Advanced treatment system and treatment method for white spirit industrial wastewater

Abstract

The invention relates to the technical field of liquor industrial wastewater treatment, in particular to an advanced treatment system and method for liquor industrial wastewater. Comprising a water inlet pump, a quartz sand filter in pipeline connection with the water inlet pump, a self-cleaning filter in pipeline connection with the quartz sand filter, an ultrafiltration device in pipeline connection with the self-cleaning filter, an ultrafiltration water producing tank in pipeline connection with the ultrafiltration device, and a nanofiltration water feeding pump in pipeline connection with the ultrafiltration water producing tank, according to the present invention, the problem that the organic matter cannot be deeply and substantially removed after the biochemical treatment can be solved, and the separation treatment cost is low, and the high-cost treatment modes such as the advanced oxidation process such as Fenton do not need to be adopted so as to substantially reduce the production operation cost. According to the invention, blockages are backwashed to the micro-electrolysis device at the same time, so that the problem of blockage can be solved, and the centralized treatment efficiency of high-concentration pollutants causing blockage is also greatly improved.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology in the liquor industry, specifically to a deep treatment system and method for wastewater from the liquor industry. Background Technology

[0002] Wastewater from the liquor industry is generally characterized by high levels of suspended solids, organic matter, and pollutants such as nitrogen, phosphorus, and color, with COD concentrations consistently exceeding 80,000 mg / L. Pretreatment is typically employed, primarily using anaerobic and aerobic biological treatment, supplemented by chemical post-treatment and membrane separation—a multi-stage series process—to achieve compliant discharge of this wastewater.

[0003] Because the biochemical effluent from liquor production cannot achieve significant removal of organic matter to meet discharge standards even after oxidation processes, using advanced oxidation technologies like Fenton oxidation for downstream deep treatment is costly and still doesn't guarantee compliance. Furthermore, if the separation and treatment devices become clogged during later organic matter treatment, production must be shut down for cleaning, resulting in low overall water treatment efficiency. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a deep treatment system and method for wastewater from the liquor industry. This invention not only solves the problem of insufficient deep and significant removal of organic matter after biochemical treatment, but also significantly reduces production and operating costs by employing low-cost separation and treatment methods, eliminating the need for high-cost treatment methods such as Fenton oxidation processes. Furthermore, this invention utilizes the backwashing method of ultrafiltration and nanofiltration devices to simultaneously backwash the clogging material to the micro-electrolysis device, thus solving the clogging problem and greatly improving the centralized treatment efficiency of high-concentration pollutants causing clogging.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A deep treatment system for wastewater from a liquor industry includes an inlet pump, a quartz sand filter connected to the inlet pump via a pipeline, a self-cleaning filter connected to the quartz sand filter via a pipeline, an ultrafiltration device connected to the self-cleaning filter via a pipeline, an ultrafiltration product water tank connected to the ultrafiltration device via a pipeline, a nanofiltration feed water pump connected to the ultrafiltration product water tank via a pipeline, a nanofiltration device connected to the nanofiltration feed water pump via a pipeline, a nanofiltration product water tank and a nanofiltration concentrate tank connected to the nanofiltration device via a pipeline, a concentrate transfer pump connected to the nanofiltration concentrate tank via a pipeline, a micro-electrolysis device connected to the concentrate transfer pump via a pipeline, a flocculation sedimentation tank connected to the micro-electrolysis device via a pipeline, and a sludge dewatering device connected to the flocculation sedimentation tank via a pipeline. The inlet pump pipeline is connected to the effluent from the secondary sedimentation tank of the biological system; The concentrated water produced by the ultrafiltration unit, the cleaning water from the quartz sand filter, and the concentrated water from the concentrated water transfer pump all enter the micro-electrolysis unit. The sludge at the bottom of the flocculation sedimentation tank enters the sludge dewatering equipment for dewatering, and the dewatered dry sludge is transported off-site for disposal. The supernatant from the flocculation sedimentation tank and the wastewater from sludge dewatering enter the raw water equalization tank.

