Subsurface flow constructed wetland system capable of automatically adjusting water distribution and water distribution

Abstract

The invention discloses a subsurface flow constructed wetland system capable of automatically adjusting water distribution and water distribution. The subsurface flow constructed wetland system sequentially comprises a water inlet unit, a horizontal subsurface flow unit, a vertical subsurface flow unit and a water outlet unit in the flowing direction of sewage, the water inlet unit is used for carrying out primary treatment on sewage and controlling the water inlet amount of the sewage; the horizontal subsurface flow unit is used for uniformly introducing sewage into the horizontal subsurface flow constructed wetland to purify the sewage and leading out the purified sewage; the vertical underflow unit is used for purifying the sewage which is led out again and leading out the sewage which is purified again; and the water outlet unit is used for collecting impurities in the sewage or adding chemicals for coagulation and precipitation treatment, and finally discharging the treated sewage. According to the invention, the uniformity of water distribution and water distribution can be improved, the treatment efficiency of the constructed wetland is improved, the effluent quality is stable and reaches the standard, and filler blockage is avoided.

Description

Technical Field

[0001] The present invention relates to the field of drainage treatment, and in particular to a subsurface artificial wetland system capable of automatically adjusting water distribution and water distribution. Background Art

[0002] As an ecological wastewater treatment measure, constructed wetlands are artificially constructed and controlled surfaces similar to swamps. Sewage and sludge are distributed in a controlled manner within these wetlands. As the sewage and sludge flow in a specific direction, they are treated primarily through the synergistic physical, chemical, and biological effects of soil, artificial media, plants, and microorganisms. These mechanisms include adsorption, retention, filtration, oxidation-reduction, precipitation, microbial decomposition, transformation, plant shading, residue accumulation, transpiration, water and nutrient absorption, and the action of various animals.

[0003] Uneven water distribution during operation can lead to excessive hydraulic loads in some areas, eroding the fill material, while other areas become stagnant or dry, reducing the overall treatment efficiency of the system. Uneven water flow can also create dead zones, where pollutants can accumulate and settle for extended periods, contributing to wetland blockage and hindering water flow. Furthermore, blocked areas can easily create anaerobic environments, release foul-smelling gases, and even cause pollutant backflow or overflow, contaminating upstream water and the surrounding environment, generating secondary pollution and impacting ecosystem stability and water quality compliance.

[0004] Therefore, in order to solve the above problems, a subsurface artificial wetland system with automatic adjustment of water distribution and water distribution is needed, which can improve the uniformity of water distribution and water distribution, enhance the treatment efficiency of artificial wetlands, ensure the stable water quality of effluent and avoid clogging of fillers. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to overcome the defects in the prior art and provide a submerged flow artificial wetland system that automatically adjusts water distribution and water distribution, which can improve the uniformity of water distribution and water distribution, enhance the treatment efficiency of artificial wetlands, ensure that the effluent water quality is stable and meets the standards, and avoid filler clogging.

[0006] The subsurface flow artificial wetland system for automatically regulating water distribution and water distribution of the present invention comprises an inlet unit, a horizontal subsurface flow unit, a vertical subsurface flow unit and an outlet unit in sequence along the flow direction of sewage;

[0007] The water inlet unit is used to perform preliminary treatment on the sewage and control the inflow of sewage;

[0008] The horizontal subsurface flow unit is used to evenly introduce sewage into the horizontal subsurface flow artificial wetland to purify the sewage and then lead the purified sewage out;

[0009] The vertical submerged flow unit is used to purify the discharged sewage again and discharge the purified sewage;

[0010] The water outlet unit is used to collect impurities in the sewage or perform coagulation and sedimentation treatment by adding drugs, and finally discharge the treated sewage.

[0011] Furthermore, along the flow direction of the sewage, the water inlet unit includes an oxidation pond and a water distribution well in sequence; the oxidation pond is provided with an aerator for oxygenating the sewage; the water distribution well is provided with a movable weir plate, and the water outflow rate is controlled by adjusting the height of the movable weir plate.

