CN210150812U - Three-dimensional vertical rotation undercurrent artificial wetland device - Google Patents
Three-dimensional vertical rotation undercurrent artificial wetland device Download PDFInfo
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- CN210150812U CN210150812U CN201921049253.2U CN201921049253U CN210150812U CN 210150812 U CN210150812 U CN 210150812U CN 201921049253 U CN201921049253 U CN 201921049253U CN 210150812 U CN210150812 U CN 210150812U
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Abstract
The utility model discloses a three-dimensional vertical rotation undercurrent constructed wetland device. The device comprises a water inlet and distribution area, a water treatment area, a water outlet and distribution area and a support column. The water inlet and distribution area is composed of a water distribution area inner side baffle, a water distribution area transverse baffle, a water distribution area outer side baffle, a water inlet and distribution area bottom plate and a water inlet and distribution area water level adjusting plate enclosure; the water treatment area consists of a water treatment area inner side baffle, a water treatment area outer side baffle, a water level adjusting plate and a water treatment area bottom plate; the water treatment area is of a vertical spiral structure; the structure and the size of the water outlet and distribution area are the same as those of the water inlet and distribution area; the support columns are hollow columns with rectangular cross-sectional areas, and 4 support columns are averagely arranged according to a 360-degree annular array. The utility model provides a new constructed wetland structural style has area is few, embodies constructed wetland's hydrophilicity and ecological landscape function, increased constructed wetland rivers along journey length, improved pollution load and plant biomass, realized the source of sewage to administer and retrieval and utilization nearby betterly.
Description
Technical Field
The invention belongs to the field of artificial wetlands, and particularly relates to a three-dimensional vertical rotary subsurface flow artificial wetland device for advanced treatment of domestic sewage in residential concentration areas, water quality improvement and water environment restoration.
Background
The constructed wetland ecological treatment system utilizes the principles of species symbiosis and material cycle regeneration in the ecological system, adheres to the principle of structure and function coordination, fully exerts the regeneration potential of resources on the premise of promoting the virtuous cycle of pollutants in sewage, and obtains the best benefits of sewage treatment and resource utilization while improving the water environment quality. The constructed wetland treatment system has the characteristics of large buffer capacity, good treatment effect, simple process, investment saving, low operating cost and the like, and is very suitable for sewage treatment of medium and small towns.
The artificial wetland system is one of important ecological treatment technologies in the current water environment pollution prevention system, but the artificial wetland has the defects of low pollution load, large floor area, insufficient landscape function and the like. Because the constructed wetland needs a large amount of idle land to be arranged, the constructed wetland is not suitable for being developed in the central area of a dense-population urban area with a short land, but only can be used for site selection in suburbs around the urban area with a large area and is far away from a sewage generating area, so that the sewage collecting and conveying cost and the sewage leakage amount and risk are increased, and meanwhile, if the treated water is recycled, the general recycling points are more in urban population gathering areas, and the construction cost of a recycling pipe network is further increased. The traditional artificial wetland is far away from the areas where people live and move, so that the hydrophilic property and the ecological landscape function of the artificial wetland are difficult to realize and exert fully. How to improve the pollution load of the artificial wetland from the structural design of the artificial wetland and further improve the purification efficiency of pollutants of the artificial wetland is an important subject for promoting the further large-scale application of the artificial wetland and expanding the application of the artificial wetland as an important water environment ecological management technology.
Disclosure of Invention
Aiming at the problems of the existing artificial wetland ecological treatment technology, the invention provides an artificial wetland system which develops from the ground to the space, increases the pollution load, the plant biomass and the removal load of the unit ground and embodies the ecological landscape function by taking the design concept of a three-dimensional flower wall in a garden process as reference.
The object of the present invention can be achieved by the following means.
A three-dimensional vertical rotary subsurface flow constructed wetland device comprises a water inlet distribution area at the front end of the upper part, a water treatment area in the middle part and a water outlet distribution area at the tail end of the bottom part. The water distribution area of intaking and the district of joining in marriage of going out water are last open cuboid spatial structure, the water treatment district is the open vertical helical structure in top, the water treatment district is connected through the water level adjusting plate in the district of joining in marriage of intaking with the district of joining in marriage of intaking, the water treatment district is connected through the water level adjusting plate in the district of joining in marriage of going out water with the district of joining in marriage of going out water, be provided with the water level adjusting plate in the water treatment district, the district of joining in marriage of intaking, the bottom in water treatment district and the district of joining in marriage of going out water is supported by the angle brace on.
