JP7030032B2 - Filtration device - Google Patents

Description

Application of Article 30, Paragraph 2 of the Patent Law Metawater Co., Ltd., Japan Sewage Works Agency, Matsumoto City Joint Research Organization, which was jointly established by METAWATER Co., Ltd., Japan Sewage Works Agency, and Matsumoto City, is located in Matsumoto City, Nagano Prefecture. Installed at Ryoshima Purification Center (3-1 Ryoshima, Matsumoto City, Nagano Prefecture)

The present invention relates to, for example, a filtration device for filtering water to be treated in clean water, sewage, and the like.

Conventionally, in a water treatment plant, a sewage treatment plant, etc., the water to be treated is stored in a settling tank to precipitate solids, and then the water to be treated is further filtered installed in the settling tank. It is filtered by passing it through a member in an upward flow.

For example, Patent Document 1 below includes a settling section for precipitating solid content in water to be treated and a filtering section for filtering the water to be treated that has passed through the settling section in an upward flow, and the filtering section has a plurality of sections to be treated. It has a water flow path, and the water flow path to be treated is provided with a filter medium layer composed of a plurality of filter media, an upper screen provided above the filter medium layer to prevent the outflow of the filter medium, and a filter medium below the filter medium layer. A settling basin is described, which consists of a lower screen that supports the layer.

Further, Patent Document 2 below describes a cartridge-type filtration device having a structure in which a metal fitting mounting plate is arranged above in a filtration tank and a plurality of cartridge filters are suspended and supported on the metal fitting mounting plate. ing.

By the way, the settling tank is generally manufactured from a concrete material, a steel material, or the like, and has a box shape with an upper opening. In such a settling tank, a pair of beams may be erected in the upper opening for reinforcement or the like. In this case, a settling tank having a structure in which the filter body is suspended and supported may be adopted, as in the structure in which the cartridge filter is suspended and supported as described in Patent Document 2.

As shown in FIG. 17, the settling tank 100 having the above structure has a pair of outer walls 101 and 101, and has a substantially box shape having an upper opening 102 above the upper opening 102, and the upper opening 102 has a pair. Beams 103 and 103 are erected. Further, a pair of water channel forming walls 104 and 104 are provided below the pair of beams 103 and 103, and a water channel 105 through which filtered water flows is defined between each outer wall 101 and each water channel forming wall 104. It is made. Then, the filter body 110 is lowered by a crane or the like so as to avoid the pair of beams 103 and 103 which are obstacles and pass between them, and the filter body 110 is installed in the settling tank 100, and the filter body 110 is installed on the outer wall 101. , 101, and a suspension girder 107 placed on a pair of beams 103 and 103, are suspended and supported via a support portion 109.

Japanese Unexamined Patent Publication No. 2016-175009 JP-A-2015-206160

By the way, when the water to be treated is filtered, the larger the filtration area of the filtration structure in the settling tank, the higher the treatment performance of the filtration treatment. However, in the settling tank 100 shown in FIG. 17, the filter body 110 is lowered by a crane or the like while avoiding the pair of beams 103, 103, etc., which are obstacles, and passing between the beams 103, 103, etc., and installed in the settling tank 100. Since it has a structure, it is difficult to form the filter body 110 wide. Further, in a state where the filter body 110 is installed in the settling tank 100, as shown in FIG. 17, a useless gap S is generated between the filter body 110 and the water channel forming wall 104, and such a gap S is filled. There is no structure of. Therefore, it is difficult to secure a large filtration area of the filter body 110 in the settling tank 100.

Therefore, an object of the present invention is to provide a filtration device capable of securing a large filtration area in the settling tank even if there is an obstacle such as a beam above the settling tank.

In order to achieve the above object, the filtration device of the present invention is installed in a settling tank in which the water to be treated is stored and the solid content in the water to be treated is settled, and the settling tank is installed to settle the solid content. The settling tank is provided with a filtration cassette for circulating and filtering the water to be treated by an upward flow, and the settling tank has a pair of wall portions arranged opposite to each other, and between these wall portions. At least a pair of receiving girders are erected on the receiving girder, and rails are installed on each receiving girder. The filtration cassette is attached to a housing, a filtering material arranged in the housing, and the housing. The hanger is provided with a hanger that suspends and supports the housing, and the hanger is provided with a support portion that is supported by at least a pair of receiving girders of the settling tank, and each support portion is on the rail. Each of the wheels supported by the filter cassette is provided so that the filter cassette can be moved along the rail when the filter cassette is installed.

According to the present invention, the filtration cassette is lifted by a crane or the like via a hanger and placed at a predetermined position in the settling tank, then the filtration cassette is lowered and the wheels provided on the pair of support portions of the hanger are attached to the settling tank. By supporting the filtration cassettes on the rails installed on the pair of receiving girders, the filtration cassette can be movably arranged along the rails in the settling tank. Therefore, when installing the filtration cassette, the filtration cassette supported by a crane or the like is lowered via a hanger, wheels are placed on the rail to support the filtration cassette, and then the filtration cassette is moved along the rail to enter the settling tank. The position of can be adjusted. Therefore, the filtration cassette can be installed at a desired position in the settling tank, and it becomes easy to install a plurality of filtration cassettes in parallel in the settling tank.

Then, even if there is an obstacle above the settling tank, the filtration cassette is placed in the settling tank to avoid it, the wheels are supported by the rail, and then the filtration cassette is moved along the rail. The filtration cassette can be moved to the corner of the settling tank by passing under the obstacle, and the filtration structure can be reliably provided in the settling tank without being affected by the shape and structure of the settling tank. Further, by installing the filtration cassette close to the corner in the settling tank, the space for installing the filtration cassette in the settling tank can be used without waste, and it becomes easy to install a plurality of filtration cassettes in the settling tank. A large filtration area can be secured.

