JPH04180821A - Hollow yarn film filtration device - Google Patents

Abstract

PURPOSE:To obtain an energy-saving hollow yarn film filtration device with the high cleaning effects on an external pressure-type hollow yarn by supporting the hollow yarn of a hollow yarn film module in a horizontal direction, and at the same time, providing an air diffusion device and/or a water spray device which clean hollow yarn. CONSTITUTION:At least, one or more hollow yarn modules consisting of hollow yarns 18 and a water collection part 17 connected to the hollow yarns 18 are arranged in a tank 15. The hollow yarns 18 of the hollow yarn module 2 are supported horizontally, and at the same time, an air diffusion device and/or a water spray device for cleaning the hollow yarns 18 are arranged. As a result, it is possible to obtain a hollow yarn film filtration device capable of cleaning an external pressure-type hollow yarn efficiently and securing an adequate quantity of processing water in saved space with energy-saving function.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a hollow fiber for filtering suspended matter contained in liquids such as river water, lake water, well water, human waste, sewage, industrial water, and wastewater. The present invention relates to a membrane filtration device, particularly a hollow fiber membrane filtration device having a structure that allows effective cleaning of hollow fibers.

[Conventional technology]

The pore diameter of a membrane generally called a precision filtration membrane is 0.01
J-~number-. Hollow fiber membrane filtration having these pore sizes includes an external pressure type that filters liquid from the outside to the inside of the membrane, and an internal pressure type that is the opposite. For the external pressure type, after filtration for 0.5 to 2 hours,
Cleaning using air for several minutes or treated water cleaning is performed by passing treated water from the inside of the membrane to the outside.

In addition, in conventional hollow fiber membrane modules, in order to reduce space, the hollow fibers are arranged closely, the number of hollow fibers is increased, and the membrane area is increased to ensure the amount of water treated per module.

[Problem to be solved by the invention]

In the conventional external pressure type hollow fiber membrane Modineal, the hollow fibers are densely arranged, so if SS etc. gets inside the module, it will peel off from the module with the normal cleaning method using air.
It is difficult to remove and the flux degrades within a few weeks. If the number of hollow fibers per module is reduced and arranged sparsely in order to improve cleaning performance, the number of modules will increase significantly to secure the required amount of treated water.

Therefore, in the usual method of arranging modules, as the number of modules increases, the installation area increases and the amount of air for cleaning increases. One possible way to secure membrane area without increasing the number of modules is to increase the length of the hollow fibers, but due to the pressure loss inside the hollow fibers, only the hollow fibers near the water collection area function, so do not make them too long. That makes no sense.

Therefore, an object of the present invention is to provide a hollow fiber membrane filtration device that saves energy, has a high external pressure type hollow fiber cleaning effect, and can secure the amount of water to be treated in a small space. This is an attempt to expand the uses of external pressure type hollow fiber membranes, which had previously been used.

[Failure to solve the problem]

The present invention is described in (1) to (2) below, and can thereby solve the above problems.

(1) In a hollow fiber membrane filtration device including at least one or more hollow fiber membrane modules each having a plurality of hollow fibers and a water collection portion communicating with the hollow fibers in a tank, the hollow fibers of the hollow fiber membrane module are A hollow fiber membrane filtration device characterized in that it supports the hollow fibers in a horizontal direction and is equipped with an aeration device and/or a water sprinkler device for cleaning the hollow fibers.

(2) In a hollow fiber membrane filtration device including at least one or more hollow fiber membrane modules each having a plurality of hollow fibers and a water collection portion communicating with the hollow fibers in a tank, the hollow fibers of the hollow fiber membrane modules are horizontally disposed. A hollow fiber membrane characterized in that the member is arranged so as to support in the direction or perpendicular direction and to move a part or all of the hollow fibers of each module by moving the member from outside the device and cleaning it. Filtration device.

By arranging the hollow fiber membrane module as described above, the present invention can efficiently clean the hollow fibers and/or prevent contamination.

Here, the term "hollow fiber" refers to a single hollow fiber membrane having an end communicating with at least one water collection part, and even if the other end is free, the other end is connected to the same water collection part from the folded part. It may also be connected to another water collection area.

The invention described in (1) above (hereinafter referred to as invention (1)) will be explained below.

In the present invention (1), hollow fibers are supported in the horizontal direction. Here, supporting in the horizontal direction literally means that the hollow fiber will not become horizontal unless one end that is not held at the end of the water collection part or the folded part hangs in the direction of gravity and the entire hollow fiber does not become vertical. This may include a state where the hollow fiber is tilted close to horizontal, or where the central portion of the hollow fiber is slightly downwardly tilted.

