Alternate aeration biological filter

Abstract

The utility model provides an alternate aeration biological filter, and belongs to the technical field of sewage treatment. The device comprises an alternate aeration unit, the alternate aeration unit comprises two biological tank bodies connected in series, filler units are arranged in the biological tank bodies, aeration assemblies are arranged between the filler units and the tank bottoms of the biological tank bodies, the aeration assemblies in the two biological tank bodies connected in series operate alternately, backwashing assemblies are further arranged in the filler units, and sewage discharge tanks are arranged at the tank bottoms of the biological tank bodies. A sewage discharging assembly is further arranged at the bottom of the biological tank body, the first-stage biological tank body is connected with the mixed reaction tank through a first water inlet pipe, and a water inlet is formed in one side of the mixed reaction tank. The two biological tank bodies connected in series in the aeration unit can alternately change between aerobiotic and anaerobic, so that the sewage treatment capacity of the aeration tank can be improved under the condition of not increasing energy consumption; sludge at the bottom of the biological tank body can be discharged into the sewage discharge tank in time, so that sludge deposition is avoided; and when the biological tank body is in an aerobic state, the content of dissolved oxygen in sewage is higher.

Description

Technical Field

[0001] The utility model belongs to the technical field of sewage treatment and relates to an alternative aeration biological filter tank. Background Art

[0002] The aeration biological filter tank is a new type of biological membrane sewage treatment process developed in Europe and America at the end of the 1980s and has been greatly developed in the early 1990s. Due to the usually large tank volume and low aeration intensity of traditional aeration tanks, continuous aeration methods need to be adopted, and the operation time of aeration equipment is relatively long. Therefore, the energy consumption is relatively high. Traditional aeration tanks operate either under anaerobic environmental conditions or under aerobic environmental conditions, and the treatment efficiency of aeration tanks is low. In addition, sludge is easily deposited at the bottom of the aeration tank. If not treated in time, it is easy to deteriorate the water quality, reduce the treatment efficiency of the aeration tank, and increase the energy consumption and maintenance cost. Content of the Utility Model

[0003] The purpose of the utility model is to provide an alternative aeration biological filter tank for the above problems.

[0004] To achieve the above purpose, the utility model adopts the following technical solutions:

[0005] An alternative aeration biological filter tank includes an alternative aeration unit. The alternative aeration unit includes two serially connected biological tank bodies. A packing unit is arranged in the biological tank body. An aeration component is arranged between the packing unit and the bottom of the biological tank body. The aeration components in the two serially connected biological tank bodies operate alternately. A backwashing component is also arranged in the packing unit. A sewage discharge tank is arranged at the bottom of the biological tank body. A sewage discharge component is also arranged on the bottom of the biological tank body. The first biological tank body at the head is connected to a mixing reaction tank through a first water inlet pipe. An inlet is arranged on one side of the mixing reaction tank.

[0006] The aeration components in the two serially connected biological tank bodies operate alternately in different time periods, so that the two serially connected biological tank bodies can alternate between aerobic and anaerobic states. The backwashing component can wash away the excessive biological film and suspended solid substances accumulated on the packing unit to prevent blockage and ensure good filtration performance. The sewage discharge component can discharge the sludge deposited at the bottom of the biological tank body into the sewage discharge tank to prevent the sludge from depositing at the bottom of the biological tank body and affecting the sewage treatment quality.

[0007] In the above alternative aeration biological filter tank, the first water inlet pipe is arranged at the lower side of the first biological tank body at the head. A first water outlet pipe communicating with the second biological tank body is arranged at the upper side of the other side of the first biological tank body at the head. A second water outlet pipe is arranged at the lower side of the second biological tank body far from the first water outlet pipe. The packing units in the two biological tank bodies are respectively located between the first water inlet pipe and the first water outlet pipe and between the first water outlet pipe and the second water outlet pipe.

[0008] The sewage entering the primary biological pool body flows from bottom to top and comes into full contact with the packing unit. The first outlet pipe is arranged at the upper end of the biological pool body to ensure that the sewage flows into the secondary biological pool body after fully contacting the packing unit in the primary biological pool body. The sewage in the secondary biological pool body flows from top to bottom and comes into full contact with the packing unit, which can significantly improve the treatment efficiency and effect of the sewage.

