Vertical subsurface flow wetland system

Abstract

The present invention discloses a vertical subsurface flow wetland system, and relates to the technical field of artificial wetlands, the vertical subsurface flow wetland system comprises: a wetland main body, the wetland main body comprises a purification pool, the purification pool is internally provided with a base layer, a filler layer and a soil layer in sequence from bottom to top, and the soil layer is used for planting aquatic plants; the aeration device comprises an aeration pipe and an air supply device, the aeration pipe is located at the bottom of the filler layer, vent holes are formed in the aeration pipe, and the air supply device is connected with the aeration pipe and used for supplying air to the aeration pipe; wherein the aeration device is arranged in the purification tank in a sliding manner through a sliding mechanism. According to the vertical subsurface flow wetland system, the purification effect can be improved, the service life is prolonged, and the construction cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of constructed wetlands, and particularly to a vertical subsurface flow wetland system. Background Art

[0002] Subsurface flow wetlands are an artificial ecosystem that simulates natural wetlands. Through the combined action of plants, substrates, and microorganisms, sewage is ecologically treated. According to the different flow states of sewage in subsurface flow wetlands, subsurface flow constructed wetlands can be divided into surface flow subsurface flow wetlands, horizontal flow subsurface flow wetlands, and vertical flow subsurface flow constructed wetlands. Surface flow subsurface flow wetlands refer to artificial wetlands where the water surface is above the soil surface and the water flows from the inlet end to the outlet end. Horizontal flow subsurface flow constructed wetlands refer to artificial wetlands where the water surface is below the filler surface and the water flows horizontally from the inlet end to the outlet end. Vertical subsurface flow constructed wetlands refer to artificial wetlands where the water vertically flows through the filler layer. Among them, vertical subsurface flow constructed wetlands can be further divided into downward vertical flow constructed wetlands and upward vertical flow constructed wetlands according to different water flow directions. Compared with surface flow subsurface flow wetlands and horizontal subsurface flow wetlands, vertical subsurface flow constructed wetlands have a higher pollutant removal rate and a smaller floor area, and are widely used in the tail water of sewage treatment plants and domestic sewage treatment.

[0003] During the operation of subsurface flow wetlands, on the one hand, suspended solids, microbial extracellular polymers, and shed bacterial aggregates carried in the sewage will clog the matrix pores, reduce the permeability coefficient, decrease the hydraulic load and pollutant removal rate, and even cause waterlogging in the wetland, leading to bad odors, breeding mosquitoes and flies, and seriously affecting the overall landscape effect and public environment of the constructed wetland. On the other hand, insufficient oxygen inside the subsurface flow wetland will slow down the conversion of ammonia nitrogen to nitrate by nitrifying bacteria, seriously affecting the sewage purification effect, causing the deterioration of the physical and chemical environment and the decline of microbial activity, and ultimately hindering the long-term operation of the subsurface flow wetland system.

[0004] An anti-clogging aeration subsurface flow wetland system known to the inventor mainly consists of an aeration component, an aeration pipe, a fixed frame, a support link, etc. The oxygen content of the water body is increased through the aeration component, but this device needs to set multiple aeration components, resulting in a certain amount of material waste, and the clogging problem that easily occurs during the operation of the subsurface flow wetland cannot be well solved only by the aeration device, which has certain limitations.

[0005] Therefore, a vertical subsurface flow wetland system is provided to solve the above problems existing in the prior art. Summary of the Invention

[0006] The object of the present invention is to provide a vertical subsurface flow wetland system to solve the problems existing in the prior art, which can improve the purification effect, extend the service life, and reduce the project cost.

[0007] To achieve the above object, the present invention provides the following solution:

[0008] The present invention provides a vertical subsurface flow wetland system, comprising:

[0009] A wetland main body, the wetland main body including a purification pond, in which a base layer, a filler layer and a soil layer are sequentially arranged from bottom to top, and the soil layer is used for planting aquatic plants;

[0010] An aeration device, the aeration device including an aeration pipe and a gas supply device, the aeration pipe being located at the bottom of the filler layer, and ventilation holes being arranged on the aeration pipe, the gas supply device being connected to the aeration pipe for supplying gas to the aeration pipe; wherein, the aeration device is slidably arranged in the purification pond through a sliding mechanism.

