Aquaculture wastewater purification device

Abstract

The invention discloses a purification device for aquaculture wastewater, and relates to the technical field of wastewater purification. Comprising a box body as well as a physical filter tank and a biochemical bacterium culture tank which are arranged in the box body, and further comprises a microfiltration assembly arranged in the physical filter tank, the microfiltration assembly comprises a filter cartridge rotationally connected to the interior of the physical filter tank, a backwashing pipe is fixedly connected to the interior of the physical filter tank, and a sewage collecting tank is arranged in the filter cartridge; a cleaning assembly matched with backwashing to improve the cleaning effect of the filter cartridge is arranged in the filter cartridge, the cleaning assembly comprises a floating plate arranged in the filter cartridge, a connecting rod slidably penetrates through the floating plate, and the upper end of the connecting rod penetrates through the dirt collecting tank and is fixedly connected with a first cleaning brush; stubborn attachments such as mycoderm and caustic soda attached to the inner wall of the filter cartridge can be brushed off by utilizing the first cleaning brush, and the cleaning effect on the filter cartridge can be improved by matching with backwashing, so that the attachments on the inner wall of the filter cartridge can be massively washed off, the backwashing period is shortened, and the blockage probability of the filter cartridge is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of wastewater purification, in particular to a device for purifying aquaculture wastewater. Background Art

[0002] In aquaculture, feed residues, fish and shrimp feces, etc. can cause pollution to the aquaculture water. The polluted aquaculture water will produce ammonia nitrogen, which is harmful to fish and shrimp. Therefore, it is necessary to purify the aquaculture wastewater. The purification treatment of aquaculture wastewater includes physical treatment and biochemical treatment. Physical treatment is to intercept the water-insoluble substances in the aquaculture water through microfiltration. Then, the water is cultured in a biochemical pool and nitrifying bacteria are used to decompose harmful substances such as ammonia nitrogen in the aquaculture water.

[0003] When the aquaculture wastewater is physically intercepted by the microfiltration machine, as the impurities attached to the surface of the filter of the microfiltration machine increase, the filter will be blocked. At this time, the aquaculture water inside the microfiltration machine cannot pass through the microfiltration machine and the water level will rise. When the water level rises to the set water level area, the sensor is triggered and the filter is flushed and cleaned through the backwash equipment;

[0004] However, due to the hard water quality in some areas, water scale will adhere to the mesh of the filter, and the bacterial film in the water will also adhere to the inside of the filter, which will cause the inner wall of the filter to not be thoroughly rinsed during backwashing. In the long run, the filter will be completely blocked, thereby reducing the filtering effect of the microfiltration machine. Summary of the Invention

[0005] The purpose of the present invention is to solve the problem of unclean backwashing caused by factors such as water alkali and biofilm adhesion in traditional wastewater treatment, and to propose a purification device for aquaculture wastewater.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A purification device for aquaculture wastewater, comprising a housing, a physical filtration tank and a biochemical culture tank arranged inside the housing, and a microfiltration component arranged inside the physical filtration tank;

[0008] The microfiltration assembly includes a filter cartridge rotatably connected to the interior of a physical filter tank, a backwash pipe is fixedly connected to the interior of the physical filter tank, and a sewage collecting tank is provided inside the filter cartridge;

[0009] The interior of the filter cartridge is provided with a cleaning component that cooperates with backwashing to improve the cleaning effect of the filter cartridge. The cleaning component includes a floating plate provided inside the filter cartridge, and a connecting rod is slidingly passed through the floating plate. The upper end of the connecting rod passes through the sewage collecting tank and is fixedly connected to a first cleaning brush, and the outside of the connecting rod is slidingly sleeved with a float. The outside of the connecting rod is fixedly connected to a first limit block, and the bottom end of the connecting rod is fixedly connected to a second limit block. A rubber ring is fixedly connected between the connecting rod and the sewage collecting tank.

[0010] As a further description of the above technical solution:

[0011] An anti-fallback assembly is provided inside the filter cartridge, and the anti-fallback assembly includes baffles fixedly connected to the inner wall of the filter cartridge in an annular array. The upper end of the floating plate is inclined, and the upper end of the floating plate is fixedly connected to a baffle.

