KR100525760B1 - Apparatus for filtering sludge from water for purification - Google Patents

Abstract

The present invention provides a pump for sucking sludge together with water from a subwater body; A filter case provided with a filtration layer for filtering the water and the sludge sucked by the pump, the filter case having a sludge outlet formed at the bottom thereof; A discharge pipe for supplying the water and the sludge sucked by the pump to a lower portion of the filtration layer inside the filter case; And discharge means rotatably coupled to an end of the discharge pipe to spray water and sludge supplied through the discharge pipe toward the filter layer, wherein the water from which the sludge is filtered by the filter layer is filtered. Disclosed is a water filtration device that flows back to the upper water body located above.

Description

Rotary upflow water filtering device {Apparatus for filtering sludge from water for purification}

The present invention relates to a rotary upflow water filtration device, and more particularly, to a rotary upflow water filtration device capable of effectively removing sediment sludge, sedimentation sludge, and the like existing in a water body of a closed water body such as a pond.

In general, closed water bodies, such as natural or artificially-dried reservoirs or ponds, are mostly lacking or almost no influent. In such closed water bodies, water quality is severely contaminated if the rate of increase of naturally occurring and unspecified contaminants from outside exceeds the natural self-cleaning capacity, causing sedimentary sludge or sludge to be deposited on the bottom of the pond. .

The accumulated contaminants decay over time or rise above the water, causing odors, polluting water quality, and at the same time being a major cause of damage to the landscape. Therefore, the necessity of continuously removing such settling sludge or sedimentary sludge is absolutely required.

Conventionally, the general method for removing the sediment sludge or sedimentation sludge as described above was a method of draining all the water in the water body and dredging or discharging it using suction equipment. However, this method requires enormous manpower, time, and cost, and furthermore, as the pollutant increases again over time, it is inconvenient to repeat the pollutant removal operation periodically.

As another method of the related art, there is an attempt to inject a chemical into water or inject air to float a precipitate to remove it. However, when the body of water is very large, the removal efficiency is very low, it is very uneconomical to add the medicine and air injector and the removal of the injuries.

In view of the above, a system for constantly filtering sludge in order to purify the water quality of the closed water is proposed. According to this system, a plurality of inlets are formed at the bottom of the pond and the closed water, and the sludge is sucked through these inlets and then introduced into a separate purified water body through the underground pipeline. Water introduced into the purified water is filtered through contaminants such as sludge while passing through the bottom filtration layer, and the purified water is again supplied to the original water along a separate pipeline.

However, such a system employs a so-called 'top-down' filtration method in which contaminated water seeps into the bottom layer, so that filtered contaminants or sludge will be deposited on the bottom sand layer. Therefore, the bottom of the purified water is severely polluted, causing odor or inhibiting the hydraulic tube. Furthermore, in order to periodically remove the sediment contaminants, when the water flows in the reverse direction to backwash the filtration layer, the sediment contaminants or sludge floats on the surface of the pond, increasing the pollution of the purified water, and further, In order to send and remove a large amount of water must be flowed, so the removal efficiency is not only low but also very economical.

Therefore, there is an urgent need for means that can effectively filter and purify the water quality without contaminating the water quality of the purified water.

The present invention was devised in view of the above problems, and by adopting a rotary upflow filtration method, it is possible to provide a water filtration device that can effectively remove sludge or contaminants contained in water without contaminating the water quality of the purified water. The purpose is.

In order to achieve the above object, the water filtration apparatus according to the present invention includes a pump for sucking sludge together with water from a lower body of water; A filter case provided with a filtration layer for filtering the water and the sludge sucked by the pump, the filter case having a sludge outlet formed at the bottom thereof; A discharge pipe for supplying the water and the sludge sucked by the pump to a lower portion of the filtration layer inside the filter case; And discharge means rotatably coupled to an end of the discharge pipe and spraying water and sludge supplied through the discharge pipe toward the filter layer, wherein the sludge is filtered upward. Water is supplied to the upper body of water.