[0012] Furthermore, along the flow direction of the sewage, the horizontal subsurface flow unit includes a distribution well, a water distribution well, a horizontal subsurface flow artificial wetland and a water outlet well in sequence;

[0013] The distribution well is provided with a connecting pipe connected to the water distribution well. The connecting pipe is provided with a telescopic mechanism. The height of the water outlet is controlled by adjusting the height of the telescopic mechanism. When the water outlet height is higher than the liquid level in the distribution well, the sewage in the distribution well no longer enters the water distribution well.

[0014] The water distribution well receives the water from the distribution well and introduces the sewage into the horizontal subsurface flow artificial wetland;

[0015] The horizontal subsurface flow artificial wetland allows sewage to flow horizontally and treats pollutants in the sewage;

[0016] The outlet well is provided with an inlet pipe connected to the vertical submerged flow unit. The inlet pipe is provided with a telescopic mechanism. The height of the water outlet is controlled by adjusting the height of the telescopic mechanism, thereby adjusting the water output and controlling the submerged liquid level of the horizontal submerged flow artificial wetland.

[0017] Furthermore, the water distribution well is provided with a pipeline connected to the horizontal subsurface flow artificial wetland, and the pipeline is provided with a telescopic mechanism, and the height of the water outlet is controlled by adjusting the height of the telescopic mechanism.

[0018] Furthermore, the horizontal subsurface flow artificial wetland is provided with a horizontal flow water distribution pipe; the horizontal flow water distribution pipe is opened, and the height difference of the water head is controlled by the height of the horizontal flow water distribution pipe.

[0019] Furthermore, the horizontal subsurface flow artificial wetland discharges water to the outlet well through the perforated flower wall.

[0020] Furthermore, along the flow direction of the sewage, the vertical subsurface flow unit includes a vertical subsurface flow artificial wetland and an outlet channel;

[0021] The vertical subsurface flow artificial wetland allows sewage to infiltrate from top to bottom; the vertical subsurface flow artificial wetland is provided with a vertical flow water distribution pipe, and the vertical flow water distribution pipe adopts a "F"-shaped opening pipe;

[0022] The vertical subsurface flow artificial wetland is provided with an outlet pipe connected to the outlet channel. The outlet pipe is provided with a telescopic mechanism, and the height of the water outlet is controlled by adjusting the height of the telescopic mechanism.

[0023] Furthermore, the telescopic mechanism includes an adjustable hose, a telescopic rope, an electric winch, and a PLC;

[0024] Adjust the height of the telescopic mechanism to control the height of the water outlet according to the following method:

[0025] The detected liquid level difference signal is transmitted to the PLC of the telescopic mechanism, and the PLC controls the electric winch, which controls the length of the telescopic rope to adjust the height of the adjustable hose.

[0026] Furthermore, the relationship between the detected liquid level difference and the inlet and outlet water flow is:

[0027] Among them, Q is the inlet and outlet water flow rate, μ is the flow coefficient, A is the outlet area of ​​the adjustable hose, g is the acceleration of gravity, and H0 is the liquid level difference on both sides.

[0028] Furthermore, the subsurface flow artificial wetland system is used to perform the following regulation:

[0029] When the subsurface flow artificial wetland is in operation, each level of treatment structure is put into use to control the movable weir plate of the water distribution well, adjust the total water inflow of the artificial wetland, and control the telescopic mechanism to adjust the inlet and outlet flow of each wetland. When the liquid level difference of the water distribution well, the water outlet well and the outlet channel exceeds the control difference, that is, the inlet and outlet water flow is greater than the control flow, the automatic winch will work, shorten the length of the telescopic rope, and lift the adjustable hose outlet pipe; when the liquid level difference is lower than the control difference, that is, the inlet and outlet water flow is less than the control flow, the automatic winch will work, lengthen the length of the telescopic rope, lower the adjustable hose outlet pipe, and adjust the length of the telescopic rope according to the real-time data of the liquid level detection until the liquid level difference is within the calculated control liquid level range, and the automatic winch will stop working; when a single wetland needs to be isolated from the system to turn over the pool for dredging, the automatic winch is started, the telescopic rope is shortened, and the adjustable hose outlet pipe is lifted above the water surface to drain and desilt.

