Livestock manure solid-liquid separation of fecal water two-stage biological ribbon processing system

Abstract

A two-stage biological ribbon treatment system for solid-liquid separation of livestock manure, belonging to the field of wastewater treatment technology, includes an equalization tank, a biological treatment tank, a sedimentation tank, and a disinfection tank arranged sequentially. A screen is installed at the top of the equalization tank, with the injection port located above the screen. The biological treatment tank is located downstream of the equalization tank, and a partition wall within the tank divides it into an aerobic zone and an anoxic zone. Microporous aeration heads are arranged at the bottom of the aerobic zone. Vertically arranged braided biological ribbons are evenly distributed in both zones. An overflow weir is installed at the outlet of the biological treatment tank. The sedimentation tank and the disinfection tank are located downstream of the sedimentation tank. This system uses a technical approach combining macroscopic spatial differential aeration in the biological treatment tank with a microscopic biofilm coupling system of the biological ribbons to purify and treat the solid-liquid separated livestock manure. It eliminates the need for nitrification liquid recirculation, simplifies the process, reduces the footprint, lowers operating costs, and efficiently removes nitrogen and carbon, achieving compliant discharge of manure. It is suitable for manure treatment in small and medium-sized livestock farms.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment technology, specifically to a two-stage biological ribbon treatment system for solid-liquid separation of livestock manure. Background Technology

[0002] With the rapid development of my country's livestock farming industry, the increasing amount of livestock manure has attracted widespread social attention. If not disposed of scientifically and rationally, it will not only gradually encroach on land resources but also cause severe environmental pollution and ecological damage. Therefore, based on the characteristics of livestock manure and the basic principles of solid waste reduction, harmlessness, and resource utilization, livestock manure from livestock farms must undergo solid-liquid separation. The separated solid matter can be reused as a resource, while the separated wastewater is usually used for direct dilution and return to the fields, anaerobic fermentation to produce biogas, or purification to meet discharge standards. Existing conventional purification technologies mainly include anaerobic-aerobic biochemical treatment measures and artificial ecological purification measures. Currently, due to operational costs and limited production space, small and medium-sized livestock farms in my country mainly adopt the method of diluting and returning manure to the fields for solid-liquid separation. However, in livestock farms that do not have the conditions for returning manure to the fields, it is necessary to purify the manure. Only after the treatment meets the standards stipulated in the National Standard for Pollutant Discharge from Livestock and Poultry Farming (GB18596-2001) can it be discharged to the public. Among the available treatment methods, conventional anaerobic and aerobic biochemical treatment measures can stably meet the standards, but the investment and operation and maintenance costs are too high. Artificial ecological purification measures have the advantages of low cost and easy maintenance, but they occupy too much land, have poor purification effect in winter, and have low load. Neither of these methods can fully and effectively adapt to the economic, technical and environmental conditions of small and medium-sized livestock farms, resulting in a heavy cost burden and restricting the development of livestock farm scale and the improvement of efficiency. Therefore, it is necessary to study and develop a method and supporting system for the purification of manure after solid-liquid separation in livestock farms, based on the composition characteristics of the manure, to reduce the supporting costs of livestock farms, meet the environmental conditions of livestock farms, achieve compliant discharge of manure, and solve existing technical problems. Utility Model Content

[0003] The purpose of this invention is to provide a two-stage biological ribbon treatment system for solid-liquid separation of livestock manure. This system uses a technical approach that combines differentiated aeration in the macroscopic space of the biochemical tank with a biofilm coupling system in the microscopic region of the biological ribbon to purify and treat solid-liquid separated manure. This simplifies the treatment process, reduces operation and maintenance costs, minimizes the footprint, achieves compliant discharge, and meets the production adaptation requirements of livestock farms.

