SS treatment system suitable for wet garbage anaerobic fermentation biogas slurry

Abstract

The invention discloses an SS treatment system suitable for wet garbage anaerobic fermentation biogas slurry, and relates to the technical field of biogas slurry treatment, the SS treatment system comprises an integrated reaction tank and a solid-liquid separator; the interior of the integrated reaction tank is divided into a dosing area I, a dosing area II, a dosing area III and a separation area which are communicated in sequence; the three independent dosing areas are arranged in the integrated reaction tank, different chemicals are sequentially added, the synergistic effect of the chemicals can be fully played, suspended solids in the biogas slurry are efficiently gathered and float upwards, solid-liquid separation is achieved, the suspended solids in the biogas slurry are effectively removed, the viscosity is low, high-quality inlet water is provided for the subsequent sewage treatment process, and the sewage treatment efficiency is improved. The wet garbage anaerobic fermentation biogas slurry treatment system guarantees the effect and efficiency of subsequent biochemical treatment and membrane treatment, not only improves the treatment effect of wet garbage anaerobic fermentation biogas slurry, but also is small in occupied area and convenient to install, reduces the operation cost, improves the treatment efficiency, enhances the overall performance and market competitiveness of the system, and has good economic benefits and environmental benefits.

Description

Technical Field

[0001] The present invention relates to the technical field of biogas slurry treatment, and in particular to an SS treatment system suitable for anaerobic fermentation of wet garbage biogas slurry. Background Art

[0002] Currently, the primary process used for wet garbage treatment in my country is "pretreatment + wet anaerobic digestion." Under this process, the biogas slurry produced after anaerobic fermentation of wet garbage contains extremely high levels of suspended solids (SS), typically around 20,000 mg / L. Such high levels of SS can severely impact subsequent treatment processes. On the one hand, they hinder the reproduction and growth of bacteria in the biochemical system, thereby reducing biochemical treatment efficiency. On the other hand, they significantly impact membrane efficiency, increasing the risk of membrane clogging, significantly shortening membrane life, and increasing treatment costs.

[0003] To ensure the normal and efficient operation of subsequent sewage treatment systems, the effluent from anaerobic digestion must be pretreated to meet the system's inlet requirements. Currently, the commonly used suspended solids treatment technology is "dosing + centrifugation." This involves adding PAM (polyacrylamide) before the solid-liquid separator to leverage its properties to enhance flocculation, followed by solid-liquid separation. However, practice has shown that even with this process, the separated biogas slurry still has a high SS content of approximately 5000 mg / L and a high viscosity. High biogas viscosity not only complicates subsequent biochemical treatment, hindering the biochemical reaction, but also hinders resource utilization, significantly limiting the overall effectiveness and benefits of anaerobic digestion treatment of wet garbage. Therefore, there is an urgent need to develop a new treatment system to address these challenges in existing technologies. Summary of the Invention

[0004] The purpose of the present invention is to solve the problems of low SS removal efficiency and high effluent viscosity in the existing wet garbage anaerobic fermentation biogas slurry, and to propose an SS treatment system suitable for wet garbage anaerobic fermentation biogas slurry.

[0005] In order to achieve the above-mentioned object, the present invention adopts the following technologies: a SS treatment system suitable for anaerobic fermentation of wet garbage biogas slurry, comprising an integrated reaction tank and a solid-liquid separator; The interior of the integrated reaction tank is divided into a dosing area 1, a dosing area 2, a dosing area 3, and a separation area which are connected in sequence, and a slag storage area and a clear liquid area which are connected to the top and bottom of the separation area respectively; The dosing area 1, dosing area 2, and dosing area 3 are respectively provided with a reagent dosing device for sequentially adding a dispersant, a coagulant accelerator, and a sedimentation enhancer to the corresponding dosing area to promote the aggregation and floating of suspended matter in the biogas slurry; A scraper is provided on the top of the separation zone to scrape the floating slag to the slag storage area; the clear liquid at the bottom of the separation zone flows into the clear liquid area; The slag storage area is connected to the solid-liquid separator to transport the slag to the solid-liquid separator for solid-liquid separation; the supernatant after separation by the solid-liquid separator flows back to the water inlet end of the integrated reaction tank, and the sludge enters the sludge treatment system.

