Livestock and poultry breeding wastewater treatment system

Abstract

The utility model discloses a livestock and poultry breeding wastewater treatment system which comprises a pretreatment tank communicated with a water outlet of a livestock and poultry farm, a regulating tank, a solid-liquid separator, a UASB (Upflow Anaerobic Sludge Blanket) reactor, a PH (Potential of Hydrogen) regulating tank, a first-stage anaerobic tank, a first-stage aerobic tank, a nitrification liquid backflow tank, a second-stage anaerobic tank, a second-stage aerobic tank, a first sedimentation tank, a Fenton reaction tank, a flocculation reaction tank and a second sedimentation tank are sequentially communicated with the rear end of the pretreatment tank through pipelines, upright posts are arranged on two side surfaces of the pretreatment tank, and two parallel guide rails are arranged on the upright posts; a pretreatment device for removing impurities in the pretreatment tank is slidably arranged on the guide rail. According to the utility model, impurities in wastewater can be removed in advance, the impurities are prevented from blocking pipelines in a subsequent treatment system and damaging equipment, a manual fishing mode is not needed in the removal process, the labor intensity of workers is reduced, and time and labor are saved.

Description

Technical Field

[0001] The utility model relates to the technical field of wastewater treatment, in particular to a livestock and poultry breeding wastewater treatment system. Background Art

[0002] With the rapid development of intensive livestock and poultry farming, the problem of livestock and poultry wastewater pollution is becoming increasingly prominent. Livestock and poultry wastewater not only contains high concentrations of COD and nitrogen and phosphorus, seriously polluting the surrounding aquatic environment, but also contains low-concentration yet highly hazardous pollutants such as antibiotics (such as sulfonamides, macrolides, tetracyclines, and fluoroquinolones) and heavy metals (copper, arsenic, zinc, lead, and nickel), posing a significant potential threat to human health. However, due to technical and economic reasons, most intensive livestock and poultry farming wastewater in my country is not properly treated, posing severe challenges to the ecological environment and human health. Comprehensive treatment of intensive livestock and poultry farming wastewater is imperative.

[0003] Currently, livestock and poultry wastewater contains a large amount of debris, such as weeds, suspended solids, sand and gravel, and waste. If the debris is not removed in advance, it is easy to cause pipe blockage or equipment damage in the subsequent treatment system, thereby reducing the system's treatment efficiency. If manual scooping is used, the labor intensity is high, time-consuming and labor-intensive. Utility Model Content

[0004] The purpose of this utility model is to provide a livestock and poultry breeding wastewater treatment system, which can pre-clear the debris inside the wastewater to prevent the debris from clogging the pipes in the subsequent treatment system and damaging the equipment. The cleaning process does not require manual scooping, which reduces the labor intensity and saves time and effort.

[0005] In order to solve the above technical problems, the present invention adopts the following solutions:

[0006] A livestock and poultry breeding wastewater treatment system includes a pretreatment tank connected to a drainage outlet of a livestock and poultry breeding farm. The rear end of the pretreatment tank is connected to a regulating tank, a solid-liquid separator, a UASB reactor, a pH regulating tank, a primary anaerobic tank, a primary aerobic tank, a nitrification liquid reflux tank, a secondary anaerobic tank, a secondary aerobic tank, a first sedimentation tank, a Fenton reaction tank, a flocculation reaction tank, and a second sedimentation tank. Columns are provided on both sides of the pretreatment tank, and two parallel guide rails are provided on the columns. A pretreatment device for removing debris inside the pretreatment tank is slidably provided on the guide rails.

