A domestic tofu workshop wastewater treatment and purification device

Abstract

The application discloses a household tofu workshop wastewater treatment and purification device, which comprises a first filtering device, a power conveying device, a second filtering device connected with the first filtering device and a third filtering device connected with the second filtering device. The first filtering device comprises a first filter screen and a second filter screen. The second filtering device comprises a first anaerobic reaction layer and a second anaerobic reaction layer. The third filtering device comprises a membrane assembly. The household tofu workshop wastewater treatment and purification device can realize the purpose of filtering and purifying by filtering the wastewater generated in the tofu production through the first filtering device, the second filtering device and the third filtering device for multiple times, so as to filter the particulate suspended matter in the wastewater and the organic nutrient substances in the wastewater, thereby avoiding the pollution to the external environment caused by the discharge.

Description

Technical Field

[0001] This utility model belongs to the technical field of wastewater treatment equipment, and in particular, it is a wastewater treatment and purification device for household tofu workshops. Background Technology

[0002] Tofu making has a long history in my country, and small-scale family workshops remain common in rural areas and even towns. However, wastewater from these workshops is often discharged directly into open channels or pipe networks without effective treatment, causing significant damage to the surrounding environment. Currently, there are many treatment devices for tofu wastewater, generally using physical, chemical, and biological methods to remove harmful substances and meet discharge standards. However, these devices typically include multiple components, such as pretreatment equipment, biological treatment equipment, and filtration equipment. These devices only filter out the residue in the wastewater, not the microorganisms. Because tofu production wastewater is rich in nutrients, its discharge can lead to eutrophication of water bodies.

[0003] For example, in the utility model patent with publication number CN216890554U, the purification treatment is still incomplete because it only uses multiple sets of filter plates to filter the tofu residue and suspended solids in the wastewater. Summary of the Invention

[0004] In view of this, the present invention provides a household tofu workshop wastewater treatment and purification device to solve the above problems.

[0005] A wastewater treatment and purification device for a household tofu workshop includes a first filtration device for physically filtering particulate matter in wastewater generated during tofu production, and a second filtration device connected to the first filtration device for anaerobic treatment of organic matter in the waste pre-filtered by the first filtration device. The first filtration device includes a filter assembly comprising a first filter screen and a second filter screen located on the ground-facing side of the first filter screen. The first and second filter screens are used to filter suspended solids in the wastewater, with the pore size of the first filter screen being larger than that of the second filter screen. The second filtration device includes a transport pipe connected to the bottom sidewall of the first filtration device for conveying the wastewater filtered by the first filtration device to the second filtration device, a filter device connected to the transport pipe for filtering the wastewater transported by the transport pipe, and a discharge device connected to the filter device. The second filtration device includes a first anaerobic reaction layer connected to the transport pipe and a second anaerobic reaction layer located on the side of the first anaerobic reaction layer away from the ground. Both the first and second anaerobic reaction layers contain sludge for anaerobic treatment of organic matter in the waste filtered by the first filtration device. The sludge particle size in the first anaerobic reaction layer is larger than that in the second anaerobic reaction layer. The discharge device includes a liquid discharge device connected to the filtration device, which includes an outlet pipe for discharging harmless water filtered by the second filtration device. The wastewater is treated by the second filtration device to remove nutrients before discharge, thus avoiding eutrophication caused by direct discharge.

[0006] Furthermore, the wastewater treatment and purification device for a household tofu workshop also includes a power transmission device for providing power, and a third filtration device connected to the second filtration device for aerobic treatment of the organic matter in the waste filtered by the second filtration device. The outlet pipe is connected to the upper side wall of the third filtration device. The power transmission device includes multiple water pumps, which are connected to a liquid delivery pipe inside the treatment and purification device to provide power support. The third filtration device includes a filter tank, at least one filter assembly connected to the outlet pipe and disposed in the filter tank, multiple aeration devices placed in the filter tank, and a device connected to the... The filtration tank is connected to an outlet pipe. The aeration device is used for aerobic treatment of organic matter in the wastewater in the filtration tank. The filtration assembly includes multiple membrane modules disposed on the filtration assembly. Each membrane module includes a guide pipe connected to the outlet pipe, a membrane bioreactor located in the filtration tank, and a manifold connected to the filtration tank. One end of the manifold is connected to the filtration tank, and the other end is connected to the outlet pipe. The membrane bioreactor is used for filtering and adsorbing small microorganisms in the wastewater. The aeration device is used for aerobic treatment of organic matter in the waste filtered by the second filtration device. The outlet pipe is connected to the manifold.

[0007] Furthermore, the first filtering device also includes four supports, and the filter assembly also includes a handle. The four supports are perpendicular to the horizontal ground and vertically arranged around the filter assembly to support the filter assembly. The handle is used to facilitate the removal and placement of the first filter and the second filter, and the handle is connected to a traction rope.

[0008] Furthermore, the transport pipe includes a transport pipe body connected to the bottom side wall of the first filter device, and a plurality of anti-clogging components built into the transport pipe body. Each anti-clogging component includes a support pipe connected to the transport pipe body, two fixing parts disposed in the support pipe, and an anti-clogging valve disposed on the fixing parts. The anti-clogging valve includes an upper valve, a nozzle connected to the upper valve, a valve body connected to the nozzle, and a lower valve connected to the valve body.