The water inlet and distribution area is composed of a water inlet and distribution area inner side baffle, a water inlet and distribution area transverse baffle, a water inlet and distribution area outer side baffle, a water inlet and distribution area bottom plate and a water inlet and distribution area water level adjusting plate surrounding baffle.
The inner side baffle of the water inlet distribution area, the transverse baffle of the water inlet distribution area, the outer side baffle of the water inlet distribution area and the bottom plate of the water inlet distribution area are rectangular plane thin plates. The water inlet pipe is arranged at the inner side baffle of the water inlet and distribution area.
The water treatment area consists of a water treatment area inner side baffle, a water treatment area outer side baffle, a water treatment area water level adjusting plate and a water treatment area bottom plate, wherein the water treatment area inner side baffle and the water treatment area outer side baffle are vertical and vertical spiral space curved surface thin plates respectively, and the water treatment area bottom plate is a horizontally placed spiral space curved surface thin plate.
The cross section of the spiral structure is an open rectangle vertically placed, the number of layers of the spiral is 3, the height difference between the layers of the spiral structure is equal to the height of the cross section of the spiral structure, the diameter of the bottom surface of the spiral structure is equal to the diameter of the top surface of the spiral structure, and the diameter of the spiral structure is 3 times to 5 times of the width of the cross section of a water treatment area.
4 water treatment area water level adjusting plates are uniformly arranged on each layer of the water treatment area, and the total number of the water treatment area water level adjusting plates is 12.
The water outlet and distribution area and the water inlet and distribution area are the same in structure and size and are of a cuboid three-dimensional structure with an upper opening, and the cuboid three-dimensional structure is formed by an outer baffle of the water outlet and distribution area, a transverse baffle of the water outlet and distribution area, an inner baffle of the water outlet and distribution area, a bottom plate of the water outlet and distribution area and a water level adjusting plate of the water outlet and distribution area.
And a water outlet pipe is arranged at the inner side baffle of the water outlet and distribution area.
And the bottom of the bottom plate of the water outlet and distribution area is provided with a vent pipe, and the position of the vent pipe is positioned at the central part of the bottom plate.
The water level adjusting plate of the water inlet distribution area, the water level adjusting plates of the water treatment areas and the water level adjusting plate of the water outlet distribution area are rectangular thin plates, have the same size and structure and are provided with water through holes.
The water passing holes are formed by three rows of round holes, the lowest row of holes is located at four fifths of the height of the water level adjusting plate, and the area of the water passing holes is about 1% -5% of that of each water level adjusting plate.
The support columns are hollow columns with rectangular cross sectional areas, the support columns are arranged on the inner side of the baffle close to the inner side of the water treatment area, 4 support columns are evenly arranged according to 360-degree annular arrays, namely the included angle between the support columns is 90 degrees, and the height of the 4 support columns is set according to the height of the spiral structure of the water treatment area.
The supporting columns support the water treatment area bottom plate through the angle braces, the cross sections of the components of the angle braces are groove-shaped, and the components are triangular after being connected and are tightly connected with the supporting columns. The angular supports are arranged according to 360 degrees on average in 4 per layer of spiral structure, and the total number is 12.
Compared with the prior art, the invention has the following advantages:
(1) a novel constructed wetland structure. The invention is different from the traditional horizontal subsurface flow and vertical subsurface flow constructed wetlands, but takes the advantages of the horizontal subsurface flow and the vertical subsurface flow constructed wetlands, is a flow state between the horizontal subsurface flow and the vertical subsurface flow, and is a novel constructed wetland structure.
(2) The occupied area is small. The invention uses the design concept of spiral stairs for reference, arranges the artificial wetland in a spiral upward way, and reduces the floor area compared with the traditional artificial wetland.
(3) Increasing the pollution load and the removal load. The pollution load and removal load of the unit ground area of the artificial wetland are increased under the premise of reducing the occupied area, the same water inlet condition and the same removal efficiency.
