Papermaking wastewater treatment device and wastewater treatment method

Abstract

The present application relates to a papermaking wastewater treatment device and a wastewater treatment method. The papermaking wastewater treatment device includes a device body; an air conveying device, which is arranged in an aeration tank, and the output end of the air conveying device is connected to an air supply pipe; an aeration pipe, which is laid on the bottom of the aeration tank and is connected to the air supply pipe, and a plurality of aeration heads are arranged on the aeration pipe; a bubble dispersion and dust blocking mechanism, which is arranged in the aeration pipe, and is used to divide the bubbles ejected from the aeration head into a plurality of tiny bubbles, and at the same time, perform dust blocking so that the air holes of the aeration head are not easily blocked; a maintenance mechanism, which is arranged between the aeration tank and the aeration pipe, and is used to drive the aeration pipe to enter or move out of the bottom of the aeration tank. The present application has the effect of breaking up the bubbles generated by the aeration device, making the bubbles more scattered, making the gas fully contact with the wastewater, improving the gas utilization rate, increasing the oxygen content in the wastewater, accelerating the metabolism of aerobic microorganisms to degrade organic matter, and reducing the operating cost.

Description

Technical Field

[0001] The present application relates to the technical field of papermaking wastewater treatment, and in particular to a papermaking wastewater treatment device and a wastewater treatment method. Background Art

[0002] The treatment equipment for papermaking wastewater usually includes a combination of multiple technologies, and different treatment devices are used to remove pollutants in the wastewater to ensure that the pollutants in the wastewater are effectively removed and the discharged water quality meets environmental protection standards.

[0003] At present, papermaking waste gas treatment equipment includes grilles or screens, primary sedimentation tanks, aeration tanks that utilize the metabolism of microorganisms to degrade organic matter, coagulation sedimentation tanks that are used to condense suspended matter and colloidal substances in wastewater into larger particles for subsequent sedimentation or filtration, disinfection equipment that is used to kill bacteria and viruses in wastewater, deep treatment equipment that further removes soluble organic matter and inorganic salts in wastewater (such as reverse osmosis membranes, nanofiltration membranes, etc.), and sludge thickening tanks that are used to treat sludge generated during biological purification. The aeration tank needs to dissolve oxygen into the water through the aeration device to promote the growth of aerobic microorganisms and decompose organic matter in the wastewater. The existing aeration device mainly includes an air compressor for providing the gas required for aeration, an aeration pipe and an aeration head installed at the bottom of the aeration tank, and a valve and a control device for adjusting the air flow and pressure. During aeration, compressed air is transported into the aeration pipe by the air compressor and output through the aeration head. However, the bubbles generated by the existing aeration device are large and not scattered enough, making it difficult to fully mix with the wastewater, which not only leads to a low oxygen content in the wastewater, which is not conducive to the metabolic degradation of organic matter by aerobic microorganisms, but also requires a large ventilation volume, which increases the operating cost. Summary of the invention

[0004] In order to break up the bubbles generated by the aeration device, make the bubbles more scattered, allow the gas to fully contact the wastewater, improve the gas utilization rate, increase the oxygen content in the wastewater, accelerate the metabolism of aerobic microorganisms to degrade organic matter, and reduce operating costs, the present application provides a papermaking wastewater treatment device and a wastewater treatment method.

[0005] The papermaking wastewater treatment device and wastewater treatment method provided in this application adopt the following technical solutions:

[0006] In a first aspect, the present application provides a papermaking wastewater treatment device, comprising:

[0007] The device body includes a grid or screen, a primary sedimentation tank, an aeration tank, a coagulation sedimentation tank, a disinfection device, a deep treatment device, a sludge concentration tank, and a sewage reuse tank;

[0008] An air conveying device is arranged in the aeration tank, and an output end of the air conveying device is connected to an air supply pipeline;

[0009] An aeration pipeline is laid at the bottom of the aeration tank and is connected to the air supply pipeline. The aeration pipeline is provided with a plurality of aeration heads;

[0010] The bubble dispersion and dust blocking mechanism is arranged in the aeration pipeline, and the number is arranged in multiple and corresponds to the multiple aeration heads one by one, and is used to divide the bubbles ejected by the aeration head into multiple tiny bubbles, and at the same time perform dust blocking so that the air holes of the aeration head are not easily blocked;

[0011] The maintenance mechanism is arranged between the aeration tank and the aeration pipe, and is used to drive the aeration pipe into or out of the bottom of the aeration tank.

