KR20230043288A - Filtration device for excretions and livestock secession filtrate - Google Patents

Abstract

The present invention relates to a filtration apparatus using floating filter media, comprising: a filtration tank in which floating filter media is accommodated, wherein influent flowing in through one side is filtered into treated water by the floating filter media, and the treated water is discharged through an upper portion of the filtration tank; a strainer located above the filtration tank and configured to enable the treated water to pass therethrough and prevent the floating filter media from passing therethrough; a stirring wing located inside the filtration tank; a detection sensor which detects the amount of the floating filter media inside the filtration tank; and a floating filter media replenishment unit which supplies the floating filter media to the filtration tank, wherein the floating filter media is additionally supplied to the filtration tank by the floating filter media replenishment unit when the amount of the floating filter media detected by the detection sensor is less than a preset amount. Accordingly, the filtration apparatus can perform filtration by automatically supplementing the floating filter media when the amount of the floating filter media inside the filtration tank is reduced.

Description

Excretion and livestock manure treatment facility filtration filtrate {Filtration device for excretions and livestock secession filtrate}

The present invention relates to a filtration device using flotation media.

The flotation media is a specially manufactured lightweight media unlike media such as sand generally used in conventional top-down filtration devices, and its specific gravity is lighter than that of water, so it floats when inflow water flows into the filtration tank.

In the case of sand, which is a previously used filter medium, the specific gravity is about 2.7, whereas the specific gravity of the flotation filter medium is about 0.03 to 0.05, which is lower than that of water, but is not limited thereto.

By using a flotation filter medium having a low specific gravity as described above, it has the advantage of being easy to transport and replace the filter medium, so it is widely used recently.

In addition, the flotation filter medium is easier to completely desorb and remove the dirt collected in the filter medium layer compared to the conventional backwashing and cleaning of the filter medium.

In addition, the flotation filter material is made of a material having elasticity and has excellent collection ability and good cleaning efficiency, so it can be widely applied to sewage, sewage, wastewater, effluent, groundwater, industrial water, livestock manure, and the like.

Patent Document 1 discloses a filtration device using a floating filter medium. However, the filtering device disclosed in Patent Document 1 does not disclose supplementation or replacement of the flotation filter material at all, and when the life of the flotation filter material is over, there is a problem in that it must be supplemented separately.

In addition, in the case of a filter device using a flotation filter medium, there is a problem that the flotation filter medium that can be reused flows out together with the sewage flowing out after washing the flotation filter medium and is lost. The loss of the floating filter medium is prevented to some extent by stopping the outflow of sewage when it approaches the bottom. do.

In addition, when influent with high turbidity flows in, the filtration load of the flotation filter increases, which means that frequent cleaning is required. However, there is a disadvantage in that it is impossible to clean dirt attached to the inner wall of the filter tank.

In addition, although the cleaning efficiency of the floating filter medium is increased by using the stirring blades, it is considered that a means for increasing the cleaning efficiency should be devised depending on the properties of the influent water.

KR 89-003071 B1

Accordingly, the present invention has been devised to solve the problem by focusing on the problems of the prior art, and it is possible to supplement, reuse, prevent loss of floating filter media, extend life, reuse treated water as cleaning water, and improve cleaning effect. It is an object to provide a filtering device that does.

In order to achieve the above object, the present invention is a filter tank in which the flotation media is accommodated, and the inflow water flowing into one side is filtered by the flotation media, and the treated water flows out to the top; a strainer positioned above the filtration tank and configured to pass the treated water and not pass the flotation filter media; Agitation blades located inside the filtration tank; a sensor for detecting the amount of floating filter media in the filtration tank; and a filter medium replenishing unit supplying the floating filter medium to the filtration tank, wherein, when the amount of the floating filter medium detected by the detection sensor is less than a predetermined amount, the floating filter medium is additionally supplied from the filter medium supplementing unit to the filter tank. It provides a filtering device to ensure that it is supplied.

a solid-liquid separation unit into which sewage discharged from the filtration tank is introduced and separating reusable flotation media from among the flotation media contained in the waste water; and a washing water supply unit supplying the washing water to the filtration tank, and the floating filter medium separated in the solid-liquid separation unit is preferably supplied to the filter medium replenishing unit.

