Wetland water quality purification system based on micro bubble aeration

Abstract

The invention relates to the technical field of water treatment, in particular to a wetland water quality purification system based on microbubble aeration, which comprises a pretreatment area, a U-shaped vertical flow purification area and a rear overflow dam which are sequentially arranged from front to back, the pretreatment area comprises a front filter bed, a sedimentation tank and a porous overflow dam, a partition wall is arranged between the porous overflow dam and the rear overflow dam, and partition holes through which water flows are formed in the bottom of the outer wall of the partition wall; the U-shaped vertical flow purification area comprises an aerobic area, an anaerobic area, a facultative aerobic area and an enhanced reoxygenation area; the aerobic area and the anaerobic area are respectively formed on the surface of a cavity between the partition wall and the porous overflow dam and below the cavity; and the facultative aerobic region and the enhanced reoxygenation region are respectively formed below and on the surface of the cavity between the partition wall and the rear overflow dam. Water flow passes through the pretreatment area for preliminary pollutant removal, and the water flow passes through the U-shaped vertical flow purification area, so that pollutant removal can be improved.

Description

Technical Field

[0001] The invention relates to the technical field of water treatment, and in particular to a wetland water purification system based on micro bubble aeration. Background Art

[0002] Existing wetland water purification systems often use filter pools to achieve water purification through natural sedimentation. The water purification period is long, the purification quality is low, and the later operation and maintenance costs of the wetland system filter pool are high, which is not conducive to the cost control link of engineering construction to reduce costs and increase efficiency. The existing pre-treatment systems for rural low-pollution wastewater or urban polluted water entering ponds or rivers are mostly intermittent treatment modes, requiring water flow to stay for treatment, which increases the management cost of the system, and the microbial activity is not high, the diversity is low, and the domestication time is long; the treatment efficiency is not high and the area occupied is large. Summary of the invention

[0003] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a wetland water purification system based on fine bubble aeration. The water flows through a pretreatment area to remove preliminary pollutants, and the water flows through a U-shaped vertical flow purification area to improve the removal of pollutants; elastic three-dimensional fillers are suspended in the water flow downward area of ​​the U-shaped vertical flow purification area as microbial carriers, which increase anaerobic links for the main anaerobic area and improve the total nitrogen removal rate; combined fillers are suspended in the water flow upward area as microbial carriers, and membrane aeration biofilm reactors with controllable heights are arranged at intervals. Combined with the technology, the oxygen content of the regional water body is improved, the establishment of a nitrification system is promoted, and the processing load is increased. The membrane aeration biofilm reactor can control the height and the aeration power of the hollow fiber membrane can be adjusted.

[0004] In order to achieve the purpose of the present invention, the technical solution adopted by the present invention is: The present invention discloses a wetland water purification system based on micro-bubble aeration, and the wetland water purification system based on micro-bubble aeration is characterized in that it comprises a pre-treatment area, a U-shaped vertical flow purification area and a rear overflow dam which are arranged in sequence from front to back, the pre-treatment area comprises a pre-filter bed, a sedimentation tank and a porous overflow dam, the pre-filter bed is arranged in front of the top of the soil foundation, the porous overflow dam is arranged behind the pre-filter bed, the bottom of the porous overflow dam is fixed to the bottom of the soil foundation, the sedimentation tank is formed between the porous overflow dam and the pre-filter bed, and the sedimentation tank is arranged on the A square groove is formed on the top of the soil foundation, a plurality of overflow holes for water to flow through are arranged on the upper part of the outer wall of the porous overflow dam, a partition wall is arranged between the porous overflow dam and the rear overflow dam, and the outer wall bottom of the partition wall is provided with partition holes for water to flow through; the U-shaped vertical flow purification area includes an aerobic area, an anaerobic area, a facultative aerobic area and an enhanced reoxygenation area, the cavity surface and the bottom of the cavity between the partition wall and the porous overflow dam respectively form the aerobic area and the anaerobic area; the cavity bottom and the cavity surface between the partition wall and the rear overflow dam respectively form the facultative aerobic area and the enhanced reoxygenation area.

[0005] A plurality of elastic three-dimensional fillers are evenly distributed in the aerobic area, the anaerobic area and the facultative aerobic area; a plurality of combined fillers are arranged at intervals in the enhanced reoxygenation area, and a membrane aeration biofilm reactor with adjustable height is arranged between the combined fillers.

[0006] A submersible pump is fixed in the water behind the rear overflow dam, the input end of the submersible pump is connected to the water body behind the rear overflow dam, the output end of the submersible pump is connected to the input end of the water pipe, and the output end of the water pipe is connected to the interior of the pre-filter bed.

[0007] The output end of the submersible pump is connected to the water delivery pipe and the input end of the wave-making aeration water pipe through a three-way pipe, the output end of the wave-making aeration water pipe is connected to the facultative aerobic area, the top of the outer wall of the wave-making aeration water pipe is connected to the bottom end of the air inlet pipe, and the top of the air inlet pipe is connected to the air above.

