KR101556669B1 - Upward flow type terraced filtering wetland - Google Patents

Abstract

The present invention relates to an artificial subsurface-flow wetland which is connected to a plurality of unit treating tanks (10) where plant materials (30) is mounted on an upper portion by multi-stage. The present invention spreads a light medium (20) inside the unit treating tanks (10), installs a container (50) where plant materials (30) are loaded on tan upper portion, forms an upward flow in treating water of the inner unit treating tanks (10) and purifies them in order that the filtered treating water through the light medium (20) comes into contact with purification plants of the container (50) and blocks back wash water into the container (50) when back wash of the light medium (20) because of being possible to open and close a lower plate of the container (50). A lower spray hole (15) and an upper portion (16) is respectively formed on an upper and lower portion of the unit treating tanks (10). The present invention can promote flowage of the light medium (20) through forming spiral flow inside the unit treating tanks (10) by spraying compressed air or back wash water when back wash. The present invention can basically solve a chronic problem of a conventional artificial subsurface-flow wetland when operating back wash of the medium and can maintain functions of subsurface-flow wetland and semipermanently use the medium because of blocking secondary pollution of plant materials (30) and purification plants and thus can drastically reduce operation cost of subsurface-flow wetland as well as improving processing performance of subsurface-flow wetland and maintenance convenience.

Description

{UPWARD FLOW TYPE TERRACED FILTERING WETLAND}

The present invention relates to an artificial wetland type filter bed in which a plurality of unit treatment tanks 10 provided with a vegetation material 30 at the upper portion thereof are coupled and connected in a multi-stage manner. In the unit treatment tank 10, A loading box 50 on which the vegetation material 30 is placed is installed on the upper part of the unit treatment tank 10 and an upward flow is formed on the treated water in the unit treatment tank 10, The backwashing of the lightweight filter medium 20 is performed by cleaning the filtered water passing through the filter medium 20 in contact with the purifying plant of the loading box 50 so that the bottom plate of the loading box 50 can be opened and closed. The lower jetting port 15 and the upper jetting port 16 are formed on the lower and upper sides of the unit treatment tank 10 and the compressed air or the backwash water is sprayed upon backwashing, The flow of the lightweight filter medium 20 can be promoted by forming a swirling flow inside the treatment tank 10.

Wetland remnants (ie, wetlands) are facilities that perform physical filtration and wetland functions simultaneously. They are designed to treat wastewater, treat nonpoint pollution sources, improve river water quality, provide biological habitats, and create a hydrophilic environment.

Wastewater treatment by wetland is applied to various fields such as industrial wastewater such as urban sewage, combined sewer water, dairy wastewater, landfill leachate, hospital wastewater, etc. and treatment of pollutants originating from nonpoint source such as storm water and runoff water And is particularly attracting attention as a non-point pollution source treatment facility.

Wetlands can be composed of a single wetland or a combination of various types of unit wetlands. The combined wetland landscapes are composed of a number of unit wetlands with different operating levels in a staircase, The retention time and the retention path are extended to ensure the purification treatment efficiency. As a related art, Japanese Patent No. 459503 is cited.

Conventional multi-stage wetland wastewater including patent No. 459503 is formed by connecting unit wastewater, that is, treatment wastewater in a stepwise manner. In each treatment wastewater, a filter material such as soil or crushed stone is installed, and a structure in which plants are planted , And the treated water treated through the entire unit wetland is firstly introduced into the uppermost treatment tank, and then the treated water is sequentially passed through the subsequent treatment tank.

The treated water in the multistage wetland is filtered while passing through the particulate filter media installed in the treatment tank, and then purified while being in contact with the planted plants. Especially, in such multi-stage wetland filtration, Horizontal flow) as well as a vertical phase flow, so that it is advantageous to utilize the entire cross-sectional area of the treatment tank for the filtration treatment.

As described above, the conventional multistage wetland filter can obtain many advantages in terms of the space utilization as well as the purification effect of the treated water. However, when the pollutants are deposited on the filter media for a long period of operation, the treatment effect is drastically reduced and the practical function is lost. there was.

