A papermaking wastewater treatment device capable of cascade water resource recycling.

Abstract

This invention provides a papermaking wastewater treatment device capable of cascaded water resource recycling, relating to the field of wastewater treatment. It includes: a main body; a first filter tank, a second filter tank, a water quality and quantity adjustment tank, a hydrolysis reaction tank, and a deep purification tank fixedly installed on the front side of the main body; a membrane replacement mechanism installed inside the deep purification tank; the membrane replacement mechanism includes a rotating rod, a toothed drive belt, an adsorption membrane, and clamping rods. The toothed drive belt is sleeved on the outside of the rotating rod, and the clamping rods are engaged inside the toothed drive belt. The adsorption membrane is clamped between two opposing clamping rods. After starting the motor via the control terminal, the rotating rod rotates, and the adsorption membrane to be replaced is rotated to a horizontal position via the toothed drive belt. When the motor is stopped, the clamping rods are pulled out, allowing the adsorption membrane to be replaced. After replacement, the clamping rods are inserted back into the deep purification tank, completing the replacement. This solves the problem of inconvenient operation when replacing the adsorption membrane.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, and in particular to a papermaking wastewater treatment device that enables the cascade recycling and utilization of water resources. Background Technology

[0002] As a crucial basic raw material industry in my country, the papermaking industry generates a large amount of wastewater during its production process. Currently, common wastewater treatment methods for papermaking to achieve tiered water resource recycling mainly include the following: Traditional physicochemical treatment methods: These methods remove suspended solids and some colloidal substances from the wastewater through physical means such as sedimentation, filtration, and flotation; and reduce indicators such as chemical oxygen demand (COD) and biochemical oxygen demand (BOD) using chemical coagulation, neutralization, and oxidation-reduction. However, these methods are insufficient for deeply removing dissolved organic matter and trace pollutants, resulting in low water resource recycling rates. They typically only achieve preliminary purification, and the quality of reclaimed water cannot meet the high water quality requirements of papermaking processes. Furthermore, existing technologies have other shortcomings: replacing the adsorption membrane is inconvenient, leading to high energy consumption and significant resource waste; the equipment requires a large footprint, resulting in high investment and maintenance costs. Therefore, there is an urgent need to develop an innovative wastewater treatment device for papermaking to overcome the deficiencies of existing technologies and achieve efficient water resource recovery and recycling. Summary of the Invention

[0003] In view of this, the present invention provides a papermaking wastewater treatment device that enables the cascade recycling of water resources, thereby overcoming the shortcomings of inconvenient operation for replacing adsorption membranes, unsatisfactory water quality after wastewater purification and difficulty in achieving cascade recycling, high cost and relatively large footprint.

[0004] This invention provides a papermaking wastewater treatment device capable of cascaded water resource recycling, specifically comprising: a main body; a first filter tank, a second filter tank, a water quality and quantity regulating tank, a hydrolysis reaction tank, and a deep purification tank fixedly installed on the front side of the main body; an air pump installed on the rear side of the main body, and an oxygen pump installed on the right side of the main body; the second filter tank is snapped onto the rear side of the first filter tank; the water quality and quantity regulating tank is snapped onto the rear side of the second filter tank, an addition pipe is installed on the left side of the water quality and quantity regulating tank, and fixed slide rails are fixedly welded to the left and right sides of the inner wall of the water quality and quantity regulating tank; a sensing assembly consisting of a floating plate and a sensor is slidably snapped onto the fixed slide rails; the hydrolysis reaction tank is snapped onto the rear side of the water quality and quantity regulating tank, and a partition is fixedly installed in the middle of the interior of the hydrolysis reaction tank, the partition... The left side is an anaerobic hydrolysis acidification tank, and the right side of the partition is an aerobic composite biological reactor. The deep purification tank is installed in front of the hydrolysis reactor and to the right of the water quality and quantity adjustment tank. The deep purification tank is equipped with a membrane replacement mechanism. The membrane replacement mechanism includes a rotating rod, a toothed drive belt, an adsorption membrane, and a clamping rod. The toothed drive belt is sleeved on the outside of the rotating rod. The toothed drive belt on the left side is installed in the left panel of the deep purification tank. The clamping rod is clamped inside the toothed drive belt. The adsorption membrane is clamped between two opposing clamping rods. The end of the rotating rod on the upper rear side is coaxially connected to a motor, which is mounted on a motor support. Gears are fixedly connected to both ends of the rotating rod. The inner wall of the toothed drive belt has tooth grooves. The gears mesh with the toothed drive belt. A sealing sleeve is sleeved on the outer wall of the rotating rod. The sealing sleeve is clamped in the through hole of the device body through which the rotating rod passes and the deep purification tank.

[0005] Furthermore, a first locking post is fixedly connected to the front end of the second filter tank. The first locking post is engaged in a rectangular notch on the rear top surface of the first filter tank. The rear panel of the second filter tank is provided with filter holes with a filter aperture smaller than that of the effluent grid plate. The filter holes further remove smaller particles of impurities. A U-shaped structural plate is welded to the rear side of the filter holes and the rear end face of the second filter tank. The U-shaped structural plate at the rear end of the first filter tank has the same function as that of the U-shaped structural plate at the rear end of the first filter tank. Both are used to guide the wastewater to the water quality and quantity adjustment tank and increase the flowability of the wastewater. Two rectangular notches are opened on the rear top surface of the second filter tank. A locking plate is welded to the front end of the second filter tank. The locking plate is engaged in a slot on the outside of the back plate of the first filter tank. A slope plate is provided on the inner side of the front panel of the second filter tank.

