side of the guide pipe, a gas generating tank is installed at one end of the guide pipe, a discharge port is located at the bottom of the gas generating tank, and an air collecting port is located at the top of the gas generating tank. Wastewater is injected into the aeration tank through the inlet, and then the aeration mechanism is started to aerate the wastewater. The gas that rises and is squeezed out from the top is collected through the exhaust port. After the wastewater is aerated and settled by the bubbles, the sludge settles to the bottom of the aeration tank. The exhaust port is closed and aeration continues. The valve on the discharge port is opened, and the bottom sludge is squeezed into the gas generating tank by air pressure. The discharge port is U-shaped, and the sludge falls into the bottom of the gas generating tank from the end of the discharge port. During the sludge falling, the bubbles containing impurities inside are removed, the internal gas floats up and is collected through the gas collection port, and the bottom sludge is discharged through the discharge port.

[0011] The exhaust port and gas collection port are connected to a gas storage tank, which is used to collect the gases generated inside the aeration tank and the gas-producing tank. The gases stored inside the gas storage tank include excess carbon dioxide generated during aeration by injecting carbon dioxide into the aeration tank, and methane gas produced by the decomposition of organic matter by microorganisms in the oxygen-deficient environment inside. Since carbon dioxide is heavier than methane, exhaust valves are installed at the top and bottom of the gas storage tank. The gas containing a large amount of methane is collected through the exhaust valve at the top, and the carbon dioxide is discharged and recovered through the exhaust valve at the bottom for subsequent aeration processing.

[0012] The aeration mechanism includes a drive motor, which is fixedly connected to the top of the aeration tank. The output shaft of the drive motor is fixedly connected to a central rotating rod via a coupling. One end of the central rotating rod is movably engaged with a retaining sleeve, and a float plate is connected to the outer wall of the retaining sleeve. When the drive motor is started, it drives the float plate to rotate via the central rotating rod, stirring the wastewater inside the aeration tank, accelerating the contact between internal air bubbles and impurities, and improving aeration and settling efficiency.

[0013] The float plate is designed as a sealed hollow structure, and a vertical groove is provided on the central rotating rod. The retaining sleeve is movably engaged with the central rotating rod through the groove. Due to the hollow structure of the float plate, it is suspended on the surface of the sewage inside the aeration tank. As the float plate rotates under the drive motor, it simultaneously scrapes away suspended solids on the surface of the sewage, preventing the accumulation of suspended solids from affecting the aeration of air bubbles and preventing air bubble buildup.

[0014] An aeration pipe is installed at the bottom of the central rotating rod. An aeration port is installed on the inner wall of the aeration pipe. A sliding sleeve is movably connected to the inner wall of the aeration pipe, and a sliding plate is movably engaged with the inner wall of the sliding sleeve. The interior of the central rotating rod is hollow. The central rotating rod is connected to the aeration port, and an air supply device is connected to the end of the central rotating rod furthest from the aeration port. Carbon dioxide gas is injected into the central rotating rod through the air supply device and ejected from the aeration port. Bubbles are then blown out through multiple small holes on the surface of the aeration pipe, thus performing aeration processing.

[0015] The inner diameter of the sliding sleeve matches the aeration port, and the aeration pipe is inclined upwards relative to the horizontal plane. While aeration occurs on the inner wall of the aeration pipe, the central rotating rod is driven by a drive motor to rotate the aeration pipe. Under centrifugal force, the sliding sleeve slides to the end of the aeration pipe. When the rotation of the aeration pipe and aeration stop, the centrifugal force disappears, and the sliding sleeve slides along the inner wall of the aeration pipe under gravity. It engages with the aeration port through the inner wall of the sliding sleeve, working in conjunction with a sliding plate to close and protect the aeration port, preventing backflow of sewage. As the air pressure inside the aeration pipe decreases, the sliding plate slides along the inner wall of the sliding sleeve to balance the internal pressure changes, preventing impurities from clogging the small holes on the outer wall of the aeration pipe. Simultaneously, it provides sliding buffering when closing the aeration port, reducing collision wear and extending the service life of the aeration port.

