A wetland water purification system based on micro-bubble aeration
The wetland water purification system, which combines microbubble aeration technology with MABR, solves the problems of long purification cycles, high costs, and low efficiency of existing wetland water purification systems, and achieves efficient and low-cost pollutant treatment and enhanced microbial diversity.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- JIANGXI ACAD OF FORESTRY
- Filing Date
- 2024-11-27
- Publication Date
- 2026-06-05
Smart Images
Figure CN119263559B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of water treatment technology, and in particular to a wetland water purification system based on microbubble aeration. Background Technology
[0002] Existing wetland water purification systems often employ the construction of filtration ponds, relying on natural sedimentation to achieve water purification. This process results in a long purification cycle, low purification quality, and high ongoing operation and maintenance costs for the filtration ponds, hindering cost reduction and efficiency improvement in the engineering construction process. Current pre-treatment systems for low-pollution rural wastewater or urban polluted water flowing into ponds or rivers are mostly intermittent, requiring water retention, which increases management costs. Furthermore, these systems suffer from low microbial activity and diversity, long acclimatization times, low treatment efficiency, and large land area requirements. Summary of the Invention
[0003] The purpose of this invention is to overcome the shortcomings of existing technologies and provide a wetland water purification system based on microbubble aeration. Water flows through a pretreatment zone for initial pollutant removal, and then through a U-shaped vertical flow purification zone to further enhance pollutant removal. In the downstream section of the U-shaped vertical flow purification zone, elastic three-dimensional packing material is suspended as a microbial carrier, adding an anaerobic stage to the main anaerobic zone and improving the total nitrogen removal rate. In the upstream section, combined packing material is suspended as a microbial carrier, and simultaneously, membrane aeration biofilm reactors with controllable height are arranged at intervals. This combined technology increases the oxygen content of the water in the area, promotes the establishment of the nitrification system, and increases the treatment load. The height of the membrane aeration biofilm reactors is controllable, and the aeration power of the hollow fiber membranes is adjustable.
[0004] To achieve the objectives of this invention, the technical solution adopted is as follows:
[0005] This invention discloses a wetland water purification system based on microbubble aeration. The system is characterized by comprising a pretreatment zone, a U-shaped vertical flow purification zone, and a rear overflow dam arranged sequentially from front to back. The pretreatment zone includes a pre-filter, a sedimentation tank, and a porous overflow dam. The pre-filter is positioned in front of the top of the soil foundation, and the porous overflow dam is positioned behind the pre-filter. 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. The square groove at the top of the soil foundation; the upper part of the outer wall of the porous overflow dam is provided with several overflow holes for water flow; a partition wall is provided between the porous overflow dam and the rear overflow dam; the bottom of the outer wall of the partition wall is provided with partition holes for water flow; the U-shaped vertical flow purification zone includes an aerobic zone, an anaerobic zone, a facultative aerobic zone, and an enhanced reoxygenation zone; the aerobic zone and the anaerobic zone are respectively formed on the surface of the cavity between the partition wall and the porous overflow dam; the facultative aerobic zone and the enhanced reoxygenation zone are respectively formed on the surface of the cavity between the partition wall and the rear overflow dam.
[0006] The aerobic zone, anaerobic zone, and facultative aerobic zone are uniformly distributed with several elastic three-dimensional packing materials; the enhanced reoxygenation zone is provided with several combined packing materials at intervals, and the combined packing materials are provided with a membrane aeration biofilm reactor with adjustable height.
[0007] 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 supply pipe, and the output end of the water supply pipe is connected to the interior of the pre-filter bed.
[0008] The output end of the submersible pump is connected to the input end of the water supply pipe and 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. The top of the air inlet pipe is connected to the air above.
[0009] The membrane aerated biofilm reactor uses a lifting mechanism to adjust the height of both components within the water body. This lifting mechanism includes a base plate, uprights, support rods, a front plate, a rear plate, side plates, a drive shaft, a rotating rod, a drive gear, a driven shaft, and a driven gear. The base plate is fixed to the ground on the bank. The bottom end of the uprights is connected to the top of the base plate. The uprights have a hollow square structure, with a hinge shaft between the top ends of their front and rear walls for hinged connection to the upper right side walls of the front and rear plates. The side plates are connected to the side walls of the front and rear plates to form a hollow mounting shell. The drive shaft is located between the lower right side walls of the front and rear plates, with its front end passing through the front plate. One end of the rotating rod is connected to the drive gear; the drive gear is sleeved on the rear side of the drive shaft; the driven shaft is provided between the middle 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 drive gear; the support rod has a hollow square structure with openings at both ends, and a fixed pulley is installed at the opening at its right end; the front and rear walls of the left end of the support rod are fixedly connected to the upper right of the inner walls of the front plate and the rear plate, respectively; a suspension line is wound around the outside of the driven shaft, and one end of the suspension line passes through the inner cavity of the support rod and the fixed pulley and is connected to the hoisting mechanism; the interior of the mounting shell is provided with a limiting mechanism for restricting the rotation of the mounting shell and the support rod.
