A filter mud pressure filtration juice recovery processing system for a sugar cane sugar mill

Abstract

A kind of filter mud of sugar cane sugar factory is handled by pressure filtration juice recovery processing system, utilize high pressure filter dewatering machine and carry out dewatering to wet filter mud, according to the sugar content of the pressure filtration juice obtained, it is transported to mixed juice tank, neutralization juice tank, filter juice tank or ultrafiltration system, when it is transported to ultrafiltration system, the clear liquid obtained after pressure filtration is sent back to press as permeate water;Or according to the sugar content of the pressure filtration juice obtained, it is transported to liquid fermentation tank or ultrafiltration system, when it is transported to ultrafiltration system, the clear liquid obtained after ultrafiltration is pumped into ultrafiltration clear juice storage tank, then evaporate and concentrate using MVR evaporation concentrator, and then stored by liquid sugar storage tank.The application of the system can solve the problem of high processing cost and low resource utilization rate of filter mud of sugar cane sugar factory due to too high moisture content, and fully recover the sugar content, improve the economic benefit of sugar making enterprise, and reduce environmental pressure.

Description

Technical Field

[0001] This utility model relates to the technical field of sugarcane sugar mill equipment, specifically a system for recovering and treating filter juice from filter mud in sugarcane sugar mills. Background Technology

[0002] Currently, the vast majority of sugarcane sugar mills use the sulfite process. After the juice settles, it is divided into two parts: a clear, transparent juice (approximately 70-75%), which directly enters the next process; and a mud juice (approximately 25-30%), mainly composed of sugarcane juice, silt, sugarcane bran, and sediment formed by the reaction of clarifying agents with impurities in the juice. Since the mud juice produced during the clarification process still contains about 95% sugar, it must be separated to recover the sugar content, minimizing sugar loss and improving sugar production efficiency. Sugar mills commonly use filter clothless vacuum filters to filter the mud juice, obtaining filter mud. Analysis shows that the dry filter mud after sugarcane processing contains 13.43% protein, 8.21% crude fiber, 25.04% crude ash, 8.51% crude fat, 43.89% nitrogen-free extract, 5.63% calcium, and 0.93% phosphorus. Its metabolizable energy is 10.84 MJ / kg. Filter mud is also rich in various nutrients. 100g of dry filter mud contains 0.013g of copper, 0.38g of iron, 0.08g of manganese, 0.016g of zinc, 0.01g of cobalt, 2.12g of sulfur, 0.19g of magnesium, 0.32g of potassium, and 0.01g of sodium. In addition, filter mud also contains a considerable amount of sugarcane bran, protein, pectin, organic acids, and other organic matter. Currently, the main recycling method for filter mud is through biological fermentation, using it as a raw material for the production of organic fertilizer and compound fertilizer.

[0003] To improve the efficiency of bio-fermentation of filter mud, it is necessary to dehydrate it. The most common dehydration methods for preparing organic fertilizer from filter mud include natural sun-drying, heat drying, or adding other organic dry additives. Among these, natural sun-drying is inefficient, easily affected by weather, requires a large area, and can also pollute the air with foul odors generated during the sun-drying process due to natural fermentation of the filter mud. Heat drying requires an external heat source, resulting in higher production costs, and the drying process also generates foul odors, posing environmental hazards. Adding organic dry additives presents problems such as a lack of stable sources for many of these additives. The moisture content of the filter mud determines its fermentation time and efficiency. When using filter mud with a moisture content of approximately 60% to ferment and prepare organic fertilizer, it takes as long as 30 to 40 days from the start of fermentation to obtaining fertilizer with a moisture content that meets national standards (≤30%). This results in very low production efficiency for fertilizer companies, making it difficult to keep pace with sugar mill production during the crushing season. There is a mismatch between the production and use of filter mud fertilizer, preventing the true realization of an ecological closed-loop cycle of "sugarcane—filter mud—sugarcane field—sugarcane". Due to the lack of effective comprehensive utilization, most sugarcane sugar production enterprises can only hand over the filter mud to third parties for treatment, either free of charge or for a fee, which has become a burden for sugar production enterprises.

