Water treatment facility

Abstract

The present invention relates to a water treatment facility that filters contaminated water that has flowed into the center of a filtration tank by passing it in a radial direction, and includes a guide section that guides the contaminated water to the interior center of the filtration tank, a tubular filter section arranged on the guide section, a discharge pipe section that discharges contaminants such as sludge that have been peeled off from the tubular filter section during cleaning and cleaning water to the outside of the system, and a filter cleaning section that sprays backwash cleaning water onto the tubular filter section.

Description

Technical Field

[0001] The present invention relates to a water treatment facility, and more particularly to a water treatment facility configured to be able to discharge washing water together with contaminants such as sludge peeled off during washing outside the system.

Background Art

[0002] Various contaminants generated around us can be classified into point contaminants and non-point contaminants. Point contaminants are contaminants discharged from so-called point pollution sources where the generation points are clearly limited, such as domestic sewage and industrial wastewater generated in ordinary households and factories. Non-point contaminants are contaminants that are generated in a wide range of areas without a defined contaminated area, such as agricultural land, pastureland, forest land, and roads. Examples of non-point contaminants include fertilizers and pesticides sprayed on agricultural land, livestock shed effluents, dust, heavy metals, pathogenic microorganisms, organic compounds, radioactive substances, etc. Although they remain in dust and garbage, they are washed away by initial rainwater during rainy days and flow into surrounding rivers and groundwater. Therefore, it is very important to block the direct flow of initial rainwater into rivers and groundwater. For this reason, various types of non-point pollution reduction facilities for preventing environmental pollution by non-point contaminants are applied to newly constructed cities, housing areas, areas with severe pollution, etc. These non-point pollution reduction facilities are one type of water treatment facility, and they play a role of passing initial rainwater mixed with non-point contaminants and untreated sewage overflows (CSOs, SSOs) during rainy days through them, filtering the contaminants in the rainwater, and sending them out in a state of being purified to a certain extent.

[0003] On the other hand, in order to maintain the performance of the water treatment facility for treating initial rainwater and untreated sewage overflows (CSOs, SSOs) during rainy days at the best level, various contaminants filtered by the incorporated screen filter or filter medium, so-called captured sludge, impurities, earth and sand, etc. must be removed at any time so that the filter or filter medium can perform its function as originally designed. Patent Document 1, which proposes a method for cleaning filters and filter media in water treatment facilities, discloses a method of arranging numerous nozzles around a curtain screen in order to clean the curtain screen. As mentioned above, Patent Document 1 can remove contaminants deposited or attached to a curtain screen by spraying cleaning water from a nozzle onto the curtain screen. However, there are limitations to how effectively the contaminants, such as sludge detached from the filtration elements within the curtain screen, and the cleaning water can be discharged to the outside. If such contaminants and cleaning water remain within the curtain screen, it can cause water pollution and odors. [Prior art documents] [Patent Documents]

[0004] [Patent Document 1] Korean Registered Patent Publication No. 10-0823236 [Overview of the project] [Problems that the invention aims to solve]

[0005] The present invention was made to solve the aforementioned problems, and its objective is to provide a water treatment facility that can remove pollutants from contaminated water by means of a tubular filter section in which filter material is arranged inside. In particular, the present invention is configured to allow the discharge of contaminants such as sludge and washing water to the outside when cleaning the tubular filter section, which is used to maintain the ability to remove contaminants. [Means for solving the problem]