[0016] Compared with the prior art, the beneficial effects achieved by the present invention are: This invention treats livestock and poultry wastewater through sedimentation, recycling the settled manure at the bottom to supplement soil nutrients in farmland, thus improving resource utilization efficiency. The aeration device collects and utilizes methane produced by microorganisms decomposing organic matter in the wastewater, effectively reducing the economic cost of livestock farming, mitigating greenhouse gas emissions, and enhancing environmental friendliness. During aeration, the aeration mechanism quickly self-seales the aeration ports after aeration, preventing wastewater from eroding them and avoiding the problem of negative pressure drawing in foreign objects that clog the aeration holes. Attached Figure Description

[0017] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the livestock and poultry breeding wastewater transportation process of the present invention; Figure 2 This is a schematic diagram of the wastewater treatment system of the present invention; Figure 3 This is a schematic diagram of the aeration device structure of the present invention; Figure 4 This is a schematic cross-sectional view of the aeration device of the present invention; Figure 5 This is a schematic diagram of the aeration mechanism of the present invention; Figure 6 This is a schematic diagram of the connection structure between the float and the central rotating rod of the present invention; Figure 7 This is a schematic cross-sectional view of the aeration mechanism of the present invention; Figure 8 This is the invention Figure 7 Enlarged schematic diagram of the structure at point A in the middle.

[0018] In the picture: 1. Grille; 2. Settling tank; 3. Aeration device; 301. Aeration tank; 302. Inlet; 303, Aeration mechanism; 3031, Drive motor; 3032, Central rotating rod; 3033, Sleeve; 3034, Float; 3035, Aeration pipe; 3036, Aeration port; 3037, Sliding sleeve; 3038, Slide plate; 304. Exhaust port; 305. Material guide bend; 306. Water outlet; 307. Gas generating tank; 308. Discharge port; 309. Gas collection port. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] Please see Figures 1-8 The present invention provides the following technical solution: A livestock and poultry breeding wastewater treatment system includes the following steps: Step 1: Pass the livestock and poultry breeding wastewater through screen 1 to separate the impurities in the wastewater; Step 2: Pour the sewage that has passed through the screen 1 into the sedimentation tank 2 for sedimentation, take out the manure residue that has settled to the bottom, dry it and then use it for farmland planting; Step 3: Extract the wastewater from the top of sedimentation tank 2 into aeration device 3 for aeration and sedimentation, collect the methane produced in the anaerobic environment at the top, and discharge the sludge deposited at the bottom. Step 4: Discharge the aerated wastewater into sedimentation tank 2, add flocculant, and perform sedimentation treatment on the suspended solids; Step 5: Add an oxidant to the wastewater in sedimentation tank 2 to oxidize the pollutants in the water, and then disinfect it through filtration to complete the purification treatment.

[0021] Step three includes the following steps: Step 3-a: After the wastewater is injected into the aeration device 3, carbon dioxide is injected into the aeration device 3 for aeration. The bubbles accelerate the settling of internal impurities. Step 3-b: Utilizing the anaerobic environment created by carbon dioxide, microorganisms decompose organic matter to produce methane, and the floating methane is collected and utilized. Step 3-c: While injecting carbon dioxide into the aeration device 3, the sludge deposited at the bottom is quickly discharged by opening the valve using the change in air pressure.

[0022] The aeration device 3 includes an aeration tank 301, an inlet 302 at the top of the aeration tank 301, an aeration mechanism 303 inside the aeration tank 301, an exhaust port 304 on one side of the inlet 302, a guide pipe 305 at the bottom of the aeration tank 301, an outlet 306 on one side of the guide pipe 305, a gas generating tank 307 installed at one end of the guide pipe 305, a discharge port 308 at the bottom of the gas generating tank 307, and an air collecting port 309 at the top of the gas generating tank 307. Wastewater is injected into the aeration tank 301 through the inlet 302. Then, the aeration mechanism 303 is started to aerate the wastewater. The gas that rises and is squeezed out from the top is collected through the exhaust port 304. After the wastewater is aerated and settled by the bubbles, the sludge settles to the bottom of the aeration tank 301. The exhaust port 304 is closed and aeration continues. The valve on the discharge port 308 is opened. The bottom sludge is squeezed into the gas generating tank 307 by air pressure. The discharge port 308 is U-shaped. The sludge falls into the bottom of the gas generating tank 307 from the end of the discharge port 308. During the sludge falling, the bubbles containing impurities inside are removed. The internal gas floats up and is collected through the gas collection port 309. The bottom sludge is discharged through the discharge port 308.

