Efficient treatment process and device for bean product processing wastewater

Abstract

The invention relates to the field of wastewater treatment, and discloses an efficient treatment process and device for bean product processing wastewater, and the device comprises a primary sedimentation tank, a skimming sedimentation tank, a micro-nano air floatation tank, a two-stage A + MBR tank and a plate-and-frame filter press which are connected in sequence, comprising the following steps: S1, collecting acidic high-concentration organic wastewater generated by bean curd processing into a regulating tank for regulating water quality and water quantity; s2, the adjusted wastewater flows into a skimming sedimentation tank, the flow speed is slowed down under the action of a water blocking device contained in the skimming sedimentation tank, suspended solids are settled in a conical-hopper-shaped sludge settling area, and after scum passes through the skimming sedimentation tank, sludge is conveyed to a plate-and-frame filter press. According to the method, by optimizing the wastewater treatment process and structure, the construction, operation and maintenance cost is reduced, and the treatment efficiency is improved; aiming at the skimming machine, the scraping plate is endowed with a self-cleaning function, bearing overload is avoided, a skimming structure is optimized to prevent overflow, the skimming efficiency and the equipment stability are remarkably improved, and efficient and economical bean product wastewater treatment is realized.

Description

Technical Field

[0001] The present invention relates to the field of wastewater treatment, and in particular to a high-efficiency treatment process and device for bean product processing wastewater. Background Art

[0002] Soy products are traditional nutritious foods made from soybeans through a process of soaking and grinding. The number of licensed soy product companies in my country has been increasing annually, reaching 4,890 in March 2017, a 2.3% year-on-year increase. However, due to the difficulties faced by large companies in meeting regional consumption and overcoming shelf life issues, the industry remains dominated by small and medium-sized enterprises. In 2016, there were over 100,000 individual processors and small workshops. These companies face funding and technical deficiencies, as well as limited wastewater treatment capacity, which have become bottlenecks to their development.

[0003] Wastewater from soy product processing comes from a wide range of sources. Every ton of soybeans used generates approximately 20 tons of wastewater, including yellow pulp water and bean soaking water. The wastewater contains a large amount of suspended solids, organic matter and other pollutants. The water is turbid, has high chroma, acidic pH, high BOD and COD values, and the intermittent production leads to uneven water quality and quantity, making it difficult to treat. If discharged without treatment, it will cause eutrophication of the water body, endangering the living environment and health of residents. The current treatment methods include biological treatment, physical and chemical treatment and membrane technology treatment. The mainstream "physical and chemical method + biological method" coupling process has problems such as cumbersome procedures, complex equipment, secondary pollution and a large amount of residual sludge, and urgently needs to be optimized and improved.

[0004] In order to solve the problems of complicated process, complex device structure, low treatment efficiency and high operating cost in the existing soy product processing wastewater treatment, and at the same time overcome the defects that the existing skimmer cannot self-clean the scraper during use, resulting in scum adhesion increasing the scraper load, affecting the normal operation of the skimmer, and when scraping the scum, when the amount of scum is too large, it is easy to overflow from the bottom of the scraper, thereby affecting the scraping efficiency. Summary of the Invention

[0005] The purpose of the present invention is to provide an efficient treatment process and device for soy product processing wastewater to solve the following technical problems: to solve the problems of cumbersome, complex structure, low efficiency and high cost of the existing soy product processing wastewater treatment process, and at the same time overcome the defects of the skimmer scraper being unable to self-clean, easily overloaded and the scraping overflow leading to low efficiency.

[0006] The object of the present invention can be achieved by the following technical solution: an efficient treatment process for soy product processing wastewater, comprising a primary sedimentation tank, a skimming sedimentation tank, a micro-nano flotation tank, a two-stage A+MBR tank and a plate and frame filter press connected in sequence, comprising the following steps:

[0007] S1. Collecting the acidic high-concentration organic wastewater generated by tofu processing into a regulating pond for water quality and quantity regulation;

[0008] S2. The regulated wastewater flows into the skimming sedimentation tank. The flow rate is slowed down by the water blocker inside the skimming sedimentation tank. The suspended matter settles in the cone-shaped sludge settling area. After the scum passes through the skimming sedimentation tank, the sludge is sent to the plate and frame filter press. The clear liquid flows into the micro-nano flotation tank through the bottom water pipe.