[0012] As a further description of the above technical solution:

[0013] The connecting rod includes a first rod body and a second rod body, and a rotating shaft is rotatably connected between the first rod body and the second rod body through a hinge seat. The outer part of the rotating shaft is movably sleeved with a torsion spring fixedly connected to the hinge seat.

[0014] As a further description of the above technical solution:

[0015] An interception assembly is provided inside the filter cartridge, and the interception assembly includes a magnetic block fixedly connected to the bottom of the floating plate. The inner wall of the filter cartridge is fixedly connected to a fixed frame in an annular array. The interior of the fixed frame is rotatably connected to a winding shaft, and a coil spring is fixedly connected between one end of the winding shaft and the fixed frame. An interception net is wound on the surface of the winding shaft, and one end of the interception net is fixedly connected to an iron block.

[0016] As a further description of the above technical solution:

[0017] The magnetic block is located in front of the floating plate, and the magnetic attraction of the magnetic block to the iron block is greater than the sum of the gravity of the iron block and the elastic force of the coil spring, and the gravity of the iron block is less than the elastic force of the coil spring.

[0018] As a further description of the above technical solution:

[0019] A dredging assembly is provided on the outside of the float, and the dredging assembly includes guide blocks and a second cleaning brush which are fixedly connected to the upper and lower ends of the float in a ring-shaped array.

[0020] As a further description of the above technical solution:

[0021] The two sides of the box are fixedly connected with a water inlet pipe and a water outlet pipe respectively. The interior of the box is also provided with a water inlet pool and an equipment room. The water inlet pool, physical filtration pool, equipment room and biochemical culture pool are arranged in sequence from left to right and separated by partitions.

[0022] As a further description of the above technical solution:

[0023] A gear ring is fixedly connected to one end of the surface of the filter cartridge, and a gear meshing with the gear ring is rotatably connected to the side wall of one end of the physical filtration tank. A motor for driving the gear to rotate is fixedly connected inside the equipment room, and a blower is also fixedly connected to the equipment room. The air inlet of the blower passes through and extends to the outside of the equipment room, and the air outlet of the blower passes through the interior of the biochemical culture pool and is fixedly connected to an aeration pipe.

[0024] As a further description of the above technical solution:

[0025] A sterilizing lamp is provided inside the physical filtration pool, one end of the sewage collecting tank penetrates and extends to the inside of the water inlet pool, and one end of the sewage collecting tank is fixedly connected to a sewage discharge pipe.

[0026] As a further description of the above technical solution:

[0027] The upper and lower ends of the rubber ring are fixedly connected with sealing sleeves sleeved on the outside of the connecting rod, and the bottom rear end of the floating plate is fixedly connected with a counterweight block.

[0028] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0029] When the filter cartridge physically intercepts the wastewater, as the filter cartridge is clogged by impurities, the water level inside the filter cartridge rises. At this time, the float plate inside the filter cartridge rises synchronously with the water level. As the float plate rises, the float plate contacts the first limit block at the lower part of the connecting rod, and the first limit block drives the connecting rod to rise synchronously, thereby driving the first cleaning brush at the upper end of the connecting rod to rise and contact the inner wall of the filter cartridge. At this time, in conjunction with the rotation of the filter cartridge, the first cleaning brush can be used to brush off stubborn attachments such as bacterial film and water alkali attached to the inner wall of the filter cartridge. In conjunction with backwashing, the cleaning effect of the filter cartridge can be improved, so that a large amount of attachments on the inner wall of the filter cartridge can be washed off, reducing the backwash cycle and the chance of clogging of the filter cartridge. In addition, a rubber ring is provided at the connection between the connecting rod and the sump. The elastic deformation characteristics of the rubber ring are utilized, and the water surface swing caused by the water inlet fluctuation and the agitation when the filter cartridge rotates is combined. The water surface swing drives the float plate to slide synchronously, and then drives the connecting rod to squeeze the rubber ring and swing. The swing of the connecting rod is used to increase the cleaning range of the first cleaning brush, further improving the cleaning effect of the inner wall of the filter cartridge. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It shows a schematic diagram of the overall structure provided by an embodiment of the present invention;

[0031] Figure 2 A schematic cross-sectional view of an embodiment of the present invention is shown;