Specifically, the hollow fibers are held by inserting a support such as a rod between the folded portions of the hollow fibers, and the hollow fibers are connected to different water collecting portions by connecting both ends of the hollow fibers to different water collecting portions. For example, it may be arranged so as to be supported in the horizontal direction.

In addition, in the present invention (1), a hollow fiber membrane module may be used alone, but in particular, two or more hollow fiber membrane modules can be arranged vertically in multiple stages while maintaining the hollow fibers in the horizontal direction. It is preferable to configure a thread membrane filtration device,
The cleaning gas can be used more effectively in a more space-saving manner.

Conventionally known hollow fiber membrane modules can be used, and there are no particular restrictions on the shape of the water collection part, but preferably one with a reduced density of hollow fibers and gaps between the hollow fibers. Preferably, the hollow fiber membrane module has a hollow fiber folded portion with a rectangular end shape of the water collecting portion, and the hollow fiber has a plate-like shape as a whole. It is preferable that this hollow fiber membrane module is installed in a hollow fiber membrane filtration device so that the hollow fibers constituting the plate-like lower surface thereof are oriented horizontally.

These hollow fiber membrane modules may be installed in the hollow fiber membrane filtration device in any way as long as they satisfy the above conditions.
Preferably, the treated water collection section of the hollow fiber membrane filtration device and the water collection section of the hollow fiber membrane module are preferably provided on the side of the hollow fiber membrane filtration device. In this case, the method of disposing the hollow fiber membrane module water collection parts is not particularly limited and may be disposed on the same side of the hollow fiber membrane filtration device, alternately facing each other, or disposed randomly. However, it is preferable to position the hollow fiber membrane filtration device at a position such that when the hollow fiber membrane filtration device is cut along a vertical plane, the cut portions of the hollow fibers of different hollow fiber membrane modules are lined up at a predetermined interval in the direction perpendicular to the vertical plane.

Next, the hollow fiber membrane filtration device described in the above (2), which is the present invention (hereinafter referred to as the present invention (2)), will be explained.

This device uniformly moves some or all of the hollow fibers of each module of the hollow fiber membrane module installed by moving a member from outside the device (hereinafter referred to as cleaning). This feature is characterized by the fact that it is equipped with a

Here, uniformly moving the hollow fibers means that some or all of the hollow fibers of the hollow fiber membrane module are moved in response to the movement of the cleaning member. That is, the present invention cleans the hollow fibers by the interaction between the vibration of the hollow fibers themselves and the water flow.

The means for achieving the above-mentioned cleaning is not particularly limited and any known means can be applied. The cleaning member may be combined with the cleaning member.

In addition, the types of hollow fiber membrane modules that can be used are not limited, and the arrangement in the hollow fiber membrane filtration device is arbitrary, but the configuration of the cleaning member and the hollow fiber membrane module is as follows:
It is desirable to select a material for the cleaning member and to provide it so that the hollow fibers are not damaged by the cleaning member.

A preferred example of the configuration of the cleaning member is a configuration in which a hollow fiber support member used in the hollow fiber folded portion of the hollow fiber membrane Modineal is fixed in each module using, for example, a connecting rod.

There are no particular restrictions on the method of applying force to move the cleaning member.
It may be controlled mechanically or operated by a person.

In this case, it is sufficient for the cleaning member to have one application section, but it is also possible to use a plurality of application sections.

Further, the direction of movement of the cleaning member is not particularly limited, although one-dimensional reciprocating movement (up and down, left and right, etc.) is sufficient.

In addition, by supporting the hollow fibers of the hollow fiber membrane module horizontally or vertically, for example, cleaning the hollow fibers by moving the cleaning member connected to the hollow fiber supporting member in an appropriate direction can save space. for efficient cleaning. Also,
It can be used in combination with the bubbling cleaning type hollow fiber membrane filtration device described in (1) above.

General matters common to both inventions (1) and (2) will be described below.

The filtration method of the hollow fiber membrane module in the present invention is preferably an external pressure type, and the external pressure type means that the water to be treated outside the hollow fibers is connected to an iron membrane so that the filtrate reaches the inside of the hollow fibers through the hollow fiber membrane. It refers to a type in which a pressure difference is applied at the interface with water, and the means for creating the pressure difference is not particularly limited, and conventionally known means can be used.

Further, the material, hole size, etc. of the hollow fibers are arbitrary, and conventionally known ones can be used.

In addition, considering the pressure loss, the length of the hollow fiber is - For boat fishing, the length from the end of the water collection part to the folded part is 300~
600. mm is preferred.