[0012] By adopting the above technical scheme, when papermaking wastewater is treated, the wastewater first enters the device body, and large suspended solids are removed through a grille or screen. Then, a preliminary solid-liquid separation is performed in a primary sedimentation tank to remove suspended solids in the wastewater. The pretreated wastewater enters the aeration tank, and the air conveying device conveys compressed air to the aeration pipe through the air supply pipe. The aeration head on the aeration pipe releases air into the wastewater in the form of bubbles. The bubble dispersion and dust blocking mechanism divides the large bubbles into multiple tiny bubbles, increases the contact area between the bubbles and the wastewater, increases the oxygen content in the wastewater, and promotes the growth of aerobic microorganisms. The microorganisms degrade the organic matter in the wastewater through metabolism. The wastewater then enters the coagulation sedimentation tank, and the suspended solids and colloidal substances in the wastewater are condensed into larger particles by adding coagulants, which are convenient for subsequent precipitation or filtration. After coagulation and sedimentation, the wastewater enters the disinfection device, and kills bacteria and viruses in the wastewater by chemical or physical methods to ensure the safety of the effluent. The disinfected wastewater enters a deep treatment device, such as a reverse osmosis membrane, a nanofiltration membrane, etc., to further remove soluble organic matter in the wastewater. The sludge generated during the treatment process enters the sludge thickening tank for concentration, dehydration and stabilization to reduce the impact on the environment. The water that meets the reuse standard can be used again for non-production water or part of the production water in the papermaking process to save water resources. The staff can also easily drive the aeration pipe into or out of the bottom of the aeration tank through the maintenance mechanism, which is convenient for the maintenance and maintenance of the aeration device or the dredging of the bottom of the aeration tank to ensure the long-term stable operation of the aeration tank. The air conveying device conveys compressed air to the aeration pipe through the air supply pipe, and the aeration head on the aeration pipe releases the air into the wastewater in the form of bubbles. The scattered bubble dust blocking mechanism divides the large bubbles into multiple tiny bubbles and distributes them randomly, increasing the contact area between the bubbles and the wastewater, improving the oxygen transfer efficiency, making full use of the gas, increasing the oxygen content in the wastewater, and accelerating the metabolism of aerobic microorganisms to degrade organic matter. At the same time, the scattered bubble dust blocking mechanism can also perform dust blocking treatment to prevent the air holes of the aeration head from being blocked, thereby ensuring the stable operation of the aeration system.

[0013] Optionally, the bubble dispersion and dust blocking mechanism includes:

[0014] A fixed frame, fixed to the aeration pipeline;

[0015] A bubble dispersion cage is arranged on a fixed frame and sleeved on the outside of the aeration head, and a plurality of dispersion holes are arranged on the outer wall of the bubble dispersion cage;

[0016] The fixing component is arranged between the fixing frame and the bubble dispersion cage, and is used for fixing the fixing frame and the bubble dispersion cage.

[0017] By adopting the above technical scheme, when the air conveying device conveys compressed air to the aeration pipe through the air supply pipe, the aeration head releases air into the wastewater in the form of bubbles, and the dispersion holes of the scattered bubble cage divide the large bubbles into multiple tiny bubbles, thereby increasing the contact area between the bubbles and the wastewater. The scattered bubble cage also performs dust interception treatment, so that the air holes of the aeration head are not easily blocked by suspended matter in the wastewater, thereby improving the stability of the operation of the aeration system. The scattered bubble dust interception mechanism significantly improves the oxygen transfer efficiency by producing smaller and denser bubbles. Since the bubbles are smaller, the required ventilation volume is reduced, thereby reducing the operating cost. Moreover, the environment in the wastewater pool is relatively harsh. When the aeration head is damaged, aged or blocked, the staff can quickly remove the scattered bubble cage through the fixing assembly, thereby facilitating the replacement or maintenance of the aeration head.

[0018] Optionally, the fixing component includes:

[0019] A fixing rod is fixed to the bubble dispersion cage, and a plurality of fixing rods are provided;

[0020] The locking block is fixed on the fixing frame, and is provided in plurality and corresponds to the plurality of fixing rods one by one. The locking block is provided with a plurality of locking grooves, and the fixing rods can be snapped into the locking grooves.

[0021] By adopting the above technical scheme, when the fixing frame and the bubble cage are fixed by the fixing assembly, the bubble cage is first placed on the fixing frame, and then the bubble cage is rotated, and the bubble cage drives multiple fixing rods to be inserted into the locking groove, so that the bubble cage can be locked; if the bubble cage needs to be disassembled, it is only necessary to rotate the bubble cage in the opposite direction to disengage the fixing rods from the locking groove; the staff only needs to rotate the bubble cage to achieve synchronous unlocking of multiple fixing rods, so that the disassembly and assembly of the bubble dust blocking mechanism becomes simple and quick, which is convenient for regular cleaning and maintenance work, and the fixing rods and the locking groove enable the bubble cage to operate stably during the aeration process, avoid the displacement of the bubble dust blocking mechanism due to vibration or water flow impact, and ensure the aeration efficiency and wastewater treatment effect.

