KR102589869B1 - Apparatus and method for filtering stagnant water using compressed air - Google Patents

Abstract

The present invention relates to an apparatus and method for filtering and treating stagnant water using compressed air. More specifically, the present invention relates to an apparatus and method for filtration and treatment of stagnant water using compressed air, which has a treatment space inside and is provided with an inflow pipe and an outlet pipe communicating with the treatment space on one side and the other, respectively, A filtration tank in which a filter media layer is installed in the path through which rainwater moves from the inflow pipe to the outflow pipe; and a stagnant water discharge unit installed in the treatment space of the filtration tank and filtering and discharging stagnant water remaining after filtration and discharge of rainwater by the filtration tank to the outside.

Description

Apparatus and method for filtering stagnant water using compressed air}

The present invention is a rainwater treatment facility that filters and drains non-point pollutants from initial rainwater during rainfall. More specifically, it provides a separate discharge space with a filter cloth installed at the bottom of the filter tank, and injects compressed air into the filter tank at the end of rainfall. It relates to a filtration treatment device and method that can filter stagnant water remaining in a filtration tank using a pressure filtration method and discharge it naturally.

In general, when rainwater or sewage is filtered, especially in the case of upstream filtration, residual water is bound to remain at a lower level than the outflow pipe after filtration. The residual water becomes a breeding ground for pests such as mosquitoes or decays, creating a foul smell. Because it causes secondary pollution, it must be discharged out of the device after filtration is completed.

In particular, non-point pollution source treatment facilities are required to discharge residual water (stagnant water) within 48 hours after the end of rainfall according to the guidelines of the Ministry of Environment. Therefore, it must be connected to a sewage pipe and sent to a sewage treatment plant for treatment, or if there is no sewage pipe for treatment, a dredging vehicle must be used. It must be collected, processed and disposed of.

However, in the case of collection treatment, it is very unrealistic in terms of cost to collect each rainfall within 48 hours after the end of the rain, and even in the case of linked treatment, if the distance to the sewage pipe is long, the extension of the transfer pipe is long, which creates a cost and social burden. There is a problem that is causing a situation to grow.

In addition, if the capacity of the filtration treatment facility is large and the amount of residual water is large, it may impose a quantitative and qualitative shock load on the sewage treatment plant, so a method of carefully linking treatment should be considered when treating residual water.

Republic of Korea Patent Registration No. 10-0894022

Therefore, the purpose of the present invention is to naturally drain the stagnant water remaining in the filtration tank at the end of rainfall after filtration, thereby eliminating the need for linked treatment with a sewage treatment plant or collection using dredging vehicles after each rainfall. To provide a water filtration treatment device and method.

As a means to solve the above-described problem, the stagnant water filtration and treatment device using compressed air of the present invention (hereinafter referred to as “the device of the present invention”) has an internal processing space and is in communication with the processing space on one side and the other, respectively. A filtration tank equipped with an inflow pipe and an outflow pipe, and a filter media layer installed in the path through which the inflowed rainwater moves from the inflow pipe to the outflow pipe; and a stagnant water discharge unit installed in the treatment space of the filtration tank and filtering and discharging stagnant water remaining after filtration and discharge of rainwater by the filtration tank to the outside.

As an example, the filtration tank includes a first valve and a second valve that are respectively mounted on the inlet pipe and the outlet pipe and open and close, and the stagnant water discharge unit includes an air supply unit that generates and discharges compressed air, and A first supply pipe mounted to supply compressed air discharged from the air supply unit to the processing space, a discharge space provided at a lower position than the floor of the processing space and having an opening formed at the top to communicate with the processing space, and A filter sheet mounted to cover the opening of the discharge space, a discharge pipe that communicates with the discharge space and passes through the filter sheet to discharge stagnant water flowing into the discharge space to the outside, and operation of the first valve and the second valve. It is characterized by including a control unit that controls the operation of the air supply unit to close the inlet pipe and the outlet pipe so that compressed air is supplied to the processing space through the first supply pipe.