[0032] Figure 3A schematic diagram of a partial structure of a microfiltration assembly provided in an embodiment of the present invention is shown;

[0033] Figure 4 A schematic diagram of a partial structure of a cleaning component provided according to an embodiment of the present invention is shown;

[0034] Figure 5 Showing a view of the combination of a first cleaning brush and a connecting rod provided in an embodiment of the present invention;

[0035] Figure 6 A schematic diagram of a disassembled structure of a connecting rod according to an embodiment of the present invention is shown;

[0036] Figure 7 It shows a schematic structural diagram of a dredging assembly according to an embodiment of the present invention;

[0037] Figure 8 A schematic diagram of the local structure of an interception component provided according to an embodiment of the present invention is shown.

[0038] Legend:

[0039] 10. Tank; 11. Physical filtration tank; 12. Biochemical culture tank; 13. Water inlet pipe; 14. Water outlet pipe; 15. Water inlet tank; 16. Equipment room; 17. Partition; 18. Blower; 19. Aeration pipe;

[0040] 20. Microfiltration assembly; 21. Filter cartridge; 22. Gear ring; 23. Gear; 24. Motor; 25. Backwash pipe; 26. Sewage collecting tank; 27. Sewage drain pipe; 28. Germicidal lamp;

[0041] 30. Cleaning assembly; 31. Floating plate; 32. Connecting rod; 321. First rod; 322. Second rod; 323. Articulated seat; 324. Rotating shaft; 325. Torsion spring; 33. First cleaning brush; 34. Floating ball; 35. First stopper; 36. Rubber ring; 37. Sealing sleeve; 38. Second stopper;

[0042] 40. Anti-fallback assembly; 41. Enclosure; 42. Baffle;

[0043] 50. Interception assembly; 51. Magnetic block; 52. Fixed frame; 53. Winding reel; 54. Coil spring; 55. Interception net; 56. Iron block; 57. Counterweight;

[0044] 60. Unclogging assembly; 61. Guide block; 62. Second cleaning brush. DETAILED DESCRIPTION

[0045] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0046] like Figure 1-Figure 7 As shown, the aquaculture wastewater purification device provided by the present invention includes a housing 10 and a physical filtration tank 11, a biochemical culture tank 12, an inlet tank 15, and an equipment room 16 disposed inside the housing 10. The inlet tank 15, the physical filtration tank 11, the equipment room 16, and the biochemical culture tank 12 are arranged in sequence from left to right and separated by a partition 17. A water inlet pipe 13 and a water outlet pipe 14 are fixedly connected to both sides of the housing 10, respectively. The housing also includes a microfiltration component 20 disposed inside the physical filtration tank 11.

[0047] The microfiltration assembly 20 includes a filter cartridge 21 rotatably connected to the interior of the physical filter tank 11, a backwash pipe 25 is fixedly connected to the interior of the physical filter tank 11, a sewage collecting tank 26 is provided inside the filter cartridge 21, a gear ring 22 is fixedly connected to one end of the surface of the filter cartridge 21, a gear 23 meshing with the gear ring 22 is rotatably connected to the side wall of one end of the physical filter tank 11, a motor 24 for driving the gear 23 to rotate is fixedly connected to the interior of the equipment room 16, and a blower 18 is also fixedly connected to the equipment room 16, an air inlet of the blower 18 passes through and extends to the outside of the equipment room 16, and an air outlet of the blower 18 passes through the interior of the biochemical culture tank 12 and is fixedly connected to an aeration pipe 19, a germicidal lamp 28 is provided inside the physical filter tank 11, one end of the sewage collecting tank 26 passes through and extends to the interior of the water inlet tank 15, and one end of the sewage collecting tank 26 is fixedly connected to a sewage pipe 27;

[0048] The interior of the filter cartridge 21 is provided with a cleaning assembly 30 that cooperates with backwashing to improve the cleaning effect of the filter cartridge 21. The cleaning assembly 30 includes a floating plate 31 provided inside the filter cartridge 21, and a connecting rod 32 is slidably penetrated on the floating plate 31. The upper end of the connecting rod 32 penetrates the sewage collecting tank 26 and is fixedly connected to the first cleaning brush 33, and the outside of the connecting rod 32 is slidably sleeved with a float 34, the outside of the connecting rod 32 is fixedly connected to a first limit block 35, and the bottom end of the connecting rod 32 is fixedly connected to a second limit block 38, a rubber ring 36 is fixedly connected between the connecting rod 32 and the sewage collecting tank 26, and the upper and lower ends of the rubber ring 36 are fixedly connected to a sealing sleeve 37 sleeved on the outside of the connecting rod 32.