In the filtration device of the present invention, a pair of beams orthogonal to the pair of receiving girders are arranged in the opening above the pair of receiving girders of the settling tank, and the filtering cassette is the pair. It is preferable that the width is formed so that it can pass between the beams.

According to the above aspect, in the opening above the receiving girder of the settling tank, a pair of beams orthogonal to the pair of receiving girders are arranged above the same pair of receiving girders, and the filtration cassette is a pair. Since it is formed to have a width that allows it to pass between the beams, the filtration cassette can be lowered through the pair of beams to support the wheels on the rails. By moving the filtration cassette along the rail in that state, the filtration cassette can be arranged below the beam, and the filtration cassette can be installed without the installation area being restricted by the pair of beams. Further, since the pair of beams are arranged in the opening above the settling tank, the rigidity of the settling tank can be increased.

According to the present invention, even if there is an obstacle above the settling tank, the filtration cassette is inserted into the settling tank to avoid it, the wheels are supported by the rail, and then the filtration cassette is moved along the rail. Therefore, the filtration cassette can be moved to the inner corner of the settling tank by passing under the obstacle, and the filtration structure can be provided without being affected by the shape of the settling tank. In addition, by installing the filtration cassette close to the corner inside the settling tank, the space for installing the filtration cassette in the settling tank can be used without waste, and it becomes easier to install multiple filtration cassettes, so that the settling tank can be installed. A large filtration area can be secured.

It is a perspective view which shows one Embodiment of the filtration apparatus which concerns on this invention. It is a perspective view which shows the state of the whole settling tank in which the same filtration apparatus is used. It is a schematic block diagram of the filtration apparatus. It is explanatory drawing of the filtration apparatus. It is a top view of the filtration device. It is an enlarged explanatory view of the main part of the filtration device. It is an enlarged perspective view of the filtration cassette which constitutes the filtration apparatus. (A) is a cross-sectional explanatory view of the filtration cassette, and (b) is a schematic explanatory view explaining the relationship between the internal space of the filtration cassette and the filter material. It is an enlarged perspective view of the main part of the filtration cassette. It is a perspective view of the filter material which constitutes the same filtration cassette. The bonding structure between adjacent filtration cassettes is shown, (a) is an enlarged plan view of the main part, and (b) is an enlarged front view of the main part. The installation process of the filtration device is shown, (a) is an explanatory diagram showing the first step, and (b) is an explanatory diagram showing the second step. The installation process of the filtration device is shown, (a) is an explanatory diagram showing the third step, and (b) is an explanatory diagram showing the fourth step. The installation process of the filtration device is shown, and it is explanatory drawing which shows the 5th process. The installation process of the filtration device is shown, and it is explanatory drawing which shows the 6th process. The installation process of the filtration device is shown, and it is explanatory drawing which shows the 7th process. It is explanatory drawing which shows the schematic structure of the settling tank of a conventional example.

Hereinafter, an embodiment of the filtration device according to the present invention will be described with reference to the drawings.

This filtration device precipitates and removes suspended solids such as sand and soil and other substances to be removed contained in the water to be treated, and further filters the water to be treated after the precipitation has been removed. It is a thing. Specifically, this filtration device is a solid-liquid separator that separates, concentrates, recovers, and removes foreign substances in water and liquids by utilizing the difference in specific gravity between liquids and solids, for example, in the field of industrial water treatment. It can be used for the first settling basin and the final settling basin in the sewage treatment field, and the place of use is not particularly limited.

As shown in FIG. 1, the filtration device 10 of this embodiment is installed in a settling tank 20 in which the water to be treated W is stored and the solid content in the water to be treated W is settled, and in the settling tank 20. It is provided with filtration cassettes 50 and 50A for circulating and filtering the water W to be treated in which the solid content is precipitated by an upward flow F1 (see FIG. 3: a flow from the lower side to the upper side of the settling tank 20). .. In this embodiment, a plurality of filtration cassettes (three in this case) are installed in parallel in the settling tank 20, but they are arranged on the left and right sides of the settling tank 20 in the width direction H. The structure of the filtration cassette 50A arranged between the filtration cassettes 50 and 50 is slightly different from that of the filtration cassettes 50 and 50.

Referring to FIG. 2 together, the settling tank 20 of this embodiment has a pair of outer wall portions 21 and 21 and two partition wall portions 23 and 23 arranged in parallel between them, and both sides thereof are outer wall portions 21. And / or three rows of water channels surrounded by the partition wall 23 are formed. Bridge girders 24 are formed at predetermined intervals in the upper part of each channel. Further, a bottom wall portion 25 is arranged below the settling tank 20. Further, an opening 27 is formed above the settling tank 20, and the opening 27 is divided into a plurality of sections R1, R2, and R3 by the bridge girder 24.

As shown in FIG. 3, the water to be treated W flows into the settling tank 20 from the upstream side and flows toward the downstream side. , In the following description, it is referred to as "flow direction L". Further, in the settling tank 20, the width direction orthogonal to the flow direction L is referred to as "width direction H" in the following description. The flow direction L and the width direction H mean the same direction in the description of the filtration cassette 50. Further, the compartment R1 extends long along the flow direction L of the water to be treated W, but the compartment R2 has a shape shorter than that of the compartment R1 in the flow direction L.

As shown in FIG. 2, in this embodiment, a pair of outer wall portions 21 and 21 and two partition wall portions 23 are arranged in parallel along the flow direction L of the water to be treated W, and three rows are arranged between them. A waterway is formed. Each channel is partitioned by a bridge girder 24, and two relatively long compartments R1 and R1, a relatively short compartment R2, and a terminal compartment R3 are arranged along the flow direction L.

