KR101136385B1 - Apparatus for treating rainwater and method for treating rainwater - Google Patents

Abstract

PURPOSE: An apparatus for treating initial rainwater and a method thereof are provided to prevent blocking of filter medium and extend exchange period of a filter unit because sludge absorbed in the filter medium inside the filter unit is removed by flowing backward target water into the filter unit, thereby reducing costs for maintenance. CONSTITUTION: An apparatus for treating initial rainwater comprises a settling tank(10), a filter tank(20), a filter unit(30), an effluent tank(40), a back washing unit(50), and a sludge storage tank(60). Initial rainwater flows into the settling tank in which earthy materials and concomitant of the initial rainwater flowed in is sunk. The rainwater, removed the earthy materials and the concomitant in the settling tank, flows into the filter tank. The filter unit is installed in the filter tank to filter the rainwater flowed into the filter tank. The water filtered by the filter unit flows into the effluent tank and temporarily stores. If the water level of the effluent tank becomes lower than predetermined level, the back washing unit allows the water in the effluent tank to flow backward into the inside of the filter unit in order to remove sludge in the filter unit. The sludge removed in the filter unit flows into the sludge storage tank.

Description

Early Rainfall Treatment System and Early Rainfall Treatment Method {Apparatus for treating rainwater and Method for treating rainwater}

The present invention relates to an initial storm treatment apparatus and an initial storm treatment method.

As industrialization and urbanization, rainfall runoff is highly contaminated. In particular, more than 80% of the total rainfall runoff is included in initial rainfall runoff.

Since such rainfall runoff flows into rivers and lakes as it is, the water quality of the basin is greatly deteriorated.

The government also stated in Article 53 of the Act on the Conservation of Water Quality and Aquatic Ecosystems (Effective Date 2007.11.18), that any workplace that causes pollution by non-point source or installs wastewater discharge facility shall report the installation of nonpoint source, Prevention facilities should be installed. ”

Annex 6 of the Enforcement Regulations of the Act on the Conservation of Water Quality and Aquatic Ecosystems categorizes non-point source reduction facilities into natural and device type facilities to induce the installation and operation of facilities suitable for the site conditions.

Natural facilities include storage facilities, artificial wetlands, infiltration facilities, vegetation-type facilities, and device-type facilities include filtration-type facilities, vortex-type facilities, screen-type facilities, flocculation sedimentation facilities, and biological treatment facilities.

The present invention relates to a filter-type facility of the device type facility, in the case of a conventional filter type facility, there is a problem that the filter medium is blocked in the process of filtering rainwater. In this case, clogging of the filter medium may reduce the filtration performance of the facility in the short term, may cause the facility itself to be shut down in the medium and long term, or additional processes and costs for replacing the filter medium may occur.

Embodiments of the present invention are to provide an initial storm treatment apparatus and an initial storm treatment method configured to prevent the blockage of the filter medium.

According to an aspect of the present invention, the initial rainwater is introduced, the sedimentation tank in which the sediment and sediments of the initial rainwater introduced is settled; A filter tank into which rainwater is introduced from the sedimentation tank to remove soil and contaminants; A filtration unit installed in the filtration tank to filter rainwater introduced into the filtration tank; A discharge tank into which the treated water filtered by the filtration unit is introduced and temporarily stored; A backwash unit for flowing back the treated water of the discharge tank into the filter unit so that sludge in the filter unit is removed when the water level of the discharge tank is lowered to a predetermined value; And a sludge storage tank connected with a sludge discharge line through which sludge removed from the filtration unit is introduced, and the introduced sludge is discharged.

At this time, the backwashing unit, a sludge moving line for moving the sludge removed from the filtration unit to the sludge storage tank; A valve installed on the sludge movement line to open and close the sludge movement line; And a discharge tank level sensor for measuring the level of the discharge tank, and when the water level measured by the discharge tank level sensor is lowered to a predetermined value, the valve may be opened so that the treated water of the discharge tank flows back into the filtration unit. .