[0022] Optionally, a locking ring is provided on the outer fixing sleeve of the fixing frame, and the locking ring is threadedly connected to the fixing frame.

[0023] By adopting the above technical solution, when the staff turns the locking ring to fix the fixing frame and the bubble cage, the threaded connection can provide a stable tightening force, so that the locking ring is not easily loosened due to vibration or water flow impact, thereby ensuring the stable operation of the aeration system; and the threaded connection will apply a certain pre-tightening force to the locking block, and the operation is simple and convenient.

[0024] Optionally, a plurality of spikes are fixedly provided on the wall of the dispersion hole.

[0025] By adopting the above technical solution, when the bubbles pass through the dispersion holes, the spikes can further cut and break the bubbles, splitting them into smaller microbubbles, thereby improving the dispersion effect of the bubbles and the oxygen transfer efficiency, thereby improving the aeration effect. The spikes can also increase the turbulence of the water flow and promote the mixing of wastewater and bubbles.

[0026] Optionally, the bubble cage includes two symmetrically arranged cage bodies, and the two cage bodies are hinged.

[0027] By adopting the above technical solution, on the one hand, when the staff needs to inspect, clean or maintain the aeration head or the inside of the cage, the hinged design can enable the two cages to be quickly opened for operation; on the other hand, when the fixing assembly fixes the bubble cage, the two cages cooperate with the fixing assembly to form a whole.

[0028] Optionally, the maintenance mechanism includes:

[0029] A support frame is fixed to the aeration tank;

[0030] A lifting screw rod is rotatably connected to the support frame, and a driving motor is provided at the end of the lifting screw rod;

[0031] A lifting threaded sleeve, threadedly connected to the outside of the lifting screw;

[0032] A lifting frame is fixed on the lifting threaded sleeve, and the aeration pipeline is arranged on the lifting frame;

[0033] The guide rod is fixed on the support frame and is slidably connected with the lifting frame.

[0034] By adopting the above technical solution, when the aeration device needs to be inspected, maintained or the bottom of the aeration tank needs to be desilted, the staff first starts the drive motor, which drives the lifting screw to rotate. The lifting threaded sleeve moves up and down along the axis of the lifting screw under the rotation of the lifting screw, and the lifting frame also moves up and down accordingly with the lifting threaded sleeve, thereby driving the aeration pipe to be lifted and lowered. The guide rod is slidably connected to the lifting frame to ensure that the lifting frame remains stable during the lifting process to avoid deviation. The aeration pipe can be lifted out of the aeration tank through the maintenance mechanism, which is convenient for inspection, cleaning and maintenance of the aeration pipe, thereby reducing the difficulty and cost of maintenance.

[0035] Optionally, the air conveying device and the aeration pipe are both provided in plurality, connecting rods are provided between adjacent aeration pipes, and clamps are further provided on the connecting rods, and the clamps are sleeved to the outside of the aeration pipes.

[0036] By adopting the above technical solution, the connecting rod connects adjacent aeration pipes to form a whole, thereby increasing the structural stability of the entire aeration system, preventing the aeration pipes from shifting or shaking under the impact of water flow, ensuring the normal operation of the aeration system, and the aeration pipes can be quickly replaced or installed through the clamps.

[0037] Optionally, a plurality of supporting legs are provided at the bottom of the connecting rod.

[0038] By adopting the above technical solution, the supporting legs keep the aeration head at a certain distance from the bottom of the pool, making it difficult for the aeration head to directly contact the sludge at the bottom of the pool, reducing the risk of sludge blocking the aeration head. The aeration pipe keeps a certain distance from the bottom of the pool, forming a free-flowing space, which is conducive to the rise and diffusion of bubbles, improves the aeration efficiency, and promotes full contact between wastewater and bubbles.