[0009] In the above-mentioned alternative aeration biological filter, an aeration area is formed between the packing unit and the bottom of the biological pool body. The aeration assembly includes an aeration delivery pipe horizontally arranged in the aeration area through a peripheral fixed bracket arranged on the inner side wall of the biological pool body and distributed circumferentially along the inner side wall. A number of air holes are evenly distributed along the length direction of the top of the aeration delivery pipe. The air inlet end of the aeration delivery pipe is connected to an external aeration blower, and a bubble diffusion structure is also provided on the air holes.

[0010] When the aeration blower operates, air is delivered into the aeration delivery pipe, and the air will diffuse out of the air holes in the form of bubbles and enter the sewage. During the rising process of the bubbles, oxygen will be continuously released and dissolved into the sewage to make the biological pool body in an aerobic state. The bubble diffusion structure on the air holes can divide the large bubbles into smaller bubbles, thereby increasing the contact area between the bubbles and water. These small bubbles have a longer residence time in the sewage and can transfer oxygen to the water more effectively.

[0011] In the above-mentioned alternative aeration biological filter, the bubble diffusion structure includes a hollow disc body. The bottom end of the disc body is provided with an air inlet pipe hermetically connected to the air hole. The disc body includes a lower disc body. A positioning step is arranged in the lower disc body, and a rubber diaphragm is arranged on the positioning step. A number of aeration micropores are evenly distributed on the rubber diaphragm. An annular gland is arranged at the upper end of the rubber diaphragm and is detachably and fixedly connected to the lower disc body.

[0012] Air enters the disc body from the air hole and diffuses out of the micropores of the rubber diaphragm in the form of microbubbles and enters the sewage. The contact area between the microbubbles and water is larger, and the residence time in the sewage is longer, improving the oxygen mass transfer efficiency. The rubber diaphragm is detachably arranged on the positioning step of the lower disc body, with convenient disassembly and assembly and easy replacement and maintenance.

[0013] In the above-mentioned alternative aeration biological filter, the sewage discharge assembly includes a sewage discharge plate horizontally and slidably connected to the bottom of the biological pool body. A sewage scraping plate is arranged on the sewage discharge plate near the sewage discharge pool side. An external sewage discharge driver is arranged outside the biological pool body. The output end of the sewage discharge driver is connected with a driving rod passing through the outer wall of the biological pool body and connected to the sewage discharge plate. An active sealing structure is arranged between the driving rod and the outer wall of the biological pool body.

[0014] The sewage drive is running, and the output end of the sewage drive extends out to drive the sewage plate to move inward at the bottom of the biological pool through the driving rod. During the movement of the sewage plate, the sludge accumulated at the bottom of the biological pool is pushed and pushed into the sewage pool to prevent the sludge from accumulating at the bottom of the biological pool and affecting the quality of sewage treatment. The sewage scraper on the side wall of the sewage plate can efficiently push the accumulated sludge and improve the silt discharge efficiency. The movable sealing structure between the driving rod and the outer wall of the biological pool plays a role of sealing and leak prevention during the extension and retraction of the driving rod.

[0015] In the above-mentioned alternating aeration biological filter, the movable sealing structure includes a sealing groove penetrating through the outer wall of the biological pool body, the driving rod is passed through the sealing groove and a movable sealing ring is provided between the sealing groove, and a water leakage box is also provided outside the biological pool body, and a leak-proof interface covering the sealing groove is provided on the side wall of the water leakage box, and the driving rod is passed through the water leakage box and the leak-proof interface.

[0016] The movable sealing ring between the driving rod and the sealing groove plays a role of movable sealing during the extension and retraction of the driving rod, thereby preventing sewage from flowing out of the sealing groove. If there is still sewage leaking from the sealing groove, it can flow into the leakage tank through the leak-proof interface, thereby effectively preventing sewage leakage.

[0017] In the above-mentioned alternating aerated biological filter, the cross-section of the sewage scraper is triangular, the angle between the sewage scraper near the sewage tank and the bottom of the biological tank body is an acute angle, and the bottom of the biological tank body is horizontally arranged or inclined toward the sewage tank.

[0018] The sewage scraper on the side wall of the sewage plate is set at an angle, which can scrape the accumulated sludge, shovel the accumulated sludge, and effectively push the accumulated sludge to improve the silt discharge efficiency.