[0006] Furthermore, in the quartz sand filter, raw water enters from the top and exits from the bottom during water production, and cleaning water enters from the bottom and exits from the top during cleaning, and is sent to the micro-electrolysis device.

[0007] Furthermore, the ultrafiltration device includes an ultrafiltration section, an ultrafiltration backwash pump, and a security filter.

[0008] Furthermore, the ultrafiltration section pipeline is connected to the ultrafiltration product water tank; the inlet pipeline of the ultrafiltration backwash pump is connected to the ultrafiltration product water tank, and the outlet pipeline is connected to the first security filter and the quartz sand filter; the first security filter pipeline is connected to the ultrafiltration section, and the ultrafiltration backwash pump is periodically started to backwash the ultrafiltration section and the quartz sand filter.

[0009] Furthermore, the nanofiltration device includes a second security filter, a high-pressure pump, a first nanofiltration stage, an inter-stage booster pump, a second nanofiltration stage, and a flushing water pump.

[0010] Furthermore, the inlet pipe of the second security filter is connected to the outlet of the nanofiltration water pump, and the second security filter, the high-pressure pump, the first nanofiltration stage, the inter-stage booster pump, and the second nanofiltration stage are connected in sequence by pipes.

[0011] Furthermore, the nanofiltration section is also connected to the nanofiltration product water tank via a pipeline.

[0012] Furthermore, the nanofiltration two-stage pipeline connects the nanofiltration concentrate tank and the nanofiltration product tank.

[0013] Furthermore, the inlet pipe of the flushing water pump is connected to the nanofiltration product water tank, and the outlet pipe is connected to the second security filter. The flushing water pump is periodically started to backwash the first and second nanofiltration stages.

[0014] A method for treating wastewater from the liquor industry using the aforementioned deep treatment system includes the following steps: Step 1: After pretreatment and biochemical treatment, the wastewater from the liquor industry is discharged through the secondary sedimentation tank and then pumped into a quartz sand filter to further remove large-diameter suspended solids. Step 2: The water with suspended solids removed passes through a self-cleaning filter and enters the ultrafiltration device for membrane physical filtration to further remove suspended solids, colloids, and large molecular organic matter; the water filtered by the ultrafiltration membrane enters the ultrafiltration product water tank, and the concentrated water containing more pollutants that does not pass through the membrane enters the micro-electrolysis device. Step 3: Water from the ultrafiltration product tank enters the nanofiltration unit via the nanofiltration feed pump. After membrane separation to remove small molecule organic matter and desalination to reduce hardness, the water is discharged. In the nanofiltration unit, after passing through the second security filter, the water is pumped into the first nanofiltration stage of the nanofiltration unit. The clear water filtered by the nanofiltration membrane in the first nanofiltration stage enters the nanofiltration product tank. The concentrated water that does not pass through the first nanofiltration membrane enters the second nanofiltration stage via the inter-stage booster pump. The clear water filtered by the second nanofiltration membrane enters the nanofiltration product tank, and the concentrated water that does not pass through the second nanofiltration membrane enters the nanofiltration concentrate tank. Step 4: After the clean water from the nanofiltration product tank fully meets the requirements for direct discharge, it is discharged in compliance with standards. Step 5: The concentrate from the nanofiltration concentrate tank is transferred to the micro-electrolysis device via a concentrate transfer pump to further degrade the difficult-to-treat organic matter or break the benzene ring of the difficult-to-degrade benzene substances to generate easily degradable organic matter. Step 6: The effluent from the micro-electrolysis device enters the flocculation sedimentation tank, where PAC and PAM coagulant aids are added for flocculation and sedimentation. Step 7: The sludge settled at the bottom of the flocculation sedimentation tank enters the sludge dewatering device. The supernatant from the flocculation sedimentation tank and the wastewater generated by the sludge dewatering device enter the raw water equalization tank at the inlet of the sewage treatment plant. The dewatered dry sludge is transported off-site for treatment. Step 8: When the water production rate of the ultrafiltration unit drops to the set value or the membrane pressure difference reaches the set value, stop the water production of the ultrafiltration unit, turn on the ultrafiltration backwash pump to backwash the ultrafiltration section and the quartz sand filter, and the backwash water enters the micro-electrolysis device for treatment. Step 9: When the water production rate of the nanofiltration unit drops to the set value or the membrane pressure difference reaches the set value, stop the water production of the nanofiltration unit, turn on the flushing water pump to backwash the nanofiltration unit, and the flushing water enters the nanofiltration concentrate tank for treatment by the micro-electrolysis device.