[0011] Preferably, the wetland main body further includes a water collecting channel and a water distribution channel, the water distribution channel being connected to the top of the purification pond through a water distribution pipe for supplying water to the purification pond; the water collecting channel being connected to the bottom of the purification pond through a water collecting pipe for recovering the water body in the purification pond.

[0012] Preferably, the water collecting channel and the water distribution channel are respectively located on both sides in the width direction of the purification pond and extend along the width direction of the purification pond.

[0013] Preferably, the filler layer is a mixed filler layer, including a lower filler layer and an upper filler layer sequentially arranged from bottom to top; wherein, the upper filler layer is a ceramsite layer, the lower filler layer is a gravel layer, and the thickness of the upper filler layer is greater than the thickness of the lower filler layer.

[0014] Preferably, both ends of the aeration pipe are respectively connected with a first air pipe and a second air pipe, one end of the first air pipe far from the aeration pipe is connected to the gas supply device, and one end of the second air pipe far from the aeration pipe is closed;

[0015] Wherein, the aeration pipe, the first air pipe, the second air pipe and the gas supply device are all slidably connected to the purification pond and can reciprocally slide along the width direction of the purification pond.

[0016] Preferably, the sliding mechanism includes sliding grooves, the sliding grooves are arranged on the base layer and on the side walls of both sides of the purification pond along the width direction, all the sliding grooves are arranged in parallel and all extend along the width direction of the purification pond; the aeration pipe is slidably arranged on the sliding grooves on the base layer, and the first air pipe and the second air pipe are respectively slidably arranged on the sliding grooves on the side walls of both sides of the purification pond along the width direction.

[0017] Preferably, the aeration pipe, the first air pipe and the second air pipe are all connected with pulleys through a supporting plate, and the pulleys are slidably arranged in the corresponding sliding grooves;

[0018] And a plurality of cushion blocks are arranged at intervals along the length direction of the bottom of the sliding groove located on the base layer, and a space for the water collecting pipe to pass through is formed between adjacent cushion blocks.

[0019] Preferably, pointed heads are arranged on both sides of the aeration pipe along its length direction.

[0020] Preferably, a traction device is further included. One traction device is arranged at the top of each side wall of the purification tank along the width direction. The two traction devices are respectively connected to the first air pipe and the second air pipe, and can drive the first air pipe and the second air pipe to reciprocate along the width direction of the purification tank;

[0021] Any one of the traction devices includes a guiding platform, a lead screw, and an electric slider. The lead screw is rotatably arranged on the guiding platform, and the lead screw extends along the width direction of the purification tank. The electric slider is arranged on the lead screw and can reciprocate along the lead screw; the first air pipe and the second air pipe are respectively connected to the electric sliders of the two traction devices;

[0022] Wherein, the traction device connected to the first air pipe is further connected to the air supply device, and the air supply device is arranged on the electric slider of this traction device.

[0023] Preferably, a fixing bracket is arranged on each of the first air pipe and the second air pipe, and the fixing bracket is connected to the corresponding electric slider.

[0024] The present invention has achieved the following technical effects compared with the prior art:

[0025] An aeration device is arranged in the present invention, which can press air into the wetland main body, increasing the oxygen content inside the wetland and improving the purification effect inside the wetland; moreover, the aeration device is slidably arranged in the purification tank through a sliding mechanism, and by moving the aeration device, aeration can be carried out at different positions, so that only one set of aeration device is needed to aerate the entire wetland main body, reducing the project cost and conforming to the current concept of thrift and green development; moreover, during the movement of the aeration pipe, the internal structure of the filler layer will be continuously disturbed, keeping the filler layer with a certain porosity, maintaining the purification effect of the vertical subsurface flow wetland system, and improving its service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained according to these drawings.