[0007] In this system, the regulating tank is used to regulate the flow and water quality of wastewater to ensure the stable operation of subsequent treatment units. By mixing and storing wastewater, water quality fluctuations can be balanced to provide stable water inlet conditions for subsequent treatment. The solid-liquid separator further separates suspended matter (such as fine particles, sludge, etc.) in the wastewater from the water body to improve the efficiency of subsequent biochemical treatment. The UASB reactor (upflow anaerobic sludge blanket reactor) uses anaerobic microorganisms to degrade organic matter in the wastewater under anaerobic conditions and produces by-products such as biogas. The pH regulating tank adjusts the pH value of the wastewater to meet the optimal operating conditions of the subsequent treatment process. The first-level anaerobic tank and the first-level aerobic tank: through the two biochemical treatment methods of anaerobic and aerobic, the organic matter in the wastewater is further degraded, and at the same time, some nutrients such as nitrogen and phosphorus are removed, and nitrate Chemical liquid return tank: returns part of the effluent from the aerobic tank to the front end of the anaerobic tank, and uses the nitrifying bacteria in it to carry out denitrification to reduce the total nitrogen content in the wastewater. Secondary anaerobic tank and secondary aerobic tank: provide additional biochemical treatment time to ensure that the organic matter and nutrients in the wastewater are more thoroughly removed. First sedimentation tank: removes suspended matter and biological sludge in the wastewater through gravity sedimentation. Fenton reaction tank: uses the strong oxidizing property of Fenton reagent (usually iron ions and hydrogen peroxide) to oxidize and decompose difficult-to-biodegrade organic matter in the wastewater, thereby improving the biodegradability of the wastewater. Flocculation reaction tank and second sedimentation tank: by adding flocculants, the tiny suspended matter and colloidal particles in the wastewater are aggregated into larger flocs, which are then settled by gravity in the second sedimentation tank to further purify the wastewater. A pretreatment tank is set up in front of the regulating tank. The main purpose of the pretreatment tank is to carry out preliminary physical treatment of livestock and poultry breeding wastewater to prevent debris from clogging or damaging subsequent treatment equipment. The pretreatment device is installed on the guide rails on both sides of the pretreatment tank and can be slidably operated to automatically clean up the debris in the pretreatment tank, thereby improving the automation level and operation efficiency of the system. After the debris is cleared in advance, it is not easy to cause pipe blockage or equipment damage in the subsequent treatment system, thereby improving the treatment efficiency of the system, avoiding the use of manual scooping method, reducing labor intensity, and saving time and effort.

[0008] Optionally, the pretreatment device includes a mounting seat and a grid-shaped collecting box. The size of the collecting box is adapted to the internal shape and size of the pretreatment tank. The mounting seat is slidably arranged on the guide rail. A lifting motor is provided on the top surface of the mounting seat. The output shaft of the lifting motor is connected to a roller. A steel wire rope is wound on the roller. The lower end of the steel wire rope passes through a through hole on the mounting seat and is connected to the collecting box. A driving motor is provided on the bottom surface of the mounting seat for driving the mounting seat to move along the length direction of the guide rail.

[0009] Optionally, the collection box is composed of a plurality of mesh panels combined into a box-like structure with an open top.

[0010] Optionally, the grid plate on the bottom surface of the collecting box is composed of two symmetrical sub-grid plates, one end of the sub-grid plate is hinged to the collecting box, and the two sub-grid plates are closed to seal the bottom of the collecting box.

[0011] Optionally, corresponding fixing sleeves are provided on the bottom surfaces of the two sub-grid plates, and both ends of the fixing sleeves are open. When the bottom of the collecting box is closed, fixing rods are inserted into the two fixing sleeves.

[0012] Optionally, the lifting motor is a three-phase asynchronous motor with a built-in braking device.

[0013] Optionally, the drive motor is a double-headed motor having two output shafts. The double-headed motor is fixed to the bottom of the mounting seat and is located between the two guide rails. The bottom of the guide rails is provided with a plurality of teeth along its length. Both output shafts of the double-headed motor are fixed to mesh with the teeth on the bottom of the guide rails.

[0014] Optionally, baffles for limiting the movement range of the mounting seat are provided at both ends of the guide rail.

[0015] Optionally, a plurality of columns are provided along the length direction of the guide rail, the upper ends of the columns are fixedly connected to the side surfaces of the guide rail, and the lower ends of the guide rails are fixed on the hard ground.

[0016] Optionally, two UASB reactors are provided, including a primary UASB reactor and a secondary UASB reactor, the primary UASB reactor and the secondary UASB reactor are sequentially arranged between the solid-liquid separator and the pH regulating tank, and a pH regulating tank is provided between the nitrification liquid reflux tank and the secondary anaerobic tank.