[0004] A two-stage biological ribbon treatment system for solid-liquid separation of livestock manure includes: an equalization tank, a biological treatment tank, a sedimentation tank, and a disinfection tank, arranged sequentially. The equalization tank receives solid-liquid separated manure from livestock manure. A screen is installed above the inlet of the manure, and the injection port of the manure is located above the screen. The injected manure is pre-filtered by the screen to remove fine suspended solids, hair, and impurities. The biological treatment tank is located relative to the flow direction of the manure. The downstream end of the equalization tank is connected to the equalization tank via a connecting corridor. The sewage flows from the equalization tank into the biological treatment tank through the connecting corridor. A partition wall is installed within the biological treatment tank, dividing its internal space into two interconnected spatial regions along the sewage flow direction. The upper end of the partition wall is higher than the sewage surface, blocking floating debris. A connecting pipe is installed on the wall connecting the two spatial regions. The downstream spatial region is the aerobic zone, and the upstream... The aerobic zone is an anoxic zone. Microporous aeration heads are evenly distributed at the bottom of the aerobic zone. Vertically arranged braided biological ribbons are placed in both the aerobic and anoxic zones. These braided biological ribbons are flexible woven biofilm carriers mimicking the form of natural aquatic plants, used to attach and grow aerobic and anaerobic biofilm sludge, respectively. Both ends of the braided biological ribbons are tied to suspension ropes. The upper ends of the suspension ropes are connected to a structural frame positioned above the sewage surface, and the lower ends are suspended by weights to ensure the braided biological ribbons remain within the designated area. The aerobic zone and the anoxic zone are arranged in a matrix pattern on the horizontal plane. An overflow weir is installed at the outflow end of the biological treatment tank, which limits the height H1 of the water surface in the biological treatment tank relative to the ground and distributes the overflow evenly. The sedimentation tank is located downstream of the biological treatment tank and receives the sewage overflowing from the biological treatment tank. The sewage in the sedimentation tank settles the detached biofilm and suspended particulate matter. The disinfection tank is located downstream of the sedimentation tank and disinfects the sewage before final discharge to achieve compliant discharge.

[0005] The two-stage biological ribbon treatment system for solid-liquid separation of livestock manure and wastewater preferably comprises a braided biological ribbon composed of a structural core tube and adsorption loops. The structural core tube is a hollow, flexible sleeve woven from flexible fiber filaments, possessing high strength, good flexibility, and corrosion resistance. The adsorption loops consist of hydrophilic flexible filaments attached to the outer circumference of the structural core tube. These flexible filaments are radially and densely distributed on the outer circumference of the structural core tube, forming a high specific surface area micro-loop layer that surrounds the outside of the structural core tube, providing ample carrier space for microbial attachment and biofilm formation. In the anoxic zone, a large number of anaerobic microorganisms can attach to the surface of the braided biological ribbon to form anaerobic biofilm sludge, with minimal sludge loss and a sufficient and stable anaerobic bacterial community, maintaining continuous hydrolysis, acidification, and anaerobic reactions without sludge recirculation. In the aerobic zone, the microporous aeration heads continuously aerate the... The wastewater maintains a high dissolved oxygen environment, allowing aerobic microorganisms to proliferate and stably attach to the outer surface of the braided biological ribbon, forming an aerobic biofilm sludge. This aerobic biofilm sludge effectively decomposes organic matter, reduces COD, and performs nitrification. Simultaneously, due to the locally anoxic microenvironment inside the core tube, anaerobic and facultative anaerobic microorganisms can also attach and grow on the inner surface of the core tube, forming anaerobic and facultative anaerobic biofilms. This creates a composite biofilm coupling system with an outer aerobic layer, an inner anaerobic layer, and a middle transitional facultative anaerobic layer. The inner anaerobic microorganisms can perform denitrification, reducing nitrate nitrogen produced by aerobic nitrification to nitrogen gas, thus improving total nitrogen removal. They can also anaerobically decompose large, recalcitrant organic molecules that are difficult for aerobic microorganisms to break down, further reducing COD and preventing clogging and sludge aging in the braided biological ribbon, ensuring the stability of the composite biofilm microbial community structure.

