KR101555257B1 - Non point pollutant reduction equipment using the floating filter media - Google Patents

Abstract

A filter type non-point pollutant reduction system using a floating granular filter media is disclosed. According to an embodiment of the present invention, the non-point pollutant reduction system is a three-dimensional structure buried under the ground to reduce a non-point pollutant. The present invention comprises: a pre-treatment tank where a pre-treatment is performed to remove a waste contained in initial rainwater introduced through an introduction pipe by a natural settling system; a filtering treatment tank wherein the primary treated water passing through the pre-treatment tank is introduced and filtering a fine solid contained in the primary treated water by an upflow filtering method that the primary treated water passes through a filter layer composed of a floating granular filter media; and a treatment water tank where the treated water passing through the filtering treatment tank is temporarily stored and composed to discharge the treated water to the outside when the treated water reaches a predetermined water level. Porous plates having a smaller pore size than the particle size of a granular filter media is installed in an upper portion and the lower portion of the filter layer, and a backwash pipe for supplying a backwashing air is disposed in the lower portion of the filter layer, and a backwash nozzle injecting the backwashing air for disturbing the filter layer is installed in the backwash pipe.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a non-point pollution reduction facility using a floating particulate filter,

More particularly, the present invention relates to a facility for reducing a non-point pollution source in which pollution sources are not specified. More particularly, the present invention relates to a facility for filtering pollutants mixed with rainwater using an upflow filtration method using floating particulate media, The present invention relates to a filtration type non-point pollution abatement facility using floating particulate media having a backwash function.

Water pollution sources are classified as point pollution sources and nonpoint pollution sources depending on the nature of pollution source. Point pollution sources are pollutants emitted in the form of sewage or ditches from the point of clearly recognizing pollutant emissions. Nonpoint pollutants are discharged from a large area by being washed away by rainwater, and are discharged from scattered pollutants which are difficult to understand exactly what is the source it means.

Generally, nonpoint pollution sources are also called non-specific pollution sources, surface pollution sources, mobile pollution sources, or other pollutants. Unlike point pollution sources having specific discharge paths, nonpoint pollution occurs through unspecified discharge paths such as urban road drainage and agricultural drainage. To indicate the place or area.

Non-point pollutants are mainly pollutants that run out along with surface runoffs during rainfall. They include fertilizers and pesticides applied to farmland, soil spatulas, housing spills, traffic pollutants, dust and waste in urban areas, Water, and air pollutants that have fallen on the surface of the earth.

Recently, the management of water pollution total amount management system has been strengthening the management of non-point pollutants such as roads and parking lots where inflow of pollutants intermittently occurs. In order to maintain stable water quality, There is a growing interest in road surface drainage.

Korean Patent Publication No. 0538124 discloses a water treatment system for purifying water quality through a carrier made of polyethylene and waste tires in order to efficiently treat nonpoint pollutants introduced into rivers in the treatment of nonpoint pollutants.

However, in the conventional water treatment apparatus, there is no backwash function for washing the filter medium, so that the filter layer is blocked with time, and the filtration performance and the treatment efficiency are extremely low, and maintenance costs such as replacement and cleaning of the filter medium are expensive. And maintenance is difficult, and there is a problem in that the life of the filter medium and the facility is short due to a large load applied to the filter medium during the filtration process.

Korean Patent No. 10-0538124 (Date of Notification: Dec. 21, 2005)

A problem to be solved by the present invention is to provide a filtration-type non-point pollution abatement facility using floating particulate filter material capable of effectively filtering and discharging contaminants mixed with rainwater through an upflow filtration system using floating particulate media will be.

Another object of the present invention is to provide a filtration type non-point pollution abatement facility having a backwash function for recovering filtration performance at the time of clogging of filter media.

Another object of the present invention is to provide a filtration type non-point pollution abatement facility using a floating particulate filter material capable of uniform and efficient backwashing through filter media using residual water and air in a backwash treatment tank.