As an example, the filter sheet is characterized by being made of an elastic material.

As one example, the filter sheet is characterized by having a relatively larger area than the area of the opening.

As an example, the stagnant water discharge unit includes a third valve that is mounted on the discharge pipe and operates to open and close, one end of which is connected to branch from the discharge pipe, and the other end of which is connected to the air supply section, so that the compressed air discharged from the air supply section is It further includes a second supply pipe to be supplied to the discharge space, and the control unit controls the operation of the third valve to close the discharge pipe and controls the operation of the air supply unit to supply compressed air to the second supply pipe for a preset time. Its characteristic feature is that it is supplied to the discharge space through a supply pipe.

As an example, the filter sheet is characterized in that a portion of the stagnant water remaining in the discharge pipe flows into and fills the discharge space as the compressed air is supplied, thereby maintaining the state in which an upward valley is formed.

Meanwhile, in the stagnant water filtration treatment method using compressed air of the present invention (hereinafter referred to as the "method of the present invention"), the initial rainwater due to rainfall flows into the filtration tank through the inlet pipe, and after filtration in the filtration tank, the outflow pipe Discharging through (S100); and a step (S200) of filtering and discharging stagnant water remaining in the treatment space of the filtration tank to the outside using the device of the present invention described above after the inflow of rain has ended.

As an example, before step S200, the discharge pipe through which stagnant water is discharged is closed from communicating with the outside, and compressed air is injected into the discharge space of the stagnant water discharge unit through a second supply pipe branching from the discharge pipe for filtration. It is characterized by further comprising the step of backwashing the sheet and inducing dispersion of the sediment in the filter tank.

As an example, after step S200, the discharge pipe through which stagnant water is discharged is closed from communicating with the outside, and immediately after injecting compressed air into the discharge space of the stagnant water discharge unit through the second supply pipe branching from the discharge pipe. It is characterized by further comprising the step of closing the second supply pipe so that a portion of the stagnant water remaining in the discharge pipe flows into and fills the discharge space, thereby maintaining the filter sheet in an upwardly ridged state.

In this way, according to the present invention, a separate discharge space with a filter cloth installed at the bottom of the filtration tank is provided, and compressed air is injected into the filtration tank at the end of rainfall, and the stagnant water remaining in the filtration tank is naturally drained after filtration through a pressurized filtration method, thereby reducing the stagnant water. It is economically effective in treating stagnant water because there is no need for linked treatment with a sewage treatment plant or collection using dredging vehicles after every rainfall.

In particular, in the case of the filter cloth installed in the discharge space, it is made of an elastic material and is installed with an area larger than the opening of the discharge space, so it is inflated by the compressed air injected during the backwashing process and maintains an upwardly convex dome shape, thereby preventing the filtration process by the filter cloth. There is an effect of preventing the filtration efficiency of the filter cloth from being impaired by sediment by allowing the particles previously settled on the upper part of the filter cloth to float or be pushed out in the side direction.

In addition, when applying the pressure filtration method, pressure is applied to the filtration tank, and while the discharge process for stagnant water is performed, the filter cloth is bent in the direction of the discharge space and maintains a concave shape, forming a large surface area of the filter cloth, thereby increasing the filtration load (linear velocity). This has the effect of improving the filtration efficiency of stagnant water.

1 is a side cross-sectional view showing the configuration of a device according to an embodiment of the present invention.
Figure 2 is a side cross-sectional view showing the filtration process of a filter sheet according to an embodiment of the present invention.
Figure 3 is a side cross-sectional view showing the backwashing process of a filter sheet according to an embodiment of the present invention.
Figure 4 is a flowchart showing the method of the present invention.
5A to 5F are operating state diagrams for explaining the present invention.