[0009] S3: The clear liquid enters the reaction zone of the micro-nano flotation tank. A reagent is added at the bottom of the reaction zone to adjust the pH to 9. Suspended matter, pollutants and bubbles in the wastewater adhere to form a scum layer. After being treated in the skimming sedimentation tank, it is sent to the plate and frame filter press. The wastewater with the suspended matter removed contacts the composite elastic filler and is degraded by biofilm adsorption. It then enters the water storage area through the bottom water pipe and flows into the double-stage A+MBR tank.

[0010] S4. The sewage is sequentially treated in the double-stage A+MBR tank with primary anaerobic treatment, primary MBR treatment, secondary anaerobic treatment and secondary MBR treatment, and the treated clean water meets the discharge standards;

[0011] S5. The plate and frame filter press filters the scum from the skimming sedimentation tank and the micro-nano flotation tank, and the activated sludge from the two-stage MBR tank. The filtrate is returned to the skimming sedimentation tank, and the mud cake is used as organic fertilizer after fermentation.

[0012] As a preferred solution of the present invention: the skimming sedimentation tank includes a sewage sedimentation tank and a skimmer, and the skimmer is fixedly installed on the top of the sewage sedimentation tank;

[0013] An air flotation tank is provided inside the top of the sewage sedimentation tank, and a partition is provided on one end edge of the inner edge of the air flotation tank. Support frames are fixedly installed on both sides of the top of the sewage sedimentation tank, and the upper surfaces of the support frames on both sides of the top of the sewage sedimentation tank are fixedly connected with side panels, and one end of the two groups of side panels are fixedly connected with a first wedge block and a second wedge block, respectively. A top rack is fixedly connected to the upper side of the side panel on one side of the top of the sewage sedimentation tank, and a bottom rack is fixedly connected to the upper surface of the support frame on the other side of the top of the sewage sedimentation tank. The top rack and the bottom rack are both close to the center side of the sewage sedimentation tank, and the top rack and the side panel are located at one end of the sewage sedimentation tank, and the bottom rack and the side panel are located at the other end of the sewage sedimentation tank, and there is no overlapping part in the middle in the horizontal direction.

[0014] As a preferred embodiment of the present invention, the slag skimmer includes a sprocket shaft, the outer surfaces of both ends of the sprocket shaft are meshed with transmission chains, the outer surface of the transmission chain is fixedly connected to a scraping structure, and one end of the sprocket shaft is fixedly connected to a driving motor;

[0015] The scraping structure includes a self-cleaning component, a scraping component is movably connected to the top of the self-cleaning component, the scraping component includes a first scraping plate, a plug-in rod is slidably connected to the bottom of the first scraping plate, a return spring is sleeved on the outer surface of the plug-in rod, and limiting blocks are evenly arranged on both sides of the bottom of the scraping component.

[0016] As a preferred embodiment of the present invention, the self-cleaning assembly includes a connecting base, a second scraper plate is fixedly mounted on the top of the connecting base, a limited slide is provided on the side of the connecting base, a threaded connecting frame is slidably engaged with the inner portion of the limited slide, and self-cleaning plates are fixedly connected to the outer surfaces of both sides of the threaded connecting frame;

[0017] The middle part of the threaded connecting frame is threadedly connected to a threaded rod, and the outer surfaces of both ends of the threaded rod are fixedly installed with transmission gears. The center of the outer side surface of the transmission gear is fixedly connected to the rear conical block, and the side surfaces of the second scraper plate are evenly provided with limiting grooves, and the top center of the second scraper plate is provided with a limiting slot.

[0018] As a preferred solution of the present invention: both ends of the sprocket shaft are rotatably engaged with both end sides of the sewage sedimentation tank through limiting sleeves, and the drive motor is fixedly connected to the outer side surface of one end of the sewage sedimentation tank.