[0006] Furthermore, a connecting plate is welded to the front end of the hydrolysis reaction tank, which is engaged in a slot on the rear end of the water quality and quantity adjustment tank. A sealing plate is fixedly connected to the top surface of the hydrolysis reaction tank. The sealing plate has irregularly shaped holes inside, with an incomplete circular hole at the top and a complete circular hole at the bottom. A sealing rotating plate is engaged inside the irregularly shaped holes, and a counterweight is set at the bottom rear side of the sealing rotating plate. The top surface of the sealing rotating plate is attached to the bottom surface of the incomplete circular hole at the top of the irregularly shaped holes. The tank is filled with a novel high-molecular anaerobic biological filler, providing a good attachment and growth environment for anaerobic microorganisms. Under anaerobic conditions, through the action of hydrolytic acidifying bacteria, the recalcitrant large-molecule organic matter in the wastewater is decomposed into easily biodegradable small-molecule organic matter, improving the biodegradability of the wastewater and removing some COD. Denitrifying bacteria utilize the oxygen in the anaerobic environment. Organic matter in the water acts as a carbon source, reducing nitrate nitrogen to nitrogen gas, thus achieving denitrification. When there is wastewater on the top surface of the sealing plate, the wastewater pressure causes the sealing plate to rotate downwards. After the wastewater flows below the sealing plate, the sealing plate automatically resets due to the influence of the counterweight. The top of the irregular hole is an incomplete circular hole structure, which restricts the rotation of the sealing plate, preventing it from rotating upwards. This ensures that its top surface fits against the bottom surface of the irregular hole, sealing the irregular hole and guaranteeing an oxygen-free environment inside the sealing plate. A third locking post is fixedly connected to the front end of the hydrolysis reaction tank. The third locking post is engaged in the rectangular notch on the top rear side of the water quality and quantity regulating tank. An air blower is installed at the bottom right side of the hydrolysis reaction tank. The outer surface of the air blower has ventilation holes, and an air pipe connected to an oxygen pump is installed inside the air blower. The air pipe of the oxygen pump passes through the main body of the device and the right side panel of the hydrolysis reaction tank.

[0007] Furthermore, the rear panel of the first filter tank is provided with an outlet grid plate, and the rear side of the outlet grid plate is provided with a U-shaped structural plate protruding from the rear end face of the first filter tank. The U-shaped structural plate can be used to guide the wastewater passing through the filter holes of the outlet grid plate into the second filter tank, preventing the wastewater from flowing down the rear panel of the first filter tank and causing leakage. At the same time, it can increase the flow of wastewater and improve the flow of wastewater inside the filter tank. Two rectangular notches are opened on the rear top surface of the first filter tank, and a slot is opened on the outer side of the back plate of the first filter tank.

[0008] Furthermore, the deep purification tank is equipped with nanofiltration membranes and reverse osmosis membranes. The nanofiltration membrane is installed behind the reverse osmosis membrane. The nanofiltration membrane is used to deeply purify the wastewater after biological treatment. It can remove divalent ions, small molecule organic matter and some hardness ions from the wastewater by retaining molecular weights between -Da. This further reduces the salt content and COD of the wastewater and improves the quality of the reclaimed water. Finally, the deep-purified wastewater is further treated by the reverse osmosis membrane to remove most of the salt, organic matter and microorganisms in the water, resulting in high-quality reclaimed water. The front end of the deep purification tank is fixedly connected to an outlet pipe, which runs through the front panel of the main body of the device.

[0009] Furthermore, the floating plate has a rectangular opening inside, with protruding T-shaped blocks on both the front and rear sides of the rectangular opening. The T-shaped blocks are engaged in the grooves on the outside of the fixed slide rail. A support plate with its top surface lower than the floating plate is provided on the outside of the floating plate and in the rectangular opening. A vertical through hole is provided inside the support plate. The sensor contains a liquid level sensing element, a wireless signal transceiver module, and a battery. An outer clamping plate is inserted inside the sensor. A protruding wedge-shaped block is provided at the bottom of the outer clamping plate. A clamping rod is connected to the top surface of the wedge-shaped block. An inner spring telescopic rod is connected between the clamping rod and the outer clamping plate. The distance that the inner spring telescopic rod can move is greater than the size of the wedge-shaped block protruding from the outer clamping plate. A movable clamping plate is fixedly connected to the top of the clamping rod. A transverse through hole is provided inside the movable clamping plate. A fixed plate is fixedly provided on the top surface of the sensor. A transverse slide groove is provided inside the fixed plate. The movable clamping plate is engaged in the transverse slide groove. Baffles are provided at both ends of the fixed plate. The movable clamping plate fits against the inner side of the baffle.