[0008] The membrane aeration biofilm reactor adjusts the height of both in the water body through a lifting mechanism; the lifting mechanism includes a bottom plate, a vertical pole, a support pole, a front plate, a rear plate, a side plate, a driving shaft, a rotating rod, a driving gear, a driven shaft and a driven gear, the bottom plate is fixed to the ground on the shore, the bottom end of the vertical pole is connected to the top of the bottom plate, the vertical pole is a hollow square structure, and a hinge shaft for hinged connection with the upper right side wall of the front plate and the rear plate is provided between the top ends of the front and rear walls, the side plate is connected to the side walls of the front plate and the rear plate to form a mounting shell of a hollow structure, the driving shaft is arranged between the lower right side walls of the front plate and the rear plate, and the front end of the driving shaft passes through the front plate It is connected to one end of the rotating rod; the driving gear is sleeved on the rear side of the active shaft; the driven shaft is provided between the middle parts of the side walls of the front plate and the rear plate, and the driven gear is sleeved on the rear side of the driven shaft and meshes with the driving gear; the support rod is a hollow square structure with openings at both ends, and a fixed pulley is installed at the opening at the right end; the front and rear walls of the left end of the support rod are respectively fixedly connected to the upper right corner of the inner walls of the front plate and the rear plate; a suspension wire is wound around the outside of the driven shaft, and one end of the suspension wire passes through the inner cavity of the support rod and the fixed pulley and is connected to the lifting mechanism; a limiting mechanism for limiting the rotation of the mounting shell and the support rod is provided inside the mounting shell.

[0009] A locking mechanism is provided inside the mounting shell, and the locking mechanism includes a rotating shaft, a pawl, a ratchet, a torsion spring and an unlocking block, the two ends of the rotating shaft respectively pass through the lower left side walls of the front plate and the rear plate, the left end of the pawl is provided with a pawl hole for connecting with the outer wall of the rotating shaft, the right end of the pawl is a hook-shaped structure, the ratchet is axially fixed to the front side of the driving shaft, and the hook-shaped structure at the right end of the pawl is matched and engaged; the torsion spring is mounted on the outside of the rotating shaft between the pawl and the front plate, one end of the torsion spring is connected to the middle part of the front wall of the pawl, and the other end of the torsion spring is connected to the rear wall of the front plate; the outer end of the rotating shaft passes through the front plate and is connected to the unlocking block.

[0010] The limiting mechanism includes a limiting arm, a hook-shaped portion, a lever, a lever hole, a square hole and a clamping rod. The left end of the limiting arm is provided with a limiting arm hole for being mounted on the rear side of the outer wall of the rotating shaft, the right end of the limiting arm forms the hook-shaped portion bent downward, the middle part of the outer wall of the limiting arm is provided with the lever, the front plate is provided with the lever hole for the sliding of the lever, the length of the lever hole is greater than the outer diameter of the clamping rod, and the lever hole is an arc-shaped structure with the rotating shaft as the center; the square hole for the hook-shaped portion to pass through is provided on the upper side of the left side wall of the vertical rod, and the clamping rod for matching and clamping with the hook-shaped portion is provided at the bottom of the square hole.

[0011] The hanging mechanism comprises a hanging wire connection block, a hanging block, a hanging rod and a mounting rod. The hanging wire connection block is roughly in an isosceles triangle structure, and a hanging wire hole for connecting with the bottom end of the hanging wire is provided in the middle of the upper part of its outer wall. The hanging block is in a square structure, and the middle of its top end is connected to the bottom end of the hanging wire connection block. Hanging rod connection holes for connecting with the hanging rod are provided on both sides of the outer wall of the hanging block; a plurality of mounting rods in an inverted "U" shape are evenly spaced at the top of the membrane aeration biofilm reactor along its length direction.

[0012] Inclined lifting holes are provided at the lower sides of the side walls of the lifting wire connection block; and a plurality of lifting rod connection holes are mirror-imaged and evenly spaced on the side walls of the lifting block.

[0013] The lifting rod and the lifting rod connecting hole are connected by a connecting mechanism, and the connecting mechanism includes a first limit block, a second limit block, a limit ring and a limit hole. The first limit block is in a square structure and is arranged on the top rear side of the lifting rod. The second limit block is in a square structure and is arranged on the middle left side of the lifting rod. The distance between the rear end of the second limit block and the front end of the first limit block is greater than the thickness of the lifting block. The top of the lifting rod connecting hole is the square hole with the same cross-sectional shape as the first limit block and the second limit block; the inner wall of the limit ring is fixed to the outer wall of the lifting rod, and the distance between the rear end of the limit ring and the front end of the second limit block is equal to the thickness of the lifting block.

[0014] The beneficial effects of the present invention are: (1) The water flow of the present invention passes through the pretreatment area to remove preliminary pollutants, and the water flow passes through the U-shaped vertical flow purification area to improve the removal of pollutants; the elastic three-dimensional filler is suspended in the water flow downward area of ​​the U-shaped vertical flow purification area as a microbial carrier, which adds anaerobic links to the main anaerobic area and improves the total nitrogen removal rate; the combined filler is suspended in the water flow upward area as a microbial carrier, and at the same time, a membrane aerated biofilm reactor (MABR) with controllable height is arranged at intervals. Combined with (MABR) technology, the oxygen content of the regional water body is improved, the establishment of the nitrification system is promoted, and the treatment load is increased. The membrane aerated biofilm reactor can control the height, and the aeration power of the hollow fiber membrane can be adjusted. The membrane aerated biofilm is placed at the rear end of the water flow to reduce the attachment of pollutants and reduce clogging. The filler is mixed at intervals to reduce the construction cost and further improve the oxygen utilization rate of the aerobic area.