The solid-liquid separation unit preferably includes a sewage storage tank in which sewage flowing from the filtration tank is stored, and a scraper positioned above the sewage storage tank.

When sewage is discharged from the filtration tank to the solid-liquid separator, it is preferable that washing water is additionally supplied to the filtration tank.

a turbidity sensor for measuring the turbidity of the inflow water flowing into the filtration tank; and a coagulant supply unit supplying the coagulant to the filtration tank, wherein the coagulant is preferably supplied from the coagulant supply unit to the filtration tank when the turbidity of the influent measured by the turbidity sensor exceeds a predetermined turbidity level. do.

A nozzle body located above the filtration tank and through which the washing water supplied to the filtration tank flows, and a spray nozzle formed along the circumference of the nozzle body and having a plurality of spray holes for spraying the washing water supplied to the nozzle body. It is preferable to include

It is preferable to further include a driving unit for rotating the nozzle body.

an air nozzle located below the agitating blade and having a through hole; and a compressor for supplying air to the air nozzle, and when cleaning the flotation media, it is preferable to supply air from the compressor to the stirring blades so as to be sprayed through the through hole.

It is preferable to further include a rinse valve for discharging air in the filtration tank, and the rinse valve is opened when air is supplied from the compressor to the air nozzle.

According to the filtering device according to the present invention, the following effects can be obtained.

1) If the amount of floating filter medium in the filter tank is reduced, it can be automatically replenished and filtered.

2) Separation of the flotation media that can be reused from among the flotation media leaked from the filtration tank and automatically replenishing the filtration tank can prevent waste of the flotation media and increase the efficiency of operation of the filtration system.

3) After washing the flotation media, it is possible to minimize the amount of the flotation media flowing out when sewage is discharged.

4) When the turbidity of the influent is high, coagulant is added to reduce the filtration load of the flotation media and extend the life of the flotation media.

5) By spraying the washing water into the filter tank through the spray nozzle, backwashing of the strainer, washing of the floating filter medium and washing of the inner wall of the filtering tank can be performed together.

6) When cleaning the flotation filter medium, it is possible to perform powerful cleaning by supplying fine bubbles and performing agitation, so the regeneration rate of the flotation filter medium is improved, and as described above, viscous substances can be easily desorbed by the coagulant, and flotation It can also solve the entanglement between filter media.

7) It is possible to maintain the pressure in the filtration tank even when cleaning is performed by supplying fine bubbles.

1 is a schematic diagram of a filtering device according to an embodiment of the present invention.
2 is a perspective view of a filtering tank, which is a component of a filtering device according to an embodiment of the present invention.
3 is a schematic diagram of a solid-liquid separator, which is a component of a filtering device according to an embodiment of the present invention.
4 to 8 are schematic diagrams of a filtering device according to an embodiment of the present invention, showing the operation of the filtering device.

The above objects, features and other advantages of the present invention will become more apparent by describing preferred embodiments of the present invention in detail with reference to the accompanying drawings. In this process, the thickness of lines or the size of components shown in the drawings may be exaggerated for clarity and convenience of description. In addition, terms to be described later are terms defined in consideration of functions in the present invention, which may vary according to the intention or custom of a user or operator. Therefore, the definitions of these terms should be described based on the contents throughout this specification.

In addition, the described embodiments are provided by way of example for explanation of the present invention, and do not limit the technical scope of the present invention.

Hereinafter, the configuration of a filtering device according to an embodiment of the present invention will be described in detail with reference to FIGS. 1 to 3 attached.

As shown in FIG. 1, the filtering device according to an embodiment of the present invention includes a filtering tank 100, a spray nozzle 120, a filter medium replenisher 400, a solid-liquid separator 300, and a washing water supply unit 200. ) and a coagulant supply unit 500.

The filtration tank 100 is in the form of a tank having a predetermined space therein, and a plurality of flotation media 10 are accommodated therein.

The filtration tank 100 includes a strainer 110, stirring blades 140, air nozzles 150 and detection sensors 130.