[0010] Furthermore, a second locking post is fixedly connected to the front end of the water quality and quantity regulating tank. This second locking post engages with a rectangular notch on the top rear surface of the second filtration tank, thus completing the fixed connection. Microfiltration holes are formed in the rear panel of the water quality and quantity regulating tank. A U-shaped structural plate is welded to the outer side of the outermost microfiltration holes and to the rear end face of the water quality and quantity regulating tank. This U-shaped structural plate serves the same function as the one at the rear end of the second filtration tank, guiding wastewater into the water quality and quantity regulating tank and increasing its flowability. The microfiltration holes have a pore size of - The mm filter screen traps tiny suspended solids and some colloidal substances, reducing the load on subsequent treatment units. The inner side of the front panel of the water quality and quantity equalization tank is equipped with a slope plate, which can be used to guide the dripping wastewater into the water quality and quantity equalization tank. Two rectangular notches are opened on the top rear side of the water quality and quantity equalization tank. A slot is opened on the rear rear side of the water quality and quantity equalization tank. The end of the addition pipe is connected to the output pipe of the coagulant addition pump. A micro motor is installed on the outside of the addition pipe via a bracket. The drive shaft of the micro motor is coaxially connected to a metering plate. A stirring plate is snapped into the inner bottom of the addition pipe.

[0011] Furthermore, a top plate is installed on the top surface of the main body of the device, which covers the top surface of the second filtration tank, the water quality and quantity adjustment tank, the hydrolysis reaction tank, and the deep purification tank. The gas pipe of the oxygen pump is sealed and installed in the right side panel of the main body of the device and the hydrolysis reaction tank, and the gas pipe is connected to the air blowing pipe at the bottom of the hydrolysis reaction tank. The left side of the hydrolysis reaction tank is the anaerobic hydrolysis acidification tank. The gas pipe of the air pump is sealed and installed in the rear side panel of the main body of the device and the hydrolysis reaction tank, and the gas pipe is connected to the interior of the anaerobic hydrolysis acidification tank. The top surface of the top plate is penetrated by an addition pipe. Beneficial effects

[0012] According to various embodiments of the present invention, after the motor is started by the external control terminal, it drives the rotating rod to rotate. When the adsorption membrane to be replaced is rotated to the upper horizontal position through the toothed transmission belt, the motor is stopped, the clamping rod is pulled out, and the adsorption membrane can be replaced. After the replacement is completed, the clamping rod is inserted back into the deep purification tank, and finally the right end of the clamping rod is inserted into the toothed transmission belt to complete the replacement.

[0013] In addition, through graded filtration, quantitative addition of additives, hydrolysis reaction tank and deep purification tank, pollutants such as organic matter, nitrogen and phosphorus, heavy metals and color in wastewater are deeply removed. The effluent quality meets or exceeds the national discharge standards, which greatly reduces environmental pollution and enables cascade recycling.

[0014] Furthermore, the sensors and control unit can automatically adjust the operating parameters of the equipment based on changes in water quality and quantity, reducing energy consumption and reagent usage. At the same time, the efficient recycling and utilization of water resources reduces the amount of fresh water required, and the concentrated water recycling and treatment unit realizes the recovery of useful substances, reducing the company's production costs and resulting in significant economic benefits.

[0015] In addition, the entire treatment device has a compact structure, a small footprint, and a high degree of integration between the various filtration tanks and reaction tanks. By using sensors in conjunction with an external control terminal, the treatment process is automated and remotely monitored, reducing manual operation and management costs, improving the operational stability and reliability of the equipment, and facilitating large-scale promotion and application. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings of the embodiments will be briefly described below.

[0017] The accompanying drawings described below are only related to some embodiments of the invention and are not intended to limit the invention.

[0018] In the attached diagram:

[0019] Figure 1 This is a structural schematic diagram of the device as a whole from the right front side view according to an embodiment of the present invention.

[0020] Figure 2 This is a schematic diagram of the internal structure of the device body according to an embodiment of the present invention.

[0021] Figure 3 This is a schematic diagram showing the unfolded structure between the first filtration pool, the second filtration pool, and the deep purification pool in an embodiment of the present invention.

[0022] Figure 4 This is a cross-sectional structural diagram of the water quality and quantity regulating tank according to an embodiment of the present invention.

[0023] Figure 5 This is an embodiment of the present invention. Figure 4 A magnified structural diagram of point A in the middle.

[0024] Figure 6 This is a schematic diagram of the unfolded structure of the sensing component according to an embodiment of the present invention.

[0025] Figure 7 This is an embodiment of the present invention. Figure 6 A magnified structural diagram at point B in the middle.

[0026] Figure 8 This is a schematic diagram of the structure of the hydrolysis reaction tank according to an embodiment of the present invention.

[0027] Figure 9 This is a schematic diagram of the membrane changing mechanism according to an embodiment of the present invention.

[0028] List of reference numerals

[0029] 1. Main body of the device; 101. Top plate; 102. Motor support base; 2. First filter tank; 201. Outlet grating plate; 3. Second filter tank; 301. First clamping column; 4. Water quality and quantity adjustment tank; 401. Second clamping column; 402. Fixed slide rail; 403. Addition pipe; 4031. Micro motor; 4032. Metering plate; 4033. Stirring plate; 5. Hydrolysis reaction tank; 501. Connecting plate; 502. Sealing rotating plate; 5021. Counterweight 503, Third clamping post; 504, Partition plate; 505, Air blowing pipe; 6, Deep purification tank; 601, Nanofiltration membrane; 602, Reverse osmosis membrane; 7, Sensing component; 71, Floating plate; 72, Sensor; 7201, Fixed plate; 7202, Moving clamping plate; 72021, Clamping rod; 72022, Inner spring telescopic rod; 7203, Outer clamping plate; 8, Membrane changing mechanism; 81, Rotating rod; 82, Toothed drive belt; 83, Adsorption membrane; 84, Clamping rod. Detailed Implementation

[0030] To make the objectives, solutions, and advantages of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Unless otherwise stated, the terms used herein have their ordinary meanings in the art. The same reference numerals in the drawings represent the same parts.