At this time, the water level of the sludge discharge tank may be maintained lower than the water level of the discharge tank.

At this time, the back washing unit, the sludge level sensor for measuring the water level of the sludge storage tank; And a sludge pump installed on the sludge discharge line to pump the sludge from the sludge storage tank to the outside, and the sludge pump may be operated when the water level of the sludge storage tank measured by the sludge level sensor reaches a predetermined value.

In this case, the filtration unit, the housing in which the rainwater inlet through which the rainwater from the filtration tank is introduced and the sludge discharge port through which the sludge is discharged are formed; A filter material filled in the housing to filter rainwater introduced into the housing; And a strainer installed in the housing so that the rainwater filtered by the filter medium is discharged.

In this case, the backwashing unit may further include an air injection unit for injecting air into the filtration unit when the treated water in the discharge tank flows back to the filtration unit.

At this time, the air injection unit, an air compressor for providing compressed air; An air moving line for delivering the compressed air provided by the air compressor to the filtration unit; And an air nozzle connected to the air moving line and disposed inside the filtration unit such that air is injected into the filtration unit.

In this case, the filtration unit may further include a gravel layer for supporting the filter medium against the inner surface of the housing in which the strainer is installed, and the air nozzle may be interposed between the inner surface of the housing in which the strainer is installed and the gravel layer.

On the other hand, the filtration unit is made of a plurality, the plurality of filtration unit may be supported by a module grid disposed on one side of the filtration tank.

On the other hand, the treated water outlet formed in the discharge tank to discharge the treated water may be located lower than the initial rain inlet formed in the sedimentation tank so that the initial rain is introduced.

According to another aspect of the invention, the step of sedimentation of soil and sediments of the initial rainwater in the sedimentation tank; Moving the rainwater to the filter tank from which the soil and contaminants have been removed; Filtering rainwater of the filtration tank through a filtration unit installed in the filtration tank; Moving the treated water filtered by the filtration unit to the discharge tank; When the water level of the discharge tank is lower than a predetermined value, washing the inside of the filtration unit by flowing the treated water of the discharge tank back into the filtration unit so that sludge in the filtration unit is removed; And moving the sludge removed from the filtration unit to the sludge storage tank.

At this time, when the treated water of the discharge tank flows back into the filtration unit, the water level of the sludge storage tank is kept lower than the level of the discharge tank and the compressed air is injected through the air nozzle may be made backwashing of the sludge accumulated in the filtration unit.

According to embodiments of the present invention, by flowing the treated water back into the filter unit to remove the sludge adsorbed to the filter medium inside the filter unit, the blockage of the filter medium is prevented, the replacement time of the filter unit is long, maintenance The cost can be significantly reduced.

1 is a plan view of the initial storm water treatment apparatus according to an embodiment of the present invention,
2 is a cross-sectional view taken along line AA of FIG.
3 is a cross-sectional view taken along line BB of FIG. 1.
Figure 4 is a cross-sectional view of the filtration unit included in the initial rainwater treatment apparatus according to an embodiment of the present invention,
5 is a view from above of the filtration unit included in the initial rainwater treatment apparatus according to an embodiment of the present invention,
6 is a plan view of the module lattice on which the filtration unit of the initial rainwater treatment system according to the present embodiment is mounted,
7 is a view of the air nozzle of the air injection unit included in the initial storm water treatment apparatus according to an embodiment of the present invention as viewed from above,
8 and 9 are diagrams for explaining an initial storm water treatment method according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings, in the following description with reference to the accompanying drawings, the same or corresponding components are given the same or corresponding reference numerals and duplicate description thereof. Will be omitted.

1 is a plan view of the initial rainwater treatment apparatus according to an embodiment of the present invention, Figure 2 is a cross-sectional view A-A of Figure 1, Figure 3 is a cross-sectional view B-B of FIG.