(4) The plant biomass is increased. The vertical spiral design of the artificial wetland changes the single-layer planting state of the aquatic plants of the traditional artificial wetland, and the aquatic plants are planted in the spiral direction, so that the multilayer accumulation of plant biomass is realized, and the advantage of the plant in removing the pollutants of the artificial wetland is better exerted.
(5) The on-way length of the artificial wetland is increased. The increase of the on-way length of the artificial wetland is beneficial to providing hydraulic retention time, increasing the sludge age of microorganisms, improving the biodiversity and enabling the tail part of the artificial wetland to be in the endogenous respiration period of the microorganisms, thereby improving the quality of water quality and effluent.
(6) Fully presents the function of ecological landscape. The invention has the advantages that the occupied area is small, the arrangement in residential concentration areas is possible, the ecological landscape function of the artificial wetland is realized by the plant breeding and configuration by taking the plant flower wall design as a reference, and the environmental friendliness of the artificial wetland is intuitively reflected while the water purification efficiency is enhanced.
(7) Realizes the source treatment and the nearby recycling of the sewage. Because this work has the advantage that area is less, can get into crowd's residence and arrange to realize the source of sewage and handle, the sewage after the processing can be discharged nearby and the retrieval and utilization, has saved the construction cost of rain sewage collection and defeated system of transshipment, has alleviateed the threat of pipe network seepage to the environmental pollution of earth's surface and groundwater.
Drawings
Fig. 1 is a top view of a three-dimensional vertical rotary subsurface flow constructed wetland device of the invention.
Fig. 2 is a front view of a three-dimensional vertical rotary subsurface flow constructed wetland device of the invention.
Fig. 3 is a side view of a three-dimensional vertical rotary subsurface flow constructed wetland device of the invention.
Fig. 4 is a sectional view of fig. 1 through 1.
Fig. 5 is a cross-sectional view 2-2 of fig. 1.
Fig. 6 is a schematic view of point a in fig. 4.
Fig. 7 is a schematic view of point B in fig. 4.
Fig. 8 is a view showing a large scale of point C in fig. 4.
Detailed Description
The following are specific embodiments of the present invention and are further described with reference to fig. 1 to 8, but the present invention is not limited to these embodiments.
A three-dimensional vertical rotary subsurface flow constructed wetland device comprises a water inlet distribution area 1 at the front end of the upper part, a water treatment area 2 in the middle part and a water outlet distribution area 3 at the tail end of the bottom part. Intake water distribution area 1 and play water distribution area 3 are last open cuboid spatial structure, water treatment area 2 is the open vertical helical structure in top, water treatment area 2 is connected through the water level adjusting plate 61 that intakes water distribution area 1 with intake water distribution area, water treatment area 2 is connected through play water distribution area water level adjusting plate 63 with play water distribution area 3, be provided with the water level adjusting plate in water treatment area, intake water distribution area 1, water treatment area 2 and the bottom of play water distribution area 3 are supported by angle brace 41 on support column 4.
The water inlet distribution area 1 is of a cuboid three-dimensional structure with an opening in the upper part and is formed by surrounding baffles of a water inlet distribution area inner side baffle 11, a water inlet distribution area transverse baffle 12, a water inlet distribution area outer side baffle 13, a water inlet distribution area bottom plate 14 and a water inlet distribution area water level adjusting plate 61, and all the baffles are connected in a sealing mode. The water inlet distribution area inner side baffle plate 11, the water inlet distribution area transverse baffle plate 12, the water inlet distribution area outer side baffle plate 13 and the water inlet distribution area bottom plate 14 are rectangular plane thin plates, and a water inlet pipe 15 is arranged at the water inlet distribution area inner side baffle plate 11 of the water inlet distribution area 1.
The water treatment area 2 is composed of a water treatment area inner side baffle 21, a water treatment area outer side baffle 22, a water treatment area bottom plate 23 and a water treatment area water level adjusting plate 62, and the enclosure baffles are all tightly connected with one another. The inner side baffle plate 21 and the outer side baffle plate 22 of the water treatment area are vertical and vertical spiral space curved surface thin plates respectively, and the bottom plate 23 of the water treatment area is a horizontally arranged spiral space curved surface thin plate. The water treatment area 2 is vertical helical structure, and helical structure's transversal section is the vertically open rectangle, and helical structure's the number of piles is 3 layers, and the difference in height between helical structure layer and the layer equals with helical structure's cross section's height, and the bottom surface diameter and the top surface diameter of spiral are equal, and its diameter is 3 times ~5 times of 2 cross section widths in water treatment area. The water treatment area 2 is connected with the water inlet and distribution area 1 through a water inlet and distribution area water level adjusting plate 61. 4 water treatment zone level adjusting plates 62 are provided in each floor of the water treatment zone 2, and the total number is 12.