In describing the present invention, the terms and words used in the specification and claims are based on the principle that the inventor can appropriately define the concept of the term in order to explain the invention in the best way. It must be interpreted with meaning and concepts consistent with the technical ideas of.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

The device of the present invention includes a filtration tank (10) for filtering and discharging the initial rainwater that flows in during rainfall, and a stagnant water discharger provided in the filtration tank (10) to discharge stagnant water remaining in the filtration tank (10) to the outside. It may be configured to include a unit 20.

The filtration tank 10 has a treatment space 100 inside and is provided with an inflow pipe 110 and an outlet pipe 120 in communication with the treatment space 100 on one side and the other, respectively, and the inflow pipe ( A filter layer 140 may be installed on the path moving from 110) to the outlet pipe 120.

The filtration tank 10 may be a non-point pollution facility in which initial rainwater selectively collected during rainfall flows into the interior. Although not shown in the drawing, the inlet pipe 110 is connected to the stormwater main pipe and is connected to the rainwater treatment space (100). ) can flow into the

As an example, the filtration tank 10 may be a general upflow filtration device.

Referring to FIG. 1, the filtration tank 10 of this embodiment has a first space 101 in which the processing space 100 communicates with the inlet pipe 110 by a partition 130 installed vertically in the processing space 100. and the outflow pipe 120 may be partitioned and separated into a second space 102 in communication.

The lower part of the partition wall 130 is open so that the first space 101 and the second space 102 can communicate with each other. In addition, the partition wall 130 is opened at an upper position higher than the installation position of the inflow pipe 110, so that when the initial inflow of rainwater exceeds the height of the partition wall 130, the inflow rainwater overflows into the second space 102. Allows drainage through the outlet pipe 120 without filtration.

If the filtration tank 10 is an upflow filtration device, the filter media layer 140 may be installed in the second space 102.

The filter media layer 140 is installed at a lower position than the outflow pipe 30 in the second space 102, so that initial rainwater, etc. delivered from the first space 101 flows in through the opening on the lower side of the partition wall 130. In the process of initial rainwater passing through the filter layer 140, non-point pollutants included in the initial rainwater can be filtered, and the treated water filtered in this way can be drained through the outflow pipe 120. .

Although the filter layer 140 is not shown in the drawing, its position on the second space 102 may be fixed by a mesh frame structure having a mesh structure, etc., and may be formed by a cluster of a plurality of filter materials. .

At this time, the material of the filter medium is not limited, and any material that has the function of filtering non-point pollutants may be used. As an example, the filter medium may be expanded polypropylene.

The inflow pipe 110 and the outflow pipe 120 of the filtration tank 10 are equipped with a first valve 111 and a second valve 121, respectively, so that the pipes are opened and closed to selectively allow the inflow of rainwater and the outflow of treated water. You can. The opening and closing operations of the first valve 111 and the second valve 121 may be controlled by the control unit 250, which will be described below.

The first valve 111 and the second valve 121 can be opened only for a certain period of time to filter initial rainwater containing a relatively large amount of non-point pollutants during rainfall, and can be used to filter stagnant water or stagnant water in the treatment space 100. When discharging backwash water used in the backwashing process of the filter media layer 140, at least one selected from the inlet pipe 110 or the outlet pipe 120 may be operated to open.

The stagnant water discharge unit 20 is installed in the treatment space 100 of the filtration tank 10, and after filtration and discharge of the initial rainwater by the filtration tank 10, the stagnant water remaining unfiltered is filtered and treated externally. It can be discharged as .

The stagnant water discharge unit 20 according to an embodiment of the present invention may apply a pressure filtration method in which stagnant water is pushed out using compressed air.

As shown in FIG. 1, the stagnant water discharge unit 20 may be configured to include an air supply unit 200, a first supply pipe 210, a discharge space 220, a filter sheet 230, and a discharge pipe 240. there is.