[0006] To achieve the above objective, a water treatment facility according to a preferred embodiment of the present invention is: A guide section comprising a conical body open at the top and bottom, an inlet pipe extending from the lower part of the conical body to guide contaminated water into the filtration tank, and a number of discharge holes spaced apart in the circumferential direction and a hinge cover for opening and closing the discharge holes, and having an annular support surface arranged along the upper periphery of the conical body, A fixed frame is arranged so as to define a number of compartments along the inner periphery of the annular support surface, and a curtain filtration layer is inserted into the compartments, and a tubular filter section is provided in a cylindrical shape on the annular support surface, A number of buoyancy cylinders arranged to allow fluid communication below the discharge hole of the annular support surface, and a discharge pipe section having a duct that is in fluid communication with the number of buoyancy cylinders and extends to the outside of the filtration tank, It includes a filter cleaning unit that sprays backwashing water into the tubular filter section, Here, the tubular filter section filters the contaminated water guided by the guide section by passing it radially, while during backwashing, the contaminants detached from the filter material of the tubular filter section and the washing water can be discharged to the outside of the filtration tank via the discharge pipe section. In an embodiment of the present invention, the discharge hole can be positioned within the internal region at the lower end of the compartment. Preferably, the discharge pipe section can consist of a plurality of buoyancy cylinders having upper and lower through holes, buoyancy balls that open and close hinge covers by moving up and down due to the water level inside the buoyancy cylinders, and a duct arranged to communicate with the fluid below the plurality of buoyancy cylinders and equipped with a valve at the end of the pipe. Furthermore, the present invention may further include a branch pipe that branches off from the inlet pipe and extends to the outside of the filtration tank, and a valve provided at the end of the branch pipe. Furthermore, the present invention may further include one or more fine mesh filter sections on an annular support surface in a concentric circular structure with the tubular filter section. Selectively, the fixed frame can define a number of compartments by comprising a cylindrical punched screen arranged circumferentially on the inner edge of an annular support surface, a cylindrical fixed mesh having a diameter that expands concentrically outside the punched screen on the annular support surface, and a number of partitions spaced circumferentially between the cylindrical punched screen and the cylindrical fixed mesh. Preferably, the curtain filtration layer may comprise one or more fibrous filter materials. Furthermore, the present invention allows for the arrangement of one or more fibrous filter media and one or more fine mesh filters in the curtain filtration layer such that they become denser towards the radial direction.

[0007] The features and advantages of the present invention will become even clearer from the following detailed description based on the accompanying drawings. Prior to this, terms or words used in this specification and claims should not be interpreted in their ordinary or lexicographical sense, but rather in a sense and concept consistent with the technical idea of ​​the present invention, in accordance with the principle that inventors can appropriately define the concepts of terms in order to best describe their invention. [Effects of the Invention]

[0008] According to the above description of the present invention, the present invention not only enables effective filtration of contaminated water flowing into the filtration tank by passing it radially through the tubular filter section, but also enables the discharge of sludge and washing water detached from the fibrous filter material of the tubular filter section to the outside of the filtration tank. Furthermore, the present invention is designed to minimize the installation area by arranging the tubular filter section radially, while simultaneously improving the efficiency of pollutant treatment even in a limited space. In particular, the present invention enables the economical operation of filtration and backwashing functions in water treatment facilities without a separate power source. This can reduce the amount of electricity consumed, for example, by burning fossil fuels, and can help secure certified emission reductions (CERs) corresponding to the reduced carbon dioxide emissions resulting from the reduced electricity consumption. [Brief explanation of the drawing]

[0009] [Figure 1] This is a schematic partial cross-section diagram showing a water treatment facility according to a preferred embodiment of the present invention. [Figure 2]This is a schematic longitudinal cross-sectional view showing a water treatment facility according to a preferred embodiment of the present invention. [Figure 3] This is an exploded perspective view schematically showing the main parts of a water treatment facility according to a preferred embodiment of the present invention. [Figure 4] Figure 3 is a schematic partial cross-section diagram showing the discharge pipe section. [Figure 5] This is a schematic diagram illustrating the operational process of a water treatment facility according to a preferred embodiment of the present invention. [Modes for carrying out the invention]

[0010] The object, particular advantages, and novel features of the present invention will become even more apparent from the following detailed description and embodiments related to the accompanying drawings. In this specification, when assigning reference numerals to the components of each drawing, care should be taken to assign the same number to identical components whenever possible, even if they appear in other drawings. Furthermore, when describing the present invention, if it is determined that a specific explanation of related known technology would unnecessarily disrupt the gist of the invention, such detailed explanation will be omitted. In this specification, terms such as "first," "second," etc., are used to distinguish one component from another and do not limit the components. In the accompanying drawings, some components are exaggerated, omitted, or shown schematically, and the size of each component does not fully reflect its actual size.