[0019] As a preferred solution of the present invention: the threaded rod is movably abutted against the outer surfaces of the side plates, the first wedge block and the second wedge block through the conical blocks at both ends, and the threaded rod is meshed and connected with the top rack and the bottom rack through the transmission gears at both ends.

[0020] As a preferred solution of the present invention: the self-cleaning component is movably abutted against the top of the partition through the scraping component, the scraping component is slidingly plugged into the top of the second scraping plate through the limiting slot, the scraping component is slidingly plugged into the limiting slide groove through the limiting blocks on both sides, and the bottom end of the plug-in rod is fixedly connected to the inner bottom surface of the limiting slot.

[0021] As a preferred solution of the present invention: the top of the partition is wedge-shaped, the self-cleaning plate is slidably engaged with the outer surfaces of both sides of the second scraper plate, and the two ends of the threaded rod are slidably engaged with the two ends of the connecting base.

[0022] Beneficial effects of the present invention:

[0023] (1) The present invention can significantly improve the treatment efficiency and reduce the operating cost by optimizing the soy product processing wastewater treatment process and device structure, adopt a simplified and efficient treatment process, abandon the traditional cumbersome multi-stage treatment process, and integrate the water quality adjustment, skimming sedimentation, flotation reaction, biochemical treatment and other links into an integrated design, reducing the equipment footprint and connecting pipelines, making the overall structure more compact and reasonable, and reducing equipment investment and maintenance costs.

[0024] (2) The present invention effectively solves the technical problems existing in traditional flotation machines through the innovatively designed self-cleaning scraper structure in the flotation treatment link. The scraper can be automatically cleaned during operation to avoid the adhesion and accumulation of scum, reduce the load-bearing burden of the scraper, extend the service life of the equipment and reduce the frequency of failures, thereby ensuring the stable operation of the flotation machine. At the same time, in order to solve the problem of overflow at the bottom of the scraper due to excessive scum, the scraping depth of the scraper is optimized to ensure that the scum can be efficiently and completely scraped and collected under high load conditions, greatly improving the scraping efficiency, and thus improving the processing capacity and stability of the entire flotation treatment unit. Through the above technical improvements, the present invention can achieve efficient treatment of soy product processing wastewater, and the effluent water quality is stable and meets the standards, creating significant economic and environmental benefits for the enterprise. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The present invention will be further described below with reference to the accompanying drawings.

[0026] Figure 1 It is a schematic diagram of the top plan and cross-sectional structure of the tofu processing wastewater treatment device;

[0027] Figure 2 This is the process flow chart for tofu processing wastewater treatment;

[0028] Figure 3 This is a schematic diagram of the structure of a high-efficiency treatment device for soy product processing wastewater;

[0029] Figure 4 This is a schematic diagram of the sewage treatment tank structure;

[0030] Figure 5 for Figure 4 A schematic diagram of the partially enlarged structure at center A;

[0031] Figure 6 for Figure 4 A schematic diagram of the partially enlarged structure at point B in the middle;

[0032] Figure 7 It is a schematic diagram of the scraping structure;

[0033] Figure 8 Schematic diagram of the scraping component structure;

[0034] Figure 9 Schematic diagram of the scraping assembly structure;

[0035] Figure 10 It is a schematic diagram of the cross-section structure of the self-cleaning component;

[0036] Figure 11 for Figure 10 Schematic diagram of the partially enlarged structure at point C in the middle.

[0037] Description of the drawings: 1. Sewage sedimentation tank; 2. Skimmer; 11. Partition; 12. Flotation tank; 13. Support frame; 14. Side panel; 15. Top rack; 16. First wedge block; 17. Limiting sleeve; 18. Second wedge block; 19. Bottom rack; 21. Scraping structure; 22. Transmission chain; 23. Sprocket shaft; 24. Drive motor; 211. Scraping assembly; 212. Self-cleaning assembly; 213. First scraper; 214. Connecting rod; 215. Limiting block; 216. Return spring; 217. Conical block; 218. Threaded rod; 219. Connecting base; 220. Limiting slide; 221. Transmission gear; 222. Limiting slide; 223. Limiting slot; 224. Self-cleaning plate; 225. Threaded connecting frame; 226. Second scraper. DETAILED DESCRIPTION