[0006] Furthermore, the dosing area 1, dosing area 2, and dosing area 3 are respectively provided with a stirring device, and the stirring device is driven by a motor to fully mix the agent with the biogas slurry; The stirring device is driven by a variable frequency motor, and the stirring speed is adjusted in real time according to the flow rate, concentration and amount of reagent added of the biogas slurry. The stirring blade adopts a pitched blade turbine structure, which can generate an axial and radial composite flow field during the stirring process, which not only accelerates the diffusion speed of the reagent in the biogas slurry, but also promotes full contact between the suspended matter and the reagent.

[0007] Furthermore, the dosing area 1, the dosing area 2, the dosing area 3 and the adjacent areas all flow by gravity through connecting holes.

[0008] Furthermore, a screw pump is installed on the sludge conveying pipeline at the bottom of the slag storage area to quantitatively convey the sludge to the solid-liquid separator.

[0009] Furthermore, the dispersant dosing device, the coagulant accelerator dosing device and the precipitation enhancer dosing device are all metering pumps, and the metering pumps are equipped with high-precision flow sensors and PLC control systems.

[0010] A SS treatment method for anaerobic fermentation of wet garbage biogas slurry comprises the following steps: The anaerobic fermentation liquid of wet garbage is introduced into the dosing area 1 of the integrated reaction tank, and a dispersant is added in the dosing area 1 according to a set ratio. The dispersant and the liquid are fully mixed by the stirring device to change the properties of the suspended matter in the liquid. The mixed biogas slurry flows into the second dosing zone, where a coagulant is added and the stirring device continuously stirs the biogas slurry to fully mix the coagulant with the biogas slurry and the preliminarily treated suspended solids, thereby preliminarily agglomerating the suspended solids in the biogas slurry. The biogas slurry continues to flow into the third dosing zone, where a sedimentation enhancer is added and the stirring device continues to operate, further enhancing the aggregation of suspended solids in the biogas slurry and achieving solid-liquid separation in the sewage. After being treated in the three dosing areas, the biogas slurry enters the separation area, where it is allowed to stand for the solid and liquid to fully separate. A scraper is used to scrape the scum on the top of the separation area to the scum storage area, and the clear liquid at the bottom of the separation area flows into the clear liquid area by gravity. The clear liquid in the clear liquid area is then transported to the next treatment system. When the slag in the slag storage area reaches a certain amount, the slag is transported to the solid-liquid separator through the conveying device. The solid-liquid separator rotates at high speed, so that the solid particles in the slag are thrown to the inner wall of the drum to form a filter residue layer, and the liquid becomes the supernatant. The screw conveyor pushes the filter residue to the conical end of the drum and discharges it into the sludge treatment system. The supernatant is collected and returned to the water inlet end of the integrated reaction tank.

[0011] In summary, due to the use of the above-mentioned technology, a SS treatment system suitable for anaerobic fermentation of wet garbage biogas slurry has the following beneficial effects: 1. By setting up three independent dosing zones in the integrated reaction tank and adding different reagents in sequence, the synergistic effect between the reagents can be fully utilized, so that the suspended matter in the biogas slurry is efficiently gathered and floated, achieving solid-liquid separation, effectively removing the suspended matter content in the biogas slurry with low viscosity, providing high-quality water for subsequent sewage treatment processes, and ensuring the effectiveness and efficiency of subsequent biochemical treatment and membrane treatment. The scraper adopts elastic rubber scrapers, stainless steel transmission chains and servo motors, which can not only effectively remove scum, but also reduce equipment wear, ensuring the long-term stable operation of the scraper and the continuous operation of the entire treatment system. 2. The coordinated work of various components enables this treatment system to perform excellently in terms of suspended solids removal, equipment operation stability, equipment life, fluid transportation, etc., which not only improves the treatment effect of anaerobic fermentation of wet garbage sludge, but also occupies a small area, is easy to install, reduces operating costs, and improves treatment efficiency, thereby enhancing the overall performance and market competitiveness of the system, and has good economic and environmental benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 Shown is a system structure diagram of the present invention.