[0030] The beneficial effects of the present invention are as follows: the present invention discloses a subsurface artificial wetland system with automatic adjustment of water distribution and water distribution, which realizes that the water inlet and outlet of each wetland are adjustable and can be independently isolated from the overall system by setting a multi-stage flexible water distribution and water distribution and a control method, which is beneficial to the cleaning of a single pool, solves the problem of uneven water distribution and water distribution, ensures the efficient treatment function of the artificial wetland, makes the effluent water quality stable and meets the standards, avoids the situation of filler clogging, realizes the efficient operation of the artificial wetland, effectively guarantees the treatment effect and solves the purpose of wetland dredging. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The present invention will be further described below in conjunction with the accompanying drawings and embodiments:

[0032] Figure 1 Schematic diagram of the planar structure of the subsurface flow artificial wetland system of the present invention;

[0033] Figure 2 It is a side view of the movable weir plate of the present invention;

[0034] Figure 3 It is a schematic diagram of the arrangement of the telescopic mechanism of the present invention;

[0035] Figure 4 Schematic diagram of the control process of the subsurface flow artificial wetland system of the present invention;

[0036] Figure 5 This is a control logic block diagram for adjusting the height of the telescopic mechanism of the present invention;

[0037] Among them, 1-oxidation pond, 2-water distribution well, 3-distribution well, 4-water distribution well, 5-horizontal subsurface flow artificial wetland, 6-outlet well, 7-vertical subsurface flow artificial wetland, 8-outlet channel, 9-sedimentation pond and outlet pond, 10-movable weir plate, 11-telescopic mechanism. DETAILED DESCRIPTION

[0038] The present invention is further described below with reference to the accompanying drawings, as shown in the drawings:

[0039] This embodiment discloses a subsurface flow artificial wetland system that automatically adjusts water distribution and water distribution, which includes an inlet unit, a horizontal subsurface flow unit, a vertical subsurface flow unit, and an outlet unit in the direction of sewage flow.

[0040] The water inlet unit is used to perform preliminary treatment on the sewage and control the inflow of sewage;

[0041] The horizontal subsurface flow unit is used to evenly introduce sewage into the horizontal subsurface flow artificial wetland to purify the sewage and then lead the purified sewage out;

[0042] The vertical submerged flow unit is used to purify the discharged sewage again and discharge the purified sewage;

[0043] The water outlet unit is used to collect impurities in the sewage or perform coagulation and sedimentation treatment by adding drugs, and finally discharge the treated sewage.

[0044] In this embodiment, Figure 1As shown, along the flow direction of sewage, the water inlet unit includes an oxidation pond 1 and a water distribution well 2 in sequence; the oxidation pond 1 is provided with an aerator for oxygenating the sewage; the water out of the oxidation pond 1 enters the water distribution well 2, and the water distribution well 2 is provided with a movable weir plate 10. By adjusting the height of the movable weir plate 10, the water outflow rate is controlled, which is conducive to subsequent uniform water distribution. Among them, the movable weir plate 10 can be made of stainless steel plate, steel plate or composite new material, such as Figure 2 As shown, a, b, c, d, e, and f can be adjusted according to actual conditions and will not be described in detail here.

[0045] The installation of an oxidation pond 1 and a distribution well 2 at the water inlet unit effectively enhances wastewater pretreatment. Aerators within oxidation pond 1 oxygenate the wastewater, promoting the initial degradation of organic matter and the settling of suspended solids, thereby reducing subsequent wetland loads. A movable weir 10 within distribution well 2 adjusts its height in real time based on the water level, precisely controlling the outflow and ensuring even water distribution before entering the constructed wetland. This prevents overloading or underloading of certain wetland areas, thereby improving the system's overall treatment efficiency and extending the wetland's service life.