[0038] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0039] See also Figures 1-11 As shown, the present invention is an efficient treatment process for soy product processing wastewater, comprising a primary sedimentation tank, a skimming sedimentation tank, a micro-nano flotation tank, a two-stage A+MBR tank and a plate and frame filter press connected in sequence, including the following steps:

[0040] S1. Collecting the acidic high-concentration organic wastewater generated by tofu processing into a regulating pond for water quality and quantity regulation;

[0041] S2. The regulated wastewater flows into the skimming sedimentation tank. The flow rate is slowed down by the water blocker inside the skimming sedimentation tank. The suspended matter settles in the cone-shaped sludge settling area. After the scum passes through the skimming sedimentation tank, the sludge is sent to the plate and frame filter press. The clear liquid flows into the micro-nano flotation tank through the bottom water pipe.

[0042] S3: The clear liquid enters the reaction zone of the micro-nano flotation tank. A reagent is added at the bottom of the reaction zone to adjust the pH to 9. Suspended matter, pollutants and bubbles in the wastewater adhere to form a scum layer. After being treated in the skimming sedimentation tank, it is sent to the plate and frame filter press. The wastewater with the suspended matter removed contacts the composite elastic filler and is degraded by biofilm adsorption. It then enters the water storage area through the bottom water pipe and flows into the double-stage A+MBR tank.

[0043] S4. The sewage is sequentially treated in the double-stage A+MBR tank with primary anaerobic treatment, primary MBR treatment, secondary anaerobic treatment and secondary MBR treatment, and the treated clean water meets the discharge standards;

[0044] S5. The plate and frame filter press filters the scum from the skimming sedimentation tank and the micro-nano flotation tank, and the activated sludge from the two-stage MBR tank. The filtrate is returned to the skimming sedimentation tank, and the mud cake is used as organic fertilizer after fermentation.

[0045] The skimming sedimentation tank includes a sewage sedimentation tank 1 and a skimmer 2, and the skimmer 2 is fixedly installed on the top of the sewage sedimentation tank 1;

[0046] An air flotation tank 12 is provided inside the top of the sewage sedimentation tank 1, and a partition 11 is provided on one end of the inner edge of the air flotation tank 12. Support frames 13 are fixedly installed on both sides of the top of the sewage sedimentation tank 1. The upper surfaces of the support frames 13 on both sides of the top of the sewage sedimentation tank 1 are fixedly connected with side panels 14 respectively, and one end of the two groups of side panels 14 are fixedly connected with a first wedge block 16 and a second wedge block 18 respectively. A top rack 15 is fixedly connected to the upper side of the side panel 14 on one side of the top of the sewage sedimentation tank 1, and a bottom rack 19 is fixedly connected to the upper surface of the support frame 13 on the other side of the top of the sewage sedimentation tank 1. The top rack 15 and the bottom rack 19 are both close to the center side of the sewage sedimentation tank 1, and the top rack 15 and the side panel 14 are located at one end of the sewage sedimentation tank 1, and the bottom rack 19 and the side panel 14 are located at the other end of the sewage sedimentation tank 1, and there is no overlapping part in the middle in the horizontal direction.

[0047] The skimmer 2 includes a sprocket shaft 23, the outer surfaces of both ends of the sprocket shaft 23 are meshed with a transmission chain 22, the outer surface of the transmission chain 22 is fixedly connected to the scraping structure 21, and one end of the sprocket shaft 23 is fixedly connected to the driving motor 24;

[0048] The scraping structure 21 includes a self-cleaning component 212, and the top of the self-cleaning component 212 is movably connected to the scraping component 211. The scraping component 211 includes a first scraping plate 213, and the bottom of the first scraping plate 213 is slidably connected to the plug-in rod 214. The outer surface of the plug-in rod 214 is sleeved with a return spring 216. Limiting blocks 215 are evenly arranged on both sides of the bottom of the scraping component 211.

[0049] The self-cleaning assembly 212 includes a connecting base 219, a second scraper plate 226 being fixedly mounted on the top of the connecting base 219, and a limiting slide 220 being provided on the side of the connecting base 219. A threaded connecting frame 225 is slidably engaged with the interior of the limiting slide 220, and self-cleaning plates 224 are fixedly connected to the outer surfaces of both sides of the threaded connecting frame 225.