In order to solve such a problem, as in the case of a conventional filtration type water treatment facility, a countermeasure for artificially inducing a reverse flow of the treated water flow in the usual way or injecting backwash water to separate and remove contaminants deposited in the filter media However, in the multistage wetland treatment tank, the forward flow of the treatment water flow is upward. In order to backwash the high-pressure backwash water should be injected from the upper side of the treatment tank. In this process, There is a problem that it is difficult to recover the injected backwash water and the washed contaminants.

Therefore, it is possible to consider a method in which a filter is installed in advance of the treatment tank and a filter material is installed in advance, and the reverse water is supplied upward, that is, in the forward direction of the normal treatment water flow, This is not in agreement with the preliminary meaning of backwash that supplies reverse osmosis water in the reverse direction of the treatment water flow, but it can be considered as a significant solution in view of the substantial removal effect of the deposited contaminants in the filtering medium. However, The serious contamination side effects of the plants planted with the pollutants in the stationary water discharged into the vegetation material 30 are caused.

As the upper part vegetation material 30 for treatment of wetland wastes, an expensive functional vegetation material 30 including a natural fiber-based vegetation material 30 such as coir fiber is applied, and these vegetation materials 30, If the contaminants are deposited in the fibrous vegetation, it is practically impossible to remove them, so that the entire vegetation material 30 must be replaced, and the planting and cultivation of the purified plants must be repeated.

Therefore, if the function of the filter material is lost due to the deposition of the contaminants, the function of the wetland filter is maintained by removing the existing filter material and installing a new filter material. Not only the replacement of the filter media itself but also the disposal of the waste filter material and the restoration of the upper vegetation are costly and there is a serious problem accompanied by a long-term operation interruption.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems, and it is an object of the present invention to provide a unit treatment tank in which a plurality of unit treatment tanks 10, in which a filter material is loaded and a vegetation material 30 is installed, The upper injection opening 16 is provided in the upper part of the inside of the unit treatment tank 10 and the injection direction of the lower injection opening 15 and the injection direction of the upper injection opening 16, The swirling flow of the treated water in the unit treatment tank 10 is generated as the compressed air or backwash water is supplied to the lower jet opening 15 and the upper jet opening 16, An inlet 13 into which the process water flows is formed in a lower portion of the one side wall 11 of the unit treatment tank 10 and a lightweight filter medium 20 for filtering contaminants in the treatment water is loaded in the unit treatment tank 10, The water is filtered while passing through the lightweight filter medium 20, A loading box 50 is installed on the upper part of the cabinet 10 and a plurality of water holes 51 are formed in the bottom plate at regular intervals to form a light weight filter media 20 And the discharge port 71 connected to the discharge valve 72 is formed in the upper part of the unit treatment tank 10 so that the lightweight filter medium 20 is discharged from the unit treatment tank 10, The discharge valve 72 is opened to discharge the backwash water in the unit treatment tank 10 and a plurality of incision openings 56 are formed in the outer bottom surface of the loading chamber 50 in the water supply hole 51, In the state where the incision opening 56 and the water supply hole 51 are overlapped with each other so that the open / close plate 55 formed at the same interval as the incision opening 56 and the water supply hole 51 are overlapped, And the opening and closing plate 55 is moved so that the incision opening 56 is spaced apart from the water supply hole 51. In this case, Is an upflow type multistage wetland restoration that is characterized by being blocked.