[0015] (2) The present invention provides a submersible pump to pump the water behind the rear overflow dam into the front filter bed, thereby improving the water circulation capacity and enhancing the self-purification capacity of the water body when the water level is insufficient. The microorganisms in the water at the rear side are pumped into the sedimentation tank to improve the diversity of microorganisms. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1It is a structural schematic diagram of the present invention; Figure 2 It is a top view schematic diagram of the present invention; Figure 3 It is a structural schematic diagram of the lifting mechanism in the present invention; Figure 4 It is a schematic diagram of the structure of the installation shell in the present invention; Figure 5 It is a schematic diagram of the structure installed in the shell in the present invention; Figure 6 is a cross-sectional schematic diagram of the limiting mechanism in the present invention; Figure 7 It is an exploded schematic diagram of the hoisting mechanism and the connecting mechanism in the present invention; Figure 8 for Figure 7 main view.

[0017] In the figure: 1 pretreatment area, 11 pre-filter bed, 12 sedimentation tank, 13 porous overflow dam, 14 overflow hole, 2U-type vertical flow purification area, 21 aerobic area, 22 anaerobic area, 23 facultative aerobic area, 24 enhanced reoxygenation area, 25 elastic three-dimensional filler, 26 combined filler, 27 membrane aeration biofilm reactor, 3 rear overflow dam, 4 partition wall, 5 wave-making aeration water pipe, 6 air inlet pipe, 7 submersible pump, 8 lifting mechanism, 9 soil foundation, 81 bottom plate, 82 vertical pole, 83 support pole, 84 front plate, 85 rear plate, 86 side plate, 87 driving shaft, 88 rotating rod, 89 driving gear, 90 driven shaft, 91 driven Gear, 92 articulated shaft, 93 suspension wire, 100 lifting mechanism, 101 suspension wire connecting block, 102 lifting block, 103 lifting rod, 104 mounting rod, 105 suspension wire hole, 106 lifting rod connecting hole, 107 inclined lifting hole, 110 limiting mechanism, 111 limiting arm, 112 hook-shaped portion, 113 lever, 114 lever hole, 115 square hole, 116 clamping rod, 120 locking mechanism, 121 rotating shaft, 122 pawl, 123 ratchet, 124 torsion spring, 125 unlocking block, 130 connecting mechanism, 131 first limiting block, 132 second limiting block, 133 limiting ring, 134 limiting hole. DETAILED DESCRIPTION

[0018] The present invention is further described below: See also Figure 1-8 , The present invention discloses a wetland water purification system based on fine bubble aeration, comprising a pretreatment area 1, a U-shaped vertical flow purification area 2 and a rear overflow dam 3 which are arranged in sequence from front to back, wherein the pretreatment area 1 comprises a prefilter bed 11, a sedimentation tank 12 and a porous overflow dam 13, wherein the prefilter bed 11 is arranged in front of the top of a soil foundation 9, the porous overflow dam 13 is arranged behind the prefilter bed 11, the bottom of the porous overflow dam 13 is fixed to the bottom of the soil foundation 9, the sedimentation tank 12 is formed between the porous overflow dam 13 and the prefilter bed 11, the sedimentation tank 12 is a square groove arranged at the top of the soil foundation 9, the prefilter bed 11 and the sedimentation tank 12 are "L"-shaped grooves dug at the top of the soil foundation 9, instead of completely digging the soil foundation 11 to the bottom, thereby reducing the cost without affecting the use effect, and the porous overflow dam 1 3 is provided with a plurality of overflow holes 14 for water to flow through on the upper side of the outer wall, a partition wall 4 is provided between the porous overflow dam 13 and the rear overflow dam 3, and a partition hole 41 for water to flow through is provided at the bottom of the outer wall of the partition wall 4; the U-shaped vertical flow purification area 2 includes an aerobic area 21, an anaerobic area 22, a facultative aerobic area 23 and an enhanced reoxygenation area 24, and the cavity surface and the bottom of the cavity between the partition wall 4 and the porous overflow dam 13 respectively form the aerobic area 21 and the anaerobic area 22; the cavity bottom and the cavity surface between the partition wall 4 and the rear overflow dam 3 respectively form the facultative aerobic area 23 and the enhanced reoxygenation area 24, and the water flows through the pretreatment area 1 for preliminary pollutant removal, and the water flows through the U-shaped vertical flow purification area 2 to enhance the removal of pollutants, and the first half of the U-shaped vertical flow is a downward water flow, and the second half is an upward water flow. There is no aeration equipment at the bottom of the anaerobic area 22, so the lower the dissolved oxygen in the water body, the lower the water body is, forming an anaerobic environment. Entering the upward water flow, the membrane aeration biofilm reactor 27 provides a large amount of oxygen to the water body, which speeds up the reoxygenation efficiency of the water body, forms an aerobic-anaerobic-aerobic water flow, and improves the biochemical effect and removal efficiency of various pollutants; the existing pre-treatment system for rural low-pollution wastewater or urban polluted water entering the pond surface or river is mostly an intermittent treatment mode, which requires the water flow to stay for treatment, increasing the management cost of the system. The present invention is a continuous cycle treatment mode, the treatment is continuous, more in line with the law of natural occurrence, and reduces management costs.