[0019] In the above-mentioned alternating aerated biological filter, the packing unit includes a plurality of packing layers arranged from top to bottom in the biological tank body, and the backwash assembly includes a plurality of backwash water pipes and backwash aeration pipes staggered between the packing layers. The backwash water pipes and backwash aeration pipes are respectively evenly distributed with a plurality of backwash water holes and backwash air holes, and the water inlet end of the backwash water pipe and the air inlet end of the backwash aeration pipe are respectively connected to an external water pump and a backwash blower.

[0020] The external water pump runs to convey water to the backwash water pipe, and the water is ejected from the backwash water holes on the backwash water pipe to backwash the filler layer. The external backwash blower runs to convey air to the backwash aeration pipe, and the air is ejected from the backwash air holes on the backwash aeration pipe to backwash the filler layer, which can flush away the excess biofilm and suspended solids accumulated on the filler layer, prevent clogging and ensure good filtration performance.

[0021] In the above-mentioned alternative aeration biological filter, one side of the upper end of the primary biological tank body is provided with a first backwash return pipe communicating with the mixing reaction tank. A second backwash return pipe is also provided between the upper ends of the two series-connected biological tank bodies. Closing valves are respectively arranged in the first backwash return pipe and the second backwash return pipe. A fine filter screen is arranged in the biological tank body between the second backwash return pipe and the first water outlet pipe.

[0022] The biological film and solid suspended matters washed down from the packing layer in the secondary biological tank body can flow back into the primary biological tank body through the second backwash return pipe, and together with the biological film and solid suspended matters washed down from the packing layer in the primary biological tank body, flow back into the mixing reaction tank through the first backwash return pipe for re-mixing.

[0023] In the above-mentioned alternative aeration biological filter, a mixing driver is arranged at the top of the mixing reaction tank. The output end of the mixing driver is connected to a rotating shaft passing through the top of the mixing reaction tank and extending into the interior of the mixing reaction tank. Mixing paddles are arranged on the rotating shaft. A powder inlet is also arranged at the top of the mixing reaction tank.

[0024] When the mixing driver operates, the output end of the mixing driver rotates to drive the rotating shaft to rotate. The mixing paddles on the rotating shaft rotate to stir and mix the sewage and the medicament, removing harmful substances in the sewage.

[0025] Compared with the existing technology, the advantages of the present utility model are as follows: 1. The two series-connected biological tank bodies in the aeration unit can alternately change between aerobic and anaerobic states, which can improve the sewage treatment capacity of the aeration tank without increasing energy consumption. 2. The sludge at the bottom of the biological tank body can be timely discharged into the sewage discharge tank to avoid sludge accumulation. 3. When the biological tank body is in the aerobic state, the dissolved oxygen content in the sewage is higher. Description of the Drawings

[0026] Figure 1 is the overall structural schematic diagram provided by the present utility model;

[0027] Figure 2 is the structural schematic diagram of the primary biological tank body in the alternative aeration unit;

[0028] Figure 3 is the structural schematic diagram of the aeration assembly.

[0029] In the figure, there are an alternating aeration unit 1, a biological tank body 2, a packing unit 3, an aeration assembly 4, a backwashing assembly 5, a sewage draining tank 6, a sewage draining assembly 7, a first water inlet pipe 8, a mixing reaction tank 9, a water inlet 10, a first water outlet pipe 11, a second water outlet pipe 12, an aeration area 13, a peripheral fixing bracket 14, an aeration delivery pipe 15, an aeration hole 16, a bubble diffusion structure 17, a disc body 18, an air inlet pipe 19, a lower disc body 20, a positioning step 21, a rubber diaphragm 22, an annular gland 23, a sewage draining plate 24, a sewage draining scraper 25, a sewage draining driver 26, a driving rod 27, a movable sealing structure 28, a discharge channel 29, a sludge pump 30, a fixing plate 31, a sealing through groove 32, a movable sealing ring 33, a leakage water tank 34, a leak-proof interface 35, a packing layer 36, a backwashing water pipe 37, a backwashing aeration pipe 38, a backwashing water hole 39, a backwashing air hole 40, a first backwashing return pipe 41, a second backwashing return pipe 42, a closing valve 43, a fine filter screen 44, a mixing driver 45, a rotating shaft 46, a mixing paddle 47, a powder inlet 48, a mounting hub 49, a paddle blade 50, and a positioning sleeve 51. Detailed implementation mode