A floatation restraining plate 40 for passing treatment water through the lightweight filter medium 20 of the unit treatment tank 10 and blocking the floating of the lightweight filter medium 20 is provided on the wall of the unit treatment tank 10, (45) is provided on one side wall (11) of the unit treatment tank (10) with an active roller (47) mounted on the lower side thereof, And a slanting action groove 42 is formed at an upper portion of one side of the floatation restraining plate 40. The active roller 47 is coupled to the slanting action groove 42, Wherein the lifting lever 45 is rotated so that the lifting plate 40 is lifted and lowered while the active roller 47 is traveling along the slanting action groove 42. [

Through the present invention, it is possible to fundamentally solve the problems in the backwashing operation of the filter media, which has been a maintenance problem in the conventional artificial wetland type filter, and can solve the problems of the vegetation material 30 and the purification It is possible to use the semi-permanent use of the filter media while maintaining the function of the wetland filter perfectly, thereby remarkably improving the treatment performance and maintenance convenience of the wetland filter, Operating costs can also be drastically reduced.

The lightweight filter medium 20 is applied so that the lightweight filter medium 20 vibrates or floats when the aeration or backwash water is supplied through the air diffuser. 10 and the lower jet opening 15 and the upper jet opening 16 are provided in the lower part and the upper part of the unit treatment tank 10 to spray the compressed air or the backwash water to induce the swirling flow in the unit treatment tank 10 to dramatically improve the backwash effect .

In addition, it is also possible to provide a flotation-restraining plate 40 capable of adjusting the pressing state of the light-weight filter medium 20 so as to maximize the filtration effect while maintaining a tightly stacked state of the light- The filtration efficiency and the backwashing effect can be secured at all by ensuring free flow of the lightweight filter medium 20 by releasing the pressing state of the lightweight filter medium 20.

BRIEF DESCRIPTION OF THE DRAWINGS FIG.
2 is a partial cutaway perspective view of the present invention
Fig. 3 is an exploded perspective view of the piping related to the present invention
Fig. 4 is an exploded perspective view of the backwash-
Fig. 5 is an exploded perspective view of the main part of the present invention.
6 is a longitudinal sectional view of the present invention
Figure 7 is a graphical representation of the operational state representative section of the present invention
FIG. 8 is a schematic cross-sectional view
Fig. 9 is an explanatory diagram of the operation of the flotation plate of the present invention

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be described in detail with reference to the accompanying drawings.

1 is a perspective view showing an outer appearance of the present invention. As shown in FIG. 1, the present invention includes a plurality of unit treatment tanks 10 connected in a stepwise manner, The yarn tribune 91 and the filtration tank 93 can be constructed to control the inflow amount and to filter the final discharge water.

1, the entire configuration is shown as being exposed, but the settling tank 91, the unit treatment tank 10, the filtration tank 93, and the piping connected thereto are installed in a state of being buried in the ground And only the planting portion of the purification plant (vegetation plant) such as the vegetation material 30 at the upper end of the unit treatment tank 10 may be exposed to the upper side of the ground.

2, a lower jet opening 15 is provided in an inner bottom surface of the unit treatment tank 10 constituting the present invention to supply compressed air or backwash water to the unit treatment tank 10, A flow of the treated water occurs, and an inlet 13 into which the treated water flows is formed below the one side wall 11 of the unit treatment tank 10.

2 and 3, a lower jet opening 15 is provided in an inner lower portion of the unit treatment tank 10, and an upper jet opening 16 is provided in an upper portion of the inside of the unit treatment tank 10, The jet directions of the lower jet opening 15 and the upper jet opening 16 are arranged so as to be opposite to each other.

The lower jet opening 15 and the upper jet opening 16 of the present invention are means for forming a forced swirling flow in the unit treatment tank 10 in the backwash process to be described later, Likewise, the lower part engine 17 and the upper part engine 18, which are piped in the same structure to each unit treatment tank 10, are connected to the feed pipe 19, The engine 18 is attached to the inner bottom surface of the unit treatment tank 10 or embedded in the wall surface structure of the unit treatment tank 10 or the like.

On the other hand, on the other side of the inlet port 13 forming wall 11 of the unit treatment tank 10, a flow wall 12 is formed, and the treated water flowing from the lower side of the unit treatment tank 10 An upward flow is formed which is discharged through the flow wall 12.

