KR102215767B1 - Non-point contaminant reducing device for treatment of first rain water - Google Patents

Abstract

The present invention purifies non-point pollutants such as organic nutrients, heavy metals, oils, and various contaminants included in the initial rainwater, and reduces nonpoint pollutants for initial rainwater treatment that can smoothly drain the rainwater that has flowed in regardless of the amount of rain. Regarding an apparatus, a sedimentation tank 10 in which rainwater introduced from the road surface is collected, and a filtering tank 20 that is discharged to the basement through a plurality of drainage holes 21 formed at the bottom by supplying the rainwater discharged from the sedimentation tank 10 ), a flow distribution cell 30 installed on the inside of the filtration tank 20 and distributed to the vegetation treatment unit and the permeation treatment unit consisting of a plurality of rainwater supplied from the sedimentation tank 10 and drained downward, and the flow rate distribution A first filter treatment unit 40 that is installed to supply the drained rainwater to the lower part of the cell 30 so that the first filtered water filtered through the first filter material 41 is drained downward, A second filter treatment unit 50 installed to supply the first filtrate drained to the lower portion of the first filter treatment unit 40 to be drained downward from the second filtrate water obtained by filtering the first filtrate; and the second filter treatment unit The second filtrate that cannot be drained through the drain hole 21 is overflowed on both sides of 50 and flows into the overflow water inlet 61, and the overflow water introduced through the overflow water inlet 61 is It is characterized in that it is configured to include an overflow treatment water passage 60 formed to be discharged to the overflow water outlet 62 to treat sewage.

Description

Non-point pollutant reduction device for initial rainwater treatment {NON-POINT CONTAMINANT REDUCING DEVICE FOR TREATMENT OF FIRST RAIN WATER}

The present invention purifies non-point pollutants such as organic nutrients, heavy metals, oils, and various contaminants included in the initial rainwater, and reduces nonpoint pollutants for initial rainwater treatment that can smoothly drain the rainwater that has flowed in regardless of the amount of rain. It relates to the device.

In general, pollutants can be classified into point pollutants and nonpoint pollutants.Point pollutants are discharged from places with clear discharge points, such as household sewage, industrial wastewater, and livestock wastewater, and most of these point pollutants are purifiers or wastewater. By installing treatment facilities, pollutants can be efficiently purified.

On the other hand, non-point pollutants are discharged from unclear and wide areas such as agricultural land, grassland, forest land, construction sites, mines, waste landfills, roads and industrial sites, and are difficult to collect and change in emissions, so design and maintain treatment facilities. There is a problem that is difficult to manage.

When non-point pollutants remain on the surface, they are mixed with rainwater flowing through the surface during rainfall.As a result, there are many non-point pollutants in the initial rainfall compared to the rain after a certain period of time after rain.

When these non-point pollutants flow into public waters or groundwater such as rivers, inner bays, and lakes along with the initial rain, they not only pollute the water quality but also become the main cause of destroying the ecosystem.

Accordingly, the importance of non-point source management for preventing water pollution and protecting the ecosystem is increasing, and it is specified in the facility standards to install a purification device for drainage of the road surface when constructing roads or bridges.

Conventionally, as in Korean Registered Patent Publication No. 10-0958326, in order to remove non-point pollutants included in the initial rainwater, an initial rainwater treatment device using infiltration and vegetation consisting of a first reservoir, a vegetation treatment section, a penetration treatment section, and a second reservoir is Was proposed.

However, in the above-described initial rainwater treatment device, nonpoint pollutants were not properly filtered as the initial rainwater flowing into the first reservoir flows out through a plurality of holes provided in the gravel layer and bottom provided in the first reservoir before it is moved to the vegetation treatment section. There was a problem that could not be done.