Further, as shown in FIGS. 3 and 6, in the section R3 at the end of each row, the treated water after air-washing by the air-washing pipe 90 (see FIG. 8A), which will be described later, is placed in a washing drain tank (not shown). A discharge device 95 for sending to is provided. Further, as shown in FIG. 6, a gate G for opening and closing the downstream opening of the drainage channel D is provided on the downstream side of the drainage channel D, which will be described later, of the settling tank 20 so as to be openable and closable. Then, in the state where the gate G is open, the water to be treated W can flow from the downstream opening of the drainage channel D, which will be described later, to the further downstream side of the settling tank 20 (see arrow F4), while the gate G. In the closed state, the treated water after air-washing by the air-washing pipe 90 can be suppressed from being discharged to the downstream side of the settling tank 20 and sent to the above-mentioned section R3 (. See arrow F5).

Then, as shown in FIGS. 1, 4, and 5, both side wall portions forming each water channel, here, between the outer wall portion 21 and the partition wall portion 23 adjacent thereto, or the partition wall portions 23 adjacent to each other, At least a pair of receiving girders 29 and 29 are erected between the 23.

In this embodiment, in each of the compartments R1 and R2, on the upstream side and the downstream side of the flow direction L of the water to be treated W, the inner surface of the outer wall portion 21 and the inner surface of the partition wall portion 23 are opposed to each other, or the partition wall portion. Brackets 31 are fixed to facing positions on the inner surfaces of 23 and 23, respectively. That is, four brackets 31 are fixed to the inner surface of the wall portion in each of the compartments R1 and R2.

Further, as shown in FIGS. 15 and 16, a jack device 33 having a rod 33a that can be expanded and contracted by hydraulic pressure or the like is installed on each bracket 31. Then, a substantially H-shaped cross section (see FIG. 7) is formed on the rods 33a, 33a of the jack devices 33, 33 of the pair of left and right brackets 31, 31 aligned in the width direction H of the settling tank 20. Both ends of the receiving girder 29 in the longitudinal direction are arranged, and the receiving girder 29 is erected. That is, in each of the sections R1 and R2, a pair of receiving girders 29 and 29 are erected on the upstream side and the downstream side so as to be orthogonal to the flow direction L of the water to be treated W, respectively.

Since each receiving girder 29 is erected via the jack device 33, it can be raised and lowered as shown in FIGS. 15 and 16. Further, as shown in FIG. 9, one rail 35 extending in an elongated plate shape along the longitudinal direction of the receiving girder 29 is installed at the center of the upper surface of each receiving girder 29 in the width direction. The rail 35 of this embodiment has a single ridge extending in the shape of an elongated plate. For example, the rail 35 may be a rail composed of a pair of ridges parallel to each other, or may have a shape extending in a concave groove shape. The shape and structure may be such that the wheels provided on the filtration cassette side, which will be described later, can be rotatably supported.

Further, as shown in FIGS. 1, 2, and 4, the opening 27 of the settling tank 20 is orthogonal to the pair of receiving girders 29, 29 above the pair of receiving girders 29, 29. , A pair of beams 37, 37 are arranged. In this embodiment, a pair of beams 37, 37 are arranged above the openings 27 in each of the sections R1 and R2 of the settling tank 20 at right angles to the pair of receiving girders 29, 29. Further, the distance between the pair of beams 37, 37 is wider than the width of the filtration cassette 50 (the width orthogonal to the flow direction L), so that the filtration cassette 50 can pass between the pair of beams 37, 37. (See FIGS. 1 and 12 (b)).

As shown in FIG. 1, the gap between the outer wall portion 21 and the beam 37 and the gap between the partition wall portion 23 and the beam 37 are closed by the oblong plate-shaped lid plate 39. It has become.

Further, as shown in FIGS. 1 and 4, the inside of the facing wall portions of the respective compartments R1 and R2, here, the inside of the outer wall portion 21 and the inside of the partition wall portion 23 adjacent thereto, or the partition wall portion adjacent to each other. Inside the 23, 23, a pair of drainage channel forming wall portions 41, 41 forming a drainage channel D for draining the treated water W filtered by the filtration cassette 50 forms a flow direction L of the treated water W. It is extended along. In this embodiment, as shown in FIG. 4, each drainage channel forming wall portion 41 is vertically provided from the bottom portion 41a projecting horizontally from the inner surface of each wall portion 21 and 23 and the tip portion in the projecting direction of the bottom portion 41a. It has a substantially L-shape including the side portions 41b, and as shown in FIG. 1, it extends in a gutter shape along the flow direction L. Further, the pair of drainage channel forming wall portions 41, 41 are located below both ends in the longitudinal direction of the receiving girder 29. In other words, a pair of receiving girders 29 are erected above the pair of drainage channel forming wall portions 41, 41.

Further, as shown in FIG. 4, the side portion of the filtration cassette 50 is supported on the inner surface of each drainage channel forming wall portion 41, that is, the inner surface surface of the side portion 41b constituting each drainage channel forming wall portion 41. The first wing member 43 is provided. The first wing member 43 has a substantially L-shaped angle shape including a mounting portion 43a, a receiving portion 43b perpendicular to the mounting portion 43a, and a substantially triangular plate-shaped reinforcing plate 43c mounted between the mounting portion 43a and the receiving portion 43b. In addition, it has a shape extending along the longitudinal direction of the drainage channel forming wall portion 41. The first wing member 43 has a drainage channel via the mounting portion 43a so that the receiving portion 43b is oriented horizontally and the position is substantially aligned with the upper end of the side portion 41b of the drainage channel forming wall portion 41. It is attached to the side portion 41b of the forming wall portion 41 (see FIG. 4).

The structure and shape of the settling tank 20 described above are merely examples and are not limited.

Next, the filtration cassettes 50 and 50A will be described. In this embodiment, a plurality (three in this case) are installed in parallel in each section R1 and R2 of the settling tank 20, but one installed in the width direction H of each section R1 and R2 is installed. , The filtration cassettes 50 and 50, and the one arranged between them is the filtration cassette 50A.