Another object to be solved by the present invention is to provide a filtration-type non-point pollution abatement facility using a floating particulate filter material capable of reducing the maintenance cost by recycling the residual water remaining in the treatment tank at the time of backwashing as reverse- will be.

Another object to be solved by the present invention is to provide a filtration-type non-point pollution abatement facility using a floating particulate filter material that can be easily maintained and maintained, such as replacement of filter media, by using a floating lightweight filter material.

Another object to be solved by the present invention is to provide a floating particulate filter material capable of minimizing the filtration load on the filtration treatment tank by pretreatment such as trapping of coarse particles through a pretreatment tank and natural sedimentation of a needle bed prior to full- Filtration type non-point pollution abatement facility.

According to an aspect of the present invention, there is provided a three-dimensional structure embedded in a basement for reducing a non-point pollution source, comprising: an inlet pipe through which an initial storm flows is connected; A pretreatment screen for removing contaminants, a pretreatment tank having a drainage pump and piping for discharging residual water and backwash water; The filtration layer is formed to have a predetermined thickness by the granular filter media, and the upstream treatment filtrate through which the primary treatment water having passed through the pretreatment tank flows in from below and passes through the filtration layer is filtrated to remove fine solids contained in the primary treatment water ; And a treatment water tank having a backflow preventing baffle for storing the treated water through the filtration treatment tank and connected to an outflow pipe for external discharge of the stored treated water and surrounding the inlet of the outflow pipe at a predetermined height Wherein the particulate filter medium is a floating particulate filter material having a specific gravity smaller than that of water, and a perforated plate having a diameter smaller than that of the particulate filter material is provided on each of the filter layer, And a backwashing nozzle for injecting the backwashing air is provided in the backwash pipe. The present invention provides a filtration type nonpoint pollution abatement facility using the floating particulate matter filter.

In the present invention, the pretreatment tank and the filtration treatment tank are divided into a first partition, the filtration treatment tank and the treatment tank are divided into a second partition, and the primary treatment water may be introduced into the filtration treatment tank through the opening at the lower end of the first partition. have.

At this time, the second bank is formed higher than the top of the filtration layer by a predetermined height or higher, and the treated water through which the fine solids are removed while flowing through the filtration layer can flow into the treatment tank through the second bank.

In addition, it is preferable that the bottom of the filtration treatment tank is inclined toward the opening so that the remaining water in the filtration treatment tank at the time of backwashing can flow into the pretreatment tank.

In the present invention, the filtration layer may be composed of a lower filtration layer and an upper filtration layer. When the granular media particle size of the upper filtration layer is smaller than that of the lower filtration layer, the filtration efficiency can be further improved.

In this case, a perforated plate may be installed between the lower filtration layer lower part, the lower filtration layer, the upper filtration layer, and the upper filtration layer.

On the other hand, the backwash pipe may be connected to a backwash air supply device outside the filtration treatment tank, and the backwash air supply device may be a blewwer.

The backwash nozzle applied to the present invention may be a structure capable of drawing water in the surrounding filtration tank during backwash air injection and injecting it together.

Preferably, the backwash nozzle comprises: a nozzle tube for backwashing air; An outer tube which surrounds the nozzle tube higher than the nozzle tube and has a hole through which the water flows in a peripheral surface; And a conical nozzle shade provided at an upper end of the outer tube and having an opening formed along a lower circumferential portion thereof.

At this time, the nozzle tube has a smaller diameter as it goes to the upper part, a flow space is formed between the nozzle tube and the outer tube, the hole is located at a position communicating with the lower area of the flow space, The internal pressure of the flow space is lowered by the backwash air discharged at a high speed through the hole and the water is sucked through the hole and the water is rapidly flowed toward the nozzle shade together with the air.

In this case, a vane for imparting a rotational force to backwash air and water that has flowed toward the nozzle shade can be further formed inside the nozzle shade.

According to the embodiment of the present invention, the contaminants mixed in the rainwater can be more efficiently filtered and discharged through the upflow filtration method using the floating particulate media, and the filtration performance can be recovered through the automatic backwash when the filter media is closed It is possible to maintain the high efficiency of the filtration treatment even in the subsequent treatment.