[0031] Example: Please refer to Figures 1 to 9 As shown:

[0032] This invention provides a papermaking wastewater treatment device capable of cascaded water resource recycling, comprising a main body 1; a first filter tank 2, a second filter tank 3, a water quality and quantity regulating tank 4, a hydrolysis reaction tank 5, and a deep purification tank 6 are fixedly installed on the front side of the main body 1; an air pump is installed on the rear side of the main body 1, and an oxygen pump is installed on the right side of the main body 1; the second filter tank 3 is snapped onto the rear side of the first filter tank 2; the water quality and quantity regulating tank 4 is snapped onto the rear side of the second filter tank 3, and an addition pipe 403 is installed on the left side of the water quality and quantity regulating tank 4; fixed slide rails 402 are fixedly welded to the left and right sides of the inner wall of the water quality and quantity regulating tank 4; a sensing assembly 7 composed of a float plate 71 and a sensor 72 is slidably snapped onto the fixed slide rails 402; the hydrolysis reaction tank 5 is snapped onto the water quality and quantity regulating tank 6. Behind the equalization tank 4, a partition 504 is fixedly installed in the middle of the interior of the hydrolysis reaction tank 5. The left side of the partition 504 is an anaerobic hydrolysis acidification tank, and the right side of the partition 504 is an aerobic composite biological reaction tank. The deep purification tank 6 is installed in front of the hydrolysis reaction tank 5 and to the right of the water quality and quantity equalization tank 4. The membrane replacement mechanism 8 is installed inside the deep purification tank 6. The membrane replacement mechanism 8 includes a rotating rod 81, a toothed drive belt 82, an adsorption membrane 83, and a clamping rod 84. The toothed drive belt 82 is sleeved on the outside of the rotating rod 81. The left toothed drive belt 82 is installed in the left panel of the deep purification tank 6. The clamping rod 84 is clamped inside the toothed drive belt 82. The adsorption membrane 83 is clamped between the two opposing clamping rods 84. The end of the rotating rod 81 on the upper rear side is coaxially connected to a motor, which is installed on the motor support 102.

[0033] The rotating rod 81 has gears fixedly connected to both ends. The inner wall of the gear transmission belt 82 has toothed grooves, and the gears mesh with the gear transmission belt 82. A sealing sleeve is fitted into the outer wall of the rotating rod 81, and the sealing sleeve is engaged in the through hole through which the rotating rod 81 passes between the main body 1 and the deep purification tank 6. The clamping rod 84 has a slot inside, and the adsorption membrane 83 is clamped in the slot. After the motor is started via an external control terminal, the rotating rod 81 is driven to rotate coaxially through the drive shaft. The gear meshing drives the gear transmission belt 82 to rotate, and the other three rotating rods 81 support the gear transmission belt 82. At this time, the clamping rod 84, which needs to hold the adsorption membrane 83, rotates synchronously with the gear transmission belt 82. (The last sentence appears to be incomplete and possibly refers to a different part of the design.) When the adsorption membrane 83 rotates to the horizontal position, stop the motor and pull out the clamping rod 84 to replace the adsorption membrane 83. After replacement, insert the clamping rod 84 back into the deep purification tank 6. Finally, insert the right end of the clamping rod 84 into the toothed drive belt 82 to complete the replacement. The adsorption membrane 83 is made of activated carbon and nanofiber composite adsorption material. Activated carbon has a rich pore structure and can adsorb pollutants such as organic matter and heavy metals in wastewater. Nanofiber has a large specific surface area and good adsorption performance, which can intercept small particles and some dissolved organic matter. When wastewater passes through the adsorption device, pollutants are adsorbed and removed by the adsorption material, further purifying the water quality.

[0034] The second filter tank 3 has a first locking post 301 fixedly connected to its front end. The first locking post 301 is engaged in a rectangular notch on the top rear side of the first filter tank 2. The rear panel of the second filter tank 3 has filter holes with a diameter smaller than that of the effluent grid plate 201. The filter holes further remove smaller particles of impurities. A U-shaped structural plate is welded to the rear side of the filter holes and the rear end face of the second filter tank 3. The U-shaped structural plate at the rear end of the first filter tank 2 serves the same purpose as the U-shaped structural plate at the rear end of the first filter tank 2, which is to guide the wastewater to the water quality and quantity adjustment tank 4 and increase the flowability of the wastewater. Two rectangular notches are opened on the top rear side of the second filter tank 3. A locking plate is welded to the front end face of the second filter tank 3. The locking plate is engaged in a slot on the outside of the back plate of the first filter tank 2. A slope plate is provided on the inner side of the front panel of the second filter tank 3. The slope plate can guide the dripping wastewater into the second filter tank 3, thereby preventing it from flowing out.