Then, as shown in FIGS. 1, 7, and 8 (a), the filtration cassettes 50 and 50A are attached to the housing 51, the filter material 53 arranged in the housing 51, and the housing 51. It is equipped with a hanger 55 that is attached and lifts and supports the housing 51. Further, in the filtration cassettes 50 and 50A, since the hanger 55 is attached to the housing 51 and the filter material 63 is arranged in the housing 51, the housing 51, the filter material 53, and the hanger 55 are separated from each other. So to speak, it has an integrated structure.

The housing 51 has a housing frame 60 that forms the skeleton of the housing 51. The housing frame 60 of this embodiment is formed by combining a plurality of vertical frames 60a extending in the vertical direction and a plurality of horizontal frames 60b extending in the horizontal direction, and is installed in the settling tank 20 in a state where the water to be treated W It has a substantially rectangular box shape that extends long in the flow direction L of. Further, the width of the housing frame 60 (the length in the width direction H orthogonal to the flow direction L) is formed so as to be able to pass between the pair of beams 37, 37.

The housing frame 60 of the filtration cassette 50 installed in the compartment R2 of the settling tank 20 is formed to have a shorter length than the housing frame 60 of the filtration cassette 50 installed in the compartment R1. , Other structures and shapes are the same, so the description thereof will be omitted.

Further, the housing frame 60 is provided with an elongated upper opening and a lower opening above and below the housing frame 60, and is also provided with a plurality of side openings on the sides. Further, the plurality of side openings of the housing frame 60 are closed by the side wall 61, and the side surface of the housing frame 60 is surrounded by the side wall 61, so that the water to be treated W and filtration from the side surface of the housing frame 60 can be obtained. The discharge of material 53 is regulated.

Further, the upper perforated plate 63 and the lower perforated plate 65, which allow the water to be treated W to pass through the upper opening and the lower opening of the housing frame 60 but block the passage of the filter medium 53, are provided. Have been placed. The housing 51 is surrounded by the perforated plates 63, 65 and the side wall 61, so that the internal space 66 is defined as shown in FIG. 8A. .. The internal space 66 is not divided by the vertical frame 60a of the housing frame 60, but communicates from one end to the other end of the housing 51 in the longitudinal direction.

Further, the upper perforated plate 63 and the lower perforated plate 65 in this embodiment have a substantially rectangular plate shape, and a plurality of reinforcing ribs 63a, 65a are erected from above or below the rectangular plate. .. Further, as shown in FIG. 8A, a plurality of through holes 63b and 65b penetrating in the plate thickness direction are formed in each of the upper perforated plate 63 and the lower perforated plate 65, respectively. Further, each of the through holes 63b and 65b is formed with an inner diameter that allows the passage of the water to be treated W to pass but prevents the passage of the filter material 53. As shown in FIGS. 5 and 7, a plurality of perforated plates 63, 65 are arranged in the upper opening or the lower opening along the longitudinal direction of the housing frame 60.

As shown in FIG. 10, the filter medium 53 in this embodiment has a substantially cylindrical shape made of, for example, polyurethane, polyethylene, styrofoam, sponge, etc., and is provided with innumerable irregularities 53a on its outer and inner surfaces. It has a shape. Further, the filter material 53 is preferably made of a material having a specific gravity floating on water and having a shape and structure floating on water. By filling the housing 51 with a plurality of such filtering materials 53, as shown in FIG. 8A, the upper perforated plate 63 and the lower perforated plate 63, which will be described later, are inside the housing 51. A filtration layer 57 is formed between 65. The filter layer 57 is filled with a plurality of filter media 53 to form a three-dimensional fine gap between the filter media 53 (see FIG. 8A). Through this gap, the solid matter of the water to be treated W stored in the settling tank 20 that cannot be removed by precipitation can be captured and the water to be treated W can be filtered.

In the filtration cassettes 50 and 50A installed in the settling tank 20, the water to be treated W is introduced into the internal space 66 from the through hole 65b of the lower perforated plate 65 by the upward flow F1 (see FIG. 8A). The filtration layer 57 is pushed up by the upward flow F1 at that time and floats, so that the filtration layer 57 is closer to the upper side of the internal space 66. (See FIG. 8A). At this time, the volume of the internal space 66 is preferably provided so as to be 30% or more larger than the total volume of the filter material 53 arranged in the internal space 66. That is, as shown in FIG. 8B, when the total volume of the internal space 66 of the filtration cassette is "S1" and the total volume of the filter material 53 arranged in the internal space 66 is "S2". , S1 is preferably 30% or more larger than S2 (in other words, S2 is preferably 70% or less of S1).

On the other hand, as shown in FIG. 7, the hanger 55 has a plurality of extension frames 67 extending from the upper end of the housing frame 60, and a frame-shaped frame 69 fixed to the upper ends of the plurality of extension frames 67. is doing. In the case of this embodiment, the extension frames 67 and 67 extend upward from the upper ends of the pair of left and right vertical frames 60a and 60a arranged adjacent to each other in the width direction H of the housing frame 60, respectively. The upper ends of the extension frames 67 and 67 are connected to each other by a connecting portion 68 to be reinforced.

Further, the frame-shaped frame 69 has a substantially U-shaped cross section, and the pair of suspension arms 70 extending in the longitudinal direction (flow direction L of the water to be treated W) of the housing frame 60 constituting the housing 51, Has 70. Each hanging arm 70 is connected to the outer surface of the upper end portion of the extension frame 67. Further, each suspension arm 70 has protruding portions 70a and 70a that project from both ends of the housing frame 60 in the longitudinal direction toward the outside in the horizontal direction by a predetermined length. The adjacent projecting portions 70a, 70a of the pair of suspension arms 70, 70 are connected to both ends of the support arm 71 arranged orthogonally to the extension direction of the suspension arm 70. As a result, the frame-shaped frame 69 has a substantially square frame shape.