[0049] Specifically, the aquaculture wastewater to be treated is first introduced into the interior of the water inlet pool 15 through the water inlet pipe 13, and then the water level inside the water inlet pool 15 rises and enters the interior of the filter cartridge 21. At this time, the motor 24 drives the gear 23 to rotate, and the gear 23 drives the filter cartridge 21 to rotate synchronously through the gear ring 22. The filter cartridge 21 is used to physically intercept the aquaculture wastewater entering its interior, and impurities such as feed residues and fish feces in the wastewater are filtered out. Then, the germicidal lamp 28 is used to irradiate and disinfect bacteria in the water. When the wastewater is physically intercepted by the filter cartridge 21, as the impurities intercepted by the inner wall of the filter cartridge 21 increase, the inner wall of the filter cartridge 21 will be covered by impurities and become clogged. At this time, the filter effect of the filter cartridge 21 on the wastewater is reduced, and the water level inside the filter cartridge 21 increases. When the water level reaches the specified position, the liquid level gauge is triggered. At this time, the backwash system works, and the wastewater that has been filtered in the physical filtration pool 11 is pumped into the backwash pipe through the water pump. 25 and discharged, thereby backwashing the filter cartridge 21 from the top of the filter cartridge 21, and using backwashing to flush out impurities attached to the inner wall of the filter cartridge 21, so that the filter cartridge 21 is restored to normal and continues to physically filter the incoming wastewater, and the impurities flushed down fall into the sump 26 and are discharged through the drain pipe 27 under the impact of the water flow. After that, the wastewater that has been physically filtered in the physical filter pool 11 enters the biochemical culture pool 12 through the pipeline, and the wastewater is biochemically cultured through the culture filter material, and the cultivated nitrifying bacteria decomposes harmful substances such as ammonia nitrogen in the wastewater. At the same time, the outside air is introduced into the biochemical culture pool 12 through the aeration pipe 19 through the blower 18, providing sufficient oxygen for the nitrifying bacteria, thereby accelerating the growth of nitrifying bacteria and the decomposition of harmful substances such as ammonia nitrogen. Finally, the wastewater treated by the physical filter pool 11 and the biochemical culture pool 12 is discharged from the outlet pipe 14 to the culture pool for recycling;

[0050] When the filter cartridge 21 physically intercepts the wastewater, as the filter cartridge 21 is clogged by impurities, the water level inside the filter cartridge 21 rises. At this time, the float plate 31 inside the filter cartridge 21 rises synchronously with the water level. As the float plate 31 rises, the float plate 31 contacts the first limit block 35 at the lower part of the connecting rod 32, and the first limit block 35 drives the connecting rod 32 to rise synchronously, thereby driving the first cleaning brush 33 at the upper end of the connecting rod 32 to rise and contact the inner wall of the filter cartridge 21. At this time, in conjunction with the rotation of the filter cartridge 21, the first cleaning brush 33 can be used to brush off stubborn attachments such as bacterial film and water alkali attached to the inner wall of the filter cartridge 21, and in conjunction with backwashing, it can improve the The cleaning effect of the filter cartridge 21 allows a large amount of attachments on the inner wall of the filter cartridge 21 to be washed away, reducing the backwash cycle and the probability of clogging of the filter cartridge 21. A rubber ring 36 is provided at the connection between the connecting rod 32 and the sewage collection tank 26. The elastic deformation characteristics of the rubber ring 36 are utilized to cooperate with the water surface swing generated by the water inlet fluctuation and the agitation when the filter cartridge 21 rotates. The water surface swing drives the floating plate 31 to slide synchronously, and then drives the connecting rod 32 to squeeze the rubber ring 36 and swing. The swing of the connecting rod 32 increases the cleaning range of the first cleaning brush 33, further improving the cleaning effect of the inner wall of the filter cartridge 21.

