KR100759985B1 - Sand filering apparatus and cleaning method for the same - Google Patents

Abstract

A sand filtering apparatus which can remove contaminants existing between filter media of the filter medium layer as well as highly viscous contaminants formed on an upper surface of a filter medium layer of the sand filtering apparatus, and a cleaning method of the sand filtering apparatus are provided. A sand filtering apparatus(1) comprises: a sand filtering tank(10) including a filter medium layer for filtering influent, the filter medium layer being divided into a plurality of filter medium chambers; a treated water channel(20) which is installed at one side of the sand filtering tank, and through which treated water filtered in the sand filtering tank flows; a moving bridge(30) installed at an upper side of the sand filtering tank and moved along the sand filtering tank; a cleaning unit(40) which is installed at a lower side of the moving bridge, and removes contaminants accumulated on the filter medium layer by ejecting air onto the filter medium layer; and a control panel(60) controlling the moving bridge and the cleaning unit to clean the filter medium layer comprised of the plurality of filter medium chambers.

Description

Sand filtering device and cleaning method for it {Sand filering apparatus and cleaning method for the same}

1 is a perspective view showing an embodiment of a filtration device according to the present invention;

FIG. 2 is a cross-sectional view of the filter device of FIG. 1 taken along line II-II; FIG.

3 is a partial cross-sectional view showing an air nozzle of the cleaning unit of the filtration device of FIG.

Figure 4 is a schematic diagram showing a state in which the cleaning unit of the filter unit of Figure 1 to clean the filter media layer of the filter compartment;

5 is a flowchart showing an embodiment of a cleaning method of a filtration device according to the present invention.

* Description of the symbols for the main parts of the drawings *

One; Filtration device 2; Influent

4; Treated water 6; Cleaning space

9; Pollutant 10; Filtration tank

13; Influent 20; With treated water

21; Treated capillary 23; discharge pipe

30; Mobile bridge 40; Cleaning unit

41; Washing hood 42; Discharge pump

43; 45 for waste discharge; Air nozzle

48; Air generator 50; Backwash

51; Backwash pump 53; Contact plate

55; Backwash pipe 60; panel

61; Water level sensor 70; Filthy waterway

71; Filth pipe

The present invention relates to a filtration device for filtering contaminated water, and more particularly, to a filtration device and a method for cleaning a filtration device capable of cleaning contaminants accumulated in the filter media layer during filtration.

In general, the filtering device is used to filter suspended particles and suspended solids contained in the final treated water of the water treatment plant and sewage treatment plant.

Such a filtration device is a gravity filtration facility using a granular filter medium, and is widely used in place of a conventional filtration facility because it is easy to operate, very easy to maintain, and can save operating cost and power.

However, such a filtration device has a high viscosity due to the accumulation of suspended particles and microorganisms on the upper surface of the filter layer of the filtration device when filtering inflow water containing untreated suspended particles and microorganisms in the final sedimentation basin. Contaminant layers may be formed. As such, when a highly viscous pollutant layer is formed on the upper surface of the filter layer of the filtration device, it is difficult to effectively treat the influent. Therefore, in order for the filtration device to process the influent smoothly, it is necessary to remove the highly viscous or contaminant layer formed on the upper surface of the filter layer.

The present invention was made in view of the above problems, and an object thereof is to provide a filtration apparatus and a cleaning method thereof capable of removing highly viscous contaminants formed on the upper surface of the filtration layer of the filtration apparatus.

In addition, another object of the present invention is to provide a filtration device and a cleaning method capable of removing not only highly viscous contaminants on the upper surface of the filter layer of the filter device, but also contaminants present between the filter medium of the filter layer.

An object of the present invention as described above, the filter medium comprising a filter medium for filtering the influent, the filter layer is divided into a plurality of filter medium; A treatment water installed at one side of the filtration tank and flowing the treated water filtered by the filtration tank; A moving bridge installed above the filtration tank and moving along the filtration tank; A washing unit installed under the moving bridge and spraying air to remove contaminants accumulated in the media layer; And a control panel for controlling the moving bridge and the cleaning unit to clean the filter layers forming the plurality of filter cells.

The cleaning unit may include: a cleaning hood covering one of the plurality of media cells to form a cleaning space; A plurality of air nozzles installed in the cleaning hood to inject air toward the filter compartment; And a discharge pump for discharging water in the cleaning space to the outside.