[0039] In a second aspect, the present application also provides a method for treating papermaking wastewater, which is applicable to the above-mentioned papermaking wastewater treatment device and adopts the following technical solution:

[0040] S1. Remove large suspended solids through a grid or screen;

[0041] S2, then carry out preliminary solid-liquid separation in the primary sedimentation tank to remove suspended solids in the wastewater;

[0042] S3, wastewater enters the aeration tank, the air delivery device delivers compressed air to the aeration pipe through the air delivery pipe, the aeration head on the aeration pipe releases the air into the wastewater in the form of bubbles, the bubble dispersion and dust blocking mechanism divides the large bubbles into multiple tiny bubbles, and the microorganisms degrade the organic matter in the wastewater through metabolism;

[0043] S4, the wastewater then enters the coagulation sedimentation tank, where the suspended solids and colloidal substances in the wastewater are condensed into larger particles by adding coagulants;

[0044] S5. After coagulation and sedimentation, the wastewater enters the disinfection device to kill bacteria and viruses in the wastewater through chemical or physical methods;

[0045] S6. The disinfected wastewater enters the deep treatment device to further remove dissolved organic matter and inorganic salts in the wastewater to ensure that the effluent meets the discharge standard or reuse standard;

[0046] S7. The sludge generated during the treatment process enters the sludge thickening tank for concentration, dehydration and stabilization.

[0047] In summary, the present application includes at least one of the following beneficial technical effects:

[0048] 1. The air conveying device delivers compressed air to the aeration pipe through the air delivery pipe. The aeration head on the aeration pipe releases the air into the wastewater in the form of bubbles. The bubble dispersion and dust blocking mechanism divides the large bubbles into multiple tiny bubbles and distributes them randomly, increasing the contact area between the bubbles and the wastewater, improving the oxygen transfer efficiency, making full use of the gas, increasing the oxygen content in the wastewater, and accelerating the metabolism of aerobic microorganisms to degrade organic matter. At the same time, the bubble dispersion and dust blocking mechanism can also perform dust blocking treatment to prevent the air holes of the aeration head from being blocked, thereby ensuring the stable operation of the aeration system;

[0049] 2. The scattered bubble dust blocking mechanism significantly improves the oxygen transfer efficiency by producing smaller and denser bubbles. Since the bubbles are smaller, the required ventilation volume is reduced, thereby reducing the operating cost. In addition, the environment in the wastewater pool is relatively harsh. When the aeration head is damaged, aged or blocked, the staff can quickly remove the scattered bubble cage through the fixing components, which is convenient for replacing or repairing the aeration head.

[0050] 3. In the fixed assembly, the staff only needs to rotate the bubble cage to realize the synchronous unlocking of multiple fixed rods, making the disassembly and assembly of the bubble dust blocking mechanism simple and quick, and convenient for regular cleaning and maintenance. The fixed rods and locking grooves enable the bubble cage to operate stably during the aeration process, avoiding the displacement of the bubble dust blocking mechanism caused by vibration or water flow impact, thus ensuring the aeration efficiency and wastewater treatment effect;

[0051] 4. The locking ring is threadedly connected to the fixing frame. When the staff turns the locking ring to fix the fixing frame to the bubble cage, the threaded connection can provide a stable tightening force, so that the locking ring is not easily loosened due to vibration or water flow impact, thereby ensuring the stable operation of the aeration system; and the threaded connection will apply a certain pre-tightening force to the locking block, and the operation is simple and convenient.

[0052] 5. When the staff needs to inspect, clean or maintain the aeration head or the inside of the cage, the hinged design allows the two cages to be quickly opened for operation; and when the fixing assembly fixes the bubble cage, the two cages cooperate with the fixing assembly to form a whole;

[0053] 6. The staff can also easily drive the aeration pipe into or out of the bottom of the aeration tank through the maintenance mechanism, which is convenient for the inspection and maintenance of the aeration device or the dredging of the bottom of the aeration tank, ensuring the long-term stable operation of the aeration tank and reducing the difficulty and cost of maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] Figure 1 It is a structural schematic diagram of the papermaking wastewater treatment device in this application;

[0055] Figure 2 It is a structural diagram showing the installation process of the scattered bubble dust blocking mechanism;

[0056] Figure 3 It is a schematic diagram showing the local structure of the scattered bubble cage;

[0057] Figure 4 is a schematic diagram showing a partial cross-sectional structure of a fixed component;

[0058] Figure 5 It is a schematic diagram showing the structure of the maintenance mechanism.

[0059] Explanation of the reference numerals: 1. aeration tank; 2. air conveying device; 3. air supply pipe; 4. aeration pipe; 5. aeration head; 6. bubble dispersion and dust blocking mechanism; 61. fixing frame; 62. bubble dispersion cage; 621. cage body; 622. handle; 63. spike; 64. fixing assembly; 641. fixing rod; 642. locking block; 6421. locking groove; 643. locking ring; 7. maintenance mechanism; 71. support frame; 72. lifting screw; 73. driving motor; 74. lifting threaded sleeve; 75. lifting frame; 76. guide rod; 77. connecting rod; 78. clamp; 79. supporting leg. DETAILED DESCRIPTION

[0060] The following is combined with Figure 1-Figure 5 This application is described in further detail.