[0050] The middle part of the threaded connecting frame 225 is threadedly connected to a threaded rod 218, and a transmission gear 221 is fixedly installed on the outer surfaces of both ends of the threaded rod 218. The center of the outer side surface of the transmission gear 221 is fixedly connected to the rear conical block 217, and the side surfaces of the second scraper plate 226 are evenly provided with limiting grooves 222, and the top center of the second scraper plate 226 is provided with a limiting slot 223.

[0051] Both ends of the sprocket shaft 23 are rotatably engaged with the side surfaces of the sewage sedimentation tank 1 via the limiting sleeves 17 , and the driving motor 24 is fixedly connected to the outer side surface of one end of the sewage sedimentation tank 1 .

[0052] The threaded rod 218 is movably abutted against the outer surfaces of the side plate 14, the first wedge block 16 and the second wedge block 18 through the tapered blocks 217 at both ends, and the threaded rod 218 is meshedly connected with the top rack 15 and the bottom rack 19 through the transmission gears 221 at both ends.

[0053] The self-cleaning component 212 is movably abutted against the top of the partition 11 through the scraping component 211, and the scraping component 211 is slidingly plugged into the top of the second scraping plate 226 through the limiting slot 223. The scraping component 211 is slidingly plugged into the limiting slide 222 through the limiting blocks 215 on both sides, and the bottom end of the plug-in rod 214 is fixedly connected to the inner bottom surface of the limiting slot 223.

[0054] The top of the partition 11 is wedge-shaped, and the outer surfaces of both sides of the self-cleaning plate 224 and the second scraping plate 226 are slidably engaged, and the two ends of the threaded rod 218 are slidably plugged into the two ends of the connecting base 219.

[0055] The working principle of the present invention is as follows: the acidic tofu production wastewater is collected into the regulating tank for water quality and quantity adjustment, and then enters the skimming sedimentation tank for efficient sedimentation and skimming to remove heavier bean dregs, scum and grease; the pretreated wastewater enters the micro-nano flotation tank reaction zone, and PAC, PAM and NaOH are added to adjust the pH value. The reaction is fully stirred by pneumatic stirring, and flotation and aerobic treatment are carried out simultaneously in the micro-nano flotation machine. The suspended matter and pollutants in the wastewater are attached to the bubbles and float to the water surface to form a scum layer. The wastewater then passes over the partition and fully contacts the elastic filler of the aerobic tank. The biofilm attached to the filler surface is further adsorbed and degraded; the effluent from the aerobic tank enters the double-stage A+MBR tank, Carry out biochemical treatment and efficient mud and water separation; in the anaerobic treatment section, the organic matter in the sewage is decomposed by anaerobic microorganisms under anaerobic conditions, and large molecular organic matter such as protein, carbohydrates and fat are decomposed into small molecular organic matter such as organic acids, alcohols and carbon dioxide. In addition, the anaerobic section also has the function of denitrification and phosphorus removal, and converts nitrogen-containing compounds into ammonia nitrogen through ammoniation reaction; in the deep treatment section, mud and water separation is carried out through the efficient solid-liquid separation effect of the MBR membrane to further remove pollutants such as suspended matter, trace organic matter and ammonia nitrogen remaining in the wastewater. Part of the activated sludge is returned to the anaerobic tank to ensure the sludge concentration, and part of the activated sludge is regularly filtered through a plate and frame filter press, and the mud cake is transported out, and the clean water meets the discharge standards or is reused.

[0056] The skimming sedimentation tank is equipped with a water blocker at its center, a conical bucket-shaped sedimentation area at its bottom, scum troughs around its perimeter, and a skimmer above. After wastewater from the regulating tank enters the sedimentation tank, impurities and sludge particles fall by gravity into the conical bucket-shaped sedimentation area and are regularly discharged to the plate and frame filter press through the sludge pipe. The scum is scraped by the skimmer into the scum trough and then discharged to the plate and frame filter press through the scum hole. The clear liquid overflows into the water blocker and enters the flotation tank through the bottom water pipe.