[0027] Figure 1 This is a schematic diagram of the overall structure of the vertical subsurface flow wetland system in the embodiment of the present invention;

[0028] Figure 2 This is a schematic diagram of the internal structure of the purification tank in the embodiment of the present invention;

[0029] Figure 3 This is a schematic diagram of another angle of the internal structure of the purification tank in the embodiment of the present invention;

[0030] Figure 4 This is an exploded view of the structure of the sliding mechanism in the embodiment of the present invention;

[0031] Figure 5 This is a sectional view of the chute in the embodiment of the present invention;

[0032] Figure 6 This is a sectional view of the aeration pipe in the embodiment of the present invention.

[0033] In the figure: 1 - water distribution channel; 2 - second air pipe; 3 - water distribution pipe; 4 - cushion block; 5 - aquatic plants; 6 - aeration pipe; 7 - soil layer; 8 - base layer; 9 - mixed filler layer; 10 - water collection pipe; 11 - first air pipe; 12 - chute; 13 - water collection channel; 14 - guiding platform; 15 - lead screw; 16 - air compressor; 17 - electric slider; 18 - air inlet pipe; 19 - upper chord; 20 - ventilation hole; 21 - pointed head; 22 - pulley; 23 - support plate; 24 - lower chord. Detailed implementation manners

[0034] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0035] The purpose of the present invention is to provide a vertical subsurface flow wetland system to solve the problems existing in the prior art, which can improve the purification effect, extend the service life, and reduce the project cost.

[0036] To make the above objects, features, and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation manners.

[0037] Embodiment 1

[0038] As Figures 1 - 6As shown in the figure, in this embodiment, a vertical subsurface flow wetland system is provided, which mainly includes a wetland main body and an aeration device. Among them, the wetland main body includes a purification tank, in which a base layer 8, a filler layer and a soil layer 7 are sequentially arranged from bottom to top. The soil layer 7 is used for planting aquatic plants 5 (preferably reeds); the aeration device includes an air pipe 6 and a gas supply device. The air pipe 6 is located at the bottom of the filler layer, and ventilation holes 20 are arranged at the top of the air pipe 6. The gas supply device is connected to the air pipe 6 for supplying gas to the air pipe 6; among them, the aeration device is slidably arranged in the purification tank through a sliding mechanism.

[0039] In this embodiment, an aeration device is provided, which can press air into the wetland main body, increasing the oxygen content inside the wetland and improving the purification effect inside the wetland; moreover, the aeration device is slidably arranged in the purification tank through a sliding mechanism. By moving the aeration device, aeration can be carried out at different positions, so that only one set of aeration device is needed to aerate the entire wetland main body, reducing the project cost, which conforms to the current concept of thrift and green development; moreover, during the movement of the air pipe 6, the internal structure of the filler layer will be continuously disturbed, keeping the filler layer with a certain porosity, maintaining the purification effect of the vertical subsurface flow wetland system and improving its service life.

[0040] In this embodiment, the wetland main body further includes a collection channel 13 and a distribution channel 1. The distribution channel 1 is connected to the top of the purification tank through a distribution pipe 3 for supplying water to the purification tank; the collection channel 13 is connected to the bottom of the purification tank through a collection pipe 10 for recovering the water body in the purification tank; specifically, the distribution pipe 3 is arranged at the top of the purification tank, and the water inlet of the distribution pipe 3 is connected to the distribution channel 1, and the water outlet of the distribution pipe 3 is located at the top of the purification tank for water distribution; the collection pipe 10 is arranged at the bottom of the purification tank, and the water inlet of the collection pipe 10 is communicated with the bottom of the purification tank, and the water outlet is communicated with the collection channel 13.

[0041] As a preferred implementation manner, in this embodiment, the collection channel 13 and the distribution channel 1 are respectively located on both sides of the purification tank in the width direction and extend along the width direction of the purification tank; among them, it should be noted that, as Figure 1 shown, the direction perpendicular to the paper surface is the width direction of the purification tank.