[0011] The water treatment facility according to the present invention is installed, for example, in a non-point contamination area and plays a role in effectively filtering and removing non-point contaminants such as foreign matter, sediment, solid matter, suspended solids, suspended matter, and various types of garbage that flow in from non-point contamination sources mixed with initial rainwater, and its size and shape can be varied depending on the treatment capacity. Furthermore, the present invention is configured to allow contaminants such as sludge detached from the filter material, preferably fibrous filter material, placed inside the tubular filter section of the water treatment facility during backwashing, along with the wash water, to be discharged to the outside of the water treatment facility.

[0012] Hereinafter, the water treatment facility according to the present invention will be described more specifically based on the accompanying drawings. Referring to FIGS. 1 to 4, the water treatment facility according to a preferred embodiment of the present invention is configured to filter and discharge the contaminated water flowing into the inside of the filtration tank F. In addition, the water treatment facility of the present invention can arrange a pretreatment tank P upstream of the filtration tank F. The pretreatment tank P can guide the contaminated water obtained by filtering the contaminants having a certain size or more contained in the contaminated water, for example, rainwater, to the filtration tank F through the inflow pipe 12. As known to those skilled in the art, the pretreatment tank can be arranged by arbitrarily combining a coarse screen, a fine screen, and a punched screen so as to filter cigarette butts, fallen leaves, or other general garbage contained in rainwater. The punched screen can be a corrugated plate member having a large number of through holes perforated therein.

[0013] The water treatment facility of the present invention includes a guide part 10 that guides the contaminated water from a non-point pollution source or the pretreatment tank P into the inside of the filtration tank F, a tubular filter part 20 arranged on the guide part 10, and a discharge pipe and channel part 30 that discharges contaminants such as sludge peeled from the tubular filter part and the washing water to the outside of the system. In addition, the present invention includes one or more fine mesh filter parts 40 arranged on the guide part 10 in a concentric structure with the tubular filter part 20. As described above, the guide part 10 is a component that guides the contaminated water from a non-point pollution source or the pretreatment tank into the inside of the filtration tank F while holding the tubular filter part and one or more fine mesh filter parts, and includes an upper-wide and lower-narrow conical body 11 that is open up and down, an inflow pipe 12 that extends tubularly to the lower open part of the conical body, and an annular support surface 13 that is arranged along the upper peripheral edge of the conical body.

[0014] As shown in the diagram, the conical body 11 is open at the top and bottom and is formed in a funnel shape with an inner diameter that decreases from the top to the bottom. Therefore, the contaminated water flowing in through the inlet pipe 12 gradually fills the conical body and can be filtered as it passes through the tubular filter section at a slow flow rate. As described above, the inlet pipe 12 guides contaminated water from a non-point source of contamination or contaminated water that has been primary treated in the pretreatment tank P into the interior of the filtration tank F, specifically into the hollow interior surrounded by the conical body 11 and the tubular filter section 20. The annular support surface 13 is fixed to the upper periphery of the conical body 11 and can hold one or more fine mesh filter sections 40 together with the tubular filter section 20. Furthermore, the annular support surface 13 includes a number of discharge holes 131 adjacent to its inner periphery in the circumferential direction, and a hinge cover 132 that opens and closes the discharge holes 131. In the embodiment of the present invention, the hinge cover 132 is hinged to the discharge holes 131, allowing the discharge holes to be opened and closed. As shown in the figure, the number of discharge holes 131 can be arranged at equal intervals along the annular support surface 13. The discharge holes have a length that traverses the internal region of the compartment radially between the punched screen 211 and the fixed mesh 212. Preferably, the hinge cover 132 is hinged to the bottom surface of the annular support surface and is installed to be rotatable downward. The guide portion 10 may also be provided with a sealing member (not shown) along the bottom periphery of the discharge hole 131 to prevent water from flowing out through the gap between the discharge hole and the hinge cover when the hinge cover is closed. The hinge cover coupling method is already widely known, and therefore, detailed descriptions and drawings of the hinge coupling are omitted herein.