[0057] The front section of the flotation tank is the flotation zone. Suspended matter and pollutants in the wastewater from the skimming sedimentation tank adhere to bubbles and float to the surface, forming a scum layer. A scum scraper scrapes the scum from the pool surface into a scum tank, which then discharges it through a scum discharge pipe to a plate and frame filter press. NaOH solution is added to the bottom of the flotation zone to adjust the pH to 9, and PAC and PAM reagents are added for a full reaction to remove suspended matter and organic matter. The wastewater, free of suspended matter, passes over the baffle and comes into full contact with the composite elastic packing. After further adsorption and degradation by the biofilm attached to the packing surface, it enters the water storage area through the bottom water pipe and enters the dual-stage A+MBR tank through the upper water inlet pipe on the other side.

[0058] The first stage of the two-stage A+MBR tank consists of a primary anaerobic tank. A vortex guide tube is located in the center of the tank, surrounded by sump tanks. Sewage from the flotation tank's storage area enters the vortex guide tube through an inlet pipe, which runs diagonally downward along the tube's wall. The kinetic energy of the sewage causes it to swirl along the guide tube, creating a vortex flow that continuously rotates the anaerobic zone's wastewater in the same direction. The wastewater swirls from the top of the vortex guide tube to the bottom, creating a mixing effect with its own kinetic energy, thoroughly mixing and suspending the muddy and water before flowing out the bottom of the guide tube and upward. This vortex mixing, generated by the sewage's own kinetic energy, effectively prevents oxygen incorporation, maintaining a DO of ≤0.3 mg / L. Slurry that rises from the bottom of the guide tube flows through an overflow weir into the sump tank. From there, it flows through a water pipe connected to the MBR tank to the primary MBR tank for further treatment. The primary MBR tank is equipped with flat-plate membrane modules, which separate mud and water through efficient solid-liquid separation. Clean water enters the secondary anaerobic tank, and activated sludge is regularly discharged to the plate and frame filter press. After the clean water from the primary A+MBR is treated again in the secondary A+MBR, the activated sludge is returned to the primary anaerobic tank or regularly discharged to the plate and frame filter press, and the clean water meets discharge standards.

[0059] The plate and frame filter press regularly filters the sludge from the skimming sedimentation tank and flotation tank, and the activated sludge from the two-stage MBR tank. The filtrate is returned to the skimming sedimentation tank, and the mud cake is transported out. It can be used as an organic fertilizer and applied to the soil after a certain fermentation process. It is decomposed by microorganisms to produce carbon dioxide and water, while releasing a large amount of nitrogen, phosphorus, potassium and other elements, which can effectively improve the fertility of the soil and has a high recycling value.