[0042] In this embodiment, the filler layer is preferably a mixed filler layer 9, which includes a lower filler layer and an upper filler layer arranged in sequence from bottom to top; wherein, the upper filler layer is a ceramsite layer, which is laid by ceramsite with a particle size of 15 mm - 25 mm, and the lower filler layer is a gravel layer, which is laid by gravel with a particle size of 25 mm - 35 mm, and the thickness of the upper filler layer is greater than the thickness of the lower filler layer.

[0043] In this embodiment, the aeration pipe 6 extends along the length direction of the purification tank, and both ends of the aeration pipe 6 are respectively connected with a first air pipe 11 and a second air pipe 2. One end of the first air pipe 11 far away from the aeration pipe 6 is connected with the air supply device, and one end of the second air pipe 2 far away from the aeration pipe 6 is closed. The aeration pipe 6, the first air pipe 11, the second air pipe 2 and the air supply device are all slidably connected with the purification tank and can reciprocally slide along the width direction of the purification tank. Among them, the air supply device can be selected according to specific working needs, preferably an air compressor 16, or a compressed air tank or an air pump can also be selected.

[0044] In this embodiment, the sliding mechanism mainly includes a chute 12. The chute 12 is arranged on the base layer 8 and on both side walls of the purification tank along the width direction. The aeration pipe 6 is slidably arranged on the chute 12 on the base layer 8, and the first air pipe 11 and the second air pipe 2 are respectively slidably arranged on the chute 12 on both side walls of the purification tank along the width direction; wherein, all the chutes 12 are arranged in parallel and all extend along the width direction of the purification tank to ensure that the aeration pipe 6 can move smoothly inside the purification tank.

[0045] In this embodiment, a plurality of the chutes 12 are arranged on the base layer 8 and on both side walls of the purification tank along the width direction to ensure effective restraint and support for the aeration pipe 6, the first air pipe 11 and the second air pipe 2; wherein, the number of the chutes 12 can be selected according to specific working needs. For example, a chute 12 can be arranged below the middle and both ends of the aeration pipe 6, and two chutes 12 are arranged on both side walls of the purification tank along the width direction.

[0046] In this embodiment, the aeration pipe 6, the first air pipe 11 and the second air pipe 2 are all connected with pulleys 22 through a pallet 23, and the pulleys 22 are slidably arranged in the corresponding chutes 12, so that the aeration pipe 6, the first air pipe 11 and the second air pipe 2 can move; further, a plurality of pads 4 are arranged at intervals along the length direction of the bottom of the chute 12 on the base course 8, and a space for the water collecting pipe 10 to pass through is formed between adjacent pads 4, so as to ensure that the water collecting pipe 10 and the aeration pipe 6 can be reasonably arranged in space.

[0047] In this embodiment, the chute 12 is preferably an inverted T-shaped chute, and the width a of its notch is smaller than the minimum particle size of the packing in the mixed packing layer 9, so as to prevent the packing particles in the mixed packing layer 9 from entering the chute 12 and affecting the normal operation of the subsequent sliding mechanism; as a preferred embodiment, a = 14 mm.

[0048] In this embodiment, pointed heads 21 are arranged on both sides of the aeration pipe 6 along its length direction, so as to reduce the resistance suffered by the aeration pipe 6 when moving inside the purification tank.

[0049] In this embodiment, a traction device is further included. A traction device is arranged at the top of both side walls of the purification tank along the width direction. The two traction devices are respectively connected with the first air pipe 11 and the second air pipe 2, and can drive the first air pipe 11 and the second air pipe 2 to reciprocate along the width direction of the purification tank, so as to drive the entire aeration device to move.

[0050] Specifically, any one of the traction devices includes a guide platform 14, a lead screw 15 and an electric slider 17. The lead screw 15 is rotatably arranged on the guide platform 14, and the lead screw 15 extends along the width direction of the purification tank. The electric slider 17 is arranged on the lead screw 15 and can reciprocate along the lead screw 15; the first air pipe 11 and the second air pipe 2 are respectively connected with the electric sliders 17 of the two traction devices; further, the traction device connected with the first air pipe 11 is also connected with the air compressor 16. The air compressor 16 is arranged on the electric slider 17 of this traction device, and the air compressor 16 is communicated with the first air pipe 11 through an air inlet pipe 18. Through this traction device, the first air pipe 11 and the air compressor 16 can be driven to move together.

