Papermaking wastewater treatment device capable of realizing gradient recycling of water resources

Abstract

The invention provides a papermaking wastewater treatment device capable of realizing gradient recycling of water resources, and relates to the field of wastewater treatment. A first filter tank, a second filter tank, a water quality and quantity adjusting tank, a hydrolysis reaction tank and a deep purification tank are fixedly mounted on the front side in the device main body; a membrane changing mechanism is mounted in the deep purification tank; the film changing mechanism comprises a rotating rod, a toothed transmission belt, an adsorption film and clamping rods, the rotating rod is sleeved with the toothed transmission belt, the clamping rods are clamped in the toothed transmission belt, the adsorption film is clamped between the two opposite clamping rods, and the rotating rod is driven to rotate after a motor is started through the control end; when the adsorption film needing to be replaced is rotated to the upper portion to be in the horizontal state through the tooth transmission belt, the motor is stopped, the clamping rod is pulled out, the adsorption film can be replaced, the clamping rod is inserted back into the deep purification pond after replacement is completed, replacement is completed, and the problem that the adsorption film is inconvenient to replace is solved.

Description

Technical Field

[0001] The invention relates to the technical field of wastewater treatment, and in particular to a papermaking wastewater treatment device capable of realizing cascade recycling of water resources. Background Art

[0002] The papermaking industry generates a large amount of wastewater during the production process. At present, the common papermaking wastewater treatment methods for realizing the cascade recycling of water resources mainly include the following: traditional physical and chemical treatment methods: through physical methods such as precipitation, filtration, flotation, etc., to remove suspended matter and some colloidal substances in the wastewater; chemical coagulation, neutralization, oxidation-reduction and other means are used to reduce the chemical oxygen demand (COD), biochemical oxygen demand (BOD) and other indicators of the wastewater. However, this method is difficult to deeply remove dissolved organic matter and trace pollutants, and the water resource recycling rate is low. It can usually only achieve preliminary purification, and the quality of the recycled water cannot meet the high water quality requirements in papermaking production. In addition, the existing technology also has many other deficiencies: the adsorption membrane is inconvenient to operate when it needs to be replaced, resulting in high energy consumption and serious waste of resources in the treatment process; the equipment occupies a large area, and the investment cost and operation and maintenance cost are high. Therefore, it is urgent to develop an innovative papermaking wastewater treatment device to overcome the defects of the existing technology and realize the efficient recycling and recycling of water resources. Summary of the invention

[0003] In view of this, the present invention provides a papermaking wastewater treatment device which can realize the cascade recycling of water resources, so as to overcome the defects of inconvenient operation of adsorption membrane replacement, unsatisfactory water quality after wastewater purification treatment and difficulty in cascade recycling, high cost and relatively large footprint.

[0004] The present invention provides a papermaking wastewater treatment device capable of realizing cascade recycling of water resources, specifically including: a device main body; a first filtration tank, a second filtration tank, a water quality and quantity regulation tank, a hydrolysis reaction tank, and a deep purification tank are fixedly installed on the front side inside the device main body, an air extraction pump is installed on the rear side outside the device main body, and an oxygen pump is installed on the right side of the device main body; the second filtration tank is clamped at the rear of the first filtration tank; the water quality and quantity regulation tank is clamped at the rear of the second filtration tank, an adding pipe is installed on the left side of the water quality and quantity regulation tank, and fixed slide rails are respectively fixedly welded on the left and right sides of the inner wall of the water quality and quantity regulation tank; a sensing assembly composed of a floating plate and a sensor is slidably clamped on the fixed slide rails; the hydrolysis reaction tank is clamped at the rear of the water quality and quantity regulation tank, a partition is fixedly established in the middle of the hydrolysis reaction tank, the left side of the partition is an anaerobic hydrolysis acidification tank, and the right side of the partition is an aerobic composite biological reaction tank; the deep purification tank is installed in front of the hydrolysis reaction tank and on the right side of the water quality and quantity regulation tank, and a membrane replacement mechanism is installed inside the deep purification tank; the membrane replacement mechanism includes a rotating rod, a toothed transmission belt, an adsorption membrane, and a clamping rod. The toothed transmission belt is sleeved outside the rotating rod, the left toothed transmission belt is installed in the left panel of the deep purification tank, the clamping rod is clamped inside the toothed transmission belt, the adsorption membrane is clamped between two facing clamping rods, the end of the rotating rod at the upper rear side is coaxially connected to a motor, the motor is installed on a motor support seat, gears are respectively fixedly connected to both ends of the rotating rod, tooth grooves are formed on the inner wall of the toothed transmission belt, and the gears are meshed with the toothed transmission belt. A sealing sleeve is sleeved in a groove on the outer wall of the rotating rod, and the sealing sleeve is clamped in the through holes of the device main body and the deep purification tank penetrated by the rotating rod.