[0060] When the skimmer is running, the driving motor 24 is first started to drive the transmission chain 22 to rotate synchronously through the sprocket shaft 23 at one end. When the transmission chain 22 rotates, it will drive the scraping structure 21 on the outer surface to move synchronously. After the scraping structure 21 completes a round of scraping and flips upward, the conical block 217 at the end will be restricted by the second wedge block 18. As the transmission chain 22 rotates, 281 will be squeezed and slide horizontally. At the same time, the transmission gear 221 at the squeezed end of the threaded rod 218 will be aligned with the bottom rack 19. Therefore, after the transmission gear 221 is engaged with the bottom rack 19, it will drive the threaded rod 218 to rotate. When the threaded rod 218 rotates, the threaded connection frame 2 25 will drive the self-cleaning plate 224 to slide along the outer surface of the second scraping plate 226 to the other end. At the same time, the self-cleaning plate 224 will scrape off the scum on the outer surface of the second scraping plate 226. When this set of scraping structures 21 moves to the middle of the sewage sedimentation tank 1, the transmission gear 221 at the end of the threaded rod 218 will separate from the bottom rack 19. As the scraping structure 21 continues to move, the conical block 217 at the other end of the threaded rod 218 will contact the first wedge block 16, and at the same time, the threaded rod 218 will be squeezed to slide horizontally inside the limiting slide 220, so that the transmission gear 221 at the end of the threaded rod 218 is aligned with the top rack 15 on the upper part of the side plate 14 until the transmission gear 221 is aligned with the top rack 15 on the upper part of the side plate 14. 21 is meshed with the top rack 15 at the top, so it will drive the threaded rod 218 to rotate in the opposite direction through the transmission gear 221, and at the same time the threaded rod 218 will also drive the threaded connecting frame 225 to slide in the opposite direction, so that the threaded connecting frame 225 drives the self-cleaning plate 224 to automatically clean the outer surface of the second scraper plate 226 back and forth twice. After being cleaned twice, the scraping structure 21 will be transported downward and turned over. At the same time, the first scraper plate 213 and the second scraper plate 226 will be plugged into the sewage inside the sewage sedimentation tank 1, and push the scum to move to the other end when the scraping structure 21 moves. When the scraping structure 21 scrapes the scum to one end, the scraping structure 21 will be driven to turn over, and at the same time When the first scraper plate 213 is flipped, it will contact the upper outer surface of the partition 11 inside the flotation tank 12, so the first scraper plate 213 will be restricted and squeezed, causing the first scraper plate 213 to retract and slide into the limiting slot 223 until the scum is flipped and discharged into the scum tank for collection. Then this set of scraper structures 21 will flip up again for self-cleaning, and finally circulate the scraping. Therefore, this solution reduces construction and operation costs and improves treatment efficiency by optimizing the wastewater treatment process and structure; for the skimmer, the scraper is given a self-cleaning function to avoid load-bearing overload, and the scraper structure is optimized to prevent overflow, which significantly improves the skimming efficiency and equipment stability, thereby achieving efficient and economical soy product wastewater treatment.

[0061] The above is a detailed description of an embodiment of the present invention, but the content is only a preferred embodiment of the present invention and should not be considered to limit the scope of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. An efficient treatment process for soy product processing wastewater, comprising a primary sedimentation tank, a skimming sedimentation tank, a micro-nano flotation tank, a two-stage A+MBR tank and a plate-frame filter press connected in sequence, characterized in that: The following steps are involved: S1. Collecting the acidic high-concentration organic wastewater generated by tofu processing into a regulating pond for water quality and quantity regulation; S2. The regulated wastewater flows into the skimming sedimentation tank. The flow rate is slowed down by the water blocker inside the skimming sedimentation tank. The suspended matter settles in the cone-shaped sludge settling area. After the scum passes through the skimming sedimentation tank, the sludge is sent to the plate and frame filter press. The clear liquid flows into the micro-nano flotation tank through the bottom water pipe. S3: The clear liquid enters the reaction zone of the micro-nano flotation tank. A reagent is added at the bottom of the reaction zone to adjust the pH to 9. Suspended matter, pollutants and bubbles in the wastewater adhere to form a scum layer. After being treated in the skimming sedimentation tank, it is sent to the plate and frame filter press. The wastewater with the suspended matter removed contacts the composite elastic filler and is degraded by biofilm adsorption. It then enters the water storage area through the bottom water pipe and flows into the double-stage A+MBR tank. S4. The sewage is sequentially treated in the double-stage A+MBR tank with primary anaerobic treatment, primary MBR treatment, secondary anaerobic treatment and secondary MBR treatment, and the treated clean water meets the discharge standards; S5. The plate and frame filter press filters the scum from the skimming sedimentation tank and the micro-nano flotation tank, and the activated sludge from the two-stage MBR tank. The filtrate is returned to the skimming sedimentation tank, and the mud cake is used as organic fertilizer after fermentation.

