Low-temperature-resistant constructed wetland ecological treatment system

Abstract

The utility model provides a low-temperature-resistant artificial wetland ecological treatment system which comprises a water inlet unit, a treatment unit and a water outlet unit, sewage to be treated flows into the water inlet unit, and the water flow can be adjusted through the water inlet unit; the water inlet unit is communicated with one end of the treatment unit and is used for uniformly distributing water to the treatment unit, and the treatment unit is used for treating inflowing sewage; the water outlet unit is communicated with the other end of the treatment unit, water treated by the treatment unit flows out through the water outlet unit, and the water outlet unit can regulate and control the operation water level of the treatment unit so as to realize low-temperature-resistant operation. The low-temperature-resistant constructed wetland ecological treatment system provided by the utility model has the technical effects that water can be uniformly distributed, the water level can be regulated and controlled during sewage treatment, low-temperature operation can be resisted, and the sewage treatment efficiency is high.

Description

Technical Field

[0001] This utility model belongs to the field of constructed wetland technology, and more specifically, it relates to a low-temperature resistant constructed wetland ecological treatment system. Background Technology

[0002] Constructed wetland wastewater treatment systems, as a novel ecological restoration technology for wastewater bodies, utilize the synergistic effects of physical, chemical, and biological processes involving fillers (including soil), plants, and microorganisms to purify wastewater. They offer advantages such as low construction costs, ease of operation and maintenance, near-zero power operation, buffering of hydraulic and pollution load impacts, and simple and practical technology, making them a rapidly developing new wastewater treatment technology in recent years.

[0003] Given the numerous advantages of constructed wetlands, they are widely used in my country's ecological and environmental infrastructure construction, and various combinations of wetland technologies, structures, and substrate compositions have been proposed and applied. However, in general, the limitations of constructed wetlands have not been effectively overcome, mainly in the following three aspects.

[0004] First, it has low hydraulic load and occupies a large land area.

[0005] Secondly, the treatment efficiency is greatly affected by temperature. Wastewater treatment is not effective under low-temperature conditions, which limits the promotion and application of constructed wetlands in northern my country.

[0006] Therefore, there is an urgent need to develop a technology that can save land resources, ensure that wetland treatment capacity is not significantly reduced under low temperature weather conditions, reduce maintenance costs, and extend the life of substrate filler. This technology has broad application value and significant environmental, economic and social benefits. Utility Model Content

[0007] The purpose of this invention is to provide a low-temperature resistant constructed wetland ecological treatment system, which aims to solve the technical problems of uneven water distribution and poor low-temperature operation in the existing constructed wetland when treating sewage.

[0008] To achieve the above objectives, the technical solution adopted by this utility model is: to provide a low-temperature resistant artificial wetland ecological treatment system, comprising:

[0009] The wastewater to be treated flows into the inlet unit, and the water flow rate of the inlet unit can be adjusted.

[0010] The treatment unit is connected to one end of the water inlet unit and is used to evenly distribute water to the treatment unit. The treatment unit is used to treat the incoming sewage.

[0011] The water outlet unit is connected to the other end of the treatment unit. Water treated by the treatment unit flows out through the water outlet unit. The water outlet unit can regulate the operating water level of the treatment unit to achieve low-temperature operation.

[0012] In one possible implementation, the water inlet unit includes:

[0013] A water inlet channel is provided on the side near the treatment unit, and a water passage hole is opened on the side of the water inlet channel near the treatment unit, through which water inside the water inlet channel flows out;

[0014] An adjustable gate is slidably connected to the water inlet channel and is used to block and cover the water passage. The adjustable gate is adapted to adjust the opening of the water passage by sliding, thereby adjusting the water flow rate to the treatment unit.

[0015] A water distribution tank is located above the processing unit and below the water passage hole, and the water distribution tank is used to receive water flowing out from the water passage hole;

[0016] The main water distribution pipe is connected at its upper end to the bottom of the water distribution tank;

[0017] The perforated water distribution pipe is horizontally arranged and connected to the lower end of the main water distribution pipe. Water discharged from the water distribution tank passes through the main water distribution pipe and the perforated water distribution pipe in sequence and flows into the interior of the treatment unit.