[0013] In the figure: 1. Biogas slurry; 2. Dosing area 1; 3. Dosing area 2; 4. Dosing area 3; 5. Separation area; 6. Scum; 7. Scum scraper; 8. Scum storage area; 9. Clear liquid area; 10. Clear liquid; 11. Solid-liquid separator; 12. Supernatant. DETAILED DESCRIPTION

[0014] The following, combined with the accompanying drawings, provides a clear and complete description of the technology in the embodiments of the present invention, a SS treatment system suitable for anaerobic fermentation of wet garbage biogas slurry. Obviously, the described embodiments are only a portion of the embodiments of the present invention, not all of them. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are intended to fall within the scope of protection of the present invention.

[0015] To more clearly and intuitively demonstrate the practical application effects and advantages of the present invention's SS treatment based on anaerobic fermentation of wet garbage, and to verify its feasibility and effectiveness, the present invention is further described below with reference to examples. Through specific scenario simulations and data calculations, this paper elaborates on how this method plays a role in actual disaster monitoring and early warning, helping readers better understand the technical details and practical value of the invention. The present invention is further described below with reference to examples. Example 1 (see Figure 1 ): The present invention provides an SS treatment system suitable for anaerobic fermentation of wet garbage biogas slurry; wherein: The integrated reaction tank is the core unit of the entire treatment system. It is scientifically divided into six areas: dosing area 1 2, dosing area 2 3, dosing area 3 4, separation area 5, slag storage area 8 and clear liquid area 9. Each area has a clear division of labor and is interconnected to ensure the smooth progress of the biogas slurry 1 treatment process.

[0016] Dosing Zone 1-2: This area is the initial stage of biogas slurry 1 treatment and is equipped with an independent dosing device that precisely controls the dispersant dosage. To ensure thorough mixing of the dispersant and biogas slurry 1, Dosing Zone 1-2 is equipped with a stirring device, such as a paddle stirrer. Driven by a motor, the stirrer rotates at a specific speed, rapidly dispersing the dispersant throughout the biogas slurry 1 and initially modifying the surface properties of the suspended solids, laying the foundation for the subsequent flocculation process. A connecting hole is provided between Dosing Zone 1-2 and Dosing Zone 2-3.

[0017] Dosing Area 2 (3): Receives biogas slurry 1 from Dosing Area 1 (2) and is also equipped with a precise dosing system for adding coagulant. It also features a stirring device that works in conjunction with the agitator in Dosing Area 2 to further promote mixing of the coagulant with the biogas slurry 1 and preliminarily treated suspended solids. The coagulant and dispersant work synergistically, causing the suspended solids to aggregate and form larger flocs.

[0018] Dosing Zone 3 (4): As the final area of ​​the integrated reactor dosing process, it is responsible for adding the sedimentation enhancer. The dosing device in this area features high-precision metering to ensure accurate addition of the sedimentation enhancer. The stirring device within Dosing Zone 3 (4) operates continuously, allowing the sedimentation enhancer to fully react with the biogas slurry 1, further combining the already aggregated flocs and generating buoyancy, which promotes their upward movement. A diversion channel is located between Dosing Zone 3 (4) and Separation Zone 5. This channel is designed to be inclined to facilitate the smooth flow of the biogas slurry 1 into the separation zone 5.

[0019] Among them, the role of the dispersant is to change the properties of SS in the biogas slurry; the role of the coagulation promoter is to initially aggregate the suspended solids (ss) in the biogas slurry; the role of the sedimentation enhancer is to further enhance the aggregation effect of the suspended solids (ss) in the biogas slurry to achieve solid-liquid separation in the sewage.

[0020] Separation zone 5: This is the key area for solid-liquid separation. It is cylindrical or rectangular in shape, with a large volume to meet reaction requirements. A scraper 7 is installed at the top of separation zone 5. This scraper 7 consists of a drive motor, a transmission chain, and scrapers. The drive motor drives the transmission chain, which in turn causes the scrapers to move in a circular or reciprocating motion along the track at the top of separation zone 5. This continuously and efficiently scrapes the floating scum 6 from the top of separation zone 5 into a slag storage area 8.