[0035] The device body 1 has a top plate 101 installed on its top surface, which covers the top surfaces of the second filtration tank 3, the water quality and quantity adjustment tank 4, the hydrolysis reaction tank 5, and the deep purification tank 6. The gas pipe of the oxygen pump is sealed in the right side panel of the device body 1 and the hydrolysis reaction tank 5, and the gas pipe is connected to the air blowing pipe 505 at the bottom of the hydrolysis reaction tank 5. The left side of the hydrolysis reaction tank 5 is the anaerobic hydrolysis acidification tank. The gas pipe of the air pump is sealed in the rear side panel of the device body 1 and the hydrolysis reaction tank 5, and the gas pipe is connected to the interior of the anaerobic hydrolysis acidification tank. The top surface of the top plate 101 is penetrated by the addition pipe 403. The top plate 101 is used to seal the various tanks inside the device body 1 to avoid secondary pollution to the environment, and at the same time, it can maintain the relative stability of the environment inside the tanks and ensure the effectiveness of wastewater treatment index monitoring.

[0036] The hydrolysis reaction tank 5 has a connecting plate 501 welded to its front end. The connecting plate 501 is snapped into a slot on the rear end of the water quality and quantity regulating tank 4. A sealing plate is fixedly connected to the top surface of the hydrolysis reaction tank 5. The sealing plate has irregularly shaped holes inside. The top of the irregularly shaped holes is an incomplete circular hole structure, and the bottom is a complete circular hole structure. A sealing rotating plate 502 is snapped into the irregularly shaped holes. A counterweight block 5021 is set at the bottom rear side of the sealing rotating plate 502, and the top surface of the sealing rotating plate 502 is attached to the bottom surface of the incomplete circular hole at the top of the irregularly shaped holes. The tank is filled with a new type of high-polymer anaerobic biological packing material. This provides a favorable environment for the attachment and growth of anaerobic microorganisms. When there is wastewater on the top surface of the sealing rotating plate 502, the wastewater pressure causes the sealing rotating plate 502 to rotate downwards. After the wastewater flows to the bottom of the sealing plate, the sealing rotating plate 502 automatically resets under the influence of the counterweight 5021. The top of the irregular hole is an incomplete circular hole structure, which restricts the rotation of the sealing rotating plate 502, preventing it from rotating upwards. This ensures that its top surface adheres to the bottom surface of the irregular hole, sealing the irregular hole and guaranteeing an anaerobic environment inside the sealing plate. Under anaerobic conditions, through the action of hydrolytic acidifying bacteria, the difficult-to-clean wastewater is dissolved. The degradation process breaks down large organic molecules into easily biodegradable small organic molecules, improving the biodegradability of wastewater and removing some COD. Denitrifying bacteria, operating in an anaerobic environment, utilize the organic matter in the influent as a carbon source to reduce nitrate nitrogen to nitrogen gas, achieving denitrification. A third retaining post 503 is fixedly connected to the front end of the hydrolysis reaction tank 5, engaging with a rectangular notch on the rear top surface of the water quality and quantity equalization tank 4. An air venting pipe 505 is installed at the bottom right side of the hydrolysis reaction tank 5. The outer surface of the air venting pipe 505 has ventilation holes, and a connecting... The oxygen pump's air pipe runs through the right side panel of the main body 1 and the hydrolysis reaction tank 5. After the oxygen pump is started via the external control terminal, oxygen is pumped into the aeration pipe 505 through the air pipe. The oxygen is then evenly delivered to the aerobic composite biological reaction tank on the right side of the hydrolysis reaction tank 5 through the vent holes on the aeration pipe 505. At the same time, the vent holes can be used to continuously agitate the wastewater in the reaction tank to ensure fluidity and increase the oxygen content. By adopting a microporous aeration method, microorganisms further decompose organic matter under aerobic conditions and carry out nitrification reaction, converting ammonia nitrogen into nitrate nitrogen.

[0037] The deep purification tank 6 is equipped with a nanofiltration membrane 601 and a reverse osmosis membrane 602. The nanofiltration membrane 601 is installed behind the reverse osmosis membrane 602. The nanofiltration membrane 601 is used to deeply purify the wastewater after biological treatment. It can remove molecular weights between 100-1000 Da and effectively remove divalent ions, small organic molecules and some hardness ions from the wastewater. This further reduces the salt content and COD of the wastewater and improves the quality of the reused water. Finally, the deep-purified wastewater is further treated by the reverse osmosis membrane 602 to remove most of the salt, organic matter and microorganisms in the water, resulting in high-quality reused water. The front end of the deep purification tank 6 is fixedly connected to an outlet pipe. The outlet pipe runs through the front panel of the main body 1. The deep-purified wastewater is discharged through the outlet pipe and finally flows into the reuse distribution system.

[0038] The first filter tank 2 has an outlet grid plate 201 on its rear panel. The outlet grid plate 201 has a U-shaped structure plate protruding from the rear end face of the first filter tank 2. The U-shaped structure plate can guide the wastewater passing through the filter holes of the outlet grid plate 201 into the second filter tank 3, preventing the wastewater from flowing down the rear panel of the first filter tank 2 and causing leakage. At the same time, it can increase the flow of wastewater and improve the flow of wastewater inside the filter tank. The rear top surface of the first filter tank 2 has two rectangular notches. The back plate of the first filter tank 2 has a slot. The outlet grid plate 201 is used to intercept larger floating and suspended objects in the wastewater, such as bark and fiber bundles.