[0006] The two-stage biological ribbon treatment system for solid-liquid separation of livestock manure and wastewater preferably includes a horizontally arranged connecting corridor at the lower part of the equalization tank and the biochemical tank, and a connecting pipe located at the lower part of the partition wall. An upper guide plate and a lower guide plate are installed in the equalization tank, and a flow-blocking partition wall is installed in the biochemical tank. The upper end of the upper guide plate extends above the manure water surface and is fixedly connected to the extension end of the grid into the equalization tank. The plate is inclinedly arranged at the lower part of the grid, and both sides of the plate are respectively connected to the equalization tank... The two side walls of the regulating tank are connected accordingly, and the lower end of the regulating tank maintains a gap distance from the inlet end wall of the regulating tank to form a return port. The lower guide plate and the upper guide plate are arranged parallel to each other and correspondingly on the lower part of the upper guide plate. Together with the upper guide plate, they form the guide channel for the sewage. The return port is the lower port of the guide channel. The upper port of the guide channel is located on the upper part of the regulating tank, so that the sewage injected by the injection pipe is first blocked and stabilized by the upper guide plate, then guided by the guide channel, and finally flows as water. The wastewater enters the regulating tank in a balanced and stable laminar flow state. The flow-blocking wall is located outside the connecting corridor, with its upper end submerged below the water surface and its lower end horizontally blocking the cross-section of the biological treatment tank. The flow-blocking wall guides the wastewater flowing in from the connecting corridor to a higher position on the upper part of the wall before entering the biological treatment tank. It also prevents the wastewater flowing in from a point source from causing turbulent impacts on the biological treatment tank, allowing the wastewater to flow in a meandering manner and stabilize its flow state. The wastewater flows in a balanced laminar flow state on the upper part of the flow-blocking wall. The wastewater enters the biological treatment tank in a stable flow state, ensuring the stability of the flow pattern. Simultaneously, by using the upper and lower guide plates to limit the inflow height of the wastewater in the equalization tank, and by using the flow-blocking walls to adjust the inflow height of the wastewater in the anoxic zone of the biological treatment tank, a significant elevation difference is created between the inflow and outflow levels in both the equalization tank and the anoxic and aerobic zones of the biological treatment tank. This prevents direct runaway of the wastewater, promotes water quality homogenization, and buffers concentration loads.

[0007] The two-stage biological ribbon treatment system for solid-liquid separation of livestock manure is preferably configured with multiple horizontally evenly distributed connecting pipes at the lower part of the partition wall to eliminate turbulent flow that may occur on both sides of the partition wall. This allows the manure to flow from the anoxic zone to the aerobic zone in a balanced and stable flow state, ensuring the stability of the liquid flow state in the biological treatment tank.

[0008] The two-stage biological ribbon treatment system for solid-liquid separation of livestock manure preferably also includes microporous aeration heads at the bottom of the anoxic zone. The density of the microporous aeration heads in the anoxic zone is lower than that in the aerobic zone. While ensuring that the anoxic zone maintains an anaerobic environment, the microporous aeration heads intermittently aerate and disturb the bottom water, preventing sludge from settling at the bottom and promoting the sludge to fully adhere to the braided biological ribbon. This stabilizes the anoxic environment in the anoxic zone, improves denitrification efficiency, and prevents secondary release of nitrogen and phosphorus.

[0009] The two-stage biological sludge treatment system for solid-liquid separation of livestock manure preferably has scum guide ports on the inner side walls of the regulating tank outlet end wall and on the side walls of the biochemical tank on the anoxic zone side of the partition wall. A guide valve is installed on each scum guide port. The guide valve can be used to control the discharge of the floating matter blocked in the regulating tank and the anoxic zone, thereby eliminating odor and reducing the load on subsequent purification treatment.

[0010] The two-stage biological ribbon treatment system for solid-liquid separation of livestock manure preferably includes a collection well between the sedimentation tank and the biochemical tank. This collection well collects the manure, stabilizes the water flow, and balances the water quality. The collection well is positioned corresponding to the biochemical tank and can receive the manure overflowing from the biochemical tank. Simultaneously, the collection well and the sedimentation tank are interconnected via an inclined flow channel. The inlet of the inclined flow channel is submerged below the manure surface defined by the sedimentation tank, allowing water from the collection well to flow naturally into the sedimentation tank in a horizontal, submerged manner. This avoids surging currents that disturb the bottom of the sedimentation tank, causing sediment to rise or aeration to foam, thus ensuring the sedimentation and purification effect of the sedimentation tank.