[0004] During the 2024 / 2025 sugarcane crushing season, a sugar industry and comprehensive utilization engineering research center in Guangxi collected 61 wet filter mud samples from 43 sugarcane factories. Dehydration experiments were conducted using high-pressure filtration. The average moisture content of the wet filter mud was 67.72%, and the average moisture content of the dried filter mud after high-pressure filtration was 46.29%, meaning an average of 0.4 tons of water could be extracted from 1 ton of wet filter mud. The average Brix, gravity purity, and sucrose content of the resulting filter juice were 8.06 Brix, 59.40 GP, and 4.84%, respectively. The dried filter mud, after adding microbial inoculum, could be fully fermented in only 7-15 days, significantly shortening the fermentation time for organic fertilizer production. Filter mud dehydrated to below 55% moisture content can be directly fermented to produce organic fertilizer or compound fertilizer, eliminating the need for the traditional moisture adjustment process for filter mud as fertilizer raw material. The fermentation time can be shortened to approximately 15 days, thereby shortening the fertilizer production cycle, reducing production costs, and significantly reducing environmental pressure. Meanwhile, by further optimizing the fermentation strains and formula, it not only improves the fertilizer efficiency of filter mud but also has a good effect on improving acidic soil. It is a high-quality fertilizer and acidic soil conditioner, and long-term application can significantly improve sugarcane yield and quality.

[0005] Whether for fermentation to produce organic fertilizer or for use as animal feed, the key step in using filter mud is rapid dewatering. While existing efficient sludge dewatering technologies and equipment can meet the dewatering requirements of wet filter mud, a large amount of filter juice is generated after dewatering. This filter juice contains sugar, and simply returning the sugary water generated during dewatering to a separate stage in a sugarcane sugar production line would inevitably have an immeasurable impact on the quality and sugar yield of refined sugar. Currently, there is no effective method or device for harmlessly treating the sugary water generated during dewatering and fully recovering its sugar content. The shortage of technology and equipment for treating the sugary water generated during filter mud dewatering has clearly become a major bottleneck restricting the resource utilization of filter mud. Summary of the Invention

[0006] The purpose of this invention is to address the problems existing in the prior art by providing a system for recovering and treating the filtrate from filter mud in sugarcane sugar mills. This system can harmlessly treat the sugary water produced during the high-pressure dehydration process of filter mud and recover the sucrose from it, thus solving the bottleneck in filter mud dehydration and laying the foundation for the resource-based treatment and utilization of filter mud.

[0007] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A system for recovering and treating filter juice from filter mud in a sugarcane sugar refinery has two options: The first system includes a high-pressure filter press, a filter juice collection tank, and an ultrafiltration system. The filter juice outlet of the high-pressure filter press is connected to the filter juice collection tank. The outlet of the filter juice collection tank is connected via branch pipelines to the mixing tank, neutralizing tank, and filtering tank of a five-roller sugarcane sugar refinery production line. The outlet of the filter juice collection tank is also connected to the ultrafiltration system via branch pipelines. A delivery pump is installed at the outlet of the filter juice collection tank, and valves are installed on each branch pipeline. The clear liquid outlet of the ultrafiltration system is connected via pipelines to the permeate water supply of the press.

[0008] A further preferred embodiment: the permeate water supply point of the press is the overflow trough on the feed conveyor belt of the No. 5 press in the sugarcane sugar production line of five three-roll presses, and the clear liquid side outlet of the ultrafiltration system is connected to the overflow trough on the feed conveyor belt of the No. 5 press through a pipeline.

[0009] A further preferred embodiment: the concentrate outlet of the ultrafiltration system is connected to a biological treatment tank via a pipeline, and the concentrate is treated in the biological treatment tank before being discharged in compliance with standards.

[0010] A further preferred embodiment: the filter juice collection tank is equipped with an online saccharimeter, the valves on each branch pipeline are automatically switched on and off, the online saccharimeter is matched and connected to a controller that controls the opening and closing of the valves, and the controller controls the opening and closing of the corresponding valves according to the sugar content value of the filter juice measured by the online saccharimeter.