[0009] Furthermore, the filtration device also includes multiple first inclined tubes connected at one end to the first anaerobic reaction layer and at the other end to the second anaerobic reaction layer, a clarification zone located on the side of the second anaerobic reaction layer away from the ground, multiple second inclined tubes connected at one end to the second anaerobic reaction layer and at the other end to the clarification zone, and an outer tank. The inclination angle of the first inclined tubes is 75-90°, the inclination angle of the second inclined tubes is 45-60°, the aperture of the second inclined tubes is smaller than the aperture of the first inclined tubes, and the length of the second inclined tubes is greater than the length of the first inclined tubes. The clarification zone includes multiple guide vanes connected to the second inclined tubes and multiple three-phase separators connected to the guide vanes. The guide vanes guide the wastewater passing through the second inclined tubes into the three-phase separators. The three-phase separators separate and filter the wastewater entering the three-phase separators. An observation hole is provided outside the second anaerobic reaction layer for observing the sludge content in the second anaerobic reaction layer.

[0010] Furthermore, the second filtration device also includes a circulation device, which includes an inner circulation pipe connected to the first anaerobic reaction layer and the second anaerobic reaction layer, a dilution circulation pipe connected to the three-phase separator, and an outer circulation pipe connected to the second anaerobic reaction layer. The inner circulation pipe is used to transport sludge from the second anaerobic reaction layer to the first anaerobic reaction layer. The dilution circulation pipe is used to transport wastewater that has been separated and filtered by the three-phase separator to the first filtration device, so as to reduce the concentration of nutrients in the wastewater of the first filtration device while cleaning the first filtration device. The outer circulation pipe is connected to the third filtration device and is used to transport sludge into the second anaerobic reaction layer.

[0011] Furthermore, the emission device also includes a gas emission device connected to the three-phase separator, and an vent pipe. The gas emission device includes at least one exhaust pipe connected to the three-phase separator for discharging air, and multiple air filter layers connected to the exhaust pipe for deodorizing the putrid particles in the gas carried in the wastewater.

[0012] Furthermore, the power delivery device also includes multiple air pumps and a control assembly connected to the water pump and the air pump. The air pumps are used to supply air to the third filtration device, and the control assembly is used to perform circuit control on the operating status of the water pump and the air pump. The control assembly includes multiple flow rate adjustment knobs connected to the water pump and multiple air volume adjustment knobs connected to the air pump. Each flow rate adjustment knob is used to adjust the liquid flow rate delivered by the water pump corresponding to the flow rate adjustment knob, and each air volume adjustment knob is used to adjust the gas flow rate delivered by the air pump corresponding to the air volume adjustment knob.

[0013] Furthermore, the third filtration device also includes a sludge inlet disposed within the filtration tank, and multiple drain pipes disposed at the bottom of the filtration tank for discharging waste from the filtration tank.

[0014] Furthermore, the aeration device is connected to the air volume adjustment knob, and the oxygen delivery rate and amount to the aeration device are adjusted via the air volume adjustment knob.

[0015] Compared with existing technologies, the wastewater treatment and purification device for household tofu workshops provided by this utility model physically filters suspended waste in the wastewater through the first and second filter screens, aerobically treats organic matter in the wastewater through the first and second anaerobic reaction layers, filters fine microorganisms in the wastewater through the membrane module, and anaerobically treats microorganisms in the wastewater through the aeration equipment. Finally, the wastewater is discharged through the effluent pipe to avoid pollution of the external environment. This utility model achieves the purpose of harmless treatment of wastewater generated by household tofu workshops through multiple filtration measures, reducing the impact of the production process on the external environment. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the household tofu workshop wastewater treatment and purification device provided by this utility model.

[0017] Figure 2 for Figure 1 A schematic diagram of the structure of the first filtration device in the wastewater treatment and purification device.

[0018] Figure 3 for Figure 1 A schematic diagram of the structure of the second filtration device in the wastewater treatment and purification device.

[0019] Figure 4 for Figure 3 A schematic diagram of the anti-clogging component of the second filter device.

[0020] Figure 5 for Figure 1 A schematic diagram of the structure of the membrane module in the filtration assembly. Detailed Implementation

[0021] The specific embodiments of this utility model are described in further detail below. It should be understood that the description of the embodiments of this utility model herein is not intended to limit the scope of protection of this utility model.

[0022] like Figures 1 to 5The diagram shown is a structural schematic of a wastewater treatment and purification device for a household tofu workshop provided by this utility model. The device includes a first filter 10 for physically filtering waste generated during tofu workshop production, a second filter 20 connected to the first filter 10 for treating the waste filtered by the first filter 10, a power transmission device 30 for providing power, and a third filter 40 connected to the second filter 20 for treating the waste filtered by the second filter 20. The device also includes other functional modules, such as fixing devices, pipe connection components, electrical connection components, etc., which are technologies known to those skilled in the art and will not be described in detail here.