[0051] In this embodiment, it should be noted that the electric slider 17 is a conventional device in the art, which integrates driving devices such as a motor, and the motor can drive the electric slider 17 to reciprocate along the lead screw 15.

[0052] In this embodiment, a fixing bracket is provided on each of the first air pipe 11 and the second air pipe 2, and the fixing bracket is connected to the corresponding electric slider 17; wherein, the fixing bracket is preferably a triangular bracket, mainly including an upper chord 19 and two lower chords 24. The upper chord 19 extends along the width direction of the purification tank. The tops of the first air pipe 11 and the second air pipe 2 are respectively connected to the electric slider 17 through the corresponding upper chords 19. The tops of the two lower chords 24 are respectively connected to both ends of the corresponding upper chord 19, and the bottoms are connected to the first air pipe 11 or the second air pipe 2.

[0053] Further, it should be noted that other traction devices can also be selected according to work needs. For example, the traction device can include a guiding platform 14, a lead screw 15, a sliding table, a guide rail, and a servo motor. The lead screw 15 is rotatably provided on the guiding platform 14, and the lead screw 15 extends along the width direction of the purification tank. The guide rail is also provided on the guiding platform 14 along the width direction of the purification tank. The sliding table is slidably provided on the guide rail and is threadedly connected to the lead screw 15. The output shaft of the servo motor is connected to one end of the lead screw 15. By the servo motor, the lead screw 15 can be driven to rotate, and then the sliding table can be driven to reciprocate along the guide rail.

[0054] Alternatively, a hydraulic rod or a linear motor, etc. can also be used as the traction device to drive the aeration device to move.

[0055] The working process of the vertical subsurface flow wetland system in this embodiment is as follows:

[0056] When the tail water flows from the water distribution channel 1 into the purification tank through the water distribution pipe 3, first, the roots of the aquatic plants 5 absorb nutrients such as nitrogen and phosphorus in the tail water and provide a certain amount of oxygen for the microorganisms to promote the activities of aerobic microorganisms; then, the good pore structure of the mixed filler layer 9 is used to effectively filter the suspended particles and some organic pollutants in the tail water. The adsorption effect on the surface of the mixed filler layer 9 can also remove heavy metals and some nutrients in the sewage. Finally, the microorganisms attach to the surface of the mixed filler layer 9 to form a biofilm, and through various reactions, the organic matter, nitrogen, phosphorus and other pollutants in the tail water are further degraded and transformed. The treated tail water flows into the collection channel 13 through the collection pipe 10 and enters the next process.

[0057] After the entire vertical subsurface flow wetland system has been operating for some time, on the one hand, during the water purification process, suspended solids enter the mixed packing layer 9, resulting in a decrease in its porosity and clogging. On the other hand, the oxygen content inside the purification tank decreases due to various biochemical reactions, which has an adverse impact on the long-term water purification effect of the subsurface flow wetland. At this time, start the aeration device and the traction device. On the one hand, the air compressor 16 presses air into the first air pipe 11 through the air inlet pipe 18. Since the first air pipe 11, the aeration pipe 6, and the second air pipe 2 are interconnected, the air will enter the water in the form of bubbles through the ventilation holes 20 on the body of the aeration pipe 6. Some of the oxygen in the bubbles will dissolve in the water, increasing the oxygen content in the wetland system. On the other hand, the electric slider 17 will drive the first air pipe 11, the aeration pipe 6, and the second air pipe 2 to move slowly and reciprocally along the length direction of the lead screw 15. During the movement of the aeration pipe 6, it will continuously disturb the internal structure of the mixed packing layer 9, keeping the mixed packing layer 9 with a certain porosity and maintaining the purification effect of the vertical subsurface flow wetland system.