[0011] The above system is used when filter mud is dewatered in the sugarcane sugar refinery production area using a high-pressure filter press. When the high-pressure filter press is installed in the sugarcane sugar refinery production area, in addition to the high-pressure filter press, online saccharimeter, filter juice collection tank, and ultrafiltration system, other equipment can utilize existing equipment on the sugarcane sugar refinery's white sugar production line. The high-pressure filter press uses existing technology and equipment, which can be purchased and installed commercially. A model capable of directly dewatering the wet filter mud from about 70% to below 50% moisture content is adopted. When the online saccharimeter detects that the sugar content of the filter juice is ≤1.5%, the valve on the pipeline connecting the outlet of the filter juice collection tank to the ultrafiltration system opens, and the filter juice is pumped to the ultrafiltration system. The clarified liquid obtained after ultrafiltration is transported to the overflow trough on the feed conveyor belt of the No. 5 press, and the concentrated liquid obtained after ultrafiltration enters the biological treatment tank. When the online saccharimeter detects a sugar content of 1.5–3.5% in the filtered juice, the valve on the pipeline connecting the outlet of the filtered juice collection tank to the mixing tank opens; the filtered juice is then pumped to the mixing tank. When the online saccharimeter detects a sugar content of 3.5–5.5% in the filtered juice, the valve on the pipeline connecting the outlet of the filtered juice collection tank to the neutralizing tank opens; the filtered juice is then pumped to the neutralizing tank. When the online saccharimeter detects a sugar content ≥5.5% in the filtered juice, the valve on the pipeline connecting the outlet of the filtered juice collection tank to the filter tank opens; the filtered juice is then pumped to the filter tank. The dry filter mud discharged from the high-pressure filter press is transported out of the sugarcane sugar mill for fermentation to produce organic fertilizer. In this system, only one valve is open, the others are closed, and only one branch pipeline flows through the filtered juice.

[0012] The second type of filter press juice recovery and treatment system includes a high-pressure filter press dehydrator, a filter press juice collection tank, and an ultrafiltration system. The filter press juice outlet of the high-pressure filter press dehydrator is connected to the filter press juice collection tank. The outlet of the filter press juice collection tank is connected to the ultrafiltration system through a branch pipeline. A transfer pump is installed at the outlet of the filter press juice collection tank. The clear liquid side outlet of the ultrafiltration system is connected to an ultrafiltration clear juice storage tank through a pipeline. The ultrafiltration clear juice storage tank is connected to the inlet of an MVR evaporator concentrator through a pump pipeline. The outlet of the MVR evaporator concentrator located at the bottom is connected to a liquid sugar storage tank through a pipeline.

[0013] A further preferred embodiment: the outlet of the filter juice collection tank is also connected to the liquid fermentation tank via branch pipelines, each branch pipeline being equipped with a valve. An online saccharimeter is installed on the filter juice collection tank or at its outlet. The online saccharimeter detects the sugar content of the filter juice in the collection tank. To achieve automatic control, the valves can be automatically on and off. The online saccharimeter is matched and connected to a controller, which controls the opening and closing of the corresponding valves based on the sugar content value of the filter juice measured by the online saccharimeter.

[0014] A further preferred embodiment: the concentrate side outlet of the ultrafiltration system is connected to a liquid fermentation tank via a pipeline.

[0015] The above system is applied when a high-pressure filter press dewatering machine is installed in the production area of ​​an organic fertilizer plant far from a sugarcane refinery: When the online saccharimeter detects that the sugar content of the filter juice is <3%, the valve on the pipeline connecting the outlet of the filter juice collection tank to the liquid fermentation tank opens, and the filter juice is pumped into the liquid fermentation tank; when the online saccharimeter detects that the sugar content of the filter juice is ≥3%, the valve on the pipeline connecting the outlet of the filter juice collection tank to the ultrafiltration system opens, and the filter juice is pumped to the ultrafiltration system. The clarified liquid obtained after ultrafiltration is pumped into the ultrafiltration clarified liquid storage tank, and the concentrated liquid obtained after ultrafiltration enters the liquid fermentation tank, where it is fermented to become liquid organic fertilizer; the dry filter mud outlet of the high-pressure filter press dewatering machine is connected to the solid fermentation tank via a belt conveyor, and the dry filter mud discharged from the high-pressure filter press dewatering machine is conveyed into the solid fermentation tank via a belt conveyor. The liquid fermentation tank and the solid fermentation tank use existing organic fertilizer fermentation tanks.