The air supply unit 200 can generate and store compressed air and selectively discharge the stored compressed air. As an example, the supply unit 200 may include a compressor that produces compressed air, an air tank that stores the compressed air produced by the compressor and is operated by an external control signal to selectively supply the stored compressed air. .

The first supply pipe 210 may be installed to supply compressed air discharged from the air supply unit 200 to the processing space 100 of the filtration tank 10. That is, one end of the first supply pipe 210 may penetrate the outer wall of the filtration tank 10 and be located in the treatment space 100, and the other end may be connected to the air tank of the air supply unit 200.

The discharge space 220 is provided at a position lower than the floor of the processing space 100, and an opening 221 is formed at the top to communicate with the processing space 100.

The filter sheet 230 may be mounted to cover the opening 221 of the discharge space 220.

Therefore, the stagnant water remaining in the treatment space 100 may pass through the filter sheet 230 installed in the opening 221 and flow into the discharge space 220, and in this process, filtration of the stagnant water may be performed. there is.

Here, it is preferable to select the filter sheet 230 with dense fiber spacing to have higher filtration efficiency than the filter medium used in the filtration process of the filtration tank 10. In the case of this filter sheet 230, the filtration speed is low and the filtration loss is large. This is possible because it applies a pressure filtration method that pushes stagnant water with compressed air rather than a natural drainage method of stagnant water.

The discharge pipe 240 communicates with the discharge space 220 and moves the stagnant water flowing into the discharge space 220 through the filter sheet 230 through pressurization using compressed air to be discharged to the outside.

For example, one end of the discharge pipe 240 may be installed in communication with the discharge space 220, and the other end may be connected to a sewer pipe, etc.

In addition, the discharge pipe 240 is equipped with a third valve 241 that selectively opens and closes, so that the pipe can be opened only when stagnant water is discharged.

The control unit 250 can set the discharge time of stagnant water and control the operation of each component required for the discharge of stagnant water.

The control unit 250 controls the operation of the first valve 111 and the second valve 121 to maintain a constant pressure by compressed air in the filtration tank 10 when discharging stagnant water, so that the inlet pipe 110 and the outlet pipe 120 can be closed.

And the control unit 250 can control the operation of the air supply unit 200 to supply compressed air to the processing space 100 through the first supply pipe 210.

Accordingly, pressure is applied to the stagnant water in the treatment space 100 using a pressurization method using compressed air, so that the stagnant water passes through the filter sheet 230 and flows into the discharge space 220, and is connected to the discharge space 220. It can be discharged to the outside through the discharge pipe 240.

Even if particles such as sand are deposited on the bottom of the filtration tank 10 and the upper part of the filter sheet 230, the stagnant water discharge unit 20 according to this embodiment removes the sand particles between the sand particles by the pressure of compressed air. By being able to discharge even residual water, it is possible to discharge as much stagnant water in the filtration tank 10 as possible.

Meanwhile, the filter sheet 230 of the stagnant water discharge unit 20 according to this embodiment is preferably made of an elastic material. This is to prevent durability from being deteriorated by allowing the outer shape of the filter sheet 230 to expand or compress appropriately in response to repeated pressure actions.

In addition, the filter sheet 230 preferably has a relatively larger area than the area of the opening 221 of the discharge space 220.

That is, as shown in FIG. 2, the filter sheet 230 is not mounted tautly in the opening 221, but is mounted with an area larger than the area of the opening 221, so that pressure is applied to the filtration tank 10 to prevent stagnant water. While the discharge process is performed, the concave shape can be maintained by bending in the direction of the discharge space 220. By increasing the surface area of the filter sheet 230, the filtration load (linear velocity) can be reduced and filtration efficiency can be improved. It becomes possible.

In addition, the stagnant water discharge unit 20 of this embodiment has one end connected to branch from the discharge pipe 240 and the other end connected to the air supply unit 200, so that the compressed air discharged from the air supply unit 200 flows into the discharge space. It may further include a second supply pipe 260 that supplies water to 220.