[0005] Further, a first clamping column is fixedly connected to the front end face of the second filtration tank, the first clamping column is clamped in a rectangular notch on the rear top surface of the first filtration tank, the rear panel of the second filtration tank is provided with filter holes with a filtration aperture smaller than that of the outlet grille plate to further remove smaller particle impurities, and a U-shaped structural plate is welded on the rear side of the filter holes and the rear end face of the second filtration tank, which has the same function as the U-shaped structural plate at the rear end of the first filtration tank, both of which are to divert the wastewater into the water quality and quantity regulation tank and can increase the fluidity of the wastewater at the same time. Two rectangular notches are opened on the rear top surface of the second filtration tank, a clamping plate is welded on the front end face of the second filtration tank, the clamping plate is clamped in a clamping groove on the outer side of the back plate of the first filtration tank, and a slope plate is arranged on the inner side of the front panel of the second filtration tank.

[0006] Furthermore, a connecting clamping plate is welded to the front end face of the hydrolysis reaction tank. The connecting clamping plate is clamped in the clamping groove on the rear end face of the water quality and quantity regulation tank. A sealing plate is fixedly connected to the top surface of the hydrolysis reaction tank. An irregular hole is formed inside the sealing plate. The top of the irregular hole is an incomplete circular hole structure, and the bottom is a complete circular hole structure. A sealing rotating plate is clamped inside the irregular hole. A counterweight is arranged at the bottom of the rear side of the sealing rotating plate, and the top surface of the sealing rotating plate is attached to the bottom surface of the incomplete circular hole at the top of the irregular hole. The inside of the tank is filled with a new type of polymer anaerobic biological filler, providing a good attachment growth environment for anaerobic microorganisms. Under anaerobic conditions, through the action of hydrolytic acidifying bacteria, the macromolecular organic matter that is difficult to degrade in the wastewater is decomposed into small molecular organic matter that is easily biodegradable, improving the biodegradability of the wastewater and removing part of the COD at the same time. Denitrifying bacteria use the organic matter in the influent as a carbon source in an anoxic environment to reduce nitrate nitrogen to nitrogen, achieving nitrogen removal. When there is wastewater on the top surface of the sealing rotating plate, the wastewater presses the sealing rotating plate to rotate downward. After the wastewater flows to the lower part of the sealing plate, the sealing rotating plate automatically resets under the influence of the counterweight. The top of the irregular hole is an incomplete circular hole structure, which restricts the rotation of the sealing rotating plate. The sealing rotating plate cannot rotate upward, ensuring that its top surface fits to the bottom surface of the irregular hole to seal the irregular hole and ensure an anaerobic environment inside the sealing plate. A third clamping post is fixedly connected to the front end face of the hydrolysis reaction tank. The third clamping post is clamped in the rectangular notch on the rear top surface of the water quality and quantity regulation tank. An air injection pipe is installed at the bottom on the right side of the hydrolysis reaction tank. Air holes are formed on the outer surface of the air injection pipe. An air pipe connected to an oxygen pump is installed inside the air injection pipe. The air pipe of the oxygen pump penetrates through the device main body and the right side panel of the hydrolysis reaction tank.

[0007] Furthermore, an outlet grille plate is arranged on the rear side panel of the first filtration tank. A U-shaped structural plate protruding from the rear end face of the first filtration tank is arranged at the rear of the outlet grille plate. The U-shaped structural plate can be used to guide the wastewater passing through the filtration holes of the outlet grille plate into the second filtration tank, avoiding the leakage caused by the wastewater flowing down along the rear panel of the first filtration tank. At the same time, it can increase the fluidity of the wastewater and improve the fluidity of the wastewater inside the filtration tank. Two rectangular notches are formed on the rear top surface of the first filtration tank. A clamping groove is formed on the outer side of the back plate of the first filtration tank.

[0008] Furthermore, a nanofiltration membrane and a reverse osmosis membrane are installed inside the deep purification tank. The nanofiltration membrane is installed at the rear of the reverse osmosis membrane. The nanofiltration membrane is used to deeply purify the biologically treated wastewater, with an interception molecular weight between -Da, which can effectively remove divalent ions, small molecular organic matter and partial hardness ions in the wastewater, further reduce the salt content and COD of the wastewater, and improve the water quality of the reclaimed water. Finally, the reverse osmosis membrane is used to further treat the deeply purified wastewater to remove most of the salts, organic matter and microorganisms in the water, obtaining high-quality reclaimed water. A water outlet pipe is fixedly connected to the front end of the deep purification tank. The water outlet pipe penetrates through the front panel of the device main body.

[0009] Furthermore, a rectangular opening is formed inside the floating board. T-shaped blocks protruding from the front and rear sides of the rectangular opening are clamped in the sliding grooves on the outer side of the fixed slide rail. A support plate with a top surface lower than that of the floating board is arranged on the outer side of the floating board and inside the rectangular opening. A vertically penetrating through hole is formed inside the support plate. Inside the sensor, there are a liquid level sensing element, a wireless signal transceiver module, and a storage battery. An outer clamping plate is inserted into the sensor. A wedge-shaped block protruding outward is arranged 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 movable distance of the inner spring telescopic rod is greater than the size of the wedge-shaped block protruding from the outer clamping plate. The top of the clamping rod is fixedly connected to a movable clamping plate. A horizontal through hole is formed inside the movable clamping plate. A fixing plate is fixedly arranged on the top surface of the sensor. A horizontal sliding groove is formed inside the fixing plate. The movable clamping plate is clamped in the horizontal sliding groove. Baffles are arranged at both ends of the fixing plate. The movable clamping plate is attached to the inner side surface of the baffle.