[0017] The utility model has the beneficial effects:

[0018] 1. In the present invention, a pretreatment tank is set at the front end of the regulating tank. The main purpose of the pretreatment tank is to carry out preliminary physical treatment of livestock and poultry breeding wastewater to prevent debris from clogging or damaging subsequent treatment equipment. The pretreatment device is installed on the guide rails on both sides of the pretreatment tank and can be slidably operated to automatically clean up the debris in the pretreatment tank, thereby improving the automation level and operation efficiency of the system. After the debris is cleared in advance, it is not easy to cause pipeline blockage or equipment damage in the subsequent treatment system, thereby improving the treatment efficiency of the system, avoiding the use of manual scooping method for treatment, reducing labor intensity, and saving time and effort. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the system structure of the utility model;

[0020] Figure 2 It is a structural schematic diagram of the pretreatment device;

[0021] Figure 3 It is a side structural schematic diagram of the pretreatment device;

[0022] Figure 4 This is a structural diagram of the collection cage with the sub-grid plate at the bottom opened.

[0023] Figure markings: 1-guide rail, 2-mounting seat, 3-hoisting motor, 4-drum, 5-driving gear, 6-wire rope, 7-collecting cage, 701-grid plate, 7011-sub-grid plate, 8-pretreatment tank, 9-driving motor, 10-fixing rod, 11-fixing sleeve, 12-column, 13-baffle, 14-chute, 15-through hole. DETAILED DESCRIPTION

[0024] The present invention will be further described in detail below in conjunction with the embodiments and drawings, but the implementation manner of the present invention is not limited thereto.

[0025] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "longitudinal", "lateral", "horizontal", "inside", "outside", "front", "back", "top", "bottom", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, or are the orientation or position relationship in which the utility model product is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0026] In the description of the present invention, it should also be noted that, unless otherwise expressly specified or limited, the terms "disposed," "opened," "installed," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to mechanical connections or electrical connections; they may refer to direct connections or indirect connections through an intermediate medium; and they may refer to internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0027] Example

[0028] A livestock and poultry breeding wastewater treatment system includes a pretreatment tank 8 connected to the drainage outlet of the livestock and poultry breeding farm. The rear end of the pretreatment tank 8 is connected to a regulating tank, a solid-liquid separator, a UASB reactor, a pH regulating tank, a primary anaerobic tank, a primary aerobic tank, a nitrification liquid reflux tank, a secondary anaerobic tank, a secondary aerobic tank, a first sedimentation tank, a Fenton reaction tank, a flocculation reaction tank, and a second sedimentation tank. Columns 12 are provided on both sides of the pretreatment tank 8. Two parallel guide rails 1 are provided on the columns 12. A pretreatment device for removing debris inside the pretreatment tank 8 is slidably provided on the guide rails 1.

[0029] In this embodiment, Figure 1 As shown, the regulating tank is used to regulate the flow and water quality of wastewater to ensure the stable operation of subsequent treatment units. By mixing and storing wastewater, water quality fluctuations can be balanced to provide stable water inlet conditions for subsequent treatment. The solid-liquid separator further separates suspended matter (such as fine particles, sludge, etc.) in the wastewater from the water body to improve the efficiency of subsequent biochemical treatment. The UASB reactor (upflow anaerobic sludge blanket reactor) uses anaerobic microorganisms to degrade organic matter in the wastewater under anaerobic conditions and produces by-products such as biogas. The pH regulating tank adjusts the pH value of the wastewater to meet the optimal operating conditions of the subsequent treatment process. The first-level anaerobic tank and the first-level aerobic tank: through the two biochemical treatment methods of anaerobic and aerobic, the organic matter in the wastewater is further degraded, and at the same time, some nutrients such as nitrogen and phosphorus are removed, and nitrate Chemical liquid return tank: returns part of the effluent from the aerobic tank to the front end of the anaerobic tank, and uses the nitrifying bacteria in it to carry out denitrification to reduce the total nitrogen content in the wastewater. Secondary anaerobic tank and secondary aerobic tank: provide additional biochemical treatment time to ensure that the organic matter and nutrients in the wastewater are more thoroughly removed. First sedimentation tank: removes suspended matter and biological sludge in the wastewater through gravity sedimentation. Fenton reaction tank: uses the strong oxidizing property of Fenton reagent (usually iron ions and hydrogen peroxide) to oxidize and decompose difficult-to-biodegrade organic matter in the wastewater, thereby improving the biodegradability of the wastewater. Flocculation reaction tank and second sedimentation tank: by adding flocculants, the tiny suspended matter and colloidal particles in the wastewater are aggregated into larger flocs, which are then settled by gravity in the second sedimentation tank to further purify the wastewater. A pretreatment tank 8 is set at the front end of the regulating tank. The main purpose of the pretreatment tank 8 is to carry out preliminary physical treatment of livestock and poultry breeding wastewater to prevent debris from clogging or damaging subsequent treatment equipment. The pretreatment device is installed on the guide rails 1 on both sides of the pretreatment tank 8 and can be slidably operated to automatically clean up the debris in the pretreatment tank 8, thereby improving the automation level and operation efficiency of the system. After the debris is cleared in advance, it is not easy to cause pipeline blockage or equipment damage in the subsequent treatment system, thereby improving the treatment efficiency of the system, avoiding the use of manual scooping method for treatment, reducing labor intensity, and saving time and effort.