[0016] Further preferred: The ultrafiltration system uses organic or inorganic membrane filters, which are commonly used devices in beverage or water treatment, as long as the pore size is 0.02 to 0.2 µm.

[0017] The filter mud filtrate recovery and treatment system of this sugarcane sugar refinery has the following beneficial effects: 1. By employing mature high-pressure dehydration technology, the filter mud from sugarcane mills can be reduced from approximately 70% to below 50%. This allows for direct fermentation to produce organic fertilizer or animal feed without the need for drying. This reduces transportation costs and fermentation time, lowering the production cost of organic fertilizer or animal feed and laying the foundation for the resource utilization of filter mud. It completely solves the problem of increased production costs in most sugarcane mills due to a lack of effective resource utilization methods for filter mud, forcing them to rely on third-party processing. This significantly improves the economic efficiency of sugar enterprises and reduces odor generated during fermentation, thus alleviating environmental pressure.

[0018] 2. Based on the sugar content of the sugar-containing water obtained during the filter mud dewatering process, an appropriate sugar recovery path is automatically selected. Under the premise of not affecting the normal production and product quality of sugarcane sugar enterprises, the sugar recovery rate of the sugar-containing water is maximized, which can not only solve the bottleneck of wet filter mud dewatering, but also improve the sugar yield. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the connection structure of the filter juice recovery system for the filter mud of the sugarcane sugar mill in Example 1; Figure 2 This is a schematic diagram of the connection structure of the filter juice recovery system for the filter mud of the sugarcane sugar mill in Example 2; The names corresponding to the serial numbers in the figure are: 1. Press No. 1, 2. Press No. 2, 3. Press No. 3, 4. Press No. 4, 5. Press No. 5, 6. Overflow Tank, 7. Mixed Juice Tank, 8. Mixed Juice Heater, 9. Sulfur Fumigation Neutralizer, 10. Neutralized Juice Tank, 11. Neutralized Juice Heater, 12. Multi-layer Sedimentation Tank, 13. Sludge Tank, 14. Vacuum Filter without Filter Cloth, 15. Single-layer Rapid Sedimentation Tank, 16. Biological Tank, 17. Liquid Fermentation Tank, 18. 19. High-pressure filter press dehydrator; 20. Online saccharimeter; 21. Filter juice collection tank; 22. Ultrafiltration system; 23. Filter juice box; 24. Filter juice heater; 25. Clear juice box; 26. Clear juice heater; 27. Syrup box; 28. Evaporation and concentration system; 29. ​​Sugar boiling tank; 30. Honey separator; 31. Ultrafiltration clear juice storage tank; 32. MVR evaporator and concentrator; 33. Liquid sugar storage tank; 34. Solid fermentation tank; 35. Controller. Detailed Implementation

[0020] To provide a more detailed description of this utility model, the following description, in conjunction with the embodiments and accompanying drawings, will further illustrate this utility model.

[0021] Example 1

[0022] A system for recovering and treating filter juice from filter mud in a sugarcane sugar refinery includes a biochemical tank 16, a high-pressure filter press 18, a filter juice collection tank 20, an ultrafiltration system 21, and a controller 34. The filter juice outlet of the high-pressure filter press 18 is connected to the filter juice collection tank 20. The outlet of the filter juice collection tank 20 is connected via branch pipelines to the mixing juice tank 7, the neutralizing juice tank 10, and the filter juice tank 22 of a five-unit three-roller sugarcane press production line. The outlet of the filter juice collection tank 20 is also connected via branch pipelines to the ultrafiltration system 21. The filter juice collection tank 20 is equipped with a transfer pump at its outlet, and valves are installed on each branch pipeline. An online saccharimeter 19 is installed on the filter juice collection tank 20, and the online saccharimeter 19 is matched and connected to a controller 34. The controller 34 controls the opening and closing of the corresponding valves based on the sugar content value of the filter juice measured by the online saccharimeter 19. The clear liquid outlet of the ultrafiltration system 21 is connected to the overflow trough 6 on the feed conveyor belt of the No. 5 press 5 via a pipeline, and the concentrated liquid outlet of the ultrafiltration system 21 is connected to the biological treatment tank 16 via a pipeline. The ultrafiltration system 21 uses an organic or inorganic membrane filtration system with a pore size of 0.02–0.2 µm.