[0039] The floating plate 71 has a rectangular opening inside, with protruding T-shaped blocks on both sides of the rectangular opening. These T-shaped blocks engage with grooves on the outer side of the fixed slide rail 402. A support plate, with its top surface lower than the floating plate 71, is located on the outer side of the floating plate 71 within the rectangular opening. A vertically penetrating through hole is located inside the support plate. The sensor 72 houses a liquid level sensing element, a wireless signal transceiver module, and a battery. An outer clamping plate 7203 is inserted into the sensor 72. A protruding wedge-shaped block is located at the bottom of the outer clamping plate 7203. A clamping rod 72021 is connected to the top of the wedge-shaped block. An inner spring telescopic rod 72022 connects the clamping rod 72021 and the outer clamping plate 7203. The movable distance of the inner spring telescopic rod 72022 is greater than the protrusion of the wedge-shaped block from the outer clamping plate 7203. A movable clamping plate 7202 is fixedly connected to the top of the clamping rod 72021. A transverse through hole is located inside the movable clamping plate 7202. A fixing plate 7201 is fixedly installed on the top surface of the 2. A transverse sliding groove is opened inside the fixing plate 7201. The movable clamping plate 7202 is engaged in the transverse sliding groove. Baffles are set at both ends of the fixing plate 7201. The movable clamping plate 7202 fits against the inner side of the baffle. After pressing the sensor 72 down, the outer clamping plate 7203 passes through the through hole inside the floating plate 71. The clamping rod 72021 is kept in the outermost position by the inner spring telescopic rod 72022. The wedge block at the bottom of the outer clamping plate 7203 is pushed to keep it in the outermost position, thus completing the fixed engagement between the sensor 72 and the floating plate 71. After wastewater flows into the water quality and quantity regulating tank 4, the floating plate 71 is floated by buoyancy. The support plate drives the sensor 72 to float up synchronously. The liquid level sensing element measures the height of the wastewater and monitors the flow rate and other indicators of the wastewater online. The inlet valve is automatically adjusted according to the monitoring data to regulate the flow rate and keep the water quality and quantity of the wastewater relatively stable.

[0040] The water quality and quantity regulating tank 4 is fixedly connected to a second locking post 401 at its front end. The second locking post 401 engages with a rectangular notch on the rear top surface of the second filter tank 3, thus completing the fixed connection between the two. Microfiltration holes are provided in the rear panel of the water quality and quantity regulating tank 4. A U-shaped structural plate is welded to the outermost microfiltration holes and the rear end face of the water quality and quantity regulating tank 4. This U-shaped structural plate serves the same function as the one at the rear end of the second filter tank 3, which is to guide wastewater to… In the water quality and quantity equalization tank 4, the flowability of wastewater is increased. The microfiltration pores use a filter screen with a pore size of 0.1-1mm to intercept small suspended solids and some colloidal substances, reducing the load on subsequent treatment units. A slope is provided on the inner side of the front panel of the water quality and quantity equalization tank 4, which guides dripping wastewater into the tank. Two rectangular notches are provided on the top rear side of the water quality and quantity equalization tank 4, and a slot is provided on the rear rear face for adding pipes. The end of the addition pipe 403 is connected to the output pipe of the coagulant addition pump. A micro motor 4031 is mounted on the outside of the addition pipe 403 via a bracket. The drive shaft of the micro motor 4031 is coaxially connected to a metering plate 4032. A stirring plate 4033 is snapped into the inner bottom of the addition pipe 403. After the micro motor 4031 is started by the external control terminal, the metering plate 4032 is rotated through the drive shaft, so that the additive can be added quantitatively and at a uniform speed. The additives are coagulants and coagulants such as polyaluminum chloride (PAC) and polyacrylamide (PAM) according to the wastewater quality. After the additives are quantitatively added to the bottom of the addition pipe 403, they hit the top surface of the stirring plate 4033, stirring the stirring plate 4033 to rotate, thereby increasing the fluidity of the wastewater and the additive contact point, achieving uniform mixing. After the wastewater is fully mixed and reacted in the tank, it forms larger flocs, achieving solid-liquid separation and effectively removing colloids, some organic matter and suspended solids in the wastewater, creating good conditions for subsequent treatment.

[0041] The specific embodiments of the present invention are as follows:

[0042] Papermaking wastewater first enters the first filtration tank 2, and then passes through the filter holes of the effluent grid plate 201, the filter holes in the rear panel of the second filtration tank 3, and the micro-filtration holes in the rear panel of the water quality and quantity regulating tank 4 to remove larger floating and suspended solids. As the wastewater flows into the water quality and quantity regulating tank 4, the height of the wastewater is measured by a liquid level sensor element, and the flow rate and other indicators of the wastewater are monitored online. After the micro motor 4031 is started by the external control terminal, the quantitative dispensing plate 4032 is driven by the drive shaft to rotate, so that the additive can be added quantitatively and at a uniform speed. After the additive is quantitatively added to the bottom of the addition pipe 403, it hits the top surface of the stirring plate 4033 and stirs the stirring plate 4033 to rotate. The wastewater is fully mixed and reacted in the tank to form larger flocs, thus achieving solid-liquid separation.