[0051] The first cleaning brush 33 is moved downwards to clean the filter cartridge 21 after the filter cartridge 21 is cleaned, and the water level inside the filter cartridge 21 drops, and the float 31 also drops accordingly. At this time, the float 34 arranged inside the sump 26 uses the first limit block 35 at the upper end of the connecting rod 32 to lift the connecting rod 32 due to the accumulated water gathered inside the sump 26 due to backwashing, and continues to provide buoyancy for the connecting rod 32 and the first cleaning brush 33, ensuring that the first cleaning brush 33 can continue to clean the filter cartridge 21 during the backwashing process, while the float 31 slides downwards relative to the connecting rod 32 between the first limit block 35 and the second limit block 38 at the lower end. Therefore, the float 31 will not affect the work of the first cleaning brush 33 when following the drop in water level, until the backwashing operation is completed, the sewage inside the sump 26 is emptied, and the float 31 and the float 34 lose their buoyancy, and then the connecting rod 32 drives the first cleaning brush 33 to move downwards and reset synchronously.

[0052] like Figure 3-Figure 6 As shown, an anti-fallback assembly 40 is provided inside the filter cartridge 21. The anti-fallback assembly 40 includes baffles 42 fixedly connected to the inner wall of the filter cartridge 21 in an annular array. The upper end of the floating plate 31 is inclined, and the upper end of the floating plate 31 is fixedly connected to the enclosure 41.

[0053] The connecting rod 32 includes a first rod body 321 and a second rod body 322 , and a rotating shaft 324 is rotatably connected between the first rod body 321 and the second rod body 322 via a hinge seat 323 . A torsion spring 325 fixedly connected to the hinge seat 323 is movably sleeved on the outer portion of the rotating shaft 324 .

[0054] Specifically, as the filter cartridge 21 continues to filter, the impurities attached to its inner wall also increase, and the rotation of the filter cartridge 21 will also drive the impurities back into the sewage, which causes the intercepted impurities to easily fall into the water when being rotated to leave the water surface, so that some impurities need to be filtered repeatedly, increasing the filtration burden and reducing the filtration effect. Therefore, an inclined baffle 42 is set on the inner wall of the filter cartridge 21. When the filter cartridge 21 rotates to drive the impurities to leave the water surface, the baffle 42 is used to preliminarily intercept the sliding impurities until the filter cartridge 21 drives the impurities to rotate to the top. At this time, the inclined surface of the baffle 42 is used to guide the fallen impurities to fall into the interior of the sewage collection tank 26, while some impurities that have not fallen into the sewage collection tank 26 fall on the float 31. Therefore, the upper end of the float 31 is set to be inclined. When the filter cartridge 21 rotates, it will drive the baffle 42 to rotate and The rear part of the plate 31 causes interference, so that the float plate 31 is intermittently pushed upward by the rotating shaft 324 between the second rod body 322 and the first rod body 321, while the front part of the float plate 31 is immersed in the wastewater by rotating downward until the baffle 42 passes over the float plate 31, and the float plate 31 is driven to return to its original position under the action of the torsion spring 325. At this time, the part of the float plate 31 immersed in the water scoops up part of the wastewater under the action of the baffle 41, and after the float plate 31 is restored, the wastewater uses the inclined surface of the upper end of the float plate 31 to flush the dripping impurities back to the inner wall of the filter cartridge 21, preventing the impurities that have been filtered from falling into the wastewater again, reducing the pulverization of fish feces, food residues, etc. into fine particles due to repeated falling of impurities into the water, making it impossible for the filter cartridge 21 to intercept them. On the one hand, it reduces the filtration burden of the filter cartridge 21, and on the other hand, it ensures the filtration effect of the filter cartridge 21.

[0055] like Figure 3 、 Figure 4 and Figure 8 As shown, an interception assembly 50 is provided inside the filter cartridge 21. The interception assembly 50 includes a magnetic block 51 fixedly connected to the bottom of the floating plate 31. A fixing frame 52 is fixedly connected to the inner wall of the filter cartridge 21 in an annular array. A winding shaft 53 is rotatably connected to the interior of the fixing frame 52. A coil spring 54 is fixedly connected between one end of the winding shaft 53 and the fixing frame 52. An interception net 55 is wound around the surface of the winding shaft 53, and an iron block 56 is fixedly connected to one end of the interception net 55.