[0046] In this embodiment, Figure 1 As shown, along the flow direction of sewage, the horizontal subsurface flow unit includes a distribution well 3, a water distribution well 4, a horizontal subsurface flow artificial wetland 5 and a water outlet well 6 in sequence;

[0047] The distribution well 3 is provided with a connecting pipe connected to the water distribution well 4. The connecting pipe is provided with a telescopic mechanism 11. The height of the water outlet is controlled by adjusting the height of the telescopic mechanism 11. When the water outlet height is higher than the liquid level in the distribution well 3, the sewage in the distribution well 3 no longer enters the water distribution well 4, thereby achieving the purpose of isolating the horizontal subsurface flow artificial wetland 5 from the system.

[0048] The water distribution well 4 receives the water from the distribution well 3 and introduces the sewage into the horizontal subsurface flow artificial wetland 5;

[0049] The horizontal subsurface flow artificial wetland 5 allows sewage to flow horizontally and treats pollutants in the sewage;

[0050] The outlet well 6 is provided with an inlet pipe connected to the vertical submerged flow unit. The inlet pipe is provided with a telescopic mechanism 11. The height of the water outlet is controlled by adjusting the height of the telescopic mechanism 11, thereby adjusting the water output and controlling the submerged liquid level of the horizontal submerged flow artificial wetland 5.

[0051] By installing a height-adjustable telescopic mechanism 11 between the distribution well 3 and the water distribution well 4, precise control of the water inflow to the horizontal subsurface flow constructed wetland 5 is achieved. When the water level in the distribution well 3 drops below the outlet of the connecting pipe, the water inflow to the distribution well is automatically cut off, facilitating independent maintenance or cleaning of the wetland and improving system flexibility and operational reliability. Furthermore, by adjusting the height of the telescopic mechanism 11 at the outlet well 6, not only can the water flow be regulated, but the submerged liquid level within the wetland can also be stabilized, which helps maintain a healthy plant growth environment and microbial biofilm activity, thereby improving pollutant removal efficiency and overall treatment effectiveness.

[0052] In this embodiment, the water distribution well 4 is provided with a pipeline connected to the horizontal subsurface flow artificial wetland 5. The pipeline is provided with a telescopic mechanism 11. The height of the water outlet is controlled by adjusting the height of the telescopic mechanism 11.

[0053] By installing a telescopic mechanism 11 on the pipeline from the water distribution well 4 to the horizontal subsurface flow constructed wetland 5, the outlet height can be flexibly adjusted, thereby controlling the water flow rate entering the wetland. The water distribution intensity can be dynamically adjusted based on the real-time water level and flow demand, ensuring uniform sewage distribution within the wetland and avoiding blockages or dead zones caused by localized overload. This also facilitates the isolation and maintenance of individual wetland units, enhances the system's automated control capabilities and operational stability, and improves overall purification efficiency and service life.

[0054] In this embodiment, the horizontal subsurface flow constructed wetland 5 is provided with a horizontal flow distribution pipe; the horizontal flow distribution pipe is provided with holes, and the height difference of the outlet water head is controlled by setting the horizontal flow distribution pipe. The horizontal flow distribution pipe is a hose or a flexible pipe with a certain degree of curvature.

[0055] By installing horizontal water distribution pipes with openings and using flexible hoses or curved pipes, water distribution flexibility and uniformity are effectively improved. By adjusting the laying height of the water distribution pipes, the head difference between each water distribution hole can be precisely controlled, thereby adjusting the outflow rate and ensuring uniform distribution of sewage in the horizontal subsurface flow constructed wetland 5, avoiding the formation of short-circuits or dead zones.