[0010] Furthermore, a second clamping column is fixedly connected to the front end surface of the water quality and quantity adjustment tank. The second clamping column is clamped in the rectangular notch on the rear top surface of the second filtration tank, thereby completing the fixed clamping with the second filtration tank. Microfiltration holes are formed in the rear panel of the water quality and quantity adjustment tank. A U-shaped structural plate is welded to the rear end surface of the water quality and quantity adjustment tank outside the outermost microfiltration holes. Similar to the U-shaped structural plate at the rear end of the second filtration tank, it is also used to divert the wastewater into the water quality and quantity adjustment tank, and at the same time, it can increase the fluidity of the wastewater. The microfiltration holes adopt a filter screen with a pore diameter of.-mm to intercept tiny suspended substances and some colloidal substances, reducing the load of the subsequent treatment unit. A slope plate is arranged inside the front panel of the water quality and quantity adjustment tank. The slope plate can be used to divert the dripping wastewater into the water quality and quantity adjustment tank. Two rectangular notches are formed in the rear top surface of the water quality and quantity adjustment tank. A clamping groove is formed in the rear end surface of the water quality and quantity adjustment tank. The end of the adding pipe is connected to the output pipe of the coagulant adding pump. A micro motor is installed outside the adding pipe through a tripod. The driving shaft of the micro motor is coaxially connected to a quantitative baffle. A stirring plate is clamped inside the bottom of the adding pipe.

[0011] Furthermore, a top plate is installed on the top surface of the device main body. The top plate covers the top surfaces of the second filtration tank, the water quality and quantity adjustment tank, the hydrolysis reaction tank, and the deep purification tank. The air pipe of the oxygen pump is hermetically installed in the right side panels of the device main body and the hydrolysis reaction tank, and the air pipe communicates with the air injection pipe at the bottom of the hydrolysis reaction tank. The left side of the hydrolysis reaction tank is an anaerobic hydrolysis acidification tank. The air pipe of the air extraction pump is hermetically installed in the rear side panels of the device main body and the hydrolysis reaction tank, and the air pipe communicates with the inside of the anaerobic hydrolysis acidification tank. And the adding pipe penetrates through the top surface of the top plate.

[0012] Beneficial effects

[0013] According to the embodiments of the present invention, after starting the motor through an external control terminal, the film changing mechanism drives the rotating rod to rotate. When the adsorption film to be replaced is rotated to the upper side to the horizontal state through the toothed belt, the motor is stopped, the clamping rod is pulled out, and then the adsorption film 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 belt to complete the replacement.

[0014] In addition, through hierarchical filtration, quantitative addition of additives, hydrolysis reaction tanks and deep purification tanks, organic matters, nitrogen and phosphorus, heavy metals, chromaticity and other pollutants in the wastewater are deeply removed. The quality of the effluent reaches or exceeds the national discharge standards, greatly reducing environmental pollution and enabling cascade recycling.

[0015] In addition, according to the changes in water quality and water volume, the sensor and the control terminal can automatically adjust the operating parameters of the equipment, reducing energy consumption and chemical dosage. At the same time, the efficient recycling of water resources reduces the intake of fresh water, and the concentrated water recovery and treatment unit realizes the recovery of useful substances, reducing the production cost of enterprises and having significant economic benefits.

[0016] In addition, the entire treatment device has a compact structure, occupies a small area, and has a high degree of integration between each filtration tank and reaction tank. The use of sensors in cooperation with the external control terminal realizes the automation and remote monitoring of the treatment process, reduces manual operation and management costs, improves the operating stability and reliability of the equipment, and is convenient for large-scale popularization and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments will be briefly introduced below.

[0018] The drawings in the following description only relate to some embodiments of the present invention and do not limit the present invention.

[0019] In the drawings:

[0020] Figure 1 is a schematic structural view of the right front side perspective of the overall device of the embodiment of the present invention.

[0021] Figure 2 is a schematic internal structural view of the device main body of the embodiment of the present invention.

[0022] Figure 3 is a schematic unfolded structural view between the first filtration tank, the second filtration tank and the deep purification tank of the embodiment of the present invention.

[0023] Figure 4 is a schematic sectional structural view of the water quality and water volume regulation tank of the embodiment of the present invention.

[0024] Figure 5 is of the embodiment of the present inventionFigure 4 The enlarged structural schematic diagram of location A.

[0025] Figure 6 It is the unfolded structural schematic diagram of the sensing component in the embodiment of the present invention.

[0026] Figure 7 It is the Figure 6 The enlarged structural schematic diagram of location B.

[0027] Figure 8 It is the structural schematic diagram of the hydrolysis reaction tank in the embodiment of the present invention.

[0028] Figure 9 It is the structural schematic diagram of the membrane replacement mechanism in the embodiment of the present invention.