The hanger 55 having the above structure is provided with a pair of support portions supported by a pair of receiving girders 29 and 29 provided in the settling tank 20. In this embodiment, as shown in FIG. 7, each support arm 71 is provided with a pair of brackets 73, 73 at predetermined positions in the longitudinal direction thereof, and the wheels 75 can be rotated on each bracket 73. It is installed. Then, as shown in FIG. 9, the wheel 75 is rotatably supported on the rail 35 installed on the upper surface of the receiving girder 29, and as a result, the filtration cassette 50 is attached to the rail 35. It will be possible to move along. That is, the filtration cassette 50 is movable along the width direction H of the settling tank 20. The wheel 75 in this embodiment is composed of a pair of wheels that straddle a single rail 35 provided on the receiving girder 29 on the settling tank 20 side. The wheel has, for example, a predetermined length in the direction of the rotation axis. It may be one that extends in (in this case, the rail is preferably in the shape of a concave groove), and may have a structure that can rotate on the rail 35 provided on the receiving girder 29 on the settling tank 20 side. ..

On the other hand, in each of the sections R1 and R2 of the settling tank 20, the filtration cassette 50A arranged at the center of the width direction H has a structure in which the wheels 75 such as the filtration cassette 50 are not attached, as shown in FIG. It has become. Instead, a support protrusion 76 is projected from the outer surface of the support arm 71 of the filtration cassette 50A, and the support protrusion 76 is supported on the receiving girder 29 (FIG. 4). reference).

In the filtration cassettes 50 and 50A, the protruding portion 70a and the support arm 71 of the hanging arm 70 constituting the hanger 55 are supported by the pair of receiving girders 29 and 29, forming the "support portion" in the present invention. ing.

Further, as shown in FIG. 7, a plurality of hanging pieces 72 having wire insertion holes 72a are fixedly attached to the pair of hanging arms 70. Therefore, as shown in FIG. 1, the wire 1 is inserted into the wire insertion holes 72a, 72a of the pair of left and right hanging pieces 72, 72, and the wire 1 is hooked by the hook 3 of a crane (not shown) to hook the hanger 55. The filtration cassettes 50 and 50A can be suspended and supported via the above.

Further, as shown in FIG. 7, the weir plates 77 and 77 are upward from the upper edges of the side walls 61 and 61 located at both ends in the longitudinal direction (flow direction L of the water to be treated W) of the housing frame 60. It is extended toward. Each weir plate 77 extends from the upper edge portion of the side wall 61 at a height reaching a predetermined height of the pair of extension frames 67, 67 constituting the hanger 55, and the upper edge portion of the side wall 61 and the pair. The gap between the extension frames 67 and 67 is closed. These weir plates 77, 77 pass through the filter material 53 by the upward flow F1 (see FIGS. 3 and 8 (a)), and the flow of the water to be treated W at the upper opening of the filtration cassettes 50, 50A. It blocks the water to be treated W that is about to flow out from both ends on the L side of the direction.

Further, as shown in FIG. 7, the weir plates 77 are not arranged on both sides of the housing frame 60 along the longitudinal direction (flow direction L of the water to be treated W), and the water to be treated W is discharged. Discharge ports 79, 79 are provided to enable this. As a result, the water to be treated W discharged from each of the discharge ports 79 of the pair of filtration cassettes 50 and 50 arranged on both sides of the compartments R1 and R2 in the width direction H is settled as shown by the arrow F2 in FIG. It flows to the drainage channel D of the tank 20, and further flows toward the downstream side of the drainage channel D as shown by the arrow F4 in FIG. The water W to be treated discharged from the discharge port 79 of the filtration cassette 50A arranged between the pair of filtration cassettes 50, 50 flows to the adjacent filtration cassette 50 side as shown by the arrow F3 in FIG. do.

Further, as shown in FIG. 7, the second wing member 80 projects from the outer surface of the upper end portion of both sides of the housing frame 60 along the longitudinal direction by a predetermined length. One of the second wing members 80 can be arranged at a position facing above the first wing member 43 provided on the settling tank 20 side when the filtration cassette 50 is installed in the sections R1 and R2 of the settling tank 20. It has become. Further, the other side of the second wing member 80 of the filtration cassette 50 is arranged below the second wing member 80 of the filtration cassette 50A so as to face each other. Further, the lower surface side of the second wing member 80, which is arranged to face the upper side of the first wing member 43 on the settling tank 20 side of the filtration cassette 50, is made of a porous elastic member such as a sponge or a foamed rubber material. A compression-deformable packing 85 is attached. The packing 85 is preferably made of an elastic member.

Then, between the second wing member 80 of the filtration cassette 50 installed on both sides of each section R1 and R2 of the settling tank 20 in the width direction H and the first wing member 43 provided on the settling tank 20 side. As shown in FIG. 4, a packing 85 is arranged, and the packing 85 is crushed by the weight of the filtration cassette 50 to seal the gap between the first wing member 43 and the second wing member 80. It has become so. As a result, the gap between the drainage channel forming wall 41 and the filtration cassette 50 is sealed via the packing 85 to prevent leakage of the treated water W discharged from the discharge port 79 on one side of the filtration cassette 50. Therefore, it is possible to flow to the drainage channel D side of the settling tank 20.

Further, in each of the compartments R1 and R2 of the settling tank 20, the pair of second wing members 80, 80 protruding from both sides in the longitudinal direction of the filtration cassette 50A arranged between the pair of filtration cassettes 50, 50 , As shown in FIG. 11B, the pair of filtration cassettes 50, 50 are placed above the other second wing members 80, 80 on the opposite side of the first wing member 43.

There are gaps between the adjacent second wing members 80 and 80 of the filtration cassettes 50 and 50A on the upstream side and the downstream side of the flow direction L of the water to be treated W, and these gaps are closed plates 88. It is designed to be blocked by.