In addition, the filtration device is formed on the side wall of the filtration tank in contact with the treatment channel, a plurality of outlets for discharging the treated water filtered in the plurality of filter cells to the treated water; And backwashing means installed at a lower side of the moving bridge, and backflowing the treated water to the treated water through an outlet corresponding to the scrubber that is cleaned so as to backwash the scrubber that is cleaned by the washing unit.

At this time, the cleaning unit preferably further comprises a moving means for elevating the plurality of air nozzles up and down.

In addition, the control panel injects air to the plurality of air nozzles, and then operates the discharge pump.

The control panel may simultaneously operate the plurality of air nozzles and the backwashing means.

In another aspect of the present invention, an object of the present invention as described above, in the cleaning method of the filter device for removing contaminants accumulated in the plurality of filter cells in the filter device comprising a plurality of filter cells, 1 Stopping the cleaning hood above the media to be cleaned of the plurality of media; 2) separating the contaminants accumulated on the upper surface of the filter media layer of the filter media by injecting air with a plurality of air nozzles; And 3) stopping the air spraying of the plurality of air nozzles, and operating a discharge pump to discharge the pollutants separated from the filter media to the outside.

At this time, in the step 2), while spraying the air with a plurality of air nozzles, it is possible to backwash the filter media layer of the filter medium by operating the backwashing means.

Alternatively, the step of lowering the plurality of air nozzles before the step 2) may be inserted into the media layer of the media box.

Hereinafter, with reference to the accompanying drawings will be described in detail an embodiment of the filter device according to the present invention.

However, in the following description of the present invention, if it is determined that the detailed description of the related known functions or components may unnecessarily obscure the subject matter of the present invention, the detailed description and the detailed illustration will be omitted.

1 and 2, the filtration device 1 according to an embodiment of the present invention is the filtration tank 10, the treatment channel 20, the moving bridge 30, the cleaning unit 40, and And a control panel 60.

Filtration tank 10 is formed of a substantially rectangular structure, the filter layer 16 is formed on the bottom. The filter medium layer 16 is partitioned into the plurality of filter cells 15 by the filter layer separating plate 19. The media box 15 is usually formed in a width of 20 to 30 mm depending on the type of media used. The plurality of filter cells 15 is formed in a multilayer structure. That is, the uppermost layer has a filter layer 16, a porous plate 17 for supporting the filter layer 16 is provided below the filter layer 16, and the filter layer 16 is disposed below the porous plate 17. ) And a treated water cap 21 for collecting the treated water 4 passing through the porous plate 17 and flowing it to the treated water channel 20. One side of the treated water cap 21 is in communication with an outlet 23 provided on the side wall 11 of the filtration tank 10 in contact with the treated water channel 20. Therefore, the treated water 4 filtered from the plurality of filter cells 15 is discharged into the treated water passage 20 through the plurality of discharge ports 23. The filter medium layer 16 consists of granular filter media which can filter the inflow water 2. Sand, anthracite, activated charcoal, etc. are used as granular media. The porous plate 17 can pass water without passing the media. One side of the filtration tank 10 is formed with an inflow channel 13. The side wall 12 of the filtration tank 10 in contact with the inflow passage 13 is provided with a plurality of inlets 14 through which the inflow water 2 flows into the filtration tank 10. Inlet water (2) is introduced into the plurality of inlets 14 so that the filtration tank 10 can maintain a constant level at all times.

The treatment channel 20 is installed at one side of the filtration tank 10 on the opposite side of the inflow channel 13 and collects the treated water 4 filtered from the plurality of filter cells 15 of the filtration tank 10. To discharge.

The moving bridge 30 may include a bridge 31 installed to move linearly along both sidewalls 11 and 12 of the filtration tank 10 at an upper side of the filtration tank 10, and both sidewalls of the filtration tank 10 ( It is installed on the top of 11, 12 and includes a pair of rails (32) for guiding the linear movement of the bridge (31). The control panel 60 and the air generator 48 are provided above the bridge 31. In addition, a water level sensor 61 is installed below the bridge 31 to measure the height of the inflow water 2 contained in the filtration tank 10.

The cleaning unit 40 is installed below the moving bridge 30, blows contaminants 9 (see FIG. 9) accumulated in the upper portion of the plurality of filter cells 15 with air to separate the filter layer 16 from the filter layer 16. As discharged to the outside, the cleaning hood 41, a plurality of air nozzles 45, and a discharge pump 42 are included.