The structure and the size of the water outlet distribution area 3 are the same as those of the water inlet distribution area 1, the water outlet distribution area is also of a cuboid three-dimensional structure with an opening at the upper part, and the water outlet distribution area is formed by enclosing baffles of an inner baffle 31 of the water outlet distribution area, a transverse baffle 32 of the water outlet distribution area, an outer baffle 33 of the water outlet distribution area, a bottom plate 34 of the water outlet distribution area and a water level adjusting plate 63 of the water outlet distribution area, and all the baffles are connected in a sealing way. The water outlet pipe 35 is arranged at the inner side baffle 31 of the water outlet distribution area 3, and the position of the water outlet pipe 35 is positioned at the central part of the inner side baffle 31. And a vent pipe 36 is arranged at the bottom of the bottom plate 34 of the water outlet and distribution area 3, and the position of the vent pipe 36 is positioned at the central part of the bottom plate.
The water inlet distribution area water level adjusting plate 61, each water treatment area water level adjusting plate 62 and the water outlet distribution area water level adjusting plate 63 are rectangular thin plates, the sizes and the structures of the water inlet distribution area water level adjusting plate, the water passing holes 621 are arranged, each water passing hole 621 is composed of three rows of circular holes, and the lowest row of holes is located in four fifths of the water inlet distribution area water level adjusting plate 61, each water treatment area water level adjusting plate 62 and the water outlet distribution area water level adjusting plate 63. The holes of the water holes 621 are distributed in a staggered manner, and the ratio of the hole area of the water holes 621 on the water inlet distribution area water level adjusting plate 61, the water treatment area water level adjusting plate 62 and the water outlet distribution area water level adjusting plate 63 to the plate area of the water inlet distribution area water level adjusting plate 61, the water treatment area water level adjusting plate 62 and the water outlet distribution area water level adjusting plate 63 is about 1% -5%.
The support columns 4 are hollow columns with rectangular cross sectional areas, the support columns 4 are arranged on the inner side of the baffle 21 close to the water treatment area, 4 support columns are evenly arranged according to a 360-degree annular array, and the included angle between the support columns 4 is 90 degrees. The height of the 4 support columns 4 is set according to the height of the spiral structure of the water treatment zone 2. The bottom end of the support column 4 extends out of the bottom plate 34 of the water distribution area for a certain distance to ensure the installation space of the emptying pipe 36. The supporting column 4 supports the water treatment area bottom plate 23 through a corner support 41, the cross section of a component of the corner support 41 is in a groove shape, and the component is triangular after being connected and is tightly connected with the supporting column 4. The angular supports 41 are arranged on average 4 per layer of the helical structure by 360 °, for a total of 12.
In addition, the main body (the water inlet distribution area 1, the water treatment area 2 and the water outlet distribution area 3) can be molded by PE, PVC or PPP materials with the thickness of 8-10 mm, and can also be welded by stainless steel plate metal plates with the thickness of 1-3 mm, so that the pollution to water quality is avoided. The cross sections of the water inlet distribution area/1, the water treatment area 2 and the water outlet distribution area 3 are 500-700 mmmm in height and 400-500 mm in width, and the lengths of the water inlet distribution area 1 and the water outlet distribution area 3 are 300-500 mm. The diameter of the spiral structure of the water treatment area 2 is 2500-3000 mm, and the height is 3500-3700 mm. The diameter of the inlet pipe 15 and the outlet pipe 35 is 100 mm. The thickness of the water level adjusting plate 61 of the water inlet distribution area, the water level adjusting plate 62 of the water treatment area and the water level adjusting plate 63 of the water outlet distribution area can be PE, PVC or PPP plates of 5 mm-10 mm, or stainless steel plates of 1 mm. The diameter of the water passing hole 621 is 10 mm. The supporting columns 4 and the angle braces 41 are made of stainless steel with the thickness of 2mm, wherein the cross section of the supporting columns 4 is 150mm multiplied by 150mm, the height of the supporting columns is different according to the height of each section of the water treatment area, and the range of the height is 2200 mm-3200 mm. The gusset 41 has a width of 100mm, a length of 600mm and a height of 400 mm.