1 to 3, the initial rainwater treatment system 1 according to the present embodiment includes a sedimentation tank 10, a filtration tank 20, a filtration unit 30, a discharge tank 40, and an inverse The washing part 50 and the sludge storage tank 60 are included. The initial rainwater treatment device 1 discharges the treated water by filtering the initial rainwater flowing in when it rains, but when the rain stops and the water level of the discharge tank 40 decreases, the treated water of the discharge tank 40 is discharged from the filtration unit 30. By countercurrent to the inside to remove the sludge adsorbed to the filter medium 32 in the filter unit 30, to prevent the clogging of the filter medium 32 generated in the conventional filter unit 30, the initial rainwater treatment device (1) Can improve the operation rate.

Hereinafter, the configuration of the initial stormwater treatment apparatus 1 according to this embodiment will be described in detail with reference to FIGS. 1 to 3.

When it rains, the initial rainwater flows into the settling tank 10. The initial rainwater is introduced into the sedimentation tank 10 through an initial rainwater inflow line 11 connected with the sedimentation tank 10. Initial rainwater inlet line 11 is connected to the initial rainwater inlet 12 formed in the settling tank (10). At this time, the initial storm inflow line 11 may be bent toward the bottom of the sedimentation tank 10 past the initial storm rain inlet 12, but is not limited thereto. Soil and contaminants of the initial rainwater flowing into the sedimentation tank 10 is settled to the bottom of the sedimentation tank (10).

Rain and sand are removed from the sedimentation tank 10 is introduced into the filter tank (20). In this case, the rectifying wall 72 may be interposed between the settling tank 10 and the filtration tank 20 in which a plurality of rectifying holes 73 are dispersed. In this case, when rainwater moves from the sedimentation tank 10 to the filtration tank 20, short-circuit flow is prevented from occurring and the filtration efficiency can be increased.

According to the present embodiment, the settling tank 10 and the filtration tank 20 are disposed adjacent to each other around the rectifying wall 72. At this time, since the sedimentation tank 10 and the filtration tank 20 are connected in fluid communication by the rectification hole 73 formed in the rectification wall 72, the level of the sedimentation tank 10 and the filtration tank 20 is the same. Can be maintained.

Rainwater introduced into the filtration tank 20 is filtered by the filtration unit 30 installed in the filtration tank 20. 4 is a cross-sectional view of the filtration unit included in the initial storm treatment apparatus according to an embodiment of the present invention, Figure 5 is a view of the filtration unit included in the initial storm treatment apparatus according to an embodiment of the present invention from the top side. . 4 and 5, the filtration unit 30 according to the present embodiment may include a housing 31, a filter medium 32, and a strainer 33.

The rainwater inlet 31a through which rainwater from the filtration tank 20 flows is formed in the housing 31. Rainwater inlet 31a may be disposed on the upper surface of the housing 31, but is not limited thereto.

The housing 31 is formed with a sludge discharge port 31b through which sludge removed from the filter medium 32 is discharged to the outside in a backwashing process to be described later. The sludge outlet 31b may be disposed on the upper surface of the housing 31 like the rainwater inlet 31a, but is not limited thereto.

The filter medium 32 is filled in the housing 31. The filter medium 32 filters the contaminants contained in the rainwater introduced into the housing 31. Contaminants may be adsorbed onto the filter medium 32 while the filter medium 32 filters the pollutants having excellent rainwater. At this time, the contaminants adsorbed on the filter medium 32, that is, the sludge may be removed from the filter medium 32 by the backwashing unit 50 to be described later, which will be described later.

Filter medium 32 may include, for example, anthracite and activated carbon. Anthrate has high turbidity removal efficiency, and activated carbon has excellent adsorption capacity.

The rainwater filtered by the filter medium 32 is discharged through the strainer 33. The strainer 33 passes only the treated water filtered by the filter medium 32 and does not pass the filter medium 32. The strainer 33 may be coupled to the housing 31 by a hollow bolt 75. At this time, the treated water passing through the strainer 33 is discharged to the outside through the hollow portion of the bolt (75).

