JP2013052341A - Filtering device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a filtering device which can improve flow distributivity.SOLUTION: The filtering device 1 comprises a first module row 3a formed by arranging multiple membrane modules 3 into a row, a second module row 3b formed by arranging multiple membrane modules 3 into a row and arranged side by side with the first module row 3a, a stock solution supply pipe 5 extending along the direction of arranging multiple membrane modules 3 into a row, and a plurality of stock solution branch pipes 7 for communicating the primary side of each membrane module 3 with the stock solution supply pipe 5.

Description

  The present invention relates to a filtration device.

  As a filtration apparatus, what was described in patent document 1, for example is known. The filtration device described in Patent Document 1 includes a plurality of membrane modules arranged in two rows, two stock solution supply pipes for supplying a stock solution to the primary side of each membrane module, and a secondary side of each membrane module And two filtrate discharge pipes for discharging the filtrate discharged from the tank, and a stock solution supply pipe and a filtrate discharge pipe are connected to each membrane module. The two stock solution supply pipes and the two filtrate discharge pipes are connected to each other by branch pipes.

Japanese Patent Laid-Open No. 11-239719

  In the configuration in which the stock solution is supplied to the two stock solution supply pipes by the branch pipe as in the above filtration device, the flow rate of the stock solution in one stock solution supply pipe and the other stock solution supply due to clogging of the membrane module or the like There may be a difference in the flow rate of the stock solution in the pipe, and there is a possibility that the flow rate distribution property becomes unstable in the two stock solution supply pipes. As a result, the supply of the stock solution to each membrane module becomes unstable. Therefore, an improvement in flow rate distribution is required in the filtration device.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a filtration device capable of improving the flow rate distribution.

  In order to solve the above-described problems, a filtration device according to the present invention includes a first module row in which a plurality of membrane modules are arranged in a row, and a plurality of membrane modules arranged in a row and in a first module row. The second module row, one undiluted solution supply pipe extending along the direction in which the plurality of membrane modules are arranged in a row, and a plurality of undiluted solution branches communicating with the primary side of each membrane module and the undiluted solution supply tube And a tube.

  In this filtration apparatus, one undiluted solution supply pipe extends along a direction in which a plurality of membrane modules are arranged in a line, and the primary side of the membrane module and the undiluted solution supply tube are connected by a undiluted solution branch tube. . In this way, by branching from one stock solution supply pipe to the membrane module via the stock solution branch pipe, the flow rate from the inflow side to the end side can be easily maintained substantially, and the stock solution supplied to the membrane module can be maintained. It becomes possible to maintain the flow rate substantially constant. Therefore, the flow rate distribution can be improved.

  A single filtrate discharge pipe extending along the direction in which the plurality of membrane modules are arranged in a line, and a plurality of filtrate branch pipes communicating the secondary side of the membrane module and the filtrate discharge pipe; The stock solution supply pipe is provided in the lower part of the membrane module, and the filtrate discharge pipe is provided in the upper part of the membrane module. In this way, by making the stock solution supply pipe and the filtrate discharge pipe the same configuration, the flow distribution in the filtration device can be further improved.

  The stock solution supply pipe has an inlet for flowing the stock solution at one end and the other end is closed, and the filtrate discharge tube has a discharge port for discharging the filtrate at one end and the other end is closed. The inlet and outlet are in the same direction. Thus, by providing the inflow port and the discharge port in the same direction, for example, when the filtration device is arranged in a narrow space, the piping can be connected from the same direction, so that the space efficiency can be improved.

  When the inner diameter of the stock solution supply pipe is D1 and the inner diameter of the stock solution branch pipe is D2, the relationship of D1: D2 = 1 to 10: 1 is satisfied.

  The stock solution supply pipe is arranged at a position corresponding to between the first module row and the second module row, and the stock solution branch pipe is a facing direction of the first and second module rows in the stock solution supply pipe. Are connected on a straight line substantially parallel to each other.