In addition, as the vegetation treatment unit is also designed to filter the rainwater moving from the first reservoir through the first outlet passage, the amount of filtration on the side where rainwater flows through the first outlet passage and the side where rainwater is discharged to the second reservoir This causes the drainage efficiency to be lowered so that the rainwater flowing into the vegetation treatment unit cannot be uniformly discharged. This is, in the end, the treatment efficiency of non-point pollutants contained in the initial rainwater when a large amount of rainwater is introduced at once. It led to a deteriorating problem.

Accordingly, the applicant, as in Korean Patent Laid-Open Publication No. 10-2016-0148950, in order to efficiently filter the non-point pollutants contained in the initial rainwater even when a large amount of rainwater is supplied at one time, as well as to smoothly drain rainwater. , Rainwater flowing into the water collecting unit is divided into a plurality of vegetation treatment units and penetration treatment units and filtered. When the rainwater from which non-point pollutants have been filtered is filtered again through the rainwater treatment unit and is drained downward, the rainwater flowing into the stormwater storage unit is An initial rainwater treatment device that stays for a sufficient time and can be discharged to the bottom of the rainwater treatment block has been proposed.

However, the rainwater flowing into the stormwater storage unit is that non-point pollutants have been removed, but since it is introduced in a state containing fine foreign substances, sediments are deposited on the bottom surface of the stormwater storage unit during a certain period of time.

Therefore, the applicant of the present invention was configured to aerate the sediment deposited in the storm water storage and then inhale and discharge the suspended sediment, but it was difficult to float even the sediment that had already been deposited and solidified, thereby removing the solidified sediment. As the dismantling and re-installation work must be performed frequently, there is a problem that the cost required for maintenance is inevitably increased.

Korean Registered Patent Publication No. 10-0958326 (Registration on May 10, 2010, initial excellent water treatment device using infiltration and vegetation) Korean Patent Application Publication No. 10-2016-0148950 (published on December 27, 2016, initial excellent treatment device)

Therefore, the present invention is to solve such a conventional problem, by distributing rainwater introduced from the road surface and filtering and treating non-point pollutants contained in the initial rainwater step by step, and forming each component into a unit structure The purpose of this is to provide a device for reducing non-point pollutants for initial excellent water treatment, which can increase the convenience of management and maintenance as well as increase the convenience of the product.

In addition, even if a large amount of rainwater flows in, it can be drained quickly and smoothly, as well as a non-point pollutant reduction device for initial rainwater treatment that can easily and conveniently remove foreign substances generated in the process of treating initial rainwater. There is a purpose to provide.

The present invention is to achieve the above object, is formed to collect rainwater introduced from the road surface, and one side is formed to discharge the rainwater collected in excess of the set height through the rainwater transfer pipe (15) a settling tank (10); It is installed to receive the rainwater discharged from the rainwater transfer pipe 15 on one side of the sedimentation tank 10, and a plurality of drainage holes 21 are formed on the lower surface of the rainwater so that non-point pollutants contained in the rainwater are filtered and discharged to the basement. Filtration tank 20; A plurality of vegetation treatment units 31 made of a vegetation layer and a plurality of penetration treatment units 32 made of a filter medium are provided on the inside of the filtration tank 20, and a plurality of rainwater discharged from the rainwater transfer pipe 15 is provided. A flow distribution cell 30 formed to be supplied to the vegetation treatment unit 31 and the infiltration treatment unit 32 to be drained downward; A first filter installed to receive rainwater discharged downward through the vegetation treatment unit 31 and the infiltration treatment unit 32 under the flow rate distribution cell 30, and formed to filter non-point pollutants contained in the rainwater A first filter unit 40 filled with 41 and formed to drain the first filtered water filtered by the first filter material 41 to be drained downward; The second filter material 51 is installed to receive the first filtrate under the first filter unit 40 and formed to filter the first filtrate, and is filtered by the second filter material 51. A second filtration treatment unit 50 formed to be drained downwardly and discharged through the drain hole 21; Overflow water inlets 61 are formed on both sides of the second filter treatment unit 50 and into which the second filtered water that has not been drained through the drain hole 21 overflows and flows into, and through the overflow water inlet 61 It characterized in that it comprises a; overflow treatment water passage (60) provided with an overflow water outlet (61) for discharging the overflow water to one side of the filtration tank (20) so that the introduced overflow water is treated for sewage.