In addition, since a mixture of air and water is used for backwashing, uniform and efficient backwashing can be performed over the floating filter media constituting the filtration layer, the filtration duration can be increased and the filtration water quality can be improved, By using water as stationary water, the maintenance cost is greatly reduced as compared with the method of backwashing the washing water (tap water) from the outside, which is advantageous in terms of economy.

Further, by using a lightweight filter material that can float, it is possible to secure easiness in maintenance such as replacement of filter media. In addition, prior to full-scale filtration, filtration is performed by pretreatment such as trapping of impurities through a pretreatment tank, The filtration load on the treatment tank can be extremely reduced, and a high-quality filtration treatment state can be maintained for a long time.

In addition, when the filtration layer is composed of two stages as required and the particle size of the granular media is different, it is possible to prevent premature clogging of the filter media, thereby maximizing the pollutant removal efficiency in the water, It is possible to expect a powerful backwash effect by blowing without a separate backwash pump by applying a nozzle that naturally draws water and ejects air and water at the same time.

In addition, since the backflow preventive baffle is arranged around the inlet of the outflow pipe for discharging the final filtration treated water at a certain height, when the water level of the water such as river or reservoir rises and flows backward, various kinds of impurities It is possible to safely protect the filtration layer in the filtration treatment tank from the contaminants introduced at the back flow.

1 is a side cross-sectional view of a nonpoint pollution abatement facility according to a first embodiment of the present invention;
2 is a plan view of a nonpoint pollution abatement facility according to a first embodiment of the present invention.
3 is a side cross-sectional view of a nonpoint pollution abatement facility in accordance with a second embodiment of the present invention.
4 is an enlarged cross-sectional view of a backwash nozzle applied to a nonpoint pollution abatement facility according to the present invention;
Fig. 5 is a perspective view of a nozzle cap provided at the tip of the backwashing nozzle of Fig. 4; Fig.
Figure 6 is an operational state diagram of the present invention during filtration.
7 is an operational state diagram of the present invention when the filtration layer is reversed.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of a nonpoint pollution abatement facility according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a side sectional view of a nonpoint pollution abatement facility according to a first embodiment of the present invention, and FIG. 2 is a plan view of a nonpoint pollution abatement facility according to the first embodiment of the present invention.

1 and 2, the non-point pollution abatement facility according to the first embodiment of the present invention is a three-dimensional structure to be buried in the ground to reduce nonpoint pollution sources, and includes a pretreatment tank 10, a filtration treatment tank 20, , And a treatment water tank (30). At this time, the pretreatment tank 10 and the filtration treatment tank 20 are divided by the first partition 15 and the filtration treatment tank 20 and the treatment water tank 30 are separated by the second partition 25.

 In the pretreatment tank 10, an inlet pipe 100 through which the initial storm flows is connected, and a pretreatment screen 110 for removing coarse contaminants contained in the initial stormwater flowing through the inlet pipe 100 is installed. A drain pump 130 for discharging residual water and backwash water is installed at the bottom of the pretreatment tank 10 and a lid (not shown) for the maintenance of the manhole 255 is provided at the upper part. The pipe (140, residual water discharge pipe) extending from the drain pump (130) extends outside the pretreatment tank (10).

The preprocessing screen 110 installed in the pretreatment tank 10 may be a three-dimensional structure having a constant volume composed of a closed bottom and a screen net. The size of the mesh of the screen net is not limited to a specific value, , Beverage cans, styrofoam, etc., and it is appropriate that fine solids and the like can pass along with the storm.

By the pretreatment screen 110 installed in the pretreatment tank 10, coarse floats such as vinyl, beverage cans and styrofoam are filtered out of contaminants introduced into the pretreatment tank 10 through the inflow pipe 100 together with the initial clearance Such as sand or soil, having a specific gravity greater than that of the water, sink to the bottom of the pretreatment screen 110 by natural sedimentation and are separated from the storm.