[0010] The mounting housing is equipped with a locking mechanism, which includes a rotating shaft, a pawl, a ratchet, a torsion spring, and an unlocking block. The two ends of the rotating shaft pass through the lower left side walls of the front and rear plates, respectively. The left end of the pawl has a pawl hole for connecting with the outer wall of the rotating shaft, and the right end of the pawl has a hook-shaped structure. The ratchet is axially fixed to the front side of the drive shaft, and the hook-shaped structure at the right end of the pawl engages with it. The torsion spring is fitted outside the rotating shaft between the pawl and the front plate. One end of the torsion spring is connected to the middle 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.
[0011] The limiting mechanism includes a limiting arm, a hook-shaped part, a lever, a lever hole, a square hole, and a locking rod. The left end of the limiting arm has a limiting arm hole for fitting onto the rear side of the outer wall of the rotating shaft. The right end of the limiting arm forms the hook-shaped part that bends downward. The lever is located in the middle of the outer wall of the limiting arm. The front plate has a lever hole for sliding the lever. The length of the lever hole is greater than the outer diameter of the locking rod. The lever hole is an arc-shaped structure with the rotating shaft as the center. The upper left side wall of the upright has a square hole for the hook-shaped part to pass through. The bottom of the square hole has a locking rod for matching and engaging with the hook-shaped part.
[0012] The hoisting mechanism includes a hoisting wire connecting block, a hoisting block, a hoisting rod, and an installation rod. The hoisting wire connecting block is approximately an isosceles triangle with a hoisting wire hole at the top center of its outer wall for connecting to the bottom end of the hoisting wire. The hoisting block is square with its top center connected to the bottom end of the hoisting wire connecting block. The outer walls of the hoisting block have hoisting rod connecting holes on both sides for connecting to the hoisting rod. The top of the membrane aeration biofilm reactor has several inverted "U"-shaped installation rods evenly spaced along its length.
[0013] The lower sides of the sidewall of the suspension line connecting block are provided with inclined lifting holes; the sidewall of the lifting block is provided with a plurality of lifting rod connecting holes at equal intervals.
[0014] The lifting rod is connected to the lifting rod connecting hole via a connecting mechanism. The connecting mechanism includes a first limiting block, a second limiting block, a limiting ring, and a limiting hole. The first limiting block is square and located on the top rear side of the lifting rod. The second limiting block is square and located on the middle left side of the lifting rod. The distance between the rear end of the second limiting block and the front end of the first limiting block is greater than the thickness of the lifting block. The top of the lifting rod connecting hole is a square hole with the same cross-sectional shape as the first and second limiting blocks. The inner wall of the limiting ring is fixed to the outer wall of the lifting rod. The distance between the rear end of the limiting ring and the front end of the second limiting block is equal to the thickness of the lifting block.
[0015] The beneficial effects of this invention are as follows:
[0016] (1) In this invention, the water flows through the pretreatment area to remove preliminary pollutants, and the water flows through the U-shaped vertical flow purification area to improve the removal of pollutants. The downstream area of the water flow in the U-shaped vertical flow purification area is suspended with elastic three-dimensional packing as a microbial carrier, which adds an anaerobic link to the main anaerobic area and improves the total nitrogen removal rate. The upstream area of the water flow is suspended with combined packing as a microbial carrier, and at the same time, membrane aerated biofilm reactors (MABR) with controllable height are arranged at intervals. Combined with (MABR) technology, the oxygen content of the water in the area is increased, the nitrification system is established, and the treatment load is increased. The height of the membrane aerated biofilm reactor can be controlled, 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 pollutant adhesion and reduce clogging. The intermittent mixed packing reduces the construction cost and further improves the oxygen utilization rate of the aerobic area.