[0056] In this embodiment, the horizontal subsurface flow constructed wetland 5 discharges water to the outlet well 6 through a perforated wall. Directing treated wastewater from the horizontal subsurface flow constructed wetland 5 to the outlet well 6 through the perforated wall effectively mitigates the impact of concentrated water flow on the substrate, evenly directs the outflow, and maintains stable hydraulic conditions within the wetland. Furthermore, the perforated structure helps intercept some suspended particles, improving outflow quality, slowing wetland clogging, and enhancing the durability and stability of the system's operation.

[0057] In this embodiment, Figure 1 As shown, along the flow direction of sewage, the vertical submerged flow unit includes a vertical submerged flow artificial wetland 7 and an outlet channel 8;

[0058] The vertical subsurface flow artificial wetland 7 allows sewage to infiltrate from top to bottom; the vertical subsurface flow artificial wetland 7 is provided with a vertical flow distribution pipe, and the vertical flow distribution pipe adopts a "F"-shaped opening pipe; wherein the opening size and spacing are standardized;

[0059] The vertical subsurface flow artificial wetland 7 is provided with an outlet pipe connected to the outlet channel 8. The outlet pipe is provided with a telescopic mechanism 11. By adjusting the height of the telescopic mechanism 11 to control the height of the outlet, the outlet pipe mouth can be raised above the liquid level, and the vertical subsurface flow artificial wetland 7 can be independently isolated from the system, which is beneficial to the pool turning and cleaning of a single wetland.

[0060] Through the vertical subsurface artificial wetland 7, sewage infiltration is achieved from top to bottom, increasing the contact time and depth between the water and the filler, plant roots, and microorganisms, thereby improving the efficiency of pollutant removal. The standardized orifice size and spacing of the "F"-shaped water distribution pipes help to distribute water evenly and prevent local short-circuits and water accumulation. The outlet pipe is equipped with a telescopic mechanism 11, which can flexibly control the water level. When the outlet is above the liquid level, the wetland unit can be hydraulically isolated, facilitating independent pool cleaning and maintenance, ensuring the continuous operation of the system and convenient maintenance and management.

[0061] In this embodiment, Figure 3 As shown, the telescopic mechanism 11 includes an adjustable hose, a telescopic rope, an electric winch, and a PLC. The height of the water outlet is controlled by adjusting the height of the telescopic mechanism 11 as follows:

[0062] The detected liquid level difference signal is transmitted to the PLC of the telescopic mechanism 11. The PLC controls the electric winch, which in turn controls the length of the telescopic rope, thereby adjusting the height of the adjustable hose. The liquid level difference signal is detected by a liquid level detection instrument. Such a liquid level detection instrument can be a hydrostatic level gauge, an ultrasonic level gauge, a radar level gauge, or the like, and will not be described in detail here.

[0063] Among them, the relationship between the detected liquid level difference and the inlet and outlet water flow is:

[0064] Where Q is the inlet and outlet water flow (m 3 / s), μ is the flow coefficient, A is the outlet area of ​​the adjustable hose (m 2 ), g is the acceleration due to gravity (m / s 2 ), H0 is the liquid level difference on both sides (m). The flow coefficient in the formula reflects the flow state and pipeline characteristics, and is usually in the range of 0.75 to 0.98. For the nozzle in the free outflow state, 0.82 can be taken as the calculation reference value, and for the nozzle in the submerged outflow state, 0.75 can be taken as the calculation reference value. The corresponding control logic block diagram is as follows Figure 5 shown.

[0065] By monitoring the liquid level difference in real time and automatically adjusting the outlet height through PLC-controlled telescopic mechanism 11, the system precisely controls the sewage outflow, ensuring stable system operation and avoiding wetland shock loads and fluctuations in treatment efficiency caused by sudden flow changes. The flexible adjustment of telescopic mechanism 11 improves water distribution uniformity, prevents blockages and short-circuiting, and offers strong adaptability, facilitating automated and intelligent operational management.