[0015] The tubular filter section 20 is arranged adjacently along the circumference on the inner peripheral edge of the annular support surface 13, and is provided in a cylindrical shape if it has a predetermined thickness on the support surface. As shown in the figure, the tubular filter section can be formed in a cylindrical shape with a predetermined thickness so that contaminated water guided by the inlet pipe 12 can be filtered while passing through in the radial direction, but is not limited to this, and can be made of a hollow structure with a closed cross-section such as a square tube. Specifically, the tubular filter section 20 consists of a fixed frame 21 that defines a number of compartments 21a, and a curtain filtration layer 22 that is inserted and positioned in the compartments 21a. The fixed frame 21 comprises a cylindrical punched screen 211 arranged adjacently along the circumference on the inner circumferential edge of the annular support surface, a cylindrical fixed mesh 212 concentrically arranged on the annular support surface along the circumferential direction with a different diameter from the punched screen 211, and a number of partition walls 213 that divide the space between the cylindrical punched screen 211 and the cylindrical fixed mesh 212. In other words, the tubular filter section can be given a predetermined thickness to the fixed frame 21 by forming the cylindrical fixed mesh 212 with a larger diameter than the cylindrical punched screen 211, thereby securing a space between the fixed mesh and the punched screen. Furthermore, the fixed frame 21 has numerous partition walls 213 spaced equally apart between the punched screen and the fixed mesh in order to evenly divide the space between the punched screen and the fixed mesh in the circumferential direction. The partition walls 213 are interposed radially between the punched screen 211 and the fixed mesh 212. Thus, each compartment 21a is defined by the annular support surface 13, the punched screen 211, the fixed mesh 212, and the partition walls 213, and has a size and shape that can accommodate the curtain filtration layer 22. As a result, the fixed frame 21 can not only ensure radial flow of contaminated water or central flow of washing water by the punched screen 211 and fixed mesh 212, but its top surface can be left open to allow the curtain filtration layer 22 to be drawn in or out into the interior of each compartment.

[0016] In embodiments of the present invention, it is preferable that the discharge holes 131 of the annular support surface 13 be located within the internal region at the lower end of each compartment 21a. In other words, the discharge holes 131 are located on the annular support surface surrounded by the fixed mesh 212, the punched screen 211, and two adjacent partition walls 213. As described above, the curtain filtration layer 22 is formed to be the size and shape that can be housed in the compartment 21a, and one or more fibrous filter media 221 are placed inside it. As is widely known, fibrous filter media are filter media made of fibers that can effectively filter out fine contaminants (fine impurities) contained in contaminated water. Selectively, one or more fibrous filter media 221 can be interchangeably installed on the lid 22a of the curtain filtration layer 22. The one or more fibrous filter media 221 are stacked radially, that is, they can be stacked so as to be spaced apart from each other radially. Furthermore, the one or more fibrous filter media 221 are extended downward so that their lower ends (including the hinge cover) can be in close contact with the annular support surface. If the lower ends of the fibrous filter media are not in close contact with the annular support surface and are separated by a distance, the flow of contaminated water will not penetrate the fibrous filter media but will escape through the separation gap, and a reliable effect cannot be expected. For reference, the fibrous filter media 221 of the curtain filtration layer 22 can be arranged in multiple layers, spaced apart from each other, with low-density fibrous filter media, medium-density fibrous filter media, and high-density fibrous filter media arranged from the inside out. Although three fibrous filter media are used in the drawing, the design is not limited to this, and two, four or more fibrous filter media can be stacked depending on the filtration efficiency.