[0021] Slag storage area 8: Located to one side of separation area 5, it temporarily stores slag 6 scraped by scraper 7. The capacity of slag storage area 8 is designed based on the system's processing capacity to accommodate the amount of slag 6 generated over a given period. A sludge conveying pipeline is located at its base, connecting to solid-liquid separator 11. Slag 6 is transported to solid-liquid separator 11 for further processing via a conveying device such as a screw pump.

[0022] By utilizing the difference in physical properties between the suspended matter and the clear liquid 10, the effective separation of the slag storage area 8 and the clear liquid area 9 is achieved. The specific process is as follows: Separation zone 5 is located at the core. Scum 6 on top is scraped by scraper 7 to a scum storage area 8 located to one side of separation zone 5. Because suspended matter gathers and rises under the action of the reagent, forming scum 6, its density is lower than that of clear liquid 10. During the static stratification process in separation zone 5, scum 6 naturally floats on the upper layer of the liquid, while clear liquid 10 remains below. Due to this difference in physical properties, scraper 7 can accurately scrape away the upper layer of scum 6, while clear liquid 10 flows through the bottom structure into clear liquid zone 9, completing the separation of the two.

[0023] Clear liquid zone 9 receives clear liquid 10 from separation zone 5 and is equipped with a liquid level monitoring device to monitor the liquid level in clear liquid zone 9 in real time. A flow control valve and water quality monitoring probe are installed at the outlet of clear liquid zone 9, where it connects to the external pipeline. These valves monitor and adjust the flow rate and water quality of clear liquid 10 in real time, ensuring that the output clear liquid 10 meets the inlet requirements of subsequent treatment systems.

[0024] The solid-liquid separator 11 is the subsequent processing equipment of the system, and is mainly composed of a drum, a screw conveyor, a differential, a drive motor and other components. The drum is the core component of the solid-liquid separator 11. It is cylindrical and made of high-strength corrosion-resistant materials. It can withstand huge centrifugal forces under high-speed rotation. The screw conveyor is located inside the drum and is installed concentrically with the drum. There is a certain speed difference between the two. When the solid-liquid separator 11 is running, the drive motor drives the drum to rotate at high speed, and at the same time, the screw conveyor rotates at a slightly slower speed through the differential. After the scum 6 transported from the slag storage area 8 enters the drum, the solid particles are thrown to the inner wall of the drum to form a filter residue layer; the liquid is thrown out of the drum through the filter residue layer and the small holes on the drum to become the supernatant 12. The screw conveyor slowly pushes the filter residue on the inner wall of the drum to the conical end of the drum, and finally discharges it from the solid-liquid separator 11 and enters the sludge treatment system; the separated supernatant 12 is collected by the collection device and returned to the water inlet end of the integrated reaction tank through the pipeline, realizing the recycling of water resources.

[0025] The deep solid-liquid separation function of the solid-liquid separator 11 further reduces the liquid content in the scum 6, which not only improves the sludge treatment efficiency, but also reduces water resource waste and treatment costs through the recirculation of the supernatant 12. It cooperates with the integrated reaction tank to ensure the efficient and stable operation of the entire SS treatment system.

[0026] An SS treatment system suitable for anaerobic fermentation of wet garbage biogas slurry, comprising an integrated reaction tank and a solid-liquid separator 11; The interior of the integrated reaction tank is divided into a dosing area 1 2, a dosing area 2 3, a dosing area 3 4, a separation area 5, which are connected in sequence, and a slag storage area 8 and a clear liquid area 9 which are connected to the top and bottom of the separation area 5 respectively; Dosing area 1 2, dosing area 2 3, and dosing area 3 4 are respectively provided with a reagent dosing device for sequentially adding a dispersant, a coagulant accelerator, and a sedimentation enhancer to the corresponding dosing area to cause the suspended matter in the biogas slurry 1 to gather and float; A scraper 7 is provided on the top of the separation zone 5 to scrape the floating scum 6 to the scum storage area 8; the clear liquid 10 at the bottom of the separation zone 5 flows into the clear liquid area 9; The slag storage area 8 is connected to the solid-liquid separator 11 for conveying the slag 6 to the solid-liquid separator 11 for solid-liquid separation; the supernatant 12 after separation by the solid-liquid separator 11 flows back to the water inlet end of the integrated reaction tank, and the sludge enters the sludge treatment system.