The cleaning hood 41 is shaped into a lampshade having a size corresponding to the length and width of one medial box 15 and covers one of the plurality of medians 15 to form a cleaning space 6. That is, the cleaning hood 41 completely covers the upper side of the filter compartment 15 ′ to be cleaned while being immersed in the inflow water 2 contained in the filtration tank 10, as shown in FIG. 4. A space 6 (hereinafter referred to as a cleaning space) is formed between the upper side of the medial chamber 15 'to be cleaned, so that the inflow water in the cleaning chamber 6 and the inflows of the upper side of the other medial chamber 15 are different. To be separated. Therefore, even if the pollutant layer formed on the upper surface of the filter compartment 15 ′ inside the cleaning hood 41 is dispersed with air, the influent 2 outside the cleaning hood 41 is not affected. A dirt discharge passage 43 is formed above the cleaning hood 41 to discharge water containing contaminants in the cleaning space 6 to the outside.

The plurality of air nozzles 45 are installed inside the cleaning hood 41 to inject air toward the pollutant layer 9 on the upper surface of the filter medium layer 16. The plurality of air nozzles 45 are communicated through the air pipe 44, the air pipe 44 is connected to the air generator 48 installed in the bridge 31 through the air hose 47. In addition, a nozzle switch (not shown) is provided between the air generator 48 and the plurality of air nozzles 45 to turn on / off the plurality of air nozzles 45. When the nozzle switch is turned on, the air of the air generator 48 is injected through the air hose 47 and the air pipe 44 through the plurality of air nozzles 45. When air is injected through the plurality of air nozzles 45, the contaminant layer 9 on the upper side of the filter medium layer 16 is separated and dispersed by the pressure of the injected air and mixed in the water of the washing space 6. . At this time, since a part of the media located above the media layer 16 also flows, the pollutant 9 is effectively separated from the media layer 16.

In addition, it is preferable that the air pipe 44 can be moved up and down by the moving means 46. At this time, when the air pipe 44 is raised, the tip of the plurality of air nozzles 45 does not touch the upper surface of the filter layer 16, and when the air pipe 44 is lowered, the tip of the air nozzle 45 is turned into the filter layer 16. It is desirable to define a certain depth of insertion. When the air nozzle 45 is inserted into the filter medium layer 16 and the high pressure air is injected, the filter material layer 16 under the pollutant 9 is dispersed from the bottom and flows upward, thereby effectively separating the pollutant 9. And disperse. As the moving means 46, since a device for converting the power of the motor into linear motion or a general linear moving device such as a pneumatic cylinder can be used, detailed description thereof will be omitted.

The discharge pump 42 discharges water in the cleaning space 6, that is, inflow water containing dispersed pollutants to the outside, and is installed above the cleaning hood 41. The suction end 42a of the discharge pump 42 communicates with the waste discharge path 43 inside the cleaning hood 41, and the discharge end of the discharge pump 42 is connected with the waste pipe 71. Therefore, when the discharge pump 42 is operated, water in the cleaning space 6 inside the cleaning hood 41 is sucked and discharged through the waste pipe 71. The waste pipe 71 is fixed to the moving bridge 30, one end of the waste pipe 71 is discharged to the outside through the waste water channel 70 installed in the filtration tank 10 is collected separately.

The cleaning unit 40 as described above can increase the efficiency of removing the contaminant layer 9 and clean the media by removing contaminants caught between the media forming the media layer 16 of the media compartment 15. It is preferable to further include a backwashing means (50).