2, an outlet 71 is formed in the upper portion of each unit treatment tank 10 in the present invention so that the backwash water reversal weight of the unit light weight filter medium 20, which will be described later, The discharge valve 72 is connected to the discharge port 71 of each unit treatment tank 10 so that the discharge port 71 can be opened and closed as shown in FIG. And each discharge valve 72 is connected to a backwash water treatment tank 94 installed at the downstream of the wetland through a discharge pipe 75.

That is, the discharge port 71 of each unit treatment tank 10 that can be opened and closed through the discharge valve 72 is connected to the single discharge pipe 75, whereby the backwash generated in each unit treatment tank 10 is collected, And is collected (collected) by the backwash water treatment tank 94 of the sewage treatment plant.

In the embodiment shown in FIG. 2, the backwash water treatment tank 94 installed in the downstream part of the constructed wetland is formed as a simple sedimentation tank, but a high speed sedimentation tank or a coagulating sedimentation tank may be used. In the backwash water treatment tank 94 The first solid-liquid separated backwash water may be separated into a second solid-liquid separation through a separate mechanical filtration apparatus, a screw decanter or a hydro cyclone.

2 and 4, a conveyance pipe 78 for connecting the backwash water treatment tank 94 to the settling tank 91 in the upstream of the wetted artificial wetland is provided. The conveyance pipe 78 is provided with a return pump 77, And a circulation type backwash structure in which the upper water of the backwash water treatment tank 94, that is, the solid water separated backwash water, is supplied as the treated water of the wetland constructed.

In the present invention, the vegetation structure on the upper part of the unit treatment tank 10 is constructed by the vegetation material 30 loaded on the loading box 50 installed on each unit water tank as shown in FIG. 1, and the vegetation material 30 ) May be applied to general granular vegetation as well as natural fiber regenerated vegetation material (30) such as coir fibrous vegetation material (30).

As shown in FIGS. 2 and 5, the loading box 50 on which the vegetation material 30 is loaded is constituted by a box having a plurality of water holes 51 punctured at regular intervals (equally spaced) In the illustrated embodiment, the side plate of the loading box 50 is attached to the side wall of the unit treatment tank 10 by screws, but a part of the upper end of the loading box 50 is laterally projected, The loading unit 50 and the unit treatment tank 10 can be detachably attached.

5, a plurality of cut-outs 56 are formed in the outer bottom surface of the loading box 50 so that the opening / closing plate 55 formed at the same interval as the water supply holes 51 of the loading box 50 can be reciprocated So that the water supply hole 51 of the loading box 50 can be opened and closed.

That is, in the state in which the cut-off port 56 of the opening / closing plate 55 overlaps the water supply hole 51 of the loading box 50, the water supply hole 51 is opened so that the treated water of the unit treatment tank 10 And the water supply hole 51 and flows into the loading box 50. When the opening and closing plate 55 is horizontally moved and the incision opening 56 is spaced apart from the water supply hole 51, And the inflow of the treated water into the loading box 50 is blocked.

Through the selective opening and closing structure of the water tank 51 of the loading box 50, it is possible to prevent the inflow of the contaminant-containing stationary water 50, which may be generated in the backwash process to be described later, It is possible to prevent contamination.

5, when the open / close board 55 is mounted on the bottom of the loading box 50, the opening / closing board 55 is formed with a long moving groove 58, The support rod 57 having the support portion 57 formed thereon is passed through the movement groove 58 and is fastened to the bottom plate of the loading box 50 so that the head of the support rod 57 supports the opening and closing plate 55, A reciprocating lever 59 protruding upward is provided on one side of the opening / closing plate 55 so as to enable easy operation on the ground, Respectively.

6 is a longitudinal sectional view showing the operation state of the multi-stage structured wetland to which the present invention is applied. As shown in the figure, the coarse-grained solid material flows into the settling tank 91 through the inflow pipe 61, The primary settled treated water enters the unit treatment tank 10 through the inlet 13 at the lower end of the wall 11 of the unit treatment tank 10 and then passes through the lightweight filter medium 20, The treated water that has passed through the lightweight filter medium 20 flows into the loading box 50 and permeates into the vegetation material 30 to be contacted with the planted plant And is discharged through the overflow wall 12 through the overflow.