The filtration treatment tank 20 includes a filtration layer 210 formed to a predetermined thickness on spherical floating particulate media 212. The primary treatment water passing through the pretreatment tank 10 through the opening 200 at the lower end of the first partition 15 flows into the filtration treatment tank 20 and the introduced primary treatment water rises and the floating particulate matter material 212 through the filtration layer 210 to filter the fine solids contained in the primary treatment water.

That is, the primary treatment water pretreated through the pretreatment tank 10 flows into the lower portion of the filtration treatment tank 20 through the opening 200, and the filtration layer 210 composed of the floating particulate matter materials 212 flows downward The fine particulate matter contained in the primary treatment water is adsorbed on the particulate filter media 212 and is filtered by the filtration layer 210. As a result,

The particulate filter medium 212 may be a spherical filter having a specific gravity smaller than that of the treated water (water) so that it can float with the rise of the water level in the filtration treatment tank 20, The upper and lower portions of the particulate filter medium 212 may be formed with a perforated plate 220a having a diameter smaller than that of the particulate filter media 212 in order to restrict the rise and fall height of the particulate filter medium 212 to a predetermined height, ) 220b.

The upper perforated plate 220a and the lower perforated plate 220b define a space so that the particulate filter medium 212 can freely move only in a limited space without flowing out to other treatment tanks in the filtration treatment tank 20, The rising and falling heights of the particulate filter media 212 are limited to a certain height when the particulate filter media 212 is moved up and down according to a change in the level of the primary treated water in the tank 20.

A backwash pipe (240) for supplying backwash air is installed at a predetermined interval below the filtration layer (210). The backwashing pipe 240 is connected to a backwashing air supply device such as a blower outside the filtration treatment tank 20 and the backwashing air is strongly blown into the backwashing pipe 240 between the granular filtration media 212 A backwash nozzle 250 is provided to disturb the filtration layer 210 so that contaminants can be desorbed from the particulate media 212.

The bottom 260 of the filtration treatment tank 20 is inclined toward the opening 200 at the lower end of the first partition 15 so that the residual water in the filtration treatment tank 20 in the backwashing process is directed toward the pretreatment tank 10 The entire water is discharged from the pretreatment tank 10 through the pipe by driving the drainage pump 130. On the other hand, the treated water through which the fine solids are removed through the filtration layer 210 in the filtration process is discharged through the second partition 25 And flows into the treatment water tank 30.

The second bank 25 is formed to be higher than a top portion of the filtration layer 210 by a predetermined height or more. Therefore, a certain amount of treated water remains on the filtration layer 210. The treated water remaining on the filtration layer 210 is moved to the lower portion of the filtration treatment tank 20 together with contaminants desorbed from the disturbance of the filtration layer 210 by the discharge of residual water proceeding with backwash, The filtration layer 210 is once again washed with the downward flow of the treated water.

The filtration layer 210 constituting the filtration treatment tank 20 may be divided into a lower filtration layer 210a and an upper filtration layer 210b as in the second preferred embodiment of FIG. In this case, by changing the particle diameters of the granular filtration media 212 constituting the lower filtration layer 210b and the upper filtration layer 210a, it is possible to prevent the early clogging of the granular media 212 constituting the filtration layer 210, It is possible to maximize the removal efficiency of fine solids.

It is possible to maximize the filtration efficiency by configuring the granular material 212 of the upper filtration layer 210 to be smaller than the granular material 212 of the lower filtration layer 210. In this way, The perforated plates 220a and 220c are formed between the lower filtration layer 210 and the lower filtration layer 210 and between the upper filtration layer 210 and the upper filtration layer 210 when the upper and lower filtration layers 210 and 210 are separated into two layers. It is preferable that the granular material 212 be prevented from moving between layers and flowing out to the outside.

The treatment tank 30 is separated from the filtration treatment tank 20 through the second partition 25 formed at a predetermined height from the filtration treatment tank 20. In the treatment tank 30, the treated water that has undergone the final filtration treatment while passing through the filtration treatment tank 20 is stored, and the outflow pipe 300 for external discharge of the stored treated water is connected. And a backflow preventing baffle 310 surrounding the inlet of the outlet pipe 300 at a predetermined height.