Further, the hollow fiber membrane filtration device of the present invention can be applied to any device used as a solid-liquid separation means. for example,
A filtration section consisting of a hollow fiber membrane module can be installed in a biological treatment tank such as an aeration tank to have both filtration function and biological treatment function.If it also serves as aerobic biological treatment, it can be used to maintain aerobic conditions. In the case of the present invention (1), the air supply pipe can also be used for cleaning the hollow system. Present invention (2)
In this case, the air supply pipe may also be used as a cleaning means.

Further, when the biological treatment is anaerobic treatment, nitrogen component gas or the like can be used.

Further, hollow fiber cleaning can be performed by using a water stream when raw water is introduced, but water may also be supplied from a separate water discharge means.

Such gas and water supply means may be a means that serves both, and conventionally known devices can be used.

Furthermore, in order to further improve the cleaning effect, a configuration may be adopted in which particulate matter is present inside the device, and a means for cleaning the hollow fibers by bringing the particulate matter into contact with the hollow fibers by bubbling and/or water jets may be added. . In this case, an adsorbent that adsorbs permeable organic substances may be used as the particulate material.

In the hollow fiber membrane filtration apparatus of the present invention, the hollow fibers may be washed while the treatment continues or after the treatment is stopped. In particular, cleaning the inside of the hollow fibers is preferably carried out during this stop.

〔Example〕

Hereinafter, specific examples of the present invention will be described, but the present invention is not limited thereto.

Example 1 FIG. 1 is an example of an air cleaning system for a hollow fiber membrane filtration device.

The hollow fiber membrane filtration device 1 includes a raw water tank 15 and a treated water tank 16.
An air diffuser 3 is installed at the bottom of the raw water tank.

The hollow fiber membrane module 2 is connected to the water collecting section 17 to the treatment water tank side 16,
The hollow fibers are installed in multiple stages above the air diffuser, with the hollow fibers facing the raw water tank.

The structure of the hollow fiber membrane module is shown in FIG. 2.

The hollow fiber membrane module 2 is a one-end water collection type membrane module, and consists of a water collection part 17 and a hollow fiber 18 that connects both ends to the water collection part and has a hollow fiber folded part 19. Support rod 20 inserted into the yarn folded part
is supported horizontally.

Raw water is passed through a raw water tank 15 by a raw water pump 6 (gravity flow is acceptable if pressure is secured), filtered by a hollow fiber membrane module 2, passed through a treated water tank 16, and then flows out from a treated water pipe 10.

For cleaning, the raw water pump 6 is stopped and the exhaust valve 12 is opened.

Start the blower 5 and start air cleaning.

The cleaning air flows out uniformly from the air diffuser 3, and cleaning is performed sequentially from the lower module as the air bubbles rise. After cleaning with air for a certain period of time, the treated water is cleaned as necessary depending on the contamination status of the membrane surface. For cleaning the treated water, the drain valve 13 is opened and the cleaning pump 8 is started to flow the treated water from inside the hollow fibers to the outside.

The 88 minutes removed by air cleaning and treated water cleaning are discharged through the drain pipe 14.

The structure of the hollow fiber membrane filtration device shown in FIG. There are no restrictions on the direction of insertion.

An example of this is shown below, and although the illustrations are omitted except for the changed parts, FIG. 1 can be applied to the unillustrated parts.

For example, the hollow fiber membrane filtration device 21 shown in FIG. 3 is provided with treated water tanks 16 on both sides of the device, and the hollow fiber membrane modules supported in the horizontal direction shown in FIG. 2 are alternately treated from both sides. Shown when inserted into a water tank.

In addition, the hollow fiber membrane filtration device 22 shown in FIG. 4 is provided with treated water tanks 16 on both sides of the device, and a hollow fiber membrane module 23 of a water collecting type at both ends shown in FIG. 5 is installed in the treated water tank 16. Indicates when inserted.

The module 23 is of a type in which both ends of the hollow fibers 24 are connected to water collection parts 25 and 26, and as shown in FIG. It is sufficient to deploy the hollow fibers horizontally when deploying them.

Example 2 Next, a specific example using the cleaning member of the present invention (2) will be described.

The hollow fiber membrane filtration device 101 shown in FIG.
3 and a treated water tank 114, the hollow fiber membrane Modinyl 10
2, connect the water collecting part 116 to the treated water tank 114 side with the hollow fiber 117
Install vertically in multiple tiers with the raw water tank side facing the tank.

A cleaning member 103 is inserted into each of the hollow fiber membranes Modineal 102 as shown in FIG. The rod 120 is the shaft water sealing part 11
It is out of the tank from 5 onwards.