The strainer 33 may be installed on the bottom surface of the housing 31, but is not limited thereto. When the strainer 33 is installed on the bottom surface of the housing 31, the treated water filtered by the filter medium 32 may be discharged to the lower side of the housing 31. At least one strainer 33 may be installed in the housing 31. When there are a plurality of strainers 33, the plurality of strainers 33 may be arranged to be spaced apart from each other on the bottom surface of the housing 31.

The filtration unit 30 according to the present embodiment may further include a gravel layer 34 disposed inside the housing 31. The gravel layer 34 supports the filter medium 32 against the inner surface of the housing 31 in which the strainer 33 is installed. Referring to FIG. 4, the gravel layer 34 is positioned below the filter medium 32, and supports the filter medium 32 with respect to the bottom surface of the housing 31 in which the strainer 33 is installed. The gravel layer 34 helps to smoothly flow the air by the air injection unit 56 to be described later in the process of backwashing the filtration unit 30 to the filter medium (32).

The filtration unit 30 configured as described above may be modularized and manufactured in large quantities. Accordingly, when a problem occurs in the filtration unit 30 in use, the filtration unit 30 may be easily replaced with another filtration unit 30. Becomes easy.

According to this embodiment, a plurality of filtration units 30 may be used. The plurality of filtration units 30 may be distributedly disposed on the bottom surface of the filtration tank 20. In this case, the plurality of filtration units 30 may be mounted on a module grid (see FIG. 6) disposed at the bottom of the filtration tank 20. For reference, Figure 6 is a plan view of the module lattice on which the filtration unit of the initial storm water treatment apparatus according to this embodiment is mounted. When the plural filtration units 30 are mounted on the module lattice as described above, the filtration unit 30 is easily installed, maintained, and repaired.

1 to 5, the treated water filtered by the filtration unit 30 is introduced into the discharge tank 40. The introduced treated water is temporarily stored in the discharge tank 40 and then discharged to the outside. The discharge tank 40 is formed with a treatment water outlet 42 through which treatment water is discharged, and the treatment water outlet 42 is connected to the treatment water discharge line 41.

As shown in FIG. 2, the discharge tank 40 may have a cross-section having a 'B' shape as a whole and may be formed to be adjacent to the bottom and side surfaces of the filtration tank 20, but is not limited thereto.

According to this embodiment, the treated water filtered by the filtration unit 30 can automatically move to the discharge tank (40).

In this regard, the settling tank 10, the discharge tank 40, and the filtration tank 20 may be connected in fluid communication. In this case, there may be a time difference in which each tank is filled, but the water level of each tank becomes the same after a predetermined time elapses. For example, when rain starts and initial rainwater enters the sedimentation tank 10, the sedimentation tank 10, the filtration tank 20 and the discharge tank 40 are sequentially and partially filled. Thereafter, when a predetermined time elapses, the water level of the settling tank 10, the filtration tank 20, and the discharge tank 40 becomes the same, and rises at the same speed. In this process, the treated water filtered by the filtration unit 30 is automatically moved to the discharge tank (40). According to this embodiment as described above, it is not necessary to use a separate pump, etc. to move the treated water filtered by the filtration unit 30 to the discharge tank 40, the installation is easy and the cost is reduced.

When the water level of the discharge tank 40 rises and becomes higher than the treated water outlet 42, the treated water of the discharge tank 40 may be automatically discharged to the outside through the treated water outlet 42. In this case, the treatment water outlet 42 is preferably located lower than the initial rainwater inlet 12 so that the treatment water discharged through the treatment water outlet 42 is smoothly discharged.

Alternatively, if the constraints such as cost are not taken into consideration, the treated water filtered by the filtration unit 30 by a separate pump is forcibly moved to the discharge tank 40 or the treated water of the discharge tank 40 is externally provided. Can be discharged.

The initial storm water treatment apparatus 1 according to the present embodiment further includes a backwash unit 50.