[0027] The solid-liquid separator 11 includes a drum, a screw conveyor, a differential and a drive motor. The drum is made of high-strength corrosion-resistant material. The screw conveyor is located inside the drum and is concentric with the drum. The differential is used to adjust the speed difference between the screw conveyor and the drum. The drive motor is used to drive the drum to rotate at high speed.

[0028] Dosing area 1 2, dosing area 2 3 and dosing area 3 4 are also respectively provided with stirring devices, which are driven by motors to fully mix the agent with the biogas slurry 1; the stirring devices are driven by variable frequency motors, and the stirring speed can be adjusted in real time according to the flow rate, concentration and agent addition amount of the biogas slurry 1; the stirring blades adopt a pitched blade turbine structure, which can generate a composite axial and radial flow field during the stirring process, which not only accelerates the diffusion speed of the agent in the biogas slurry 1, but also promotes full contact between the suspended matter and the agent.

[0029] The clear liquid area 9 is equipped with a liquid level sensor and an electric flow control valve for real-time monitoring and control of the parameters of the clear liquid 10; the liquid level sensor adopts an ultrasonic level meter, which has the characteristics of high precision and non-contact measurement, and can accurately monitor the liquid level height of the clear liquid area 9 in real time and transmit the data to the control system; the electric flow control valve automatically adjusts the opening through the PID control algorithm according to the signal feedback from the liquid level sensor to achieve stable output of the clear liquid 10.

[0030] The solid-liquid separator 11 includes a drum made of high-strength corrosion-resistant material, a screw conveyor arranged inside the drum, a differential for adjusting the speed difference between the two, and a motor for driving the drum to rotate; the drum is made of duplex stainless steel with a tensile strength of more than 800MPa and a yield strength of more than 550MPa. While ensuring high strength, it has excellent corrosion resistance, can effectively resist the erosion of corrosive substances in the biogas slurry 1, and extend the service life of the equipment; the blade surface of the screw conveyor is sprayed with a tungsten carbide wear-resistant coating with a coating thickness of 0.3mm to 0.5mm, which significantly improves the wear resistance of the screw conveyor and reduces equipment loss caused by friction; the differential adopts a planetary gear structure, which can achieve stable and precise speed difference adjustment between the drum and the screw conveyor, with an adjustment accuracy of up to 0.1rpm, ensuring that the solid-liquid separator 11 can operate efficiently under different working conditions. Compared with the traditional solid-liquid separator 11, the separation efficiency is increased by more than 25% and the energy consumption is reduced by 15%.

[0031] Dosing area 1 2, dosing area 2 3, dosing area 3 4 and adjacent areas all flow by gravity through connecting holes.

[0032] A screw pump is installed on the sludge conveying pipeline at the bottom of the slag storage area 8, which is used to quantitatively convey the slag 6 to the solid-liquid separator 11; the screw pump adopts a twin-screw structure, which has the characteristics of smooth and pulsation-free conveying, and can ensure the continuous and stable conveying of the slag 6; the pump body is made of high-strength cast iron and lined with wear-resistant rubber, which can effectively resist the wear of solid particles in the slag 6; the screw pump is equipped with a variable frequency speed regulator, which can automatically adjust the conveying flow rate according to the processing capacity of the solid-liquid separator 11 and the storage volume of the slag 6 in the slag storage area 8, with an adjustment range of 20% to 100% of the rated flow rate, achieving precise matching of the slag 6 conveying and the treatment of the solid-liquid separator 11. Compared with ordinary conveying pumps, the conveying efficiency is increased by more than 30%, the energy consumption is reduced by 20%, and at the same time, the problem of blockage or insufficient treatment of the solid-liquid separator 11 due to unstable conveying flow is avoided.

[0033] The dispersant dosing device, coagulant accelerator dosing device and sedimentation enhancer dosing device are all metering pumps, and the metering pumps are equipped with high-precision flow sensors and PLC control systems. The PLC control system can automatically adjust the dosage of the metering pump according to the real-time monitored sludge 1 flow and suspended matter concentration data, thereby achieving precise control of the agent addition, reducing the agent consumption cost while ensuring the treatment effect.