[0019] Furthermore, a number of elastic three-dimensional fillers 25 are evenly distributed in the aerobic area 21, the anaerobic area 22, and the facultative aerobic area 23; the enhanced reoxygenation area 24 is provided with a number of composite fillers 26 at intervals, and a membrane aeration biofilm reactor 27 with adjustable height is provided between the composite fillers 26; the elastic three-dimensional fillers 25 are suspended in the water flow downward area of ​​the U-shaped vertical flow purification area 2 as microbial carriers, which add anaerobic links to the main anaerobic area 22 and improve the total nitrogen removal rate; the composite fillers 26 are suspended in the water flow upward area as microbial carriers, and at the same time, membrane aeration biofilm reactors 27MABR with controllable height are arranged at intervals, combined with MABR technology, to improve the oxygen content of regional water, promote the establishment of nitrification system, and increase the processing load. The membrane aeration biofilm reactor 27 can control the height, and the aeration power of the hollow fiber membrane can be adjusted; the unique layered structure of MABR gives it the following advantages: the high dissolved oxygen concentration inside the biofilm provides sufficient oxygen for aerobic nitrifying bacteria, and the low organic matter concentration inhibits the growth of heterotrophic bacteria that compete with nitrifying bacteria for oxygen, thereby improving the rate of nitrification reaction. The dissolved oxygen concentration outside the biofilm is low and the organic matter is sufficient, which provides a good anaerobic environment and sufficient carbon source for anaerobic denitrifying bacteria, greatly improving the rate of denitrification reaction. Nitrification and denitrification can be carried out in the same biofilm, and synchronous nitrification and denitrification can be achieved; MABR membrane materials are mainly divided into three categories: hydrophobic microporous membranes such as polypropylene, polytetrafluoroethylene, etc., dense membranes such as silicone resin, etc., and composite membranes with very thin functional layers. MABR aeration membranes are mainly divided into two categories: microporous membranes such as polypropylene membranes, polytetrafluoroethylene membranes, etc. and dense membranes (such as silicone rubber membranes). Both membranes can supply oxygen in the form of bubbleless aeration. When supplying oxygen in bubbleless aeration, the oxygen utilization rate can theoretically reach 100%. During operation, the aeration rate is adjusted by adjusting the aeration pressure. The main advantages of using bubbleless aeration are: ① High oxygen utilization rate and reduced energy consumption. Compared with the traditional biofilm method, bubbleless aeration reduces the mass transfer resistance of the bubble liquid film to oxygen. In addition, since oxygen in bubbleless aeration diffuses directly into the water in the form of molecules rather than bubbles, the gas-liquid contact area is large and the residence time of oxygen in the liquid phase is long. Therefore, the mass transfer resistance is much smaller than that of conventional aeration, which greatly improves the oxygen utilization rate and reduces energy consumption. ② The loss of volatile pollutants by airlift is small, avoiding secondary pollution. The bubbles generated by bubble aeration have surface tension. Some volatile pollutants in the water can easily adhere to the bubbles and rise with the bubbles into the aerated environment, while bubbleless aeration avoids this kind of volatile pollutant airlift loss, which is more environmentally friendly than bubble aeration. ③ The biofilm is not easy to fall off. Bubbleless aeration reduces the friction of bubbles on the biofilm growing on the carrier, so that the biofilm can be more firmly attached to the carrier and not easy to fall off.④ When designing the reactor, the gas phase and the liquid phase can be considered separately. During the MABR bubbleless aeration process, the gas phase and the liquid phase are separated, and the mixing of the oxygen supply and the solution does not affect each other; the membrane aerated bioreactor 27 can adjust the height through the lifting mechanism 9, which can control the external pressure of the water body. Combined with the internal pressure regulation of the membrane aerated biofilm reactor 27, the risk of reactor blockage can be effectively reduced; in addition, the lifting of the membrane aerated bioreactor 27 can more flexibly adjust the oxygen ratio and the depth of the reoxygenation interval, improve pollutant removal efficiency, and reduce operating costs.

[0020] Furthermore, a submersible pump 7 is fixed in the water behind the rear overflow dam 3, and the input end of the submersible pump 7 is connected to the water body behind the rear overflow dam 3, and the output end of the submersible pump 7 is connected to the input end of the water pipe 71, and the output end of the water pipe 71 is connected to the interior of the pre-filter bed 11. By arranging the submersible pump 7 to pump the water body behind the rear overflow dam 3 into the pre-filter bed 11, the water circulation capacity can be improved, and the self-purification capacity of the water body can be improved when the water level is insufficient, and the microorganisms in the water quality on the rear side can be pumped to the pre-filter bed 11, thereby improving the diversity of microorganisms. The failure rate of the submersible pump 7 is low. By fixing the submersible pump 7 in the water body, it can be ensured that the submersible pump 7 will not enter the silt on the bottom of the water, thereby extending its service life.