By providing the second supply pipe 260, compressed air from the air supply unit 200 can be injected into the discharge space 220.

The control unit 250 may control the operation of the air supply unit 200 to supply compressed air to the discharge space 220 through the second supply pipe 260 for a preset time.

At this time, the second supply pipe 260 must be branched to the front end of the third valve 241 of the discharge pipe 240, and the control unit 250 operates the air supply unit 200 and operates the third valve 241. is controlled so that the discharge pipe 240 is closed, so that the compressed air moving through the second supply pipe 260 does not leak to the outside and can be completely injected into the discharge space 220.

The injection of compressed air through the second supply pipe 260 can be performed before the filtration and discharge process of stagnant water remaining in the filtration tank 10, and the filtration is performed by injecting compressed air in the opposite direction to the direction in which filtration is performed. This is to allow backwashing of the sheet 230 to be performed.

In addition, as shown in FIG. 3, the filter sheet 230 is made of an elastic material as mentioned above and is mounted with an area larger than the area of the opening 221, so it is inflated by the compressed air injected during the backwashing process. The dome shape that is convex upward can be maintained.

Therefore, prior to the filtration process by the filter sheet 230, the particles precipitated on the upper part of the filter sheet 230 can be floated or pushed laterally, thereby impeding the filtration efficiency of the filter sheet 230 due to sediment. can be prevented.

In addition, injection of compressed air through the second supply pipe 260 can be performed immediately after discharge of stagnant water through the filter sheet 230.

In this case, the filter sheet 230 is filled with a portion of the stagnant water remaining in the sieve discharge pipe 240 that has not yet been discharged, and flows back into the discharge space 200 according to the supply of compressed air, thereby forming an upwardly convex dome shape. In other words, the state in which the bone is formed can be maintained.

At this time, it is natural that the control unit 250 opens the first valve 111 of the inlet pipe 110 and the second valve 121 of the outlet pipe 120 to release the pressure in the filtration tank 10. do.

When the filter sheet 230 is repeatedly dried and wet, the physical properties of the fibrous sheet may change, which may shorten the lifespan.

Accordingly, in the present invention, as described above, a portion of the stagnant water is filled in the discharge space 200 to ensure that the filter sheet 230 is maintained in a constant wet state, thereby preventing durability from being deteriorated due to changes in the physical properties of the sheet. In particular, when rainfall flows in, the plane of the filter sheet 230 is made convex to allow sediments to slide around the filter sheet 230, thereby preventing sediments from accumulating on the upper part of the filter sheet 230.

Hereinafter, the method of the present invention will be described with reference to FIGS. 4 and 5A to 5F.

The method of the present invention can be carried out by the above-described apparatus.

First, the initial rainwater due to rainfall is moved from the stormwater main pipe and flows into the filtration tank 10 through the inflow pipe 110, and is filtered by passing through the filter layer 140 in the filtration tank 10 and then through the outflow pipe ( Perform the discharge step through 120) (S100)

Figure 5a shows an upstream non-point pollution treatment facility as an example. The control unit 250 is capable of detecting the inflow of rainwater due to rainfall, and when the occurrence of rainfall is detected, the first valve 111 of the inlet pipe 110 is opened. ) and only the second valve 121 of the outlet pipe 120 is opened to allow the initial rainwater to flow upward and continuous filtration and discharge of the incoming initial rainwater can be performed.

Although not shown in the drawing, the control unit 250 may include a detection sensor for detecting the inflow of rainwater. At this time, the detection sensor may be a water level detection sensor.

As the inflow of rain ends, the filtration and discharge of rainwater by the filter layer 140 end together.

When the rainfall ends, as shown in FIG. 5b, undrained stagnant water remains in the treatment space 100 of the filtration tank 10. Backwashing of the filter media layer 140 is required before discharging the stagnant water. You can.