[0030] As Figures 1 - 3 shown, an alternating aeration biological filter includes an alternating aeration unit 1. The alternating aeration unit 1 includes two serially connected biological tank bodies 2. A packing unit 3 is arranged inside the biological tank body 2. An aeration assembly 4 is arranged between the packing unit 3 and the bottom of the biological tank body 2. The aeration assemblies 4 in the two serially connected biological tank bodies 2 operate alternately. A backwashing assembly 5 is also arranged inside the packing unit 3. A sewage draining tank 6 is arranged at the bottom of the biological tank body 2. A sewage draining assembly 7 is also arranged on the bottom of the biological tank body 2. The primary biological tank body 2 is connected to a mixing reaction tank 9 through a first water inlet pipe 8. A water inlet 10 is arranged on one side of the mixing reaction tank 9.

[0031] In the present utility model, domestic sewage enters the interior of the mixing reaction tank 9 from the water inlet 10 on one side of the mixing reaction tank 9. The domestic sewage is fully mixed with a medicament in the mixing reaction tank 9 to remove harmful substances in the sewage. Subsequently, the sewage flows into the primary biological tank body 2 through the first water inlet pipe 8 and comes into full contact with the packing unit 3. Subsequently, the sewage flows into the secondary biological tank body 2 and comes into full contact with the packing unit 3.

[0032] The aeration components 4 in the two series-connected bioreactor bodies 2 operate alternately in different time periods, causing the two bioreactor bodies 2 to alternate between aerobic and anaerobic states. When one bioreactor body 2 is in the aerobic state, the other bioreactor body 2 is in the anoxic state. This can improve the treatment capacity of the aeration tank without increasing energy consumption. In the aerobic stage, the microorganisms on the packing unit 3 are active and multiply in large numbers, forming a biofilm that can effectively adsorb and degrade organic pollutants and other pollutants in the sewage. In the anoxic stage, the biofilm is renewed, removing the aged microorganisms and metabolites. This alternating change helps to maintain the activity of the biofilm, thereby improving the biological treatment efficiency and promoting sludge reduction. The backwashing component 5 can wash away the excessive biofilm and suspended solid substances accumulated on the packing unit 3 to prevent blockage and ensure good filtration performance. The sewage discharge component 7 can discharge the silt deposited at the bottom of the bioreactor body 2 into the sewage discharge tank 6 to prevent the silt from accumulating at the bottom of the bioreactor body 2 and affecting the sewage treatment quality.

[0033] Specifically, in combination with Figure 1 and Figure 2 as shown, the first inlet pipe 8 is arranged at one side of the lower end of the first-stage bioreactor body 2. At the upper end of the other side of the first-stage bioreactor body 2, there is a first outlet pipe 11 communicating with the second-stage bioreactor body 2. At the lower end of the second-stage bioreactor body 2 on the side away from the first outlet pipe 11, there is a second outlet pipe 12. The packing units 3 in the two bioreactor bodies 2 are respectively located between the first inlet pipe 8 and the first outlet pipe 11 and between the first outlet pipe 11 and the second outlet pipe 12.

[0034] The sewage entering the first-stage bioreactor body 2 flows from bottom to top and comes into full contact with the packing unit 3. The first outlet pipe 11 is arranged at the upper end of the bioreactor body 2 to ensure that the sewage flows into the second-stage bioreactor body 2 after fully contacting the packing unit 3 in the first-stage bioreactor body 2. The sewage in the second-stage bioreactor body 2 flows from top to bottom and comes into full contact with the packing unit 3, which can significantly improve the sewage treatment efficiency and effect.

[0035] Specifically, in combination with Figures 1 - 3 as shown, an aeration area 13 is formed between the packing unit 3 and the bottom of the bioreactor body 2. The aeration component 4 includes an aeration delivery pipe 15 horizontally arranged in the aeration area 13 through a peripheral fixing bracket 14 arranged on the inner side wall of the bioreactor body 2 and distributed circumferentially along the inner side wall. A plurality of air holes 16 are evenly distributed along the length direction of the top of the aeration delivery pipe 15. The air inlet end of the aeration delivery pipe 15 is connected to an external aeration blower, and a bubble diffusion structure 17 is also provided on the air holes 16.