[0021] Furthermore, the output end of the submersible pump 7 is connected to the water pipe 71 and the input end of the wave-making aeration water pipe 5 through a three-way pipe, the output end of the wave-making aeration water pipe 5 is connected to the facultative aerobic area 23, the top of the outer wall of the wave-making aeration water pipe 5 is connected to the bottom end of the air inlet pipe 6, the top of the air inlet pipe 6 is connected to the air above, and the submersible pump 7 pumps microbubble water into the facultative aerobic area 23, providing oxygen while accelerating the diversity and reproduction of microbial populations; the oxygen supply can be further increased by connecting the air inlet pipe 6 at the top of the wave-making aeration water pipe 5. When the submersible pump 7 pumps microbubble water into the facultative aerobic area 23, a negative pressure is formed at the bottom of the air inlet pipe 6, which can press the air at the top of the air inlet pipe 6 into the wave-making aeration water pipe 5.

[0022] Furthermore, the membrane aeration biofilm reactor 27 is adjusted in height in the water body by a lifting mechanism 8; the lifting mechanism 8 includes a bottom plate 81, a vertical rod 82, a support rod 83, a front plate 84, a rear plate 85, a side plate 86, a driving shaft 87, a rotating rod 88, a driving gear 89, a driven shaft 90 and a driven gear 91, the bottom plate 81 is fixed to the ground on the shore, the bottom end of the vertical rod 82 is connected to the top of the bottom plate 81, the vertical rod 82 is a hollow square structure, and a support rod 83 is provided between the tops of the front and rear walls for The hinge shaft 92 is hinged to the upper right side wall of the front plate 84 and the rear plate 85, and the side plate 86 is connected to the side walls of the front plate 84 and the rear plate 85 to form a hollow structure installation shell. The driving shaft 87 is arranged between the lower right side walls of the front plate 84 and the rear plate 85, and the front end of the driving shaft 87 passes through the front plate 84 and is connected to one end of the rotating rod 88; the driving gear 89 is sleeved on the rear side of the driving shaft 87; the driven shaft 90 is arranged between the middle parts of the side walls of the front plate 84 and the rear plate 85, and the The driven gear 91 is sleeved on the rear side of the driven shaft 90 and meshes with the driving gear 89; the support rod 83 is a square structure with two ends open in the middle, and a fixed pulley is installed at the right end opening. The front and rear walls of the left end of the support rod 83 are fixedly connected to the upper right of the inner wall of the front plate 84 and the rear plate 85 respectively. A suspension wire 93 is wound around the outside of the driven shaft 90, and one end of the suspension wire 93 passes through the inner cavity of the support rod 83 and the fixed pulley and is connected to the lifting mechanism 100; the interior of the mounting shell is provided with a The limiting mechanism 110 that limits the rotation of the mounting shell and the support rod 83 can adjust the height of the membrane aerated biofilm reactor 27 through the lifting mechanism 6. Specifically, when the height of the membrane aerated biofilm reactor 27 needs to be raised, the rotating rod 88 is rotated clockwise to drive the active shaft 87 and the driving gear 89 to rotate clockwise, and at the same time drive the driven gear 91 and the driven shaft 90 to rotate clockwise. The suspension line 93 wrapped around the driven shaft 90 is gradually tightened to increase the height of the membrane aerated biofilm reactor 27; and vice versa.

[0023] Furthermore, a locking mechanism 120 is provided inside the mounting shell, and the locking mechanism 120 includes a rotating shaft 121, a pawl 122, a ratchet 123, a torsion spring 124 and an unlocking block 125. The two ends of the rotating shaft 121 pass through the lower left side walls of the front plate 84 and the rear plate 85 respectively, and the left end of the pawl 122 is provided with a pawl hole for connecting with the outer wall of the rotating shaft 121. The right end of the pawl 122 is a hook-shaped structure. The axial direction of the ratchet 123 is fixed to the driving shaft 87. On the front side, the hook-shaped structure at the right end of the pawl 122 is matched and engaged; the torsion spring 124 is set on the outside of the rotating shaft 121 between the pawl 122 and the front plate 84, one end of the torsion spring 124 is connected to the middle of the front wall of the pawl 122, and the other end of the torsion spring 124 is connected to the rear wall of the front plate 84. When the height of the membrane aeration biofilm reactor 27 needs to be raised, the user rotates the rotating rod 88 clockwise to drive the driving shaft 87 and the ratchet 123 to rotate clockwise. When the left arm surface of the wheel 123 contacts the right wall of the hook structure at the right end of the ratchet 122, the right end of the ratchet 122 can be pressed downward. At this time, the torsion spring 124 is in a compressed state. When the hook structure passes through a tooth of the ratchet 123, it moves upward due to the reset action of the torsion spring 124. The left end of the hook structure can be engaged with the right end of the tooth of the ratchet 123 to ensure that after rising to a suitable position and the rotating rod 88 stops rotating, it will not rotate counterclockwise, which can be used to control the membrane aeration biofilm reactor 27. When the height of the membrane aeration biofilm reactor 27 needs to be lowered, the unlocking block 125 is first rotated clockwise to drive the rotating shaft 121 and the pawl 122 to rotate clockwise, so that the hook structure of the pawl 122 will no longer be engaged with the teeth of the ratchet 123, and then the rotating rod 88 is slowly rotated counterclockwise to lower the height of the membrane aeration biofilm reactor 27 to a suitable position, and the card unlocking block 125 is then sent to re-engage the pawl 122 with the ratchet 123.

