A device and process for treating high-concentration organic wastewater

Abstract

The application discloses a high-concentration organic wastewater treatment device and process, relates to the technical field of high-concentration organic wastewater treatment, and comprises an aeration biological tank, the aeration biological tank comprises a tank body and a water outlet tank integrally formed on one side of the tank body, and a water outlet grille is fixed between the tank body and the water outlet tank. The first net frame loaded with the upper layer of ceramsite is periodically moved by the driving assembly, another batch of ceramsite is used to replace the breaking force of the bubbles subjected to aeration, the same batch of upper layer of ceramsite is prevented from being crushed due to long-term bearing of the breaking force of the bubbles, the crushing rate of the ceramsite is reduced, the quantity of dust sinking is reduced, the plugging of the holes of the aeration disc is avoided from the source, meanwhile, the screw pump pumps out the wastewater in the buffer tank and inputs the wastewater into the bottom of the tank body, the punch for inputting the wastewater is at the same horizontal height as the long plate, the change of the water flow makes the long plate rotating in a ring shape, the bristles rotate with the long plate to brush and wash the holes of the aeration disc, and the plugging problem is solved.

Description

Technical Field

[0001] This invention relates to biological treatment equipment and processes for water, wastewater or sewage, and more specifically to the field of high-concentration organic wastewater treatment technology, particularly to a treatment device and process for high-concentration organic wastewater. Background Technology

[0002] Currently, the main methods for treating high-concentration organic wastewater include physical, chemical, and biological methods. Physical methods, such as adsorption and sedimentation, often only remove some pollutants, making it difficult to achieve ideal treatment results. While chemical methods have high degradation efficiency, they may introduce new pollutants during the process and are costly. Biological methods are limited by the biodegradability of the wastewater and are ineffective for treating high-concentration organic wastewater containing toxic and harmful substances. In recent years, membrane treatment technology has been widely used in wastewater treatment due to its advantages such as high separation efficiency, simple operation, and low energy consumption. However, existing membrane-based high-concentration organic wastewater treatment processes suffer from problems such as severe membrane fouling, high treatment costs, short membrane module lifespan, and overall treatment efficiency and effluent quality failing to meet increasingly stringent environmental standards. Therefore, there is an urgent need to develop a new type of high-concentration organic wastewater treatment device and process to overcome the shortcomings of existing technologies and achieve efficient, stable, and economical treatment of high-concentration organic wastewater.

[0003] A search revealed that, for example, Chinese patent literature discloses an aerated biological filter with good purification effect (publication number: CN112079432B), but it still has the following shortcomings in actual use:

[0004] During the backwashing process, the packing particles in the biological filter generate debris. The sedimentation of this debris causes blockage of the aeration holes and the effluent interception grid. Furthermore, the upper packing is partially exposed to the air, and the alternating wet and wet environment accelerates material aging and bubble impact, making it easier for debris to settle in the upper packing. Summary of the Invention

[0005] To address the problem of upper-layer ceramsite being easily crushed by the bursting force of air bubbles, leading to blockage of the aeration disc holes, this application provides a treatment device and process for high-concentration organic wastewater.

[0006] The device and process for treating high-concentration organic wastewater provided in this application adopt the following technical solution:

[0007] A treatment device for high-concentration organic wastewater includes an aerated biological tank. The aerated biological tank includes a tank body and an effluent tank integrally formed on one side of the tank body. An effluent grid is fixed between the tank body and the effluent tank. A sewage inlet pipe and a backwash inlet pipe for water inlet and a sewage outlet pipe and a backwash outlet pipe for water outlet are respectively fixed on the tank body and the effluent tank. A first electric valve is provided on the backwash outlet pipe, and a second electric valve is provided on both the sewage inlet pipe and the backwash inlet pipe. An aeration pipe supplied with air by an aeration blower and several aeration discs fixed and connected to the aeration pipe are fixed at the bottom of the tank body.

[0008] Above several aeration discs in the pool, a third mesh frame, a second mesh frame, and a first mesh frame for loading ceramsite are sequentially mounted from bottom to top via a placement rack. A cleaning mechanism for brushing and unblocking the air outlet holes of the aeration discs is provided between the third mesh frame and the pool body.

[0009] The pool body is equipped with a buffer mechanism for moving the first mesh frame to prevent the ceramsite inside the frame from being subjected to the impact force of bubble bursting for a long time, which would cause the ceramsite to be crushed. The buffer mechanism includes gates that slide on the upper ends of both sides of the pool body while being driven by electric push rods. Buffer pools that are fixedly connected to the pool body are provided on both sides of the gates. The buffer pools are movably connected to the first mesh frame through a drive component.

[0010] By adopting the above technical solution, the periodically moving first mesh frame loaded with upper-layer ceramsite replaces another batch of ceramsite with the rupture force of aeration bubbles, preventing the same batch of upper-layer ceramsite from being crushed due to prolonged exposure to bubble rupture force. This slows down the ceramsite crushing rate, reduces the amount of dust settling, and mitigates the clogging of aeration disc holes from the source. Simultaneously, the slow movement of the first mesh frame loaded with upper-layer ceramsite causes the movement and shedding of poorly active, aging microorganisms, providing space for new membrane growth, achieving benign renewal, and improving microbial decomposition efficiency. Furthermore, the movement of the two first mesh frames does not alter the structure of the three layers of ceramsite within the tank, preventing any changes during the process. This affects the continuity of treatment; the buffer tank is designed to provide buffer time and space for the upper layer of expanded clay granules and their microbial film to work continuously. The growth of new film can be promoted by adding biofilm protectants, and by pumping the wastewater in the buffer tank to the bottom of the tank, the wastewater containing biofilm protectants is pumped to the bottom of the tank and comes into contact with the expanded clay granules below, providing nutrients for the microbial film attached to the expanded clay granules and promoting its growth, making the biofilm activity of all expanded clay granules more uniform; at the same time, the wastewater output at the bottom of the tank is at the same level as the long plate, and the change in water flow causes the ring-shaped long plate to rotate, and the bristles follow the rotation of the long plate to clean the holes of the aeration disc and solve the clogging problem.