[0030] Furthermore, the pretreatment device includes a mounting seat 2 and a grid-shaped collecting box 7. The size of the collecting box is adapted to the internal shape and size of the pretreatment tank 8. The mounting seat 2 is slidably arranged on the guide rail 1. A lifting motor 3 is provided on the top surface of the mounting seat 2. The output shaft of the lifting motor 3 is connected to a drum 4. A steel wire rope 6 is wound on the drum 4. The lower end of the steel wire rope 6 passes through the through hole 15 on the mounting seat 2 and is connected to the collecting box 7. A driving motor 9 is provided on the bottom surface of the mounting seat 2 for driving the mounting seat 2 to move along the length direction of the guide rail 1.

[0031] Specifically, such as Figure 2As shown, the mounting base 2 serves as the basic part of the entire pretreatment device. The mounting base 2 is designed to be slidably mounted on the guide rails 1 on both sides of the pretreatment tank 8. The grid-shaped design of the collection box 7 allows water to flow through, while intercepting and collecting debris such as weeds, suspended solids, sand and gravel, and waste. The size of the collection box 7 is adapted to the internal shape and size of the pretreatment tank 8 to ensure that the debris in the tank can be fully covered and cleaned. A lifting motor 3 is provided on the top surface of the mounting base 2. The output shaft of the lifting motor 3 is connected to the drum 4. A wire rope 6 is wound on the drum 4. When the lifting motor 3 is started, the drum 4 can be driven to rotate, thereby controlling the retraction and extension of the wire rope 6, so that the collection box 7 can be raised and lowered. In order to facilitate the lifting of the cleaned debris out of the water, the lower end of the wire rope 6 passes through the through hole 15 on the mounting seat 2 and is connected to the collection box 7. By controlling the retraction and extension of the wire rope 6, precise control of the lifting and lowering of the collection box 7 can be achieved. The driving motor 9 is mounted on the bottom of the mounting seat 2 to drive the mounting seat 2 to move along the length direction of the guide rail 1. When the lifting motor 3 is required to lift the collection box 7 above the pretreatment tank 8, the driving motor 9 can be started to make the mounting seat 2 slide on the guide rail 1, driving the collection box 7 to move to the designated position to clean the debris in the collection box 7. The bottom surface of the mounting seat 2 is provided with a slide groove 14 adapted to the guide rail 1 to ensure that the moving trajectory of the mounting seat 2 is always along the length direction of the guide rail 1.

[0032] The working process of the entire pretreatment device is roughly as follows: first, start the driving motor 9, move the mounting base 2 and the collection cage 7 to the area in the pretreatment tank 8 that needs to be cleaned, then start the lifting motor 3, lower the collection cage 7 into the water, let it intercept and collect debris, after cleaning for a period of time, start the lifting motor 3 again, retract the wire rope 6, and lift the collection cage 7 above the pretreatment tank 8, finally, use the driving motor 9 again to move the collection cage 7 to the designated area to clean and process the debris inside it.

[0033] Furthermore, the collection box 7 is composed of a plurality of mesh panels 701 assembled into a box-like structure with an open top.

[0034] Furthermore, the grid plate 701 on the bottom surface of the collecting box 7 is composed of two symmetrical sub-grid plates 7011, one end of the sub-grid plate 7011 is hinged to the collecting box 7, and the two sub-grid plates 7011 are closed to seal the bottom of the collecting box 7.