[0018] In one possible implementation, the processing unit includes:

[0019] An impermeable layer is installed at the bottom of the pool.

[0020] A lightweight granular packing bed, located at the upper end of the impermeable layer, includes lightweight granular packing of a certain thickness;

[0021] The upper box is a plurality of evenly arranged upper boxes, the upper box is filled with box packing material, wetland plants are planted in the upper box, the plurality of upper boxes are used to restrict the floating of the lightweight granular packing bed, and the plurality of upper boxes and the plurality of box packing materials form a plurality of modular units.

[0022] The box packing material can be removed from and inserted into the upper box, and the lightweight granular packing material, the box packing material, and the wetland plants are all used for wastewater treatment.

[0023] In one possible implementation, the density of the lightweight particulate packing is less than 1000 kg / m³, and the density of the box packing is greater than 1000 kg / m³.

[0024] In one possible implementation, the upper housing includes:

[0025] The wire mesh cage has an open top. The cage is filled with filler material. The wetland plants are buried or planted inside the wire mesh cage and grow upwards from the top of the wire mesh cage.

[0026] In one possible implementation, the wire mesh box is cube-shaped or cuboid, and a handle is connected to the upper end of the wire mesh box.

[0027] In one possible implementation, the wire mesh box has a plurality of uniformly arranged mesh openings, the diameter of which is smaller than the particle size of the box filler.

[0028] In one possible implementation, the lightweight particulate filler is ceramsite or composite ceramsite with a particle size of 20-25 mm; the box filler has a particle size of 10-20 mm.

[0029] In one possible implementation, the water outlet unit includes:

[0030] The water outlet channel is located on the other side near the processing unit;

[0031] A perforated water collection pipe is horizontally installed at the bottom inside the treatment unit.

[0032] One end of the main water collection pipe is connected to the perforated water collection pipe;

[0033] A rotating elbow connects one end to the other end of the main water collection pipe;

[0034] The water outlet pipe has one end connected to the other end of the rotary elbow, and the other end placed inside the water outlet channel. The water treated by the treatment unit flows into the water outlet channel after passing through the perforated water collection pipe, the main water collection pipe, the rotary elbow and the water outlet pipe in sequence.

[0035] By rotating the rotary elbow, the height of the end of the water outlet pipe furthest from the rotary elbow can be adjusted, thereby regulating the operating water level of the treatment unit to achieve low-temperature operation.

[0036] The beneficial effects of the low-temperature resistant constructed wetland ecological treatment system provided by this utility model are as follows: Compared with the prior art, the low-temperature resistant constructed wetland ecological treatment system of this utility model includes an inlet unit, a treatment unit, and an outlet unit. The sewage to be treated flows into the inlet unit, and the water flow rate of the inlet unit can be adjusted. The inlet unit is connected to one end of the treatment unit and is used to evenly distribute water to the treatment unit. The treatment unit is used to treat the inflowing sewage. The outlet unit is connected to the other end of the treatment unit, and the water treated by the treatment unit flows out through the outlet unit. The outlet unit can regulate the operating water level of the treatment unit to achieve low-temperature resistant operation. It solves the technical problems of uneven water distribution and poor operation in low winter temperatures when treating sewage, and has the technical effects of even water distribution, water level regulation during sewage treatment, low-temperature resistant operation, and high sewage treatment efficiency. Attached Figure Description

[0037] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0038] Figure 1 A schematic diagram of a low-temperature resistant artificial wetland ecological treatment system provided for an embodiment of this utility model;

[0039] Figure 2 A top view of a low-temperature resistant constructed wetland ecological treatment system provided for an embodiment of this utility model;

[0040] Figure 3 A front view of a low-temperature resistant constructed wetland ecological treatment system provided for an embodiment of this utility model;

[0041] Figure 4 A schematic diagram of the usage state structure of the water inlet unit of a low-temperature resistant artificial wetland ecological treatment system provided in this embodiment of the utility model;

[0042] Figure 5 A schematic diagram of another usage state of the water inlet unit of a low-temperature resistant artificial wetland ecological treatment system provided for an embodiment of this utility model;

[0043] Figure 6 A front view of the treatment unit structure of a low-temperature resistant constructed wetland ecological treatment system provided in this embodiment of the utility model;