[0023] The above system is used when filter mud is dehydrated in the sugarcane sugar refinery production area using a high-pressure filter press dewatering machine 18. When the high-pressure filter press dewatering machine 18 is installed in the sugarcane sugar refinery production area, in addition to the high-pressure filter press dewatering machine 18, online saccharimeter 19, filter juice collection tank 20 and ultrafiltration system 21, other equipment can utilize the existing equipment on the sugarcane sugar refinery's white sugar production line. The high-pressure filter press dewatering machine 18 uses existing technical equipment and can be purchased and installed commercially, for example, purchased from Guangxi Liyuanbao Technology Co., Ltd., selecting the TSB-2000A-2 model; if purchased from other companies, a model that can directly dehydrate the moisture of wet filter mud from about 70% to below 50% should be used. When the online saccharimeter 19 detects that the sugar content of the filtered juice is ≤1.5%, the valve on the pipeline connecting the outlet of the filtered juice collection tank 20 to the ultrafiltration system 21 is opened, and the filtered juice is pumped to the ultrafiltration system 21. The clarified liquid obtained after ultrafiltration is transported to the overflow trough 6 on the feed conveyor belt of the No. 5 press, and the concentrated liquid obtained after ultrafiltration enters the biological treatment tank 16. When the online saccharimeter 19 detects that the sugar content of the filtered juice is 1.5-3.5%, the valve on the pipeline connecting the outlet of the filtered juice collection tank 20 to the mixing juice tank 7 is opened; the filtered juice is pumped to the mixing juice tank 7. When the online saccharimeter 19 detects that the sugar content of the filtered juice is 3.5-5.5%, the valve on the pipeline connecting the outlet of the filtered juice collection tank 20 to the neutralizing juice tank 7 is opened, and the filtered juice is pumped to the neutralizing juice tank 7. When the online saccharimeter 19 detects that the sugar content of the filtrate is ≥5.5%, the valve on the pipeline connecting the outlet of the filtrate collection tank 20 and the filtrate box 22 is opened, and the filtrate is pumped to the filtrate box 22.

[0024] Five three-roll press units, including press 1, press 2, press 3, press 4, and press 5; each press has a feeding conveyor belt at its inlet; the feeding conveyor belts of presses 2, 3, 4, and 5 are all equipped with overflow troughs 6; the juice outlets at the bottom of presses 1 and 2 are connected to a mixing juice tank 7 via pipelines; the juice outlet at the bottom of press 3 is connected to the overflow trough 6 on the feeding conveyor belt of press 2 via pipelines; the juice outlet at the bottom of press 4 is connected to the overflow trough 6 on the feeding conveyor belt of press 3 via pipelines; the juice outlet at the bottom of press 5 is connected to the overflow trough 6 on the feeding conveyor belt of press 4 via pipelines; and the overflow trough 6 on the feeding conveyor belt of press 5 is connected to a hot water pipeline. The outlet of the mixing juice tank 7 is connected in sequence to the mixing juice heater 8 and the juice inlet of the sulfur fumigation neutralizer 9 via pipelines. The juice outlet at the bottom of the sulfur fumigation neutralizer 9 is connected to the neutralizing juice tank 10 via pipelines. The outlet of the neutralizing juice tank 10 is connected in sequence to the neutralizing juice heater 11 and the juice inlet of the multi-layer settling device 12 via pipelines. A few sugarcane sugar refineries use a single-layer fast settling device instead of the multi-layer settling device 12. The clear juice outlet of the multi-layer settling device 12 is connected to the clear juice tank 24 via pipelines. The multi-layer settling device 12 is located at the bottom. The slurry outlet is connected to the slurry tank 13 via a pipeline; the outlet of the slurry tank 13 is connected to the slurry inlet of the filter cloth-free vacuum filter 14 via a pipeline; the slurry outlet of the filter cloth-free vacuum filter 14 is connected to the slurry box 22 via a pipeline; the filter mud outlet of the filter cloth-free vacuum filter 14 is connected to the inlet of the high-pressure filter press dewatering machine 18 via a belt conveyor; the filter mud discharged from the filter mud outlet of the filter cloth-free vacuum filter 14 can be transported by a belt conveyor or transferred by a vehicle, and then filtered by the high-pressure filter press dewatering machine 18.