[0035] Furthermore, corresponding fixing sleeves 11 are provided on the bottom surfaces of the two sub-grid plates 7011 . Both ends of the fixing sleeves 11 are open. When the bottom of the collecting cage 7 is closed, fixing rods 10 are inserted into the two fixing sleeves 11 .

[0036] Specifically, such as Figure 4As shown, multiple grid plates 701 are combined into a box-type structure with an upper opening. The design of the upper opening facilitates the collection of debris into the grid box while allowing water to pass smoothly without affecting the normal operation of the pretreatment tank 8. The grid plate 701 on the bottom of the collection grid box 7 is composed of two symmetrical sub-grid plates 7011. The bottom grid plate 701 is divided into two symmetrical sub-grid plates 7011. When it is necessary to clean the debris in the collection grid box 7, the sub-grid plate 7011 can be opened to pour out the debris, thereby improving the cleaning efficiency. At the same time, this design also facilitates the maintenance and replacement of the collection grid box 7, extending its service life. One end of the sub-grid plate 7011 is connected to the collection grid box 7. The collection box 7 is hinged, and the hinged design enables the sub-grid plates 7011 to be easily opened and closed, reducing the difficulty and time of operation. The bottom surfaces of the two sub-grid plates 7011 are provided with corresponding fixing sleeves 11, and the fixing sleeves 11 are open at both ends to facilitate the insertion and removal of the fixing rods 10. When the bottom of the collection box 7 is closed, the two fixing sleeves 11 are inserted with fixing rods 10. The function of the fixing rods 10 is to lock the positions of the two sub-grid plates 7011 to ensure that they remain closed during the cleaning process. The fixing rods 10 can be detachable, and the length of the fixing rods 10 can be longer so that they can be easily removed when the sub-grid plates 7011 need to be opened for cleaning.

[0037] Furthermore, the lifting motor 3 is a three-phase asynchronous motor with a built-in braking device.

[0038] Furthermore, the driving motor 9 is a double-headed motor having two output shafts. The double-headed motor is fixed to the bottom surface of the mounting seat 2 and is located between the two guide rails 1. The bottom surface of the guide rail 1 is provided with a plurality of teeth along its length direction. The two output shafts of the double-headed motor are fixed with teeth meshing with the bottom surface of the guide rail 1.

[0039] Specifically, such as Figure 3 As shown, the double-headed motor has two output shafts, which can drive two mechanisms or components to move at the same time. The bottom surface of the guide rail 1 is provided with a number of teeth along its length. These teeth mesh with the gears fixed on the output shaft of the double-headed motor. When the double-headed motor is started, its output shaft will drive the gear to rotate, and then push the mounting seat 2 (i.e. the entire pretreatment device) to slide along the guide rail 1 by meshing with the teeth on the bottom surface of the guide rail 1. Due to the meshing method of the gear or rack with the teeth on the bottom surface of the guide rail 1, this driving method has higher precision and stability. It can ensure that the pretreatment device will not slip or deflect during the movement, thereby ensuring the accuracy and efficiency of the cleaning work. The double-headed motor is fixed to the bottom surface of the mounting seat 2 and is located between the two guide rails 1. This layout makes the entire drive system compact and occupies little space. At the same time, it is also conducive to maintaining the balance and stability of the pretreatment device during movement.

[0040] Furthermore, baffles 13 are provided at both ends of the guide rail 1 for limiting the movement range of the mounting seat 2 .

[0041] Specifically, such as Figure 2 As shown, the main function of the baffle 13 is to limit the range of movement of the mounting base 2 (i.e., the entire pretreatment device) on the guide rail 1. When the mounting base 2 moves to one end of the guide rail 1 and contacts the baffle 13, it will be blocked and stop moving, thereby preventing further movement that may cause collision or equipment damage. In addition to safety, the baffle 13 can also serve as a reference point for the movement of the mounting base 2. By accurately setting the position of the baffle 13, it can be ensured that the mounting base 2 can be accurately positioned at the predetermined position during the movement, thereby improving the accuracy and efficiency of the cleaning work. The design of the baffle 13 is usually relatively simple and can be directly welded or fixed to the end of the guide rail 1. This simple structure is not only easy to manufacture and install, but also reduces costs and maintenance difficulties. The baffle 13 can be adjusted or replaced according to actual needs. For example, if the pretreatment device needs to be moved to a farther distance, the position of the baffle 13 can be adjusted accordingly or a longer guide rail 1 can be replaced.