[0017] (2) By setting a submersible pump, the water behind the overflow dam is pumped into the pre-filter bed, which can improve the water circulation capacity, enhance the self-purification capacity of the water when the water level is insufficient, and pump the microorganisms in the water behind to the sedimentation tank to improve the diversity of microorganisms. Attached Figure Description
[0018] Figure 1 This is a schematic diagram of the structure of the present invention;
[0019] Figure 2 This is a top view diagram of the present invention;
[0020] Figure 3 This is a schematic diagram of the lifting mechanism in this invention;
[0021] Figure 4 This is a schematic diagram of the mounting shell structure in this invention;
[0022] Figure 5 This is a schematic diagram of the internal structure of the mounting shell in this invention;
[0023] Figure 6 This is a cross-sectional schematic diagram of the limiting mechanism in this invention;
[0024] Figure 7 This is an exploded view of the hoisting mechanism and the connecting mechanism in this invention;
[0025] Figure 8 for Figure 7 The main view.
[0026] In the diagram: 1. Pretreatment area; 11. Pre-filter bed; 12. Sedimentation tank; 13. Porous overflow dam; 14. Overflow hole; 2. U-shaped vertical flow purification area; 21. Aerobic area; 22. Anaerobic area; 23. Facultative aerobic area; 24. Enhanced reoxygenation area; 25. Elastic three-dimensional packing; 26. Combined packing; 27. Membrane aeration biofilm reactor; 3. Post-overflow dam; 4. Partition wall; 5. Wave-generating aeration water pipe; 6. Air inlet pipe; 7. Submersible pump; 8. Lifting mechanism; 9. Soil base; 81. Base plate; 82. Upright pole; 83. Support rod; 84. Front plate; 85. Rear plate; 86. Side plate; 87. Drive shaft; 88. Rotating rod; 89. Drive gear; 90. Driven shaft; 91. Driven shaft. Gear, 92 hinge shaft, 93 suspension line, 100 lifting mechanism, 101 suspension line connecting block, 102 lifting block, 103 lifting rod, 104 mounting rod, 105 suspension line hole, 106 lifting rod connecting hole, 107 inclined lifting hole, 110 limiting mechanism, 111 limiting arm, 112 hook-shaped part, 113 lever, 114 lever hole, 115 square hole, 116 snap-fit 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 Implementation
[0027] The present invention will be further described below:
[0028] Please see Figure 1-8 ,
[0029] This invention discloses a wetland water purification system based on microbubble aeration, comprising a pretreatment zone 1, a U-shaped vertical flow purification zone 2, and a rear overflow dam 3 arranged sequentially from front to back. The pretreatment zone 1 includes a pre-filter 11, a sedimentation tank 12, and a porous overflow dam 13. The pre-filter 11 is located in front of the top of a soil base 9, and the porous overflow dam 13 is located behind the pre-filter 11. The bottom of the porous overflow dam 13 is fixed to the bottom of the soil base 9. The sedimentation tank 12 is formed between the porous overflow dam 13 and the pre-filter 11. The sedimentation tank 12 is a square groove located on the top of the soil base 9. The pre-filter 11 and the sedimentation tank 12 are L-shaped grooves excavated on the top of the soil base 9, instead of completely excavating the soil base 11 to the bottom. This reduces costs without affecting the performance. The porous overflow dam 1... The outer wall of the overflow dam 3 has several overflow holes 14 for water flow. A partition wall 4 is provided between the porous overflow dam 13 and the rear overflow dam 3. The bottom of the outer wall of the partition wall 4 has partition holes 41 for water flow. The U-shaped vertical flow purification zone 2 includes an aerobic zone 21, an anaerobic zone 22, a facultative aerobic zone 23, and a reinforced reoxygenation zone 24. The aerobic zone 21 and the anaerobic zone 22 are formed on the surface of the cavity between the partition wall 4 and the porous overflow dam 13, respectively. The facultative aerobic zone 23 and the reinforced reoxygenation zone 24 are formed on the surface of the cavity between the partition wall 4 and the rear overflow dam 3, respectively. Water flows through the pretreatment zone 1 for preliminary pollutant removal. Water flows through the U-shaped vertical flow purification zone 2 to enhance pollutant removal. The first half of the U-shaped vertical flow is downward water flow, and the second half is upward water flow. There is no aeration equipment at the bottom of the anaerobic zone 22, so the dissolved oxygen in the water decreases as you go down, forming an anaerobic environment. As the water flows upwards, the membrane aeration biofilm reactor 27 provides a large amount of oxygen to the water, accelerating the reoxygenation efficiency and forming an aerobic-anaerobic-aerobic water flow, which improves the biochemical effect and removal efficiency of various pollutants. Existing pretreatment systems for rural low-pollution wastewater or urban polluted water entering ponds or rivers are mostly intermittent, requiring water retention for treatment, which increases the management cost of the system. This invention is a continuous circulation treatment mode, which provides continuous treatment, is more in line with the natural occurrence pattern, and reduces management costs.