[0061] The present application discloses a device for treating papermaking wastewater. Figure 1 and Figure 2 The device for treating papermaking wastewater includes a device body, which includes a grille or screen, a primary sedimentation tank, an aeration tank 1, a coagulation sedimentation tank, a disinfection device, a deep treatment device, a sludge concentration tank, and a sewage reuse tank. A plurality of air conveying devices 2 are arranged on the aeration tank 1, and an air supply pipe 3 is connected to the output end of the air conveying device 2. A plurality of aeration pipes 4 are laid on the bottom of the aeration tank 1, and the plurality of aeration pipes 4 correspond to the plurality of air supply pipes 3 one by one and are connected in sequence, and a plurality of aeration heads 5 are arranged on the aeration pipe 4. A plurality of bubble dust blocking mechanisms 6 corresponding to the plurality of aeration heads 5 are also arranged on the aeration pipe 4, and the bubble dust blocking mechanisms 6 are used to divide the bubbles ejected from the aeration head 5 into a plurality of tiny bubbles, and at the same time perform dust blocking treatment so that the air holes of the aeration head 5 are not easily blocked. A maintenance mechanism 7 is arranged between the aeration tank 1 and the aeration pipe 4, and the maintenance mechanism 7 is used to drive the aeration pipe 4 to enter or move out of the bottom of the aeration tank 1.

[0062] When treating papermaking wastewater, the wastewater first enters the device body, and large suspended solids are removed through a grille or screen, followed by a preliminary solid-liquid separation in a primary sedimentation tank to remove suspended solids in the wastewater. The pretreated wastewater enters the aeration tank 1, and the air conveying device 2 conveys compressed air to the aeration pipe 4 through the air supply pipe 3. The aeration head 5 on the aeration pipe 4 releases the air into the wastewater in the form of bubbles. The bubble-dispersing and dust-blocking mechanism 6 divides large bubbles into multiple tiny bubbles, increases the contact area between the bubbles and the wastewater, increases the oxygen content in the wastewater, and promotes the growth of aerobic microorganisms. The microorganisms degrade organic matter in the wastewater through metabolism. The wastewater then enters the coagulation sedimentation tank, and the suspended solids and colloidal substances in the wastewater are condensed into larger particles by adding coagulants, which are convenient for subsequent precipitation or filtration.

[0063] After coagulation and sedimentation, the wastewater enters the disinfection device, where bacteria and viruses in the wastewater are killed by chemical or physical methods to ensure the safety of the effluent. The disinfected wastewater enters the deep treatment device to further remove the dissolved organic matter and inorganic salts in the wastewater to ensure that the effluent meets the discharge standard or reuse standard. The sludge generated during the treatment process enters the sludge concentration tank for concentration, dehydration, and stabilization to reduce the impact on the environment. The water that meets the reuse standard can be used again for non-production water or part of the production water in the papermaking process to save water resources. The staff can also easily drive the aeration pipe 4 into or out of the bottom of the aeration tank 1 through the maintenance mechanism 7, which is convenient for the inspection and maintenance of the aeration device or the dredging of the bottom of the aeration tank 1 to ensure the long-term stable operation of the aeration tank 1.

[0064] In some embodiments, reference Figure 2 and Figure 3 The bubble dust blocking mechanism 6 includes a fixed frame 61 fixed on the aeration pipe 4, and a bubble cage 62 is arranged on the fixed frame 61. The bubble cage 62 is sleeved on the outside of the aeration head 5. The outer wall of the bubble cage 62 is provided with a plurality of dispersion holes, and a plurality of spikes 63 are fixed on the wall of the dispersion holes. When the bubbles pass through the dispersion holes, the spikes 63 are used to further cut and break the bubbles, so that they are split into smaller microbubbles, thereby improving the dispersion effect of the bubbles and the transfer efficiency of oxygen. The spikes 63 can also increase the turbulence of the water flow and promote the mixing of wastewater and bubbles. A fixing component 64 is arranged between the fixed frame 61 and the bubble cage 62, and the fixing component 64 is used to fix the fixed frame 61 and the bubble cage 62.

[0065] For example, refer to Figure 2 and Figure 4The bubble cage 62 includes two symmetrically arranged cages 621, which are hinged; handles 622 are fixed on the two cages 621. When the staff needs to inspect, clean, or maintain the aeration head 5 or the inside of the cage 621, the hinged design allows the two cages 621 to be quickly opened for operation. When the fixing assembly 64 fixes the bubble cage 62, the two cages 621 cooperate with the fixing assembly 64 to form a whole.