  A single concentrated liquid discharge pipe extending along a direction in which the plurality of membrane modules are arranged in a line, and a plurality of concentrated liquid branch pipes communicating the primary side of each membrane module with the concentrated liquid discharge pipe . Thereby, piping can be reduced and cost reduction can be aimed at.

  ADVANTAGE OF THE INVENTION According to this invention, the improvement of the distribution property of the flow volume in a filtration apparatus can be aimed at.

It is the figure which looked at the filtration apparatus concerning one embodiment from the side. It is the figure which looked at the filtration apparatus shown in FIG. 1 from the front. It is the figure which looked at the filtration apparatus shown in FIG. 1 from back. It is the figure which looked at the filtration apparatus shown in FIG. 1 from the top. It is the figure which looked at the filtration apparatus shown in FIG. 1 from the bottom. It is sectional drawing which shows the structure of a membrane module typically. It is a figure which expands and shows a part of filtration apparatus shown in FIG. It is a figure which expands and shows a part of filtration apparatus shown in FIG. It is a figure which shows the conventional filtration apparatus typically. It is the figure which looked at the filtration apparatus concerning other embodiments from the front. It is the figure which looked at the filtration apparatus concerning other embodiments from the front. It is the figure which looked at the filtration apparatus concerning other embodiments from the top.

  Hereinafter, preferred embodiments will be described in detail with reference to the accompanying drawings. In the description of the drawings, the same or equivalent elements will be denoted by the same reference numerals, and redundant description will be omitted.

  Drawing 1 is a figure which looked at the filtration device concerning one embodiment from the side. FIG. 2 is a front view of the filtration device shown in FIG. FIG. 3 is a view of the filtration device shown in FIG. 1 as viewed from behind. FIG. 4 is a view of the filtration device shown in FIG. 1 as viewed from above. FIG. 5 is a view of the filtration device shown in FIG. 1 as viewed from below. In the description, the terms “upper” and “lower” may be used, which correspond to the vertical direction in FIGS.

  As shown in each figure, the filtration device 1 includes a first module row 3a, a second module row 3b, a stock solution supply pipe 5, a stock solution branch pipe 7, a filtrate discharge pipe 9, and a filtrate branch. It has a pipe 11 and concentrated liquid discharge pipes 13a and 13b. The filtration device 1 is a device that receives a raw liquid such as domestic wastewater, industrial water, factory wastewater, or river water and purifies it by membrane filtration. The filtration device 1 has one or a plurality of (here, three) units 2a to 2c. Each of the units 2a to 2c is configured by arranging the above components on a frame F.

  The first module row 3 a and the second module row 3 b are constituted by the membrane module 3. The first module row 3a includes a plurality (30 in this case) of membrane modules 3 arranged in a row at a predetermined interval in the X direction. The second module row 3b is configured by arranging a plurality (here, 30) of membrane modules 3 in a row in the X direction with a predetermined interval. The first module row 3a and the second module row 3b are arranged side by side in the Y direction at a predetermined interval.

  FIG. 6 is a cross-sectional view schematically showing the configuration of the membrane module. As shown in FIG. 6, the membrane module 3 includes a hollow fiber membrane (filtration membrane) 30 that filters the stock solution, and a cylindrical housing 32 that houses the hollow fiber membrane 30. In FIG. 6, for convenience of explanation, the hollow fiber membranes 30 are shown one by one. However, the hollow fiber membranes 30 are accommodated in the housing 32 as a bundle of hollow fiber membranes (not shown) bundled in a plurality. Yes.

  Both ends of the hollow fiber membrane 30 are fixed to the fixing members 34a and 34b. The fixing members 34 a and 34 b are formed of an adhesive such as PE (polyethylene) resin, for example, and are fixed in the housing 32. In the hollow fiber membrane 30, the primary side (the lower side in the drawing) of the membrane module 3 is closed by the fixing member 34a, and the secondary side (the upper side in the drawing) is opened. That is, the inside of the hollow fiber membrane 30 communicates only with the space on the secondary side of the membrane module 3. A plurality (four in this case) of through holes 35 are formed in the fixing member 34 a disposed on the primary side of the membrane module 3.