[0023] like Figure 2 As shown, the first filter device 10 includes four supports 11 located within the first filter device 10, and a filter assembly 12 mounted in the four supports 11.

[0024] The four supports 11 are vertically arranged around the filter assembly 12, perpendicular to the horizontal ground, and serve to support the filter assembly 12. The four supports 11 are parallel to each other and can be arranged in a rectangular pattern. The supports 11 can be made of stainless steel to prevent corrosion.

[0025] The filter assembly 12 includes a handle 13, a first filter 14 located on the side of the handle 13 near the ground, and a second filter 15 located on the side of the first filter 14 near the ground. The filter assembly 12 also includes a rectangular frame with four grooves having locking mechanisms, thereby allowing the position of the rectangular frame on the bracket 11 to be adjusted.

[0026] The handle 13 is fixedly mounted on the rectangular frame and is used to facilitate the removal and placement of the first filter screen 12 and the second filter screen 13. When there are too many filtered impurities on the first filter screen 12 and the second filter screen 13, the handle 13 can be lifted to remove the first filter screen 12 and the second filter screen 13 and empty the impurities.

[0027] The handle 13 is composed of six steel members connected in pairs to form a closed rectangular frame. The handle 13 can be welded to the rectangular frame. In use, the handle 13 can be connected to a traction rope 100, which is equipped with a hook. The hook is used to hook the handle 13, and the rectangular frame is lifted from the first filter device 10 by the traction rope 100.

[0028] The first filter screen 14 and the second filter screen 15 are used to filter solid particulate matter in wastewater. The first filter screen 14 and the second filter screen 15 can be made of fiber material into a funnel shape, and are fixed to the rectangular frame on all four sides. The holes in the funnel-shaped screen are used to filter impurities, while the sides are enclosed to prevent surrounding impurities from entering and contaminating the impurities to be filtered. The top surface is uncovered to facilitate the addition of feed. The distance between the first filter screen 14 and the second filter screen 15 can be adjusted as needed when the rope is wound around and connected to the rectangular frame.

[0029] The pore size of the first filter screen 14 can be 0.8 mm.

[0030] The second filter screen 15 can have a pore size of 0.5 mm to further filter impurities that the first filter screen 14 cannot filter.

[0031] like Figure 3 As shown, the second filtration device 20 includes a transport pipe 21 connected to the bottom sidewall of the first filtration device 10, a filter device 22 connected to the transport pipe 21 and used to filter the waste transported by the transport pipe 21, a circulation device 23 located within the second filtration device 20, and a discharge device 24 connected to the filter device 22. It is easy to see that the upper sidewall of the second filtration device 20 also has a water inlet for injecting water into the second filtration device 20 to clean it.

[0032] The transport pipe 21 includes a transport pipe body 211 connected to the bottom side wall of the first filter device 10, and a plurality of anti-clogging components 212 built into the transport pipe body 211.

[0033] The transport pipe body 211 is used to send the waste filtered by the first filter device 10 into the filter device 22 for further filtration.

[0034] like Figure 4As shown, each of the anti-blocking components 212 includes a support pipe 213 connected to the transport pipe body 211, two fixing parts 214 disposed in the support pipe 213, and an anti-blocking valve 215 mounted on the fixing part 214.

[0035] The support tube 213 is used to house the anti-clogging valve 215, with one end connected to the transport tube body 211 and the other end connected to the filter device 22.

[0036] The fixing part 214 has a ring structure and is used to fix the anti-blocking valve 215. Specifically, when no material passes through, the anti-blocking valve 215 is mounted on the support pipe 213 and is supported and fixed by the fixing part 214.

[0037] The anti-clogging valve 215 is a rotary component, which includes an upper valve 2151, a nozzle 2152 connected to the upper valve 2151, a valve body 2153 connected to the nozzle 2152, and a lower valve 2154 connected to the valve body 2153.

[0038] A flow gap 216 for water flow is formed between the anti-clogging valve 215 and the support pipe 213. Specifically, when no water flows through, the nozzle 2152 is mounted on the fixing part 214. When waste enters the transport pipe body 211 and flows through the support pipe 213, the waste exerts an upward pressure on the nozzle 2152 under the pressure of the water pump 31. When the pressure is greater than the weight of the anti-clogging valve 215 and the pressure of the material in the second filter device 20 on the anti-clogging valve 215, the waste will push the nozzle 2152 open. At this time, the waste will pass through the filter gap 216 and through the nozzle 2152 into the filter device 22. When no waste passes through, the anti-clogging valve 215 will block the connection outlet between the support pipe 213 and the filter device 22, preventing particles in the first anaerobic reaction layer 221 from entering the transport pipe 21 and causing blockage. When treating purified wastewater, it is also possible to observe whether wastewater is surging up through the observation hole 234. If not, it may be due to excessive water flow velocity leading to excessive water pressure, causing the lower valve 2154 to rise and jam the fixing part 214 when the water flow pushes up the anti-clogging valve 215. At this time, the working power of the water pump 31 can be adjusted by adjusting the flow rate adjustment knob 331 to reduce the wastewater flow velocity and reduce the water flow pressure, thereby allowing the water to flow normally.