[0036] The aeration delivery pipe 15 is fixedly placed in the aeration area 13 through the peripheral fixing bracket 14. When the aeration blower operates, air is delivered into the aeration delivery pipe 15, and the air will diffuse out of the aeration holes 16 in the form of bubbles and enter the sewage. During the rising process of the bubbles, oxygen will be continuously released and dissolved into the sewage to keep the biological tank body 2 in an aerobic state. The bubble diffusion structure 17 on the aeration holes 16 can divide the large bubbles into smaller bubbles, thereby increasing the contact area between the bubbles and water. These small bubbles have a longer residence time in the sewage and can transfer oxygen to the water more effectively.

[0037] Specifically, as shown in Figures 1 - 3 , the bubble diffusion structure 17 includes a hollow disk body 18. The bottom end of the disk body 18 is provided with an air inlet pipe 19 that is hermetically connected to the aeration hole 16. The disk body 18 includes a lower disk body 20. A positioning step 21 is provided inside the lower disk body 20. A rubber diaphragm 22 is provided on the positioning step 21. A number of aeration micropores are evenly distributed on the rubber diaphragm 22. An annular gland 23 that is detachably and fixedly connected to the lower disk body 20 is provided above the rubber diaphragm 22.

[0038] The annular gland 23 is detachably connected to the lower disk body 20 through a bolt fixing member. Air enters the disk body 18 from the aeration hole 16 and diffuses out of the micropores of the rubber diaphragm 22 in the form of microbubbles and enters the sewage. The microbubbles have a larger contact area with water and a longer residence time in the sewage, improving the oxygen mass transfer efficiency. The rubber diaphragm 22 is detachably arranged on the positioning step 21 of the lower disk body 20, with convenient disassembly and assembly and easy replacement and maintenance.

[0039] Specifically, as shown in Figure 1 and Figure 2 , the sewage discharge assembly 7 includes a sewage discharge plate 24 that is horizontally slidably connected to the bottom of the biological tank body 2. A sewage scraping plate 25 is provided on the sewage discharge plate 24 near the sewage discharge tank 6. A sewage discharge driver 26 is provided outside the biological tank body 2. The output end of the sewage discharge driver 26 is connected with a driving rod 27 that passes through the outer wall of the biological tank body 2 and is connected to the sewage discharge plate 24. An active sealing structure 28 is provided between the driving rod 27 and the outer wall of the biological tank body 2.

[0040] A discharge channel 29 is provided at the bottom of the sewage discharge tank 6, and a sludge pump 30 is provided on the discharge channel 29.

[0041] A fixing plate 31 is provided at the end of the driving rod 27. The fixing plate 31 is detachably connected to the sewage discharge plate 24 through a bolt connecting member.

[0042] The sewage discharge driver 26 operates, and the output end of the sewage discharge driver 26 extends out and drives the sewage discharge plate 24 to move inwards at the bottom of the biological pond body 2 through the driving rod 27. During the movement of the sewage discharge plate 24, the silt accumulated at the bottom of the biological pond body 2 is pushed and the silt is pushed into the sewage discharge pond 6, preventing the silt from accumulating at the bottom of the biological pond body 2 and affecting the sewage treatment quality. The sewage scraping plate 25 on the side wall of the sewage discharge plate 24 can efficiently push the accumulated silt, improving the silt discharge efficiency. The movable sealing structure 28 between the driving rod 27 and the outer wall of the biological pond body 2 plays a role in sealing and preventing leakage during the telescopic process of the driving rod 27.

[0043] Specifically, as shown in Figure 2 The movable sealing structure 28 includes a sealing through groove 32 penetrating through the outer wall of the biological pond body 2. The driving rod 27 is inserted into the sealing through groove 32 and an activity sealing ring 33 is provided between the driving rod 27 and the sealing through groove 32. A leakage water tank 34 is also provided outside the biological pond body 2. An anti-leakage interface 35 covering the sealing through groove 32 is provided on the side wall of the leakage water tank 34. The driving rod 27 is inserted through the leakage water tank 34 and the anti-leakage interface 35.

[0044] The activity sealing ring 33 between the driving rod 27 and the sealing through groove 32 plays an activity sealing role during the telescopic movement of the driving rod 27, preventing sewage from flowing out of the sealing through groove 32. If there is still sewage leaking from the sealing through groove 32, it can flow into the leakage water tank 34 through the anti-leakage interface 35, effectively preventing sewage leakage.