Backwashing of the filter media layer 140 may use various known backwashing methods such as force and water washing, and detailed descriptions thereof will be omitted.

After the inflow of rainfall is terminated, the stagnant water remaining in the treatment space 100 of the filtration tank 10 can be filtered and discharged to the outside using the device of the present invention described above (S200).

At this time, before step S200, sediment may be generated by sedimentation of stagnant water for a certain period of time, and in the case of such sediment, it may also be laminated on the top of the filter sheet 230 provided to filter stagnant water.

Therefore, in the method of the present invention, a step of backwashing the filter sheet 230 may be performed prior to performing step S200.

In this process, the control unit 250 operates the third valve 241 to close the discharge pipe 240 through which stagnant water moves and is discharged from communicating with the outside, and then operates the air supply unit 200 to allow compressed air to flow through the discharge pipe. It is injected into the discharge space 220 of the stagnant water discharge unit 20 through the second supply pipe 260 branching from 240.

As the compressed air is injected, the filter sheet 230 mounted on the opening 221 of the discharge space 220 is backwashed by force, thereby causing dispersion of sediment in the filter tank 10.

At this time, the filter sheet 230 is made of an elastic material and is mounted with an area larger than the area of the opening 221. As shown in Figure 5c, it is expanded by compressed air to maintain an upwardly convex dome shape, and filtration The filtration efficiency of the filter sheet 230 is prevented from being impaired by sediment by allowing the particles settled on the upper part of the sheet 230 to float or be pushed laterally.

Afterwards, as shown in FIG. 5D, filtration and drainage of stagnant water are performed using a pressure filtration method.

In this process, the control unit 250 controls the operation of the first valve 111 and the second valve 121 to close the inlet pipe 110 and the outlet pipe 120 so that the pressurization method can be applied, and then By operating the air supply unit 200, compressed air is supplied into the filter tank 10 through the first supply pipe 210, thereby causing pressure due to the compressed air to be applied to the processing space 100.

In addition, the control unit 250 controls the operation of the third valve 241 so that the discharge pipe 240 communicates with the outside, and the stagnant water flows through the filter sheet 230 by the pressure acting on the treatment space 100. As it passes, it is drained and discharged to the outside from the discharge space 220 through the discharge pipe 240.

At this time, the discharge space 220 may be equipped with a detection sensor capable of detecting the discharge of stagnant water, and the control unit 250 determines the discharge state of the stagnant water according to the detection signal of the detection sensor provided in the discharge space 220. can be judged.

When the control unit 250 determines that drainage of stagnant water is in progress, the above-described operation is maintained, and when it determines that drainage of stagnant water is complete, the control unit 250 maintains the compressed air by the air supply unit 200 as shown in FIG. 5E. Control the operation so that the injection is stopped.

When the filtration and discharge of stagnant water by this pressure filtration method is completed, the control unit 250 operates the first valve 111 and the second valve 121 again to inlet pipe 110 and outlet pipe 120. open.

At this time, the method of the present invention may further include the step of filling the discharge space 220 with a portion of stagnant water to maintain the filter sheet 230 in a wet state after step S200.

That is, as shown in FIG. 5F, the control unit 250 controls the operation of the third valve 241 to close the discharge pipe 240 through which stagnant water moves and is discharged from communicating with the outside, and the discharge pipe 240 Immediately after compressed air is injected into the discharge space 220 of the stagnant water discharge unit 20 through the branching second supply pipe 260, the second supply pipe 260 is closed to remove the remaining water in the discharge pipe 240. Part of the stagnant water flows into and fills the discharge space 220.

According to this process, as the remaining stagnant water in the discharge pipe 240 flows into and fills the discharge space 220, the filter sheet 230 maintains a wet state while forming an upward valley, thereby reducing durability due to frequent changes in physical properties. In particular, it is possible to prevent sediments from accumulating on the upper part of the filter sheet 230 by allowing sediments to slide around the convex filter sheet 230 during the next rainfall.