2. The high-efficiency treatment device for soy product processing wastewater according to claim 1, characterized in that: The skimming sedimentation tank comprises a sewage sedimentation tank (1) and a skimmer (2), wherein the skimmer (2) is fixedly installed on the top of the sewage sedimentation tank (1); An air flotation tank (12) is provided inside the top of the sewage sedimentation tank (1), and a partition (11) is provided at one end of the inner edge of the air flotation tank (12). Support frames (13) are fixedly installed on both sides of the top of the sewage sedimentation tank (1). The upper surfaces of the support frames (13) on both sides of the top of the sewage sedimentation tank (1) are respectively fixedly connected with side plates (14), and one end of the two groups of side plates (14) is respectively fixedly connected with a first wedge block (16) and a second wedge block (18). The side plates (14) on one side of the top of the sewage sedimentation tank (1) are fixedly connected. ) is fixedly connected to a top rack (15) on the upper side, and a bottom rack (19) is fixedly connected to the upper surface of the support frame (13) on the other side of the top of the sewage sedimentation tank (1), and the top rack (15) and the bottom rack (19) are both close to the central side of the sewage sedimentation tank (1), and the top rack (15) and the side plate (14) are located at one end of the sewage sedimentation tank (1), and the bottom rack (19) and the side plate (14) are located at the other end of the sewage sedimentation tank (1), and there is no overlapping part in the middle in the horizontal direction.

3. The high-efficiency treatment device for soy product processing wastewater according to claim 1, characterized in that: The slag skimmer (2) comprises a sprocket shaft (23), the outer surfaces of both ends of the sprocket shaft (23) are meshed with transmission chains (22), the outer surface of the transmission chain (22) is fixedly connected to a slag scraping structure (21), and one end of the sprocket shaft (23) is fixedly connected to a driving motor (24); The scraping structure (21) comprises a self-cleaning component (212), a scraping component (211) is movably plugged into the top of the self-cleaning component (212), the scraping component (211) comprises a first scraping plate (213), a plug-in rod (214) is slidably plugged into the bottom of the first scraping plate (213), a return spring (216) is sleeved on the outer surface of the plug-in rod (214), and limiting blocks (215) are evenly arranged on both sides of the bottom of the scraping component (211).

4. The high-efficiency treatment device for soy product processing wastewater according to claim 2, characterized in that: The self-cleaning assembly (212) includes a connecting base (219), a second scraper plate (226) is fixedly mounted on the top of the connecting base (219), a limiting slideway (220) is provided on the side of the connecting base (219), a threaded connecting frame (225) is slidably engaged with the interior of the limiting slideway (220), and self-cleaning plates (224) are fixedly connected to the outer surfaces of both sides of the threaded connecting frame (225); The middle part of the threaded connection frame (225) is threadedly connected to a threaded rod (218), and the outer surfaces of both ends of the threaded rod (218) are fixedly mounted with transmission gears (221). The center of the outer side surface of the transmission gear (221) is fixedly connected to the rear conical block (217), and the side surface of the second scraper plate (226) is evenly provided with limiting sliding grooves (222), and the top center of the second scraper plate (226) is provided with a limiting slot (223).

5. The high-efficiency treatment device for soy product processing wastewater according to claim 3 is characterized in that: The two ends of the sprocket shaft (23) are rotatably engaged with the two end side surfaces of the sewage sedimentation tank (1) through limiting sleeves (17), and the driving motor (24) is fixedly connected to the outer side surface of one end of the sewage sedimentation tank (1).

6. The high-efficiency treatment device for soy product processing wastewater according to claim 4, characterized in that: The threaded rod (218) is movably abutted against the outer surfaces of the side plate (14), the first wedge block (16) and the second wedge block (18) through the tapered blocks (217) at both ends, and the threaded rod (218) is meshedly connected with the top rack (15) and the bottom rack (19) through the transmission gears (221) at both ends.

7. The high-efficiency treatment device for bean product processing wastewater according to claim 5, characterized in that: The self-cleaning component (212) is movably connected to the top of the partition (11) through the scraping component (211), the scraping component (211) is slidably connected to the top of the second scraping plate (226) through the limiting slot (223), the scraping component (211) is slidably connected to the limiting slide (222) through the limiting blocks (215) on both sides, and the bottom end of the plug rod (214) is fixedly connected to the inner bottom surface of the limiting slot (223).

8. The high-efficiency treatment device for soy product processing wastewater according to claim 6, characterized in that: The top of the partition (11) is wedge-shaped, the self-cleaning plate (224) and the outer surfaces of both sides of the second scraper plate (226) are slidably engaged, and the two ends of the threaded rod (218) are slidably plugged into the two ends of the connecting base (219).

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