The backwashing unit 50 flows the treated water of the discharge tank 40 back into the filtration unit 30 so that sludge in the filtration unit 30 is removed when the water level of the discharge tank 40 is lower than a predetermined value. Clean the inside of the filtration unit (30).

The water level of the discharge tank 40 in which the backwash 50 is operated may be determined by, for example, the height of the treated water outlet 42. If the rain stops and there is no inflow of the initial rainwater, the water level of the discharge tank 40 naturally lowers. At this time, since the water level of the discharge tank 40 is maintained higher than the treated water outlet 42 until the rain stops and a predetermined time elapses, the treated water filtered by the filtration unit 30 flows into the discharge tank 40. It may be discharged to the outside through the treated water outlet 42.

Thereafter, when a predetermined time elapses, the water level of the discharge tank 40 is lower than the height of the treated water outlet 42. In this case, the treated water by the filtration unit 30 can no longer be discharged to the outside through the treated water outlet 42. The backwash unit 50 may operate when the treated water is no longer discharged through the treated water outlet 42 after the rain stops. In other words, the backwashing unit 50 may be operated when the water level of the discharge tank 40 is lower than the height of the treated water outlet 42 after the rain stops.

The backwashing unit 50 according to the present embodiment may include a sludge movement line 51, a valve 52, and a discharge tank level sensor 53. The sludge moving line 51 provides a passage for moving the sludge removed from the filter medium 32 to the sludge storage tank 60 by the treated water flowing back to the filtration unit 30. The sludge movement line 51 is connected to the sludge outlet 31b formed in the housing 31. The sludge movement line 51 may include a sludge main line 51a directly connected to the sludge storage tank 60, and a sludge subline 51b branched from the sludge main line 51a and connected to the filtration unit 30. . In this case, the plurality of filtration units 30 may be connected to the sludge main line 51a through the sludge subline 51b.

On the sludge movement line 51, the valve 52 which opens and closes the sludge movement line 51 is provided. At this time, the valve 52 may be installed in the sludge main line 51a as shown in FIG. 1, but is not limited thereto.

The backwashing unit 50 operates to clean the inside of the filtration unit 30 when the water level of the discharge tank 40 is lower than a predetermined value, for example, the height of the treated water outlet 42. At this time, the discharge tank level sensor 53 is used to measure the water level of the discharge tank (40).

According to this embodiment as described above, when the water level of the discharge tank 40 measured by the discharge tank level sensor 53 is lowered to a predetermined value, the valve 52 is opened, and the treated water of the discharge tank 40 is The sludge adsorbed to the filter medium 32 is removed by flowing back into the filtration unit 30. Subsequently, the sludge removed from the filter medium 32 moves to the sludge storage tank 60 which will be described later through the sludge moving line 51 opened together with the countercurrent treated water.

The sludge storage tank 60 temporarily stores the sludge removed from the filtration unit 30. The sludge introduced into the sludge storage tank 60 is discharged to the outside through the sludge discharge line 61 connected to the sludge storage tank 60.

According to the present embodiment, the backflow of the treated water in the backwashing process by the backwashing unit 50 may be automatically performed by the pressure difference between the discharge tank 40 and the sludge storage tank 60. At this time, the water level of the sludge storage tank 60 should be kept lower than the water level of the discharge tank (40).

To this end, the initial storm water treatment apparatus 1 according to the present embodiment may further include a sludge level sensor 54 and a sludge pump 55. The sludge level sensor 54 is used to measure the level of the sludge reservoir 60. The sludge pump 55 is used to pump the sludge out of the sludge storage tank 60.

When the water level of the sludge storage tank 60 measured by the sludge level sensor 54 reaches a predetermined value, the sludge pump 55 is operated to pump the sludge of the sludge storage tank 60 to the outside, whereby the sludge storage tank 60 The water level of is maintained lower than the water level of the discharge tank (40).

The water level at which the sludge pump 55 operates may be determined, for example, by the level of the discharge tank 40 at which the operation of the backwashing unit 50 to be described later is stopped. At this time, when the operation of the backwashing unit 50 is stopped, since the sludge of the filtration unit 30 is no longer introduced into the sludge storage tank 60, it is necessary to keep the level of the storage tank lower than the level of the discharge tank 40. none.