[0039] like Figure 3As shown, the filtration device 22 includes a first anaerobic reaction layer 221 connected to the transport pipe body 211 for filtering large particles in the waste; a second anaerobic reaction layer 222 located on the side of the first anaerobic reaction layer 221 away from the ground for filtering small particles in the waste; multiple first inclined tubes 223 connected at one end to the first anaerobic reaction layer 221 and at the other end to the second anaerobic reaction layer 222; a clarification zone 224 located on the side of the second anaerobic reaction layer 222 away from the ground for collecting wastewater filtered by the first anaerobic reaction layer 221 and the second anaerobic reaction layer 222; and multiple second inclined tubes 225 connected at one end to the second anaerobic reaction layer 222 and at the other end to the clarification zone 224. It is understood that the filtration device 22 also includes an outer tank 226, with the first anaerobic reaction layer 221 located at the bottom of the outer tank 226. The second anaerobic reaction layer 222, the first inclined tube 223, and the second inclined tube 225 are each independent modules, which can be inserted and fixed in the outer tank 226 like drawers, thus facilitating fixation, replacement, and cleaning. The material in the second anaerobic reaction layer 222 is also placed in a frame and set in the outer tank 226. The first inclined tube 223 and the second inclined tube 225, consisting of multiple tubes arranged in a frame and set in the outer tank 226, are fixed in place. The clarification zone 224 is located at the top of the outer tank 226. The first anaerobic reaction layer 221 and the second anaerobic reaction layer 222 are part of an upflow anaerobic sludge bed. An upflow anaerobic sludge bed is a highly efficient anaerobic bioreactor. When the reactor is working, wastewater enters the bottom of the reactor through a uniform water distribution system, and the wastewater flows from bottom to top through the anaerobic sludge bed reactor. This is an existing technology and will not be described in detail here. The first anaerobic reaction layer 221 is located at the bottom of the second filtration device 20. It is a granular sludge bed. The sludge in the first anaerobic reaction layer 221 is large-particle sludge with a concentration of 50-70 g / L and a particle size of 1-5 mm. The microbial composition of the granular sludge includes bacilli, cocci, and filamentous bacteria. The large-particle sludge in the first anaerobic reaction layer 221 can not only precipitate and filter impurities in wastewater, but the microorganisms in the large-particle sludge can also degrade organic matter in wastewater to consume nutrients, thereby achieving the purpose of anaerobic treatment.

[0040] The second anaerobic reaction layer 222 can be a sludge suspension layer, and the sludge in the second anaerobic reaction layer 222 is small-particle sludge with a concentration of 10-30 g / L and a particle size of less than 1 mm. The second anaerobic reaction layer 222 is composed of highly flocculated sludge, and the sludge concentration in the second anaerobic reaction layer 222 gradually decreases from the first anaerobic reaction layer 221 toward the second anaerobic reaction layer 222. Because the concentration of small-particle sludge is lower and the particle size is smaller than that of large-particle sludge, the settling velocity of small-particle sludge is slower than that of large-particle sludge, that is, the settling velocity of the second anaerobic reaction layer 222 is slower than that of the first anaerobic reaction layer 221. The microorganisms in the sludge in the second anaerobic reaction layer 222 can also consume and decompose the abundant nutrients in the tofu wastewater during the wastewater filtration process. The sludge in the second anaerobic reaction layer 221 is in a suspended state during operation, floating in the liquid in the second filter device 20 and being impacted by the upward flow of water, so it will not fall into the first anaerobic reaction layer 221.

[0041] Both the first inclined tube 223 and the second inclined tube 225 are inclined tubes. Inclined tubes are widely used in water supply and drainage engineering, mainly for water treatment devices such as water supply sedimentation, sewage sedimentation, and oil separation. This should be considered existing technology. The first inclined tube 223, located between the first anaerobic reaction layer 221 and the second anaerobic reaction layer 222, has an inclination angle of 75-90°. The first inclined tube 223 can be a medium-inclined tube. When large and small particulate sludge particles in the wastewater flow through the first inclined tube 223, due to the different settling velocities of the large and small particulate sludge particles, the wastewater will form stratification in the first inclined tube 223. That is, the first inclined tube 223 forms a buffer and separation between the large and small particulate sludge particles. It is not hard to imagine that a support frame is also installed below the first inclined tube 223 on the outer barrel 226 to support the first inclined tube 223 and prevent the inclined tube 223 from sinking into the first anaerobic reaction layer 221 due to gravity.

[0042] The clarification zone 224 further includes at least one guide vane 2241 fixed to the second filter device 20 and at least one three-phase separator 2242 connected to the guide vane 2241. The guide vane 2241 and the three-phase separator 2242 are both fixedly mounted on the side wall of the outer barrel 226.

[0043] The guide vane 2241 is fixedly installed on the side wall of the outer tank 226 and is used to guide the wastewater flowing out of the first inclined tube 223 so that it enters the three-phase separator 2242 along the guide vane 2241.