[0066] It should be noted that the horizontal subsurface flow constructed wetland 5 and the vertical subsurface flow constructed wetland 7 are the main treatment processes, including water distribution facilities, water distribution facilities, fillers, plants, water outlet facilities, isolation facilities, and emptying facilities, which will not be described in detail here. The water outlet unit includes a sedimentation pond and a water outlet pond 9, which are water outlet facilities for enhanced treatment and stabilization.

[0067] In this embodiment, the control method or principle of the subsurface flow constructed wetland system of the present invention is as follows:

[0068] When the subsurface artificial wetland is in operation, each level of treatment structure is put into use. The movable weir plate 10 of the water distribution well 2 is controlled to adjust the total water inflow of the artificial wetland. The telescopic mechanism 11 is controlled to adjust the inflow and outflow of water of each wetland. When the liquid level difference between the water distribution well 4, the water outlet well 6 and the outlet channel 8 exceeds the control difference calculated by the control method (the inflow and outflow flow is greater than the control flow), the automatic winch works, shortens the length of the telescopic rope, and lifts the outlet of the adjustable hose; when the liquid level difference is lower than the control difference calculated by the control method (the inflow and outflow flow is less than the control flow), the automatic winch works, lengthens the length of the telescopic rope, lowers the outlet of the adjustable hose, and adjusts the length of the telescopic rope according to the real-time data of the liquid level detection until the liquid level difference is within the calculated control liquid level range, and the automatic winch stops working. When a single wetland needs to be isolated from the system to turn over the pool for dredging, the automatic winch is started, the telescopic rope is shortened, and the outlet of the adjustable hose is lifted above the water surface to drain and desilt.

[0069] Among them, the liquid level difference measured by the liquid level detection instrument is interlocked with the working status of the automatic winch, and the liquid level difference is compared with the control difference calculated by the control method to start and stop the automatic winch, adjust the length of the telescopic rope, control the inlet and outlet water flow, and adjust the length of the telescopic rope according to the real-time data of the liquid level detection until the liquid level difference is within the calculated control liquid level range and the automatic winch stops working.

[0070] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not limiting. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the purpose and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A subsurface artificial wetland system with automatic water distribution and adjustment, characterized by: Along the flow direction of sewage, it includes water inlet unit, horizontal submerged flow unit, vertical submerged flow unit and water outlet unit in sequence; The water inlet unit is used to perform preliminary treatment on the sewage and control the inflow of sewage; The horizontal subsurface flow unit is used to evenly introduce sewage into the horizontal subsurface flow artificial wetland to purify the sewage and then lead the purified sewage out; The vertical submerged flow unit is used to purify the discharged sewage again and discharge the purified sewage; The water outlet unit is used to collect impurities in the sewage or perform coagulation and sedimentation treatment by adding drugs, and finally discharge the treated sewage.

2. The subsurface artificial wetland system with automatic water distribution and adjustment according to claim 1 is characterized in that: Along the flow direction of sewage, the water inlet unit includes an oxidation pond and a water distribution well in sequence; the oxidation pond is provided with an aerator for oxygenating the sewage; the water distribution well is provided with a movable weir plate, and the water flow rate is controlled by adjusting the height of the movable weir plate.

3. The subsurface artificial wetland system with automatic water distribution and adjustment according to claim 1 is characterized in that: Along the flow direction of sewage, the horizontal subsurface flow unit includes a distribution well, a water distribution well, a horizontal subsurface flow artificial wetland and a water outlet well in sequence; The distribution well is provided with a connecting pipe connected to the water distribution well. The connecting pipe is provided with a telescopic mechanism. The height of the water outlet is controlled by adjusting the height of the telescopic mechanism. When the water outlet height is higher than the liquid level in the distribution well, the sewage in the distribution well no longer enters the water distribution well. The water distribution well receives the water from the distribution well and introduces the sewage into the horizontal subsurface flow artificial wetland; The horizontal subsurface flow artificial wetland allows sewage to flow horizontally and treats pollutants in the sewage; The outlet well is provided with an inlet pipe connected to the vertical submerged flow unit. The inlet pipe is provided with a telescopic mechanism. The height of the water outlet is controlled by adjusting the height of the telescopic mechanism, thereby adjusting the water output and controlling the submerged liquid level of the horizontal submerged flow artificial wetland.