[0045] Preferably, as shown in Figure 1 and Figure 2 The cross-section of the sewage scraping plate 25 is triangular, and the angle between the side of the sewage scraping plate 25 near the sewage discharge pond 6 and the bottom of the biological pond body 2 is an acute angle. The bottom of the biological pond body 2 is horizontally arranged or inclined towards the sewage discharge pond 6.

[0046] The sewage scraping plate 25 on the side wall of the sewage discharge plate 24 is inclined, which can scrape the accumulated silt, can shovel the accumulated silt, can efficiently push the accumulated silt, and improve the silt discharge efficiency.

[0047] Specifically, as shown in Figure 1 and Figure 2 The packing unit 3 includes a number of packing layers 36 arranged vertically in the biological pond body 2. The backwashing assembly 5 includes a number of backwashing water pipes 37 and backwashing air pipes 38 arranged alternately between the packing layers 36. A number of backwashing water holes 39 and backwashing air holes 40 are evenly distributed on the backwashing water pipes 37 and the backwashing air pipes 38 respectively. The water inlet end of the backwashing water pipe 37 and the air inlet end of the backwashing air pipe 38 are respectively connected to an external water pump and a backwashing blower.

[0048] The external water pump operates to convey water flow into the backwash water pipe 37. The water flow shoots out from the backwash water holes 39 on the backwash water pipe 37 to conduct backwash water washing on the packing layer 36. The external backwash blower operates to convey air into the backwash aeration pipe 38. The air jets out from the backwash air holes 40 on the backwash aeration pipe 38 to conduct backwash air washing on the packing layer 36, which can wash away the excessive biofilm and suspended solid substances accumulated on the packing layer 36, prevent blockage and ensure good filtration performance.

[0049] Specifically, in combination with Figure 1 and Figure 2 as shown, on one side of the upper end of the primary biological pond body 2, there is a first backwash return pipe 41 connected to the mixing reaction pond 9. There is also a second backwash return pipe 42 between the upper ends of the two series-connected biological pond bodies 2. Closing valves 43 are respectively arranged in the first backwash return pipe 41 and the second backwash return pipe 42. A fine filter screen 44 is arranged in the biological pond body 2 between the second backwash return pipe 42 and the first water outlet pipe 11.

[0050] The fine filter screen 44 between the second backwash return pipe 42 and the first water outlet pipe 11 functions to isolate suspended particulate impurities.

[0051] The biofilm and solid suspended matters washed off from the packing layer 36 in the secondary biological pond body 2 can flow back into the primary biological pond body 2 through the second backwash return pipe 42, and together with the biofilm and solid suspended matters washed off from the packing layer 36 in the primary biological pond body 2, flow back into the mixing reaction pond 9 through the first backwash return pipe 41 for re-mixing.

[0052] Specifically, in combination with Figure 1 as shown, a mixing driver 45 is arranged at the top of the mixing reaction pond 9. The output end of the mixing driver 45 is connected to a rotating shaft 46 that penetrates through the top of the mixing reaction pond 9 and extends into the interior of the mixing reaction pond 9. Mixing paddles 47 are arranged on the rotating shaft 46. A powder inlet 48 is also arranged at the top of the mixing reaction pond 9.

[0053] The mixing paddle 47 includes a mounting hub 49 sleeved on the rotating shaft 46. Paddle blades 50 are arranged on the outer side of the mounting hub 49. Positioning sleeves 51 are respectively arranged at both ends of the mounting hub 49. The positioning sleeves 51 and the rotating shaft 46 are detachably connected through bolt connectors.

[0054] When the mixing driver 45 operates, the output end of the mixing driver 45 rotates to drive the rotating shaft 46 to rotate. The mixing paddles 47 on the rotating shaft 46 rotate to stir and mix the sewage and the medicament, removing harmful substances in the sewage.

[0055] The working principle of the present utility model is as follows: Domestic sewage enters the interior of the mixing reaction tank 9 from the water inlet 10 on one side of the mixing reaction tank 9. Chemical agents are added through the powder inlet 48 at the top of the mixing reaction tank 9. The mixing drive 45 drives the mixing paddle 47 to rotate, so that the sewage and the chemical agents are stirred and mixed to remove harmful substances in the sewage. Subsequently, the sewage enters the primary biological tank body 2 through the first water inlet pipe 8, flows upward from bottom to top in the primary biological tank body 2 and comes into full contact with the packing unit 3. Then it enters the secondary biological tank body 2 through the first water outlet pipe 11 and flows downward from top to bottom in the secondary biological tank body 2 and comes into full contact with the packing unit 3. Finally, the treated sewage is discharged through the second water outlet pipe 12.