[0044] Figure 7A schematic diagram of the upper box structure of a low-temperature resistant artificial wetland ecological treatment system provided in this embodiment of the present invention;

[0045] Figure 8 A schematic diagram of the exploded structure of the upper box of a low-temperature resistant artificial wetland ecological treatment system provided in this embodiment of the present invention;

[0046] Figure 9 A top view of the effluent unit structure of a low-temperature resistant constructed wetland ecological treatment system provided in this embodiment of the utility model;

[0047] Figure 10 A front view of the effluent unit structure of a low-temperature resistant constructed wetland ecological treatment system provided in this embodiment of the utility model;

[0048] Figure 11 This is a schematic diagram showing the state of the rotating elbow of the effluent unit of a low-temperature resistant artificial wetland ecological treatment system after rotation, its original state, and the difference in operating water level, provided for an embodiment of this utility model.

[0049] In the diagram: 1. Water inlet unit; 11. Water inlet channel; 12. Adjustable gate; 13. Water distribution trough; 14. Main water distribution pipe; 15. Perforated water distribution pipe; 16. Water passage hole; 17. Scale;

[0050] 2. Treatment unit; 21. Impermeable layer; 22. Lightweight granular packing bed; 23. Upper box; 231. Box packing; 232. Wetland plants; 233. Wire mesh box; 234. Handle; 235. Mesh;

[0051] 3. Water outlet unit; 31. Water outlet channel; 32. Perforated water collection pipe; 33. Main water collection pipe; 34. Rotary elbow; 35. Water outlet pipe. Detailed Implementation

[0052] To make the technical problems, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0053] Please refer to the following: Figures 1 to 11This invention provides a low-temperature resistant constructed wetland ecological treatment system. The system includes an inlet unit 1, a treatment unit 2, and an outlet unit 3. Wastewater to be treated flows into the inlet unit 1, and the water flow rate of the inlet unit 1 is adjustable. The inlet unit 1 is connected to one end of the treatment unit 2 and is used to evenly distribute water to the treatment unit 2, which treats the incoming wastewater. The outlet unit 3 is connected to the other end of the treatment unit 2, and the water treated by the treatment unit 2 flows out through the outlet unit 3. The outlet unit 3 can regulate the operating water level of the treatment unit 2 to achieve low-temperature resistant operation.

[0054] This utility model provides a low-temperature resistant constructed wetland ecological treatment system. Compared with the prior art, this low-temperature resistant constructed wetland ecological treatment system, by setting an inlet unit 1 that can adjust the water flow, can make the sewage evenly distributed to the treatment unit 2. By setting an outlet unit 3, the operating water level of the treatment unit 2 can be controlled, thereby enabling it to operate under low temperature conditions. It solves the technical problems of uneven water distribution and poor operation in low winter temperatures when treating sewage. It has the technical effects of uniform water distribution, adjustable water level when treating sewage, resistance to low temperature operation, and high sewage treatment efficiency.

[0055] In some embodiments, please refer to Figures 1-3 , Figures 4-5The water inlet unit 1 includes an inlet channel 11, an adjustable gate 12, a water distribution trough 13, a main water distribution pipe 14, and a perforated water distribution pipe 15. The inlet channel 11 is located on the side near the treatment unit 2, and a water passage hole 16 is opened on the side of the inlet channel 11 near the treatment unit 2. Water inside the inlet channel 11 flows out through the water passage hole 16. The adjustable gate 12 is slidably connected to the inlet channel 11 and is used to block and cover the water passage hole 16. The adjustable gate 12 is adapted to adjust the water passage hole 16 by sliding. The opening of valve 6 adjusts the water flow rate to treatment unit 2. Water distribution tank 13 is located above treatment unit 2 and below water passage 16, receiving water flowing from water passage 16. The upper end of water distribution main pipe 14 connects to the bottom of water distribution tank 13. Perforated water distribution pipe 15 is horizontally positioned and connected to the lower end of water distribution main pipe 14. Water discharged from water distribution tank 13 passes sequentially through water distribution main pipe 14 and perforated water distribution pipe 15, flowing into treatment unit 2. Wastewater to be treated flows into inlet channel 11. When adjustable gate 12 is opened, wastewater inside inlet channel 11 is discharged through water passage 16 and flows into water distribution tank 13, finally flowing into treatment unit 2 through perforated water distribution pipe 15. The adjustable gate 12 is slidably connected to the side of the inlet channel 11. The sliding direction of the adjustable gate 12 is vertical. Sliding downward can block the water passage 16, and sliding upward can block or open the water passage 16. The opening degree or range of the water passage 16 can be adjusted by the lifting height of the adjustable gate 12. The larger the opening degree, the larger the water flow, and vice versa, thus realizing the regulation of water flow.