[0011] Preferably, the mesh size of the first, second, and third mesh frames is half the minimum particle size of the ceramic particles loaded inside them, and there are two third mesh frames arranged axially side by side, with the spacing between the two third mesh frames being the same as the gate thickness.

[0012] By adopting the above technical solution, the mesh frame design prevents the ceramsite from leaking out of the mesh while reducing the resistance of the mesh frame to the water flow, allowing the water flow to smoothly carry the air bubbles through the mesh to the upper wastewater where they burst.

[0013] Preferably, a mounting bracket for fixing the mounting end of the electric actuator is welded to one side of the pool body, and a connecting plate with both ends fixed to the gate is fixed to the bottom of the movable end of the electric actuator.

[0014] By adopting the above technical solution, the electric actuator controls the opening and closing of the gate. When opening, it provides an interference-free movement path for the first mesh frame. When closing, it isolates the spatial relationship between the buffer pool and the pool body, allowing the ceramic particles in the buffer pool to detach from the work, thus providing space and time for the growth and recovery of the microbial film.

[0015] Preferably, both ends of the gate are integrally formed with protrusions that fit into grooves opened in the inner wall of the pool, and a sealing layer that is fixedly connected to the pool body is provided between the protrusions and the grooves.

[0016] By adopting the above technical solutions, the interlocking connection and the setting of the sealing layer improve the sealing between the gate and the pool body, and avoid water leakage that would reduce the efficiency of wastewater treatment.

[0017] Preferably, two fixed frames are fixedly installed on the side of the buffer pool away from the mounting frame, the drive assembly includes a lead screw rotatably connected between the two fixed frames, a motor for driving the lead screw is fixedly installed on one side of the fixed frame, and two sliders are fixedly connected to the first mesh frame by connecting rods on the lead screw nut;

[0018] Two sliders are axially connected to a slide rod fixed between two fixed frames.

[0019] By adopting the above technical solution, the drive component provides the power for simultaneous translation of the two first mesh frames loaded with upper layer of ceramic particles, and at the same time provides power through the slide rod to make the movement of the first mesh frames more stable.

[0020] Preferably, the unblocking mechanism includes several sets of long plates rotating above the aeration disc and brush bristles fixed below the long plates and in contact with the aeration disc. A cylinder is fixed between each set of long plates, and a rotating shaft is vertically inserted and fixed inside the cylinder. The bottom end of the rotating shaft is rotatably connected to a base plate fixed to the bottom wall of the pool through a bearing. A transmission component for driving each set of long plates is provided on the rotating shaft, and a disturbance component for driving one set of long plates to rotate is provided on the pool.

[0021] By adopting the above technical solution, multiple sets of long plates with bristles rotate, which can clean the holes of the aeration disc during the rotation process and restore the unobstructed flow of the blocked holes.

[0022] Preferably, the disturbance component includes punches fixed to opposite sides of the pool body, and a screw pump fixed and connected between the punches and the buffer pool, wherein a third electric valve is provided between the screw pump and the buffer pool.

[0023] By adopting the above technical solution, the screw pump can not only extract wastewater from the buffer tank, but also change the direction of the input water flow, providing rotational power to each group of ring-shaped long plates, thus avoiding the situation where the long plates themselves are equipped with drive electrical components, which would make them easily damaged and difficult to repair in the wastewater.

[0024] Preferably, when the long plate rotates to a specific position, the straight line where the punch is located is perpendicular to the surface of the folded plate integrally formed on the end of the long plate away from the cylinder.

[0025] By adopting the above technical solution, the folding plate is pushed vertically by the water flow, making the rotation of the long plate more stable and the contact between the brush bristles and the holes of the aeration disc more stable.

[0026] Preferably, the transmission assembly includes a first sprocket and a second sprocket that are keyed to two adjacent rotating shafts respectively. A chain is meshed on the first sprocket and the second sprocket. The first sprocket, the second sprocket, and the chain are all disposed in a sealed box fixed to the bottom wall of the pool. The rotating shaft is vertically inserted through the sealed box.

[0027] By adopting the above technical solution, the sprocket and chain achieve transmission, enabling multiple sets of long plates to rotate without the need for a separate power source.

[0028] A process for treating high-concentration organic wastewater, comprising an apparatus for treating such high-concentration organic wastewater, including:

[0029] S01. High-concentration organic wastewater is initially filtered through a bar screen to remove large floating objects (such as branches, plastics, etc.). Then, it is pumped to a grit chamber by a lift pump. Gravity settling causes sand particles in the wastewater to settle. The sand particles settled at the bottom of the grit chamber are collected by a hydrocyclone separator to a sand-water separator. The separated dry sand is discharged by a screw conveyor, and the separated wastewater is pumped into a regulating tank by a submersible pump.