[0044] The three-phase separator 2242 is fixedly installed on the top of the outer tank 226. It is a device for separating oil, gas, and water in a fluid and accurately measuring its output. This is existing technology and will not be described in detail here. The three-phase separator 2242 is used to separate solids, liquids, and gases in the wastewater entering the three-phase separator 2242. The three-phase separator 2242 is also equipped with a water quality detector and a valve for controlling the flow of filtered water within the three-phase separator 2242. When the water quality detector detects that the nutrient content in the filtered water is still too high, the filtered water flows into the first filter device 10 for re-filtration through the dilution circulation pipe 232. When the nutrient content in the filtered water meets the standard, the filtered water flows into the third filter device 30 through the outlet pipe 2421 for further processing.

[0045] The second inclined tube 225, located on the side of the second anaerobic reaction layer 222 away from the ground, has an inclination angle of 46-60°. The second inclined tube 225 can be a micro-inclined tube, with a smaller pore size than the first inclined tube 223 and a longer length than the first inclined tube 223. The smaller pore size of the second inclined tube 225 allows for further fine filtration of the wastewater entering the second anaerobic reaction layer 222, and its longer length allows for a longer path for sludge in the wastewater to flow, providing more distance for sedimentation. Therefore, compared to the first inclined tube 223, the second inclined tube 225 has a stronger sedimentation effect. The second inclined tube 225 is also mounted within the outer tank 226, which has a support frame fixed to its side wall to support the second inclined tube 225 and prevent it from sinking due to gravity. The second inclined tube 225 can be inserted into the outer tub 226 like a drawer. It is easy to imagine that, with prolonged use, the first inclined tube 223 and the second inclined tube 225 in the filter device 22 will inevitably accumulate impurities in the gaps of the filter device 22, causing blockages. In this case, simply injecting water into the second filter device 20 through the water inlet will cause the water to fall under gravity, clearing the blockages and allowing the filter device 22 to continue operating.

[0046] The circulation device 23 is used to circulate and filter the sludge and wastewater in the second filtration device 20. It includes an inner circulation pipe 231 connected to the first anaerobic reaction layer 221 and the second anaerobic reaction layer 222, a dilution circulation pipe 232 connected to the three-phase separator 2242, and an outer circulation pipe 233 connected to the second anaerobic reaction layer 222.

[0047] The internal circulation pipe 231 is used to transport small particulate sludge from the second anaerobic reaction layer 222 in the filter device 22 to the first anaerobic reaction layer 221. One end of the internal circulation pipe 231 is connected to the second anaerobic reaction layer 222, and the other end is connected to the first anaerobic reaction layer 221. This small particulate sludge will re-enter the second anaerobic reaction layer 222 with the upward movement of the wastewater, while the large particulate sludge in the first anaerobic reaction layer 221 will not be swept upwards by the water flow due to its greater gravity. Thus, the small particulate sludge in the second anaerobic reaction layer 222 and the small particulate sludge settled in the wastewater achieve internal circulation. The internal circulation pipe 231 keeps the sludge microorganisms in the first anaerobic reaction layer 221 and the second anaerobic reaction layer 222 in an active state, thereby increasing the reaction rate between the microorganisms and the organic nutrients in the wastewater.

[0048] The dilution circulation pipe 232 is installed on the top side wall of the outer tank 226 and is used to dilute the nutrients in the wastewater entering the first filter device 10. One end of the dilution circulation pipe 232 is connected to the three-phase separator 2242, and the other end is connected to the upper side wall of the first filter device 10. The dilution circulation pipe 232 is used to transport the filtered clean water source in the clarification zone 224 to the first filter device 10 to mix with the original wastewater in the first filter device 10, so as to reduce the concentration of nutrients in the wastewater and prevent excessive nutrients in the wastewater from causing eutrophication of the water body during later discharge. In addition, after the first filter device 10 has completed filtration, the filtered clean water can also be used to clean the first filter screen 12 and the second filter screen 13 in the first filter device 10.

[0049] One end of the external circulation pipe 233 is connected to the second anaerobic reaction layer 222, and the other end is connected to the sludge settling layer 44 described below. It is easy to imagine that the second anaerobic reaction layer 222 cannot achieve 100% filtration; small particles of sludge in the second anaerobic reaction layer 222 may still enter the third filtration device 30 through the second inclined pipe 225, the clarification zone 224, and the outflow pipe 2421. Over time, the sludge in the second anaerobic reaction layer 222 will decrease, thus affecting the normal progress of the reaction. Therefore, it is necessary to transport sludge from the sludge settling tank 44 to the second anaerobic reaction layer 222 through the external circulation pipe 233 to replenish the sludge in the second anaerobic reaction layer 222.

[0050] The circulation device 23 also includes an observation hole 234 on the side wall of the second anaerobic reaction layer 222. This observation hole 234 is used to observe the sludge deposition inside the second anaerobic reaction layer 222 during operation, allowing for the injection or discharge of sludge into or out of the second anaerobic reaction layer 222 as needed. It also facilitates observation of whether the sludge inside the second anaerobic reaction layer 222 has been completely emptied when the wastewater treatment and purification device is shut down and the internal sludge needs to be drained.