[0030] Furthermore, several elastic three-dimensional packing materials 25 are evenly distributed in the aerobic zone 21, anaerobic zone 22, and facultative aerobic zone 23; several combined packing materials 26 are spaced apart in the enhanced reoxygenation zone 24, and membrane aeration biofilm reactors 27 with adjustable height are arranged between the combined packing materials 26. The elastic three-dimensional packing materials 25 are suspended in the downstream area of the U-shaped vertical flow purification zone 2 as microbial carriers, adding an anaerobic link to the main anaerobic zone 22 and improving the total nitrogen removal rate; the combined packing materials 26 are suspended in the upstream area of the water flow as microbial carriers, and membrane aeration biofilm reactors 27 (MABR) with adjustable height are arranged at intervals. Combined with MABR technology, the oxygen content of the regional water is increased, the nitrification system is established, and the treatment load is increased. The height of the membrane aeration biofilm reactor 27 is controllable, and the aeration power of the hollow fiber membrane is adjustable. 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 increasing the rate of nitrification. The low dissolved oxygen concentration and abundant organic matter on the outer side of the biofilm provide a favorable anaerobic environment and sufficient carbon source for anaerobic denitrifying bacteria, greatly increasing the rate of denitrification. Nitrification and denitrification can occur within the same biofilm, enabling simultaneous nitrification and denitrification. MABR membrane materials are mainly divided into three categories: hydrophobic microporous membranes such as polypropylene and polytetrafluoroethylene, dense membranes such as silicone resin, and composite membranes with very thin functional layers. MABR aeration membranes are mainly divided into two categories: microporous membranes such as polypropylene and polytetrafluoroethylene membranes, and dense membranes (such as silicone rubber membranes). Both types of membranes can supply oxygen in the form of bubble-free aeration, theoretically achieving 100% oxygen utilization. During operation, the aeration rate is adjusted by regulating the aeration pressure. The main advantages of using bubble-free aeration are: ① High oxygen utilization and reduced energy consumption. Compared with traditional biofilm methods, bubble-free aeration reduces the mass transfer resistance of the liquid film to oxygen. Furthermore, because oxygen diffuses directly into the water in molecular form rather than as bubbles during bubble-free aeration, 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 methods, greatly improving oxygen utilization and reducing energy consumption. ② Less loss of volatile pollutants during airlift, avoiding secondary pollution. Bubble-free aeration produces bubbles with surface tension, making it easy for some volatile pollutants in the water to adhere to the bubbles and rise with them into the aeration environment, polluting the environment. Bubble-free aeration avoids this loss of volatile pollutants during airlift, making it more environmentally friendly than bubble-free aeration. ③ Less biofilm detachment. Bubble-free aeration reduces the friction of bubbles on the biofilm growing on the carrier, allowing the biofilm to adhere more firmly to the carrier and preventing detachment.④ When designing the reactor, the gas phase and liquid phase can be considered separately. During the MABR non-foaming aeration process, the gas phase and liquid phase are separated, and the mixing of oxygen supply and solution does not affect each other. The membrane aerated bioreactor 27 can adjust its 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 bioreactor 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 reoxygenation zone depth, improve pollutant removal efficiency, and reduce operating costs.
[0031] Furthermore, 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, and the output end of the submersible pump 7 is connected to the input end of the water supply pipe 71. The output end of the water supply pipe 71 is connected to the interior of the pre-filter bed 11. By setting the submersible pump 7 to pump the water behind the rear overflow dam 3 into the pre-filter bed 11, the water circulation capacity can be improved. When the water level is insufficient, the self-purification capacity of the water can be enhanced. Microorganisms in the water behind the overflow dam can be pumped to the pre-filter bed 11 to improve the diversity of microorganisms. The submersible pump 7 has a low failure rate. By fixing the submersible pump 7 in the water, it can be ensured that the submersible pump 7 will not enter the silt at the bottom of the water, thus extending its service life.