[0030] S02. The wastewater is kept in equilibrium by the agitator plate in the equalization tank. After the pH value of the wastewater is tested, acid and alkaline additives are added according to the acidity and alkalinity to control the pH value of the wastewater between 6 and 9. Then, the adjusted wastewater is transported to the hydrolysis acidification tank by the lift pump.

[0031] S03. After the wastewater enters the hydrolysis acidification tank, the large molecular organic matter that is difficult to biodegrade is decomposed into small molecular organic matter. At the same time, the ratio of biochemical oxygen demand to chemical oxygen demand of the wastewater is reduced and increased to above 0.4. The second electric valve on the wastewater inlet pipe of the aerated biological tank is opened and the wastewater is transported into the tank through the submersible pump.

[0032] S04. The aeration blower is operated to oxygenate the tank through the aeration pipe and aeration disc in sequence. The aerobic microbial community attached to the surface of the ceramsite uses the organic matter in the wastewater as a carbon source to convert ammonia nitrogen into nitrate nitrogen. After treatment, the wastewater enters the effluent tank through the effluent screen and is pumped into the membrane reactor through the sewage effluent pipe. The second electric valve on the backwash inlet pipe is opened, and water is supplied to the backwash inlet pipe through the external water source. The water flow washes away the excess biofilm and suspended sludge on the surface of the ceramsite. The first electric valve on the backwash outlet pipe is opened, and the wastewater with excess biofilm and suspended sludge is output from the backwash outlet pipe.

[0033] S05. On a monthly cycle, the movable end of the electric actuator retracts, the gate moves upward, and the wastewater is dispersed into the buffer tanks on both sides. The motor drives the lead screw to rotate, and the slider drives the two first screen frames containing ceramsite to move simultaneously through the threaded transmission. The first screen frame in the buffer tank moves to the top of the second screen frame, and the first screen frame at the top of the original second screen frame moves to another buffer tank. Then, the movable end of the electric actuator is extended to close the gate. After the bubbles output by the aeration disc burst, they come into contact with the ceramsite in the newly replaced first screen frame.

[0034] S06. Add biofilm protectant to the buffer tank to restore the activity of aerobic microbial community during long-term decomposition. Open the third electric valve and the screw pump will pump the wastewater containing biofilm protectant into the bottom of the tank to provide activity to the microbial film of the ceramic particles at the bottom of the tank. The wastewater containing biofilm protectant will be sprayed out from the nozzle, changing the direction of water flow. The long plate will rotate with the water flow. When the baffle plate is perpendicular to the water flow sprayed from the nozzle, the long plate will rotate stably. The bristles will brush the air holes of the aeration disc with the long plate. The wastewater will continue to pass through the three layers of ceramic particles into the effluent tank and flow out from the sewage effluent pipe and be transported to the membrane reactor.

[0035] S07. The membrane reactor throttles the activated sludge and macromolecular pollutants in the wastewater. Microorganisms in the membrane further degrade organic matter and ammonia nitrogen. The purified water is transported to the subsequent disinfection unit by a suction pump. After meeting the standards, it is discharged or reused. The activated sludge is discharged by a sludge discharge pump. The remaining sludge is dewatered by a plate and frame filter press and then transported off-site for disposal.

[0036] In summary, this application includes at least one of the following beneficial technical effects:

[0037] 1. The first mesh frame loaded with upper layer of ceramsite is periodically moved by the drive component, and another batch of ceramsite replaces the rupture force of the aeration bubbles. This avoids the same batch of upper layer ceramsite being crushed by the rupture force of bubbles for a long time, thus slowing down the crushing rate of ceramsite and reducing the amount of dust settling. This reduces the possibility of clogging of the aeration disc holes from the source. At the same time, the screw pump extracts wastewater from the buffer tank and inputs it to the bottom of the tank. The jet of the input wastewater is at the same level as the long plate. The change in water flow causes the ring-shaped long plate to rotate. The bristles follow the rotation of the long plate to clean the holes of the aeration disc and solve the clogging problem.

[0038] 2. By maintaining relative stillness through the movement of the two first mesh frames, the structure of the three layers of ceramsite in the tank remains unchanged during the movement, thus not affecting the continuity of high-concentration organic wastewater treatment in the tank;

[0039] 3. During the slow movement of the first mesh frame loaded with upper-layer ceramic particles, aging microorganisms with poor activity are moved and detached, providing space for the growth of new membranes, achieving benign renewal, and improving the efficiency of microbial decomposition. The buffer tank is set up to provide buffer time and space for the upper-layer ceramic particles and the microbial membrane on them that have been working for a long time. The growth of new membranes can be promoted by adding biofilm protectants. By pumping the wastewater in the buffer tank to the bottom of the tank, the wastewater containing biofilm protectants is pumped to the bottom of the tank and comes into contact with the ceramic particles below, providing nutrients for the microbial membrane attached to the lower ceramic particles to promote growth, making the biofilm activity of all ceramic particles more uniform. Attached Figure Description

[0040] Figure 1 This is a schematic diagram of the organic wastewater treatment process of this application;

[0041] Figure 2 This is a structural diagram of the overall structure of this application;

[0042] Figure 3 This is a partial schematic diagram of the aerated biological tank in this application;

[0043] Figure 4 This is a schematic diagram of the structure of the first wireframe in this application;

[0044] Figure 5 This is a schematic diagram of the structure of the first mesh frame of this application, which moves horizontally via a motor and a lead screw.

[0045] Figure 6 for Figure 5 Enlarged view of the structure at point A in the middle;

[0046] Figure 7 This is a schematic diagram of the structure in this application in which two sliders are axially inserted through the slider.