[0023] The exhaust port 304 and the gas collection port 309 are connected to a gas storage tank, which is used to collect the gases generated inside the aeration tank 301 and the gas-producing tank 307. The gases stored inside the gas storage tank include excess carbon dioxide gas generated by aeration of carbon dioxide injected into the aeration tank 301, and methane gas generated by the decomposition of organic matter by microorganisms in the oxygen-deficient environment inside. Since carbon dioxide is heavier than methane gas, exhaust valves are installed at the top and bottom of the gas storage tank. The gas containing a large amount of methane is collected through the exhaust valve at the top, and the carbon dioxide is discharged and recovered through the exhaust valve at the bottom for subsequent aeration processing.

[0024] The aeration mechanism 303 includes a drive motor 3031, which is fixedly connected to the top of the aeration tank 301. The output shaft of the drive motor 3031 is fixedly connected to a central rotating rod 3032 via a coupling. One end of the central rotating rod 3032 is movably engaged with a retaining sleeve 3033, and a float plate 3034 is connected to the outer wall of the retaining sleeve 3033. When the drive motor 3031 is started, it drives the float plate 3034 to rotate via the central rotating rod 3032, thereby stirring the sewage inside the aeration tank 301, accelerating the contact between internal air bubbles and impurities, and improving aeration and settling efficiency.

[0025] The float plate 3034 is designed as a sealed hollow structure, and a vertical groove is provided on the central rotating rod 3032. The retaining sleeve 3033 is movably engaged with the central rotating rod 3032 through the groove. Due to the hollow structure of the float plate 3034, it is suspended on the surface of the sewage inside the aeration tank 301. As the float plate 3034 rotates under the drive of the drive motor 3031, it simultaneously scrapes the suspended solids on the surface of the sewage, preventing the accumulation of suspended solids from affecting the aeration of bubbles and preventing bubble buildup.

[0026] An aeration pipe 3035 is installed at the bottom of the central rotating rod 3032. An aeration port 3036 is installed on the inner wall of the aeration pipe 3035. A sliding sleeve 3037 is movably connected to the inner wall of the aeration pipe 3035. A sliding plate 3038 is movably engaged with the inner wall of the sliding sleeve 3037. The interior of the central rotating rod 3032 is hollow. The central rotating rod 3032 is connected to the aeration port 3036. An air supply device is connected to the end of the central rotating rod 3032 away from the aeration port 3036. Carbon dioxide gas is injected into the central rotating rod 3032 through the air supply device and ejected from the aeration port 3036. Bubbles are blown out through multiple small holes on the surface of the aeration pipe 3035, thus performing aeration processing.

[0027] The inner diameter of the sliding sleeve 3037 matches that of the aeration port 3036, and the aeration pipe 3035 is inclined upward about the horizontal plane. While aeration occurs on the inner wall of aeration pipe 3035, the central rotating rod 3032 driven by the drive motor 3031 rotates the aeration pipe 3035. Under the action of centrifugal force, the sliding sleeve 3037 slides to the end of the aeration pipe 3035. When the rotation of the aeration pipe 3035 and aeration stop, the centrifugal force disappears, and the sliding sleeve 3037 slides along the inner wall of the aeration pipe 3035 under the action of gravity. The inner wall of the sliding sleeve 3037 engages with the aeration port 3036, and together with the sliding plate 3038, it closes and protects the aeration port 3036 to prevent the backflow of sewage. As the air pressure inside the aeration pipe 3035 decreases, the sliding plate 3038 slides along the inner wall of the sliding sleeve 3037 to balance the internal pressure change and prevent impurities from clogging the small holes on the outer wall of the aeration pipe 3035. At the same time, it provides sliding buffer when closing the aeration port 3036, reduces collision wear, and extends the service life of the aeration port 3036.