[0051] Waste entering the transport pipe 21 will flow sequentially through the first anaerobic reaction layer 221, the first inclined tube 223, the second anaerobic reaction layer 222, and the second inclined tube 225 under the power provided by the power conveying device 30, and finally enter the clarification zone 224. During the process of the waste flow through the second filtration device 20, the particulate matter in the waste will settle on the first anaerobic reaction layer 221, the first inclined tube 223, the second anaerobic reaction layer 222, and the second inclined tube 225 according to its different particle size and sedimentation capacity, so as to form stratification.

[0052] The discharge device 24 is located on the top of the outer tank 226 and includes a gas discharge device 241 connected to the clarification zone 224, a liquid discharge device 242 connected to the clarification zone 224, and a vent pipe 243 located at the bottom of the second filter device.

[0053] The gas emission device 241 includes at least one exhaust pipe 2411 connected to the three-phase separator 2242 and an air filter layer 2412 connected to the exhaust pipe 2411.

[0054] The exhaust pipe 2411 is used to transport the gas separated by the three-phase separator 2242.

[0055] The air filter layer 2412 is used to deodorize and adsorb the gas passing through the exhaust pipe 2411, so as to prevent the putrid particles contained in the gas from being directly emitted into the air and causing harm to the environment. The air filter layer 2412 can use built-in multi-layer adsorption fillers, such as activated carbon or other biological deodorizing fillers, to deodorize and adsorb the gas.

[0056] The liquid discharge device 242 includes an outlet pipe 2421 connected to the three-phase separator 2242.

[0057] The outlet pipe 2421 is used to transport the water filtered by the second filter device 20 to the third filter device 30. The outlet pipe 2421 passes through the side wall of the third filter device 40 and is connected to the guide pipe 4211 described below.

[0058] The vent pipe 243 is located at the bottom of the outer barrel and is used to discharge water and sludge from the second filter device 20. Specifically, when the purification device is not in use, the water and sludge in the second filter device 20 need to be discharged. At this time, water can be injected into the water inlet to allow water to flow through the various components inside the second filter device 20, washing away the attached impurities during cleaning. The sewage and impurities finally collect at the bottom of the second filter device 20 and are discharged through the vent pipe 243.

[0059] The power transmission device 30 includes a plurality of water pumps 31 (only one is shown in the figure for illustration) connected to the second filter device 20 and the third filter device 40, a plurality of air pumps 32 (only one is shown in the figure for illustration) connected to the third filter device 40, and a set of control components 33 connected to the water pumps 31 and the air pumps 32.

[0060] The water pump 31 is used to provide power to the water pipes in the second filter device 20 and the third filter device 40. Specifically, it is used to provide power to the transport pipe 21, the inner circulation pipe 231, the dilution circulation pipe 232, the outer circulation pipe 233, and the outlet pipe 2421 in the second filter device 20.

[0061] The air pump 32 is used to supply air to the third filter device 40 to ensure that the oxygen concentration in the third filter device 40 is constant.

[0062] The control component 33 is used to control the operating status of the water pump 31 and the air pump 32 via circuit. The control component 33 includes a plurality of flow adjustment knobs 331 connected to the water pump 31 (only one is shown in the figure for illustration), and a plurality of air volume adjustment knobs 332 connected to the air pump 32 (only one is shown in the figure for illustration).

[0063] Each of the flow adjustment knobs 331 is used to adjust the flow rate of the liquid delivered by the water pump 31 corresponding to the flow adjustment knob 331, and thereby adjust the speed at which the liquid transport pipe body connected to the water pump 31 delivers the liquid according to actual needs.

[0064] Each of the gas volume adjustment knobs 332 is used to adjust the gas flow rate delivered by the gas pump 32 corresponding to the gas volume adjustment knob 332, and thereby adjust the speed at which the gas transport pipe body connected to the gas pump 32 delivers gas according to actual needs.

[0065] The third filtration device 40 includes a filtration tank 41, at least one filter assembly 42 connected to the outlet pipe 2421 and disposed in the filtration tank 41, a plurality of aeration devices 43 placed in the filtration tank 41, a sludge inlet 44 disposed in the filtration tank 41, a water outlet pipe 45 connected to the filter assembly 42, and a plurality of drain pipes 46 disposed at the bottom of the filtration tank 41.

[0066] like Figure 5 As shown, the filtration assembly 42 is used to further filter the wastewater flowing in from the effluent pipe 2421. The filtration assembly 42 includes a plurality of membrane modules 421 disposed on the filtration assembly 42. Each membrane module 421 includes a guide pipe 4211 connected to the effluent pipe 2421, a membrane bioreactor 4212 located in the filtration tank 41, and a manifold 4213 connected to the filtration tank 41.

[0067] The guide pipe 4211 is used to deliver the water transported through the outlet pipe 2421 to the filter tank 41 and extend out of the membrane bioreactor 4212.

[0068] The membrane bioreactor 4212 is used to re-filter the wastewater flowing into the filter tank 41. It mainly utilizes membrane separation equipment to remove activated sludge and macromolecular organic matter from the water; this is existing technology and will not be described in detail here. The membrane bioreactor 4212 is installed in the filter tank 41. When the water in the filter tank 41 submerges part of the membrane bioreactor 4212, the membrane bioreactor 4212 filters it. The filtered water overflows and flows into the manifold 4213 before being discharged.