As shown in FIGS. 2 and 6, the treated water overflowing the flood walls 12 is once stored in the intermediate storage tank 92 formed at the connection site between the unit treatment tanks 10, Is introduced into the unit treatment tank 10 which is provided on the downstream side of the unit treatment tank 10 at the front end and forms a lower elevation surface and is treated in the same manner as the treatment water treatment method in the unit treatment tank 10 The process water treatment by the unit treatment tank 10 is repeated for each unit treatment tank 10 constituting the entire wet wetland, and then, as shown in FIG. 6, The water flows into the filtration tank 93 located in the downstream part of the constructed wetland and the fine granular media loaded in the filtration tank 93 finally filtrates the treated water and discharges it to the outflow pipe 69, Is completed.

7 is a cross-sectional view showing in detail the manner of transferring and purifying the treated water in the unit treatment tank 10. As shown in the figure, the basic flow of the treated water in the unit treatment tank 10 is one side An inflow port 13 formed at the lower end of the wall 11 and an upward flow reaching the upper end of the other side wall 12 constitute a lightweight filter medium 20 And then flows into the loading box 50 and comes into contact with the vegetation material 30 and the purifying plant and then flows over the upper end of the louver 12.

The treated water flows into the loading box 50 on which the vegetation material 30 is loaded and also flows upward so that the treated water passes through the plurality of perforated water holes 51 on the bottom plate of the loading bay 50, An opening and closing plate 55 for opening and closing the water supply hole 51 is closely attached to the bottom surface of the bottom plate of the loading box 50 as described above and the top of the unit treating tank 10 In the operation, that is, when the treatment water is allowed to flow into the loading box 50, the water hole 51 of the loading box 50 is opened and during the backwashing operation of the unit treatment tank 10 as shown in FIG. 8, The flow-through hole 51 of the loading box 50 is closed.

The opening / closing function of the water supply hole 51 of the loading box 50 is the same as that of the enlarging portion in the ellipse of Figs. 5 and 7 and the enlarging portion in the ellipse of Fig. 8, Closing plate 55 as shown in FIG. 7 is formed by equally spacing cut-outs 56 formed at regular intervals in an opening / closing plate 55 which is in close contact with an outer bottom surface of the loading box 50, The treated water in the unit treatment tank 10 passes through the cut-off port 56 and the water supply hole 51 in the stacking direction 50 in a state where the cut-out port 56 of the loading unit 50 and the water supply hole 51 of the loading unit 50 are overlapped, The opening and closing plate 55 is moved as the user operates the reciprocating lever 59 as shown in FIG. 8 and the cutout 56 is spaced apart from the water supply hole 51, The flow of the treated water is blocked.

8, the attachment of the opening / closing plate 55 to the loading box 50 is performed by inserting the supporting rod 57 having the enlarged toe at the lower end thereof into the opening / closing plate 55, The effective length on the plane of the moving groove 58 or the clearance of the moving groove 58 coupled with the supporting rod 57 The water passage hole 51 can be precisely opened and closed in accordance with the horizontal reciprocation of the in-play opening / closing plate 55 of the moving groove 58. [

8, the discharge port 71 formed in the upper portion of the unit treatment tank 10 is opened and the lower jet port 15 and the upper jet port 16, which are respectively provided in the lower and upper parts of the unit treatment tank 10, When the backwash water of compressed air or high pressure is supplied to backwash the lightweight filter medium 20, the watertight hole 51 of the loading box 50 is tightly closed so that the viscous contaminants contained in the backwash water 50 ) Influx can be effectively blocked.