[0028] Working principle of the invention: First, the livestock and poultry breeding wastewater to be treated is screened through a screen 1 to separate the impurities in the wastewater. The wastewater passing through the screen 1 is poured into a settling tank 2 for settling. The manure residue that has settled to the bottom is taken out through the opening at the bottom of the settling tank 2. The manure residue is dried and disinfected. The dried manure residue is used as fertilizer for farmland planting. Then, the wastewater at the top of the settling tank 2 is injected into an aeration device 3 through the opening at the top of the settling tank 2. The wastewater is then processed by aeration and settling through the aeration device 3. Wastewater is injected into the aeration tank 301 through the inlet 302. Then, the aeration mechanism 303 is started to aerate the wastewater. The gas that rises and is squeezed out from the top is collected through the exhaust port 304. After the wastewater is aerated and settled by the bubbles, the sludge settles to the bottom of the aeration tank 301. The exhaust port 304 is closed and aeration continues. The valve set on the discharge port 308 is opened. The bottom sludge is squeezed into the gas generating tank 307 by air pressure. The discharge port 308 is set in a U-shape. The sludge falls into the bottom of the gas generating tank 307 from the end of the discharge port 308. During the sludge falling, the bubbles containing impurities inside are removed. The internal gas floats up and is collected through the gas collection port 309. The bottom sludge is discharged through the discharge port 308. The exhaust port 304 and the gas collection port 309 are connected to a gas storage tank. The gas stored inside the gas storage tank includes excess carbon dioxide gas generated by aeration of carbon dioxide injected into the aeration tank 301, and methane gas generated by the decomposition of organic matter by microorganisms in the oxygen-deficient environment inside. Since carbon dioxide is heavier than methane gas, exhaust valves are set at the top and bottom of the gas storage tank. The gas containing a large amount of methane inside is collected through the exhaust valve at the top, and then the carbon dioxide is discharged and recovered through the exhaust valve at the bottom for subsequent aeration processing. Start the drive motor 3031. The drive motor 3031 drives the float plate 3034 to rotate through the central rotating rod 3032, which stirs the sewage inside the aeration tank 301, accelerates the contact between the internal bubbles and impurities, and improves the aeration and settling efficiency. Due to the hollow structure of the float plate 3034, the float plate 3034 is suspended on the surface of the sewage inside the aeration tank 301. As the float plate 3034 rotates under the drive motor 3031, it also scrapes the suspended matter on the surface of the sewage, avoiding the impact of suspended matter accumulation on the aeration of bubbles and preventing bubble accumulation. During aeration, carbon dioxide gas is injected into the central rotating rod 3032 through the air supply device and sprayed out through the aeration port 3036. Bubbles are then blown out through multiple small holes on the surface of the aeration pipe 3035, thus performing aeration. While the inner wall of the aeration pipe 3035 is aerated, the central rotating rod 3032 is driven by the drive motor 3031 to rotate the aeration pipe 3035. Under the action of centrifugal force, the sliding sleeve 3037 slides to the end of the aeration pipe 3035. When the rotation of the aeration pipe 3035 and aeration stop, the centrifugal force disappears, and the sliding sleeve 3037... Under the influence of gravity, 037 slides along the inner wall of the aeration pipe 3035 and engages with the aeration port 3036 through the inner wall of the sliding sleeve 3037. Together with the sliding plate 3038, it closes and protects the aeration port 3036 to prevent the backflow of sewage. As the air pressure inside the aeration pipe 3035 decreases, the sliding plate 3038 slides along the inner wall of the sliding sleeve 3037 to balance the internal pressure change and prevent impurities from clogging the small holes on the outer wall of the aeration pipe 3035. At the same time, it provides sliding buffer when closing the aeration port 3036, reducing collision wear and extending the service life of the aeration port 3036.