[0029] List of reference numerals

[0030] 1. Device main body; 101. Top plate; 102. Motor support base; 2. First filtration tank; 201. Effluent grille plate; 3. Second filtration tank; 301. First clamping post; 4. Water quality and quantity regulation tank; 401. Second clamping post; 402. Fixed sliding rail; 403. Feeding pipe; 4031. Micro motor; 4032. Quantitative baffle; 4033. Stirring plate; 5. Hydrolysis reaction tank; 501. Connecting clamping plate; 502. Sealing rotating plate; 5021. Counterweight; 503. Third clamping post; 504. Partition plate; 505. Air injection pipe; 6. Deep purification tank; 601. Nanofiltration membrane; 602. Reverse osmosis membrane; 7. Sensing component; 71. Floating plate; 72. Sensor; 7201. Fixed plate; 7202. Movable clamping plate; 72021. Clamping rod; 72022. Inner spring telescopic rod; 7203. Outer clamping plate; 8. Membrane replacement mechanism; 81. Rotating rod; 8101. Sealing sleeve; 82. Tooth transmission belt; 83. Adsorption membrane; 84. Clamping rod. Detailed implementation manners

[0031] In order to make the purpose, solution and advantages of the technical solution of the present invention clearer, the technical solution of the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings of the specific embodiments of the present invention. Unless otherwise specified, the terms used herein have the ordinary meanings in the art. The same reference numerals in the drawings represent the same components.

[0032] Embodiment: Please refer to Figures 1 to 9 as shown in

[0033] The present invention provides a papermaking wastewater treatment device capable of realizing cascade recycling of water resources, including a device main body 1; 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 main body 1, an air extraction pump is installed on the rear side outside the device main body 1, and an oxygen pump is installed on the right side of the device main body 1; the second filter tank 3 is clamped behind the first filter tank 2; the water quality and quantity adjustment tank 4 is clamped behind the second filter tank 3, an adding pipe 403 is installed on the left side of the water quality and quantity adjustment tank 4, and fixed slide rails 402 are fixedly welded on the left and right sides of the inner wall of the water quality and quantity adjustment tank 4; a sensing assembly 7 composed of a floating plate 71 and a sensor 72 is slidably clamped on the fixed slide rails 402; the hydrolysis reaction tank 5 is clamped behind the water quality and quantity adjustment tank 4, a partition plate 504 is fixedly arranged in the middle of the hydrolysis reaction tank 5, the left side of the partition plate 504 is an anaerobic hydrolysis acidification tank, and the right side of the partition plate 504 is an aerobic composite biological reaction tank; the deep purification tank 6 is installed in front of the hydrolysis reaction tank 5 and on the right side of the water quality and quantity adjustment tank 4, and 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 transmission belt 82, an adsorption membrane 83 and a clamping rod 84, the toothed transmission belt 82 is sleeved outside the rotating rod 81, the left toothed transmission belt 82 is installed in the left side panel of the deep purification tank 6, the clamping rod 84 is clamped inside the toothed transmission belt 82, the adsorption membrane 83 is clamped between two opposite clamping rods 84, the end of the rotating rod 81 at the upper rear side is coaxially connected with a motor, and the motor is installed on a motor support seat 102.

[0034] Wherein, gears are respectively fixedly connected to both ends of the rotating rod 81, tooth grooves are formed in the inner wall of the toothed transmission belt 82, the gears are meshed with the toothed transmission belt 82, a sealing sleeve 8101 is sleeved in a groove on the outer wall of the rotating rod 81, and the sealing sleeve 8101 is clamped in the through holes of the device main body 1 and the deep purification tank 6 penetrated by the rotating rod 81. A clamping groove is formed inside the clamping rod 84, and the adsorption membrane 83 is clamped in the clamping groove. After starting the motor through an external control end, the rotating rod 81 is driven to rotate coaxially through a driving shaft, the toothed transmission belt 82 is driven to rotate by gear meshing, and the toothed transmission belt 82 is supported by the other three rotating rods 81. At this time, the clamping rod 84 that needs to clamp the adsorption membrane 83 rotates synchronously with the toothed transmission belt 82. When the adsorption membrane 83 to be replaced rotates to the upper horizontal state, the motor is stopped, the clamping rod 84 is pulled out, and the adsorption membrane 83 can be replaced. After replacement, the clamping rod 84 is inserted back into the deep purification tank 6, and finally the right end of the clamping rod 84 is inserted into the toothed transmission belt 82 to complete the replacement. The adsorption membrane 83 is made of an activated carbon plus nanofiber composite adsorption material. The activated carbon has a rich pore structure and can adsorb pollutants such as organic matters and heavy metals in the wastewater. The nanofiber has a large specific surface area and good adsorption performance, and can intercept fine particles and some dissolved organic matters. When the wastewater passes through the adsorption device, the pollutants are adsorbed and removed by the adsorption material, further purifying the water quality.

[0035] Among them, a first clamping post 301 is fixedly connected to the front end face of the second filtration tank 3. The first clamping post 301 is clamped in the rectangular notch on the rear top surface of the first filtration tank 2. The rear panel of the second filtration tank 3 is provided with filtration holes with a filtration aperture smaller than that of the water outlet grille plate 201. The filtration holes further remove impurities with smaller particles. And behind the filtration holes, a U-shaped structural plate is welded to the rear end face of the second filtration tank 3, which has the same function as the U-shaped structural plate at the rear end of the first filtration tank 2, both of which are to divert the wastewater into the water quality and quantity regulation tank 4, and at the same time can increase the fluidity of the wastewater. Two rectangular notches are opened on the rear top surface of the second filtration tank 3. A clamping plate is welded to the front end face of the second filtration tank 3, and the clamping plate is clamped in the clamping groove on the outer side of the back plate of the first filtration tank 2. And a slope plate is arranged on the inner side of the front panel of the second filtration tank 3. The slope plate can be used to divert the dripping wastewater into the second filtration tank 3, thus avoiding external flow.