[0056] The aeration components 4 in the two series-connected biological tank bodies 2 operate alternately in different time periods, so that the two biological tank bodies 2 alternate between aerobic and anaerobic states. The sewage discharge drive 26 drives the sewage discharge plate 24 to move inward at the bottom of the biological tank body 2. During the movement of the sewage discharge plate 24, the silt deposited at the bottom of the biological tank body 2 is pushed and discharged into the sewage discharge tank 6. The silt in the sewage discharge tank 6 is discharged through the discharge channel 29 and the silt pump 30. The backwash water pipe 37 and the backwash air pipe 38 perform backwash water washing and backwash air washing on the packing layer 36. The biological film and solid suspended matter washed off from the packing layer 36 can flow back to the mixing reaction tank 9 through the second backwash return pipe 42 and the first backwash return pipe 41 for re-mixing.

[0057] The specific embodiments described herein are merely illustrative of the spirit of the present utility model. Those skilled in the technical field to which the present utility model pertains can make various modifications or supplements to the described specific embodiments or use similar methods for substitution, but will not deviate from the spirit of the present utility model or exceed the scope defined by the appended claims.

[0058] Although the alternating aeration unit 1, biological tank body 2, packing unit 3, aeration component 4, backwashing component 5, sewage discharge tank 6, sewage discharge component 7, first water inlet pipe 8, mixing reaction tank 9, water inlet 10, first water outlet pipe 11, second water outlet pipe 12, aeration area 13, peripheral fixed support 14, aeration delivery pipe 15, air holes 16, bubble diffusion structure 17, disc body 18, air inlet pipe 19, lower disc body 20, positioning step 21, rubber diaphragm 22, annular gland 23, sewage discharge plate 24, sewage scraping plate 25, sewage discharge driver 26, driving rod 27, movable sealing structure 28, discharge channel 29, sludge pump 30, fixing plate 31, sealing through groove 32, movable sealing ring 33, leakage water tank 34, leak-proof interface 35, packing layer 36, backwashing water pipe 37, backwashing air pipe 38, backwashing water holes 39, backwashing air holes 40, first backwashing return pipe 41, second backwashing return pipe 42, closing valve 43, fine filter screen 44, mixing driver 45, rotating shaft 46, mixing paddle 47, powder inlet 48, mounting hub 49, blade 50, positioning sleeve 51, etc. are used more frequently in this text, using these terms is only for more convenient description and explanation of the essence of the present utility model; interpreting them as any additional limitation is contrary to the spirit of the present utility model.

Claims

1. An alternating aerated biological filter, characterized in that: The invention comprises an alternating aeration unit (1), wherein the alternating aeration unit (1) comprises two biological pools (2) connected in series, wherein a filler unit (3) is arranged in the biological pool (2), an aeration assembly (4) is arranged between the filler unit (3) and the bottom of the biological pool (2), the aeration assemblies (4) in the two biological pools (2) connected in series operate alternately, the filler unit (3) is further provided with a backwash assembly (5), the bottom of the biological pool (2) is provided with a sewage tank (6), the bottom of the biological pool (2) is further provided with a sewage tank (7), the biological pool (2) at the first stage is connected to a mixing reaction pool (9) through a first water inlet pipe (8), and a water inlet (10) is arranged on one side of the mixing reaction pool (9).

2. The alternating aerated biological filter according to claim 1, characterized in that: The first water inlet pipe (8) is arranged on one side of the lower end of the primary biological pool body (2); the upper end of the other side of the primary biological pool body (2) is provided with a first water outlet pipe (11) connected to the secondary biological pool body (2); the lower end of the secondary biological pool body (2) away from the first water outlet pipe (11) is provided with a second water outlet pipe (12); the packing units (3) in the two biological pool bodies (2) are respectively located between the first water inlet pipe (8) and the first water outlet pipe (11) and between the first water outlet pipe (11) and the second water outlet pipe (12).