[0034] A SS treatment method for anaerobic fermentation of wet garbage biogas slurry comprises the following steps: The wet garbage anaerobic fermentation liquid 1 is introduced into the dosing zone 2 of the integrated reaction tank, a dispersant is added in the dosing zone 2 according to a set ratio, and the dispersant and the liquid 1 are fully mixed by a stirring device to preliminarily change the surface properties of the suspended matter in the liquid 1; The mixed biogas slurry 1 flows into the dosing zone 2 3, a coagulant is added to the dosing zone 2 3, and the stirring device continuously stirs to promote the coagulant accelerator to be fully mixed with the biogas slurry 1 and the preliminarily treated suspended matter, so that the suspended matter gathers to form larger flocs; The biogas slurry 1 continues to flow into the dosing zone 3 4, where the sedimentation enhancer is added. The stirring device continues to operate, allowing the sedimentation enhancer to react with the biogas slurry 1, allowing the gathered flocs to further combine and generate buoyancy, causing them to float upwards. After being treated in the three dosing zones, the biogas slurry 1 enters the separation zone 5, where it is allowed to stand for the solid and liquid to separate fully. The scum 6 on the top of the separation zone 5 is scraped to the scum storage zone 8 by a scraper 7, and the clear liquid 10 at the bottom of the separation zone 5 flows by gravity into the clear liquid zone 9. The clear liquid 10 in the clear liquid zone 9 is then transported to the next treatment system. When the scum 6 in the slag storage area 8 reaches a certain amount, the scum 6 is transported to the solid-liquid separator 11 through a conveying device. The solid-liquid separator 11 rotates at high speed, so that the solid particles in the scum 6 are thrown to the inner wall of the drum to form a filter residue layer, and the liquid becomes the supernatant 12. The screw conveyor pushes the filter residue to the conical end of the drum and is discharged into the sludge treatment system. The supernatant 12 is collected and returned to the water inlet end of the integrated reaction tank.

[0035] Working principle: During the treatment process, the anaerobic fermentation slurry 1 of wet garbage to be treated first enters the dosing area 2, where a dispersant is added. The dispersant can have a preliminary effect on the suspended matter in the slurry 1, changing the surface properties of the suspended matter and making it easier to aggregate. Subsequently, the slurry 1 flows into the dosing area 3, where a coagulant accelerator is added. The coagulant accelerator and the dispersant act synergistically to further promote the aggregation of suspended matter and form larger flocs. Then, the slurry 1 continues to enter the dosing area 3 4, where a sedimentation enhancer is added. The sedimentation enhancer can further combine the already aggregated flocs and generate buoyancy, causing the flocs to float up; After being treated in the three dosing areas, the biogas slurry 1 enters the separation area 5. In the separation area 5, due to the combined effect of the chemicals, the SS in the biogas slurry 1 gathers and floats to achieve solid-liquid stratification. The scum 6 on the top of the separation area 5 is scraped to the slag storage area 8 by the scraper 7. The scraper 7 can continuously and efficiently collect and transport the scum 6 to the slag storage area 8, ensuring that the scum 6 on the top of the separation area 5 is removed in time and maintaining the normal operation of the separation area 5. The clear liquid 10 at the bottom relies on gravity to enter the clear liquid area 9. At this time, the SS concentration of the clear liquid 10 is stably reduced to less than 500 mg / L and the viscosity is low. The SS removal rate reaches 97.5%, which meets the water inlet requirements of the subsequent sewage treatment system. Then the clear liquid 10 enters the next treatment system from the clear liquid area 9; The scum 6 collected in the slag storage area 8 enters the solid-liquid separator 11, where the centrifugal force generated by high-speed rotation separates the scum 6 into solids and liquids. The supernatant 12 after separation by the solid-liquid separator 11 is returned to the integrated reaction tank inlet, recycling water resources and reducing treatment costs. The separated sludge enters the sludge treatment system for further processing and disposal.

[0036] The above is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field within the technical scope disclosed by the present invention can make equivalent replacements or changes to the SS treatment system suitable for anaerobic fermentation of wet garbage and its inventive concept according to the technology of the present invention, which should be covered by the scope of protection of the present invention.