[0066] When the air conveying device 2 delivers compressed air to the aeration pipe 4 through the air delivery pipe 3, the aeration head 5 releases the air into the wastewater in the form of bubbles, and the dispersion holes of the bubble cage 62 divide the large bubbles into multiple tiny bubbles, increasing the contact area between the bubbles and the wastewater. The bubble cage 62 also performs dust blocking treatment, so that the air holes of the aeration head 5 are not easily blocked by suspended matter in the wastewater, thereby improving the stability of the aeration system operation. The environment in the wastewater pool is relatively harsh. When the aeration head 5 is damaged, aged or blocked, the staff can quickly remove the bubble cage 62 through the fixing component 64, so as to facilitate the replacement or maintenance of the aeration head 5.

[0067] In some embodiments, reference Figure 2 and Figure 4 The fixing assembly 64 includes a plurality of fixing rods 641 fixed on the outer wall of the bubble cage 62. For example, the fixing rods 641 can be arranged in the horizontal direction. A plurality of locking blocks 642 are fixed on the fixing frame 61. The plurality of fixing rods 641 correspond to the plurality of locking blocks 642 one by one. The locking blocks 642 are provided with a plurality of locking grooves 6421. The fixing rods 641 can be snapped into the locking grooves 6421. A locking ring 643 is fixedly provided on the outer bottom of the fixing frame 61. The locking ring 643 is connected to the fixing frame 61 by threads.

[0068] When fixing the fixing frame 61 and the bubble cage 62 by the fixing assembly 64, the bubble cage 62 is first placed on the fixing frame 61, and then the bubble cage 62 is rotated. On the one hand, the bubble cage 62 drives the plurality of fixing rods 641 to be inserted into the locking groove 6421, and on the other hand, the bubble cage 62 drives the locking ring 643 to be threadedly connected with the fixing frame 61 to achieve the locking of the bubble cage 62; if the bubble cage 62 needs to be disassembled, the bubble cage 62 only needs to be rotated in the opposite direction to make the fixing rod 641 disengage from the locking groove 6421. When the staff rotates the locking ring 643 to fix the fixing frame 61 and the bubble cage 62, the threaded connection can provide a stable tightening force, so that the locking ring 643 is not easy to loosen due to vibration or water flow impact, thereby ensuring the stable operation of the aeration system; and the threaded connection will apply a certain pre-tightening force to the locking block 642, thereby avoiding the displacement of the bubble dust blocking mechanism 6 due to vibration or water flow impact, thereby ensuring the aeration efficiency and wastewater treatment effect.

[0069] In some embodiments, reference Figure 5The maintenance mechanism 7 includes a support frame 71 fixed on the aeration tank 1, and a lifting screw 72 is rotatably connected to the support frame 71, and a driving motor 73 is provided at the end of the lifting screw 72. A lifting threaded sleeve 74 is threadedly connected to the outer side of the lifting screw 72, and a lifting frame 75 is fixed on the lifting threaded sleeve 74, and the aeration pipe 4 is arranged on the lifting frame 75. A guide rod 76 is fixed on the support frame 71, and the guide rod 76 is slidably connected to the lifting frame 75 along the height direction. A connecting rod 77 is provided between adjacent aeration pipes 4, and a clamp 78 is also provided on the connecting rod 77, and the clamp 78 is sleeved to the outer side of the aeration pipe 4. A plurality of supporting legs 79 are provided at the bottom of the connecting rod 77, and the supporting legs 79 keep the aeration head 5 at a certain distance from the bottom of the pool, so that the aeration head 5 is not easily in direct contact with the sludge at the bottom of the pool, reducing the risk of the aeration head 5 being blocked by the sludge. In addition, the aeration pipe 4 keeps a certain distance from the bottom of the pool, so as to form a free-flowing space, which is conducive to the rise and diffusion of bubbles, improves the aeration efficiency, and promotes full contact between the wastewater and the bubbles.

[0070] When the aeration device needs to be inspected, maintained, or the bottom of the aeration tank 1 needs to be desilted, the staff first starts the drive motor 73, which drives the lifting screw 72 to rotate. The lifting threaded sleeve 74 moves up and down along the axis of the lifting screw 72 under the rotation of the lifting screw 72, and the lifting frame 75 also moves up and down accordingly with the lifting threaded sleeve 74, thereby driving the aeration pipe 4 to rise and fall. The guide rod 76 is slidably connected to the lifting frame 75 to ensure that the lifting frame 75 remains stable during the lifting process to avoid displacement. At the same time, the connecting rod 77 connects the adjacent aeration pipes 4 to form a whole, which increases the structural stability of the entire aeration system, prevents the aeration pipe 4 from being offset or shaking under the impact of water flow, ensures the normal operation of the aeration system, and can quickly replace or install the aeration pipe 4 through the clamp 78.