[0058] In the present invention, specific examples are used to illustrate the principle and implementation mode of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation mode and application scope. In summary, the content of this specification should not be construed as a limitation to the present invention.

Claims

1. A vertical subsurface flow wetland system, characterized in that: Comprising: The main body of the wetland, the main body of the wetland includes a purification pond, a base layer, a filler layer and a soil layer are sequentially arranged in the purification pond from bottom to top, and the soil layer is used for planting aquatic plants; An aeration device, the aeration device includes an aeration pipe and a gas supply device, the aeration pipe is located at the bottom of the filler layer, and ventilation holes are arranged on the aeration pipe, and the gas supply device is connected to the aeration pipe for supplying gas to the aeration pipe; wherein, the aeration device is slidably arranged in the purification pond through a sliding mechanism.

2. The vertical subsurface flow wetland system according to claim 1, wherein: The main body of the wetland further includes a water collection channel and a water distribution channel, the water distribution channel is connected to the top of the purification pond through a water distribution pipe for supplying water to the purification pond; the water collection channel is connected to the bottom of the purification pond through a water collection pipe for recovering the water body in the purification pond.

3. The vertical subsurface flow wetland system according to claim 2, characterized in that: The water collection channel and the water distribution channel are respectively located on both sides of the purification pond in the width direction and extend along the width direction of the purification pond.

4. The vertical subsurface flow wetland system according to claim 1, wherein: The filler layer is a mixed filler layer, including a lower filler layer and an upper filler layer arranged sequentially from bottom to top; wherein, the upper filler layer is a ceramsite layer, the lower filler layer is a gravel layer, and the thickness of the upper filler layer is greater than the thickness of the lower filler layer.

5. The vertical subsurface flow wetland system according to claim 2, wherein: Both ends of the aeration pipe are respectively connected with a first air pipe and a second air pipe, one end of the first air pipe far away from the aeration pipe is connected with the gas supply device, and one end of the second air pipe far away from the aeration pipe is closed; Wherein, the aeration pipe, the first air pipe, the second air pipe and the gas supply device are all slidably connected to the purification pond and can reciprocate along the width direction of the purification pond.

6. The vertical subsurface flow wetland system according to claim 5, characterized in that: The sliding mechanism includes a chute, the chute is arranged on the base layer and on both side walls of the purification pond along the width direction, all the chutes are arranged in parallel and all extend along the width direction of the purification pond; the aeration pipe is slidably arranged on the chute on the base layer, and the first air pipe and the second air pipe are respectively slidably arranged on the chutes on both side walls of the purification pond along the width direction.

7. The vertical subsurface flow wetland system according to claim 6, characterized in that: The aeration pipe, the first air pipe and the second air pipe are all connected with pulleys through a support plate, and the pulleys are slidably arranged in the corresponding chutes; And a plurality of cushion blocks are arranged at intervals along the length direction of the bottom of the chute on the base layer, and a space for the water collection pipe to pass through is formed between adjacent cushion blocks.

8. The vertical subsurface flow wetland system according to claim 7, characterized in that: Both sides of the aeration pipe along its length direction are provided with pointed heads.

9. The vertical subsurface flow wetland system according to claim 6, characterized in that: Further comprising a traction device, a traction device is arranged on the top of both side walls of the purification pond along the width direction, and the two traction devices are respectively connected with the first air pipe and the second air pipe and can drive the first air pipe and the second air pipe to reciprocate along the width direction of the purification pond; Any one of the traction devices includes a guiding platform, a lead screw and an electric slider, the lead screw is rotatably arranged on the guiding platform, and the lead screw extends along the width direction of the purification pond, the electric slider is arranged on the lead screw and can reciprocate along the lead screw; the first air pipe and the second air pipe are respectively connected with the electric sliders of the two traction devices; Among them, the traction device connected to the first trachea is also connected to the air supply device, and the air supply device is arranged on the electric slider of the traction device.

10. The vertical subsurface flow wetland system according to claim 9, characterized in that: A fixed bracket is arranged on both the first trachea and the second trachea, and the fixed bracket is connected to the corresponding electric slider.

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