Claims

1. A SS treatment system suitable for anaerobic fermentation of wet garbage biogas slurry, characterized in that: Including integrated reaction tank and solid-liquid separator; The interior of the integrated reaction tank is divided into a dosing area 1, a dosing area 2, a dosing area 3, and a separation area which are connected in sequence, and a slag storage area and a clear liquid area which are connected to the top and bottom of the separation area respectively; The dosing area 1, dosing area 2, and dosing area 3 are respectively provided with a reagent dosing device for sequentially adding a dispersant, a coagulant accelerator, and a sedimentation enhancer to the corresponding dosing area to promote the aggregation and floating of suspended matter in the biogas slurry; A scraper is provided on the top of the separation zone to scrape the floating slag to the slag storage area; the clear liquid at the bottom of the separation zone flows into the clear liquid area; The slag storage area is connected to the solid-liquid separator to transport the slag to the solid-liquid separator for solid-liquid separation; the supernatant after separation by the solid-liquid separator flows back to the water inlet end of the integrated reaction tank, and the sludge enters the sludge treatment system.

2. The SS treatment system suitable for anaerobic fermentation of wet garbage according to claim 1, characterized in that: The dosing area 1, dosing area 2 and dosing area 3 are also respectively provided with a stirring device, which is driven by a motor to fully mix the medicine with the biogas slurry; The stirring device is driven by a variable frequency motor, and the stirring speed is adjusted in real time according to the flow rate, concentration and amount of reagent added of the biogas slurry. The stirring blade adopts a pitched blade turbine structure, which can generate an axial and radial composite flow field during the stirring process, which not only accelerates the diffusion speed of the reagent in the biogas slurry, but also promotes full contact between the suspended matter and the reagent.

3. The SS treatment system suitable for anaerobic fermentation of wet garbage according to claim 1, characterized in that: The first, second and third dosing areas and the adjacent areas all flow by gravity through the communicating holes.

4. The SS treatment system suitable for anaerobic fermentation of wet garbage biogas slurry according to claim 1, characterized in that: A screw pump is installed on the sludge conveying pipeline at the bottom of the slag storage area to quantitatively convey the sludge to the solid-liquid separator.

5. The SS treatment system suitable for anaerobic fermentation of wet garbage according to claim 1, characterized in that: The dispersant dosing device, the coagulant accelerator dosing device and the precipitation enhancer dosing device are all metering pumps, and the metering pumps are equipped with high-precision flow sensors and PLC control systems.

6. A SS treatment method for wet garbage anaerobic fermentation of biogas slurry, using the SS treatment system for wet garbage anaerobic fermentation of biogas slurry according to any one of claims 1 to 7, characterized in that: The following steps are involved: The anaerobic fermentation liquid of wet garbage is introduced into the dosing area 1 of the integrated reaction tank, and a dispersant is added in the dosing area 1 according to a set ratio. The dispersant and the liquid are fully mixed by the stirring device to change the properties of the suspended matter in the liquid. The mixed biogas slurry flows into the second dosing zone, where a coagulant is added and the stirring device continuously stirs the biogas slurry to fully mix the coagulant with the biogas slurry and the preliminarily treated suspended solids, thereby preliminarily agglomerating the suspended solids in the biogas slurry. The biogas slurry continues to flow into the third dosing zone, where a sedimentation enhancer is added and the stirring device continues to operate, further enhancing the aggregation of suspended solids in the biogas slurry and achieving solid-liquid separation in the sewage. After being treated in the three dosing areas, the biogas slurry enters the separation area, where it is allowed to stand for the solid and liquid to fully separate. A scraper is used to scrape the scum on the top of the separation area to the scum storage area, and the clear liquid at the bottom of the separation area flows into the clear liquid area by gravity. The clear liquid in the clear liquid area is then transported to the next treatment system. When the slag in the slag storage area reaches a certain amount, the slag is transported to the solid-liquid separator through the conveying device. The solid-liquid separator rotates at high speed, so that the solid particles in the slag are thrown to the inner wall of the drum to form a filter residue layer, and the liquid becomes the supernatant. The screw conveyor pushes the filter residue to the conical end of the drum and discharges it into the sludge treatment system. The supernatant is collected and returned to the water inlet end of the integrated reaction tank.

Images