[0056] Specifically, a scale 17 is installed on the side of the inlet channel 11 to show the water level inside the channel. The upper end of the distribution tank 13 is open or can be closed to hold water, serving as a buffer and temporary storage for the water. Normally, the main water distribution pipe 14 is vertically installed, with its lower end connected to the middle of the perforated water distribution pipe 15. The perforated water distribution pipe 15 is a type of water pipe with multiple holes evenly distributed along its axial direction. Wastewater can flow out from the holes and towards the treatment unit 2.

[0057] In some embodiments, please refer to Figures 1-3 , Figures 6-8The treatment unit 2 includes a seepage-proof layer 21, a lightweight granular packing bed 22, and an upper chamber 23. The seepage-proof layer 21 is located at the bottom of the tank. The lightweight granular packing bed 22 is located above the seepage-proof layer 21 and includes lightweight granular packing of a certain thickness with a density of less than 1000 kg / m³. When the lightweight granular packing becomes clogged and needs cleaning, the upper chamber 23 can be moved away from the lightweight granular packing bed 22. During the cleaning process, the lightweight granular packing bed 22 is in a suspended fluidized state. There are multiple upper chambers 23 arranged evenly. The interior is filled with box-shaped packing material 231, and wetland plants 232 are planted in the upper box 23. The density of the box-shaped packing material 231 is greater than 1000 kg / m³. Multiple upper boxes 23 are used to restrict the floating of the lightweight granular packing bed 22. Multiple upper boxes 23 and multiple box-shaped packing materials 231 form multiple modular units. The box-shaped packing material 231 can be taken out from inside the upper box 23 and inserted into the upper box 23, realizing modular rapid assembly. The lightweight granular packing material, box-shaped packing material 231, and wetland plants 232 are all used for wastewater treatment. The impermeable layer 21 can prevent water from seeping into the lower part of the pool or into the soil. This impermeable layer 21 is a prior art technology and is coated on the bottom wall of the pool. The pool has a pit-like structure in the prior art. Multiple lightweight granular packing materials are combined to form a lightweight granular packing bed 22, which is distributed on the upper part of the impermeable layer 21. Multiple upper chambers 23 are arranged in contact with each other, that is, two adjacent upper chambers 23 are in contact with each other, located at the upper end of the lightweight particle packing bed 22, which plays a role in pressing down the lightweight particle packing bed 22.

[0058] In some embodiments, please refer to Figures 1-3 , Figures 6-8 The upper box 23 includes a wire mesh box 233 and handles 234. The upper end of the wire mesh box 233 is open. The box filler 231 is filled inside the wire mesh box 233. Wetland plants 232 are buried or planted inside the wire mesh box 233 at the bottom and extend upwards from the top of the wire mesh box 233. The wire mesh box 233 has a plurality of evenly distributed mesh holes 235. The diameter of the mesh holes 235 is smaller than the diameter or particle size of the box filler 231, so that the box filler 231 will not leak out from the mesh holes 235. The handles 234 are connected to the outside of the wire mesh box 233. The wire mesh box 233 is a wire mesh box made of lead wire. The mesh box has mesh holes 235 and is square in shape when viewed from above. There are four handles 234, which are all located at the upper ends of the four ends of the wire mesh box 233 for workers to hold and pull the wire mesh box 233 to move it. The box packing 231 is an integral structure formed by the combination of multiple packings filled inside the wire mesh box 233. The particle size of the box packing 231 refers to the diameter of a single packing.

[0059] As a preferred embodiment, the length, width, and height of the wire mesh box 233 are 0.3m, 1m, and 1m, respectively.