[0036] Among them, a top plate 101 is installed on the top surface of the device main body 1. The top plate 101 covers the top surfaces of the second filtration tank 3, the water quality and quantity regulation tank 4, the hydrolysis reaction tank 5, and the deep purification tank 6. The air pipe of the oxygen pump is hermetically installed in the right side panels of the device main body 1 and the hydrolysis reaction tank 5, and the air pipe communicates with the air distribution pipe 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 extraction pump is hermetically installed in the rear side panels of the device main body 1 and the hydrolysis reaction tank 5, and the air pipe communicates with the interior of the anaerobic hydrolysis acidification tank and is placed in the power one. And the top surface of the top plate 101 is penetrated by the adding pipe 403. The top plate 101 is used to seal the various tank compartments inside the device main body 1, avoid causing secondary pollution to the environment, and at the same time can keep the environment inside the tank compartments relatively stable, ensuring the effective monitoring of the wastewater treatment indicators.

[0037] Among them, a connecting clamping plate 501 is welded to the front end face of the hydrolysis reaction tank 5. The connecting clamping plate 501 is clamped in the clamping groove on the rear end face of the water quality and quantity regulation tank 4. A sealing plate is fixedly connected to the top surface of the hydrolysis reaction tank 5. An irregular hole is formed inside the sealing plate. The top of the irregular hole is an incomplete circular hole structure, and the bottom is a complete circular hole structure. A sealing rotating plate 502 is clamped inside the irregular hole. A counterweight block 5021 is arranged at the bottom of the rear side of the sealing rotating plate 502. The top surface of the sealing rotating plate 502 fits against the bottom surface of the incomplete circular hole at the top of the irregular hole. The pool is filled with a new type of polymer anaerobic biological filler, providing a good attachment and growth environment for anaerobic microorganisms. When there is wastewater on the top surface of the sealing rotating plate 502, the wastewater presses the sealing rotating plate 502 to rotate downward. After the wastewater flows to the lower part of the sealing plate, the sealing rotating plate 502 automatically resets under the influence of the counterweight block 5021. The top of the irregular hole is an incomplete circular hole structure, which restricts the rotation of the sealing rotating plate 502. The sealing rotating plate 502 cannot rotate upward, ensuring that its top surface fits against the bottom surface of the irregular hole to seal the irregular hole and ensure an anaerobic environment inside the sealing plate. Under anaerobic conditions, through the action of hydrolytic acidification bacteria, the macromolecular organic matters that are difficult to degrade in the wastewater are decomposed into small molecular organic matters that are easily biodegradable, improving the biodegradability of the wastewater and removing part of the COD at the same time. Denitrifying bacteria use the organic matters in the influent as a carbon source under an anoxic environment to reduce nitrate nitrogen to nitrogen gas, realizing nitrogen removal. A third clamping column 503 is fixedly connected to the front end face of the hydrolysis reaction tank 5. The third clamping column 503 is clamped in the rectangular notch on the rear top surface of the water quality and quantity regulation tank 4. An air injection pipe 505 is installed at the bottom on the right side of the hydrolysis reaction tank 5. Ventilation holes are formed on the outer surface of the air injection pipe 505. An air pipe communicating with an oxygen pump is installed inside the air injection pipe 505. The air pipe of the oxygen pump penetrates through the device main body 1 and the right side panel of the hydrolysis reaction tank 5. After starting the oxygen pump through an external control terminal, oxygen is pumped into the air injection pipe 505 through the air pipe, and the oxygen is evenly delivered to the aerobic composite biological reaction tank on the right side of the hydrolysis reaction tank 5 through the ventilation holes on the air injection pipe 505. At the same time, the wastewater in the reaction tank can be continuously agitated through the ventilation holes to ensure fluidity and increase the oxygen content at the same time. Using the micro-pore aeration method, microorganisms further decompose organic matters under aerobic conditions and carry out nitrification reactions at the same time, converting ammonia nitrogen into nitrate nitrogen.

[0038] Among them, a nanofiltration membrane 601 and a reverse osmosis membrane 602 are installed inside the deep purification tank 6. The nanofiltration membrane 601 is installed at the rear side of the reverse osmosis membrane 602. The nanofiltration membrane 601 is used to deeply purify the wastewater after biological treatment. The molecular weight cut-off is between 100 and 1000 Da. It can effectively remove divalent ions, small-molecule organic substances and partial hardness ions in the wastewater, further reduce the salt content and COD of the wastewater, improve the water quality of the recycled water. Finally, the reverse osmosis membrane 602 is used to further treat the deeply purified wastewater to remove most of the salts, organic substances and microorganisms in the water, obtaining high-quality recycled water. A water outlet pipe is fixedly connected to the front end of the deep purification tank 6. The water outlet pipe penetrates through the front panel of the device main body 1. The deeply purified wastewater is led out through the water outlet pipe and finally flows into the reuse distribution system.