[0032] Furthermore, the output end of the submersible pump 7 is connected to the water supply pipe 71 and the input end of the wave-making aeration water pipe 5 via a three-way pipe. The output end of the wave-making aeration water pipe 5 is connected to the facultative aerobic zone 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. The submersible pump 7 pumps microbubble water into the facultative aerobic zone 23, providing oxygen while accelerating the diversity and reproduction of microbial populations. By connecting the air inlet pipe 6 to the top of the wave-making aeration water pipe 5, the oxygen supply can be further increased. When the submersible pump 7 pumps microbubble water into the facultative aerobic zone 23, a negative pressure is formed at the bottom of the air inlet pipe 6, which allows the air at the top of the air inlet pipe 6 to be forced into the wave-making aeration water pipe 5.
[0033] Furthermore, the membrane aerated biofilm reactor 27 adjusts its height in the water body via a lifting mechanism 8. The lifting mechanism 8 includes a base plate 81, uprights 82, support rods 83, a front plate 84, a rear plate 85, side plates 86, a drive shaft 87, a rotating rod 88, a drive gear 89, a driven shaft 90, and a driven gear 91. The base plate 81 is fixed to the ground on the bank. The bottom end of the uprights 82 is connected to the top of the base plate 81. The uprights 82 have a hollow square structure, and a mechanism is provided between the tops of its front and rear walls for... A hinge shaft 92 is hinged to the upper right side wall 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 hollow mounting shell. The drive shaft 87 is located between the lower right side walls of the front plate 84 and the rear plate 85. The front end of the drive shaft 87 passes through the front plate 84 and is connected to one end of the rotating rod 88. The drive gear 89 is sleeved on the rear side of the drive shaft 87. The driven shaft 90 is located between the middle of the side walls of the front plate 84 and the rear plate 85. Driven gear 91 is sleeved on the rear side of driven shaft 90 and meshes with drive gear 89; support rod 83 has a hollow square structure with openings at both ends, and a fixed pulley is installed at its right end opening. The front and rear walls of the left end of support rod 83 are fixedly connected to the upper right of the inner walls of front plate 84 and rear plate 85, respectively. A suspension wire 93 is wound around the outside of driven shaft 90, and one end of the suspension wire 93 passes through the inner cavity of support rod 83 and the fixed pulley and is connected to lifting mechanism 100; the interior of the mounting housing is provided with a... The limiting mechanism 110, which restricts the rotation of the mounting shell and support rod 83, can adjust the height of the membrane aeration biofilm reactor 27 through the lifting mechanism 6. Specifically, when it is necessary to raise the height of the membrane aeration biofilm reactor 27, rotating the rotating rod 88 clockwise drives the drive shaft 87 and the drive gear 89 to rotate clockwise, which in turn drives the driven gear 91 and the driven shaft 90 to rotate clockwise. The suspension line 93 wound on the driven shaft 90 gradually tightens, thereby raising the height of the membrane aeration biofilm reactor 27; the reverse is also true.
[0034] Furthermore, the mounting housing is equipped with a locking mechanism 120, which 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 sidewalls of the front plate 84 and the rear plate 85, respectively. The left end of the pawl 122 has a pawl hole for connecting to the outer wall of the rotating shaft 121, and the right end of the pawl 122 has a hook-shaped structure. The ratchet 123 is axially fixed to the drive shaft 87. On the front side, the hook-shaped structure at the right end of the pawl 122 engages; the torsion spring 124 is externally fitted onto 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 it is necessary to raise the height of the membrane aeration biofilm reactor 27, the user rotates the rotating rod 88 clockwise, which drives the drive shaft 87 and the ratchet 123 to rotate clockwise. When the left arm surface of wheel 123 contacts the right wall of the hook-shaped structure at the right end of pawl 122, it can press the right end of pawl 122 downward. At this time, torsion spring 124 is in a compressed state. After the hook-shaped structure passes one tooth of ratchet 123, it moves upward due to the reset action of torsion spring 124. The left end of the hook-shaped structure can engage with the right end of the tooth of ratchet 123, ensuring that after rising to the appropriate position and the rotating rod 88 stops rotating, it will not rotate counterclockwise, thus enabling the membrane aeration biofilm reactor 27 to... The height is locked; when it is necessary to lower the height of the membrane aeration biofilm reactor 27, first rotate the unlocking block 125 clockwise, which will drive the rotating shaft 121 and the pawl 122 to rotate clockwise, so that the hook-shaped structure of the pawl 122 will no longer be engaged with the teeth of the ratchet 123. Then, slowly rotate the rotating rod 88 counterclockwise to lower the height of the membrane aeration biofilm reactor 27 to a suitable position. Then, release the unlocking block 125 to re-engage the pawl 122 with the ratchet 123.