[0071] The present application also discloses a method for treating papermaking wastewater, which is applicable to the above-mentioned papermaking wastewater treatment device and adopts the following technical solution:

[0072] S1. Remove large suspended solids through a grid or screen.

[0073] S2. Then, preliminary solid-liquid separation is carried out in the primary sedimentation tank to remove suspended solids in the wastewater.

[0074] S3, wastewater enters the aeration tank 1, the air conveying device 2 conveys compressed air to the aeration pipe 4 through the air supply pipe 3, the aeration head 5 on the aeration pipe 4 releases the air into the wastewater in the form of bubbles, the bubble dispersion and dust blocking mechanism 6 divides the large bubbles into multiple tiny bubbles, and the microorganisms degrade the organic matter in the wastewater through metabolism.

[0075] S4. The wastewater then enters the coagulation sedimentation tank, where the suspended matter and colloidal substances in the wastewater are condensed into larger particles by adding coagulants.

[0076] S5. After coagulation and sedimentation, the wastewater enters the disinfection device to kill bacteria and viruses in the wastewater through chemical or physical methods.

[0077] S6. The disinfected wastewater enters the deep treatment device to further remove dissolved organic matter and inorganic salts in the wastewater to ensure that the effluent meets the discharge standard or reuse standard.

[0078] S7. The sludge generated during the treatment process enters the sludge thickening tank for concentration, dehydration and stabilization.

[0079] S8. Water that meets the reuse standards enters the reuse pool for other uses.

[0080] S9. Regularly move the aeration pipe 4 out of the bottom of the aeration tank 1 through the maintenance mechanism 7 to perform maintenance or dredging operations on the bottom of the aeration tank 1.

[0081] The implementation principle of a papermaking wastewater treatment device and a wastewater treatment method in the embodiment of the present application is as follows: when treating papermaking wastewater, the wastewater first enters the device body, and large suspended particles are removed through a grid or a screen, and then a preliminary solid-liquid separation is performed in a primary sedimentation tank to remove suspended solids in the wastewater. The pretreated wastewater enters an aeration tank 1, and an air conveying device 2 conveys compressed air to an aeration pipe 4 through an air supply pipe 3. An aeration head 5 on the aeration pipe 4 releases air into the wastewater in the form of bubbles, and a bubble dispersion and dust blocking mechanism 6 divides the large bubbles into multiple tiny bubbles. The bubbles increase the contact area between the bubbles and the wastewater, increase the oxygen content in the wastewater, and promote the growth of aerobic microorganisms. The microorganisms degrade the organic matter in the wastewater through metabolism. The wastewater then enters the coagulation sedimentation tank. By adding coagulants, the suspended matter and colloidal substances in the wastewater are condensed into larger particles, which are convenient for subsequent precipitation or filtration. After coagulation and sedimentation, the wastewater enters the disinfection device, which kills the bacteria and viruses in the wastewater by chemical or physical methods to ensure the safety of the effluent. The disinfected wastewater enters the deep treatment device, such as reverse osmosis membrane, nanofiltration membrane, etc., to further remove waste. The dissolved organic matter and inorganic salts in the water are removed to ensure that the effluent meets the discharge standard or reuse standard. The sludge generated during the treatment process enters the sludge concentration tank for concentration, dehydration and stabilization to reduce the impact on the environment. The water that meets the reuse standard can be used again for non-production water or part of the production water in the papermaking process to save water resources. The staff can also easily drive the aeration pipe 4 into or out of the bottom of the aeration tank 1 through the maintenance mechanism 7, which is convenient for the maintenance and maintenance of the aeration device or the dredging of the bottom of the aeration tank 1 to ensure the long-term stable operation of the aeration tank 1. wherein the air conveying device 2 conveys compressed air to the aeration pipe 4 through the air supply pipe 3; the aeration head 5 on the aeration pipe 4 releases the air into the wastewater in the form of bubbles; the bubble-scattering and dust-blocking mechanism 6 divides the large bubbles into a plurality of tiny bubbles and distributes them randomly, thereby increasing the contact area between the bubbles and the wastewater, improving the oxygen transfer efficiency, making full use of the gas, increasing the oxygen content in the wastewater, accelerating the metabolism of aerobic microorganisms to degrade organic matter; and at the same time, the bubble-scattering and dust-blocking mechanism 6 can also perform dust blocking treatment to prevent the pores of the aeration head 5 from being blocked, thereby ensuring the stable operation of the aeration system.