Explaining this, as shown in FIG. 11A, block plate support portions 87 are attached to both ends of the adjacent second wing members 80, 80 of the filtration cassettes 50 and 50A in the longitudinal direction. There is. Then, between the closing plate support portions 87 and 87, the closing plate 88 and the plate-shaped packing 85 located on the inner surface side thereof are arranged, and the closing plate supporting portions 87 and 87 are closed. By screwing and fixing the plate 88 and the packing 85 with bolts 89a and nuts 89b, the packing 85 is sandwiched and compressed by the peripheral edges of the closing plate support portions 87 and 87 and both side portions in the width direction of the closing plate 88. It deforms (see FIG. 11 (a)). As a result, the gaps on the upstream side and the downstream side of the flow direction L of the water to be treated W of the second wing members 80 and 80 of the filtration cassettes 50 and 50A are closed via the packing 85, and the adjacent filtration cassettes 50 are closed. , 50A The gap between them is sealed. As a result, as shown by arrows F3 in FIGS. 4 and 6, the treated water W discharged from the discharge ports 79 and 79 on both sides of the filtration cassette 50A is prevented from leaking to the left and right sides of the filtration cassette 50A. It is possible to flow to the located filtration cassettes 50, 50 side.

Further, as shown in FIGS. 5, 7, and 8 (a), air is blown from below onto the filter material 53 inside the housing 51 of the filter cassette 50 to suppress clogging of the filter material 53. An air wash pipe 90 is inserted and arranged for this purpose. In this embodiment, as shown in FIG. 5, the air wash pipe 90 is inserted and arranged from one corner of one end (downstream end) in the longitudinal direction of the filtration cassette 50. As shown in FIG. 8A, the air-washing pipe 90 is composed of a horizontal pipe 91 extending horizontally and a vertical pipe 92 suspended from the horizontal pipe 91, and is bent in a substantially L shape. It has a shaped shape. Further, the horizontal pipe 91 extends so as to cover the entire longitudinal direction of the filtration cassettes 50 and 50A, and the filter material 53 located in the range can be air-washed. The horizontal pipe 91 of the empty washing pipe 90 is located on the bottom side of the internal space 66 of the housing 51 and is located below the filtration layer 57, and the upper end of the vertical pipe 92 is the housing 51. It is inserted and arranged in the housing 51 so as to protrude from the upper opening by a predetermined length. Further, a plurality of air blowing holes (not shown) are formed in the horizontal pipe 91 of the air washing pipe 90. Further, a blower or the like for supplying air is connected to the upper end of the vertical pipe 92 via a hose or the like, and air can be blown out from the air blowing hole of the horizontal pipe 91.

A pair of air-washing pipes 90, 90 are inserted and arranged on the diagonal lines of the corners at both ends in the longitudinal direction of the filtration cassette, and one of the air-washing pipes 90 covers the range of half the width direction of the filtration cassettes 50, 50A. , The entire longitudinal direction is covered to allow the filter media 53 located in that range to be air washable, and the other air wash tube 90 covers the other half of the filter cassettes 50, 50A in the width direction over the entire longitudinal direction. The filter medium 53 located in that range may be washable.

The filtration cassettes 50 and 50A described above can be formed of a metal material such as rolled steel for general structure such as SS400 or stainless steel such as SUS304. Further, the structure and shape of the filtration cassettes 50 and 50A described above are merely examples and are not limited.

Next, the operation and effect of the filtration device 10 of the present invention will be described together with the steps of installing the filtration cassettes 50 and 50A in the settling tank 20 by the filtration device 10.

First, as shown in FIG. 12A, a pair of receiving girders 29 and 29 are erected on the facing wall portions of the respective sections R1 and R2 of the settling tank 20. Here, the brackets 31 and 31 are fixed above the pair of drainage channel forming wall portions 41 and 41 and on the facing points of the inner surface of the outer wall portion 21 and the inner surface of the partition wall portion 23, respectively, and the pair of brackets are used. Jack devices 33, 33 are installed on 31, 31, and both ends of the receiving girder 29 in the longitudinal direction are arranged on the rods 33a, 33a of these jack devices 33, 33. This is done for the upstream side and the downstream side of each section R1 and R2, and a pair of receiving girders 29 and 29 are erected so as to be orthogonal to the flow direction L of the water to be treated W.

Further, as shown in FIG. 12A, the rod 33a of the jack device 33 is extended and raised so that the receiving girder 29 is separated from the bracket 31. Further, as shown in FIG. 12B, the first wing member 43 is attached to the inner surface of each drainage channel forming wall portion 41 via the attachment portion 43a (see FIG. 4).

Next, the wire 1 inserted into the wire insertion hole 72a (see FIG. 7) of the hanger 55 is hooked by a hook 3 of a crane (not shown), and the filtration cassette 50 is lifted via the hanger 55. Then, as shown in FIG. 12B, the filtration cassette 50 is lowered from between the pair of beams 37, 37 provided in the opening 27 above the settling tank 20, and the pair of support portions of the hanger 55. Here, the wheels 75 provided on the support arm 71 are supported on the rails 35, 35 provided on the pair of receiving girders 29, 29.

After that, as shown in FIG. 13A, the filtration cassette 50 is pushed toward one side of the width direction H of each section R1 and R2 of the settling tank 20 by a pushing means or the like (not shown). Here, by pushing the filtration cassette 50 toward the outer wall portion 21, the wheels 75 rotate on the rail 35, and the filtration cassette 50 is moved along the rail 35. Then, as shown in FIG. 13 (a), the filtration cassette 50 is attached to the outer wall until the second wing member 80 of the filtration cassette 50 is located at a position facing above the first wing member 43 on the settling tank 20 side. By moving closer to the portion 21, the one side portion in the width direction of the housing 51 of the filtration cassette 50 is installed at a position adjacent to the side portion 41b of the drainage channel forming wall portion 41 on the outer wall portion 21 side.