The working principle of the invention is as follows:
(1) the place of placement. The invention is suitable for the secondary or advanced treatment of domestic sewage, can be placed in streets, squares, riverway side banks or residential areas, and can be discharged nearby or reused for flushing toilets, greening, car washing or building water and the like after the treated water reaches the discharge or reuse standard.
(2) And filling the matrix. After the assembly of the invention is finished, the water inlet and distribution area 1, the water treatment area 2 and the water outlet and distribution area 3 are respectively filled with matrixes or matrix combinations with different materials and specifications, for example, the matrixes which can be filled according to different treatment purposes of nitrogen and phosphorus removal, organic matter removal, suspended matter removal and the like comprise gravels, pebbles, zeolites, volcanic rocks, iron ores, and even solid carbon sources such as plant fallen leaves, crop straws and the like. The filling height of the substrate is preferably 400-450 mm, namely the distance from the upper edge of the water inlet distribution area 1, the water treatment area 2 or the water outlet distribution area 3 is 50-100 mm.
(3) And (5) planting aquatic plants. The aquatic plants should be selected mainly from local plants to increase the adaptability of the plants, and aquatic plants with large biomass should be properly considered. The aquatic plant can be rhizoma Acori Calami, rhizoma Typhae, herba plantaginis, rhizoma Phragmitis, canna indica, etc. The soil of the root system of the plant is planted in the substrate after being cleaned, and water is immediately filled into the water inlet and distribution area 1, the water treatment area 2 and the water outlet and distribution area 3. In the beginning period of the aquatic plant, water can be intermittently fed, and nutrient solution can be prepared, and in the later period, the water feeding frequency can be gradually increased until the nutrient solution is replaced by the sewage to be treated, so as to achieve the purpose of domesticating the plant and the microorganism in the substrate. If the sewage can not be lifted to the water inlet distribution area 1, a water inlet lifting pump needs to be configured to meet the water pressure requirement of inlet water.
(4) And (5) starting. In the beginning period, water can be intermittently fed, after the aquatic plants are in the adaptation period, nutrient solution can be prepared, and then the water feeding frequency can be gradually increased. And finally, replacing nutrient solution with the sewage to be treated to feed water into the system so as to achieve the aim of domesticating the microorganisms in the plants and the matrix, and simultaneously, starting to monitor the quality of the inlet and outlet water. After the effluent quality is stable, the starting stage of the invention can be considered to be finished. If the sewage can not be lifted to the water inlet distribution area 1, a water inlet lifting pump needs to be configured to meet the water pressure requirement of inlet water.
(5) And (5) operating. The purpose of changing pollution load can be achieved by adjusting the water inflow and changing the hydraulic retention time according to different effluent quality standards and the change of the environmental temperature, so that the effluent meets the requirements. For sewage with lower carbon content in the inlet water quality, the demand of the denitrification process for denitrification on the carbon source can be met by means of multi-point water inlet, liquid phase or solid phase carbon source increase and the like.
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.
Claims (10)
1. The utility model provides a three-dimensional vertical rotation undercurrent constructed wetland device, includes the water distribution district that intakes of upper portion front end, be in the water treatment district at middle part, be in the terminal water distribution district that goes out of bottom, its characterized in that: the water distribution area of intaking and the district of joining in marriage of going out water are the open cuboid spatial structure in top, the water treatment district is the open vertical helical structure in top, the water treatment district is connected through the water level adjusting plate in the district of joining in marriage of intaking with the district of joining in marriage of intaking, the water level adjusting plate that the district of joining in marriage of water is connected through the district of joining in marriage of going out water in the water treatment district with the district of joining in marriage of going out water in the water treatment district, be provided with the water level adjusting plate in the water treatment district, the district of joining in marriage of intaking, the bottom in water treatment district and the.