  An inlet 32 a is provided on the primary side of the housing 32, and a discharge port 32 b is provided on the secondary side of the housing 32. A stock solution branch pipe 7 to be described later is connected to the inflow port 32a. A filtrate branch pipe 11 to be described later is connected to the discharge port 32b. Further, a concentrated liquid branch pipe 36 for discharging the concentrated stock solution is connected to the side surface of the housing 32. The concentrated liquid branch pipe 36 is connected between the fixing member 34a and the fixing member 34b. In the membrane module 3 having such a configuration, external pressure (pressurization) filtration for supplying a stock solution to the outside of the hollow fiber membrane 30 is performed.

  Returning to FIGS. 1 to 5, the stock solution supply pipe 5 is a pipe for supplying the stock solution to the primary side of the membrane module 3, and is disposed at the lower part of the membrane module 3. The stock solution supply pipe 5 is a cylindrical pipe that extends along the first module row 3a and the second module row 3b, that is, in the direction in which the membrane modules 3 are arranged in a row (X direction), and is arranged in parallel in the Y direction. It arrange | positions in the position corresponding to the intermediate position of the membrane module 3 to perform. The stock solution supply pipe 5 may be configured by a single pipe having a predetermined length, or may be configured by connecting a plurality of pipes in the axial direction. In the present embodiment, three pipes are connected corresponding to the units 2a to 2c.

  As shown in FIG. 2, an inlet 5 a through which the stock solution flows is provided on one end side (left side in FIG. 1) of the stock solution supply pipe 5. The inflow port 5a is connected to piping via a pump or the like (not shown). Moreover, as shown in FIG. 3, the other end side (the right side in FIG. 1) of the stock solution supply pipe 5 is closed. The stock solution supply pipe 5 is fixed to the frame F.

  As shown in FIG. 7, the stock solution branch pipe 7 is connected between the membrane module 3 and the stock solution supply pipe 5. The stock solution branch pipe 7 has a substantially L-shape, one end of which is connected to the primary side inlet 32 a of each membrane module 3 via a joint, and the other end is connected to the stock solution supply pipe 5. Yes. The other end of the stock solution branch pipe 7 is connected to the stock solution supply pipe 5 so as to extend from both the left and right sides of the stock solution supply pipe 5. That is, the stock solution branch pipes 7 are connected to face each other on a straight line substantially parallel to the horizontal direction.

The stock solution supply pipe 5 and the stock solution branch pipe 7 satisfy the relationship of the following expression (1), where the inside diameter of the stock solution supply pipe 5 is D1 and the inside diameter of the stock solution branch pipe 7 is D2.
D1: D2 = 1 to 10: 1 (1)
As shown in the above equation (1), the inner diameter of the stock solution supply pipe 5 is equal to or larger than the inner diameter of the stock solution branch pipe 7.

  The filtrate discharge pipe 9 is a pipe for discharging the filtrate discharged from the secondary side of the membrane module 3, and is disposed on the upper part of the membrane module 3. The filtrate discharge pipe 9 is a cylindrical pipe extending along the first module row 3a and the second module row 3b, that is, in the direction in which the membrane modules 3 are arranged in a row (X direction). It arrange | positions in the position corresponding to the intermediate position of the membrane module 3 to provide. The filtrate discharge pipe 9 may be constituted by one or a plurality of pipes connected in the axial direction. In the present embodiment, three pipes are connected corresponding to the units 2a to 2c.

  As shown in FIG. 2, a discharge port 9 a for discharging the filtrate is provided on one end side (left side in FIG. 1) of the filtrate discharge pipe 9. The discharge port 9a is connected to a filtrate tank (not shown). Moreover, as shown in FIG. 3, the other end side (the right side in FIG. 1) of the filtrate discharge pipe 9 is closed. The outlet 9 a of the filtrate discharge pipe 9 opens in the same direction as the inlet 5 a of the stock solution supply pipe 5, and is substantially the same as the inlet 5 a of the stock solution supply pipe 5 in the height direction of the filtration device 1. Located on the line.