In the backwashing of the lightweight filter medium 20 as shown in FIG. 8, the lightweight filter medium 20 is vibrated or floated so that the solid contaminants deposited in the air gap between the lightweight filter media 20 Of course, the contaminants deposited on the surface of the lightweight filter medium 20 can also be effectively separated. The lightweight filter medium 20 applied to the present invention is not limited to the porous lightweight volcanic stone or artificially produced ceramic and synthetic resin As a comparatively lightweight filter material having a specific gravity close to 1 or 1 or less, compressed air or backwash water is supplied and accompanied with the generation of the treated water flow in the unit treatment tank 10.

The vibration or floating flow of the lightweight filter medium 20 is induced by the flow of the treated water in the unit treatment tank 10. In the present invention, as shown in FIG. 8, by forming a wide swirl flow in the unit treatment tank 10, Thereby maximizing the flow of the treated water and the vibration of the lightweight filter medium 20 accompanying therewith.

The swirl flow in the unit treatment tank 10 of the present invention is achieved through the lower jet opening 15 and the upper jet opening 16 as described above and these lower jet opening 15 and upper jet opening 16 are formed by The lower injection port 15 is connected to the lower partial orifice 17 branched from the pressure feed pipe 19 provided above the unit treatment tank 10 and the upper partial orifice 15 branched from the upper partial orifice And the injection direction of the lower ejection opening 15 and the ejection direction of the upper ejection opening 16 are opposite to each other so that the compressed air or backwash As shown in FIG. 8, the swirling flow is formed by being simultaneously injected through the lower jet opening 15 and the upper jet opening 16.

Although not shown in the accompanying drawings, the pressurizing pipe 19 is connected to a pressurizing means capable of pressurizing compressed air such as a compressor or a pump with high pressure.

1 and 3, a separate valve is provided for each of the lower partial engine 17 and the upper partial engine 18 branched from the pressure feeding pipe 19, and these lower partial engines 17, And the upper part organ 18 can be opened and closed individually so that the lower injection opening 15 can be utilized as an aeration device by intermittently releasing only the lower side orifice 17 on a flat surface instead of the back side.

That is, the upper jet opening 16 and the lower jet opening 15, which are vertically spaced apart from each other, are disposed opposite to each other and jetted compressed air or backwash water through the upper jet opening 16 and the lower jet opening 15 A vigorous swirling flow is formed in the unit treatment tank 10 and vibration and mutual collision of the floating filter medium 20 are caused to thereby effectively remove contaminants deposited in the floating filter medium 20 and maximize backwashing efficiency will be.

On the other hand, in order to create a vibrating or floating flow environment of the lightweight filter medium 20, it is necessary to enlarge the working space much larger than the lightweight filter medium 20 in the seating state.

However, when the active space of the lightweight filter medium 20 is constantly secured and free flow of the lightweight filter medium 20 becomes possible, the gap between the lightweight filter media 20 is enlarged and the substantial filtering function is lost. 20, the space for loading the lightweight filter media 20 is limited to maintain a tightly stacked state. In the backwash operation as shown in FIG. 8, the active space of the lightweight filter media 20 is dramatically expanded In the present invention, the above-described object is achieved by providing a floatation restraining plate 40 which can be raised and lowered by an external operation on the light weight filter medium 20.

That is, as shown in FIGS. 5 and 9, a lattice-shaped or network-shaped plate serving as a screen or a grating passes through the process water to allow the lightweight filter medium 20 to float The lifting plate 40 is provided so as to be able to move up and down so as to pressurize the lightweight filter medium 20 to maintain a tightly stacked state and to release the pressure when backwashing to allow free flow of the lightweight filter medium 20 .

As shown in FIGS. 8 and 9, the floatation-inhibiting plate 40 of the present invention is free to move up and down while sliding along the wall 11 of the unit treatment tank 10, A plurality of support rollers 43 that are freely rotatable on the outer periphery of the floatation restraining plate 40 are provided so that the support rollers 43 can be moved in the unit treatment tank Or along the surface of the wall 11 or the wall 10 of the wall 10.