Here, at one side of the sedimentation tank 10, a washing water suction pipe 75 formed to discharge rainwater collected in the sedimentation tank 10 is installed, and between the sedimentation tank 10 and the filtration tank 20, the settling tank 10 collects water. The rainwater supply pump 70 formed to be forced into the suction part 71 through the washing water suction pipe 75 and discharged through the discharge part 72 is installed, and the discharge part 72 It is preferable that the rainwater forcibly discharged through the supply pump 70 is supplied to the overflow treatment water channel 60 and a washing water injection pipe 76 formed to wash the inside with the overflow treatment water 60 is installed.

In addition, the flow distribution cell 30, the first filtration treatment unit 40, the second filtration treatment unit 50, and the overflow treatment channel 60 can be installed and separated in the filtration tank 20 as a unit of one bundle, respectively. It is preferably made of a unit that is present.

As described above, in the apparatus for reducing non-point pollutants for initial rainwater treatment according to the present invention, the rainwater flowing into the road surface is distributed and filtered by a flow distribution cell consisting of a plurality of vegetation treatment units and permeation treatment units, and filtering through the flow distribution cells. The rainwater that has penetrated downward is filtered step by step by the filter media provided in each of the first and second filters and discharged to the basement. When a large amount of rainwater flows in at a time, it is In the filtered state, rapid and smooth drainage is possible through the overflow treatment waterway, so non-point pollutants contained in the initial rainwater can be filtered and safely treated, and stable water permeability can be secured without being affected by rainfall characteristics. There is an effect.

In addition, the flow distribution cell, the first filter treatment unit, the second filter treatment unit, and the overflow treatment channel installed in the filtration tank consist of one unit and are installed to be sequentially received, so that the convenience of construction as well as the convenience of management and maintenance. It has the effect of increasing the installation space and minimizing the installation space of the facility.

In addition, by using the rainwater filled in the sedimentation tank to clean the interior of the overflow treated water, there is an effect of facilitating management of the overflow treated water.

1 is a perspective view showing an apparatus for reducing non-point pollutants for initial excellent water treatment according to an embodiment of the present invention,
Figure 2 is an exploded perspective view of Figure 1,
3 is a cross-sectional view showing an apparatus for reducing non-point pollutants for initial excellent water treatment according to an embodiment of the present invention;
4 is a state diagram showing that the filtered water of the second filtration treatment unit according to an embodiment of the present invention overflows and flows into the overflow treatment channel;
5 is a state diagram showing a process of washing the overflow treatment waterway through the rainwater supply pump according to an embodiment of the present invention.

Hereinafter, an apparatus for reducing non-point pollutants for initial excellent water treatment according to an embodiment of the present invention will be described in detail with reference to FIGS. 1 to 5.

The apparatus for reducing non-point pollutants for initial rainwater treatment according to an embodiment of the present invention is largely a settling tank 10, a filtration tank 20, a flow distribution cell 30, and a first filtration treatment unit as shown in FIGS. (40), characterized in that it is configured to include a second filtration treatment unit (50), and an overflow treatment channel (60).

The sedimentation tank 10 is formed to collect rainwater introduced from the road surface during rainfall, and is formed so that rainwater flows through at least one of one sidewall and upper surface, and when rainwater flows through the upper surface, It is preferable that a grating member 11 for preventing bulky foreign substances from flowing together is installed to be disassembled and coupled.

On one side of the sedimentation tank 10, when the water collection amount reaches a set height, a rainwater transfer pipe 15 is installed so that rainwater collected in excess of the set height is discharged to the outside of the sedimentation tank 10.

The filtration tank 20 is installed to receive the rainwater discharged from the rainwater transfer pipe 15 on one side of the sedimentation tank 10, and the non-point pollutants contained in the rainwater are filtered and treated underground. A plurality of drainage holes 21 are formed to be discharged.