According to the present embodiment, the backwashing unit 50 may further include an air spray unit 56. The air injector 56 injects air into the filtration unit 30 when the treated water of the discharge tank 40 flows back to the filtration unit 30. In this case, the jetted air as well as the counter flowed water collide with the sludge adsorbed on the filter medium 32 to effectively remove the sludge.

The air injector 56 may inject air in the reverse flow direction of the treated water. In this case, the flow rate increases due to the interaction of the treated water and the air, so that the sludge can be more effectively removed from the filter medium 32.

According to the present embodiment, the air injector 56 includes an air compressor 57 for providing compressed air and an air moving line 58 for delivering the compressed air provided from the air compressor 57 to the filtration unit 30. ), And an air nozzle connected to the air moving line 58 and positioned inside the filtration unit 30.

The air compressor 57 provides compressed air to the air nozzle side. The air compressor 57 may be disposed outside the filtration tank 20, but is not limited thereto.

The air movement line 58 may include an air main line 58a directly connected to the air compressor 57, and an air sub line 58b branched from the air main line 58a and connected to the filtration unit 30. . In this case, the plurality of filtration units 30 may be connected to the air main line 58a through the air subline 58b. At this time, an air branch line 58c may be interposed between the filtration unit 30 and the air subline 58b. The air branch line 58c may branch from the air sub line 58b and extend to the inner lower end of the filtration unit 30.

7 is a view of the air nozzle of the air injection unit included in the initial storm water treatment apparatus according to an embodiment of the present invention viewed from above. Referring to FIG. 7, the air nozzle 59a may be formed on an upper surface of the air chamber 59 disposed on the bottom surface of the housing 31. The air chamber 59 is connected with the air branch line 58c. The air provided by the air compressor 57 moves to the air chamber 59 through the air branch line 58c and is injected into the housing 31 through a nozzle formed on the upper surface of the air chamber 59.

Referring to FIG. 4, the air chamber 59 is interposed between the bottom surface of the housing 31 in which the strainer 33 is installed and the gravel layer 34. In this case, the air injected through the air nozzle 59a (see FIG. 7) formed on the upper surface of the air chamber 59 can easily move toward the filter medium 32 through the gravel layer 34.

According to this embodiment, the air chamber 59 in which the air nozzle 59a (see FIG. 7) is formed is disposed on the bottom surface of the housing 31 as can be seen in FIG. In this case, the air chamber 59 may be manufactured integrally with the filtration unit 30 inside the housing 31, and the filtration unit 30 including the air chamber 59 may be modularized.

The initial stormwater processing apparatus 1 according to the present embodiment may further include a controller 80. The controller 80 controls the backwashing process.

1 to 4, the controller 80 may control the sludge moving line 51 when the value measured by the discharge tank level sensor 53 is lower than a predetermined value so that the operation of the backwash unit 50 is started. The valve 52 installed on the top) is opened to start the backwashing process.

Subsequently, the controller 80 operates the sludge pump 55 when the value measured by the sludge level sensor 54 reaches a predetermined value to operate the sludge pump 55 while the backwashing process is performed. By discharging the sludge of 60 to the outside, the water level of the sludge storage tank 60 is kept lower than the water level of the discharge tank 40.

Then, the controller 80 is a valve 52 provided on the sludge movement line 51 when the value measured by the discharge tank water level sensor 53 is lower than the predetermined value so that the operation of the backwash unit 50 is stopped. To stop the backwash process.

Although not shown, the initial stormwater treatment apparatus 1 according to the present embodiment may further include a sedimentation tank manhole, a sludge storage tank manhole, a filtration tank manhole, and a discharge tank manhole. Settling manholes are used to collect soil and contaminants that have settled in the settling tank 10. The sludge storage tank manhole is used to manage the sludge pump 55 disposed in the sludge storage tank 60, the filtration tank manhole is used to manage the filtration unit 30 disposed in the filtration tank 20, the discharge tank manhole is discharged Used to manage the jaw 40.