[0047] Figure 8This is a schematic diagram of the structure in which the liquid in the buffer tank of this application is pumped into the lower part of the tank body via a screw pump;

[0048] Figure 9 This is a schematic diagram of the structure in the dredging mechanism of this application, showing the chassis fixed to the bottom wall of the pool.

[0049] Figure 10 This is a schematic diagram of the structure of the brush bristles contacting the aeration disc above the aeration disc in this application;

[0050] Figure 11 This is a schematic diagram of the structure in this application where the punch and the folding plate are perpendicular to each other;

[0051] Figure 12 This is a schematic diagram of the structure of the two rotating shafts in this application, which are driven by a sprocket and a chain.

[0052] Figure 13 This is a schematic diagram of the structure in this application where the rotating shaft rotates above the chassis via bearings.

[0053] Attached reference numerals: 1. Aerated biological tank; 101. Tank body; 102. Effluent bar; 103. Effluent tank; 104. Backwash effluent pipe; 105. First electric valve; 106. Sewage inlet pipe; 107. Second electric valve;

[0054] 108. Backwash inlet pipe; 109. Sewage outlet pipe; 110. Ceramsite; 111. Aeration pipe; 112. Aeration disc; 113. First mesh frame; 114. Placement rack; 115. Second mesh frame; 116. Third mesh frame;

[0055] 2. Aeration blower;

[0056] 3. Buffer mechanism; 301. Mounting bracket; 302. Electric actuator; 303. Connecting plate; 304. Gate; 305. Protrusion; 306. Groove; 307. Sealing layer; 308. Buffer pool; 309. Fixing bracket; 310. Motor;

[0057] 311. Lead screw; 312. Slide rod; 313. Slider; 314. Connecting rod;

[0058] 4. Unblocking mechanism; 401. Third electric valve; 402. Screw pump; 403. Punch; 404. Chassis; 405. Sealing box; 406. Cylinder; 407. Long plate; 408. Folding plate; 409. Brush;

[0059] 410. Bearing; 411. Shaft; 412. First sprocket; 413. Chain; 414. Second sprocket. Detailed Implementation

[0060] The following is in conjunction with the appendix Figures 1-13 This application will be described in further detail.

[0061] This application discloses an apparatus and process for treating high-concentration organic wastewater.

[0062] Reference Figure 2 , Figure 3 A treatment device for high-concentration organic wastewater includes an aerated biological tank 1, which includes a tank body 101. The tank body 101 is made of carbon steel and coated with anti-rust paint. An effluent tank 103 is integrally formed on one side of the tank body 101. A water passage hole is provided between the tank body 101 and the effluent tank 103. An effluent grid 102 is fixed on the water passage hole at the side wall of the tank body 101. An aeration blower 2 is placed on the ground on the side of the tank body 101 away from the effluent tank 103. An aeration pipe 111 is connected to the output end of the aeration blower 2 through a flange. One end of the aeration pipe 111 passes through and is sealed and fixed to the side wall of the tank body 101 through the flange. The other end of the aeration pipe 111 is fixed and connected to several aeration discs 112. The aeration blower 2 is a Reitz EXPL50-06.

[0063] A sewage inlet pipe 106 is fixed to the side of the tank body 101 near the aeration blower 2 via a flange. The height of the sewage inlet pipe 106 is between the bottom wall of the tank body 101 and the aeration pipe 111. A backwash inlet pipe 108 is connected to the tank body 101 on the same side as the sewage inlet pipe 106 via a flange. The height of the backwash inlet pipe 108 is between the sewage inlet pipe 106 and the aeration pipe 111. A second electric valve 107 is connected to both the sewage inlet pipe 106 and the backwash inlet pipe 108 via flanges. A sewage outlet pipe 109 is fixed to the side of the effluent tank 103 away from the sewage inlet pipe 106 via a flange. A backwash outlet pipe 104 is fixed to the bottom of the effluent tank 103 via a flange. A first electric valve 105 is connected to the backwash outlet pipe 104 via a flange. Both the first electric valve 105 and the second electric valve 107 are R&D Q941 electric ball valves.

[0064] Reference Figures 2-5Inside the pool body 101, above several aeration discs 112, a placement frame 114 is welded with reinforcing ribs. A third mesh frame 116 is placed on the placement frame 114. Above the third mesh frame 116 is a second mesh frame 115. Above the second mesh frame 115 is a first mesh frame 113. The second mesh frame 115 and the third mesh frame 116 are in close contact with the inner wall of the pool body 101. There are two first mesh frames 113, arranged axially side-by-side. The first mesh frame 113 is located directly above the second mesh frame 115, and the first mesh frame 113 is in close contact with the gate 304 and the inner wall of the pool 101 on all four sides. The other one is located inside the buffer pool 308. The distance between the two third mesh frames 116 is the same as the thickness of the gate 304. The first mesh frame 113, the second mesh frame 115 and the third mesh frame 116 are all made of 304 stainless steel. The first mesh frame 113, the second mesh frame 115 and the third mesh frame 116 are all filled with ceramic 110.

[0065] The first mesh frame 113 contains ceramsite 110 with a particle size of 5mm and a stacking thickness of 1.2m. The second mesh frame 115 contains ceramsite 110 with a particle size of 10mm and a stacking thickness of 1m. The third mesh frame 116 contains ceramsite 110 with a particle size of 17mm and a stacking thickness of 1.5m. The mesh size of the first mesh frame 113, the second mesh frame 115, and the third mesh frame 116 is half the minimum particle size of the ceramsite 110 loaded in each frame. A cleaning mechanism 4 for brushing and cleaning the air outlet of the aeration disc 112 is provided between the third mesh frame 116 and the pool body 101.