[0011] The two-stage biological ribbon treatment system for solid-liquid separation of livestock manure further includes an ecological oxidation pond, which is located between the sedimentation tank and the disinfection tank to further purify the manure discharged from the sedimentation tank. The manure is then disinfected in the disinfection tank, providing a more reliable guarantee for achieving compliant discharge.

[0012] The beneficial effects of this utility model are that it provides a two-stage biological ribbon treatment system for solid-liquid separation of livestock manure. It employs a biochemical tank with a two-stage series structure consisting of anoxic and aerobic zones. Braided biological ribbons serve as the attachment carrier for microbial sludge, utilizing their large specific surface area, high activated sludge attachment capacity, and strong adsorption. In the anoxic zone, the abundant carbon source in the manure itself directly facilitates a thorough denitrification reaction, while in the aerobic zone, nitrification occurs, converting ammonia nitrogen into nitrate nitrogen. Simultaneously, the braided biological ribbons utilize their own layered coupling structure of aerobic, facultative, and anoxic microbial biofilms from the outside in, ensuring efficient nitrification in the aerobic layer. The generated nitrate nitrogen can be reduced to ammonia gas through denitrification in the anoxic layer and released. In addition, the microbial sludge biofilm on the braided biological ribbon in the anoxic zone is abundant and stable. Therefore, by utilizing the synergistic effect of the sequential operation of the anoxic and aerobic zones in the biological treatment tank, the denitrification of the manure can be directly achieved without the need for internal reflux devices for nitrification liquid and sludge in the system. This simplifies the design structure of the livestock manure solid-liquid separation and manure purification system and the manure purification process. When applied to livestock farms, it can reduce the land occupation area, lower construction and operation and maintenance costs, ensure the purification effect of manure, and achieve compliant discharge. Attached Figure Description

[0013] Figure 1 The main view of the regulating tank structure in a two-stage biological ribbon treatment system for solid-liquid separation of livestock manure.

[0014] Figure 2 The main view of the biochemical tank and the collection tank in a two-stage biological ribbon treatment system for solid-liquid separation of livestock manure.

[0015] Figure 3 for Figure 2 Enlarged view of section I in the middle.

[0016] Figure 4 A top view of the biochemical tank and water collection tank in a two-stage biological ribbon treatment system for solid-liquid separation of livestock manure.

[0017] Figure 5 Main view of the sedimentation tank and collection well structure in a two-stage biological ribbon treatment system for solid-liquid separation of livestock manure.

[0018] Among them: 1 is the bar screen, 2 is the liquid injection port, 3 is the scum guide port, 4 is the connecting corridor, 5 is the partition wall, 6 is the connecting pipe, 7 is the braided biological ribbon, 8 is the overflow weir of the biological treatment tank, 9 is the microporous aeration head, 10 is the regulating tank, 11 is the structural core tube, 12 is the adsorption ring, 13 is the upper guide plate, 14 is the lower guide plate, 15 is the flow-blocking partition wall, 16 is the flow-limiting gate, 17 is the oblique flow channel, 18 is the guide valve, 19 is the water collection well, 20 is the biological treatment tank, 21 is the sedimentation tank, 22 is the flow stabilization space, 23 is the structural frame, 24 is the counterweight stone, 25 is the oblique tube assembly, 26 is the overflow weir of the sedimentation tank, 27 is the scum guide port, and 28 is the suspension rope. Detailed Implementation

[0019] Furthermore, the technical solution for which protection is sought in this utility model will be described in detail below with reference to specific embodiments and accompanying drawings.

[0020] A two-stage biological ribbon treatment system for solid-liquid separation of livestock manure and wastewater, such as Figures 1 to 5 As shown, the structure consists of an equalization tank 10, a biochemical tank 20, a collection well 19, a sedimentation tank 21, an ecological oxidation pond, and a disinfection tank arranged in sequence. The equalization tank 10, the biochemical tank 20, the collection well 19, the sedimentation tank 21, and the disinfection tank are all rectangular reinforced concrete structures that are semi-submerged underground. The livestock manure solid-liquid separation manure flows smoothly and evenly from the equalization tank 10 towards the disinfection tank in the order of arrangement by gravity self-propelled flow, ensuring the hydraulic residence time of the manure in the equalization tank 10, the biochemical tank 20, and the sedimentation tank 21.