An inflow line L1 is connected to one side of the filtration tank 100, and inflow water flows into the filtration tank 100 through the inflow line L1.

An inflow pump (P1) for inflow of inflow water and an inflow valve (V1) for controlling the inflow of inflow water are installed in the inflow line (L1), and the inflow to measure the pressure and turbidity of the inflow water flowing into the inflow line (L1). A pressure sensor (PS1) and a turbidity sensor (TS) are respectively installed.

Here, 'inflow water' refers to the object to be filtered by this filtration device, and includes sewage, sewage, wastewater, effluent, underground water, industrial water, process water, circulating cooling water, etc., and also livestock manure or manure treatment This includes even the filtrate discharged from the facility. However, it is not limited thereto and may be a fluid requiring filtration.

The inflow water introduced into the filtration tank 100 is filtered by the flotation media 10 within the filtration tank 100, which will be described in detail later.

The inflow water filtered in the filtration tank 100 flows out of the filtration tank 100 through the outlet 101 located at the top of the filtration tank 100 as treated water.

An outflow line L2 is connected to the outlet 101, and the treated water flowing out of the filtration tank 100 flows out to a treated water tank (not shown) through the outflow line L2 and is stored or used.

An outlet pressure sensor PS2 for measuring the pressure of the treated water flowing out of the filtration tank 100 and an outlet valve V2 for controlling the outflow of the treated water are installed in the outlet line L2.

In addition, an air discharge line (L7) is connected to the outlet line (L2). A rinse valve (V6) is installed in the air discharge line (L7).

As shown in FIGS. 1 and 2 , an outlet 101 and a filter medium inlet 102 are disposed above the filtration tank 100 .

As shown in FIG. 2, the strainer 110 is located at the outlet 101 of the filtration tank 100 to prevent the floating filter medium 10 from flowing out through the outlet 101 during filtering of the inflow water.

The strainer 110 may be made of a mesh member or a cylindrical member having a plurality of holes, but is not limited thereto, and may be made of a material or structure that allows the treated water to pass without passing the floating filter medium 10. .

That is, in the case of a mesh member or a member having a plurality of holes, the diameter of the eyes or holes of the mesh member may be smaller than that of the floating filter medium 10.

The treated water passing through the strainer 110 is discharged through the outflow line (L2).

The stirring blades 140 are located inside the filtration tank 100. The stirring blades 140 are shaped like propellers and are rotatably positioned within the filtration tank 100.

An air nozzle 150 installed to be rotatable together with the stirring blades 140 is positioned below the stirring blades 140 .

A plurality of through holes 151 are formed in the air nozzle 150, and an air supply line L3 supplying air to the air nozzle 150 is connected.

Although not shown, a driving unit such as a motor for rotating the stirring blades 140 and the air nozzle 150 may be installed.

An air supply means such as a compressor 122 is provided in the air supply line L3, and as the compressor 122 operates, air is supplied to the air nozzle 150 through the air supply line L3, and the supplied air is injected into the filter tank 100 through the through hole 151.

The washing of the floating filter medium 10 is performed by stirring the washing water and the floating filter medium 10 through the stirring blades 140, which will be described in detail later.

As shown in FIG. 2, the injection nozzle 120 is located above the filtering tank 100. The spray nozzle 120 includes a nozzle body 121, a spray hole 122 and a driving unit 123.

The nozzle body 121 is connected to the washing water supply line L6.

A plurality of injection holes 122 are formed on the circumferential side of the nozzle body 121 .

The driving unit 123 is installed on the nozzle body 121 to rotate the nozzle body 121 . The driving unit 123 may be configured with a device that generates rotational motion, such as a motor.

The washing water flowing into the washing water supply line (L6) is injected into the filter tank 100 through the spray hole 122 formed in the nozzle body 121, and at this time, the nozzle body 121 is operated by operating the driving unit 123. By rotating, the sprayed washing water can be sprayed evenly along the circumferential direction.

As such, backwashing of the strainer 110 of the filtration tank 100 and cleaning of the inner wall of the filtration tank 100 are performed using the washing water supplied to the injection nozzle 120 through the washing water supply line L6.