[0056] The magnetic block 51 is located in front of the floating plate 31, and the magnetic attraction of the magnetic block 51 to the iron block 56 is greater than the sum of the gravity of the iron block 56 and the elastic force of the disc spring 54. The gravity of the iron block 56 is less than the elastic force of the disc spring 54. A counterweight block 57 is fixedly connected to the bottom rear end of the floating plate 31.

[0057] Specifically, since some impurities will be suspended in the wastewater, some impurities cannot be intercepted by the filter cartridge 21 when the filter cartridge 21 rotates. Therefore, an interception component 50 is set inside the filter cartridge 21. When the filter cartridge 21 drives the interception component 50 to rotate from the front of the floating plate 31 to its bottom, the iron block 56 will be adsorbed by the magnetic block 51 under the magnetic force of the magnetic block 51, so that during the rotation of the filter cartridge 21, the position of the iron block 56 remains unchanged, while the position of the fixed frame 52 keeps changing. Therefore, the interception net 55 originally wound on the surface of the winding shaft 53 will be stretched and expanded, and the interception net 55 can be used to filter the wastewater. The suspended impurities in the filter are intercepted until the interception component 50 follows the filter cartridge 21 to rotate to the rear of the float 31. At this time, the filter cartridge 21 pulls the lower iron block 56 to separate from the magnetic block 51, and the interception net 55 is rewound back onto the winding reel 53 through the elastic force of the coil spring 54. Until the interception component 50 follows the filter cartridge 21 to the bottom of the backwash pipe 25, the interception net 55 is stretched and unfolded again under the impact of the backwash water flow and the gravity of the iron block 56. The impurities attached to the surface of the interception net 55 are washed into the sump 26 through backwashing, thereby improving the effect of physical filtration of wastewater.

[0058] like Figure 7 As shown, a dredging assembly 60 is provided on the outside of the float 34 , and the dredging assembly 60 includes a guide block 61 and a second cleaning brush 62 which are fixedly connected to the upper and lower ends of the float 34 in a ring-shaped array.

[0059] Specifically, when the backwash operation flushes the iron block 56 and pulls the interception net 55 to unfold, the iron block 56 will move toward the inside of the sewage trough 26 until the iron block 56 contacts the guide block 61 on the float 34 and applies force to the guide block 61, thereby using the guide block 61 to push the float 34 to move down and rotate. When the float 34 moves down and rotates, it drives the second cleaning brush 62 at its bottom to stir the impurities collected inside the sewage trough 26, so that the deposited impurities are suspended and discharged from the sewage pipe 27 with the impact of the water flow, reducing the probability of blockage inside the sewage trough 26 due to impurity precipitation, thereby preventing the overflow of wastewater inside the sewage trough 26 from carrying impurities back into the filter cartridge 21, and further ensuring the filtering effect of the filter cartridge 21.