[0024] Furthermore, the limiting mechanism 110 includes a limiting arm 111, a hook portion 112, a lever 113, a lever hole 114, a square hole 115 and a clamping rod 116. The left end of the limiting arm 111 is provided with a limiting arm hole for being fitted on the rear side of the outer wall of the rotating shaft 121, the right end of the limiting arm 111 forms the hook portion 112 bent downward, the middle part of the outer wall of the limiting arm 111 is provided with the lever 113, the front plate 84 is provided with the lever hole 114 for the sliding of the lever 113, the length of the lever hole 114 is greater than the outer diameter of the clamping rod 116, and the lever hole 114 is an arc-shaped structure with the rotating shaft 121 as the center; the square hole 115 for the hook portion 112 to pass through is provided on the upper left side wall of the vertical rod 82, and the bottom of the square hole 115 is provided with a hole for mating with the hook portion 112 The clamping rod 116 with clamping connection can ensure that the support rod 83 does not rotate during operation by setting the limiting mechanism 11. When the lifting mechanism 6 needs to be transported or stored, the supporting rod 83 can be rotated to a state parallel to the vertical rod 82 by unlocking the limiting mechanism 11 for easy transportation and storage. Specifically, when the lifting mechanism 6 is working, the hook-shaped portion 112 at the right end of the limiting arm 111 passes through the square hole 115 on the left side wall of the vertical rod 82 and is clamped with the clamping rod 116 to complete the limiting of the supporting rod 83, ensuring that the supporting rod 83 does not rotate during operation. When the lifting mechanism 6 needs to be transported and stored, the user pushes the lever 113 upward along the lever hole 114, and the lever 113 drives the hook-shaped portion 112 to rotate counterclockwise to release the clamping rod 116. At this time, the supporting rod 83 can be rotated clockwise to a state parallel to the vertical rod 82.

[0025] Furthermore, the hanging mechanism 100 includes a hanging wire connection block 101, a hanging block 102, a hanging rod 103 and a mounting rod 104. The hanging wire connection block 101 is roughly an isosceles triangle structure, and a hanging wire hole 105 for connecting to the bottom end of the hanging wire 93 is provided in the middle of the upper part of its outer wall. The hanging block 102 is a square structure, and the middle of its top is connected to the bottom end of the hanging wire connection block 101. Hanging rod connection holes 106 for connecting to the hanging rod 103 are provided on both sides of the outer wall of the hanging block 102; The top of the membrane aerated biofilm reactor 27 is provided with a plurality of inverted "U"-shaped mounting rods 104 at equal intervals along its length direction. When the membrane aerated biofilm reactor 27 needs to be hoisted, the hoisting block 102 is first inserted between the two middle mounting rods 104, and then the hoisting rod 103 is inserted from the front end into the mounting rod 104 and connected to the mounting rod connecting hole 106 through the connecting mechanism 130. After the lifting mechanism 6 is lifted, the hoisting rod 103 and the mounting rod 104 are tightened to lift the membrane aerated biofilm reactor 27.

[0026] Furthermore, inclined lifting holes 107 are provided at the lower sides of the side walls of the lifting wire connection block 101. If an object whose center of gravity is not in the center needs to be lifted, the inclined lifting holes 107 can be used for lifting. A number of lifting rod connection holes 106 are mirrored and evenly spaced on the side walls of the lifting block 102. The lifting rod 103 can be installed on two mirrored lifting rod connection holes 106 of suitable width according to the width of the membrane aerated biofilm reactor 27 to be lifted, so that the lifting device can be suitable for membrane aerated biofilm reactors 27 of different sizes.

[0027] Furthermore, the hanging rod 103 is connected to the hanging rod connecting hole 106 by a connecting mechanism 130, and the connecting mechanism 130 includes a first limit block 131, a second limit block 132, a limit ring 133 and a limit hole 134, the first limit block 131 is a square structure arranged on the top rear side of the hanging rod 103, the second limit block 132 is a square structure arranged on the middle left side of the hanging rod 103, and the rear end of the second limit block 132 is connected to the front end of the first limit block 131. The distance between the two ends is greater than the thickness of the hanging block 102, the top of the hanging rod connecting hole 106 is the square hole 134 with the same cross-sectional shape as the first limit block 131 and the second limit block 132; the inner wall of the limit ring 133 is fixed to the outer wall of the hanging rod 103, and the distance between the rear end of the limit ring 133 and the front end of the second limit block 132 is equal to the thickness of the hanging block 102. When it is necessary to connect the hanging rod 103 to the hanging rod connecting hole 106, first connect the hanging rod 103 to the hanging rod. 03 is placed in front of the lifting block 102, the first limit block 131 is aligned and passed through the limit hole 134, and then the lifting rod 103 is rotated 90°. At this time, the second limit block 132 is aligned and passed through the limit hole 134. Finally, the lifting rod 103 is rotated 90°, and the front end face of the second limit block 132 and the rear end face of the limit ring 133 can complete the limit of the lifting block 102, and the installation of the lifting rod 103 is completed. Even if the lifting rod 103 rotates due to an accident during the working process, the second limit block 132 will not accidentally rotate. Passing through the limiting hole 134, the first limiting block 131 can also play a limiting role to ensure that the lifting rod 103 will not be separated from the lifting rod connecting hole 106; further, when the lifting mechanism 8 lifts the membrane aeration biofilm reactor 27, the upper surface of the lifting rod 103 is in tight contact with the lower surface of the installation rod 104, and can rotate, and the second limiting block 132 cannot rotate to the top of the installation rod 104, ensuring that the lifting rod 103 and the lifting rod connecting hole 106 will not be separated during work, and installation and disassembly are very simple.