[0035] Furthermore, the limiting mechanism 110 includes a limiting arm 111, a hook-shaped part 112, a lever 113, a lever hole 114, a square hole 115, and a locking rod 116. The left end of the limiting arm 111 is provided with a limiting arm hole for fitting onto the rear side of the outer wall of the rotating shaft 121. The right end of the limiting arm 111 forms the hook-shaped part 112 that bends downward. The lever 113 is provided in the middle of the outer wall of the limiting arm 111. The front plate 84 is provided with a lever hole 114 for sliding the lever 113. The length of the lever hole 114 is greater than the outer diameter of the locking rod 116. The lever hole 114 is an arc-shaped structure with the rotating shaft 121 as the center. The upper left side wall of the upright rod 82 is provided with a square hole 115 for the hook-shaped part 112 to pass through. The bottom of the square hole 115 is provided for engaging with the hook-shaped part 112. The locking rod 116, with its locking mechanism 11, ensures that the support rod 83 will not rotate during operation. When the lifting mechanism 6 needs to be moved or stored, the locking mechanism 11 can be unlocked to rotate the support rod 83 to a state parallel to the upright 82 for easy handling and storage. Specifically, when the lifting mechanism 6 is working, the hook-shaped part 112 at the right end of the locking arm 111 passes through the square hole 115 on the left side wall of the upright 82 and engages with the locking rod 116, thus limiting the support rod 83 and ensuring that it will not rotate during operation. When the lifting mechanism 6 needs to be moved or stored, the user moves the lever 113 upward along the lever hole 114. The lever 113 drives the hook-shaped part 112 to rotate counterclockwise and disengage from the locking rod 116. At this time, the support rod 83 can be rotated clockwise to a state parallel to the upright 82.
[0036] Furthermore, the hoisting mechanism 100 includes a hoisting wire connecting block 101, a hoisting block 102, a hoisting rod 103, and a mounting rod 104. The hoisting wire connecting block 101 is approximately an isosceles triangle, with a hoisting wire hole 105 at the upper center of its outer wall for connecting to the bottom end of the hoisting wire 93. The hoisting block 102 is square, with its top center connected to the bottom end of the hoisting wire connecting block 101. Both sides of the outer wall of the hoisting block 102 have hoisting rod connecting holes 106 for connecting to the hoisting rod 103. The top of the membrane aerated biofilm reactor 27 is provided with several inverted "U"-shaped mounting rods 104 at equal intervals along its length. When it is necessary to hoist the membrane aerated biofilm reactor 27, firstly, the hoisting block 102 is 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 connection hole 106 through the connecting mechanism 130. After the lifting mechanism 6 lifts it, the hoisting rod 103 and the mounting rod 104 are tensioned to raise and lower the membrane aerated biofilm reactor 27.
[0037] Furthermore, inclined lifting holes 107 are provided on the lower sides of both sides of the side wall of the lifting line connecting block 101. If it is necessary to lift an object whose center of gravity is not in the center, the inclined lifting holes 107 can be used for lifting. Several lifting rod connecting holes 106 are provided at equal intervals on the side wall of the lifting block 102. The lifting rod 103 can be installed on two mirrored lifting rod connecting 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.