Preferably, the discharge means, the one end is coupled to communicate with the discharge pipe and at the same time rotatable around the coupling portion, and comprises a plurality of discharge pipes formed with a plurality of discharge ports for injecting the water and sludge do.

At this time, the discharge port is all formed in one direction to the side of the discharge pipe. More preferably, the discharge port is formed obliquely upwardly inclined toward the filtration layer.

The present invention also includes: a coupling member coupled to an end of the discharge pipe and rotatably coupled to the discharge pipe so that the discharge pipe communicates with the discharge pipe; And rotation connection means interposed between the coupling member and the discharge pipe to be rotatable with each other.

Preferably, a strainer is provided in the filter case, and the filtration layer is positioned above the strainer.

In addition, the filter case of the present invention is composed of a cylindrical body portion and a hopper-shaped precipitation portion extending below. At least one perforated plate having a plurality of through holes may be further provided at the precipitation part of the filtering case.

According to another aspect of the invention, the first pump for sucking the sludge with water from the lower body of water; A housing having a filtration layer for filtering the water and the sludge sucked by the first pump, a sludge discharge port is formed at the bottom thereof, and a supply pipe at which the sludge is filtered water is discharged; A discharge pipe for supplying the water and the sludge sucked by the first pump to a lower portion of the filtration layer inside the housing; Discharge means rotatably coupled to an end of the discharge pipe to spray water and sludge supplied through the discharge pipe toward the filter layer; It is provided with a water quality filtering device comprising a; and the supply pipe for discharging the sludge filtered water back to the filter layer to the upper water.

Preferably, the present invention further includes a backwashing means installed on the filtration layer inside the housing to flow water back from the upper body to the housing.

The backwashing means may include a backwashing pipe extending from the upper water body to an upper portion of the filtration layer inside the housing; A second pump installed in the backwash pipe and providing a driving force to reverse flow of water; And a plurality of backwashing pipes, one end of which is coupled to be in communication with an end portion of the backwashing pipe in the housing and rotatably around the coupling portion, the plurality of backwashing pipes formed with a plurality of backwashing holes through which the countercurrent water is injected. .

The back pores are all formed in one direction on the side of the back washing tube.

Preferably, the present invention is an auxiliary pipe connected to the backwash pipe; And a compressor for injecting compressed air into the housing through the auxiliary pipe so that the sludge detained by the filtration layer is discharged through the sludge outlet.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms or words used in the specification and claims should not be construed as having a conventional or dictionary meaning, and the inventors should properly explain the concept of terms in order to best explain their own invention. Based on the principle that can be defined, it should be interpreted as meaning and concept corresponding to the technical idea of the present invention. Therefore, the embodiments described in the specification and the drawings shown in the drawings are only the most preferred embodiment of the present invention and do not represent all of the technical idea of the present invention, various modifications that can be replaced at the time of the present application It should be understood that there may be equivalents and variations.

1 shows a schematic configuration of a water purification system employing a water filtration device according to a preferred embodiment of the present invention.

Referring to the drawings, the water filtration apparatus of the present invention may be installed in a pond, for example, a closed water body. The pond may be divided into a lower body of water (100) that accommodates most water and has a relatively low water surface, and an upper body of water or a purified water body (200) of a portion of which the surface of water is relatively higher than the lower body of water (100). have. The purified water 200 is an area where the contaminated water is discharged after being filtered and purified. These purified water bodies 200 and lower water bodies 100 are connected by step water bodies 300 therebetween, and water flows from the purified water bodies 200 to the lower water bodies 100.

The water purification system according to the present invention includes a plurality of sludge suction means 10 installed in the lower water body 100.

The sludge suction means 10 is to suck the sludge precipitated at the bottom of the pond with water, they can be installed in a plurality of spaced apart from each other, the interval and number is appropriately according to the pollution degree and the midnight ability of the water Is set.

The sludge suction means 10 is connected to the pump 40 by the suction pipe 30, the pump 40 sucks water and sludge, and provides a driving force to filter the sludge as described below. do.