[0082] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A papermaking wastewater treatment device, characterized in that: include: The device body comprises a grille or screen, a primary sedimentation tank, an aeration tank (1), a coagulation sedimentation tank, a disinfection device, a deep treatment device, a sludge concentration tank, and a sewage reuse tank; An air conveying device (2) is arranged in the aeration tank (1), and an output end of the air conveying device (2) is connected to an air supply pipeline (3); An aeration pipeline (4) is laid at the bottom of the aeration tank (1) and is connected to the air supply pipeline (3). A plurality of aeration heads (5) are provided on the aeration pipeline (4); A bubble dispersing and dust blocking mechanism (6) is arranged in the aeration pipe (4), and is provided in plurality and corresponds one to one with the plurality of aeration heads (5), and is used to divide the bubbles ejected from the aeration head (5) into a plurality of tiny bubbles, and to perform dust blocking processing at the same time so that the air holes of the aeration head (5) are not easily blocked; The maintenance mechanism (7) is arranged between the aeration tank (1) and the aeration pipe (4) and is used to drive the aeration pipe (4) to enter or move out of the bottom of the aeration tank (1); The bubble dispersion and dust blocking mechanism (6) comprises: A fixed frame (61) is fixedly mounted on the aeration pipe (4); A bubble dispersion cage (62) is arranged on the fixing frame (61) and sleeved on the outside of the aeration head (5), and a plurality of dispersion holes are arranged on the outer side wall of the bubble dispersion cage (62); A fixing assembly (64) is disposed between the fixing frame (61) and the bubble dispersion cage (62) and is used to fix the fixing frame (61) and the bubble dispersion cage (62); The fixing assembly (64) comprises: A fixing rod (641) is fixedly mounted on the bubble dispersing cage (62), and a plurality of fixing rods are provided; A locking block (642) is fixedly mounted on the fixing frame (61), and is provided in plurality and corresponds one-to-one with the plurality of fixing rods (641). The locking block (642) is provided with a plurality of locking grooves (6421), and the fixing rods (641) can be snapped into the locking grooves (6421); A locking ring (643) is provided on the outer fixing sleeve of the fixing frame (61), and the locking ring (643) is threadedly connected to the fixing frame (61); The bubble dispersion cage (62) comprises two symmetrically arranged cage bodies (621), and the two cage bodies (621) are hinged; The maintenance mechanism (7) comprises: A support frame (71) is fixedly mounted on the aeration tank (1); A lifting screw rod (72) is rotatably connected to the support frame (71), and a driving motor (73) is disposed at the end of the lifting screw rod (72); A lifting threaded sleeve (74) is threadedly connected to the outside of the lifting screw (72); A lifting frame (75) is fixedly mounted on the lifting threaded sleeve (74), and the aeration pipeline (4) is arranged on the lifting frame (75); A guide rod (76) is fixed to the support frame (71) and is slidably connected to the lifting frame (75); The air conveying device (2) and the aeration pipe (4) are both provided in plurality, and connecting rods (77) are provided between adjacent aeration pipes (4), and a clamp (78) is also provided on the connecting rod (77), and the clamp (78) is sleeved on the outside of the aeration pipe (4); A plurality of supporting legs (79) are provided at the bottom of the connecting rod (77).

2. The papermaking wastewater treatment device according to claim 1, characterized in that: A plurality of spikes (63) are fixedly arranged on the walls of the dispersion holes.

3. A method for treating papermaking wastewater, characterized in that: A papermaking wastewater treatment device applicable to any one of claims 1-2, wherein the treatment method is as follows: S1. Remove large suspended solids through a grid or screen; S2, then carry out preliminary solid-liquid separation in the primary sedimentation tank to remove suspended solids in the wastewater; S3, wastewater enters the aeration tank (1), the air conveying device (2) conveys compressed air to the aeration pipe (4) through the air supply pipe (3), the aeration head (5) on the aeration pipe (4) releases the air into the wastewater in the form of bubbles, the bubble dispersion and dust blocking mechanism (6) divides the large bubbles into a plurality of tiny bubbles, and the microorganisms degrade the organic matter in the wastewater through metabolism; S4, the wastewater then enters the coagulation sedimentation tank, where the suspended solids and colloidal substances in the wastewater are condensed into larger particles by adding coagulants; S5. After coagulation and sedimentation, the wastewater enters the disinfection device to kill bacteria and viruses in the wastewater through chemical or physical methods; S6. The disinfected wastewater enters the deep treatment device to further remove dissolved organic matter and inorganic salts in the wastewater to ensure that the effluent meets the discharge standard or reuse standard; S7. The sludge generated during the treatment process enters the sludge thickening tank for concentration, dehydration and stabilization.

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