[0069] One end of the manifold 4213 is located inside the filter tank 41, and the other end is connected to the effluent pipe 45. It is used to transport wastewater filtered by the membrane bioreactor 4212 to the effluent pipe 45 under the action of the water pump 31. The height of the manifold 4213 opening is higher than the height of the membrane bioreactor 4212, thereby ensuring that all water entering the manifold 4213 has been filtered by the membrane bioreactor 4212.

[0070] The aeration device 43 is a prior art technology used to provide dissolved oxygen to the activated sludge microorganisms in the wastewater flowing into the filter tank 41, meeting their oxygen requirements during metabolism, thereby performing aerobic treatment of the organic matter in the wastewater. Aeration can also agitate the wastewater, keeping the organic matter in the filter tank 41 in an active state. The aeration device 43 is connected to the air volume adjustment knob 332, which adjusts the oxygen delivery rate and volume. The aeration device 43 can perform aerobic treatment of the wastewater flowing out of the outlet pipe 2421 through uniform aeration and dissolved oxygen adjustment, with the dissolved oxygen concentration generally controlled between 3 mg / L and 6 mg / L.

[0071] The sludge inlet 44 is connected to the external circulation pipe 233 and is used to transport the sludge in the filter tank 41 to the second anaerobic reaction layer 222 as needed, so as to ensure that the sludge concentration in the second anaerobic reaction layer 222 is in a balanced state.

[0072] The outlet pipe 45 is used to discharge wastewater from the filter tank 41 after being filtered by the filter assembly 42. The outlet pipe 45 is connected to the manifold 4213 and is used to discharge clean water that has been filtered by the membrane bioreactor 4212 and aerobically treated by the aeration device 20, thereby avoiding water pollution to the external environment.

[0073] The drain pipe 46 is used to drain the sludge and residue in the filter tank 41 when the wastewater purification treatment device is not in use. The drain pipe 46 is connected to the bottom of the filter tank 41. When the wastewater purification treatment device needs to be idle, the sludge and water in the filter tank 41 are drained through the drain pipe 46 to prevent the sludge from drying and clogging the pipe, which would affect subsequent use.

[0074] Compared with existing technologies, the wastewater treatment and purification device for household tofu workshops provided by this utility model physically filters suspended waste in the wastewater through the first filter screen 12 and the second filter screen 13, aerobically treats the organic matter in the wastewater through the first anaerobic reaction layer 221 and the second anaerobic reaction layer 222, filters the fine microorganisms in the wastewater through the membrane module 421, and anaerobically treats the microorganisms in the wastewater through the aeration device 43. Finally, the wastewater is discharged through the outlet pipe 2421 to avoid pollution of the external environment. This utility model achieves the purpose of harmless treatment of wastewater generated by household tofu workshops through multiple filtration measures, reducing the impact of the production process on the external environment.

[0075] The above are merely preferred embodiments of the present utility model and are not intended to limit the scope of protection of the present utility model. Any modifications, equivalent substitutions or improvements within the spirit of the present utility model are covered within the scope of the claims of the present utility model.

Claims

1. A wastewater treatment and purification device for household tofu workshops, characterized in that: The wastewater treatment and purification device for a household tofu workshop includes a first filtration device for physically filtering particulate matter in the wastewater generated during tofu workshop production, and a second filtration device connected to the first filtration device for anaerobic treatment of organic matter in the waste that has passed through the first filtration device for preliminary filtration. The first filtration device includes a filter screen assembly comprising a first filter screen and a second filter screen located on the side of the first filter screen closer to the ground. The first and second filter screens are used to filter suspended solids in the wastewater. The pore size of the first filter screen is larger than that of the second filter screen. The second filtration device includes a transport pipe connected to the bottom sidewall of the first filtration device for conveying the wastewater filtered by the first filtration device to the second filtration device, and a transport pipe connected to the transport pipe for conveying the wastewater. The system includes a filtration device for filtering wastewater and a discharge device connected to the filtration device. The second filtration device comprises a first anaerobic reaction layer connected to the transport pipe and a second anaerobic reaction layer located on the side of the first anaerobic reaction layer away from the ground. Both the first and second anaerobic reaction layers contain sludge for anaerobic treatment of organic matter in the waste filtered by the first filtration device. The sludge particle size in the first anaerobic reaction layer is larger than that in the second anaerobic reaction layer. The discharge device comprises a liquid discharge device connected to the filtration device and includes an outlet pipe for discharging harmless water filtered by the second filtration device. The wastewater is treated by the second filtration device to remove nutrients before discharge, thus avoiding eutrophication caused by direct discharge.