The detection sensor 130 is installed in the filtration tank 100 and detects the amount of the floating filter medium 10 accommodated inside the filtration tank 100. The detection sensor 130 may be composed of an infrared sensor or the like, but is not limited thereto. does not

In addition, a viewing window 131 is installed on one side wall of the filter tank 100 so that the inside can be seen, so that the amount of the floating filter medium 10 in the filter tank 100 can be visually checked, and the detection sensor 130 ) is installed outside the viewing window 131 and can sense the amount of the floating media 10 projected through the viewing window 131.

The washing water supply unit 200 is connected to the spray nozzle 120 of the filtration tank 100 through the above-described washing water supply line L6, and also connected to the outflow line L2 through the branch line L9. do.

A washing pump P2 and a washing valve V8 are installed in the washing water supply line L6, and a branch valve V3 is installed in the treated water branch line L9.

The treated water discharged from the filtration tank 100 through the outflow line L2 flows into the washing water supply unit 200 through the treated water branch line L9 as the branch valve V3 is opened and can be used as washing water. there is.

Specifically, the treated water introduced into the washing water supply unit 200 and stored is supplied to the spray nozzle 120 as washing water through the washing water supply line L6 by the operation of the washing pump P2.

That is, the washing water supply unit 200 supplies separately supplied washing water to the spray nozzle 120 or supplies treated water treated in the filtration tank 100 to the spray nozzle 120 as washing water.

The solid-liquid separator 300 is connected to the filtration tank 100 through a sewage outflow line L4, and a sewage valve V4 is installed in the sewage outflow line L4.

The sewage outflow line L4 may be connected to the solid-liquid separator 300 from the bottom of the filter tank 100 so that the sewage generated by washing the floating filter medium 10 in the filter tank 100 flows out smoothly. .

Sewage discharged from the filtration tank 100 flows into the solid-liquid separation unit 300 . Here, the sewage is water mixed with impurities and dirt that are separated from the flotation filter medium 10 when the flotation filter medium 10 is washed, and this sewage includes some of the flotation filter medium flowing out with the sewage even though it can be reused.

The solid-liquid separation unit 300 includes a sewage storage tank 310 and a scraper 320.

The sewage storage tank 310 has a space inside, and as described above, the sewage generated when the flotation filter medium 10 is washed in the filter tank 100 flows into the sewage storage tank 310 and is stored therein.

The scraper 320 is positioned to be movable on top of the sewage storage tank 310.

As shown in FIG. 3, when the sewage stored in the sewage storage tank 310 is left for a certain period of time, the specific gravity of the flotation media 10 included in the sewage is recovered by washing, and the reusable flotation media floats to the surface of the water, Dirt or impurities settle in the form of sludge, and at this time, the non-reusable flotation media settles together with the soil.

The scraper 320 separates the reusable flotation media from the sewage by scraping off the flotation media floating on the top of the sewage reservoir 310.

The filter medium replenishment unit 400 is connected to the solid-liquid separator 300 and the filter tank 100 through a filter medium inlet line L5 and a filter medium supply line L8, respectively.

A filter medium valve V5 for controlling the amount of filter medium supplied to the filter medium supply line L8 is installed.

The floating filter medium 10 separated in the solid-liquid separation unit 300 is introduced into the filter medium supplementary unit 400 through the filter medium inlet line L5 connecting the solid-liquid separator 300 and the filter medium supplementary unit 400 and stored therein. . In addition, a new floating filter medium 10 from the outside may be additionally stored in the filter medium replenishment unit 400 .

The floating filter medium 10 stored in the filter medium replenishment unit 400 is supplied to the inside of the filter tank 100 through the filter medium supply line L8 and the inlet 102 of the filter tank 100, and the filter medium supplement unit 400 The amount of the floating filter medium 10 supplied to the filtration tank 100 from the filter medium is controlled through the filter medium valve V5.

In addition, the filtering device may further include a coagulant supply unit 500 .

The coagulant supply unit 500 supplies the coagulant into the filtration tank 100 through the coagulant supply line L10 connected to the inlet line L1, and the coagulant supply line L10 has a coagulant valve V7 installed.