[0017] Incidentally, the present invention may include one or more fine mesh filter sections 40 having a diameter that expands concentrically around the outside of the tubular filter section 20. One or more fine mesh filter sections 40 (41, 42) are arranged radially stacked on the outside of the tubular filter section 20, for example, the first fine mesh filter section 41 is arranged on the outside of the tubular filter section 20, while the second fine mesh filter section 42 is arranged on the outside of the first fine mesh filter section 41. Furthermore, the present invention makes the heights of the tubular filter section 20, the first fine mesh filter section 41, and the second fine mesh filter 42 different from each other. The first fine mesh filter section 41 is designed to be lower than the height of the tubular filter section 20, and correspondingly, the second fine mesh filter section 42 is designed to be lower than the height of the first fine mesh filter section 41. This is because when each filter section is blocked, a portion of the contaminated water that flows into the guide section 10 overflows the first fine mesh filter section 41 and naturally falls through the separation distance between the first fine mesh filter section and the second fine mesh filter section, and correspondingly, a portion of the contaminated water that overflows the first fine mesh filter section overflows the second fine mesh filter section 42 and can be transferred into the filtration tank F. One or more fine mesh filter sections are mesh plates having fine meshes of different sizes, and the first fine mesh filter section 41 is a plate-shaped filter member having a smaller mesh size than the tubular filter section 20. The first fine mesh filter section filters out contaminants that have passed through the tubular filter section, while allowing water to pass through. Contaminants that have passed through the first fine mesh filter section 41 are filtered and removed by the second fine mesh filter section 42. The second fine mesh filter section 42 has a denser structure than the first fine mesh filter section 41 and ultimately filters out the contaminants. In summary, the present invention allows one or more fibrous filter materials 221 and one or more fine mesh filter sections 40 (41, 42) to be arranged in a curtain filtration layer such that the density increases radially. The treated water that has passed through the second fine mesh filter section 42 is clean water in which pollutants have been treated to levels below permissible limits. It flows radially from the center of the filtration tank F, across the tubular filter section and one or more fine mesh filter sections, filling the inside of the filtration tank F with treated water, overflowing the drainage weir, and is discharged through the outlet pipe 14. Selectively, the present invention may also further incorporate a cylindrical screen (not shown) inside the tubular filter portion. Furthermore, the present invention may include a filter cleaning unit 50 that performs a backwashing function to maintain the contaminant removal capacity of the tubular filter unit 20 that performs the filtration function and one or more fine mesh filter units 40. The filter cleaning unit 50 may be formed by a backwashing device that achieves the backwashing function via a cleaning water jet, such as the filter cleaning device disclosed in Korean Patent No. 10-1400313 filed on July 15, 2013, the details of which are incorporated herein by reference. However, the present invention may include any backwashing device that can backwash the tubular filter unit and one or more fine mesh filter units.