Water and the sludge mixture introduced into the inlet 41 of the pump 40 along the suction pipe 30 to the sludge filtration means 20 along the discharge pipe 50 connected to the outlet 42 of the pump 40. Flow.

Referring to FIG. 2 in which the configuration of the sludge filtration means 20 according to the present invention is shown in more detail, the sludge filtration means includes a filtration case composed of a cylindrical body portion 21a and a hopper type precipitation portion 21b. And a discharge means provided in the filter case 21.

The filtration layer 22 is provided in the body portion 21a of the filtration case 21 to filter contaminated water. The filter layer 22 may employ conventional media materials such as gravel, sand, activated carbon, and the like. Preferably, the body portion 21a is provided with a strainer 23, a material having a large particle such as, for example, gravel is first stacked on the strainer 23, and a fine particle layer such as sand may be stacked thereon. have.

The discharge pipe 50 connected to the pump 40 extends to the lower portion of the filtration layer 22 inside the filter case 21, preferably to the center of the lower portion of the strainer 23, and the extended discharge pipe 50. Discharge means is provided on the end of the).

The discharge means includes a plurality of discharge pipes 24 rotatably supported at the end of the discharge pipe 50. Referring to FIG. 3, which shows the configuration of the discharge pipe 24, the discharge pipes 24 are rotated about the coupling portion with the discharge pipe 50 while one end thereof communicates with the discharge pipe 50. To be connected.

In addition, a plurality of discharge ports 24a are formed in the discharge tube 24, and the discharge holes 24a are formed in one direction (counterclockwise in this embodiment) on the side of the discharge tube 24. This is to cause the discharge tube 24 to rotate due to its reaction when discharging water and sludge through the discharge port 24a as described later.

According to a preferred embodiment of the present invention, the discharge port 24a may be formed to be inclined upwardly obliquely toward the strainer 23 in the circumferential direction of the discharge tube 24, preferably at an angle of 45 °. have. At this time, the formation angle of the discharge port may be appropriately set in consideration of the efficiency within the range in which the discharge tube 24 can rotate by the discharge reaction. In addition, the discharge port 24a may be formed as a conventional through hole or may be configured in the form of a nozzle.

In addition, one end of the discharge pipe 24 is coupled to communicate with the discharge pipe 50 connected to the pump (40 in Figure 1), wherein the discharge pipe 24 is the center of the coupling portion with the discharge pipe 50 It is coupled to be rotatable. That is, as shown in Figure 4, the discharge pipe 24 may be coupled to the discharge pipe 50 through the rotation connecting means (26). The discharge tube 24 may be integrally formed or integrated through the coupling member 25, in which case the coupling member 25 may be rotatably coupled to the discharge pipe 50.

The rotary connecting means 26 is a bush 26a coupled to communicate with each other at the end of the discharge pipe 50, and rotatably coupled to the bush 26a, and the discharge pipe 24 or the coupling member 25 Rotation tube (26b) coupled to communicate with the end of the).

A bracket 26c is formed at the end of the rotary tube 26b, which is coupled to the bracket 25a formed at the end of the coupling member 25 by a fastening member such as a bolt 28a. In addition, a bracket 26d is formed at the end of the bush 26a, which may be coupled to the bracket 50a formed at the end of the discharge pipe 50 by the bolt 28b.

Between the bush 26a and the rotary tube 26b, for example, a bearing 26e such as a sliding bearing is interposed therebetween so as to be capable of mutual rotation. Preferably, in order to support the weight of the rotary tube 26b, a separate bearing 26f is interposed at the lower end thereof to smoothly support the rotation.

More preferably, the rotation connecting means may be assembled and disassembled with respect to the discharge pipe and the discharge pipe as one component, and thus may be configured to be easily replaced as the bearing is damaged or the service life is elapsed.

Although the coupling between the discharge pipe 24 and the discharge pipe 50 in the present embodiment has been described in detail, it should be understood that the present invention is not limited by this embodiment, and the discharge pipe is connected to the discharge pipe. Any configuration conventionally applicable is applicable as long as it can be rotatably coupled.