[0060] Working principle: First, the aquaculture wastewater to be treated is introduced into the water inlet pool 15 through the water inlet pipe 13, and then the water level inside the water inlet pool 15 rises and enters the filter cartridge 21. At this time, the motor 24 drives the gear 23 to rotate, and the gear 23 drives the filter cartridge 21 to rotate synchronously through the gear ring 22. The filter cartridge 21 is used to physically intercept the aquaculture wastewater entering it, and filter out impurities such as feed residues and fish feces in the wastewater. Then, the germicidal lamp 28 is used to irradiate and disinfect bacteria in the water. When the wastewater is physically intercepted by the filter cartridge 21, as the impurities intercepted by the inner wall of the filter cartridge 21 increase, the inner wall of the filter cartridge 21 will be affected. The filter cartridge 21 is covered by impurities and becomes clogged. At this time, the filter effect of the filter cartridge 21 on the wastewater is reduced, and the water level inside the filter cartridge 21 increases. When the water level reaches the specified position, the liquid level gauge is triggered. At this time, the backwash system works, and the wastewater that has been filtered in the physical filter tank 11 is pumped into the backwash pipe 25 through the water pump and discharged, thereby backwashing the filter cartridge 21 from the top of the filter cartridge 21. The impurities attached to the inner wall of the filter cartridge 21 are washed away by backwashing, so that the filter cartridge 21 is restored to be unobstructed and continues to physically filter the incoming wastewater, while the washed away impurities fall into the sump 26 and are discharged through the drain pipe 27 under the impact of the water flow. When the cartridge 21 physically intercepts the wastewater, as the filter cartridge 21 is clogged by impurities, the water level inside the filter cartridge 21 rises. At this time, the float plate 31 inside the filter cartridge 21 rises synchronously with the water level. As the float plate 31 rises, the float plate 31 contacts the first limit block 35 at the lower part of the connecting rod 32, and the first limit block 35 drives the connecting rod 32 to rise synchronously, thereby driving the first cleaning brush 33 at the upper end of the connecting rod 32 to rise and contact the inner wall of the filter cartridge 21. At this time, in conjunction with the rotation of the filter cartridge 21, the first cleaning brush 33 can be used to brush off stubborn attachments such as bacterial film and water alkali attached to the inner wall of the filter cartridge 21, and in conjunction with backwashing, the filter cleaning can be improved. The cleaning effect of the cartridge 21 enables a large amount of attachments on the inner wall of the filter cartridge 21 to be washed off, thereby reducing the backwash cycle and the probability of clogging of the filter cartridge 21. In addition, a rubber ring 36 is provided at the connection between the connecting rod 32 and the sump 26. The elastic deformation characteristics of the rubber ring 36 are utilized to cooperate with the water surface swing generated by the water inlet fluctuation and the agitation when the filter cartridge 21 rotates. The water surface swing drives the floating plate 31 to slide synchronously, and then drives the connecting rod 32 to squeeze the rubber ring 36 to swing. The swing of the connecting rod 32 increases the cleaning range of the first cleaning brush 33, further improving the cleaning effect of the inner wall of the filter cartridge 21.

[0061] The first cleaning brush 33 is then lifted up by the first stop block 35 on the upper end of the connecting rod 32 to provide buoyancy for the connecting rod 32 and the first cleaning brush 33, thereby ensuring that the first cleaning brush 33 can continue to clean the filter cartridge 21 during the backwashing process. The floating plate 31 slides downward relative to the connecting rod 32 between the first stop block 35 and the second stop block 38 on the lower end. Therefore, the floating plate 31 will not affect the work of the first cleaning brush 33 when following the water level drop. Until the backwashing operation is completed, the collecting ball 34 will be lifted up by the first stop block 35 on the upper end of the connecting rod 32 to provide buoyancy for the connecting rod 32 and the first cleaning brush 33. After the sewage in the trough 26 is drained and the float plate 31 and the float ball 34 lose their buoyancy, the connecting rod 32 drives the first cleaning brush 33 to move downward and reset synchronously. Then, the wastewater that has been physically filtered by the physical filter tank 11 enters the biochemical culture tank 12 through the pipe, and the wastewater is biochemically cultured through the culture filter material, and the cultivated nitrifying bacteria decompose harmful substances such as ammonia nitrogen in the wastewater. At the same time, the outside air is introduced into the biochemical culture tank 12 through the aeration pipe 19 by the blower 18, providing sufficient oxygen for the nitrifying bacteria, thereby accelerating the growth of nitrifying bacteria and the decomposition of harmful substances such as ammonia nitrogen. Finally, the wastewater treated by the physical filter tank 11 and the biochemical culture tank 12 is discharged from the outlet pipe 14 to the culture tank for recycling.

[0062] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A purification device for aquaculture wastewater, comprising a housing (10) and a physical filtration pool (11) and a biochemical culture pool (12) arranged inside the housing (10), characterized in that: It also includes a microfiltration component (20) disposed inside the physical filtration tank (11); The microfiltration assembly (20) includes a filter cartridge (21) rotatably connected to the interior of a physical filter pool (11), a backwash pipe (25) is fixedly connected to the interior of the physical filter pool (11), and a sewage collecting tank (26) is provided inside the filter cartridge (21); The interior of the filter cartridge (21) is provided with a cleaning assembly (30) that cooperates with backwashing to improve the cleaning effect of the filter cartridge (21), and the cleaning assembly (30) includes a floating plate (31) provided inside the filter cartridge (21), and a connecting rod (32) is slidably passed through the floating plate (31), the upper end of the connecting rod (32) passes through the sewage collecting tank (26) and is fixedly connected to a first cleaning brush (33), and the outside of the connecting rod (32) is slidably sleeved with a floating ball (34), the outside of the connecting rod (32) is fixedly connected to a first limit block (35), and the bottom end of the connecting rod (32) is fixedly connected to a second limit block (38), and a rubber ring (36) is fixedly connected between the connecting rod (32) and the sewage collecting tank (26).