  The filtrate branch pipe 11 is connected between the membrane module 3 and the filtrate discharge pipe 9. As shown in FIG. 3, the filtrate branch pipe 11 has a substantially L shape, and one end thereof is connected to the secondary side discharge port 32 b of each membrane module 3 via a joint, and the other end. Is connected to the filtrate discharge pipe 9. The other end of the filtrate branch pipe 11 is connected to the filtrate discharge pipe 9 so as to extend from both the left and right sides of the filtrate discharge pipe 9. That is, the filtrate branch pipes 11 are connected to face each other on a straight line substantially parallel to the horizontal direction.

  The concentrated liquid discharge pipes 13 a and 13 b extend substantially parallel to the filtrate discharge pipe 9. The concentrate discharge pipes 13a and 13b sandwich the filtrate discharge pipe 9 therebetween in the Y direction, and are disposed in a pair at substantially the same height as the filtrate discharge pipe 9. A connecting pipe 14 that consolidates the flow paths into one is connected to one end side (left side in FIG. 1) of the concentrate discharge pipes 13a and 13b. The connection pipe 14 is substantially U-shaped and extends downward from one end side of the concentrate discharge pipes 13a and 13b. The connection pipe 14 has a discharge port 14 a, which is substantially the same as the inlet 5 a of the stock solution supply pipe 5 and the discharge port 9 a of the filtrate discharge pipe 9 in the height direction of the filtration device 1. It is located in a straight line. Moreover, as shown in FIG. 3, the other end side (right side in FIG. 1) of the concentrate discharge pipes 13a and 13b is closed. A concentrated liquid branch pipe 36 is connected to the concentrated liquid discharge pipes 13a and 13b. The concentrated liquid branch pipe 36 is connected to the lower part of the concentrated liquid discharge pipes 13a and 13b.

  As shown in FIG. 8, an air supply pipe 15 is connected to each stock solution branch pipe 7. The air supply pipe 15 supplies compressed air (hereinafter, air) to the stock solution branch pipe 7. Suspended substances accumulated in the hollow fiber membrane 30 are removed by air bubbling by the air supplied from the air supply pipe 15. The air supply pipe 15 is connected to an air supply main pipe 17, and a compressor (not shown) or the like is connected to the air supply main pipe 17. In the air bubbling operation, air or nitrogen gas is supplied from the secondary side of the membrane module 3 to the membrane module 3 through the filtrate discharge pipe 9 from the filtrate tank through a backwash pump or the like. .

  The filtration method of the filtration apparatus 1 having the above configuration will be described. In the filtration device 1, the stock solution flows from the inlet 5 a of the stock solution supply pipe 5, and this stock solution is supplied to the primary side of the membrane module 3 through the stock solution branch pipe 7. In the membrane module 3, the stock solution flows into the housing 32 from the primary inflow port 32a, passes through the through hole 35 of the fixing member 34a, and the stock solution that flows between the fixing members 34a and 34b is hollow fiber membrane by external pressure. 30 is discharged as a filtrate from the outlet 32b on the secondary side. Further, the concentrated liquid that has not been filtered by the hollow fiber membrane 30 is discharged from the concentrated liquid branch pipe 36. The filtrate discharged from the discharge port 32 b is discharged to the filtrate discharge pipe 9 through the filtrate branch pipe 11. The concentrated liquid discharged from the concentrated liquid branch pipe 36 is discharged to the concentrated liquid discharge pipes 13a and 13b.