8 and 9 are diagrams for explaining an initial storm water treatment method according to an embodiment of the present invention. For reference, arrows in FIG. 8 and FIG. 9 mean the direction of the fluid.

Hereinafter, an initial storm water treatment method according to an embodiment of the present invention will be described with reference to FIGS. 8 and 9. However, the applicant will be based on the initial storm treatment apparatus 1 described above in describing the initial storm treatment method according to the present embodiment, but this is for convenience of description and does not limit the method according to the present embodiment. .

The initial rainwater treatment method according to the present embodiment includes a filtration process and a backwashing process, and the filtration process and the backwashing process will be described in detail with reference to FIGS. 8 and 9, respectively.

Filtration process

When rain falls, the initial rainwater flows into the settling tank 10. Soil and contaminants of the initial rainwater introduced into the sedimentation tank 10 is settled to the bottom of the sedimentation tank (10).

Rainwater from which the soil and contaminants have been removed moves to the filtration tank 20.

Rainwater introduced into the filtration tank 20 is filtered through the filtration unit 30 installed in the filtration tank 20.

The treated water filtered by the filtration unit 30 moves to the discharge tank 40. At this time, since the sedimentation tank 10, the filtration tank 20, and the discharge tank 40 are connected in fluid communication, when the initial rainwater enters the sedimentation tank 10, the treated water filtered by the filtration unit is automatically discharged. It may be introduced into the tank (40).

The treated water introduced into the discharge tank 40 is temporarily stored in the discharge tank 40 and then discharged to the outside through the treated water outlet 42 formed in the discharge tank 40.

Backwash  fair

If the rain stops and there is no inflow of the initial rainwater, the water level of the discharge tank 40 naturally lowers. At this time, when the water level of the discharge tank 40 is lower than the predetermined value, for example, the height of the treated water outlet 42 (see Fig. 8) of the discharge tank 40, the discharge tank 40 The treated water flows back into the filtration unit 30. The countercurrent treated water removes the sludge adsorbed to the filter medium 32 in the filter unit 30 from the filter medium 32. At this time, the compressed air provided from the air compressor 57 is injected into the filtration unit 30 through the air movement line 58, and the air injected from the filtration unit 30 is filtered along with the counter-flowing water. The sludge adsorbed in the) can be effectively removed.

When the water level of the discharge tank 40 is lower than a predetermined value to start the backwashing process, the discharge tank level sensor 53 detects this and the valve 52 installed on the sludge movement line 51 is opened. At this time, since the water level of the discharge tank 40 is higher than the water level of the sludge storage tank 60, the treated water of the discharge tank 40 automatically flows back to the filtration unit 30 through the sludge moving line 51 together with the sludge. The sludge storage tank 60 is moved. At this time, the rainwater of the filtration tank 20 may be introduced into the filtration unit 30. In this case, the rainwater of the filtration tank 20 together with the treated water and the sludge may be introduced into the sludge storage tank 60 through the sludge movement line 51.

In order to automatically flow back the treated water of the discharge tank 40 to the filtration unit 30, the level of the sludge storage tank 60 should be kept lower than the level of the discharge tank 40. At this time, when the water level of the sludge storage tank 60 reaches a predetermined value so that the sludge pump 55 is operated, the sludge pump 55 installed on the sludge discharge line 61 is operated to discharge the sludge of the sludge storage tank 60. By lowering the water level of the sludge storage tank (60).

Thereafter, when the water level of the discharge tank 40 is lowered to a predetermined value such that the backwashing process is completed while the backwashing process is performed, the valve 52 installed on the sludge moving line 51 is closed, and the air compressor 57 ) Will stop working. This completes the backwashing process. Thereafter, the initial storm water treatment apparatus 1 is in a standby state until the next rain.