[0039] Among them, an outlet grille plate 201 is arranged on the rear side panel of the first filtration tank 2. A U-shaped structural plate protruding from the rear end face of the first filtration tank 2 is arranged at the rear side of the outlet grille plate 201. The U-shaped structural plate can be used to guide the wastewater passing through the filter holes of the outlet grille plate 201 into the second filtration tank 3, avoiding the leakage caused by the wastewater flowing down along the rear panel of the first filtration tank 2. At the same time, it can increase the fluidity of the wastewater and improve the fluidity of the wastewater inside the filtration tank. Two rectangular notches are opened on the rear top surface of the first filtration tank 2. A clamping groove is opened on the outer side of the back plate of the first filtration tank 2. The outlet grille plate 201 is used to intercept larger floating substances and suspended substances in the wastewater, such as tree bark, fiber bundles, etc.

[0040] Among them, a rectangular opening is provided inside the floating board 71. T-shaped blocks protruding from the front and rear sides of the rectangular opening are clamped in the sliding grooves on the outer side of the fixed slide rail 402. A support plate with a top surface lower than that of the floating board 71 is arranged on the outer side of the floating board 71 and inside the rectangular opening. A vertically penetrating through hole is provided inside the support plate. Inside the sensor 72, a liquid level sensing element, a wireless signal transceiver module, and a storage battery are arranged. An outer clamping plate 7203 is inserted inside the sensor 72. A wedge-shaped block protruding outward is arranged at the bottom of the outer clamping plate 7203. A clamping rod 72021 is connected to the top surface of the wedge-shaped block. An inner spring telescopic rod 72022 is connected between the clamping rod 72021 and the outer clamping plate 7203. The movable distance of the inner spring telescopic rod 72022 is greater than the size of the wedge-shaped block protruding from the outer clamping plate 7203. The top of the clamping rod 72021 is fixedly connected to a movable clamping plate 7202. A transverse through hole is provided inside the movable clamping plate 7202. A fixing plate 7201 is fixedly arranged on the top surface of the sensor 72. A transverse sliding groove is provided inside the fixing plate 7201. The movable clamping plate 7202 is clamped in the transverse sliding groove. Baffles are arranged at both ends of the fixing plate 7201. The movable clamping plate 7202 is attached to the inner side surface of the baffle. After pressing the sensor 72 downward, the outer clamping plate 7203 is passed through the through hole inside the floating board 71. The clamping rod 72021 is maintained at the outermost position through the inner spring telescopic rod 72022, and the wedge-shaped block at the bottom of the outer clamping plate 7203 is maintained at the outermost position, completing the fixed clamping between the sensor 72 and the floating board 71. After wastewater flows into the water quality and water volume regulation tank 4, the floating board 71 is floated by buoyancy, and the support plate drives the sensor 72 to float synchronously. The height of the wastewater is measured through the liquid level sensing element, and online monitoring is carried out on indicators such as the flow rate of the wastewater. The inlet valve is automatically adjusted according to the monitoring data to control the flow rate, so that the water quality and water volume of the wastewater remain relatively stable.

[0041] Among them, a second clamping column 401 is fixedly connected to the front end face of the water quality and quantity regulation tank 4. The second clamping column 401 is clamped in the rectangular notch on the rear top surface of the second filtration tank 3, thus completing the fixed clamping connection with the second filtration tank 3. Microfiltration holes are provided in the rear panel of the water quality and quantity regulation tank 4. Outside the outermost microfiltration holes and on the rear end face of the water quality and quantity regulation tank 4, a U-shaped structural plate is welded. It has the same function as the U-shaped structural plate at the rear end of the second filtration tank 3, which is also to divert the wastewater into the water quality and quantity regulation tank 4, and at the same time can increase the fluidity of the wastewater. The microfiltration holes use a filter screen with a pore diameter of 0.1 - 1 mm to intercept tiny suspended solids and some colloidal substances, reducing the load of the subsequent treatment unit. A slope plate is arranged inside the front panel of the water quality and quantity regulation tank 4. The slope plate can be used to divert the dripping wastewater into the water quality and quantity regulation tank 4. Two rectangular notches are provided on the rear top surface of the water quality and quantity regulation tank 4, and a clamping groove is provided on the rear end face of the water quality and quantity regulation tank 4. The end of the dosing pipe 403 is connected to the output pipe of the coagulant dosing pump. A micro motor 4031 is installed outside the dosing pipe 403 through a tripod. The drive shaft of the micro motor 4031 is coaxially connected with a metering baffle 4032. A stirring plate 4033 is clamped inside the bottom of the dosing pipe 403. After starting the micro motor 4031 by using an external control terminal, the metering baffle 4032 is driven to rotate by the drive shaft, so that the additive can be quantitatively and evenly added. According to the wastewater quality, coagulants and flocculation aids such as polyaluminum chloride (PAC) and polyacrylamide (PAM) are used as additives. After the additive is quantitatively put into the bottom of the dosing pipe 403, it hits the top surface of the stirring plate 4033, stirring the stirring plate 4033 to rotate, thereby increasing the fluidity of the contact position between the wastewater and the additive and realizing uniform mixing. The wastewater undergoes sufficient mixing and reaction in the tank to form larger flocs, realizing solid-liquid separation, effectively removing colloids, some organic substances and suspended solids in the wastewater, and creating good conditions for subsequent treatment.