The backwashing means 50 is installed below the moving bridge 30, and a part of the treated water 4 flowing into the treated water channel 20 is transferred to any one of the plurality of filter cells 15. A backwash pump 51, a backwash pipe 55, and an adhesion plate 53 are included to wash the filter medium layer 16 by backflowing. The backwash pump 51 is installed to be immersed in the treated water channel 20 and sucks the treated water 4 and ejects it at a constant pressure. The contact plate 53 is formed in a plate shape, and the center of the contact plate 53 is formed with a back flow hole 53a selectively communicating with a plurality of outlets 23 provided in the side wall 11 of the filtration tank 10. It is. The backflow hole 53a is formed as a long hole corresponding to the diameter of the outlet 23. The contact plate 53 is connected to the moving bridge 30 and moves along the side wall 11 of the filtration tank 10 when the moving bridge 30 moves. Therefore, when the moving bridge 30 stops at the medial chamber 15 '(refer to FIG. 4) to be cleaned, the contact plate 53 is in communication with the discharge pipe 23' of the medial chamber 15 'to be cleaned. The backwash pipe 55 connects the backwash pump 51 and the backflow hole 53a of the contact plate 53 so that the treated water 4 sucked by the backwash pump 51 flows into the contact plate 53. do. Therefore, when the backwash pump 51 is operated, the treated water 4 in the treated water channel 20 is sucked and ejected into the backflow hole 53a of the contact plate 53 through the backwash pipe 55. The treated water 4 ejected into the backflow hole 5a is ejected into the porous plate 17 through the discharge pipe 23 and the treated capillary tube 21. By the pressure of the treated water 4 jetted into the porous plate 17, the media layer 16 on the upper side of the porous plate 17 expands. Normally, when the backwash pump 51 ejects the treated water 4 at a pressure of 611 to 815 lpm / m 2, the filter medium layer 16 forming the filter compartment 15 expands by about 10 to 20%. As the filter layer 16 expands as described above, the filter media constituting the filter layer 16 flows, so that the pollutant layer 9 located above the filter layer 16 is also dispersed, and the pollutants sandwiched between the filter media are separated. It floats and moves to the upper side of the media layer 16. As described above, backwashing the treated water 4 to wash the filter medium layer 16 is referred to as reverse washing.

The control panel 60 allows the moving bridge 30 to move linearly along the filtration tank 10 and turns the nozzle switch on and off to remove the contaminants 9 of the media layer 16. The high pressure air is injected from the 45, and the discharge pump 42 is controlled to discharge the water in the cleaning space 6 including the pollutants to the outside. In addition, the control panel 60 controls the backwash pump 51 of the backwashing means 50 to backflow the treated water 4 to backwash the filter layer 16. The control panel 60 may perform a cleaning operation of controlling the cleaning unit 40 by an operator to remove contaminants formed in the media layer 16. Alternatively, when the water level of the filtration tank 10 detected by the water level sensor 61 installed in the filtration tank 10 is more than the set value, the cleaning operation is automatically started or the cleaning unit 40 is cleaned at a predetermined time interval. Can be controlled. When the cleaning operation is performed, the control panel 60 sequentially cleans the plurality of media compartments 15 while moving the movable bridge 30.

Hereinafter, the operation of the filtration device 1 according to the present invention as described above will be described with reference to FIGS. 1 to 3.

The inflow water 2 introduced through the inflow channel 13 fills the filtration tank 10 with a predetermined level through the plurality of inlets 14. The influent 4 filled with the filtration tank 10 is filtered by the filtration layer 16 partitioned into a plurality of filtration cells 15 by gravity and flows through the porous plate 17 to the treatment capillary tube 21. At this time, the inflow water 2 which passes through the filter medium layer 16 and the porous plate 17 in sequence and is discharged to the treated water capillary tube 21 becomes the treated water 4. The treated water 4 discharged to the treated water cap 21 is discharged to the treated water channel 20 through the discharge pipe 23. The treated water 4 discharged from the plurality of discharge pipes 23 into the treated water channel 20 is discharged along the treated water channel 20. In this way, the filtration device 10 continues to filter the influent (2) to make the treated water (4) to be discharged.

However, when the turbidity of the inflow water 2 is high, or when there are many suspended substances, or when high viscosity fine particles such as water droplets are contained, such contaminants accumulate on the upper surface of the filter layer 16 to form a layer. Then, the filtration efficiency of the inflow water 2 by the filter medium layer 16 falls, and the level of the filtration tank 10 rises. When the water level is above a certain level, the control panel 60 detects this through the water level sensor 61 and starts the cleaning operation.

First, the movable bridge 30 moves and stops on one of the plurality of medias 15 to be cleaned 15 '(see FIG. 4). Then, the control panel 60 injects a high pressure air to the plurality of air nozzles 45 by turning on the nozzle switch. When the air is injected, the pollutants 9 accumulated above the filter medium layer 16 are dispersed by the air pressure and mixed with water in the cleaning space 6. The control panel 60 injects air for a predetermined time, turns off the nozzle switch, blocks the plurality of air nozzles 45, and turns on the discharge pump 42. Then, water in the cleaning space 6 inside the cleaning hood 41 is discharged to the waste water channel 70 through the waste discharge passage 43 and the waste pipe 71. At this time, since the washing space 6 above the scrubbing compartment 15 'is separated by the inflow water 2 and the scrubbing hood 41 above the scrubber compartment 15, one scrubber 15 While the ') is washed, the other inlet 15 undergoes normal filtration of the influent 2. After a certain time, the control panel 60 turns off the discharge pump 42 to complete the cleaning operation. Thereafter, the moving bridge 30 is moved to clean the media layer 16 of the media box 15 next to the above method.