[0066] Reference Figures 5-7 The pool body 101 is equipped with a buffer mechanism 3 for moving the first mesh frame 113 to prevent the ceramsite 110 inside the frame from being crushed due to the long-term impact of bubble bursting. The buffer mechanism 3 includes gates 304 that slide on the upper ends of both sides of the pool body 101 while being driven by an electric actuator 302. A mounting frame 301 is welded to one side of the pool body 101. The mounting end of the electric actuator 302 is fixed to the top of the mounting frame 301 by bolts. The electric actuator 302 is a Bide 120-10-300. A connecting plate 303 is fixed to the bottom of the movable end of the electric actuator 302 by bolts. Both ends of the connecting plate 303 are connected to the gates 304. The gate 304 is fixedly connected by bolts. Both ends of the gate 304 near the pool body 101 have integrally formed protrusions 305. The inner wall of the pool body 101 has a groove 306. The groove 306 is opposite to and fits the protrusion 305. A sealing layer 307 is pasted in the groove 306. The sealing layer 307 is made of ethylene-vinyl acetate copolymer. Two buffer pools 308 are symmetrically distributed axially on the pool body 101. Both buffer pools 308 are welded to the pool body 101. The two buffer pools 308 are movably connected to the first mesh frame 113 through a drive assembly. A fixing frame 309 is welded to the side of the two buffer pools 308 away from the mounting frame 301.

[0067] The drive assembly includes a motor 310, which is bolted to one of the mounting brackets 309. The motor 310 is a SEWW-BE32B industrial geared motor. The output end of the motor 310 is fixed to a lead screw 311 via a coupling. The coupling is located in a through hole on the mounting bracket 309 for the output end of the motor 310 to pass through. The edges of the coupling housing do not extend beyond the outer surface of the mounting bracket 309. Two nuts are threaded onto the lead screw 311. Both nuts are bolted to sliders 313. A connecting rod 314 is welded to the bottom of the slider 313. The end of the connecting rod 314 away from the slider 313 is bolted to the first mesh frame 113. Both sliders 313 have axially opened sliding holes, and a sliding rod 312 passes through the sliding holes. The sliding rod 312 is fixed between the two mounting brackets 309.

[0068] When replacing the two first mesh frames 113, the movable end of the electric push rod 302 retracts, the connecting plate 303 moves upward with the movable end of the electric push rod 302, the gate 304 moves upward with the connecting plate 303, and the protrusion 305 slides upward with the connecting plate 303 within the sealing layer 307 and the groove 306. At this time, the wastewater above flows into the buffer tank 308. After the movable end of the electric push rod 302 is fully retracted, the gate 304 disengages from the tank body 101, and the distance between the bottom of the gate 304 and the upper surface of the tank body 101 is sufficient for the slider 313 to pass through. The running motor 31... When the motor 310 rotates, the lead screw 311 rotates with the output end of the motor 310. The two nuts on the lead screw 311 generate threaded transmission with the lead screw 311, and the two nuts move synchronously in a linear motion. The slider 313 moves in a linear motion with the nuts, and the connecting rod 314 moves with the slider 313. The first mesh frame 113 moves with the connecting rod 314, and the first mesh frame 113 in the buffer pool 308 moves to above the second mesh frame 115. The first mesh frame 113 above the original second mesh frame 115 moves to another buffer pool 308, realizing the replacement of the first mesh frame 113.

[0069] Reference Figures 8-11 The unblocking mechanism 4 includes several sets of long plates 407 rotating above the aeration disc 112. Each set of long plates 407 consists of five or more long plates 407 arranged in a ring. A cylinder 406 is welded between each set of long plates 407. Brush bristles 409 are attached to the bottom of each long plate 407. The brush bristles 409 are made of nylon and are in contact with the upper surface of the aeration disc 112. A rotating shaft 411 is vertically inserted inside the cylinder 406 and is welded and fixed to the cylinder 406. The bottom end of the rotating shaft 411 is keyed to the inner ring of the bearing 410. The outer ring of the bearing 410 is fixed to the base 404 by bearing seat bolts. The base 404 is fixed to the bottom wall of the pool body 101. The bearing 410 is a ball bearing including an inner ring, an outer ring, and a ball structure. The bearing 410 is made of high carbon chromium bearing steel.

[0070] A transmission assembly for driving each set of long plates 407 is provided on the rotating shaft 411. The transmission assembly includes a first sprocket 412 and a second sprocket 414 respectively keyed to two adjacent rotating shafts 411. A chain 413 is meshed on the first sprocket 412 and the second sprocket 414. A sealing box 405 is fixed to the bottom of the pool body 101 by bolts. The first sprocket 412, the second sprocket 414 and the chain 413 are located inside the sealing box 405. The rotating shaft 411 is vertically inserted through the sealing box 405. The rotating shaft 411 and the sealing box 405 are sealed by a double-lip skeleton oil seal, which achieves sealing while keeping the rotating shaft 411 rotatable. O-rings are placed between the rotating shaft 411 and the double-lip skeleton oil seal, and between the double-lip skeleton oil seal and the sealing box 405 to improve the sealing performance.