[0042] The specific implementation manner of the present invention is as follows:

[0043] The papermaking wastewater first enters the first filtration tank 2, and is intercepted and filtered successively through the filter holes of the outlet grille plate 201, the filter holes in the rear panel of the second filtration tank 3, and the microfiltration holes in the rear panel of the water quality and quantity regulation tank 4 to remove larger floating objects and suspended solids. While the wastewater flows into the water quality and quantity regulation tank 4, the height of the wastewater is measured by a liquid level sensing element, and online monitoring of indicators such as the flow rate of the wastewater is carried out. After starting the micro motor 4031 by using an external control terminal, the metering baffle 4032 is driven to rotate by the drive shaft, so that the additive can be quantitatively and evenly added. After the additive is quantitatively put into the bottom of the dosing pipe 403, it hits the top surface of the stirring plate 4033 to stir the stirring plate 4033 to rotate. The wastewater undergoes sufficient mixing and reaction in the tank to form larger flocs, realizing solid-liquid separation;

[0044] Subsequently, the wastewater enters the anaerobic hydrolysis acidification tank. Under the action of anaerobic microorganisms, macromolecular organic substances are decomposed into small-molecular organic substances, and denitrification and nitrogen removal are carried out in the anoxic zone. Then it flows into the aerobic composite biological reaction tank, where organic matter decomposition and nitrification reactions occur in the aerobic zone. Finally, it enters the advanced purification tank 6, and the remaining pollutants are removed by the adsorption membrane 83;

[0045] Finally, the biologically treated wastewater is deeply purified by using the nanofiltration membrane 601 to remove divalent ions, small-molecular organic substances and partial hardness ions in the wastewater, further reduce the salt content and COD of the wastewater, and improve the water quality of the recycled water. Finally, the deeply purified wastewater is further treated by the reverse osmosis membrane 602 to remove most of the salts, organic substances and microorganisms in the water, and high-quality recycled water is obtained.

Claims

1. A papermaking wastewater treatment device capable of realizing cascaded recycling of water resources, comprising: Device main body (1); characterized in that a first filtration tank (2), a second filtration 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 main body (1), an air extraction pump is installed on the rear side outside the device main body (1), an oxygen pump is installed on the right side of the device main body (1), the air pipe of the oxygen pump is hermetically installed in the right side panels of the device main body (1) and the hydrolysis reaction tank (5), and the air pipe communicates with the air injection pipe (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 extraction pump is hermetically installed in the rear side panels of the device main body (1) and the hydrolysis reaction tank (5), and the air pipe communicates with the inside of the anaerobic hydrolysis acidification tank; the second filtration tank (3) is snap-connected to the rear side of the first filtration tank (2); the water quality and quantity adjustment tank (4) is snap-connected to the rear side of the second filtration tank (3), an addition pipe (403) is installed on the left side of the water quality and quantity adjustment 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 adjustment tank (4); a sensing assembly (7) composed of a floating plate (71) and a sensor (72) is slidably snap-connected to the fixed slide rails (402); the hydrolysis reaction tank (5) is snap-connected to the rear side of the water quality and quantity adjustment tank (4), a partition plate (504) is fixedly arranged in the middle of the inside of the hydrolysis reaction tank (5), the left side of the partition plate (504) is an anaerobic hydrolysis acidification tank, and the right side of the partition plate (504) is an aerobic composite biological reaction tank; the deep purification tank (6) is installed on the front side of the hydrolysis reaction tank (5) and the right side of the water quality and quantity adjustment tank (4), and 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 transmission belt (82), an adsorption membrane (83) and a clamping rod (84), the toothed transmission belt (82) is sleeved outside the rotating rod (81), the left toothed transmission belt (82) is installed in the left side panel of the deep purification tank (6), the clamping rod (84) is snap-connected inside the toothed transmission belt (82), the adsorption membrane (83) is clamped between two opposite clamping rods (84), and the end of the rotating rod (81) at the upper rear side is coaxially connected to a motor, and the motor is installed on a motor support seat (102).

2. The papermaking wastewater treatment device capable of realizing cascade recycling of water resources according to claim 1, characterized in that: A top plate (101) is installed on the top surface of the device main body (1), the top plate (101) 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), and the top surface of the top plate (101) is penetrated by the addition pipe (403).

3. The papermaking wastewater treatment device capable of realizing cascade recycling of water resources according to claim 1, characterized in that: An outlet grille plate (201) is arranged on the rear side panel of the first filtration tank (2), a U-shaped structural plate protruding from the rear end surface of the first filtration tank (2) is arranged at the rear side of the outlet grille plate (201), two rectangular notches are opened on the top surface at the rear side of the first filtration tank (2), and a card slot is opened on the outer side of the back plate of the first filtration tank (2).

4. The papermaking wastewater treatment device capable of realizing cascade recycling of water resources according to claim 3, characterized in that: A first clamping post (301) is fixedly connected to the front end face of the second filter tank (3). The first clamping post (301) is clamped in a rectangular notch on the rear top surface of the first filter tank (2). The rear side panel of the second filter tank (3) is provided with filter holes having a smaller filter aperture than the water outlet grille plate (201). And behind the filter holes, a U-shaped structural plate is welded to the rear end face of the second filter tank (3). Two rectangular notches are formed in the rear top surface of the second filter tank (3). A clamping plate is welded to the front end face of the second filter tank (3), and the clamping plate is clamped in a clamping groove on the outer side of the back plate of the first filter tank (2). And a slope plate is arranged on the inner side of the front panel of the second filter tank (3).