[0038] Furthermore, the lifting rod 103 is connected to the lifting rod connecting hole 106 via a connecting mechanism 130. The connecting mechanism 130 includes a first limiting block 131, a second limiting block 132, a limiting ring 133, and a limiting hole 134. The first limiting block 131 is square in shape and is disposed on the top rear side of the lifting rod 103. The second limiting block 132 is square in shape and is disposed on the middle left side of the lifting rod 103. The rear end of the second limiting block 132 is connected to the front end of the first limiting block 131. The distance between them is greater than the thickness of the lifting block 102. The top of the lifting rod connecting hole 106 is the same as the square hole 134 with the same cross-sectional shape as the first limiting block 131 and the second limiting block 132. The inner wall of the limiting ring 133 is fixed to the outer wall of the lifting rod 103. The distance between the rear end of the limiting ring 133 and the front end of the second limiting block 132 is equal to the thickness of the lifting block 102. When it is necessary to connect the lifting rod 103 to the lifting rod connecting hole 106, the lifting rod 103 is first connected to the lifting rod connecting hole 102. 03. Place the first limiting block 131 in front of the lifting block 102, align the first limiting block 131 and pass it through the limiting hole 134, then rotate the lifting rod 103 90°. At this time, the second limiting block 132 is aligned and passes through the limiting hole 134. Finally, rotate the lifting rod 103 90°, and the front end face of the second limiting block 132 and the rear end face of the limiting ring 133 can limit the lifting block 102, completing the installation of the lifting rod 103. Even if the lifting rod 103 rotates due to an accident during the operation, the second limiting block 132 will not be accidentally rotated. Passing through the limiting hole 134, the first limiting block 131 also serves as a limiting device, ensuring that the lifting rod 103 will not detach from the lifting rod connection hole 106; furthermore, when the lifting mechanism 8 lifts the membrane aerated biofilm reactor 27, the upper surface of the lifting rod 103 comes into tight contact with the lower surface of the mounting rod 104, allowing rotation to occur, and the second limiting block 132 will not be able to rotate to the top of the mounting rod 104, ensuring that the lifting rod 103 and the lifting rod connection hole 106 will not detach during operation, and that installation and disassembly are very simple.
[0039] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent modifications made based on the content of the present invention specification and drawings, or direct or indirect applications in related technical fields, are similarly included within the patent protection scope of the present invention.
Claims
1. A wetland water purification system based on microbubble aeration, characterized in that: It includes a pretreatment area (1), a U-shaped vertical flow purification area (2), and a rear overflow dam (3) arranged sequentially from front to back. The pretreatment area (1) includes a pre-filter (11), a sedimentation tank (12), and a porous overflow dam (13). The pre-filter (11) is located in front of the top of the soil foundation (9), and the porous overflow dam (13) is located behind the pre-filter (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 (11). The sedimentation tank (12) is a square groove located on the top of the soil foundation (9). Several overflow holes (14) for water flow are provided on the upper part of the outer wall of the porous overflow dam (13). A partition wall (4) is provided between the porous overflow dam (13) and the rear overflow dam (3). A partition hole (41) for water flow is provided at the bottom of the outer wall of the partition wall (4). The U-shaped vertical flow purification zone (2) includes an aerobic zone (21), an anaerobic zone (22), a facultative aerobic zone (23), and an enhanced reoxygenation zone (24). The aerobic zone (21) and the anaerobic zone (22) are formed on the surface of the cavity between the partition wall (4) and the porous overflow dam (13), respectively. The facultative aerobic zone (23) and the enhanced reoxygenation zone (24) are formed on the surface of the cavity between the partition wall (4) and the rear overflow dam (3), respectively.
2. The wetland water purification system based on microbubble aeration according to claim 1, characterized in that: The aerobic zone (21), anaerobic zone (22), and facultative aerobic zone (23) are evenly distributed with several elastic three-dimensional packing materials (25); the enhanced reoxygenation zone (24) is provided with several combined packing materials (26) at intervals, and the combined packing materials (26) are provided with membrane aeration biofilm reactors (27) with adjustable height.
3. The wetland water purification system based on microbubble 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 body behind the rear overflow dam (3). The output end of the submersible pump (7) is connected to the input end of the water supply pipe (71). The output end of the water supply pipe (71) is connected to the interior of the pre-filter bed (11).
4. A wetland water purification system based on microbubble aeration according to claim 3, characterized in that: The output end of the submersible pump (7) is connected to the water supply pipe (71) and the input end of the wave-making aeration water pipe (5) respectively 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.