[0021] In the regulating tank 10, a grid 1 is fixedly installed at the inlet end relative to the flow direction of the sewage. The grid 1 is horizontally positioned above the sewage surface. The injection port 2 of the solid-liquid separation sewage conveying pipeline is located at the upper part of the grid 1. A flow stabilizing mechanism is provided at the lower part of the grid 1. The flow stabilizing mechanism consists of an upper guide plate 13 and a lower guide plate 14 arranged parallel and inclined to each other. The upper end of the upper guide plate 13 protrudes above the sewage surface and is fixedly connected to the front end of the grid 1. Both sides are connected to the side walls of the regulating tank 10, respectively, thus separating a flow stabilizing space 22 for the sewage in the regulating tank 10, preventing the sewage from flowing directly downstream. The lower end is connected to the end wall of the regulating tank 10. A return port is formed by a spaced interval. The lower guide plate 14 is correspondingly set at the lower part of the upper guide plate 13, and cooperates with the upper guide plate 13 to form a guide channel. A horizontal guide end is provided at the upper end. The guide channel can guide the sewage in the stabilizing space 22 from the return port to the upper end of the lower guide plate 14 and flow into the regulating tank 10 in a horizontal laminar flow state at the upper end of the lower guide plate 14. Scum guide ports 3 are respectively opened on the side walls on both sides of the inner side of the outlet end wall of the regulating tank 10 and on both sides of the upstream side of the upper guide plate 13. A guide valve 18 is installed on the scum guide port 3 to control the discharge of floating objects floating on the surface of the sewage.

[0022] The biological treatment tank 20 is connected to the regulating tank 10 via a connecting corridor 4. A partition wall 5 is installed within the biological treatment tank 20, dividing it into two equal spaces. Relative to the flow direction of the sewage, the downstream area is the aerobic zone, and the upstream area is the anoxic zone. Four connecting pipes 6 are evenly distributed at the same horizontal level at the lower part of the partition wall 5, connecting the aerobic and anoxic zones. Scum guide ports 3 are respectively opened on the side walls of the biological treatment tank 20 on the anoxic zone side of the partition wall 5, and corresponding guide valves 18 are installed on each scum guide port 3. Microporous aeration heads 9 are evenly distributed at the bottom of both the aerobic and anoxic zones. The microporous aeration heads 9 are arranged at a lower density in the anoxic zone than in the aerobic zone. A structural frame 23 for suspending the braided biological ribbon 7 is fixedly installed at the upper end of the biological tank 20. The braided biological ribbon 7 is a composite structure of a structural core tube 11 and an adsorption loop 12. The structural core tube 11 is a hollow flexible sleeve, and the adsorption loop 12 is attached to the outside of the structural core tube 11. Suspension ropes 28 are distributed and connected on the structural frame 23. The lower end of the suspension rope 28 is connected to a counterweight 24 to keep the suspension rope 28 suspended. The suspension ropes 28 pass through the central cavity of the structural core tube 11, thus fitting the braided biological ribbon 7 as a whole. Outside the suspension rope 28, the braided biological ribbons 7 are vertically arranged along the suspension rope 28 in a stretched-out form. The upper and lower ends are respectively tied and secured to the suspension rope 28, sealing the central inner hole of the structural core tube 11. This allows the braided biological ribbons 7 to be vertically suspended from the structural frame 23 by the suspension rope 28 and arranged in a square array corresponding to the aerobic and anoxic zones, respectively. The entire ribbons are submerged in the sewage. In the aerobic zone, the braided biological ribbons 7 naturally form a composite biofilm coupling distribution system with an outer aerobic layer, an inner anaerobic layer, and an intermediate facultative anaerobic transition layer. In the anoxic zone, a flow-blocking partition 15 is installed on the outer side of the connecting corridor 4. The flow-blocking partition 15 is vertically arranged, with its upper end submerged. Below the surface of the sewage, a wall horizontally blocks the cross-section of the biological treatment tank 20, preventing the sewage from flowing directly into the connecting corridor 4. Instead, the sewage is guided to a higher position above the flow-blocking partition wall 15 before entering the biological treatment tank 20. Simultaneously, a flow-limiting gate 16 is installed at the inlet of the connecting corridor 4 to adjust and control the flow rate of sewage from the regulating tank 10 into the biological treatment tank 20. An overflow weir 8 is installed at the outlet of the biological treatment tank 20. The overflow weir 8 is a triangular overflow weir, which evenly distributes water to ensure a smooth overflow of sewage and limits the height H1 of the horizontal plane in the biological treatment tank 20 and the regulating tank 10 relative to the ground.