[0071] The pool body 101 is equipped with a disturbance component for driving the rotation of one set of long plates 407. The disturbance component includes punches 403 fixed to opposite sides of the pool body 101. The punches 403 are outlet heads made of 304 stainless steel. A screw pump 402 is placed on the ground below the bottom of the buffer pool 308. The screw pump 402 is made of Knifelling CLG025BN06ZFMS. The output end of the screw pump 402 is connected to the flange of the punches 403. An outlet is opened at the bottom of the buffer pool 308, and a third electric valve 401 is fixed to the outlet via a flange. The model of the third electric valve 401 is the same as that of the first electric valve 1. 05 and the second electric valve 107 are the same model, and the bottom wall of the buffer pool 308 is inclined towards the outlet. The input end of the screw pump 402 is connected to the flange of the third electric valve 401 away from the outlet. The long plate 407 has an integrally formed folding plate 408 at the end away from the cylinder 406. The angle between the plane of the folding plate 408 and the plane of the long plate 407 is 150°. The long plate 407, folding plate 408, rotating shaft 411, cylinder 406 and chassis 404 are all made of 304 stainless steel. When the long plate 407 is rotated to a specific position, the straight line of the punch 403 is perpendicular to the plane of the folding plate 408.

[0072] After the gate 304 is closed, a polysaccharide biofilm protectant is added to the buffer tank 308. After the addition, the quality of the biofilm on the surface of the ceramsite 110 in the first mesh frame 113 in the buffer tank 308 is monitored by an external device or manually. After the quality is qualified, the wastewater in the buffer tank 308 is pumped in by the screw pump 402 and fed into the bottom of the tank body 101 through the punch 403. At this time, there is water in the buffer tank 308 that is flush with the upper surface of the first mesh frame 113. The wastewater contains the polysaccharide biofilm protectant that has been added and can be applied to the ceramsite 110 in the third mesh frame 116 and the second mesh frame 115. The water output by the punch 403 disturbs the water flow at the bottom of the tank body 101, causing the set of long plates 407 closest to the punch 403 to rotate. The cylinder 406 rotates with the long plate 407, the rotating shaft 411 rotates with the cylinder 406, and the movable end of the bearing 410 rotates with the rotating shaft 411.

[0073] When the baffle plate 408 rotates to a position perpendicular to the water jet from the punch 403, the force of the water jet from the punch 403 causes the baffle plate 408 to rotate around the pivot 411. The long plate 407 rotates with the baffle plate 408, achieving stable rotation of the long plate 407. The first sprocket 412 located on the rotating pivot 411 rotates, and the chain 413 transmits the force of the rotation of the first sprocket 412 to the second sprocket 414. The second sprocket 414 drives the pivot 411 connected to it to rotate, realizing the rotation of each set of long plates 407 in the pool 101. The bristles 409 brush the surface of the aeration disc 112 as the long plate 407 rotates, which can brush out impurities in the air holes on the surface of the aeration disc 112.

[0074] Reference Figure 1 A process for treating high-concentration organic wastewater, using the aforementioned treatment device for high-concentration organic wastewater, includes:

[0075] S01. High-concentration organic wastewater is initially filtered through a bar screen to remove large floating objects (such as branches, plastics, etc.). Then, it is pumped to a grit chamber by a lift pump. Utilizing the principle of gravity settling, sand particles in the wastewater are deposited. The sand particles deposited at the bottom of the grit chamber are collected by a hydrocyclone separator and sent to a sand-water separator. The separated dry sand is discharged by a screw conveyor, and the separated wastewater is pumped into a regulating tank by a submersible pump.

[0076] S02. The wastewater is kept in equilibrium by the agitator plate in the equalization tank. After the pH value of the wastewater is tested, acid and alkaline additives are added according to the acidity and alkalinity to control the pH value of the wastewater between 6 and 9. Then, the adjusted wastewater is transported to the hydrolysis acidification tank by the lift pump.

[0077] S03. After the wastewater enters the hydrolysis acidification tank, the tank is an anaerobic or hypoxic environment with dissolved oxygen ≤0.5mg / L. The large molecular organic matter that is difficult to biodegrade is decomposed into small molecular organic matter. At the same time, the ratio of biochemical oxygen demand to chemical oxygen demand of the wastewater is reduced and increased to above 0.4. The second electric valve 107 on the wastewater inlet pipe 106 of the aerated biological tank 1 is opened and the wastewater is transported to the tank body 101 by a submersible pump.

[0078] S04. The aeration blower 2 is operated to sequentially fill the tank 101 with oxygen through the aeration pipe 111 and the aeration disc 112. The dissolved oxygen is controlled at 2-4 mg / L by adjusting the aeration blower 2. The aerobic microbial community attached to the surface of the ceramsite 110 uses the organic matter in the wastewater as a carbon source and decomposes the organic matter in the wastewater into water and carbon dioxide through metabolism. It also converts ammonia nitrogen into nitrate nitrogen. After treatment, the wastewater enters the effluent tank 103 through the effluent screen 102 and is drawn into the membrane reactor through the sewage effluent pipe 109. The second electric valve 107 on the backwash inlet pipe 108 is opened, and water is supplied to the backwash inlet pipe 108 through an external water source. The water flow washes away the excess biofilm and suspended sludge on the surface of the ceramsite 110. The first electric valve 105 on the backwash outlet pipe 104 is opened, and the wastewater with excess biofilm and suspended sludge is output from the backwash outlet pipe 104.