The final treated water from which fine solids are removed while passing through the filtration layer 210 of the filtration treatment tank 20 is moved to the treatment water tank 30 through the second partition 25 to be stored therein, When the height of the pipe 300 reaches the height of the pipe 300, the pipe 300 is naturally discharged to a water system such as a river or a reservoir outside the treatment water tank 30 through the outlet pipe 300, while the inflow of various contaminants Is prevented by the anti-backflow baffle (310).

The configuration of the backwash nozzle applied for backwashing will be described with reference to FIGS. 4 to 5. FIG.

FIG. 4 is an enlarged cross-sectional view of a backwash nozzle applied to a nonpoint pollution abatement facility according to the present invention, and FIG. 5 is a perspective view of a nozzle sheath installed at the tip of a backwashing nozzle of FIG.

The backwash nozzles 250 are installed at regular intervals along the longitudinal direction in the backwash pipe 240 piped at regular intervals below the filtration layer 210. The backwashing nozzle 250 applied to the present invention is particularly effective in spraying the backwash air supplied through the backwash pipe 240 into the filtration layer 210 with a strong pressure, It is constructed so that water can be attracted naturally and injected together.

4 to 5, the backwashing nozzle 250 includes a nozzle tube 252 for backwashing air injection, a nozzle tube 252 surrounding the nozzle tube 252, And an outer tube 254 having a hole 255 through which the water flows. And a conical nozzle cap 256 provided at an upper end of the outer pipe 254 and having an opening 257 formed along the lower circumferential portion thereof.

The nozzle tube 252 has a smaller diameter as it goes to the upper part and a flow space 253 is formed between the nozzle tube 252 and the outer tube 254 and communicates with the lower area of the flow space 253 The hole 255 is formed. Accordingly, when backwashing air is discharged at a high speed from the outlet of the nozzle tube 252, the internal pressure of the flow space 253 is lowered, so that water is sucked through the holes 255, .

Vanes 258 for imparting rotational force to backwash air and water flowed toward the nozzle lid 256 may be installed in the nozzle lid 256. The vane 258 may be in the form of a plurality of vanes 258 twisted in a curved spiral toward the vertex of the nozzle jug 256 along the inner circumferential surface of the nozzle jug 256, flow < / RTI >

In other words, there is no particular limitation as long as the backwash air moving in the backwashing nozzle 250 and the vane 258 are of a type capable of causing rotational flow in the water. As such, when the backwash air and the water are rotated, Is uniformly sprayed between the particulate filter media (212) of the filtration layer (210) through the opening (257) formed along the periphery of the filtration layer (210).

The non-point pollution source processing and non-point pollution source processing after the non-point pollution processing facility according to the embodiment of the present invention described above will be described in connection with the operation of the present invention.

FIG. 6 is a view showing an operating state of the present invention in a filtration process. Referring to FIG. 6, a non-point pollution source filtering process through a non-point pollution treatment facility according to the present invention will be described.

The filtration treatment of the non-point pollution source performed through the present invention can be performed by a pretreatment for separating and removing coarse floats having a specific gravity smaller than that of water such as vinyl, can, and styrofoam, And a filtration process for filtering fine contaminants mixed with rainwater by using an upflow filtration method using the floating particulate filter material 212.

6, when the initial storm flows into the pre-treatment tank 10 through the inflow pipe 100, the coarse suspension having a specific gravity smaller than that of water among the contaminants included in the initial storm is caught by the pretreatment screen 110 Separated. And the like, such as sand or soil, having a larger specific gravity than water, sink to the bottom of the pretreatment screen 110 by natural sedimentation and are separated from the storm.

The initial rainwater removed from the pretreatment screen 110 by the needle and coarse float is introduced into the filtration treatment tank 20 through the opening located in the lower portion of the pretreatment tank 10. The initial storm that has flowed into the filtration treatment tank 20 rises and passes through the filtration layer 210 composed of the granular filtration media 212. In passing through the filtration layer 210, And adsorbed on the particulate media 212 to be separated from the adsorbent.