[0023] The collection well 19 receives the sewage overflowing from the biological treatment tank 20. A smooth guide slope is provided between the biological treatment tank 20 and the collection well 19, allowing the sewage to flow naturally into the collection well 19. The slope of the guide slope is limited to less than 1:2 to maintain a uniform and horizontal flow of the sewage. An oblique flow channel 17 is provided between the collection well 19 and the sedimentation tank 21. The inlet of the oblique flow channel 17 is submerged below the water surface in the sedimentation tank 21 and the collection well 19. The height of the water surface in the sedimentation tank 21 and the collection well 19 relative to the ground is H3, so that the sewage in the collection well 19 is guided and discharged into the sedimentation tank 21 in a horizontal and submerged manner.

[0024] The sedimentation tank 21 is an inclined tube sedimentation tank. An overflow weir 26 is provided at the outlet end of the sedimentation tank 21. The overflow weir 26 is a triangular overflow weir, which can limit the height H2 of the sewage water surface in the sedimentation tank 21 and the collection well 19 relative to the ground. The flow restriction height of the overflow weir 26 is lower than the flow restriction height of the biological treatment tank overflow weir 8. The sewage water is introduced into the sedimentation tank 21 through the collection well 19. An inclined tube assembly 25 is installed inside the sedimentation tank. The lower end is provided with a sludge discharge port 27 connected to the discharge pipe to clean and discharge the sludge sediment deposited at the bottom of the sedimentation tank 21. After sedimentation treatment, the sewage water overflows from the overflow weir 26 and flows naturally into the ecological oxidation pond and the disinfection pond in sequence. It can be further purified in the ecological oxidation pond through ecological treatment and discharged after disinfection treatment in the disinfection pond.

[0025] The operation method and working principle of the two-stage biological ribbon treatment system for solid-liquid separation of livestock manure in this embodiment are as follows: Under stable operating conditions, the manure collected after solid-liquid separation treatment is transported through pipelines and continuously injected into the equalization tank 10 through the injection port 2. During the injection process, the fine suspended solids, hair, and other particulate matter mixed in the manure are filtered out by the screen 1. The equalization tank 10, the biological treatment tank 20, the collection well 19, and the sedimentation tank 21 are kept full of water. The water level in the equalization tank 10 and the biological treatment tank 20 is determined by the following parameters: The overflow weir 8 of the biological treatment tank limits the water level of the collection well 19 and the sedimentation tank 21, while the overflow weir 26 of the sedimentation tank limits the flow. The flow restriction height of the sedimentation tank overflow weir 26 is lower than that of the overflow weir 8 of the biological treatment tank. The flow rate of the sewage injection into the injection pipe 2 and the flow rate of the connecting corridor 4 are adjusted accordingly, so that the sewage flows from the regulating tank 10 to the sedimentation tank 30 by gravity flow, maintaining a hydraulic retention time of 12-16 hours in the regulating tank 10 and a hydraulic retention time of 30-36 hours in the biological treatment tank 20. The sedimentation tank 21 maintains a hydraulic retention time of 3-4 hours; in the equalization tank 10, the injected sewage, through the flow stabilization mechanism, does not disrupt the balanced and stable flow state of the sewage. In the equalization tank 10, the solute fully diffuses and mixes to achieve homogeneity and equal quantity, thus achieving pollution load equalization; then, the sewage first enters the anoxic zone of the biological treatment tank 20 through the connecting corridor 4. In the anoxic zone, intermittent aeration is achieved using microporous aeration heads 9 installed within the zone, controlling the dissolved oxygen content of the sewage within the zone to the range of 0.3-0.8 mg / L. The surface of the braided biological ribbon 7 in the anoxic zone is covered with a large amount of anaerobic microbial film sludge. The sewage can complete denitrification using its own carbon source. Since the anaerobic microbial film sludge is firmly and stably attached to the braided biological ribbon 7 and the amount of sludge is sufficient, there is no need to replenish the anaerobic microorganisms with sludge return during the denitrification process. Subsequently, the sewage enters the aerobic zone of the biological treatment tank 20 through the connecting pipe 6. In the aerobic zone, the microporous aeration heads 9 installed in the area continuously aerate the sewage, controlling the dissolved oxygen content in the sewage in the area to be between 2.0 and 2.Within the 5 mg / L range, due to the presence of a large amount of aerobic microbial film sludge on the outer surface of the braided biological ribbon 7 in the aerobic zone, and the presence of anaerobic microbial film on the inner surface, the anaerobic microbial film can form a coupled distribution system with the external aerobic microbial film. This allows the organic matter in the sewage to be fully decomposed on the outside of the braided biological ribbon 7, reducing COD and nitrifying. Simultaneously, denitrification occurs inside the braided biological ribbon 7, reducing the nitrate nitrogen produced by external nitrification to nitrogen gas, increasing the total nitrogen removal rate, and further anaerobicly decomposing the macromolecules in the sewage. The wastewater, after biochemical treatment, overflows from the biochemical tank 20, collects and stabilizes the water flow and quality through the collection well 19, and then flows into the sedimentation tank 21 via a submerged inflow method. This stabilizes the inflow of the wastewater and ensures effective sedimentation. After sedimentation, the wastewater continues to overflow from the front end of the sedimentation tank 21, and then undergoes further deep purification treatment in an ecological oxidation pond and disinfection treatment in a disinfection pond to meet the standards stipulated in the National Standard for Pollutant Discharge from Livestock and Poultry Farming (GB18596-2001), achieving compliant discharge.