Then, as shown in FIG. 13 (b), another filtration cassette 50 is filtered from between the pair of beams 37, 37 after the filtration cassette 50 is lifted via the hanger 55 in the same manner as described above. The cassette 50 is lowered to support the wheels 75 provided on the support arm 71 on the rails 35 and 35 of the pair of receiving girders 29 and 29. After that, the filtration cassette 50 is pushed along the rail 35 by pushing the filtration cassette 50 toward the other side of the width direction H of each section R1 and R2 of the settling tank 20, here toward the partition wall portion 23 side. And move it. Then, as shown in FIG. 13B, another filtration cassette 50 is placed in the partition wall until the second wing member 80 is located at a position facing above the first wing member 43 on the settling tank 20 side. By moving closer to the 23 side, one side portion in the width direction of the housing 51 of the filtration cassette 50 is installed at a position adjacent to the side portion 41b of the drainage channel forming wall portion 41 on the partition wall portion 23 side.

Further, after lifting the filtration cassette 50A via the hanger 55, the filtration cassette 50A is lowered from between the pair of beams 37, 37, and the support protrusion 76 provided on the support arm 71 is provided as shown in FIG. It is supported on a pair of receiving girders 29 and 29. As a result, the pair of second wing members 80, 80 of the filtration cassette 50A are arranged close to each other on both sides in the width direction H in each of the compartments R1 and R2, and the other second wing of the pair of filtration cassettes 50, 50 is arranged. Placed above the members 80, 80.

After that, as shown in FIG. 11A, the closing plate support portion 87 attached to the second wing member 80 of the filtration cassette 50 and the closing plate support portion 87 attached to the second wing member 80 of the filtration cassette 50A are provided. A closing plate 88 and a plate-shaped packing 85 are arranged between them, and the closing plate 88 and the packing 85 are screwed and fixed to the closing plate support portion 87. As a result, as shown in FIGS. 11B and 15, the packing 85 is sandwiched and compressed and deformed by the peripheral edges of the closing plate support portions 87 and 87 and both side portions in the width direction of the closing plate 88. Through the packing 85, the gaps between the second wing members 80 and 80 of the filtration cassettes 50 and 50A are closed, and the gaps between the adjacent filtration cassettes 50 and 50A are sealed.

From the above state, as shown in FIG. 16, the rods 33a and 33a of the jack devices 33 and 33 are contracted and lowered so that the receiving girder 29 is in a position close to the bracket 31. Then, the packings 85 and 85 arranged between the first wing member 43 of the filtration cassettes 50 and 50 and the second wing members 80 and 80 on the settling tank 20 side are crushed by the weight of the filtration cassette 50. Then, the gap between the first wing member 43 and the second wing member 80 is sealed, and the gap between the drainage channel forming wall portion 41 and the filtration cassette 50 is sealed via the packing 85. As described above, a plurality of filtration cassettes 50 and 50A can be installed in parallel in each of the compartments R1 and R2 of the settling tank 20.

As described above, in this filtration device 10, the filtration cassette 50 is lifted by a crane or the like via a hanger 55, placed at a predetermined position in the settling tank 20, and then the filtration cassette 50 is lowered to form a pair of hangers 55. By supporting the wheels 75 provided on the support arm 71 forming the support portion of the above to the rails 35 and 35 installed on the pair of receiving girders 29 and 29 of the settling tank 20, FIGS. As shown in b), the filtration cassette 50 can be movably arranged along the rail 35 in the settling tank 20.

Therefore, when installing the filtration cassette 50, the filtration cassette 50 supported via the hanger 55 by a crane or the like is lowered, the wheels 75 are placed on the rail 35 to support the filtration cassette 50, and then the filtration cassette 50 is mounted on the rail 35. By moving along the settling tank 20, the position of the filtration cassette 50 in the settling tank 20 can be appropriately adjusted. As a result, the filtration cassette 50 can be installed at a desired position in the settling tank 20, and it becomes easy to install a plurality of filtration cassettes 50 in parallel in the settling tank 20.

Further, in this embodiment, even if there are obstacles such as a pair of beams 37, 37 in the opening 27 above the settling tank 20, the filtration cassette 50 is arranged in the settling tank 20 while avoiding them. Then, after the wheel 75 is supported by the rail 35, the filtration cassette 50 is moved along the rail 35 so that the lower side of the beam 37, which is an obstacle, can be seen as shown in FIGS. 13 (a) and 13 (b). The filtration cassette 50 can be passed through and moved to the corner inside the settling tank 20, and the filtration structure can be reliably provided in the settling tank 20 without being affected by the shape and structure of the settling tank 20. Further, by installing the filtration cassette 50 close to the corner inside the settling tank 20, the space for installing the filtration cassette in the settling tank 20 can be used without waste, and it becomes easy to install a plurality of filtration cassettes 50. .. Here, as shown in FIG. 16, a pair of filtration cassettes 50 and 50 are arranged on both sides of each section R1 and R2 of the settling tank 20 in the width direction, and the filtration cassettes 50A are arranged between them, for a total of three. The individual filtration cassettes 50 and 50A can be installed in parallel. As a result, there is an advantage that a large filtration area in the settling tank 20 can be secured.

Further, in this embodiment, as shown in FIG. 1, in the opening 27 above the pair of receiving girders 29, 29 of the settling tank 20, a pair of beams 37 orthogonal to the pair of receiving girders 29, 29 , 37 are arranged, and as shown in FIG. 12 (b), the filtration cassette 50 is formed to have a width that allows passage between the pair of beams 37, 37, so that the pair of beams 37, 37 are formed. The filtration cassette 50 can be lowered to support the wheels 75 on the rail 35 on the settling tank 20 side. Then, in that state, as shown in FIGS. 13A and 13B, by moving the filtration cassette 50 along the rail 35, the filtration cassette 50 can be arranged below the beam 37, and a pair. The beams 37 and 37 of the above allow the filtration cassette 50 to be installed without limiting the installation area of the filtration cassette 50 in the settling tank 20. Further, since the pair of beams 37, 37 are arranged in the opening 27 above the settling tank 20, the rigidity of the settling tank 20 can be increased.