[0018] A water treatment facility according to a preferred embodiment of the present invention can perform backwashing by spraying cleaning water while the filter cleaning unit 50 rotates around the tubular filter unit 20, and includes a discharge pipe section 30 that can discharge the sludge and cleaning water adhering to the punched screen 211, fixed mesh 212, and fibrous filter material 221 of the tubular filter unit 20 during the backwashing process, to the water treatment facility, i.e., to the outside of the system. The discharge pipe section 30 comprises a number of buoyancy cylinders 31 arranged below the annular support surface 13 so as to be able to communicate with fluids, a buoyancy ball 32 that opens and closes a hinge cover 132 by moving up and down in the buoyancy cylinders 31, and a duct 33 that is in fluid communication with the number of buoyancy cylinders 31. Preferably, the duct 33 is in fluid communication with the number of buoyancy cylinders 31 and extends to the outside of the filtration tank F. The duct 33 is also equipped with a valve V3 at the end of the duct that extends to the outside of the filtration tank F. As shown in the figure, the buoyancy cylinder 31 is interposed between the annular support surface 13 and the duct 33, and helps to enable fluid communication between the tubular filter section 20 held on the annular support surface 13 and the duct 33. For this purpose, the buoyancy cylinder 31 is formed as a chamber structure that is open at the top and bottom. That is, the upper through hole (not indicated by reference numeral) of the buoyancy cylinder 31 is positioned on the bottom surface of the annular support surface 13, which corresponds to the discharge hole 131, while the lower through hole (not indicated by reference numeral) of the buoyancy cylinder is aligned with a through hole formed on the upper surface of the duct 33. As mentioned above, the buoyancy cylinder 31 is formed to be of a size and shape that allows a spherical buoyancy ball 32 to move up and down according to the water level inside it. The buoyancy ball 32 can be made of stainless steel, which has chemical resistance and corrosion resistance. Furthermore, the buoyancy cylinder 31 is designed so that the buoyancy ball 32 does not block the lower through-hole of the buoyancy cylinder 31. For example, the lower through-hole is formed as a square-shaped hole and has a width smaller than the outer diameter of the buoyancy ball to prevent the buoyancy ball from falling out downwards. This ensures that even if the water level inside the buoyancy cylinder 31 drops and the buoyancy ball 32 descends, the spherical surface of the buoyancy ball 32 cannot completely cover the boundary of the lower through-hole, thus allowing water to move through the gap between the buoyancy ball and the lower through-hole. Optionally, the buoyancy cylinder 31 can also be configured to prevent the buoyancy ball 32 from seating in the lower through-hole by placing a filter screen 311 in the lower through-hole.

[0019] As described above, the duct 33 is arranged in an annular shape so as to be able to communicate with a number of buoyancy cylinders 31 that are individually positioned and fixed below a number of discharge holes 131 formed in the circumferential direction adjacent to the inner peripheral edge of the annular support surface 13, and a valve V3 is installed at the end of the pipe extending from one of its surfaces. Selectively, the present invention installs a valve V1 at the end of a branch pipe 15 that branches off from the inlet pipe 12 and extends to the outside of the filtration tank F. During backwashing, if some of the washing water, along with contaminants such as sludge detached from the tubular filter section 20, penetrates the tubular filter section and flows into the conical body 11 of the guide section 10, the valve V1 of the branch pipe can be opened to discharge it to the outside.

[0020] Figure 5 is a schematic diagram illustrating the operational process of a water treatment facility according to a preferred embodiment of the present invention. In a water treatment facility according to a preferred embodiment of the present invention, contaminants such as sludge detached from the tubular filter section 20 as described above during the backwashing process, along with the washing water, can be discharged to the outside of the filtration tank via the discharge pipe section 30 (see Figure 5(a)). Preferably, in order to realize the backwashing function, the present invention discharges the treated water filtered by the tubular filter section 20 and one or more fine mesh filter sections to the outside of the filtration tank F, and then releases the water filled inside the duct 33 to the outside by opening the valve V3 (see Figure 1). As a result, the buoyancy ball 32 moves downward as the water level in the buoyancy cylinder 31 decreases, and as a result the hinge cover 132 can be opened. The tubular filter section is backwashed by driving the filter washing section 50, and the sludge adhering to the tubular filter section 20 can be detached by the injection supply of washing water. As mentioned above, the washing water, along with contaminants such as sludge that have been detached from the fibrous filter material of the tubular filter section, can be discharged to the outside via the open hinge cover 132, buoyancy cylinder 31, and duct 33. In contrast, during other processes besides backwashing, such as filtration, valve V3 is closed, and the contaminated water flowing into the inlet pipe 12 is filtered as it flows radially through the tubular filter section from the inner hollow region of the tubular filter section. The treated water in the tubular filter section fills the inside of the discharge pipe section, i.e., the duct 33 and the buoyancy cylinder 31, through the open hinge cover, and as the water level in the buoyancy cylinder 31 rises, the buoyancy ball 32 moves upward, which in turn causes the hinge cover 132 to pivot upward and close the discharge hole 131, thereby confining the contaminated water radially and providing an effective filtration function.