[0043] Afterwards, the wastewater enters the anaerobic hydrolysis acidification tank, where large organic molecules are decomposed into small organic molecules by anaerobic microorganisms. Denitrification and nitrogen removal occur in the anoxic zone, and then the wastewater flows into the aerobic composite biological reactor, where organic matter decomposition and nitrification reactions occur in the aerobic zone. Finally, the wastewater enters the deep purification tank 6, where the remaining pollutants are removed by the adsorption membrane 83.

[0044] Finally, the wastewater after biological treatment is further purified by using nanofiltration membrane 601 to remove divalent ions, small molecule organic matter and some hardness ions, further reducing the salt content and COD of the wastewater and improving the water quality of the reused water. Finally, the wastewater after deep purification is further treated by reverse osmosis membrane 602 to remove most of the salt, organic matter and microorganisms in the water, resulting in high-quality reuse.

Claims

1. A papermaking wastewater treatment device capable of realizing cascaded water resource recycling, comprising: The device body (1) is characterized in that a first filter tank (2), a second filter tank (3), a water quality and quantity adjustment tank (4), a hydrolysis reaction tank (5), and a deep purification tank (6) are fixedly installed on the front side inside the device body (1). An air pump is installed on the rear side outside the device body (1). An oxygen pump is installed on the right side of the device body (1). The air pipe of the oxygen pump is sealed and installed in the right side panel of the device body (1) and the hydrolysis reaction tank (5), and the air pipe is connected to the air blower (505) at the bottom of the hydrolysis reaction tank (5). The left side of the hydrolysis reaction tank (5) is an anaerobic hydrolysis acidification tank. The air pipe of the air pump is sealed and installed in the right side panel of the device body (1) and the hydrolysis reaction tank (5). The second filter tank (3) is connected to the rear side of the first filter tank (2); the water quality and quantity regulating tank (4) is connected to the rear side of the second filter tank (3), and an addition pipe (403) is installed on the left side of the water quality and quantity regulating tank (4), and fixed slide rails (402) are fixedly welded to the left and right sides of the inner wall of the water quality and quantity regulating tank (4); a sensing component (7) consisting of a floating plate (71) and a sensor (72) is slidably connected to the fixed slide rail (402); the hydrolysis reaction tank (5) is connected to the rear side of the water quality and quantity regulating tank (4), and the hydrolysis reaction tank (5) is connected to the rear side of the water quality and quantity regulating tank (4), and the water quality and quantity regulating tank (4) is connected to the rear side of the first filter tank (2); the water quality and quantity regulating tank (4) is connected to the rear side of the first filter tank (2); the water quality and quantity regulating tank (4) is connected to the rear side of the first filter tank (2); the water quality and quantity regulating tank (4) is connected to the rear side of the second filter tank (3), and ... first filter tank (2), and the water quality and quantity regulating tank (4) is connected to the rear side of the second filter tank (3), and the water quality and quantity regulating tank (4) is connected to the rear side of the first filter tank (2); the water quality and quantity regulating tank (4) is connected to the rear side of the second filter tank (3), and the water quality and quantity regulating tank (4) is connected to the rear side of the first filter tank (2), and the water quality and quantity regulating tank (4) is connected to the rear side of the first A partition (504) is fixedly installed in the middle of the interior of the deep purification tank (6). The left side of the partition (504) is an anaerobic hydrolysis acidification tank, and the right side of the partition (504) is an aerobic composite biological reaction tank. The deep purification tank (6) is installed in front of the hydrolysis reaction tank (5) and to the right of the water quality and quantity adjustment tank (4). A membrane replacement mechanism (8) is installed inside the deep purification tank (6). The membrane replacement mechanism (8) includes a rotating rod (81), a toothed drive belt (82), an adsorption membrane (83), and a clamping rod (84). The toothed drive belt (82) is sleeved on the outside of the rotating rod (81). The left toothed drive belt (82) is installed in the left panel of the deep purification tank (6). The internal clamping rod (84) of the 82) clamps the adsorption membrane (83) between the two opposing clamping rods (84). The end of the rotating rod (81) on the upper rear side is coaxially connected to a motor. The motor is mounted on the motor support base (102). Gears are fixedly connected to both ends of the rotating rod (81). The inner wall of the gear transmission belt (82) is provided with tooth grooves. The gears mesh with the tooth grooves on the gear transmission belt (82). The outer wall of the rotating rod (81) is grooved and fitted with a sealing sleeve. The sealing sleeve is clamped in the through hole of the device body (1) and the deep purification pool (6) through which the rotating rod (81) passes. The inside of the clamping rod (84) is provided with a slot, and the adsorption membrane (83) is clamped in the slot.The floating plate (71) has a rectangular opening inside, and protruding T-shaped blocks are provided on the front and rear sides of the rectangular opening. The T-shaped blocks are engaged in the sliding grooves on the outside of the fixed slide rail (402). A support plate with its top surface lower than the floating plate (71) is provided on the outside of the floating plate (71) and in the rectangular opening. A vertical through hole is provided inside the support plate. The sensor (72) contains a liquid level sensing element, a wireless signal transceiver module and a battery. An outer clamping plate (7203) is inserted into the sensor (72). A protruding wedge-shaped block is provided at the bottom of the outer clamping plate (7203). A clamping rod (72021) is connected to the top surface of the wedge-shaped block. The clamping rod (72021) is connected to the outer clamping plate (72021). An inner spring telescopic rod (72022) is connected between the clamping plates (7203). The movable distance of the inner spring telescopic rod (72022) is greater than the size of the wedge block protruding from the outer clamping plate (7203). A movable clamping plate (7202) is fixedly connected to the top of the clamping rod (72021). A transverse through hole is opened inside the movable clamping plate (7202). A fixing plate (7201) is fixedly installed on the top surface of the sensor (72). A transverse sliding groove is opened inside the fixing plate (7201). The movable clamping plate (7202) is engaged in the transverse sliding groove. Baffles are provided at both ends of the fixing plate (7201). The movable clamping plate (7202) fits against the inner side of the baffle.