5 and 9, a rotation lever 45 hingedly connected to the one side wall 11 of the unit treatment tank 10 through the rotation shaft 46 is provided as a lifting operation means of the floatation restraining plate 40 An inclination action groove 42 is formed in an upper portion of one side of the flotation plate 40 and an active roller 47 is attached to the lower end of the rotation lever 45 so that the rotation lever 45 are rotated, the lifting plate 40 is lifted and lowered while the active roller 47 is traveling along the tilting action grooves 42.

9, the inclined action groove 42 formed in the flotation plate 40 is formed with a bracket 41 protruding upward on one side of the upper surface of the flotation plate 40, The tilting action groove 42 is formed in an arcuate shape so that the tilting lever 45 is engaged with the lower action roller 47 ) Can be smoothly performed in a single step.

10: Unit treatment tank
11: Wall
12: Wolli Walls
13: inlet
15: Lower nozzle
16: Upper nozzle
17: Lower part engine
18: Phase section machinery
19: Pneumatic tube
20: Lightweight filter media
30: Vegetation material
40:
41: Bracket
42: incline activity home
43: support roller
45: Tilting lever
46:
47: Activity Rollers
50: Loading
51: water ball
55: opening / closing plate
56: incision opening
57: support rod
58: Moving home
59: Reciprocating lever
61: inlet pipe
69: Outflow tube
71: outlet
72: discharge valve
75: discharge pipe
77: return pump
78: Return pipe
91:
92: Middle storage tank
93: Filtration tank
94: Backwaters water treatment tank

Claims (2)

A plurality of unit treatment tanks 10 in which a plurality of unit treatment tanks 10 in which a filter material 30 is installed and a filter material 30 is installed in the upper portion are connected in a multistage manner, and a lower jet opening 15 is provided in an inner lower portion of the unit treatment tank 10 An upper jet opening 16 is provided in an inner upper portion of the unit treatment tank 10 and an ejecting direction of the lower ejection opening 15 and an ejecting direction of the upper ejection opening 16 are opposite to each other, The swirling flow of the treated water in the unit treatment tank 10 is generated as the compressed air or backwash water is supplied to the upper jet opening 16 and the lower part of the side wall 11 of the unit treatment tank 10 is provided with an inlet 13 and a lightweight filter medium 20 for filtering contaminants in the treatment water is loaded in the unit treatment tank 10 so that the treated water flowing into the inlet 13 is filtered while passing through the lightweight filter medium 20, A vegetation material (plant material) 30 is stacked on the upper part of the unit treatment tank 10 and a plurality The treatment water having passed through the lightweight filter medium 20 is brought into contact with plants planted in the vegetation material 30 and discharged therefrom. And a discharge port 71 connected to the discharge valve 72 is formed in the upper part of the unit treatment tank 10 so that the discharge valve 72 is opened when the light weight filter medium 20 is backwashed, A plurality of incision openings 56 are closely attached to the outer bottom surface of the loading box 50 such that the opening and closing plates 55 formed at the same intervals as the water supply holes 51 can reciprocate, The treated water in the unit treatment tank 10 is sequentially passed through the cut-off port 56 and the water supply hole 51 and flows into the loading box 50 while the opening and closing plate 55 In the upflow type multistage wetland filter in which the inflow of the treated water into the loading box 50 is blocked in a state where the cut-off port 56 is separated from the water supply hole 51,
A floatation restraining plate 40 for passing treatment water through the lightweight filter medium 20 of the unit treatment tank 10 and blocking the floating of the lightweight filter medium 20 is disposed above the wall 11 of the unit treatment tank 10 And is arranged so as to be free to ascend and descend while being prevented from moving to the side;
A rotary lever 45 having an active roller 47 mounted on a lower end thereof is hingedly connected to a side wall 11 of the unit treatment tank 10 through a rotary shaft 46;
A slanting action groove 42 is formed on one side of the floating plate 40 and the active roller 47 is engaged with the slanting action groove 42 so that the active roller 47 Is moved along the inclined action groove (42) to lift and lower the injury suppression plate (40). delete

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