[0021] In other words, a water treatment facility according to a preferred embodiment of the present invention can effectively discharge sludge and wash water detached from the fibrous filter media and removed from the system during backwashing without a separate power source. Although the present invention has been described in detail above with reference to embodiments, this is merely for the purpose of specifically illustrating the present invention, and it is clear that the water treatment facilities according to the present invention are not limited thereto, and that modifications or improvements can be made within the technical concept of the present invention by those with ordinary skill in the art. Any mere modification or alteration of the present invention falls within the scope of the invention, and the specific scope of protection of the present invention will be made clear by the appended claims.

Claims

1. A guide section (10) comprising a conical body (11) open at the top and bottom, an inlet pipe (12) extending from the lower part of the conical body (11) to guide contaminated water into the inside of the filtration tank (F), and a number of discharge holes (131) spaced apart in the circumferential direction and a hinge cover (132) for opening and closing the discharge holes (131), and having an annular support surface (13) arranged along the upper periphery of the conical body (11), The fixed frame (21) is arranged so as to define a number of compartments (21a) along the inner periphery of the annular support surface (13), and a curtain filter layer (22) is inserted into the compartments (21a), and a tubular filter section (20) is provided in a cylindrical shape on the annular support surface, A number of buoyancy cylinders (31) are arranged to be fluid-communicated below the discharge hole (131) of the annular support surface (13), and a discharge pipe section (30) is provided with a duct (33) that is fluid-communicated with the number of buoyancy cylinders (31) and extends to the outside of the filtration tank (F), One or more fine mesh filter sections (40; 41, 42) are arranged on the annular support surface (13) in a concentric circular structure on the outside of the tubular filter section (20), The system includes the tubular filter section (20) and a filter cleaning section (50) that sprays backwashing water onto one or more fine mesh filter sections (40; 41, 42), The tubular filter section (20) filters contaminated water guided by the guide section (10) by passing it radially, and during backwashing, the contaminants detached from the filter material of the tubular filter section and the washing water are discharged to the outside of the filtration tank via the discharge pipe section (30), in a water treatment facility.

2. The water treatment facility according to claim 1, wherein the discharge hole (131) is located within the internal region of the compartment (21a).

3. The aforementioned discharge pipe section (30) is, A number of buoyancy tubes (31) having upper through holes and lower through holes, A buoyancy ball (32) opens and closes the hinge cover (132) by moving up and down due to the water level inside the buoyancy cylinder, The numerous buoyancy tubes (31) are arranged to communicate with fluid at their lower ends, and a valve (V) is located at the end of the tube. 3 A water treatment facility according to claim 1, comprising a duct (33) equipped with )

4. The inlet pipe (12) includes a branch pipe (15) that branches off from the inlet pipe and extends to the outside of the filtration tank (F), and a valve (V) provided at the end of the branch pipe (15). 1 A water treatment facility according to claim 1, comprising ) and .

5. The fixing frame (21) includes a cylindrical punching screen (211) arranged circumferentially on the inner peripheral edge of the annular support surface (13), and a cylindrical fixing mesh (212) having a diameter that expands concentrically outside the punching screen (211) on the annular support surface. The water treatment facility according to claim 1, wherein the numerous partition walls (213) are separated circumferentially between the cylindrical punching screen (211) and the cylindrical fixed mesh (212) to define the numerous compartments (21a).

6. The water treatment facility according to claim 1, wherein the curtain filtration layer (22) comprises one or more fibrous filter media (221).

7. The water treatment facility according to claim 1, wherein the curtain filtration layer (22) and the one or more fine mesh filters (40; 41, 42) are arranged to become denser towards the radial direction.

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