[0015] Compared with the prior art, the present invention has the following beneficial effects: (1) The wastewater from the liquor industry of this invention enters the sewage treatment plant and undergoes pretreatment and biochemical treatment. After sludge settling in the secondary sedimentation tank, the effluent enters the advanced treatment system. In the advanced treatment stage, the effluent first enters the quartz sand filter to remove large-particle suspended solids, then passes through the ultrafiltration membrane separation device to further remove suspended solids, colloids, and macromolecular organic matter, and finally passes through the nanofiltration membrane separation device to remove small-molecule organic matter, desalinate and reduce hardness before being discharged. The effluent quality fully meets the direct discharge requirements in Table 3 of the "Emission Standard of Water Pollutants for Fermented Alcohol and Liquor Industry" (GB27631-2011) and is discharged stably in compliance with standards. The concentrated water, flushing water and quartz sand filter backwash water generated by the ultrafiltration and nanofiltration devices enter the micro-electrolysis device together to degrade organic matter or break the benzene ring of difficult-to-degrade benzene substances to generate easily degradable organic matter. After flocculation sedimentation and sludge dewatering and removal, the effluent returns to the raw water conditioning tank in the pretreatment stage at the front end of the plant. This invention not only solves the problem of the inability to deeply and significantly remove organic matter after biochemical treatment, but also greatly reduces production and operating costs by separating and processing it at a low cost and eliminating the need for high-cost treatment methods such as advanced oxidation processes like Fenton.

[0016] (2) This invention not only solves the problem that organic matter cannot be deeply and significantly removed after biochemical treatment, but also utilizes the backwashing method of ultrafiltration and nanofiltration devices to backwash the blockage material to the micro-electrolysis device at the same time. This not only solves the blockage problem, but also greatly improves the centralized treatment efficiency of high-concentration pollutants that cause blockage. Specifically, when the water production rate of the ultrafiltration device and nanofiltration device drops to the set value or the membrane pressure difference reaches the set value, the water production of the ultrafiltration device and nanofiltration device is stopped; the ultrafiltration backwash pump is turned on to backwash the ultrafiltration section and the quartz sand filter, and the flushing water pump is turned on to backwash the nanofiltration device. The flushing water enters the nanofiltration concentrate tank at the same time and is treated by the micro-electrolysis device. In this way, the blockage material is backwashed to the micro-electrolysis device at the same time. This not only solves the blockage problem, but also greatly improves the centralized treatment efficiency of high-concentration pollutants that cause blockage through the simultaneous backwashing of multiple devices, without the need for separate impurity treatment. Attached Figure Description

[0017] Figure 1 This is a connection diagram of a deep treatment system for wastewater from the liquor industry according to the present invention; Figure 2 This is a process flow diagram of a deep treatment system for wastewater from the liquor industry according to the present invention.

[0018] The attached figures are labeled as follows: 1. Inlet pump; 2. Quartz sand filter; 3. Self-cleaning filter; 4. Ultrafiltration unit; 4a. Ultrafiltration stage; 4b. Security filter one; 4c. Ultrafiltration backwash pump; 5. Ultrafiltration product water tank; 6. Nanofiltration feed water pump; 7. Nanofiltration unit; 7a. Security filter two; 7b. High-pressure pump; 7c. Nanofiltration stage one; 7d. Inter-stage booster pump; 7e. Nanofiltration stage two; 7f. Backwash pump; 8. Nanofiltration product water tank; 9. Nanofiltration concentrate tank; 10. Concentrate transfer pump; 11. Micro-electrolysis unit; 12. Flocculation sedimentation tank; 13. Sludge dewatering unit. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to embodiments. Of course, the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0020] Although the steps in this invention are arranged by reference numerals, this is not intended to limit the order of the steps. Unless the order of the steps is explicitly stated or the execution of a step requires other steps as a basis, the relative order of the steps can be adjusted. It is understood that the term "and / or" as used herein refers to and covers any and all possible combinations of one or more of the associated listed items.