Next, the treatment process of the water to be treated W will be described. That is, as shown in FIG. 3, when the water to be treated W flows into and is stored in the settling tank 20 from the upstream side, the solid content in the water to be treated W is settled and the bottom wall portion of the settling tank 20 is formed. Accumulate in 25. The solid content accumulated in the bottom wall portion 25 of the settling tank 20 can be discharged from the settling tank 20 by a discharge means (not shown).

Then, the water W to be treated in which the solid content is precipitated is subjected to the through hole 65b of the lower perforated plate 65 of the filtration cassettes 50 and 50A installed in the respective compartments R1 and R2 of the settling tank 20 by the upward flow F1. Then, it flows into the internal space 66 of each of the filtration cassettes 50 and 50A. After that, the water W to be treated is filtered by passing through the filtration layer 57 composed of the plurality of filter media 53. The filtered water W to be treated is discharged from the discharge port 79 of each of the filtration cassettes 50 and 50A. At this time, from the pair of filtration cassettes 50, 50 arranged closer to both sides in the width direction H of each of the compartments R1 and R2, as shown by the arrow F2 in FIG. 6, the settling tank 20 passes through the discharge port 79. It flows to the drainage channel D side. Further, as shown by the arrow F3 in FIG. 6, the flow flows from the discharge ports 79 and 79 of the filter cassettes 50A arranged between the pair of filter cassettes 50 and 50 to the adjacent filter cassette 50 side. Then, the water to be treated W that has flowed to the drainage channel D flows to the downstream side as shown by the arrow F4 in FIG. 4, but at this time, if the gate G on the downstream side of the drainage channel D is open, It flows to the downstream side of the settling tank 20 through the gate G.

At this time, in this embodiment, the water W to be treated in the settling tank 20 is allowed to flow into the housing 51 from the through hole 65b of the lower perforated plate 65 by the upward flow F1, and the filter medium 53 is arranged. The filtration layer 57 is passed through and filtered, and the water is discharged from the through hole 65b of the upper perforated plate 63, and the water to be treated W is blocked by the pair of dam plates 77 and 77 to form the filtration cassettes 50 and 50A. The water W to be treated can be reliably filtered by the filtration cassettes 50 and 50A, and can be discharged from the discharge port 79 of the filtration cassettes 50 and 50A.

Further, when the filtering device 10 is used for a long period of time, the amount of solid matter trapped between the filtering materials 53 increases, and clogging may occur. In order to suppress this clogging, the air wash pipe 90 is inserted and arranged in the housing 51 of the filtration cassettes 50 and 50A, and the air wash pipe 90 is used as follows.

That is, as shown in FIG. 6, with the gate G on the downstream side of the drainage channel D of the settling tank 20 closed, air is blown from the upper end of the vertical pipe 92 of the air wash pipe 90 through a hose or the like. Supply. Then, air is ejected from the plurality of air blowing holes of the horizontal pipe 91 of the air wash pipe 90, air is blown from below the filter material 53, and the filter material 53 flows inside the housing 51. Thereby, the solid matter trapped between the filter media 53 is removed, the clogging is suppressed, and the filtration performance of the filter media 53 is maintained without stopping the inflow of the water to be treated W. Can be done. As shown in FIG. 6, the treated water containing solid matter after being air-washed by the air-washing pipe 90 is sent to the section R3 and transferred to a washing / draining tank (not shown) via the discharge device 95. It is supposed to be done.

The present invention is not limited to the above-described embodiment, and various modified embodiments are possible within the scope of the gist of the present invention, and such embodiments are also included in the scope of the present invention. ..

10 Filtration device 20 Settlement tank 21 and 22 Outer wall part 23 Partition part 25 Bottom wall part 27 Opening part 29 Receiving girder 31 Bracket 33 Jacking device 35 Rail 37 Beam 39 Lid plate 41 Drainage channel forming wall part 43 First wing member 50, 50A Filter cassette 51 Housing 53 Filtering material 55 Hanger 57 Filtration layer 60 Housing frame 61 Side wall 63 Filtering material 63 Upper perforated plate 65 Lower perforated plate 66 Internal space 67 Extension frame 69 Frame-shaped frame 70 Hanging arm 70a Protruding part 71 Support arm 73 Bracket 75 Wheel 76 Support protrusion 77 Dam plate 79 Discharge port 80 Second wing member 85 Packing 87 Block plate support 88 Block plate 90 Air wash pipe 95 Discharge device D Drainage channel F1 Upstream G Gate R1, R2, R3 compartment W Processed water

Claims (2)

A settling tank in which the water to be treated is stored and the solid content in the water to be treated is settled, and the water to be treated which is installed in the settling tank and has the solid content settled are circulated by an upward flow. Equipped with a filtration cassette to filter,
The settling tank has a pair of wall portions arranged opposite to each other, and at least a pair of receiving girders are erected between these wall portions, and rails are installed on each receiving girder. ,
The filtration cassette includes a housing, a filter material arranged in the housing, and a hanger attached to the housing to suspend and support the housing.
The hanger is provided with a support portion supported by at least a pair of receiving girders of the settling tank, and each support portion is provided with a wheel supported on the rail, and the filtration cassette is installed. A filtration device characterized in that the filtration cassette is movable along the rail when the filtration cassette is used. A pair of beams orthogonal to the pair of receiving girders are arranged in the opening above the pair of receiving girders in the settling tank, and the filtration cassette can pass between the pair of beams. The filtration device according to claim 1, which is formed in a width.

Images