2. The household tofu workshop wastewater treatment and purification device as described in claim 1, characterized in that: The wastewater treatment and purification device for a household tofu workshop also includes a power transmission device for providing power, and a third filtration device connected to the second filtration device for aerobic treatment of organic matter in the waste filtered by the second filtration device. The outlet pipe is connected to the upper side wall of the third filtration device. The power transmission device includes multiple water pumps, which are connected to a liquid delivery pipe inside the treatment and purification device to provide power support. The third filtration device includes a filter tank, at least one filter assembly connected to the outlet pipe and disposed in the filter tank, multiple aeration devices placed in the filter tank, and a third filtration device connected to the second filtration device. The aeration device is used to aerobically treat the organic matter in the wastewater in the filtration tank via an outlet pipe. The filtration assembly includes multiple membrane modules disposed on the filtration assembly. Each membrane module includes a guide pipe connected to the outlet pipe, a membrane bioreactor located in the filtration tank, and a manifold connected to the filtration tank. One end of the manifold is connected to the filtration tank, and the other end is connected to the outlet pipe. The membrane bioreactor is used to filter and adsorb small microorganisms in the wastewater. The aeration device is used to aerobically treat the organic matter in the waste filtered by the second filtration device. The outlet pipe is connected to the manifold.

3. The household tofu workshop wastewater treatment and purification device as described in claim 1, characterized in that: The first filter device also includes four supports, and the filter assembly also includes a handle. The four supports are perpendicular to the horizontal ground and vertically arranged around the filter assembly to support the filter assembly. The handle is used to facilitate the removal and placement of the first filter and the second filter, and the handle is connected to a traction rope.

4. The household tofu workshop wastewater treatment and purification device as described in claim 3, characterized in that: The transport pipe includes a transport pipe body connected to the bottom side wall of the first filter device, and a plurality of anti-clogging components built into the transport pipe body. Each anti-clogging component includes a support pipe connected to the transport pipe body, two fixing parts disposed in the support pipe, and an anti-clogging valve disposed on the fixing parts. The anti-clogging valve includes an upper valve, a nozzle connected to the upper valve, a valve body connected to the nozzle, and a lower valve connected to the valve body.

5. The household tofu workshop wastewater treatment and purification device as described in claim 2, characterized in that: The filtration device further includes multiple first inclined tubes connected at one end to the first anaerobic reaction layer and at the other end to the second anaerobic reaction layer, a clarification zone located on the side of the second anaerobic reaction layer away from the ground, multiple second inclined tubes connected at one end to the second anaerobic reaction layer and at the other end to the clarification zone, and an outer tank. The inclination angle of the first inclined tubes is 75-90°, the inclination angle of the second inclined tubes is 45-60°, the aperture of the second inclined tubes is smaller than that of the first inclined tubes, and the length of the second inclined tubes is greater than that of the first inclined tubes. The clarification zone includes multiple guide vanes connected to the second inclined tubes and multiple three-phase separators connected to the guide vanes. The guide vanes are used to guide the wastewater passing through the second inclined tubes into the three-phase separators along the guide vanes. The three-phase separators are used to separate and filter the wastewater entering the three-phase separators. An observation hole is also provided outside the second anaerobic reaction layer for observing the sludge content in the second anaerobic reaction layer.

6. The household tofu workshop wastewater treatment and purification device as described in claim 5, characterized in that: The second filtration device further includes a circulation device, which includes an inner circulation pipe connected to the first anaerobic reaction layer and the second anaerobic reaction layer, a dilution circulation pipe connected to the three-phase separator, and an outer circulation pipe connected to the second anaerobic reaction layer. The inner circulation pipe is used to transport sludge from the second anaerobic reaction layer to the first anaerobic reaction layer. The dilution circulation pipe is used to transport wastewater that has been separated and filtered by the three-phase separator to the first filtration device to reduce the concentration of nutrients in the wastewater of the first filtration device while cleaning it. The outer circulation pipe is connected to the third filtration device and is used to transport sludge into the second anaerobic reaction layer.

7. The household tofu workshop wastewater treatment and purification device as described in claim 5, characterized in that: The emission device further includes a gas emission device connected to the three-phase separator, and an vent pipe. The gas emission device includes at least one exhaust pipe connected to the three-phase separator for discharging air, and multiple air filter layers connected to the exhaust pipe for deodorizing the putrid particles in the gas carried in the wastewater.

8. The household tofu workshop wastewater treatment and purification device as described in claim 2, characterized in that: The power delivery device further includes multiple air pumps and a control assembly connected to the water pump and the air pump. The air pumps are used to supply air to the third filtration device. The control assembly is used to control the operating status of the water pump and the air pump via circuit. The control assembly includes multiple flow rate adjustment knobs connected to the water pump and multiple air volume adjustment knobs connected to the air pump. Each flow rate adjustment knob is used to adjust the liquid flow rate delivered by the water pump corresponding to the flow rate adjustment knob, and each air volume adjustment knob is used to adjust the gas flow rate delivered by the air pump corresponding to the air volume adjustment knob.

9. The household tofu workshop wastewater treatment and purification device as described in claim 2, characterized in that: The third filtration device also includes a sludge inlet located in the filtration tank, and multiple drain pipes located at the bottom of the filtration tank for discharging waste from the filtration tank.

10. The household tofu workshop wastewater treatment and purification device as described in claim 8, characterized in that: The aeration device is connected to the air volume adjustment knob, and the oxygen delivery rate and amount to the aeration device are adjusted by the air volume adjustment knob.

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