[0021] Example like Figures 1-2 As shown, a deep treatment system for wastewater from the liquor industry includes an inlet pump 1, a quartz sand filter 2 connected to the inlet pump 1 via a pipeline, a self-cleaning filter 3 connected to the quartz sand filter 2 via a pipeline, an ultrafiltration device 4 connected to the self-cleaning filter 3 via a pipeline, an ultrafiltration product water tank 5 connected to the ultrafiltration device 4 via a pipeline, a nanofiltration feed water pump 6 connected to the ultrafiltration product water tank 5 via a pipeline, a nanofiltration device 7 connected to the nanofiltration feed water pump 6 via a pipeline, a nanofiltration product water tank 8 and a nanofiltration concentrate tank 9 connected to the nanofiltration device 7 via a pipeline, a concentrate transfer pump 10 connected to the nanofiltration concentrate tank 9 via a pipeline, a micro-electrolysis device 11 connected to the concentrate transfer pump 10 via a pipeline, a flocculation sedimentation tank 12 connected to the micro-electrolysis device 11 via a pipeline, and a sludge dewatering device 13 connected to the flocculation sedimentation tank 12 via a pipeline. The inlet pump 1 is connected to the effluent from the secondary sedimentation tank of the biological system via a pipeline; The concentrated water produced by the ultrafiltration device 4, the cleaning water of the quartz sand filter 2, and the concentrated water from the concentrated water transfer pump 10 all enter the micro-electrolysis device 11. The sludge at the bottom of the flocculation sedimentation tank 12 enters the sludge dewatering equipment 13 for sludge dewatering, and the dewatered dry sludge is transported off-site for treatment. The supernatant from flocculation sedimentation tank 12 and the wastewater from sludge dewatering enter the raw water equalization tank.

[0022] This invention relates to a wastewater treatment system for baijiu (Chinese liquor) industrial wastewater. After pretreatment and biochemical treatment at a wastewater treatment plant, the effluent, after sludge settling in a secondary sedimentation tank, enters a deep treatment system. In the deep treatment stage, the effluent first passes through a quartz sand filter to remove large-particle suspended solids, then through an ultrafiltration membrane separation unit to further remove suspended solids, colloids, and large-molecule organic matter. Finally, it passes through a nanofiltration membrane separation unit to remove small-molecule organic matter and desalinate to reduce hardness before being discharged. The effluent quality fully meets the direct discharge requirements in Table 3 of the "Emission Standard of Water Pollutants for Fermented Alcohol and Baijiu Industry" (GB27631-2011), ensuring stable and compliant discharge. The concentrated water, flushing water, and backwash water from the ultrafiltration and nanofiltration units, along with the quartz sand filter backwash water, enter a micro-electrolysis unit for organic matter degradation or to break down the benzene rings of difficult-to-degrade benzene compounds into easily degradable organic matter. After flocculation sedimentation and sludge dewatering, the effluent returns to the raw water equalization tank in the pretreatment stage at the front end of the plant. This invention not only solves the problem of the inability to deeply and significantly remove organic matter after biochemical treatment, but also greatly reduces production and operating costs by separating and processing it at a low cost and eliminating the need for high-cost treatment methods such as advanced oxidation processes like Fenton.

[0023] The quartz sand filter 2 consists of three layers of quartz sand from top to bottom, with thicknesses of 1-2mm, 0.5-1mm, and 0.5-8mm respectively.

[0024] Furthermore, in the quartz sand filter 2, the raw water enters from the top and exits from the bottom to the self-cleaning filter 3 during water production, and the cleaning water enters from the bottom and exits from the top to the micro-electrolysis device 11 during cleaning.