[0042] Furthermore, a plurality of columns 12 are provided along the length direction of the guide rail 1 , the upper ends of the columns 12 are fixedly connected to the side surfaces of the guide rail 1 , and the lower ends of the guide rail 1 are fixed on the hard ground.

[0043] Specifically, multiple columns 12 are provided along the length of the guide rail 1. Such a layout provides a stable support for the guide rail 1. Multiple columns 12 can disperse the load generated by the guide rail 1 and the pretreatment device during movement, reducing the dependence on a single column 12, thereby improving the stability and durability of the entire system. The upper end of the column 12 is fixedly connected to the side of the guide rail 1. This connection method ensures the stability of the guide rail 1 in the vertical direction. By tightening bolts, welding or other reliable connection methods, the column 12 can firmly support the guide rail 1 to prevent it from shaking or tilting during use, and at the same time avoid the influence of the column 12 on the operation of the drive motor 9. The lower end of the guide rail 1 is fixed to a hard ground surface. The hard ground surface, such as a concrete foundation or a solid ground, can withstand the gravity and other forces transmitted by the guide rail 1 and the pretreatment device, and prevent the guide rail 1 from sinking or shifting during use. The guide rail 1 is usually fixed to the ground using anchor bolts, expansion screws or other professional fixings to ensure a firm connection between the guide rail 1 and the ground. Through the rational layout and fixing method of the columns 12 and the guide rails 1, the entire pretreatment device system can form a stable structure. This structure can not only withstand the various forces and impacts generated by the pretreatment device during movement, but also effectively prevent the impact of external factors (such as wind, rain, earthquakes, etc.) on the system stability. In addition, the design of the columns 12 and guide rails 1 also takes into account the convenience of maintenance and inspection. For example, an inspection platform or ladder can be installed on the columns 12 to enable personnel to easily access the guide rails 1 and pretreatment device for maintenance and inspection.

[0044] Furthermore, there are two UASB reactors, including a primary UASB reactor and a secondary UASB reactor. The primary UASB reactor and the secondary UASB reactor are sequentially arranged between the solid-liquid separator and the pH regulating tank, and a pH regulating tank is provided between the nitrification liquid reflux tank and the secondary anaerobic tank.

[0045] Specifically, the wastewater passes through a solid-liquid separator, which is used to remove large particles, suspended matter and other solid impurities in the wastewater to reduce the load in the subsequent treatment process and improve the treatment efficiency. The wastewater treated by the solid-liquid separator then enters the primary UASB reactor. In the primary UASB reactor, the wastewater is fully in contact with the anaerobic sludge and undergoes a preliminary anaerobic fermentation process. This stage mainly removes organic matter in the wastewater, produces by-products such as biogas, and reduces pollution indicators such as COD (chemical oxygen demand) of the wastewater. Internal reflux pipelines can be set at the outlet ends of the primary UASB and secondary UASB to make the reaction more complete. The wastewater treated by the primary UASB reactor then enters the secondary UA The wastewater is further treated in the UASB reactor. The design and operating parameters of the secondary UASB reactor may be different from those of the primary reactor to adapt to the characteristics and treatment requirements of the wastewater at different stages. In the secondary UASB reactor, the wastewater continues to contact with the anaerobic sludge and undergoes a deeper anaerobic fermentation process. This stage may focus on removing more difficult-to-degrade organic matter or further optimizing the biodegradability of the wastewater. The biodegradability of the wastewater after treatment in the two-stage UASB reactor has been significantly improved, but there may still be some pH imbalance problems. Therefore, a pH adjustment tank is set between the secondary UASB reactor and subsequent treatment units (such as the nitrification liquid return tank). The pool adjusts the pH value of the wastewater by adding acid-base regulators (such as lime, hydrochloric acid, etc.) to reach the optimal range required for subsequent treatment processes. In this wastewater treatment system, the nitrification liquid return pool can also be used to return the nitrate produced during the nitrification process to the primary anaerobic pool for denitrification and denitrification treatment. At the same time, the first sedimentation pool can also return the nitrification liquid and return the nitrate produced during the sedimentation process to the secondary anaerobic pool for denitrification and denitrification treatment again.