[0060] In some embodiments, please refer to Figures 1-3 , Figures 6-8 The lightweight granular filler is made of ceramsite or composite ceramsite with a particle size of 20-25 mm; the box filler 231 has a particle size of 10-20 mm. The lightweight granular filler is in a suspended fluidized state during the cleaning process. During operation, the lightweight granular filler is in a compacted state, purifying the water through the physicochemical action of the granular filler itself, the presence of numerous microorganisms attached to it, and the action of plants. During cleaning, the lightweight granular filler is in a suspended fluidized state, facilitating the removal of impurities and old biofilm from the gaps in the filler, which are then discharged outside the treatment unit 2. The box filler 231 can be made of gravel, which has a density greater than that of water, while the lightweight granular filler has a density less than that of water. The box filler 231 acts as an anti-buoyancy barrier for the lightweight granular filler, preventing its loss, while the upper box 23 provides an attachment substrate for plant growth. In this embodiment, a certain thickness of lightweight granular filler refers to an integral structure formed by combining multiple lightweight granular fillers (i.e., ceramsite or composite ceramsite), which has a certain thickness.

[0061] In winter, the wetland plants 232 growing on the upper chamber 23 can be harvested and laid flat to cover the top of the upper chamber 23. As a slow-release plant carbon source, it increases the C / N ratio of the treated water in winter, promotes ammonification and denitrification, and the covering plants can also play a role in heat preservation.

[0062] In some embodiments, please refer to Figures 1-2 , Figures 9-11The water outlet unit 3 includes an outlet channel 31, a perforated water collection pipe 32, a main water collection pipe 33, a rotary elbow 34, and an outlet pipe 35. The outlet channel 31 is located near the other side of the treatment unit 2. The perforated water collection pipe 32 is horizontally located at the bottom of the inner side of the treatment unit 2. One end of the main water collection pipe 33 is connected to the perforated water collection pipe 32. One end of the rotary elbow 34 is connected to the other end of the main water collection pipe 33. One end of the outlet pipe 35 is connected to the other end of the rotary elbow 34, and the other end is placed inside the outlet channel 31. The water treated by the treatment unit 2 flows into the outlet channel 31 after passing through the perforated water collection pipe 32, the main water collection pipe 33, the rotary elbow 34, and the outlet pipe 35 in sequence. By rotating the rotary elbow 34, the height of the end of the outlet pipe 35 away from the rotary elbow 34 can be adjusted, thereby regulating the operating water level of the treatment unit 2 to achieve low-temperature operation. The outlet channel 31 and the inlet channel 11 are respectively located on both sides or at both ends of the pool. The perforated water collection pipe 32 is also a type of water pipe with multiple holes evenly distributed along the pipe axis. The treated water enters the perforated water collection pipe 32 through the holes and finally flows into the outlet channel 31. It should be noted that in the actual use, the rotating elbow 34 can be rotated reasonably according to the water level to control the water level. The rotating elbow 34 is a type of rotary joint in the prior art. It can rotate itself, thereby driving the outlet pipe 35 to rotate or swing together. Excess water will be discharged from the outlet pipe 35 into the outlet channel 31. The water level in the outlet pipe 35 is the same as the water level in the treatment unit 2.

[0063] Specifically, the water level in the outlet pipe 35 is varied by rotating the elbow 34, thereby regulating the water level in treatment unit 2 to meet the wetland's water level requirements during operation. Especially in low-temperature winter conditions, the water level can be raised initially, and after a certain thickness of ice has formed on the wetland surface, the water level in treatment unit 2 can be lowered, creating an air layer between the ice layer and the lightweight granular filler, with a thickness of [missing information]. Figure 11 The height represented by H in the middle serves to insulate the area, allowing the wetland to continue operating even in low-temperature winter conditions.

[0064] In this invention, the lightweight granular packing material is in a compacted state during the processing and operation process. The water quality is purified through the physicochemical action of the lightweight granular packing material itself, the large number of microorganisms attached to the lightweight granular packing material, and the action of plants.