[0025] Furthermore, the ultrafiltration device 4 includes an ultrafiltration section 4a, an ultrafiltration backwash pump 4c, and a security filter 4b.

[0026] Furthermore, the ultrafiltration section 4a is connected to the ultrafiltration product water tank 5 via a pipeline; the inlet pipeline of the ultrafiltration backwash pump 4c is connected to the ultrafiltration product water tank 5, and the outlet pipeline is connected to the security filter 4b and the quartz sand filter 2; the security filter 4b is connected to the ultrafiltration section 4a via a pipeline, and the ultrafiltration backwash pump 4c is periodically started to backwash the ultrafiltration section 4a.

[0027] Furthermore, the nanofiltration device 7 includes a second security filter 7a, a high-pressure pump 7b, a first nanofiltration stage 7c, an inter-stage booster pump 7d, a second nanofiltration stage 7e, and a flushing water pump 7f.

[0028] Furthermore, the inlet pipe of the second security filter 7a is connected to the outlet of the nanofiltration water pump 6, and the second security filter 7a, the high-pressure pump 7b, the first nanofiltration stage 7c, the inter-stage booster pump 7d, and the second nanofiltration stage 7e are connected in sequence by pipes.

[0029] Furthermore, the nanofiltration section 7c is also connected to the nanofiltration product water tank 8 via a pipeline.

[0030] Furthermore, the nanofiltration second-stage 7e pipeline connects the nanofiltration concentrate tank 9 and the nanofiltration product tank 8.

[0031] Furthermore, the inlet pipe of the flushing water pump 7f is connected to the nanofiltration product water tank 8, and the outlet pipe is connected to the second security filter 7a. The flushing water pump 7f is started periodically to backwash the first nanofiltration stage 7c and the second nanofiltration stage 7e.

[0032] This invention not only solves the problem of insufficient deep and significant removal of organic matter after biochemical treatment, but also utilizes the backwashing method of ultrafiltration device 4 and nanofiltration device 7 to simultaneously backwash the blockage material to the micro-electrolysis device. This not only solves the blockage problem but also greatly improves the centralized treatment efficiency of high-concentration pollutants that cause blockage. Specifically, when the water production rate of ultrafiltration device 4 and nanofiltration device 7 drops to a set value or the membrane pressure difference reaches a set value, water production of ultrafiltration device 4 and nanofiltration device 7 is stopped; ultrafiltration backwash pump 4c is turned on to backwash ultrafiltration section 4a and quartz sand filter 2, and flushing water pump 7f is turned on to backwash nanofiltration device 7. The flushing water simultaneously enters nanofiltration concentrate tank 9 and is treated by micro-electrolysis device 11. In this way, the blockage material is simultaneously backwashed to the micro-electrolysis device, which not only solves the blockage problem but also greatly improves the centralized treatment efficiency of high-concentration pollutants that cause blockage through multi-stage backwashing, eliminating the need for separate impurity treatment.