5. A wetland water purification system based on microbubble aeration according to claim 4, characterized in that: The membrane aerated biofilm reactor (27) is adjusted in height within the water body via a lifting mechanism (8); the lifting mechanism (8) includes a base plate (81), uprights (82), support rods (83), a front plate (84), a rear plate (85), a side plate (86), a drive shaft (87), a rotating rod (88), a drive gear (89), a driven shaft (90), and a driven gear (91). The base plate (81) is fixed to the ground on the bank, and the uprights (82)... The bottom end of the pole (82) is connected to the top of the base plate (81). The pole (82) has a hollow square structure. A hinge shaft (92) is provided between the top ends of its front and rear walls for hinged connection with the upper right side wall 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 hollow mounting shell. The drive shaft (87) is located between the lower right side wall of the front plate (84) and the rear plate (85). The front end of the drive shaft (87) passes through the front plate (84) and is connected to one end of the rotating rod (88); the drive gear (89) is sleeved on the rear side of the drive shaft (87); the driven shaft (90) is provided between the middle of the side walls of the front plate (84) and the rear plate (85), and the driven gear (91) is sleeved on the rear side of the driven shaft (90) and meshes with the drive gear (89); the support rod (83) has a hollow square structure with openings at both ends, and its right... A fixed pulley is installed at the end opening. The left end front and rear walls of the support rod (83) are fixedly connected to the upper right of the inner walls of the front plate (84) and the rear plate (85), respectively. A suspension line (93) is wound around the outside of the driven shaft (90). One end of the suspension line (93) passes through the inner cavity of the support rod (83) and the fixed pulley and is connected to the hoisting mechanism (100). The interior of the mounting shell is provided with a limiting mechanism (110) for limiting the rotation of the mounting shell and the support rod (83).
6. A wetland water purification system based on microbubble aeration according to claim 5, characterized in that: The mounting housing is equipped with a locking mechanism (120), which 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 sidewalls of the front plate (84) and the rear plate (85), respectively. The left end of the pawl (122) has a pawl hole for connecting to the outer wall of the rotating shaft (121), and the right end of the pawl (122) has a hook-shaped structure. The ratchet (123)... The pawl (122) is axially fixed to the front side of the drive shaft (87), and the hook-shaped structure at the right end of the pawl (122) is matched and engaged; the torsion spring (124) is fitted 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); 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 microbubble aeration according to claim 6, characterized in that: The limiting mechanism (110) includes a limiting arm (111), a hook-shaped part (112), a lever (113), a lever hole (114), a square hole (115), and a locking rod (116). The left end of the limiting arm (111) is provided with a limiting arm hole for fitting onto the rear side of the outer wall of the rotating shaft (121). The right end of the limiting arm (111) forms the hook-shaped part (112) that bends downward. The lever (113) is provided in the middle of the outer wall of the limiting arm (111). The front plate (84) The rod (82) is provided with a lever hole (114) for sliding the lever (113). The length of the lever hole (114) is greater than the outer diameter of the locking rod (116). The lever hole (114) is an arc-shaped structure with the rotating shaft (121) as the center. The upper left side wall of the upright rod (82) is provided with a square hole (115) for the hook-shaped part (112) to pass through. The bottom of the square hole (115) is provided with a locking rod (116) for matching and locking with the hook-shaped part (112).
8. A wetland water purification system based on microbubble aeration according to claim 7, characterized in that: The hoisting mechanism (100) includes a hoisting wire connecting block (101), a hoisting block (102), a hoisting rod (103), and an installation rod (104). The hoisting wire connecting block (101) is approximately an isosceles triangle with a hoisting wire hole (105) at the top center of its outer wall for connecting to the bottom end of the hoisting wire (93). The hoisting block (102) is square with its top center connected to the bottom end of the hoisting wire connecting block (101). The two sides of the outer wall of the hoisting block (102) are provided with hoisting rod connecting holes (106) for connecting to the hoisting rod (103). The top of the membrane aeration biofilm reactor (27) is provided with several inverted "U"-shaped installation rods (104) at equal intervals along its length.
9. A wetland water purification system based on microbubble aeration according to claim 8, characterized in that: The lower sides of the sidewall of the suspension line connecting block (101) are provided with inclined lifting holes (107); the sidewall of the lifting block (102) is provided with a plurality of lifting rod connecting holes (106) at equal intervals.
10. A wetland water purification system based on microbubble 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) includes a first limiting block (131), a second limiting block (132), a limiting ring (133), and a limiting hole (134). The first limiting block (131) is square in shape and is located on the rear top side of the hoisting rod (103). The second limiting block (132) is square in shape and is located on the left side of the middle part of the hoisting rod (103). The distance between the rear end of the lifting rod and the front end of the first limiting block (131) is greater than the thickness of the lifting block (102). The top of the lifting rod connecting hole (106) is the limiting hole (134) with the same cross-sectional shape as the first limiting block (131) and the second limiting block (132). The inner wall of the limiting ring (133) is fixed to the outer wall of the lifting rod (103). The distance between the rear end of the limiting ring (133) and the front end of the second limiting block (132) is equal to the thickness of the lifting block (102).