[0079] S05. On a monthly cycle, the movable end of the electric actuator 302 retracts, the gate 304 moves upward, and the wastewater is dispersed into the two buffer pools 308. The motor 310 drives the lead screw 311 to rotate, and the slider 313 drives the two first mesh frames 113 containing ceramsite 110 to move simultaneously through the threaded transmission. The first mesh frame 113 in the buffer pool 308 moves to the top of the second mesh frame 115, and the first mesh frame 113 at the top of the original second mesh frame 115 moves to another buffer pool 308. Then the movable end of the electric actuator 302 is extended to close the gate 304. After the bubbles output by the aeration disc 112 burst, they come into contact with the ceramsite 110 in the newly replaced first mesh frame 113.

[0080] S06. Add biofilm protectant to buffer tank 308 to restore the activity of aerobic microbial community during long-term decomposition until the biofilm thickness uniformly covers the surface of the ceramsite and stabilizes at 200-500μm. Open the third electric valve 401 and the screw pump 402 pumps the wastewater containing biofilm protectant in buffer tank 308 into the bottom of tank body 101 to provide activity to the microbial film of ceramsite 110 at the bottom of tank body 101. The wastewater containing biofilm protectant is sprayed out from the punch 403, changing the direction of water flow. The long plate 407 rotates with the water flow. When the baffle 408 is perpendicular to the water flow sprayed from the punch 403, the long plate 407 rotates stably. The brush 409 brushes the air outlet of aeration disc 112 with the long plate 407. The wastewater continues to enter the effluent tank 103 through the three layers of ceramsite 110 and flows out from the sewage outlet pipe 109 and is transported to the membrane reactor.

[0081] S07. The membrane reactor removes activated sludge and macromolecular pollutants from the wastewater. Microorganisms inside the membrane further degrade organic matter and ammonia nitrogen. The purified water is pumped to the subsequent disinfection unit for ultraviolet disinfection. After meeting the standards, the water is discharged or reused. The activated sludge is discharged through a sludge discharge pump. The remaining sludge is dewatered by a plate and frame filter press and then transported off-site for disposal.

[0082] It should be noted that in the above-mentioned high-concentration organic wastewater treatment process, the structure and principle of the grit chamber, equalization tank, hydrolysis acidification tank, membrane reactor, and their supporting electric equipment are all existing technologies and are external equipment in the above process.

[0083] The above are merely optional embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A device for treating high concentration organic wastewater, characterized by: The utility model provides an aerated biological tank (1), the aerated biological tank (1) includes pool body (101) and the water tank (103) of integrative moulding on one side of pool body (101), the water tank (103) is fixed with the water grid (102) between pool body (101), the pool body (101) and water tank (103) are respectively fixed with sewage inlet pipe (106) for water inlet, backwash inlet pipe (108) and sewage outlet pipe (109) for water outlet, backwash outlet pipe (104) for water outlet on, the backwash outlet pipe (104) is equipped with first electric valve (105) and sewage inlet pipe (106) and backwash inlet pipe (108) are equipped with second electric valve (107) on, the pool body (101) bottom is fixed with the aeration pipeline (111) of aeration fan (2) air supply and the aeration disc (112) of a plurality of fixed and communicated on aeration pipeline (111); The third net frame (116) is equipped with the through placing frame (114) from below to above and is sequentially erected with second net frame (115) and first net frame (113) for loading ceramsite (110) above a plurality of aeration discs (112) in pool body (101), the third net frame (116) is equipped with dredging mechanism (4) for brushing and dredging aeration disc (112) air outlet hole between pool body (101); The pool body (101) is equipped with the buffer mechanism (3) for moving first net frame (113) to avoid the ceramsite (110) in frame long-term withstands the bubble break impact force and leads to ceramsite to be pulverized, the buffer mechanism (3) includes the gate (304) of sliding on the both sides upper end of pool body (101) by electric push rod (302) drive, the gate (304) opposite both sides are equipped with the buffer pool (308) of fixed connection with pool body (101), the buffer pool (308) is in the movable connection with first net frame (113) through drive assembly in; The pool body (101) one side is welded with the mounting bracket (301) for fixed installation electric push rod (302) installation end, and the connecting plate (303) of both ends fixed with gate (304) is fixed on the bottom of electric push rod (302) movable end, the buffer pool (308) is fixedly installed with two fixed frames (309) away from mounting bracket (301) one side, the drive assembly includes the lead screw (311) of rotation connection between two fixed frames (309), the fixed frame (309) one side is fixedly installed with the motor (310) for driving lead screw (311), the nut of lead screw (311) is fixed with two sliding blocks (313) of fixed connection with first net frame (113) through connecting rod (314); Two sliding blocks (313) axial are equipped with the slide bar (312) of fixed between two fixed frames (309); The dredging mechanism (4) comprises a plurality of groups of long plates (407) rotating above the aerator disc (112) and brush hairs (409) fixed below the long plates (407) and in contact with the aerator disc (112), a cylinder (406) is fixed between each group of long plates (407), a rotating shaft (411) is vertically arranged and fixed in the cylinder (406), the bottom end of the rotating shaft (411) is rotatably connected to a bottom disc (404) fixed to the bottom wall of the pool body (101) through a bearing (410), a transmission assembly for driving each group of long plates (407) is arranged on the rotating shaft (411), and a disturbance assembly for driving one group of long plates (407) to rotate is arranged on the pool body (101).

2. The device for treating high-concentration organic wastewater according to claim 1, characterized in that: The first mesh frame (113), the second mesh frame (115) and the third mesh frame (116) have a mesh size of 1 / 2 of the minimum particle size of the ceramsite (110) loaded therein, the number of the third mesh frame (116) is two, and the two third mesh frames (116) are axially arranged side by side, and the spacing between the two third mesh frames (116) is the same as the thickness of the gate (304).