[0033] A method for treating wastewater from the liquor industry using the aforementioned deep treatment system includes the following steps: Step 1: After pretreatment and biochemical treatment, the wastewater from the liquor industry is discharged through the secondary sedimentation tank and then enters the quartz sand filter 2 through the inlet pump 1 to further remove large-diameter suspended solids. Step 2: The water with suspended solids removed enters the ultrafiltration device 4 through the self-cleaning filter 3 for membrane physical filtration to further remove suspended solids, colloids, and large molecular organic matter; the water filtered by the ultrafiltration membrane enters the ultrafiltration product water tank 5, and the concentrated water containing more pollutants that does not pass through the membrane enters the micro-electrolysis device 11. Step 3: Water from the ultrafiltration product tank 5 enters the nanofiltration unit 7 via the nanofiltration feed pump 6. After membrane separation to remove small molecule organic matter and desalination to reduce hardness, the water is discharged. In the nanofiltration unit 7, after passing through the second security filter 7a, it enters the first nanofiltration stage 7c of the nanofiltration unit 7 via the high-pressure pump 7b. The clean water filtered by the nanofiltration membrane of the first nanofiltration stage 7c enters the nanofiltration product tank 8. The concentrated water that does not pass through the membrane of the first nanofiltration stage 7c enters the second nanofiltration stage via the inter-stage booster pump. The clean water filtered by the membrane of the second nanofiltration stage enters the nanofiltration product tank 8, and the concentrated water that does not pass through the membrane of the second nanofiltration stage enters the nanofiltration concentrate tank 9. Step 4: After the clean water from nanofiltration product tank 8 fully meets the requirements for direct discharge, it will be discharged in compliance with standards. Step 5: The concentrate from the nanofiltration concentrate tank 9 is transferred to the micro-electrolysis device 11 via the concentrate transfer pump 10 to further degrade the difficult-to-treat organic matter or break the benzene ring of the difficult-to-degrade benzene substances to generate easily degradable organic matter. Step 6: The effluent from the micro-electrolysis device 11 enters the flocculation sedimentation tank 12, and PAC and PAM coagulant aids are added for flocculation sedimentation. Step 7: The sludge settled at the bottom of the flocculation sedimentation tank 12 enters the sludge dewatering device 13. The supernatant of the flocculation sedimentation tank 12 and the wastewater generated by the sludge dewatering device 13 enter the raw water equalization tank at the inlet of the sewage treatment plant. The dewatered dry sludge is transported off-site for treatment. Step 8: When the water production rate of the ultrafiltration device 4 drops to the set value or the membrane pressure difference reaches the set value, stop the water production of the ultrafiltration device 4, turn on the ultrafiltration backwash pump 4c to backwash the ultrafiltration section 4a and the quartz sand filter 2, and the backwash water enters the micro-electrolysis device 11 for treatment. Step 9: When the water production rate of nanofiltration device 7 drops to the set value or the membrane pressure difference reaches the set value, stop the water production of nanofiltration device 7, turn on the flushing water pump 7f to backwash nanofiltration device 7, and the flushing water enters nanofiltration concentrate tank 9 and is treated by micro-electrolysis device 11.

[0034] The purified water from nanofiltration product tank 8 fully meets the direct discharge requirements in Table 3 of the "Emission Standard of Water Pollutants for Fermentation Alcohol and Baijiu Industry" (GB27631-2011), and is discharged in compliance with standards. System operation example data is shown in Table 1 below: Table 1 Example Data This invention discloses a deep treatment system and method for baijiu (Chinese liquor) industrial wastewater. After pretreatment and biochemical treatment at a wastewater treatment plant, the effluent from the secondary sedimentation tank, after sludge settling, enters the deep treatment system. In the deep treatment stage, the effluent first passes through a quartz sand filter 2 to remove large-particle suspended solids, then through an ultrafiltration device 4 for membrane separation to further remove suspended solids, colloids, and large-molecule organic matter. Finally, it passes through a nanofiltration device 7 for membrane separation to remove small-molecule organic matter and desalinate to reduce hardness before being discharged. The effluent quality fully meets the direct discharge requirements in Table 3 of the "Emission Standard of Water Pollutants for Fermented Alcohol and Baijiu Industry" (GB27631-2011), ensuring stable and compliant discharge. The concentrated water, flushing water, and backwash water from the ultrafiltration device 4 and nanofiltration device 7, along with the water from the quartz sand filter 2, enter a micro-electrolysis device 11 for organic matter degradation or to break down the benzene rings of difficult-to-degrade benzene compounds into easily degradable organic matter. After flocculation sedimentation and sludge dewatering, the effluent returns to the raw water conditioning tank in the pretreatment stage at the front end of the plant.

[0035] This system can effectively reduce the water quality indicators at the back end of the biochemical treatment system, achieve the standard of effluent water quality, and has low operator workload, high water treatment efficiency, and can operate stably for a long time.