2. The vertical rotary subsurface flow constructed wetland device according to claim 1, characterized in that: the water inlet and distribution area is composed of a water inlet and distribution area outer side baffle, a water inlet and distribution area transverse baffle, a water inlet and distribution area inner side baffle, a water inlet and distribution area bottom plate and a water level adjusting plate surrounding baffle of the water inlet and distribution area.
3. The vertical rotary subsurface flow constructed wetland device according to claim 2, characterized in that: the water inlet distribution area inner side baffle, the water inlet distribution area transverse baffle, the water inlet distribution area outer side baffle and the water inlet distribution area bottom plate are all rectangular plane thin plates.
4. The vertical rotary subsurface flow constructed wetland device according to claim 2, characterized in that: the water inlet pipe is arranged at the inner side baffle of the water inlet and distribution area.
5. The vertical rotary subsurface flow constructed wetland device according to claim 1, characterized in that: the water treatment area comprises water treatment district inside board, water treatment district lateral baffle, water treatment district water level regulating plate and water treatment district bottom plate, and water treatment district inside board and water treatment district lateral baffle are vertical vertically spiral space curved surface sheet metal respectively, and water treatment district bottom plate is the spiral space curved surface sheet metal that the level was placed.
6. The vertical rotary subsurface flow constructed wetland device according to claim 1, characterized in that: the cross section of the spiral structure is an open rectangle vertically placed, the number of layers of the spiral is 3, the height difference between the layers of the spiral structure is equal to the height of the cross section of the spiral structure, the diameter of the bottom surface of the spiral structure is equal to the diameter of the top surface of the spiral structure, and the diameter of the spiral structure is 3-5 times of the width of the cross section of the water treatment area.
7. The vertical rotary subsurface flow constructed wetland device according to claim 6, characterized in that: and 4 water level adjusting plates of the water treatment area are uniformly arranged on each layer of the water treatment area.
8. The vertical rotary subsurface flow constructed wetland device according to claim 1, characterized in that: the water outlet distribution area and the water inlet distribution area are identical in structure and size and are formed by an outer baffle of the water outlet distribution area, a transverse baffle of the water outlet distribution area, an inner baffle of the water outlet distribution area, a bottom plate of the water outlet distribution area and a water level adjusting plate of the water outlet distribution area, a water outlet pipe is arranged at the inner baffle of the water outlet distribution area, an emptying pipe is arranged at the bottom of the bottom plate of the water outlet distribution area, and the emptying pipe is positioned at the center of the bottom plate.
9. The vertical rotary subsurface flow constructed wetland device according to claim 1, characterized in that: the water level adjusting plate of the water inlet distribution area, the water level adjusting plate of the water treatment area and the water level adjusting plate of the water outlet distribution area are rectangular thin plates, the sizes and the structures of the water level adjusting plates are the same, water passing holes are formed in the water passing holes, the water passing holes are formed in three rows of round holes, the lowest row of holes are located at four fifths of the height of each water level adjusting plate, and the hole area of each water passing hole is about 1% -5% of the ratio of the hole area of each water level adjusting plate to the hole area of each water passing.
10. The vertical rotary subsurface flow constructed wetland device according to claim 1, characterized in that: the support column be the hollow stand of cross-sectional area for the rectangle, the support column is arranged and is being close to water treatment district inboard side, arranges 4 on average according to 360 annular array, and the contained angle between the support column is 90 promptly, the height of 4 support columns highly sets up according to the helical structure in water treatment district, the support column passes through the angle brace and supports water treatment district bottom plate, and the cell type is personally submitted to the component cross section of angle brace, is triangle-shaped behind the component connection to with support column zonulae occludens, the angle brace arranges 4 on average according to 360 every layer of helical structure.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921049253.2U CN210150812U (en) | 2019-07-08 | 2019-07-08 | Three-dimensional vertical rotation undercurrent artificial wetland device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921049253.2U CN210150812U (en) | 2019-07-08 | 2019-07-08 | Three-dimensional vertical rotation undercurrent artificial wetland device |
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| CN210150812U true CN210150812U (en) | 2020-03-17 |
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| CN201921049253.2U Expired - Fee Related CN210150812U (en) | 2019-07-08 | 2019-07-08 | Three-dimensional vertical rotation undercurrent artificial wetland device |
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