And, although not shown, connected to each of the above-described sensors (PS1, PS2, TS, 130), pumps (P1, P2), each valve (V1 to V7), compressor 122, drive unit 123 and motor A control unit may be installed.

As will be described later, information measured by each sensor (PS1, PS2, TS, 130) is input to the control unit, and the control unit controls each of the valves (V1 to V7), each pump (P1, P2), the compressor 122, Controls the operation of the driving unit 123 and the motor

Next, with further reference to the attached FIGS. 4 to 9, the operation of the filtering device according to an embodiment of the present invention will be described.

As shown in FIG. 4, the floating filter media 10 is accommodated in the filter tank 100, and the inflow water flows into the filter tank 100 through the inlet line L1 by the operation of the inlet pump P1.

At this time, the pressure and turbidity of the inflow water flowing into the filtration tank 100 are respectively measured by the inlet pressure sensor PS1 and the turbidity sensor TS installed in the inlet line L1.

When the turbidity of the inflow water measured by the turbidity sensor (TS) exceeds the preset turbidity, the control unit opens the coagulant valve (V5) to filter the filter tank (100) from the coagulant supply unit (500) through the coagulant supply line (L10). so that the coagulant is supplied.

Thus, the load of the floating filter medium 10 can be reduced in advance when filtering the floating filter medium 10 .

Next, the inflow water introduced into the filtration tank 100 is filtered.

As shown in FIG. 5, as the inflow water flowing into the filtration tank 100 fills the inside of the filtration tank 100, the floating filter medium 10 floats and forms a layer at the upper strainer 110 side of the filtration tank 100 achieve and position

The inflow water is filtered while passing through the layer of the flotation filter medium 10 by the pressure of the inflow water flowing from the bottom of the filtration tank 100.

The inflow water filtered while passing through the layer of the flotation filter medium 10 passes through the strainer 110 and flows out of the filter tank 100 through the outflow line L2.

At this time, the pressure of the treated water flowing out through the outflow line (L2) is measured by the outflow pressure sensor (PS2) installed in the outflow line (L2).

The outflowing treated water flows into a treated water tank (not shown) connected to the outflow line L2 and is stored, or, by opening the branch valve V3, the treated water passes through the treated water branch line L9 to the washing water supply unit 200. ) and is stored.

As described above, during the filtration operation of the influent, the control unit, when the difference between the pressure of the inlet water measured by the inlet pressure sensor PS1 and the pressure of the treated water measured by the outlet pressure sensor PS2 exceeds a preset pressure, the next As described above, the washing of the floating filter medium 10 and the back washing of the strainer 110 are performed.

The reason why the difference between the pressure of the inflow water and the pressure of the treated water is increased is because the filtration efficiency of the flotation filter medium 10 is lowered, and thus the flotation filter medium 10 and the strainer 110 through which the inflow water is filtered must be cleaned.

The control unit stops the operation of the inlet pump (P1), closes the inlet valve (V1) to block the inflow water from flowing into the filtration tank (100), and also closes the outlet valve (V2) to prevent the inflow water from the inlet tank (100). Block the outflow of treated water.

After that, as shown in FIG. 6, the control unit rotates a motor (not shown) connected to the stirring blades 140 and the air nozzle 150 to remove the inflow water and the floating filter medium 10 inside the filtering tank 100. While stirring, the compressor 122 is operated so that fine bubbles are supplied through the through hole 151 of the air nozzle 150.

As a result, the layer of the flotation filter medium 10 is dismantled and the dirt collected in the flotation filter medium 10 is desorbed while being stirred with the washing water to perform cleaning.

In this way, since powerful cleaning is possible by performing the stirring operation through the stirring blades 140 and supplying fine bubbles to the air supply unit 150 to clean the floating filter medium 10, the regeneration rate of the floating filter medium 10 is improved. As described above, the separation of the viscous material by the coagulant is easy, and also the entanglement between the flotation media 10 can be eliminated.

However, as described above, when stirring is performed while supplying microbubbles, the pressure inside the filtration tank 100 is increased by the supplied air. Therefore, the controller maintains the pressure inside the filtration tank 100 by opening the rinse valve V6 installed in the air discharge line L7 during stirring to discharge air from the filtration tank 100.