[0036] Finally, it should be noted that all components involved in this invention are general standard parts or components known to those skilled in the art. Their structures and principles can be known to those skilled in the art through technical manuals or conventional experimental methods. In the idle parts of this system, all the above-mentioned electrical components, which refer to power elements, electrical components, and adapted controllers and power supplies, are connected by wires. The specific connection methods should refer to the working principle in this invention. The electrical connections between each electrical component are completed in the order of their operation. The detailed connection methods are all technologies known in the art.

[0037] The above description is only a preferred embodiment of the present invention. It should be noted that those skilled in the art can make several improvements and modifications without departing from the inventive concept of the present invention, and these all fall within the protection scope of the present invention.

Claims

1. A deep treatment system for wastewater from the liquor industry, characterized in that, The system includes an inlet pump (1), a quartz sand filter (2) connected to the inlet pump (1) via a pipe, a self-cleaning filter (3) connected to the quartz sand filter (2) via a pipe, an ultrafiltration device (4) connected to the self-cleaning filter (3) via a pipe, an ultrafiltration product water tank (5) connected to the ultrafiltration device (4) via a pipe, a nanofiltration feed pump (6) connected to the ultrafiltration product water tank (5) via a pipe, a nanofiltration device (7) connected to the nanofiltration feed pump (6) via a pipe, a nanofiltration product water tank (8) and a nanofiltration concentrate tank (9) connected to the nanofiltration device (7) via a pipe, a concentrate transfer pump (10) connected to the nanofiltration concentrate tank (9) via a pipe, a micro-electrolysis device (11) connected to the concentrate transfer pump (10) via a pipe, a flocculation sedimentation tank (12) connected to the micro-electrolysis device (11) via a pipe, and a sludge dewatering device (13) connected to the flocculation sedimentation tank (12) via a pipe. The inlet pump (1) is connected to the outlet of the secondary sedimentation tank of the biochemical system via a pipeline; The concentrated water produced by the ultrafiltration device (4), the cleaning water of the quartz sand filter (2), and the concentrated water from the concentrated water transfer pump (10) all enter the micro-electrolysis device (11). The sludge at the bottom of the flocculation sedimentation tank (12) enters the sludge dewatering equipment (13) for sludge dewatering, and the dewatered sludge is transported off-site for treatment. The supernatant and wastewater from sludge dewatering in the flocculation sedimentation tank (12) enter the raw water regulating tank.

2. The deep treatment system for wastewater from the liquor industry according to claim 1, characterized in that, The quartz sand filter (2) produces raw water that enters from the top and exits from the bottom to the self-cleaning filter (3), and clean water enters from the bottom and exits from the top to the micro-electrolysis device (11) during cleaning.

3. The deep treatment system for liquor industry wastewater according to claim 1, characterized in that, The ultrafiltration device (4) includes an ultrafiltration section (4a), an ultrafiltration backwash pump (4c), and a security filter (4b).

4. The deep treatment system for liquor industry wastewater according to claim 3, characterized in that, The ultrafiltration section (4a) is connected to the ultrafiltration product water tank (5) via a pipeline; the inlet pipeline of the ultrafiltration backwash pump (4c) is connected to the ultrafiltration product water tank (5), and the outlet pipeline is connected to the security filter (4b) and the quartz sand filter (2); the security filter (4b) is connected to the ultrafiltration section (4a) via a pipeline, and the ultrafiltration backwash pump (4c) is started periodically to backwash the ultrafiltration section (4a) and the quartz sand filter (2).

5. The deep treatment system for wastewater from the liquor industry according to claim 1, characterized in that, The nanofiltration device (7) includes a second security filter (7a), a high-pressure pump (7b), a first nanofiltration stage (7c), an inter-stage booster pump (7d), a second nanofiltration stage (7e), and a flushing water pump (7f).

6. The deep treatment system for liquor industry wastewater according to claim 5, characterized in that, The inlet pipe of the second security filter (7a) is connected to the outlet of the nanofiltration water pump (6), and the second security filter (7a), the high pressure pump (7b), the first nanofiltration stage (7c), the inter-stage booster pump (7d), and the second nanofiltration stage (7e) are connected in sequence by pipes.