[0065] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A cold resistant constructed wetland ecological treatment system, characterized in that, The application relates to a sewage treatment device. The sewage treatment device comprises: an inlet unit, into which sewage to be treated flows, and the water flow through the inlet unit can be adjusted; a treatment unit, which is communicated with one end of the inlet unit and is used for uniformly distributing water to the treatment unit, and the treatment unit is used for treating the inflowing sewage; 2. The low temperature resistant artificial wetland ecological treatment system according to claim 1, characterized in that, an outlet unit, which is communicated with the other end of the treatment unit, and the water treated by the treatment unit flows out through the outlet unit, and the outlet unit can regulate the running water level of the treatment unit to realize low-temperature resistance operation. The inlet unit comprises: an inlet channel, which is arranged near one side of the treatment unit, and a water passing hole is arranged on the side of the inlet channel near the treatment unit, and the water inside the inlet channel flows out from the water passing hole; an adjustable gate, which is slidably connected to the inlet channel and is used for blocking and covering the water passing hole, and the adjustable gate is adapted to adjust the opening degree of the water passing hole through sliding, so as to adjust the water flow to the treatment unit; a distribution tank, which is arranged above the treatment unit and below the water passing hole, and the distribution tank is used for receiving the water flowing out from the water passing hole; a water distribution main pipe, the upper end of which is communicated with the bottom of the distribution tank; 3. The low temperature resistant artificial wetland ecological treatment system according to claim 1, characterized in that, a perforated water distribution pipe, which is arranged in a horizontal shape and is communicated with the lower end of the water distribution main pipe, and the water discharged from the distribution tank sequentially passes through the water distribution main pipe and the perforated water distribution pipe and then flows into the treatment unit. The treatment unit comprises: an anti-seepage layer, which is arranged at the bottom of the pool body; a light-weight granular filler bed, which is arranged at the upper end of the anti-seepage layer and comprises light-weight granular fillers with a certain thickness; a plurality of upper boxes, which are arranged uniformly, are filled with box fillers, and are planted with wetland plants, and the plurality of upper boxes are used for limiting the floating of the light-weight granular filler bed, and the plurality of upper boxes and the plurality of box fillers form a plurality of modular units; 4. A low temperature resistant constructed wetland ecological treatment system as claimed in claim 3, wherein, wherein the box fillers can be taken out from and loaded into the upper boxes, and the light-weight granular fillers, the box fillers and the wetland plants are used for treating sewage.

5. A low temperature resistant artificial wetland ecological treatment system according to claim 3, wherein, The density of the light-weight granular fillers is less than 1000 kg / m3, and the density of the box fillers is greater than 1000 kg / m3. The upper box comprises:

6. A low temperature resistant artificial wetland ecological treatment system as claimed in claim 5, wherein, a lead wire mesh box, the upper end of which is arranged in an open manner, the box fillers are filled in the lead wire mesh box, and the lower part of the wetland plants is buried or planted in the lead wire mesh box and the upper part of the wetland plants extends and grows above the lead wire mesh box.

7. A low temperature resistant artificial wetland ecological treatment system as claimed in claim 5, wherein, The lead wire mesh box is in a square or cuboid shape, and a handle is connected to the upper end of the lead wire mesh box.

8. The low temperature resistant artificial wetland ecological treatment system of claim 3, wherein, The lead wire mesh box is provided with a plurality of mesh holes arranged uniformly, and the diameter of the mesh holes is less than the particle size of the box fillers.

9. The low temperature resistant artificial wetland ecological treatment system of claim 3, wherein, The light-weight granular fillers are ceramic granules or composite ceramic granules, and the particle size is 20-25 mm.

10. The low temperature resistant artificial wetland ecological treatment system of claim 1, wherein, The particle size of the box fillers is 10-20 mm. The outlet unit comprises: an outlet channel, which is arranged near the other side of the treatment unit; a perforated water collecting pipe, which is arranged in a horizontal shape at the bottom of the inner side of the treatment unit; a water collecting main pipe, one end of which is communicated with the perforated water collecting pipe; a rotary elbow, one end of which is communicated with the water collecting main pipe and the other end of which is communicated with The water outlet pipe is communicated with the rotating elbow at one end and is arranged in the water outlet channel at the other end. The water treated by the treatment unit flows into the water outlet channel through the perforated water collecting pipe, the water collecting main pipe, the rotating elbow and the water outlet pipe in sequence. The height of the one end of the water outlet pipe away from the rotating elbow is adjusted by rotating the rotating elbow, so that the running water level of the treatment unit is regulated and controlled, and the low-temperature resistance operation is realized.

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