While the present invention has been described in connection with what is presently considered to be the most practical and preferred embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

10: sedimentation tank 20: filtration tank
30: filtration unit 40: discharge tank
50: backwash 60: sludge storage tank
70: module grid 80: control unit

Claims (12)

A sedimentation tank in which initial rainwater is introduced and sediment and sediments of the initial rainwater introduced are settled;
A filter tank into which rainwater is removed from the sedimentation tank to remove soil and contaminants;
A filtration unit installed in the filtration tank to filter rainwater introduced into the filtration tank;
A discharge tank into which the treated water filtered by the filtration unit is introduced and temporarily stored;
A backwash unit for flowing back the treated water of the discharge tank into the filter unit so that sludge in the filter unit is removed when the level of the discharge tank is lowered to a predetermined value; And
Initial sludge treatment apparatus including a sludge storage tank is connected to the sludge discharge line is introduced into the sludge removed from the filtration unit, the sludge discharged.
The method of claim 1,
The backwashing unit,
A sludge moving line for moving the sludge removed from the filtration unit to the sludge storage tank;
A valve installed on the sludge movement line to open and close the sludge movement line; And
Includes a discharge tank level sensor for measuring the water level of the discharge tank,
And the valve is opened so that the treated water of the discharge tank flows back into the filtration unit when the water level measured by the discharge tank level sensor is lowered to a predetermined value.
The method of claim 2,
The initial storm water treatment apparatus, characterized in that the water level of the sludge storage tank is maintained lower than the water level of the discharge tank.
The method of claim 3,
The backwashing unit,
A sludge level sensor for measuring the level of the sludge storage tank; And
A sludge pump installed on the sludge discharge line to pump sludge out of the sludge storage tank,
And the sludge pump is operated when the water level of the sludge storage tank measured by the sludge level sensor reaches a predetermined value.
5. The method according to any one of claims 1 to 4,
The filtration unit,
A housing having a rainwater inlet through which the rainwater of the filtration tank is introduced and a sludge discharge port through which the sludge is discharged;
A filter material filled in the housing to filter rainwater introduced into the housing; And
And a strainer installed in the housing so that the rainwater filtered by the filter medium is discharged.
The method of claim 5,
The backwashing unit,
And an air injector for injecting air into the filtration unit when the treated water of the discharge tank flows back to the filtration unit.
The method of claim 6,
The air injection unit,
An air compressor providing compressed air;
An air moving line for delivering compressed air provided by the air compressor to the filtration unit; And
And an air nozzle connected to the air moving line and disposed inside the filtration unit such that air is injected into the filtration unit.
The method of claim 7, wherein
The filtration unit further comprises a gravel layer for supporting the filter medium against an inner surface of the housing in which the strainer is installed,
And the air nozzle is interposed between the inner surface of the housing in which the strainer is installed and the gravel layer.
The method of claim 5,
The filtration unit is made of a plurality,
The plurality of filtration unit is an initial storm treatment apparatus, characterized in that supported by the module grid disposed on one side of the filtration tank.
The method of claim 5,
The initial rainwater treatment device, characterized in that the treated water outlet formed in the discharge tank so that the treated water is discharged lower than the initial rainwater inlet formed in the sedimentation tank so that the initial rainwater is introduced.
In the initial storm treatment method,
Sedimentation of soil and sediments of the initial stormwater in the sedimentation tank;
Moving the rainwater to the filter tank from which the soil and contaminants have been removed;
Filtering the rainwater of the filtration tank through a filtration unit installed in the filtration tank;
Moving the treated water filtered by the filtration unit to a discharge tank;
When the water level of the discharge tank is lower than a predetermined value, washing the inside of the filtration unit by flowing the treated water of the discharge tank back into the filtration unit so that sludge in the filtration unit is removed; And
And the sludge removed from the filtration unit is moved to a sludge storage tank.
The method of claim 11,
When the treated water of the discharge tank flows back into the filtration unit, the water level of the sludge storage tank is maintained lower than the level of the discharge tank.

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