3. The alternating aerated biological filter according to claim 1, characterized in that: An aeration area (13) is formed between the filler unit (3) and the bottom of the biological pond (2). The aeration assembly (4) comprises an aeration conveying pipe (15) horizontally arranged in the aeration area (13) via a peripheral fixing bracket (14) arranged on the inner wall of the biological pond (2) and distributed along the circumference of the inner wall. The top of the aeration conveying pipe (15) is evenly distributed with a plurality of aeration holes (16) along the length direction of the aeration conveying pipe (15). The air inlet end of the aeration conveying pipe (15) is connected to an external aeration blower. The aeration hole (16) is also provided with a bubble diffusion structure (17).

4. The alternating aerated biological filter according to claim 3, characterized in that: The bubble diffusion structure (17) comprises a hollow disc body (18), the bottom end of the disc body (18) is provided with an air inlet pipe (19) which is sealed and connected to the aeration hole (16), the disc body (18) comprises a lower disc body (20), a positioning step (21) is provided in the lower disc body (20), a rubber diaphragm (22) is provided on the positioning step (21), a plurality of aeration micropores are evenly distributed on the rubber diaphragm (22), and an annular pressure cover (23) which is detachably fixedly connected to the lower disc body (20) is provided at the upper end of the rubber diaphragm (22).

5. The alternating aerated biological filter according to claim 1, characterized in that: The sewage discharge assembly (7) comprises a sewage discharge plate (24) horizontally slidably connected to the bottom of the biological pool body (2); the sewage discharge plate (24) is provided with a sewage discharge scraper (25) near the sewage discharge pool (6); a sewage discharge driver (26) is provided outside the biological pool body (2); the output end of the sewage discharge driver (26) is connected to a driving rod (27) penetrating the outer wall of the biological pool body (2) and connected to the sewage discharge plate (24); a movable sealing structure (28) is provided between the driving rod (27) and the outer wall of the biological pool body (2).

6. The alternating aerated biological filter according to claim 5, characterized in that: The movable sealing structure (28) comprises a sealing groove (32) penetrating the outer wall of the biological pool body (2); the driving rod (27) is passed through the sealing groove (32) and a movable sealing ring (33) is provided between the driving rod (27) and the sealing groove (32); a water leakage box (34) is also provided outside the biological pool body (2); a leak-proof interface (35) covering the sealing groove (32) is provided on the side wall of the water leakage box (34); and the driving rod (27) is passed through the water leakage box (34) and the leak-proof interface (35).

7. The alternating aerated biological filter according to claim 5, characterized in that: The cross section of the sewage scraper (25) is triangular, and the angle between the sewage scraper (25) near the sewage tank (6) and the bottom of the biological tank body (2) is an acute angle, and the bottom of the biological tank body (2) is horizontally arranged or inclined toward the sewage tank (6).

8. The alternating aerated biological filter according to claim 1, characterized in that: The packing unit (3) comprises a plurality of packing layers (36) arranged from top to bottom in the biological pool body (2); the backwashing assembly (5) comprises a plurality of backwashing water pipes (37) and backwashing aeration pipes (38) arranged alternately between the packing layers (36); a plurality of backwashing water holes (39) and backwashing air holes (40) are evenly distributed on the backwashing water pipes (37) and the backwashing aeration pipes (38); the water inlet end of the backwashing water pipe (37) and the air inlet end of the backwashing aeration pipe (38) are respectively connected to an external water pump and a backwashing blower.

9. The alternating aerated biological filter according to claim 8, characterized in that: A first backwash return pipe (41) connected to the mixing reaction tank (9) is provided on one side of the upper end of the biological pool body (2) described in the first stage, and a second backwash return pipe (42) is provided between the upper ends of the two biological pool bodies (2) connected in series. Closing valves (43) are provided in the first backwash return pipe (41) and the second backwash return pipe (42), respectively. A fine filter screen (44) is provided in the biological pool body (2) between the second backwash return pipe (42) and the first water outlet pipe (11).

10. The alternating aerated biological filter according to any one of claims 1 to 9, characterized in that: A mixing driver (45) is provided at the top of the mixing reaction tank (9), and an output end of the mixing driver (45) is connected to a rotating shaft (46) which passes through the top of the mixing reaction tank (9) and extends into the interior of the mixing reaction tank (9), and a mixing paddle (47) is provided on the rotating shaft (46). A powder inlet (48) is also provided at the top of the mixing reaction tank (9).

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