The flow distribution cell 30 is installed on the upper side of the filter tank 20 to receive the rainwater discharged from the rainwater transfer pipe 15 and drain it downward.

The flow distribution cell 30 includes a vegetation treatment unit 31 constituting a vegetation layer containing gravel, soil, plants, etc., and a penetration treatment unit 32 constituting a filter material layer including landscaping stone, gravel, charcoal, metal mesh, etc. Each is equipped with a plurality.

At this time, the vegetation treatment unit 31 and the infiltration treatment unit 32 are arranged to divide the space in which the vegetation layer and the filter media layer are accommodated by a partition wall 33 installed to divide the interior into a plurality of spaces, as shown in the accompanying drawings. Unlike this, a plurality of receptors (not shown) with an open top and an accommodation space are provided, so that the receptors containing the vegetation layer are used as the vegetation treatment unit 31, and the receptors containing the filter media layer are the penetration treatment units 32 It can also be used as.

Here, the vegetation treatment unit 31 is to allow the rainwater supplied through the rainwater transfer pipe 15 to pass through the vegetation layer and filter non-point pollutants contained in the rainwater, and the penetration treatment unit 32 is the rainwater transfer pipe 15 due to an increase in rainfall. ), when the rainwater supplied through the vegetation treatment unit 31 is not treated and overflows, the rainwater that has overflowed from the vegetation treatment unit 31 is supplied and dispersed and drained.

A plurality of communication holes 34 through which the vegetation treatment part 31 and the penetration treatment part 32 are communicated with each other are formed in the partition wall 33 or the receptor, so that excellent drainage efficiency flowing into the vegetation treatment part 31 While increasing, it is preferable that rainwater flowing into the permeation treatment unit 32 flows into the adjacent vegetation treatment unit 31 so that non-point pollutants can be filtered.

The first filtration treatment unit 40 is installed under the flow distribution cell 30 to receive rainwater discharged downward through the vegetation treatment unit 31 and the penetration treatment unit 32, and non-point pollutants included in the rainwater. The first filter material 41 formed to filter the is filled, and the first filter water filtered by the first filter material 41 is formed to be drained downward.

The second filtration treatment unit 50 is installed to receive the first filtrate under the first filtration treatment unit 40 while the lower surface is supported by being placed on the bottom surface of the filtration tank 20, and filters the first filtrate. The second filter medium 51 formed to be filtered is filled, and the second filtered water filtered by the second filter material 51 is drained downward and is discharged through the drain hole 21 under the filter tank 20. .

At this time, the size of the second filter material 51 is preferably formed to be larger than the first filter material 41, which is the rainwater that has already flowed into the upper side of the filter tank 20, the vegetation treatment unit 31 and the first filter treatment unit 40 ), since the non-point pollutants contained in the rainwater are sufficiently removed while passing through), the non-point pollutants that have not yet been removed are removed while passing through the second filter material 51, and at the same time, the efficiency of drainage is increased.

The overflow treatment water passage 60 is installed on both sides of the second filter treatment unit 50, and overflow water inlets 61 through which the second filtered water that has not been drained through the drain hole 21 overflows and flows into, are formed, A overflow water outlet 62 for discharging the overflow water introduced through the overflow water inlet 61 to one side of the filtering tank 20 to be treated for sewage is provided.

Here, the overflow treatment water channel 60 is formed to have a length corresponding to the side wall portion corresponding to the longitudinal direction of the filtration tank 20, and the overflow water inlet 61 is formed along the longitudinal direction in which the overflow treatment water channel 60 is installed. It is preferable that the second treated water which cannot be drained from the second filter treatment part 50 and is filled without being drained from the second filter treatment part 50 is smoothly overflowed and introduced therein by forming it on the upper side of the side wall part facing the second filter treatment part 50.