The settling portion 21b of the filter case 21 is a place where the separated and filtered sludge is concentrated and settled, and a sludge discharge port 21c is formed at the bottom thereof, which is formed by the sludge discharge pipe 60 of the pump 40. It is connected to the inlet (41).

In addition, at least one perforated plate 70 having a plurality of through holes 71 formed in the settling portion 21b of the filter case 21 may be installed by the bracket 72, which will be described later. This is to prevent the vortex of the fluid at the time to ensure a stable and uniform flow.

The water filtration device of the present invention can be installed and used directly below the purified water 200 as shown in FIG. In this case, various aquatic plants in the purified water 200 may be formed on the filtration layer 22 to maintain a natural landscape.

Reference numerals 75, 76, 77, and 78 which are not described in FIG. 1 indicate valves, respectively. Although the pipes between the suction means 10 and the pump 40 and the sludge filtration means 20 have been described in detail in the present specification and drawings, the pipes between them may be modified within the scope of the technical idea of the present invention. Can be. For example, in the present embodiment, only one pump is used, but a plurality of pumps may be employed to be distinguished for each use.

Then, the operation of the water purification system employing the water filtration device according to a preferred embodiment of the present invention having the above configuration will be described.

In the operation of the water purification system of the present invention, first, the pump 40 is driven to suck the sludge together with the water in the lower body 100 through the suction means 10 and the suction pipe 30. At this time, the valves 75 and 77 are in an open state, and the valves 76 and 78 are in a closed state.

The sludge mixed water introduced into the inlet 41 of the pump 40 through the suction pipe 30 comes out of the outlet 42 of the pump 40 and the filtering case of the sludge filtering means 20 through the discharge pipe 50. It flows into the precipitation part 21b of (21).

Then, the sludge mixed water flows into the discharge pipe 24 connected to the discharge pipe 50 end and is injected through the discharge port 24a. At this time, the discharge port 24a is inclined upward obliquely toward the strainer 23, so that the sludge mixed water injected therefrom hits the strainer 23. In addition, as shown in FIG. 3, since the discharge port 24a is formed at one side (for example, a counterclockwise direction) on the side of the discharge tube 24, in response to the injection pressure of the sludge mixed water. The discharge tube 24 is rotated, for example, clockwise.

The operation as described above brings the characteristic effects of the present invention. First, the sludge mixed water is sprayed at an angle to the strainer 23 to act to desorb pollutants deposited or adsorbed on the strainer 23. do. Secondly, as the discharge tube 24 rotates, the sludge and water near the strainer 23 are stirred to further promote separation and filtration of the sludge.

Subsequently, the injected sludge mixed water flows upward through the filter layer 22 by pressure, in which sludge or contaminants are filtered out by the filter layer 22.

As a result, clean water from which the sludge is separated and filtered is discharged to the purified water 200, and then flows along the step water 300 to the lower water 100. Although the water quality filtration device of the present invention is shown as being buried just below the purified water body 200 in this embodiment, as another alternative, the water separated and filtered by the water filtration device is passed through a separate passage. May flow to 200.

By repeating this process, the separated sludge is deposited on the bottom of the settling portion 21b in the filter case 21. If the sludge is deposited to some extent, it is removed by removing it out of the filter case 21, the process for this is as follows.

In the sludge discharge removal operation, the valves 75 and 77 are closed, the valves 76 and 78 are opened, and the pump 40 is driven. Then, the sludge accumulated at the bottom of the settling tank 21b through the sludge discharge pipe 60 is discharged together with the water. At this time, the filtration layer 22 is also subjected to back pressure, so that the water flows downward, and in this process, sludge or contaminants attached to the filtration layer 22 and the strainer 23 are desorbed downward and the sludge together with the water. Exit to the discharge pipe (60). When the sludge is discharged, the perforated plate 70 serves to keep the flow uniform so that the fluid does not cause vortex.

Subsequently, the sludge discharged through the sludge discharge pipe 60 is discharged to the outside through the drain pipe 90.

The sludge discharge process does not have any effect on the purified water, and since the water flows downward due to the back pressure during the discharge of the sludge, there is no problem of contaminating water quality or floating of contaminants.