3. The device for treating high-concentration organic wastewater according to claim 1, characterized in that: The gate (304) is integrally formed with a protrusion (305) at both ends, which is embedded in a groove (306) formed in the inner wall of the pool body (101), and a sealing layer (307) is arranged between the protrusion (305) and the groove (306) and fixedly connected to the pool body (101).

4. The device for treating high-concentration organic wastewater according to claim 1, characterized in that: The disturbance assembly comprises a punch (403) fixed opposite to the two sides of the pool body (101), and a screw pump (402) fixedly connected and communicated between the punch (403) and the buffer pool (308), and a third electric valve (401) is arranged between the screw pump (402) and the buffer pool (308).

5. The device for treating high-concentration organic wastewater according to claim 1, characterized in that: The transmission assembly comprises a first sprocket (412) and a second sprocket (414) which are respectively keyed connected to adjacent two rotating shafts (411), the first sprocket (412) and the second sprocket (414) are meshed with a chain (413), the first sprocket (412), the second sprocket (414) and the chain (413) are arranged in a sealing box (405) fixed to the bottom wall of the pool body (101), and the rotating shaft (411) is vertically arranged in the sealing box (405).

6. A process for treating high concentration organic wastewater, used in the high concentration organic wastewater treatment device according to any one of claims 1 to 5, characterized by: It comprises: S01, after the high-concentration organic wastewater is preliminarily filtered through the grid channel to remove large floating objects (such as branches, plastics and the like), the wastewater is delivered to the sand settling tank through the lifting pump, the sand particles in the wastewater are deposited by gravity settling, the sand particles deposited at the bottom of the sand settling tank are collected to the sand-water separator through the cyclone separator, the dry sand separated out is discharged by the screw conveyor, and the separated wastewater is input to the adjusting tank through the submersible pump; S02, the wastewater is maintained in water balance by the stirrer angle plate in the adjusting tank, the pH value of the wastewater is detected, the acid-base additive is added according to the acid-base property, the pH value of the wastewater is controlled to be between 6-9, and then the adjusted wastewater is delivered to the hydrolysis acidification tank through the lifting pump; S03, after the wastewater into the hydrolysis acidification tank, the large molecular organic matter which is difficult to biodegrade in it is decomposed into small molecular organic matter, and the ratio of biochemical oxygen demand to chemical oxygen demand of the wastewater is reduced, the ratio is increased to more than 0.4, the second electric valve (107) on the sewage inlet pipe (106) of the aeration tank (1) is opened, and the wastewater is transported into the tank body (101) by the submersible pump; S04, the aeration fan (2) is operated to sequentially fill oxygen into the tank body (101) through the aeration pipeline (111) and the aeration disc (112), the aerobic microbial population attached to the surface of the ceramsite (110) takes the organic matter in the wastewater as carbon source, and decomposes the organic matter in the wastewater into water and carbon dioxide through metabolic action, and converts ammonia nitrogen into nitrate nitrogen, the treated wastewater passes through the outlet grille (102) into the outlet tank (103), is pumped into the membrane reactor from the sewage outlet pipe (109), the second electric valve (107) on the backwashing inlet pipe (108) is opened, water is supplied to the backwashing inlet pipe (108) through an external water source, the water flow washes the excess biofilm and suspended sludge on the surface of the ceramsite (110), the first electric valve (105) on the backwashing outlet pipe (104) is opened, and the wastewater with excess biofilm and suspended sludge is output from the backwashing outlet pipe (104); S05, in a monthly cycle, the movable end of the electric push rod (302) is retracted, the gate (304) is moved upward, the wastewater is dispersed into the two buffer tanks (308), the motor (310) drives the lead screw (311) to rotate, the sliding block (313) drives the two first net frames (113) loaded with ceramsite (110) to move simultaneously through threaded transmission, the first net frame (113) in the buffer tank (308) moves to the top of the second net frame (115), the first net frame (113) on the top of the original second net frame (115) moves to the other buffer tank (308), then the movable end of the electric push rod (302) is extended to close the gate (304), and the air bubbles output by the aeration disc (112) contact the newly replaced ceramsite (110) in the first net frame (113) after the air bubbles are broken; S06, the biofilm protective agent is added into the buffer tank (308) to restore the activity of the aerobic microbial population in long-term decomposition, the third electric valve (401) is opened, the screw pump (402) pumps the wastewater containing the biofilm protective agent in the buffer tank (308) into the bottom of the tank body (101) to provide activity to the microbial film of the ceramsite (110) at the bottom of the tank body (101), the wastewater containing the biofilm protective agent is sprayed from the punch (403), the flow direction of the water is changed, the long plate (407) rotates with the water flow, and when the long plate (407) stably rotates after the long plate (407) rotates to a position where the folding plate (408) is perpendicular to the water flow sprayed from the punch (403), the bristles (409) brush the air outlet holes of the aeration disc (112) with the long plate (407), and the wastewater continues to pass through the three layers of ceramsite (110) to enter the outlet tank (103), flows out from the sewage outlet pipe (109), and is transported to the membrane reactor; S07, membrane reactor in the membrane throttle wastewater, activated sludge, macromolecular pollutants, membrane microbial degradation of organic matter and ammonia nitrogen, the purified water through the suction pump to the subsequent disinfection unit, discharge or reuse, activated sludge through the discharge pump, the remaining sludge through the plate and frame filter press dewatering after the export disposal.

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