[0025] The outlet of the filtration tank 22 is connected in sequence to the filtration heater 23 and the inlet of the single-layer rapid settling device 15 via pipelines; the clear juice outlet of the single-layer rapid settling device 15 is connected to the clear juice tank 24 via pipelines, and the mud juice outlet of the single-layer rapid settling device 15 located at the bottom is connected to the mud juice tank 13 via pipelines; the outlet of the clear juice tank 24 is connected in sequence to the clear juice heater 25 and the evaporation and concentration system 27 via pipelines; the evaporation and concentration system 27 is a multi-effect evaporation system; the discharge port of the evaporation and concentration system 27 located at the bottom is connected to the syrup tank 26 via pipelines; the outlet of the syrup tank 26 is connected to the sugar boiling tank 28 via pipelines, and the discharge port of the sugar boiling tank located at the bottom is connected to the honey separator 29 via pipelines; the mixing juice tank 7, the neutralizing juice tank 10, and the filtration tank 22 are all equipped with stirring devices.

[0026] A sugar refinery that processes 1 million tons of sugarcane annually uses wet filter mud to dehydrate it under high pressure and recovers sugar from the resulting filter juice. The economic benefits of this process, converted into white sugar, are analyzed in the following table.

[0027]

[0028] A sugar refinery that processes 1 million tons of sugarcane annually sells its wet filter mud as a basic raw material for organic fertilizer after high-pressure filtration, dehydration, and fermentation. The resulting economic benefits are analyzed in the table below.

[0029]

[0030] As shown in the table above, in the sugarcane sugar production process, the wet filter mud produced from 1 million tons of sugarcane, after high-pressure filtration, can recover the sugar content from the sugar water and ferment the dry filter mud into organic fertilizer, which can add 11.281 million yuan in output value to the sugarcane sugar plant, with an average increase of 11.3 yuan per ton of sugarcane.

[0031] Example 2

[0032] A system for recovering and treating filter juice from filter mud in a sugarcane sugar refinery includes a liquid fermentation tank 17, a high-pressure filter press 18, a filter juice collection tank 20, and an ultrafiltration system 21. The filter juice outlet of the high-pressure filter press 18 is connected to the filter juice collection tank 20. The outlet of the filter juice collection tank 20 is connected to the liquid fermentation tank 17 and the ultrafiltration system 21 via branch pipelines, each branch pipeline being equipped with a valve. A transfer pump is installed at the outlet of the filter juice collection tank 20. An online saccharimeter 19 is installed on the filter juice collection tank 20, and the valves can be automatically opened and closed. The valves are disconnected. The online saccharimeter 19 is matched and connected to the controller 34. The controller 34 controls the opening and closing of the corresponding valves according to the sugar content value of the pressed juice measured by the online saccharimeter 19. The clear liquid side outlet of the ultrafiltration system 21 is connected to the ultrafiltration clear juice storage tank 30 through a pipeline. The ultrafiltration clear juice storage tank 30 is connected to the inlet of the MVR evaporator 31 through a pump pipeline. The outlet of the MVR evaporator 31 located at the bottom is connected to the liquid sugar storage tank 32 through a pipeline. The concentrated liquid side outlet of the ultrafiltration system 21 is connected to the liquid fermentation tank 17 through a pipeline.

[0033] The above system is applied when the high-pressure filter press dewatering machine 18 is installed in the production area of ​​an organic fertilizer plant far from the sugarcane sugar factory: When the online saccharimeter 19 detects that the sugar content of the filter juice is <3%, the valve on the pipeline connecting the outlet of the filter juice collection tank 20 to the liquid fermentation tank 17 is opened, and the filter juice is pumped into the liquid fermentation tank 17; when the online saccharimeter 19 detects that the sugar content of the filter juice is ≥3%, the valve on the pipeline connecting the outlet of the filter juice collection tank 20 to the ultrafiltration system 21 is opened, and the filter juice is pumped to the ultrafiltration system 21. The clear liquid obtained after ultrafiltration is pumped into the ultrafiltration clear liquid storage tank 30, and the concentrated liquid obtained after ultrafiltration enters the liquid fermentation tank 17; the dry filter mud outlet of the high-pressure filter press dewatering machine 18 is connected to the solid fermentation tank 33 via a belt conveyor, and the dry filter mud discharged from the high-pressure filter press dewatering machine 18 is conveyed into the solid fermentation tank 33 via a belt conveyor. The liquid fermentation tank 17 and the solid fermentation tank 33 adopt existing organic fertilizer fermentation tanks.