A water filtration device 120 according to another preferred embodiment of the present invention is shown in FIG. 5. The water filtration device 120 of the present embodiment may be independently installed in a separate place such as a machine room without being buried underground.

Referring to the drawings, the water filtration apparatus 120 according to the present embodiment has a sealed housing 121, a filtration layer 122 installed inside the housing 121, and a lower portion of the water filtration device 120. A discharging means provided and a backwashing means provided thereon.

As described above, the filtration layer 122 may employ conventional media materials such as conventional gravel, sand, activated carbon, and the like. Preferably, strainers 123a and 123b spaced apart from each other in the housing 121 may be installed, and a filtration layer 122 may be interposed between the strainers 123a and 123b.

 A suction pump 140 is connected to suck the contaminated sludge mixed water through the suction pipe 30, and the discharge pipe 150 is connected to the inside of the housing 121 from the suction pump 140, preferably a lower strainer. 123a extends to the center of the lower portion, and a discharge means is installed on an end of the extended discharge pipe 150.

The discharge means includes a plurality of discharge pipes 124 rotatably supported at an end of the discharge pipe 150 with the discharge port 124a formed, and the configuration and coupling relationship of the discharge means are the same as described above. Therefore, detailed description thereof will be omitted.

The sludge separated and filtered is concentrated at the bottom of the housing 121, and the concentrated sludge is discharged to the outside through the sludge discharge pipe 160 connected to the sludge outlet 121c formed at the bottom.

In addition, the upper end of the housing 121 is connected to the supply pipe 141 so that the sludge is separated and filtered water, the supply pipe 141 is connected to the purified water or the upper body (200 of FIG. 1).

According to this embodiment, the back washing means for discharging the sludge is installed on the upper portion of the upper strainer (123b) in the housing 121. The backwashing means is installed in the backwashing pipe 142 and the backwashing pipe 142 extending from the upper body 200 to an upper portion of the filtration layer 122 in the housing 121, and the upper body of water 200 from the upper body of water 200. It includes a backwash pump 240 for flowing water back toward the housing 121.

In addition, a plurality of backwashing pipes 224 having a backwashing hole 224a is rotatably coupled to an end portion of the backwashing pipe 142 in the housing 121. That is, as shown in Figure 6, the back washing pipe 224 may be coupled to the back washing pipe 142 through the rotation connecting means 226. The backwashing tube 224 may be integrally formed with each other or may be integrated through the coupling member 225, and in this case, the coupling member 225 may be rotatably coupled to the backwashing tube 142.

The rotary connecting means 226 is a bush 226a coupled to communicate with each other at the end of the backwash pipe 142 and rotatably coupled to the bush 226a and the backwashing pipe 224 or the coupling member 225. Rotation tube (226b) is coupled to communicate with the end of the).

A bracket 226c is formed at the end of the rotating tube 226b, and is coupled to the bracket 225a formed at the end of the coupling member 225 by a fastening member such as a bolt 228a. In addition, a bracket 226d is formed at the end of the bush 226a, which may be coupled to the bracket 142a formed at the end of the backwash pipe 142 by a bolt 228b.

Between the bush 226a and the rotary tube 226b, for example, a bearing 226e such as a sliding bearing is interposed therebetween so as to be rotatable with each other. Preferably, in order to support the weight of the rotating tube 226b, a separate bearing 226g is interposed on the flange 226f formed at the lower end of the bush 226a to smoothly support the rotation.

More preferably, the rotatable connecting means may be assembled and disassembled with respect to the back washing pipe and the back washing pipe as one component, and thus may be configured to be easily replaced according to the damage of the bearing or the service life.

Although the coupling between the backwashing pipe and the backwashing pipe in this embodiment has been described in detail, it should be understood that the present invention is not limited by this embodiment, and the backwashing pipe may be rotatably coupled to the backwashing pipe. Any conventional configuration can be applied as long as it is present. In addition, in the present embodiment, the supply pipe and the backwash pipe are separately shown, but these functions may be integrated into one and be performed by a single pipe.