[0028] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent transformations made using the contents of the present invention's specification and drawings or directly or indirectly applied in related technical fields are also included in the patent protection scope of the present invention.

Claims

1. A wetland water purification system based on micro-bubble aeration, characterized by: It includes a pre-treatment area (1), a U-shaped vertical flow purification area (2) and a rear overflow dam (3) which are arranged in sequence from front to back. The pretreatment area (1) comprises a pre-filter bed (11), a sedimentation tank (12) and a porous overflow dam (13), wherein the pre-filter bed (11) is arranged in front of the top of the soil foundation (9), the porous overflow dam (13) is arranged behind the pre-filter bed (11), the bottom of the porous overflow dam (13) is fixed to the bottom of the soil foundation (9), the sedimentation tank (12) is formed between the porous overflow dam (13) and the pre-filter bed (11), the sedimentation tank (12) is a square groove arranged on the top of the soil foundation (9), a plurality of overflow holes (14) for water to pass through are arranged above the outer wall of the porous overflow dam (13), a partition wall (4) is arranged between the porous overflow dam (13) and the rear overflow dam (3), and the outer wall bottom of the partition wall (4) is provided with a partition hole (41) for water to pass through; The U-shaped vertical flow purification area (2) comprises an aerobic area (21), an anaerobic area (22), a facultative aerobic area (23) and an enhanced reoxygenation area (24); the cavity surface and the cavity bottom between the partition wall (4) and the porous overflow weir (13) respectively form the aerobic area (21) and the anaerobic area (22); the cavity bottom and the cavity surface between the partition wall (4) and the rear overflow weir (3) respectively form the facultative aerobic area (23) and the enhanced reoxygenation area (24).

2. A wetland water purification system based on micro-bubble aeration according to claim 1, characterized in that: The aerobic area (21), the anaerobic area (22), and the facultative aerobic area (23) are evenly distributed with a plurality of elastic three-dimensional fillers (25); the enhanced reoxygenation area (24) is provided with a plurality of combined fillers (26) at intervals, and a membrane aeration biofilm reactor (27) capable of adjusting height is provided between the combined fillers (26).

3. A wetland water purification system based on micro-bubble aeration according to claim 2, characterized in that: A submersible pump (7) is fixed in the water behind the rear overflow dam (3); the input end of the submersible pump (7) is connected to the water behind the rear overflow dam (3); the output end of the submersible pump (7) is connected to the input end of a water delivery pipe (71); and the output end of the water delivery pipe (71) is connected to the interior of the pre-filter bed (11).

4. A wetland water purification system based on micro-bubble aeration according to claim 3, characterized in that: The output end of the submersible pump (7) is respectively connected to the water delivery pipe (71) and the input end of the wave-making aeration water pipe (5) through a three-way pipe; the output end of the wave-making aeration water pipe (5) is connected to the facultative aerobic area (23); the top end of the outer wall of the wave-making aeration water pipe (5) is connected to the bottom end of the air inlet pipe (6); and the top end of the air inlet pipe (6) is connected to the air above.

5. A wetland water purification system based on micro-bubble aeration according to claim 4, characterized in that: The membrane aeration biofilm reactor (27) is adjusted in height within the water body by means of a lifting mechanism (8); the lifting mechanism (8) comprises a bottom plate (81), a vertical pole (82), a support pole (83), a front plate (84), a rear plate (85), a side plate (86), a driving shaft (87), a rotating rod (88), a driving gear (89), a driven shaft (90) and a driven gear (91); the bottom plate (81) is fixed to the ground at the shore, the vertical pole (82) is fixed to the ground at the shore, and the vertical pole (82) is fixed to the ground at the shore. ) is connected to the top of the bottom plate (81), the vertical rod (82) is a hollow square structure, and a hinge shaft (92) is provided between the tops of the front and rear walls thereof for being hinged to the upper right side walls of the front plate (84) and the rear plate (85), the side plate (86) is connected to the side walls of the front plate (84) and the rear plate (85) to form a mounting shell with a hollow structure, the driving shaft (87) is provided between the lower right side walls of the front plate (84) and the rear plate (85), and the driving shaft ( The front end of the support rod (87) passes through the front plate (84) and is connected to one end of the rotating rod (88); the driving gear (89) is sleeved on the rear side of the driving shaft (87); the driven shaft (90) is provided between the middle parts of the side walls of the front plate (84) and the rear plate (85); the driven gear (91) is sleeved on the rear side of the driven shaft (90) and is matched and meshed with the driving gear (89); the support rod (83) is a square structure with a hollow center and two open ends, and its right side is provided with a plurality of support rods (83); A fixed pulley is installed at the end opening; the front and rear walls of the left end of the support rod (83) are fixedly connected to the upper right inner walls of the front plate (84) and the rear plate (85) respectively; a suspension wire (93) is wound around the outside of the driven shaft (90); one end of the suspension wire (93) passes through the inner cavity of the support rod (83) and the fixed pulley and is connected to the suspension mechanism (100); a limiting mechanism (110) for limiting the rotation of the installation shell and the support rod (83) is provided inside the installation shell.