5. The papermaking wastewater treatment device capable of realizing cascade recycling of water resources according to claim 4, characterized in that: A second clamping post (401) is fixedly connected to the front end face of the water quality and water quantity regulating tank (4). The second clamping post (401) is clamped in a rectangular notch on the rear top surface of the second filter tank (3). Micro-filter holes are formed in the rear panel of the water quality and water quantity regulating tank (4). A U-shaped structural plate is welded to the rear end face of the water quality and water quantity regulating tank (4) outside the outermost micro-filter holes. A slope plate is arranged on the inner side of the front panel of the water quality and water quantity regulating tank (4). Two rectangular notches are formed in the rear top surface of the water quality and water quantity regulating tank (4). A clamping groove is formed in the rear end face of the water quality and water 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 outside the adding pipe (403) through a support. A quantitative dial plate (4032) is coaxially connected to the driving shaft of the micro motor (4031). A stirring plate (4033) is clamped inside the bottom of the adding pipe (403).

6. The papermaking wastewater treatment device capable of realizing cascade recycling of water resources according to claim 5, characterized in that: A connecting clamping plate (501) is welded to the front end face of the hydrolysis reaction tank (5). The connecting clamping plate (501) is clamped in the clamping groove on the rear end face of the water quality and water quantity regulating tank (4). A sealing plate is fixedly connected to the top surface of the hydrolysis reaction tank (5). An irregular hole is formed inside the sealing plate. The top of the irregular hole is an incomplete circular hole structure and the bottom is a complete circular hole structure. A sealing rotating plate (502) is clamped inside the irregular hole. A counterweight block (5021) is arranged at the bottom of the 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 irregular hole. A third clamping post (503) is fixedly connected to the front end face of the hydrolysis reaction tank (5). The third clamping post (503) is clamped in a rectangular notch on the rear top surface of the water quality and water quantity regulating tank (4). An air blowing pipe (505) is installed at the bottom on the right side of the hydrolysis reaction tank (5). Vent holes are formed on the outer surface of the air blowing pipe (505). An air pipe communicating with an oxygen pump is installed inside the air blowing pipe (505). The air pipe of the oxygen pump penetrates through the device main body (1) and the right panel of the hydrolysis reaction tank (5).

7. The papermaking wastewater treatment device capable of realizing cascade recycling of water resources according to claim 6, characterized in that: A nanofiltration membrane (601) and a reverse osmosis membrane (602) are installed inside the deep purification tank (6). The nanofiltration membrane (601) is installed behind the reverse osmosis membrane (602). A water outlet pipe is fixedly connected to the front end of the deep purification tank (6), and the water outlet pipe penetrates through the front panel of the device main body (1).

8. The papermaking wastewater treatment device capable of realizing cascaded recycling of water resources according to claim 5, wherein: The floating board (71) is internally provided with a rectangular opening. T-shaped blocks protruding are arranged on the front and rear sides of the rectangular opening. The T-shaped blocks are clamped in the sliding grooves on the outer sides of the fixed sliding rails (402). A supporting plate with a top surface lower than that of the floating board (71) is arranged on the outer side of the floating board (71) and in the rectangular opening. A vertically penetrating through hole is opened in the supporting plate. A liquid level sensing element, a wireless signal transceiver module and a storage battery are arranged inside the sensor (72). An outer clamping plate (7203) is inserted inside the sensor (72). A wedge-shaped block protruding outward is arranged at the bottom of the outer clamping plate (7203). A clamping rod (72021) is connected to the top surface of the wedge-shaped block. An inner spring telescopic rod (72022) is connected between the clamping rod (72021) and the outer clamping plate (7203). The movable distance of the inner spring telescopic rod (72022) is greater than the dimension of the wedge-shaped block protruding from the outer clamping plate (7203). The top of the clamping rod (72021) is fixedly connected to a movable clamping plate (7202). A transverse through hole is opened in the movable clamping plate (7202). A fixing plate (7201) is fixedly arranged on the top surface of the sensor (72). A transverse sliding groove is opened in the fixing plate (7201). The movable clamping plate (7202) is clamped in the transverse sliding groove. And baffles are arranged at both ends of the fixing plate (7201). The movable clamping plate (7202) is attached to the inner side surfaces of the baffles.

9. The papermaking wastewater treatment device capable of realizing cascade recycling of water resources according to claim 1, characterized in that: Gears are respectively fixedly connected to both ends of the rotating rod (81). Tooth grooves are opened on the inner wall of the tooth transmission belt (82). The gears are meshed with the tooth grooves on the tooth transmission belt (82). A sealing sleeve (8101) is sleeved on the outer wall of the rotating rod (81) with a groove. The sealing sleeve (8101) is clamped in the through holes of the device main body (1) and the deep purification tank (6) through which the rotating rod (81) passes. A clamping groove is opened inside the clamping rod (84). The adsorption film (83) is clamped in the clamping groove.

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