  FIG. 9 is a diagram schematically showing a conventional filtration device. As shown in FIG. 9, the conventional filtration apparatus 50 has two stock solution supply pipes 51 and 52, two filtrate discharge pipes 53 and 54, and two concentrate discharge pipes 55 and 56. The membrane liquid supply pipes 51 and 52, the filtrate discharge pipes 53 and 54, and the concentrate discharge pipes 55 and 56 are connected to the membrane modules 60, respectively. As described above, in the configuration in which the stock solution is supplied to the two stock solution supply pipes 51 and 52 by the branch pipe, the flow rate of the stock solution in one stock solution supply pipe 51 and the other stock solution are caused by clogging of the membrane module 60 or the like. There may be a difference in the flow rate of the stock solution in the stock solution supply pipe 52, and there is a possibility that the flow rate distribution in the two stock solution supply pipes 51 and 52 becomes unstable.

  On the other hand, in the filtration device 1 of the present embodiment, the stock solution supply pipe 5 extends along the direction below the membrane module 3 and the plurality of membrane modules 3 are arranged in a row, and the first and second The module rows 3a and 3b are arranged at corresponding positions. The stock solution supply pipe 5 and the primary side of the membrane module 3 are connected by a stock solution branch pipe 7. As described above, since the single stock solution supply pipe 5 is branched into each membrane module 3 via the stock solution branch pipe 7, the flow rate from the inlet 5a side to the end side (closed side) can be made substantially constant. The flow rate of the stock solution supplied to the membrane module 3 can be maintained substantially constant. Therefore, the filtration device 1 can improve the flow distribution.

  Further, in the present embodiment, the filtrate discharge pipe 9 extends above the membrane module 3 and along the direction in which the plurality of membrane modules 3 are arranged in a row, and the first and second module rows 3a and 3b. Are arranged at corresponding positions. The filtrate discharge pipe 9 and the membrane module 3 are connected by a filtrate branch pipe 11. Thus, by making the configuration of the filtrate discharge pipe 9 the same as that of the stock solution supply pipe 5, the flow distribution in the filtration device 1 can be further improved.

  In the present embodiment, the inlet 5a of the stock solution supply pipe 5 and the outlet 9a of the filtrate discharge pipe 9 are opened in the same direction. Thus, since the inlet 5a of the stock solution supply pipe 5, the outlet 9a of the filtrate outlet pipe 9, and the outlet 14a of the connecting pipe 14 of the concentrate outlet pipes 13a and 13b are opened in the same direction, for example, In the case where the filtration device 1 is arranged in a narrow space, the space efficiency can be improved.

  Moreover, in the filtration apparatus 1, since piping can be reduced compared with the conventional structure, cost reduction can be aimed at. Further, by reducing the number of pipes, the number of steps for producing the filtration device 1 can be reduced, and workability can be improved.

  Subsequently, another embodiment will be described. Drawing 10 is a figure which looked at the filtration device concerning other embodiments from the front. The filtration device 1A shown in FIG. 10 is different from the above embodiment in the configuration of the concentrate discharge pipe 13A. As shown in FIG. 10, the filtration device 1A has one concentrated liquid discharge pipe 13A. The concentrated liquid discharge pipe 13A is disposed below the filtrate discharge pipe 9 and between the first module row 3a and the second module row 3b. The membrane module 3 and the concentrate discharge pipe 13A are connected by a concentrate branch pipe 36A that extends linearly from the side surface of the housing 32 of each membrane module 3 toward the concentrate discharge pipe 13A.

  FIG. 11 is a front view of a filtration device according to another embodiment. As shown in FIG. 11, the filtration apparatus 1B is different from the above embodiment in the configuration of the concentrate discharge pipe 13B. As shown in FIG. 11, the filtration device 1B has one concentrate discharge pipe 13B. The concentrated liquid discharge pipe 13B is disposed below the filtrate discharge pipe 9 and between the first module row 3a and the second module row 3b. The membrane module 3 and the concentrate discharge pipe 13B are connected by a concentrate branch pipe 36B extending linearly from the side surface of the housing 32 of each membrane module 3 toward the concentrate discharge pipe 13B and extending upward at a substantially middle portion thereof. Has been. In such a filtration apparatus 1A, 1B, since there is one concentrate discharge pipe 13A, 13B, a simple configuration can be achieved.