According to this embodiment, the auxiliary back pipe 142 is connected to the auxiliary pipe 143, which extends to the compressor 340. Reference numerals 175, 176, 177, and 178, which are not described in FIG. 5, indicate valves, respectively.

 Then, the operation of the water purification system employing the water filtration device according to a preferred embodiment of the present invention having the above configuration will be described.

In the operation of the water purification system of the present invention, when the suction pump 140 is first driven, the sludge is sucked together with the water through the suction pipe 30. At this time, the valves 175, 176 and 177 are in a closed state.

The sludge mixed water introduced through the suction pipe 30 is introduced into the housing 121 of the water filtration device 120 through the discharge pipe 150.

Then, the sludge mixed water flows into the discharge pipe 124 connected to the discharge pipe 150 and is injected through the discharge port 124a. At this time, since the discharge port 124a is inclined obliquely upward toward the lower strainer 123a, the sludge mixed water injected therefrom hits the strainer 123a. In addition, the discharge tube 124 is rotated, for example, in a counterclockwise direction (since it is similar to FIG. 3). Rotation of the discharge tube 124 prevents the filter layer from being blocked by contaminants with sludge concentration.

Subsequently, the injected sludge mixed water flows upward through the filter layer 122 by the pressure in the housing 121, in which sludge or contaminants are filtered out of the filter layer 122.

Then, the water passing through the filtration layer 122 is discharged to the purified water 200 through the supply pipe 141, and then flows to the lower water 100 along the step water 300.

On the other hand, in the sludge discharge removal operation, after closing the valve 178, opening the valves 175, 176, and 177, the backwash pump 240 is operated. Then, the water in the upper body 200 is flowed back into the housing 121 along the back washing pipe 142 and is ejected through the back washing 224a of the back washing pipe 224.

At this time, since water is injected at a strong pressure through the backwashing holes 224a, the backwashing pipe 224 rotates in a counterclockwise direction, for example, in response to the spraying force. The rotation of the back washing tube 224 allows an even back pressure to be applied to the inside of the upper region of the housing 121 so that sludge adsorbed and detained in the filtration layer 122 can be efficiently removed.

More preferably, the compressor 340 is operated together with the operation of the backwash pump 240 to blow compressed air into the housing 121 through the auxiliary pipe 143. Then, water and compressed air flow downwards while the back pressure is further increased in the housing 121, and sludge or contaminants adsorbed and detained by the filtration layer 122 and the strainer 123a are moved downward in the process. As it is desorbed, it is discharged to the sludge discharge pipe 160 together with the water.

According to the water filtration apparatus of the present invention and the water purification system employing the same, since water and sludge are separated by the rotary upflow filtration method, it is possible to prevent the water quality of the purified water from being contaminated or inhibiting the hydraulic tube.

In addition, since the water and the sludge is filtered while the discharge member is stirred, it is possible to promote the separation of the sludge and prevent deterioration of the function of the apparatus due to the adsorption of contaminants.

In addition, since the discharge member is rotated as a result of the reaction by the earth output without a separate drive source, there is no need to install additional drive means such as a motor, and thus the structure is simple and the installation and manufacturing cost is also economical.

The water filtration device of the present invention is installed to be concealed under the purified water or the purified water so that it does not harm the hydraulic pipe at all, thereby enabling the implementation of an environmentally friendly system.

1 is a longitudinal sectional view schematically showing the configuration of a water purification system employing a water filtration device according to a preferred embodiment of the present invention.

Figure 2 is a schematic cross-sectional view showing the configuration of the sludge filtration means of the water filtration apparatus according to a preferred embodiment of the present invention.

Figure 3 is a plan view schematically showing the configuration of the discharge means employed in the sludge filtration means according to a preferred embodiment of the present invention.

Figure 4 is a schematic cross-sectional view showing the coupling portion of the sludge filtration means according to an embodiment of the present invention.

5 is a cross-sectional view schematically showing the configuration of a water filtration device according to another preferred embodiment of the present invention.