The ultrafiltration water filtered through the filtration treatment tank 20 and filtered to the fine contaminants is treated by overflowing the second partition 25 between the filtration treatment tank 20 and the treatment water tank 30 When the water level of the stored treated water reaches a certain level (height at which the outflow pipe is located), the water is transferred to the water system such as a reservoir or river through the outflow pipe 300 of the side of the treatment water tank 30 It is released naturally.

As the filtration treatment through the filtration treatment tank 20 is continued, the filtration layer 210 is occluded due to the fine contaminants adsorbed on the particulate media 212, and the filtration flow rate is changed, so that the treatment efficiency may be drastically lowered. Therefore, it is necessary to perform filtration by performing cleaning (backwashing) to remove fine contaminants adsorbed on the particulate filter medium 212 when the filtrate flow rate is continuously monitored and falls below the set flow rate, or when the precipitation ends.

The cleaning of the filtration layer will be described later with reference to Fig.

Referring to FIG. 7, when rainfall is terminated, backwash air is blown strongly into the filtration layer 210 by a blower to disturb the filtration layer 210, thereby removing contaminants from the particulate media 212. At the same time, the drain pump 130 of the pretreatment tank 10 is operated to discharge the residual water remaining in the pretreatment tank 10 and the filtration treatment tank 20 and the backwash water used for the backwash to the nearby sewer pipe.

The backwashing nozzle 250 provided in the backwash pipe 240 during the backwashing air blow for disturbing the filtration layer 210 naturally draws out the water in the surrounding filtration treatment tank 20 together with the backwash air blown out under a strong pressure, At this time, backwash air and water are blown toward the filtration layer 210 by the vane 258 formed in the nozzle lid 256 of the backwash nozzle 250, thereby disturbing the filtration layer 210 maximally.

The treated water that has been filled up to the height of the second partition 25 between the filtration treatment tank 20 and the treatment water tank 30 by the operation of the drainage pump 130 is discharged from the particulate media 212 by backwashing with backwash air and water And then discharged to the lower portion of the filtration treatment tank 20 together with the desolate agglomerated solid matter. At this time, the flow of the treatment water flowing downward as opposed to the filtration treatment causes the filtration layer 210 to be washed again.

According to the embodiments of the present invention as described above, the contaminants mixed in the rainwater can be more efficiently filtered and discharged through the upward flow filtration method using the floating particulate filter media, and the filtration performance is recovered through the automatic backwash It is possible to perform continuous treatment and maintain high filtration efficiency even in the subsequent treatment.

In addition, since a mixture of air and water is used for backwashing, uniform and efficient backwashing can be performed over the floating filter media constituting the filtration layer, the filtration duration can be increased and the filtration water quality can be improved, By using water as stationary water, the maintenance cost is greatly reduced as compared with the method of backwashing the washing water (tap water) from the outside, which is advantageous in terms of economy.

Further, by using a lightweight filter material that can float, it is possible to secure easiness in maintenance such as replacement of filter media. In addition, prior to full-scale filtration, filtration is performed by pretreatment such as trapping of impurities through a pretreatment tank, The filtration load on the treatment tank can be extremely reduced, and a high-quality filtration treatment state can be maintained for a long time.

In addition, when the filtration layer is composed of two stages as required and the particle size of the granular media is different, it is possible to prevent premature clogging of the filter media, thereby maximizing the pollutant removal efficiency in the water, It is possible to expect a powerful backwash effect by blowing without a separate backwash pump by applying a nozzle that naturally draws water and ejects air and water at the same time.

In addition, since the backflow preventive baffle is arranged around the inlet of the outflow pipe for discharging the final filtration treated water at a certain height, when the water level of the water such as river and reservoir rises and flows backward, various kinds of impurities It is possible to safely protect the filtration layer in the filtration treatment tank from the contaminants introduced at the back flow.