4. The subsurface artificial wetland system with automatic water distribution and adjustment according to claim 3 is characterized by: The water distribution well is provided with a pipeline connected to the horizontal subsurface flow artificial wetland, and a telescopic mechanism is provided on the pipeline, and the height of the water outlet is controlled by adjusting the height of the telescopic mechanism.

5. The subsurface artificial wetland system with automatic water distribution and adjustment according to claim 3 is characterized in that: The horizontal subsurface flow artificial wetland is provided with a horizontal flow water distribution pipe; the horizontal flow water distribution pipe is opened, and the height difference of the water head of the outlet water is controlled by the height of the horizontal flow water distribution pipe.

6. The subsurface flow constructed wetland system with automatic water distribution and adjustment according to claim 5 is characterized by: The horizontal subsurface flow artificial wetland discharges water to the outlet well through the perforated flower wall.

7. The subsurface artificial wetland system with automatic water distribution and adjustment according to claim 1 is characterized in that: Along the flow direction of sewage, the vertical subsurface flow unit includes a vertical subsurface flow artificial wetland and an outlet channel; The vertical subsurface flow artificial wetland allows sewage to infiltrate from top to bottom; the vertical subsurface flow artificial wetland is provided with a vertical flow water distribution pipe, and the vertical flow water distribution pipe adopts a "F"-shaped opening pipe; The vertical subsurface flow artificial wetland is provided with an outlet pipe connected to the outlet channel. The outlet pipe is provided with a telescopic mechanism, and the height of the water outlet is controlled by adjusting the height of the telescopic mechanism.

8. The subsurface artificial wetland system with automatic water distribution and adjustment according to claim 4 or 7, characterized in that: The telescopic mechanism includes an adjustable hose, a telescopic rope, an electric winch and a PLC; Adjust the height of the telescopic mechanism to control the height of the water outlet according to the following method: The detected liquid level difference signal is transmitted to the PLC of the telescopic mechanism, and the PLC controls the electric winch, which controls the length of the telescopic rope to adjust the height of the adjustable hose.

9. The subsurface artificial wetland system with automatic water distribution and adjustment according to claim 8, characterized in that: The relationship between the detected liquid level difference and the inlet and outlet water flow is: Among them, Q is the inlet and outlet water flow rate, μ is the flow coefficient, A is the outlet area of ​​the adjustable hose, g is the acceleration of gravity, and H0 is the liquid level difference on both sides.

10. The subsurface artificial wetland system with automatic water distribution and adjustment according to claim 8, characterized in that: The subsurface flow artificial wetland system is used to perform the following regulation: When the subsurface flow artificial wetland is in operation, each level of treatment structure is put into use to control the movable weir plate of the water distribution well, adjust the total water inflow of the artificial wetland, and control the telescopic mechanism to adjust the inlet and outlet flow of each wetland. When the liquid level difference of the water distribution well, the water outlet well and the outlet channel exceeds the control difference, that is, the inlet and outlet water flow is greater than the control flow, the automatic winch will work, shorten the length of the telescopic rope, and lift the adjustable hose outlet pipe; when the liquid level difference is lower than the control difference, that is, the inlet and outlet water flow is less than the control flow, the automatic winch will work, lengthen the length of the telescopic rope, lower the adjustable hose outlet pipe, and adjust the length of the telescopic rope according to the real-time data of the liquid level detection until the liquid level difference is within the calculated control liquid level range, and the automatic winch will stop working; when a single wetland needs to be isolated from the system to turn over the pool for dredging, the automatic winch is started, the telescopic rope is shortened, and the adjustable hose outlet pipe is lifted above the water surface to drain and desilt.

Images