As shown in FIG. 7, after washing the floating filter medium 10, the control unit ends the operation of the stirring blades 140, the air nozzle 150 and the compressor 122, and then the control unit closes the sewage valve V4. is opened so that the cleaned sewage in the filtration tank 100 flows out to the solid-liquid separator 300 through the sewage outflow line L4, and at this time, the flotation media damaged to the extent that it cannot be reused is not properly floated. Therefore, it flows out to the solid-liquid separator 300 together with sewage.

However, when the level of the sewage is lowered as the sewage flows out, and the layer of the flotation filter medium 10 approaches the lower part of the filter tank 100, the reusable flotation filter medium 10 may also flow out through the sewage outflow line L4 and be lost. there is.

At this time, as shown in FIG. 8, when wastewater flows from the filtration tank 100 to the solid-liquid separator 300, the control unit operates the washing pump P2 to additionally supply washing water to the filtration tank 100. Let it be.

As a result, the water level in the filter tank 100 is raised so that the reusable floating filter medium 10 is kept separated from the lower part of the filter tank 100 and the sewage is drained, thereby minimizing the loss of the reusable floating filter medium 10. suppress with

However, even the reusable flotation media 10 may flow out in small amounts and be lost due to outflow of sewage and non-reusable flotation media.

As shown in FIG. 3, the wastewater introduced into the wastewater storage tank 310 of the solid-liquid separation unit 300 is specific gravity by washing among the flotation media included in the wastewater stored in the wastewater storage tank 310 after a predetermined stagnation time has elapsed. The recovered and reusable flotation media 10 floats to the surface of the sewage, and the flotation media, which cannot be reused and dirt or debris, settles to the bottom of the sewage reservoir 310 together with the soil.

The control unit operates the scraper 320 of the solid-liquid separator 300 to scrape and remove the flotation filter medium 10 floated on the top of the sewage storage tank 310 so that it flows out.

The floating filter medium 10 discharged from the solid-liquid separator 300 is introduced into the filter medium replenishing unit 400 and stored therein.

The floating filter medium 10 stored in the filter medium replenishment unit 400 is supplied back to the filter tank 100 so that it can be reused.

Thereafter, the control unit operates the washing pump P2 and opens the washing valve V8 so that the washing water from the washing water supply unit 200 is supplied into the filter tank 100 through the outflow line L2.

As described above, the washing water supplied to the filtration tank 100 can be reused by storing already filtered treated water in the washing water supply unit 200 or separately supplying the washing water stored in the washing water supply unit 200 in advance. can be used

As shown in FIG. 9 , the washing water supplied to the filtration tank 100 through the washing water supply line L6 is sprayed by the spray nozzle 120 .

As the washing water sprayed by the spray nozzle 120 passes through the strainer 110 , contaminants attached to the mesh net or holes of the strainer 110 are backwashed.

At this time, the control unit operates the driving unit 123 to rotate the nozzle body 121 so that the strainer 110 is effectively cleaned.

In addition, when the strainer 110 is removed after the backwashing of the strainer 110 is performed to some extent, the washing water sprayed from the spray nozzle 120 is directly sprayed to the inner wall of the filter tank 100, thereby cleaning the inner wall of the filter tank 100 can also be done

When the cleaning is completed, the control unit operates the inlet pump P1, opens the inlet valve V1 and the outlet valve V2, and closes the rinse valve V6, so as shown in FIG. Allow filtration to take place.

At this time, the control unit, when the amount of the floating filter medium 10 in the filter tank 100 detected by the sensor 130 is less than a predetermined amount, the floating filter medium 10 from the filter medium replenishing unit 400 to the filter tank 100 ) is additionally supplied to replenish the floating filter medium 10, whereby the floating filter medium 10 separated from the solid-liquid separation unit 300 and stored in the filter medium replenishment unit 400 as described above is returned to the filter tank 100. It can be reused by being supplied.

According to the filtering device according to the present invention, the following effects can be obtained.

1) If the amount of floating filter medium in the filter tank is reduced, it can be automatically replenished and filtered.