2. The aquaculture wastewater purification device according to claim 1, characterized in that: An anti-fallback assembly (40) is provided inside the filter cartridge (21), and the anti-fallback assembly (40) includes baffles (42) fixedly connected to the inner wall of the filter cartridge (21) in an annular array. The upper end of the floating plate (31) is inclined, and the upper end of the floating plate (31) is fixedly connected to a baffle (41).

3. The aquaculture wastewater purification device according to claim 1, characterized in that: The connecting rod (32) includes a first rod body (321) and a second rod body (322), and a rotating shaft (324) is rotatably connected between the first rod body (321) and the second rod body (322) via a hinge seat (323), and the outer movably sleeve of the rotating shaft (324) is provided with a torsion spring (325) fixedly connected to the hinge seat (323).

4. The aquaculture wastewater purification device according to claim 1, characterized in that: An interception assembly (50) is provided inside the filter cartridge (21), and the interception assembly (50) includes a magnetic block (51) fixedly connected to the bottom of the floating plate (31). The inner wall of the filter cartridge (21) is fixedly connected to a fixed frame (52) in an annular array. A winding shaft (53) is rotatably connected inside the fixed frame (52), and a coil spring (54) is fixedly connected between one end of the winding shaft (53) and the fixed frame (52). An interception net (55) is wound around the surface of the winding shaft (53), and an iron block (56) is fixedly connected to one end of the interception net (55).

5. The aquaculture wastewater purification device according to claim 4, characterized in that: The magnetic block (51) is located in front of the floating plate (31), and the magnetic attraction of the magnetic block (51) to the iron block (56) is greater than the sum of the gravity of the iron block (56) and the elastic force of the coil spring (54), and the gravity of the iron block (56) is less than the elastic force of the coil spring (54).

6. The aquaculture wastewater purification device according to claim 1, characterized in that: A dredging assembly (60) is provided outside the float (34), and the dredging assembly (60) comprises guide blocks (61) and a second cleaning brush (62) fixedly connected to the upper and lower ends of the float (34) in a ring-shaped array.

7. The aquaculture wastewater purification device according to claim 1, characterized in that: A water inlet pipe (13) and a water outlet pipe (14) are fixedly connected to both sides of the box (10), and a water inlet pool (15) and an equipment room (16) are further provided inside the box (10). The water inlet pool (15), the physical filtration pool (11), the equipment room (16) and the biochemical culture pool (12) are arranged in sequence from left to right and separated by a partition (17).

8. The aquaculture wastewater purification device according to claim 7, characterized in that: A gear ring (22) is fixedly connected to one end of the surface of the filter cartridge (21); a gear (23) meshing with the gear ring (22) is rotatably connected to a side wall of one end of the physical filtration pool (11); a motor (24) for driving the gear (23) to rotate is fixedly connected to the interior of the equipment room (16); and a blower (18) is also fixedly connected to the equipment room (16); an air inlet of the blower (18) passes through and extends to the outside of the equipment room (16), and an air outlet of the blower (18) passes through the interior of the biochemical culture pool (12) and is fixedly connected to an aeration pipe (19).

9. The aquaculture wastewater purification device according to claim 8, characterized in that: A sterilizing lamp (28) is provided inside the physical filtration tank (11), one end of the sewage collecting tank (26) penetrates and extends into the interior of the water inlet tank (15), and one end of the sewage collecting tank (26) is fixedly connected to a sewage discharge pipe (27).

10. The aquaculture wastewater purification device according to claim 1, characterized in that: The upper and lower ends of the rubber ring (36) are fixedly connected to a sealing sleeve (37) sleeved on the outside of the connecting rod (32), and the bottom rear end of the floating plate (31) is fixedly connected to a counterweight block (57).

Images