While the invention has been shown and described with reference to certain embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims. The present invention can be variously modified and changed by those skilled in the art, and it is also within the scope of the present invention.

10: Pretreatment tank 15: First partition
20: Filtration treatment tank 25: Second partition
30: Water treatment tank
100: inlet pipe 110: preprocessing screen
130: drainage pump 140: piping
200: opening 210: filtration layer
212: granular filter media 220a: upper porous plate
220b: Lower perforated plate 220c: Central perforated plate
240: backwash piping 250: backwash nozzle
260: filtration tank bottom 270: blower
300: Outflow tube 310: Non-return flow baffle

Claims (10)

As a three-dimensional structure to be buried underground in order to reduce nonpoint pollution sources,
A pretreatment screen connected to the inflow pipe through which the initial stormwater flows, a pretreatment screen for removing the contaminants contained in the initial stormwater flowing through the inflow pipe, a pretreatment tank provided with a drainage pump and piping for discharging residual water and backwash water;
The filtration layer is formed to have a predetermined thickness by the granular filter media, and the upstream treatment filtrate through which the primary treatment water having passed through the pretreatment tank flows in from below and passes through the filtration layer is filtrated to remove fine solids contained in the primary treatment water ; And
And a treatment water tank provided with an anti-backflow baffle which surrounds the inlet of the outflow pipe at a predetermined height, and a treatment water tank which is connected to an outflow pipe for external discharge of the treated water, ,
The particulate filter medium is a floating particulate filter material having a specific gravity smaller than that of water,
A perforated plate having a pore diameter smaller than that of the particulate media is provided on the upper and lower portions of the filtration layer,
A backwash pipe for supplying backwash air is disposed below the filtration layer, and a backwash nozzle for injecting backwash air is installed in the backwash pipe,
The backwash nozzle
A nozzle tube for backwash air injection;
An outer tube which surrounds the nozzle tube at a height higher than the nozzle tube and has a hole through which the water flows in a peripheral surface;
And a conical nozzle skirt provided at an upper end of the outer tube and having an opening formed along a lower circumferential portion thereof and having a vane for imparting rotational force to backwash air and water, Filtration type non - point pollution abatement facility using.
The method according to claim 1,
The pretreatment tank and the filtration treatment tank are divided into a first bank,
The filtration treatment tank and the treatment water tank are divided into a second bank,
Characterized in that the primary treatment water flows into the filtration treatment tank through the opening at the lower end of the first bank and the filtration type nonpoint pollution reduction facility using the floating particulate filter.
3. The method of claim 2,
The second bank is formed to have a height higher than a top of the filtration layer by a predetermined height,
Characterized in that the treated water having passed through the filtration layer and having the micro-solids removed therein flows into the treatment tank through the second partition, and the filtration type non-point pollution abatement facility using the floating particulate media.
3. The method of claim 2,
Characterized in that the bottom of the filtration treatment tank is inclined toward the opening portion, and the filtration type non-point pollution reduction facility using the floating particulate filter material.
The method according to claim 1,
Wherein the filtration layer comprises a lower filtration layer and an upper filtration layer,
Characterized in that the grain size of the upper filter layer is smaller than that of the lower filtration layer.
6. The method of claim 5,
A filtration type non-point pollution abatement facility using a floating particulate filter material, wherein a perforated plate is provided between the lower filtration layer lower part, the lower filtration layer and the upper filtration layer, and the upper filtration layer.
The method according to claim 1,
Wherein the backwash piping is connected to a backwashing air supply device outside the filtration treatment tank.
delete The method according to claim 1,
Wherein the nozzle tube has a smaller diameter as it goes to the upper part, a flow space is formed between the nozzle tube and the outer tube,
The hole being located at a position communicating with a lower region of the flow space,
The inner pressure of the flow space is lowered by the backwash air discharged at a high speed through the outlet of the nozzle tube and water is sucked through the hole and the water is rapidly moved toward the nozzle gud along with the air. Filtration Type Non - point Pollution Reduction Facility Using Granular Granular Media.
delete

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