Another method of removing the contaminant 9 of the filter medium layer 16 is, as shown in FIG. 4, the control panel 60 controls the moving means 46 to control the plurality of air nozzles 45. 16) It is spraying high pressure air with a certain depth inserted into it. In this case, since the high pressure air is injected into the filter medium layer 16, the filter medium constituting the filter layer 16 performs more flow, so that the filter medium is efficiently stirred. At this time, the time for injecting air and the timing for descending the plurality of air nozzles 45 may be determined by experiment to increase the cleaning efficiency. That is, the air nozzle 45 may be lowered by spraying air according to the cleaning condition, or the air nozzle 45 may be controlled to eject air after being completely inserted into the media layer 16.

In order to increase the removal efficiency of the contaminant 9 on the upper side of the filter medium layer 16 and to remove the contaminants caught between the filter medium forming the filter medium layer 16, the plurality of air nozzles 45 are cleaned together. It is preferable to backwash the treated water 4 by the backwashing means 50 to perform backwashing simultaneously. In the case of backwashing, it is preferable that the plurality of air nozzles 45 are inserted into the filter medium layer 16. The operation of cleaning the filter medium layer 16 by air spraying and backwashing is as follows.

First, the washing hood 41 is stopped above the filter compartment 16 to be cleaned. Thereafter, the control panel 60 controls the moving means 46 to insert the plurality of air nozzles 45 into the filter medium layer 16 to a predetermined depth, and then turns on the nozzle switch to open the plurality of air nozzles 45. Through the high pressure air.

At the same time, the control panel 60 operates the backwash pump 51. When the backwash pump 51 operates, the treated water 4 of the treated water channel 20 is ejected to the treated water capillary 21 through the backflow hole 53a of the backwashed pipe 55 and the contact plate 53. . The treated water 4 ejected into the treated water cap 21 is ejected into the filter medium layer 16 through the porous plate 17. When the treated water 4 is ejected into the filter medium layer 16, the filter medium layer 16 expands and the filter media flows and is stirred. At this time, since the high pressure air is injected from the plurality of air nozzles 45 at the upper portion of the filter layer 16, the contaminants 9 of the upper layer of the filter layer 16 are dispersed, and stirring of the filter layer 16 is performed. More active. Then, the contaminants trapped between the dispersed upper contaminants and the media are separated from the media and floated to move to the cleaning space 6.

When a predetermined time elapses, the control panel 60 turns off the nozzle switch and the backwash pump 51 and turns on the discharge pump 42. Then, the water containing contaminants in the cleaning space 6 is discharged to the waste water channel 70 through the waste discharge path 43 and the waste pipe 71 by the discharge pump 42.

In this way, when the high-pressure air is injected into the plurality of air nozzles 45 from the upper side and the treated water 4 is flowed back from the lower side of the medial layer 16, the highly viscous contaminants 9 accumulated on the upper surface of the medial layer 16 ), Or contaminants between media can be effectively removed at the same time.

In another aspect of the present invention, an embodiment of a cleaning method of a filtration device will be described with reference to FIGS. 1 and 5.

When cleaning the plurality of filter cells 15 in the filtering device 1 having the filter tank 10 composed of the plurality of filter cells 15, first, the moving bridge 30 is moved so that the cleaning hood 41 is moved. It is made to stop on the upper side of the filter compartment 15 to be cleaned (S10).

Thereafter, the moving means 46 is controlled to lower the plurality of air nozzles 45 (S20). When the plurality of air nozzles 45 descend, the tip of the air nozzle 45 is inserted into the filter medium layer 16.

In this state, the nozzle switch is turned on to inject high pressure air into the plurality of air nozzles 45 (S30). Then, since the filter medium layer 16 is expanded by the high pressure air injected from the plurality of air nozzles 45 and the filter media flows, the pollutant layer 9 on the filter medium layer 16 is dispersed and the filter layer 16 Pollutants trapped between media located above) also become suspended from media.