Figure 6 is a schematic cross-sectional view showing the coupling portion of the backwashing means of the water filtration apparatus according to another preferred embodiment of the present invention.

Claims (18)

A pump for sucking sludge together with water from the subwater body; A filter case provided with a filtration layer for filtering the water and the sludge sucked by the pump, the filter case having a sludge outlet formed at the bottom thereof; A discharge pipe for supplying the water and the sludge sucked by the pump to a lower portion of the filtration layer inside the filter case; And A discharge means rotatably coupled to an end of the discharge pipe, the discharge means being formed to be inclined in one direction toward the filter layer, and rotating by reaction by spraying water and sludge through the discharge hole; and , Water filtering device, characterized in that the sludge is filtered water is fed back to the upper layer to the upper water. The method of claim 1, The discharge means, One end of which is coupled to communicate with the discharge pipe and is rotatably installed around the coupling part, the water quality filtering device comprising a plurality of discharge pipes formed with a plurality of discharge ports for jetting the water and sludge . delete delete The method of claim 2, A coupling member coupled to an end of the discharge pipe and rotatably coupled to the discharge pipe so that the discharge pipe communicates with the discharge pipe; And And a rotation connection means interposed between the coupling member and the discharge pipe so as to be rotatably coupled to each other. The method of claim 5, The rotary connection means, A bushing coupled to an end of the discharge pipe; A rotary tube coupled to the bush rotatably and fixed to an end of the coupling member; And And a bearing interposed between the bush and the rotary tube. The method of claim 1, A strainer is provided in the filter case, and the filtration layer is positioned above the strainer. The method of claim 1, The filter case is a water filtering device, characterized in that consisting of a cylindrical body portion and the hopper-shaped precipitate extending in the lower portion. The method of claim 8, At least one perforated plate having a plurality of through holes is formed in the settling portion of the filtration case, characterized in that the water filtering device. A first pump for sucking sludge together with water from the subwater body; A housing having a filtration layer for filtering the water and the sludge sucked by the first pump, a sludge discharge port is formed at the bottom thereof, and a supply pipe at which the sludge is filtered water is discharged; A discharge pipe for supplying the water and the sludge sucked by the first pump to a lower portion of the filtration layer inside the housing; A discharge means rotatably coupled to an end of the discharge pipe and having a plurality of discharge ports formed to be inclined in one direction toward the filtration layer, and rotating by reaction by spraying water and sludge through the discharge holes; And And a feed pipe for discharging the sludge-filtered water back to the upper layer and going back to the filtration layer. The method of claim 10, The discharge means, One end of which is coupled to communicate with the discharge pipe and is rotatably installed around the coupling part, the water quality filtering device comprising a plurality of discharge pipes formed with a plurality of discharge ports for jetting the water and sludge . delete delete The method of claim 10, And a backwashing means installed at an upper portion of the filtration layer in the housing to flow water back from the upper water body to the housing. The method of claim 14, The backwashing means, A backwash pipe extending from the upper water body to an upper portion of the filtration layer inside the housing; A second pump installed in the backwash pipe and providing a driving force to reverse flow of water; And And a plurality of backwashing pipes, one end of which is coupled to communicate with an end portion of the backwashing pipe inside the housing and rotatably around the coupling portion, the plurality of backwashing pipes formed with a plurality of backwashing holes through which the countercurrent water is injected. Water quality filtration apparatus characterized by the above-mentioned. The method of claim 15, A coupling member coupled to an end of the backwashing pipe and rotatably coupled to the backwashing pipe so that the backwashing pipe communicates with the backwashing pipe; And And a rotation connection means interposed between the coupling member and the backwash pipe so as to be rotatably coupled to each other. The method of claim 16, The rotary connection means, A bush coupled to the end of the backwash pipe; A rotary tube coupled to the bush rotatably and fixed to an end of the coupling member; And And a bearing interposed between the bush and the rotary tube. The method of claim 15, An auxiliary pipe connected to the backwash pipe; And And a compressor for injecting compressed air into the housing through the auxiliary pipe so that the sludge detained by the filtration layer is discharged through the sludge discharge port.