[0046] The above description is only a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Based on the technical essence of the present invention and within the spirit and principles of the present invention, any simple modification, equivalent replacement and improvement of the above embodiment shall still fall within the scope of protection of the technical solution of the present invention.

Claims

1. A livestock and poultry breeding wastewater treatment system, characterized in that: The invention comprises a pretreatment tank (8) connected to a drainage outlet of a livestock and poultry farm, wherein the rear end of the pretreatment tank (8) is connected in sequence with a regulating tank, a solid-liquid separator, a UASB reactor, a pH regulating tank, a first-level anaerobic tank, a first-level aerobic tank, a nitrification liquid reflux tank, a second-level anaerobic tank, a second-level aerobic tank, a first sedimentation tank, a Fenton reaction tank, a flocculation reaction tank, and a second sedimentation tank. Columns (12) are provided on both sides of the pretreatment tank (8), and two parallel guide rails (1) are provided on the columns (12). A pretreatment device for removing debris inside the pretreatment tank (8) is slidably provided on the guide rails (1).

2. A livestock and poultry breeding wastewater treatment system according to claim 1, characterized in that: The pretreatment device comprises a mounting seat (2) and a grid-shaped collecting box (7). The size of the collecting box is adapted to the internal shape and size of the pretreatment tank (8). The mounting seat (2) is slidably arranged on the guide rail (1). A lifting motor (3) is provided on the top surface of the mounting seat (2). The output shaft of the lifting motor (3) is connected to a roller (4). A steel wire rope (6) is wound on the roller (4). The lower end of the steel wire rope (6) passes through a through hole (15) on the mounting seat (2) and is connected to the collecting box (7). A driving motor (9) for driving the mounting seat (2) to move along the length direction of the guide rail (1) is provided on the bottom surface of the mounting seat (2).

3. A livestock and poultry breeding wastewater treatment system according to claim 2, characterized in that: The collecting net box (7) is composed of a plurality of mesh panels (701) assembled into a box-like structure with an open top.

4. A livestock and poultry breeding wastewater treatment system according to claim 3, characterized in that: The grid plate (701) on the bottom surface of the collection box (7) is composed of two symmetrical sub-grid plates (7011), one end of each sub-grid plate (7011) is hinged to the collection box (7), and the two sub-grid plates (7011) are closed to seal the bottom of the collection box (7).

5. The livestock and poultry breeding wastewater treatment system according to claim 4, characterized in that: The bottom surfaces of the two sub-grid plates (7011) are provided with corresponding fixing sleeves (11), both ends of the fixing sleeves (11) are open, and when the bottom of the collecting net box (7) is closed, fixing rods (10) are inserted into the two fixing sleeves (11).

6. The livestock and poultry breeding wastewater treatment system according to claim 2, characterized in that: The hoisting motor (3) is a three-phase asynchronous motor with a built-in brake device.

7. The livestock and poultry breeding wastewater treatment system according to claim 2, characterized in that: The driving motor (9) is a double-headed motor having two output shafts. The double-headed motor is fixed to the bottom surface of the mounting seat (2) and is located between the two guide rails (1). The bottom surface of the guide rail (1) is provided with a plurality of teeth along its length direction. Both output shafts of the double-headed motor are fixed with teeth meshing with the bottom surface of the guide rail (1).

8. The livestock and poultry breeding wastewater treatment system according to claim 7, characterized in that: Baffles (13) for limiting the movement range of the mounting seat (2) are provided at both ends of the guide rail (1).

9. The livestock and poultry breeding wastewater treatment system according to claim 1, characterized in that: A plurality of upright posts (12) are provided along the length direction of the guide rail (1); the upper ends of the upright posts (12) are fixedly connected to the side surfaces of the guide rail (1); and the lower ends of the guide rail (1) are fixed to the hard ground.

10. The livestock and poultry breeding wastewater treatment system according to claim 1, characterized in that: There are two UASB reactors, including a primary UASB reactor and a secondary UASB reactor. The primary UASB reactor and the secondary UASB reactor are sequentially arranged between the solid-liquid separator and the pH regulating tank. A pH regulating tank is provided between the nitrification liquid reflux tank and the secondary anaerobic tank.

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