  Further, in the filtration device 1A, the concentrated liquid branch pipe 36A may have the configuration shown in FIG. As shown in FIG. 12, the concentrated liquid branch pipe 36a extending from one membrane module 3 in the upper part of the figure extends at a predetermined angle with respect to the facing direction of the membrane module 3, and is connected to the concentrated liquid discharge pipe 13B. ing. Further, the concentrated solution branch pipe 36b extending from the other membrane module 3 at the lower side of the drawing extends at a predetermined angle (inclined in the facing direction) with respect to the facing direction of the membrane module 3, and the concentrated solution discharge tube 13B. It is connected to the. That is, the concentrated liquid branch pipe 36a and the concentrated liquid branch pipe 36b may not be connected on the same straight line with respect to the concentrated liquid discharge pipe 13B, and their extending directions may not be the same direction.

  The present invention is not limited to the above embodiment. For example, in the said embodiment, although the filtration apparatus 1 is comprised by several units 2a-2c, the structure of the filtration apparatus 1 is not limited to this.

  Moreover, in the said embodiment, the inflow port 5a of the stock solution supply pipe 5, the discharge port 9a of the filtrate discharge pipe 9, and the discharge port 14a of the connection pipe 14 are located in substantially the same straight line in the height direction of the filtration apparatus 1. However, the inflow port 4a, the discharge port 14 and the discharge port 14a may be arranged so as to be shifted from each other in the width direction (Y direction).

  DESCRIPTION OF SYMBOLS 1 ... Filtration apparatus, 3 ... Membrane module, 3a ... 1st module row | line | column, 3b ... 2nd module row | line | column, 5 ... Stock solution supply pipe, 5a ... Inlet, 7 ... Stock solution branch pipe, 9 ... Filtrate discharge pipe, 9a ... discharge port, 11 ... filtrate branch tube, 13a, 13b, 13A, 13B ... concentrate discharge tube, 36, 36a, 36b, 36A, 36B ... concentrate branch tube.

Claims (6)

A first module row in which a plurality of membrane modules are arranged in a row;
A plurality of membrane modules arranged in a row and a second module row arranged side by side in the first module row;
One stock solution supply pipe extending along a direction in which the plurality of membrane modules are arranged in a line;
A plurality of stock solution branch pipes communicating the primary side of each membrane module and the stock solution supply pipe;
A filtration device. One filtrate discharge pipe extending along a direction in which the plurality of membrane modules are arranged in a line;
A plurality of filtrate branch pipes communicating the secondary side of the membrane module and the filtrate discharge pipe,
The stock solution supply pipe is provided in a lower part of the membrane module,
The filtration apparatus according to claim 1, wherein the filtrate discharge pipe is provided at an upper portion of the membrane module. The stock solution supply pipe has an inlet into which the stock solution flows at one end, and the other end is closed,
The filtrate discharge pipe has a discharge port for discharging the filtrate at one end and is closed at the other end.
The filtration device according to claim 1 or 2, wherein the inflow port and the discharge port face the same direction.   The filtration device according to any one of claims 1 to 3, which satisfies a relationship of D1: D2 = 1 to 10: 1, where D1 is an inner diameter of the stock solution supply pipe and D2 is an inner diameter of the stock solution branch pipe. The stock solution supply pipe is disposed at a corresponding position between the first module row and the second module row,
5. The filtration according to claim 1, wherein the undiluted solution branch pipes are respectively connected on straight lines substantially parallel to the opposing direction of the first and second module rows in the undiluted solution supply pipe. apparatus. One concentrate discharge pipe extending along the direction in which the plurality of membrane modules are arranged in a line;
A plurality of concentrated liquid branch pipes communicating the primary side of each membrane module and the concentrated liquid discharge pipe;
The filtration apparatus as described in any one of Claims 1-5 provided with these.

Images