[0029] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0030] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A livestock and poultry breeding wastewater treatment system, characterized in that, Includes a screen (1), a settling tank (2), and an aeration device (3): The aeration device (3) includes an aeration tank (301), an air supply device, an air production tank (307), and an air storage tank; The aeration tank (301) is provided with an inlet (302) and an exhaust port (304) at the top, and a guide pipe (305) at the bottom. The guide pipe (305) has an outlet (306) on one side and is connected to the gas generating tank (307) at the other end. The gas generating tank (307) is provided with a U-shaped discharge port (308) at the bottom and an air collecting port (309) at the top. The exhaust port (304) and the air collecting port (309) are respectively connected to the gas storage tank through pipelines. The aeration tank (301) is equipped with an aeration mechanism (303), which includes a drive motor (3031), a central rotating rod (3032), a float (3034), and an upwardly inclined aeration pipe (3035). The drive motor (3031) is fixed to the top of the aeration tank (301) and drives the central rotating rod (3032) to rotate. A vertical groove is opened on the outer wall of the central rotating rod (3032), and a movable retaining belt is connected in the groove. A sleeve (3033) for sealing the hollow float plate (3034); the bottom end of the central rotating rod (3032) is connected to the aeration pipe (3035), the inner wall of the aeration pipe (3035) is equipped with an aeration port (3036), the inner wall of the aeration pipe (3035) is slidably fitted with a sliding sleeve (3037), and the inner wall of the sliding sleeve (3037) is movably engaged with a sliding plate (3038); the hollow channel of the central rotating rod (3032) connects the air supply device and the aeration port (3036). The steps involved in processing using this system include: Step 1: Livestock and poultry wastewater is screened through a screen (1) to remove impurities; Step 2: Wastewater enters the sedimentation tank (2) for sedimentation, and the bottom manure is scooped out, dried, and returned to the field; Step 3: The supernatant from the settling tank (2) is sent into the aeration tank (301), and the air supply device supplies air to the hollow central rotating rod (3032). , An oxygen-deficient environment is created by releasing air through the aeration port (3036) of the aeration pipe (3035), where microorganisms decompose organic matter in the sewage to generate methane. The drive motor (3031) drives the central rotating rod (3032) to rotate, and the float plate (3034) rotates along the chute, suspended on the liquid surface, to scrape off the surface-accumulated suspended matter and disperse air bubbles. The rotation generates centrifugal force, causing the sliding sleeve (3037) to slide to the end of the aeration pipe (3035). After aeration is completed and the machine stops, the centrifugal force disappears, and the sliding sleeve (3037) slides down under gravity to block the aeration port (3036). The sliding plate (3038) balances the air pressure in the pipe to prevent sewage backflow from clogging the aeration port (3036). The pressure inside the tank is formed, and the bottom sludge is pressed into the gas generating tank (307) through the guide pipe (305). The sludge falls through the U-shaped discharge port (308) to remove the entrained air bubbles, and the methane gas floats up and is sent into the gas storage tank through the gas collecting port (309). Step 4: After aeration, the effluent is returned to the sedimentation tank (2), and flocculant is added to settle the suspended solids; Step 5: Add oxidant to oxidize and degrade pollutants, filter and disinfect to complete the effluent purification; The gas storage tank is layered for storage. Methane is recovered from the bottom of the storage tank. The gas is repeatedly aerated by a circulating gas supply device, and the purified methane at the top is used as fuel for the aquaculture farm.

2. The livestock and poultry breeding wastewater treatment system according to claim 1, characterized in that, The gas storage tank is equipped with upper and lower layered gas outlet valves. The lower valve discharges carbon dioxide, which has a higher density, while the upper valve outputs high-purity methane. After carbon dioxide is recovered, it is connected to the gas supply device for circulating aeration.

3. The livestock and poultry breeding wastewater treatment system according to claim 1, characterized in that, The inner diameter of the inner wall of the sliding sleeve (3037) is perfectly matched with the outer diameter of the aeration port (3036). After the machine stops and the sliding sleeve slides down, it completely covers the aeration port (3036) to achieve sealing protection.

4. The livestock and poultry breeding wastewater treatment system according to claim 1, characterized in that, The sleeve (3033) slides adaptively up and down along the groove of the central rotating rod (3032) with the buoyancy of the float plate (3034), so that the float plate (3034) always keeps in contact with the sewage surface to rotate, scrape bubbles, and clean the surface scum.

5. A livestock and poultry breeding wastewater treatment system according to claim 1, characterized in that, The bottom U-shaped discharge port (308) of the gas-generating tank (307) forms a water seal structure to prevent methane gas in the tank from leaking out with the sludge. During the sludge falling process, it automatically peels off the tiny air bubbles that are trapped inside, thereby improving the purity of methane collection.

6. A livestock and poultry breeding wastewater treatment system according to claim 1, characterized in that, In step three, carbon dioxide is introduced to create an anaerobic environment for methanogenesis. Simultaneously, the sludge is automatically pressed and transported by the internal air pressure of the tank, eliminating the need for an additional sludge transport pump and reducing equipment energy consumption.

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