[0026] This embodiment describes a two-stage biological ribbon treatment system for solid-liquid separation of livestock manure. It employs a technical approach combining differentiated aeration in the macroscopic space of the biochemical tank with a biofilm coupling system in the microscopic region of the biological ribbon to purify the solid-liquid separated livestock manure. This system significantly improves upon existing livestock manure purification processes, which are complex, require large land areas, have high energy consumption, and incur high construction and maintenance costs. It fully guarantees the purification effect of solid-liquid separated livestock manure and is suitable for widespread application in various small and medium-sized livestock farms. It provides a new technological approach and method for treating livestock manure in farms lacking the conditions for returning it to the fields.

Claims

1. A two-stage biological bio-belt treatment system for separating solid and liquid manure from livestock manure, characterized in that, include: The regulating tank (10), the biochemical tank (20), the sedimentation tank (21) and the disinfection tank are arranged in sequence. The regulating tank (10), the biochemical tank (20), the sedimentation tank (21) and the disinfection tank are arranged in sequence. The regulating tank (10) receives solid-liquid separation manure from livestock manure. A grid (1) is provided at the upper part of the inlet end of the manure injection. The injection port (2) of the manure injection is located at the upper part of the grid (1). Relative to the flow direction of the sewage, the biological treatment tank (20) is located downstream of the regulating tank (10) and is interconnected with the regulating tank (10) via a connecting corridor (4). A partition wall (5) is provided inside the biological treatment tank (20), which divides the internal space of the biological treatment tank (20) into two interconnected spatial areas along the flow direction of the sewage. The upper end of the partition wall (5) is higher than the surface of the sewage, and a connecting pipe (6) is provided on the wall to connect the two spatial areas. The spatial area at the downstream end is the aerobic zone, and the one at the upstream end is the anoxic zone. Microporous aeration heads (9) are evenly distributed at the bottom of the aerobic zone. Vertically arranged braided biological ribbons (7) are arranged in the aerobic zone and the anoxic zone, respectively. The braided biological ribbons (7) are flexible braids that simulate the shape of natural aquatic plants. The structured biofilm carrier has two ends of the braided biological ribbon (7) tied to the suspension rope (28) respectively. The upper end of the suspension rope (28) is connected to the structural frame (23) set above the fecal water surface, and the lower end is suspended by counterweight, so that the braided biological ribbon (7) is arranged in a matrix in the horizontal plane of the aerobic zone and the anoxic zone respectively. An overflow weir (8) is installed at the outlet end of the biological tank (20). The overflow weir (8) limits the height H1 of the water surface in the biological tank (20) relative to the ground, and at the same time distributes the overflow water evenly. The sedimentation tank (21) is set downstream of the biological tank (20) to receive the fecal water overflowing from the biological tank (20). The disinfection tank is set downstream of the sedimentation tank (21) to disinfect the fecal water.