6. A wetland water purification system based on micro-bubble aeration according to claim 5, characterized in that: A locking mechanism (120) is provided inside the mounting shell, and the locking mechanism (120) comprises a rotating shaft (121), a pawl (122), a ratchet (123), a torsion spring (124) and an unlocking block (125); two ends of the rotating shaft (121) respectively pass through the lower left side walls of the front plate (84) and the rear plate (85); a pawl hole for connecting to the outer wall of the rotating shaft (121) is provided at the left end of the pawl (122); the right end of the pawl (122) is in a hook-shaped structure; the ratchet (123) is in a hook-shaped structure; Axially fixed to the front side of the driving shaft (87), the hook-shaped structure at the right end of the pawl (122) is matched and engaged; the torsion spring (124) is sleeved on the outside of the rotating shaft (121) between the pawl (122) and the front plate (84), one end of the torsion spring (124) is connected to the middle part of the front wall of the pawl (122), and the other end of the torsion spring (124) is connected to the rear wall of the front plate (84); the outer end of the rotating shaft (121) passes through the front plate (84) and is connected to the unlocking block (125).

7. A wetland water purification system based on micro-bubble aeration according to claim 6, characterized in that: The limiting mechanism (110) comprises a limiting arm (111), a hook-shaped portion (112), a lever (113), a lever hole (114), a square hole (115) and a clamping rod (116); the limiting arm hole for being sleeved on the rear side of the outer wall of the rotating shaft (121) is provided at the left end of the limiting arm (111); the hook-shaped portion (112) bent downward is formed at the right end of the limiting arm (111); the lever (113) is provided at the middle of the outer wall of the limiting arm (111); the front plate (84) The lever hole (114) for the lever (113) to slide is provided on the lever, the length of the lever hole (114) is greater than the outer diameter of the clamping rod (116), and the lever hole (114) is an arc-shaped structure with the rotating shaft (121) as the center; the square hole (115) for the hook-shaped portion (112) to pass through is provided on the upper side wall of the left side of the vertical rod (82), and the clamping rod (116) for matching and clamping with the hook-shaped portion (112) is provided at the bottom of the square hole (115).

8. A wetland water purification system based on micro-bubble aeration according to claim 7, characterized in that: The hanging mechanism (100) comprises a hanging wire connection block (101), a hanging block (102), a hanging rod (103) and a mounting rod (104); the hanging wire connection block (101) is roughly in the form of an isosceles triangle structure, and a hanging wire hole (105) for connecting to the bottom end of the hanging wire (93) is provided in the middle of the upper part of its outer wall; the hanging block (102) is in the form of a square structure, and a top middle part is connected to the bottom end of the hanging wire connection block (101); hanging rod connection holes (106) for connecting to the hanging rod (103) are provided on both sides of the outer wall of the hanging block (102); and a plurality of inverted "U"-shaped mounting rods (104) are provided at equal intervals on the top of the membrane aeration biofilm reactor (27) along its length.

9. A wetland water purification system based on micro-bubble aeration according to claim 8, characterized in that: Inclined lifting holes (107) are provided at the lower sides of the side walls of the lifting wire connection block (101); and a plurality of lifting rod connection holes (106) are mirror-imaged and arranged at equal intervals on the side walls of the lifting block (102).

10. A wetland water purification system based on micro-bubble aeration according to claim 9, characterized in that: The hoisting rod (103) is connected to the hoisting rod connecting hole (106) via a connecting mechanism (130), the connecting mechanism (130) comprising a first limit block (131), a second limit block (132), a limit ring (133) and a limit hole (134), the first limit block (131) being in a square structure and arranged at the top rear side of the hoisting rod (103), the second limit block (132) being in a square structure and arranged at the middle left side of the hoisting rod (103), the second limit block (132) being in a square structure and arranged at the middle left side of the hoisting rod (103), The distance between the rear end of the first limit block (131) and the front end of the first limit block (131) is greater than the thickness of the hanging block (102); the top of the hanging rod connecting hole (106) is the square hole (134) with the same cross-sectional shape as the first limit block (131) and the second limit block (132); the inner wall of the limit ring (133) is fixed to the outer wall of the hanging rod (103); the distance between the rear end of the limit ring (133) and the front end of the second limit block (132) is equal to the thickness of the hanging block (102).

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