Although the preferred embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements made by those skilled in the art using the basic concept of the present invention defined in the following claims are also possible. falls within the scope of rights.

10: filtration tank 20: stagnant water discharge unit
100: Processing space 101: First space
102: second space 110: inflow pipe
111: first valve 120: outlet pipe
121: second valve 130: partition wall
140: filter layer 200: air supply unit
210: first supply pipe 220: discharge space
221: opening 230: filter sheet
240: discharge pipe 241: third valve
250: Control unit 260: Second supply pipe

Claims (9)

A filtration tank having a treatment space inside, an inflow pipe and an outflow pipe communicating with the treatment space on one side and the other, respectively, and a filter media layer installed in the path through which inflowed rainwater moves from the inflow pipe to the outflow pipe; and
A stagnant water discharge unit installed in the treatment space of the filtration tank and filtering and discharging stagnant water remaining after the filtration and discharge of rainwater by the filtration tank to the outside.
The filtration tank,
It includes a first valve and a second valve respectively mounted on the inlet pipe and the outlet pipe and operating to open and close,
The stagnant water discharge unit,
An air supply unit that generates and discharges compressed air, a first supply pipe installed to supply compressed air discharged from the air supply unit to the processing space, and a first supply pipe that is provided at a position lower than the floor of the processing space and has an opening formed at the top. a discharge space communicating with the treatment space, a filter sheet mounted to cover the opening of the discharge space, a discharge pipe communicating with the discharge space and allowing stagnant water flowing into the discharge space through the filter sheet to be discharged to the outside; , a control unit that controls the operation of the first valve and the second valve to close the inlet and outlet pipes, and controls the operation of the air supply unit to supply compressed air to the processing space through the first supply pipe, and the discharge pipe. It includes a third valve that is mounted on and operates to open and close, and a second supply pipe whose one end is connected to branch from the discharge pipe and the other end is connected to the air supply section so that the compressed air discharged from the air supply section is supplied to the discharge space. ,
The control unit,
Controlling the operation of the third valve to close the discharge pipe and controlling the operation of the air supply unit to supply compressed air to the discharge space through the second supply pipe for a preset time,
The filter sheet is,
A stagnant water filtration and treatment device using compressed air, wherein a portion of the stagnant water remaining in the discharge pipe flows into and fills the discharge space as the compressed air is supplied, thereby maintaining an upward valley.
delete According to clause 1,
The filter sheet is,
A stagnant water filtration device using compressed air, characterized in that it is made of an elastic material.
According to clause 3,
The filter sheet is,
A stagnant water filtration and treatment device using compressed air, characterized in that it has a relatively larger area than the area of the opening.
delete delete A step (S100) in which initial rainwater resulting from rainfall flows into a filtration tank through an inflow pipe, is filtered in the filtration tank, and is then discharged through an outflow pipe (S100); and
After the inflow of rainfall has ended, filtering the stagnant water remaining in the treatment space of the filtration tank and discharging it to the outside using the filtration treatment device according to any one of claims 1, 3, and 4 (S200); Including,
After step S200,
The discharge pipe through which the stagnant water is discharged is closed to communicate with the outside, and immediately after injecting compressed air into the discharge space of the stagnant water discharge unit through the second supply pipe branching from the discharge pipe, the second supply pipe is closed so that the remaining water in the discharge pipe is closed. A stagnant water filtration method using compressed air, further comprising maintaining the filter sheet in a state in which an upward valley is formed while a portion of the stagnant water flows into and fills the discharge space.
According to clause 7,
Before step S200,
The discharge pipe through which stagnant water is discharged is closed to communicate with the outside, and compressed air is injected into the discharge space of the stagnant water discharge unit through a second supply pipe branching from the discharge pipe to backwash the filter sheet and remove sediment from the filter tank. A stagnant water filtration method using compressed air, further comprising: inducing dispersion.
delete

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