2) Separation of the flotation media that can be reused from among the flotation media leaked from the filtration tank and automatically replenishing the filtration tank can prevent waste of the flotation media and increase the efficiency of operation of the filtration system.

3) After washing the flotation media, it is possible to minimize the amount of the flotation media flowing out when sewage is discharged.

4) When the turbidity of the influent is high, coagulant is added to reduce the filtration load of the flotation media and extend the life of the flotation media.

5) By spraying the washing water into the filter tank through the spray nozzle, backwashing of the strainer, washing of the floating filter medium and washing of the inner wall of the filtering tank can be performed together.

6) When cleaning the flotation filter medium, it is possible to perform powerful cleaning by supplying fine bubbles and performing agitation, so the regeneration rate of the flotation filter medium is improved, and as described above, viscous substances can be easily desorbed by the coagulant, and flotation It can also solve the entanglement between filter media.

7) It is possible to maintain the pressure in the filtration tank even when cleaning is performed by supplying fine bubbles.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited to the specific embodiments described above. That is, those skilled in the art to which the present invention pertains can make many changes and modifications to the present invention without departing from the spirit and scope of the appended claims, and all such appropriate changes and modifications Equivalents should also be considered as falling within the scope of this invention.

100: filter tank
200: washing water supply unit
300: solid-liquid separation unit
400: Filter medium supplementation unit
500: coagulant supply unit

Claims (9)

A filtration tank 100 in which the flotation filter medium 10 is accommodated, and the inflow water flowing into one side and the treated water filtered by the flotation filter medium 10 flows upward;
a strainer 110 positioned above the filtration tank 100 and configured to pass the treated water and not pass the floating filter medium 10;
Stirring blades 140 located inside the filtration tank 100;
A sensor 130 for detecting the amount of the floating filter medium 10 inside the filter tank 100; and
A filter medium replenishment unit 400 for supplying the floating filter medium 10 to the filter tank 100;
When the amount of the floating filter medium 10 detected by the detection sensor 130 is less than a predetermined amount, additionally supplying the floating filter medium 10 from the filter medium replenisher 400 to the filter tank 100 ,
Device.
According to claim 1,
a solid-liquid separator 300 into which sewage discharged from the filtration tank 100 is introduced and which separates reusable flotation media from the flotation media 10 included in the waste water; and
Further comprising a washing water supply unit 200 supplying the washing water to the filtration tank 100,
The floating filter medium 10 separated in the solid-liquid separator 300 is supplied to the filter medium replenishing unit 400,
Device.
According to claim 2,
The solid-liquid separation unit 300,
Including a sewage storage tank 310 in which sewage flowing from the filter tank 100 is stored, and a scraper 320 located above the sewage storage tank 310,
Device.
According to claim 1,
When sewage is discharged from the filtration tank 100 to the solid-liquid separator 300, washing water is additionally supplied to the filtration tank 100,
Device.
According to claim 1,
a turbidity sensor (TS) for measuring the turbidity of the inflow water flowing into the filtration tank (100); and
Further comprising a coagulant supply unit 500 for supplying the coagulant to the filtration tank 100,
When the turbidity of the influent measured by the turbidity sensor TS exceeds the preset turbidity, the coagulant is supplied from the coagulant supply unit 500 to the filter tank 100,
Device.
According to claim 1,
A nozzle body 121 located above the filtration tank 100 and into which the washing water supplied to the filtration tank 100 flows and formed along the circumference of the nozzle body 121 to be supplied to the nozzle body 121 Further comprising a spray nozzle 120 provided with a plurality of spray holes 122 for spraying the washing water,
Device.
According to claim 6,
Further comprising a drive unit 123 for rotating the nozzle body 121,
Device.
According to claim 1,
An air nozzle 150 located under the agitating blade 140 and having a through hole 151 formed therein; and
Further comprising a compressor 122 for supplying air to the air nozzle 150,
When cleaning the floating filter medium 10, air is supplied from the compressor 122 to the stirring blades 140 to be sprayed through the through hole 151,
Device.
According to claim 8,
Further comprising a rinse valve (V6) for discharging air in the filtration tank (100),
The rinse valve V6 is opened when air is supplied from the compressor 122 to the air nozzle 150.
Device.

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