If air is to be sprayed from the upper side of the media layer 16 to remove the contaminants 9 on the upper surface of the media layer 16, the step of lowering the plurality of air nozzles 45 is omitted and the air is directly injected. can do.

Subsequently, the backwashing means 50, that is, the backwash pump 51 is operated (S40). Then, the treated water 4 of the treated water channel 20 flows back through the backwash pipe 55 and is ejected from the porous plate 17 to the filter medium layer 16. Then, the media layer 16 is expanded to flow the media that make up the media layer 16. As described above, the plurality of air nozzles 45 inject high pressure air from the upper side of the medial layer 16, and the treated water 4 flows backward under the medial layer 16 to expand the medial layer 16. The contaminant layer 9 formed on the upper surface of the layer 16 and the contaminants present inside the media layer 16 are also effectively separated from the media and floated in the cleaning space 6.

When a predetermined time elapses, the plurality of air nozzles 45 and the backwash pump 51 are stopped (S50), and the discharge pump 42 is operated (S60). Then, the water containing contaminants in the cleaning space 6 is discharged to the waste water channel 70 through the waste pipe 71.

After a certain time has elapsed, the discharge pump 42 is stopped (S70), and the moving bridge 30 is moved to move the washing hood 41 to the next filter compartment 15 (S80). Thereafter, the above operation may be repeated to continuously clean the contaminants accumulated in the plurality of filter cells 15 one by one.

As described above, according to the filtration device and the cleaning method thereof according to the present invention, since the air injected from the plurality of air nozzles directly disperses the pollutants accumulated in the filter layer, it is possible to easily remove the highly viscous pollutant layer. .

Further, according to the filtration device and the cleaning method thereof according to the present invention, the high pressure air injected from the plurality of air nozzles disperses the filter layer and the contaminants on the upper side of the filter layer, and the back of the filter layer by the backwashing means. As the media layer expands, contaminants are removed efficiently.

The present invention is not limited to the above-described specific embodiments, and simple components that can be carried out by those skilled in the art without departing from the spirit of the present invention described in the claims below. Substitutions, additions, deletions, and alterations of are within the scope of the claims.

Claims (9)

A filtration tank including a filtration layer for filtering influent, wherein the filtration layer is divided into a plurality of filtration cells; A treatment water installed at one side of the filtration tank and flowing the treated water filtered by the filtration tank; A moving bridge installed above the filtration tank and moving along the filtration tank; A washing unit installed under the moving bridge and spraying air to remove contaminants accumulated in the media layer; And And a control panel for controlling the moving bridge and the cleaning unit to clean the media layers forming the plurality of media compartments. The method of claim 1, The cleaning unit, A cleaning hood covering one of the plurality of media cells to form a cleaning space; A plurality of air nozzles installed in the cleaning hood to inject air toward the filter compartment; And And a discharge pump for discharging the water in the cleaning space to the outside. The method of claim 2, A plurality of outlets formed on the sidewalls of the filtration tank in contact with the treated water channel and discharging the treated water filtered by the plurality of filtered cells into the treated water channel; And A backwashing means installed at a lower side of the movable bridge and for backflowing the treated water to the treated water through an outlet corresponding to the scrubber that is cleaned so as to backwash the scrubber that is cleaned by the cleaning unit; Filtration device. The method of claim 2 or 3, And the cleaning unit further comprises a moving means for elevating the plurality of air nozzles up and down. The method of claim 2, And the control panel injects air into the plurality of air nozzles, and then operates the discharge pump. The method of claim 3, wherein And said control panel operates said plurality of air nozzles and said backwashing means simultaneously. In the filtration method of the filtration device for removing contaminants accumulated in the plural filter cells in the filtration device comprising a plurality of filter cells, 1) stopping the cleaning hood above the media to be cleaned of the plurality of media; 2) separating the contaminants accumulated on the upper surface of the filter media layer of the filter media by injecting air with a plurality of air nozzles; And 3) stopping the air spraying of the plurality of air nozzles, and operating a discharge pump to discharge the pollutants separated from the filter media layer to the outside. The method of claim 7, wherein In step 2), at the same time injecting air to a plurality of air nozzles, at the same time by operating the backwashing means backwashing the filter layer of the filter cell, characterized in that the cleaning method of the filtration device. The method according to claim 7 or 8, And lowering the plurality of air nozzles and inserting the plurality of air nozzles into the media layer of the media compartment before the step 2).

Images