7. The deep treatment system for wastewater from the liquor industry according to claim 5, characterized in that, The nanofiltration section (7c) is also connected to the nanofiltration product water tank (8) via a pipeline.

8. The deep treatment system for wastewater from the liquor industry according to claim 5, characterized in that, The nanofiltration second stage (7e) pipeline connects the nanofiltration concentrate tank (9) and the nanofiltration product tank (8).

9. The deep treatment system for wastewater from the liquor industry according to claim 5, characterized in that, The flushing water pump (7f) has its inlet pipe connected to the nanofiltration product water tank (8) and its outlet pipe connected to the second security filter (7a). The flushing water pump (7f) is started periodically to backwash the first nanofiltration stage (7c) and the second nanofiltration stage (7e).

10. A method for treating wastewater from the liquor industry using the deep treatment system according to any one of claims 1 to 9, characterized in that, Includes the following steps: Step 1: After the pretreatment and biochemical treatment of the wastewater from the liquor industry, the effluent after sedimentation in the secondary sedimentation tank enters the quartz sand filter (2) through the inlet pump (1) to further remove large-diameter suspended solids. Step 2: The water with suspended solids removed passes through the self-cleaning filter (3) and enters the ultrafiltration device (4) for membrane physical filtration to further remove suspended solids, colloids, and macromolecular organic matter; the water filtered by the ultrafiltration membrane enters the ultrafiltration product water tank (5), and the concentrated water containing more pollutants that does not pass through the membrane enters the micro-electrolysis device (11). Step 3: Water from the ultrafiltration product tank (5) is fed into the nanofiltration device (7) via the nanofiltration feed pump (6) to remove small molecule organic matter and reduce hardness through membrane separation. After passing through the second security filter (7a) in the nanofiltration device (7), it is pumped into the first nanofiltration stage (7c) by the high-pressure pump (7b). The clean water filtered by the nanofiltration membrane of the first nanofiltration stage (7c) enters the nanofiltration product tank (8). The concentrated water that does not pass through the membrane of the first nanofiltration stage (7c) is then fed into the second nanofiltration stage (7e) via the inter-stage booster pump (7d). The clean water filtered by the membrane of the second nanofiltration stage (7e) enters the nanofiltration product tank (8), and the concentrated water that does not pass through the membrane of the second nanofiltration stage (7e) enters the nanofiltration concentrate tank (9). Step 4: After the water quality of the nanofiltration product tank (8) fully meets the requirements for direct discharge, it is discharged in compliance with the standards. Step 5: The concentrate from the nanofiltration concentrate tank (9) is transferred to the micro-electrolysis device (11) via the concentrate transfer pump (10) to further degrade the difficult-to-treat organic matter or break the benzene ring of the difficult-to-degrade benzene substances to generate easily degradable organic matter. Step 6: The effluent from the micro-electrolysis device (11) enters the flocculation sedimentation tank (12), and PAC and PAM coagulant aids are added for flocculation sedimentation. Step 7: The sludge settled at the bottom of the flocculation sedimentation tank (12) enters the sludge dewatering device (13). The supernatant of the flocculation sedimentation tank (12) and the wastewater generated by the sludge dewatering device (13) enter the raw water regulating tank at the inlet of the sewage treatment plant together. The dewatered dry sludge is transported off-site for treatment. Step 8: When the water production rate of the ultrafiltration device (4) drops to the set value or the membrane pressure difference reaches the set value, stop the water production of the ultrafiltration device (4), turn on the ultrafiltration backwash pump (4c) to backwash the ultrafiltration section (4a) and the quartz sand filter (2), and the backwash water enters the micro-electrolysis device (11) for treatment. Step 9: When the water production rate of the nanofiltration device (7) drops to the set value or the membrane pressure difference reaches the set value, stop the water production of the nanofiltration device (7), turn on the flushing water pump (7f) to backwash the nanofiltration device (7), and the flushing water enters the nanofiltration concentrate tank (9) and is treated by the micro-electrolysis device (11).

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