In order to allow the second treated water overflowed to the overflow water inlet 61 to be quickly drained through the overflow water discharge port 62, the overflow treatment water channel 60 is positioned at the bottom of the overflow water discharge port 62. It is preferable to install it in an inclined manner, or to form the bottom surface of the overflow treatment waterway 60 to be inclined toward the overflow water outlet 62.

At this time, the overflow treatment water channel 60 is installed to be in contact with the bottom surface of the central portion of the filtration tank 20, or the inner wall surface of the filtration tank 20 with the second filter material 51 filled in the second filtration treatment unit 50 interposed therebetween. It can be installed to be supported while in contact with the and the bottom surface.

The overflow water inlet 61 may be formed at a height set on the side wall as shown in the accompanying drawings, but unlike this, the second filtered water that cannot be drained through the drain hole 21 on the upper surface of the overflow treatment waterway 60 It can be formed so that it can overflow and flow in.

In addition, as the overflow water discharged through the overflow water discharge port 62 is not discharged underground but is discharged to a sewage pipe, the end of the overflow water discharge port 62 is installed to be connected to a sewage pipe (not shown), and the overflow water discharge port ( 62), it is desirable to allow sewage treatment to be treated immediately.

Looking at the effect of the non-point pollutant reduction device for the initial excellent treatment consisting of the above configuration is as follows.

When rainfall begins, rainwater flowing from the road surface moves along the waterway installed at the side of the road or bridge, and is collected in the sedimentation tank 10.

When the amount of rainwater collected in the sedimentation tank (10) increases and is filled to the height of the rainwater transfer pipe (15), the rainwater collected beyond the height of the rainwater transfer pipe (15) is moved to the filtering tank (20). Is discharged to the upper side of.

Rainwater discharged to the upper side of the filtration tank 20 is supplied to the vegetation treatment unit 31 provided in the flow distribution cell 30, and the rainwater supplied to the vegetation treatment unit 31 is filtered through the vegetation layer and drained downward. .

At this time, rainwater introduced in excess of the amount that can be treated by the vegetation treatment unit 31 is supplied to the permeation treatment unit 32 by overflowing the vegetation treatment unit 31, and the rainwater supplied to the penetration treatment unit 32 passes through the filter media layer. It is evenly distributed and drained downwards.

The rainwater discharged from the flow distribution cell 30 only through the vegetation treatment unit 31 or both from the vegetation treatment unit 31 and the infiltration treatment unit 32 is a first filter treatment unit 40 located under the flow distribution cell 30. ).

Rainwater supplied to the first filter treatment unit 40 is removed from non-point pollutants while passing through the first filter material 41, is dispersed and drained while passing through the first filter material 41, The first filtered water that has been filtered and drained by the filter is supplied to the second filtering unit 50 located below the first filtering unit 40.

Rainwater supplied to the second filter material 50 is removed from non-point pollutants while passing through the second filter material 51, is dispersed and drained while passing through the second filter material 51, and is discharged to the second filter material 51. The second filtrate water filtered and drained by the filter tank 20 is discharged to the basement through a drain hole 21 formed in the lower surface of the filter tank 20.

When the initial excellent water containing non-point pollutants is supplied as described above, the vegetation treatment unit 31, the first filter material 41, and the second filter material 51 provided in the filter tank 20 are sequentially passed through, and are filtered and processed in stages, Non-point pollutants contained in the initial rainwater can be safely treated and discharged.

At this time, when the amount of the first filtered water supplied from the first filtering unit 40 is larger than the amount of the second filtered water discharged from the second filtering unit 50 through the drain hole 21, the filter tank 20 The second filtered water, which has risen from the bottom surface, is filled in the second filtering unit 50 located below the filtering tank 20.

In this case, as shown in FIG. 4, the second filtration water cannot be drained through the drainage hole 21 from the second filtration treatment unit 50, and the second filtration water filled in the second filtration treatment unit 50 is filled to a height reaching the overflow inlet 61. The second filtrate filled with a height exceeding the overflow water inlet 61 in the second filtration treatment unit 50 overflows and flows into the overflow treatment waterway 60 through the overflow water inlet 61.