2. The papermaking wastewater treatment device for cascaded water resource recycling as described in claim 1, characterized in that: The top surface of the main body (1) of the device is equipped with a top plate (101), which covers the top surface of the second filter pool (3), the water quality and quantity adjustment pool (4), the hydrolysis reaction pool (5) and the deep purification pool (6), and the top surface of the top plate (101) is penetrated by the addition pipe (403).

3. The papermaking wastewater treatment device for cascaded water resource recycling as described in claim 1, characterized in that: The rear panel of the first filter tank (2) is provided with an outlet grid plate (201). The rear side of the outlet grid plate (201) is provided with a U-shaped structural plate protruding from the rear end face of the first filter tank (2). Two rectangular notches are opened on the rear top surface of the first filter tank (2). A slot is opened on the outer side of the back plate of the first filter tank (2).

4. The papermaking wastewater treatment device for cascaded water resource recycling as described in claim 3, characterized in that: The front end face of the second filter pool (3) is fixedly connected to a first locking post (301), which is engaged in a rectangular notch on the rear top surface of the first filter pool (2). The rear panel of the second filter pool (3) is provided with filter holes with a filter aperture smaller than that of the effluent grid plate (201). A U-shaped structural plate is welded to the rear side of the filter holes and the rear end face of the second filter pool (3). Two rectangular notches are opened on the rear top surface of the second filter pool (3). A locking plate is welded to the front end face of the second filter pool (3). The locking plate is engaged in a slot on the outside of the back plate of the first filter pool (2). A slope plate is provided on the inner side of the front panel of the second filter pool (3).

5. The papermaking wastewater treatment device for cascaded water resource recycling as described in claim 4, characterized in that: The front end of the water quality and quantity regulating tank (4) is fixedly connected to a second locking post (401). The second locking post (401) is locked in a rectangular notch on the rear top surface of the second filter tank (3). A micro-filtration hole is opened in the rear panel of the water quality and quantity regulating tank (4). A U-shaped structural plate is welded to the outer side of the outermost micro-filtration hole and the rear end face of the water quality and quantity regulating tank (4). A slope plate is provided on the inner side of the front panel of the water quality and quantity regulating tank (4). Two rectangular notches are opened on the rear top surface of the water quality and quantity regulating tank (4). A slot is opened on the rear end face of the water quality and quantity regulating tank (4). The end of the adding pipe (403) is connected to the output pipe of the coagulant adding pump. A micro motor (4031) is installed on the outer side of the adding pipe (403) through a bracket. A quantitative dispensing plate (4032) is coaxially connected to the drive shaft of the micro motor (4031). A stirring plate (4033) is locked on the inner side of the bottom of the adding pipe (403).

6. The papermaking wastewater treatment device for cascaded water resource recycling as described in claim 5, characterized in that: The front end of the hydrolysis reaction tank (5) is welded with a connecting plate (501), which is snapped into the slot on the rear end of the water quality and quantity regulating tank (4). A sealing plate is fixedly connected to the top surface of the hydrolysis reaction tank (5). The sealing plate has an irregular hole inside, with an incomplete circular hole at the top and a complete circular hole at the bottom. A sealing rotating plate (502) is snapped into the inside of the irregular hole. A counterweight (5021) is provided at the bottom rear side of the sealing rotating plate (502). The top surface of the sealing rotating plate (502) is also provided with a counterweight (5021). The bottom surface of the incomplete circular hole at the top of the irregular hole is attached to the front end of the hydrolysis reaction tank (5). The third locking post (503) is fixedly connected to the front end of the hydrolysis reaction tank (5). The third locking post (503) is locked in the rectangular notch on the top side of the water quality and quantity regulating tank (4). An air blowing pipe (505) is installed at the bottom right side of the hydrolysis reaction tank (5). The outer surface of the air blowing pipe (505) is provided with a vent hole. An air pipe connected to the oxygen pump is installed inside the air blowing pipe (505). The air pipe of the oxygen pump passes through the main body of the device (1) and the right side panel of the hydrolysis reaction tank (5).

7. The papermaking wastewater treatment device for cascaded water resource recycling as described in claim 6, characterized in that: The deep purification tank (6) is equipped with a nanofiltration membrane (601) and a reverse osmosis membrane (602). The nanofiltration membrane (601) is installed on the rear side of the reverse osmosis membrane (602). The front end of the deep purification tank (6) is fixedly connected to an outlet pipe, which passes through the front panel of the main body (1) of the device.

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