[0034] The above description is not intended to limit the present utility model, nor is the present utility model limited to the above examples. Any changes, modifications, additions or substitutions made by those skilled in the art within the scope of the present utility model should be protected by the present utility model.

Claims

1. A system for recovering and treating the filtrate from filter mud in a sugarcane refinery, characterized in that: The system includes a high-pressure filter press (18), a filter juice collection tank (20), and an ultrafiltration system (21). The filter juice outlet of the high-pressure filter press (18) is connected to the filter juice collection tank (20). The outlet of the filter juice collection tank (20) is connected to the mixing juice tank (7), neutralizing juice tank (10), and filtering juice tank (22) of the sugarcane sugar production line through branch pipelines. The outlet of the filter juice collection tank (20) is also connected to the ultrafiltration system (21) through branch pipelines. A delivery pump is installed on the pipeline at the outlet of the filter juice collection tank (20), and valves are installed on each branch pipeline. The clear liquid side outlet of the ultrafiltration system (21) is connected to the permeate water supply of the press through a pipeline.

2. The juice recovery and treatment system for filter mud from sugarcane sugar refineries according to claim 1, characterized in that: The permeate water supply point of the press is the overflow trough (6) on the feed conveyor belt of the No. 5 press (5), and the clear liquid side outlet of the ultrafiltration system (21) is connected to the overflow trough (6) on the feed conveyor belt of the No. 5 press (5) through a pipeline.

3. The juice recovery and treatment system for filter mud from sugarcane sugar refineries according to claim 1 or 2, characterized in that: The concentrated liquid outlet of the ultrafiltration system (21) is connected to the biochemical tank (16) via a pipeline.

4. The juice recovery and treatment system for filter mud from sugarcane sugar refineries according to claim 1, characterized in that: The filter juice collection tank (20) is equipped with an online saccharimeter (19), and the valve is an automatic valve that can be turned on and off. The online saccharimeter (19) is matched and connected to the controller (34) that controls the opening and closing of the valve.

5. A system for recovering and treating the filter juice from filter mud in a sugarcane refinery, characterized in that: The system includes a high-pressure filter press (18), a filter juice collection tank (20), and an ultrafiltration system (21). The filter juice outlet of the high-pressure filter press (18) is connected to the filter juice collection tank (20). The outlet of the filter juice collection tank (20) is connected to the ultrafiltration system (21) through a branch pipeline. A delivery pump is installed on the pipeline at the outlet of the filter juice collection tank (20). The clear liquid side outlet of the ultrafiltration system (21) is connected to an ultrafiltration clear juice storage tank (30) through a pipeline. The ultrafiltration clear juice storage tank (30) is connected to the inlet of an MVR evaporator (31) through a pumping pipeline. The outlet of the MVR evaporator (31) located at the bottom is connected to a liquid sugar storage tank (32) through a pipeline.

6. The juice recovery and treatment system for filter mud from sugarcane mills according to claim 5, characterized in that: The outlet of the filter juice collection tank (20) is also connected to the liquid fermentation tank (17) through a branch pipeline. Valves are installed on the branch pipelines. An online saccharimeter (19) is installed on the filter juice collection tank (20) or at the outlet.

7. The juice recovery and treatment system for filter mud from sugarcane sugar refineries according to claim 5, characterized in that: The concentrated liquid outlet of the ultrafiltration system (21) is connected to the liquid fermentation tank (17) via a pipeline.

8. The juice recovery and treatment system for filter mud from sugarcane sugar refineries according to claim 1 or 5, characterized in that: The ultrafiltration system (21) uses an organic or inorganic membrane filtration system with a pore size of 0.02 to 0.2 µm.

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