Through this, when a large amount of rainwater flows in at a time, the second treated water filtered by the second secondary filtration treatment unit 20 is quickly and smoothly drained through the overflow treatment waterway 60, so that it is not affected by rainfall characteristics. There is an advantage of securing a stable water permeability without.

In addition, since the overflow treatment water channel 60 is installed in the filtration tank 20, there is no need to provide a separate installation space to treat rainwater that has flowed in a large amount, and the volume of the filtration tank 20 is increased. Since there is no need to do so, there is an advantage of remarkably shortening the working time required for facility construction.

After that, the overflow water flowing into the overflow treatment waterway 60 is discharged through the overflow water outlet 62 to be treated for sewage, which prevents the overflow water discharged through the overflow water discharge port 62 from being discharged to the basement. This is to prevent the ground from being weakened by infiltrating within a short time.

Here, the flow distribution cell 30, the first filtration treatment unit 40, the second filtration treatment unit 50, and the overflow treatment water channel 60 are each composed of one bundle unit, and the filtration tank 20 It may be made of a unit that can be installed and separated within.

At this time, among the components consisting of a unit, the vegetation treatment unit 31 and the infiltration treatment unit 32 provided in the flow distribution cell 30, the first filter material 41 and the second filter treatment unit to be filled in the first filter treatment unit 40 ( The second filter material 51 filled in 50) is accommodated in a frame body or a net-shaped mesh body having a plurality of through-holes for drainage, preventing the drainage efficiency from deteriorating, but easily installed and separated using each unit consisting of a bundle unit. It is desirable to be able to do it.

In this way, in the case where each of the components installed to form a plurality of filtration layers to filter the non-point pollutants contained in the initial rainwater is composed of a unit, it can be quickly installed in the filtration tank 20, as well as filtration after a long period of use. When the efficiency decreases, each component composed of a unit can be easily removed from the filter tank 20, separated, and replaced with a new component for installation.

Accordingly, there is an advantage of remarkably increasing the convenience of work by enabling rapid construction at the construction site, and of remarkably increasing the convenience of management and maintenance by easy separation and replacement construction.

On the other hand, in the process of draining the overflow water in the overflow treatment waterway 60, foreign substances contained in the overflow water are precipitated and deposited, so that the drainage treatment of the overflow water may not be smoothly performed.

In order to solve this problem, the device for reducing non-point pollutants for initial rainwater treatment according to an embodiment of the present invention supplies rainwater collected in the sedimentation tank 10 to the overflow treatment waterway 60 so that it can be used for washing. In order to do so, it may be configured to further include a configuration of the rainwater supply pump 70, the washing water intake pipe 75 and the washing water discharge pipe 76.

The rainwater supply pump 70 is formed to be forcibly sucked through the suction unit 71 and discharged to the discharge unit 72, and the washing water suction pipe 75 supplies the rainwater collected in the sedimentation tank 10 The settling tank 10 and the suction part 71 are connected to each other so that they can be supplied to the suction part 71 by the pump 70, and the washing water discharge pipe 76 is forcibly sucked and discharged from the rainwater supply pump 70. The discharge unit 72 and the overflow treatment water channel 60 are installed to be connected so that the rainwater discharged to the unit 72 can be supplied to the overflow treatment water channel 60.

Through this, when a large amount of rainwater flows in as shown in FIG. 5 and the stormwater supply pump 70 is operated after treating the overflow water flowing into the overflow treatment waterway 60, the rainwater collected in the sedimentation tank 10 is washed water suction pipe. (75) → Suction unit (71) → Discharge unit (72) → It is forcibly supplied into the overflow treatment waterway 60 through the washing water discharge pipe 76, and rainwater forcibly supplied into the overflow treatment waterway 60 It can be used to clean the inside of the overflow treatment waterway (60).