2. The two-stage biological bio-belt treatment system for separating solid and liquid of livestock manure and manure water according to claim 1, characterized in that: The braided bio-ribbon (7) is composed of a structural core tube (11) and an adsorption loop (12). The structural core tube (11) is a hollow flexible sleeve woven from flexible fiber filaments. The adsorption loop (12) is composed of hydrophilic flexible filaments attached to the outer circumferential surface of the structural core tube (11). The flexible filaments are radially and densely distributed on the outer circumferential surface of the structural core tube (11) to form a high specific surface area micro loop layer that surrounds and covers the outside of the structural core tube (11).

3. The two-stage biological bio-belt treatment system for separating solid and liquid of livestock manure and manure water according to claim 2, characterized in that: The connecting corridor (4) is horizontally arranged at the lower part of the regulating tank (10) and the biochemical tank (20), and the connecting pipe (6) is arranged at the lower part of the partition wall (5). At the same time, an upper guide plate (13) and a lower guide plate (14) are arranged in the regulating tank (10), and a flow-blocking partition wall (15) is arranged in the biochemical tank (20). The upper end of the upper guide plate (13) is higher than the sewage water surface and is fixedly connected to the extension end of the grid (1) into the regulating tank (10). The plate is inclinedly arranged at the lower part of the grid (1), and the two sides of the plate are respectively connected to the two side walls of the regulating tank (10). Corresponding connection, the lower end is spaced apart from the inlet end wall of the regulating tank (10) to form a return port. The lower guide plate (14) and the upper guide plate (13) are parallel to each other and are correspondingly arranged at the lower part of the upper guide plate (13). Together with the upper guide plate (13), they form the guide channel for the sewage. The return port is the lower port of the guide channel. The upper port of the guide channel is located at the upper part of the regulating tank (10). The flow-blocking partition wall (15) is located on the outside of the connecting corridor (4). The upper end is submerged below the water surface, and the lower end is bottomed out and horizontally blocks the cross section of the biochemical tank (20).

4. The two-stage biological bio-belt treatment system for separating solid and liquid of livestock manure and manure water according to claim 3, characterized in that: The connecting pipes (6) are arranged in multiple horizontally and evenly distributed sections at the bottom of the partition wall (5).

5. The two-stage biological bio-belt treatment system for separating solid and liquid of livestock manure and manure water according to claim 4, characterized in that: The microporous aeration heads (9) are also arranged at the bottom of the anoxic zone. The arrangement density of the microporous aeration heads (9) in the anoxic zone is less than that in the aerobic zone.

6. The two-stage biological bio-belt treatment system for separating solid and liquid of livestock manure and manure water according to claim 5, characterized in that: Scum guide ports (3) are provided on the inner side walls of the outlet end wall of the regulating tank (10) and on the side walls of the biochemical tank (20) on the anoxic zone side of the partition wall (5). Drainage valves (18) are installed on the scum guide ports (3).

7. A two-stage biological ribbon treatment system for solid-liquid separation of livestock manure and wastewater as described in any one of claims 1 to 6, characterized in that: A water collection well (19) is provided between the sedimentation tank (21) and the biochemical tank (20). The water collection well (19) is provided corresponding to the biochemical tank (20) and can receive the sewage overflowing from the biochemical tank (20). At the same time, the water collection well (19) and the sedimentation tank (21) are connected to each other through an inclined flow channel (17). The inlet of the inclined flow channel (17) is submerged below the sewage water surface defined by the sedimentation tank (21).

8. The two-stage biological bio-belt treatment system for separating solid and liquid of livestock manure and manure water according to claim 7, characterized in that, Also includes: An ecological oxidation pond is located between the sedimentation tank (21) and the disinfection tank.

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