In this washing process, the foreign matter deposited on the bottom surface of the overflow treatment waterway 60 is discharged through the overflow water outlet 62 together with the rainwater supplied through the stormwater supply pump 70 to treat sewage.

In this way, by using the rainwater filled in the sedimentation tank 10 to clean the inside of the overflow treatment waterway 60, it is possible to eliminate the hassle of having to separately provide washing water for cleaning the overflow treatment waterway 60. While still, it is possible to maintain a stable drainage treatment state at all times, and it is possible to increase the maintenance cycle of the overflow treatment waterway 60, thereby increasing the convenience of management and maintenance.

10: settling tank 11: grating member
15: Excellent transfer hall
20: filtration tank 21: drain hole
30: flow distribution cell 31: vegetation treatment unit
32: penetration treatment unit 33: partition wall
34: communication hall
40: first filter processing unit 41: first filter material
50: second filter processing unit 51: second filter material
60: Overflow treatment waterway 61: Overflow water inlet
62: overflow water outlet
70: hydraulic supply pump 71: suction unit
72: discharge unit 75: washing water suction pipe
76: washing water discharge pipe

Claims (3)

A sedimentation tank 10 formed to collect rainwater introduced from the road surface, and to discharge rainwater collected in excess of a set height at one side through the rainwater transfer pipe 15;
It is installed to receive the rainwater discharged from the rainwater transfer pipe 15 on one side of the sedimentation tank 10, and a plurality of drainage holes 21 are formed on the lower surface of the rainwater so that non-point pollutants contained in the rainwater are filtered and discharged to the basement. Filtration tank 20;
A plurality of vegetation treatment units 31 made of a vegetation layer and a plurality of penetration treatment units 32 made of a filter medium are provided on the inside of the filtration tank 20, and a plurality of rainwater discharged from the rainwater transfer pipe 15 is provided. A flow rate distribution cell 30 formed to be supplied to the vegetation treatment unit 31 and the infiltration treatment unit 32 to be drained downward;
A first filter installed to receive rainwater discharged downward through the vegetation treatment unit 31 and the infiltration treatment unit 32 under the flow rate distribution cell 30, and formed to filter non-point pollutants contained in the rainwater A first filter processing unit 40 filled with 41 and formed to drain the first filtered water filtered by the first filter material 41 to be drained downward;
The second filter material 51 is installed to receive the first filtrate under the first filter unit 40 and formed to filter the first filtrate, and is filtered by the second filter material 51. A second filtration treatment unit 50 formed to be drained downwardly and discharged through the drain hole 21;
Overflow water inlets 61 are formed on both sides of the second filter treatment unit 50 and into which the second filtered water that has not been drained through the drain hole 21 overflows and flows into, and through the overflow water inlet 61 Includes; an overflow treatment waterway 60 provided with an overflow water outlet 61 for discharging overflow water to one side of the filtration tank 20 so that the introduced overflow water is treated as sewage,
One side of the sedimentation tank 10 is provided with a washing water suction pipe 75 formed to discharge rainwater collected in the sedimentation tank 10,
Between the sedimentation tank 10 and the filtration tank 20, rainwater collected in the sedimentation tank 10 is forcibly sucked into the suction part 71 through the washing water suction pipe 75 and discharged through the discharge part 72. The rainwater supply pump 70 is installed,
A washing water injection pipe formed in the discharge unit 72 so that the rainwater forcibly discharged through the rainwater supply pump 70 is supplied to the overflow treatment waterway 60 to wash the inside with the overflow treatment water 60 (76) Non-point pollutant reduction device for initial rainwater treatment, characterized in that installed.
delete The method of claim 1,
The flow distribution cell 30, the first filtration treatment unit 40, the second filtration treatment unit 50, and the overflow treatment channel 60 can be installed and separated in the filtration tank 20 as a unit of a bundle, respectively. Non-point pollutant reduction device for initial excellent water treatment, characterized in that consisting of a unit.

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