The flow of water during treatment is the same as in Example 1, and the raw water introduced from the raw water pump 104 is passed through the hollow fiber membrane module 102.
The treated water is obtained from the treated water tank 114 through the treated water pipe 108.

For cleaning, the connecting rod is moved up and down, the membrane is vibrated up and down, and suspended matter is removed by water flow. The drain valve 111 is periodically opened to drain the separated SS through the drain pipe 112.

Clean treated water as necessary. The treated water cleaning method is the same as described above, and is performed by pressurizing treated water into the hollow fibers using the cleaning pump 106.

The connecting rod may be moved up and down by human power or power. The intensity of the vertical movement can be adjusted depending on the degree of contamination of the membrane.

In the hollow fiber membrane filtration device 101, the hollow fiber membrane Modineal is of a type in which the hollow fibers are arranged horizontally and the water collection part is arranged vertically, but the present invention is not limited to this, and as shown in FIG. Alternatively, a hollow fiber membrane filtration device 121 may be used in which the hollow fiber membrane module 102 is arranged with the water collecting section 116 arranged in the horizontal direction and the hollow fibers 117 arranged in the vertical direction. Note that in Example 1, a water sprinkler may be provided and cleaning using a water stream may be used in combination, and in Example 2, an aeration device and/or a water sprinkler may be provided to use a combination of aeration and washing using a water stream.

〔Effect of the invention〕

The air cleaning type hollow fiber membrane filtration device according to the present invention has a small installation area and the air rising from the lower part cleans the module sequentially from the lower module to the upper module, so the amount of cleaning air can be small.

A hollow fiber membrane filtration device with movable cleaning members uses a single power source (
All modules can be moved up and down or left and right and cleaned by vibration and water flow, so no air source is required.

Moreover, it is movable during processing and there is no need to stop processing for cleaning.

[Brief explanation of the drawing]

Fig. 1 is a schematic cross-sectional view for explaining an example of an air cleaning type hollow fiber membrane filtration device, and Fig. 2 is a perspective view for explaining a single-end water collection type hollow fiber membrane module applied to Fig. 1. 3 and 4 are schematic cross-sectional views for explaining a modification of the air cleaning type hollow fiber membrane filtration device shown in FIG.
FIG. 5 is a perspective view for explaining a hollow membrane module of both-ends water collection type installed in the apparatus shown in FIG. 4, and FIG. 6 is a cross-sectional view showing an example of a hollow fiber membrane filtration device with movable cleaning member A schematic diagram, FIG. 7 is a perspective view showing the configuration of a cleaning member and a hollow fiber membrane module, and FIG. 8 is a diagram for explaining a modification of the cleaning member movable hollow fiber membrane filtration device shown in FIG. 6. It is a cross-sectional schematic diagram. 1: Hollow fiber membrane filtration device 2: Hollow fiber membrane module 3: Diffusion device 4: Air pipe 5 Niblower 6: Raw water pump 7: Raw water inflow pipe 8: Washing pump 9: Washing pipe 10:
Treated water pipe 11: Drain valve 12: Exhaust pipe 13:
Drain valve 14: Drain pipe 15: Raw water pipe
16: Treated water tank - 17: Water collection section 18
: Hollow fiber 19: Hollow fiber folded part 20: Support rod 21.
22: Hollow fiber membrane filtration device 23: Both ends water collection type hollow fiber membrane Modineal 24: Hollow fiber 25. 26: Water collection section 101: Hollow fiber membrane filtration device 102: Hollow fiber membrane module 103: Cleaning member 104: Raw water Pump 105:
Raw water inflow pipe 106: Washing pump 107: Washing pipe
108: Treated water pipe 109: Treated water valve 1
10: Washing valve 111: Drain valve 112: Drain pipe 113: Raw water tank 114: Treated water tank 115:
Shaft water sealing part 116: Water collecting part 117: Hollow fiber
118; Hollow fiber folded part 119: Support rod
120: Connecting rod 121: Hollow fiber membrane filtration device

Claims (2)

[Claims] (1) In a hollow fiber membrane filtration device comprising at least one or more hollow fiber membrane modules each having a plurality of hollow fibers and a water collection portion communicating with the hollow fibers in a tank, the hollow fibers of the hollow fiber membrane module are A hollow fiber membrane filtration device characterized in that it supports the hollow fibers in a horizontal direction and is equipped with an aeration device and/or a water sprinkler device for cleaning the hollow fibers. (2) In a hollow fiber membrane filtration device including at least one or more hollow fiber membrane modules each having a plurality of hollow fibers and a water collection portion communicating with the hollow fibers in a tank, the hollow fibers of the hollow fiber membrane modules are horizontally disposed. A hollow fiber membrane characterized in that the member is arranged so as to support in the direction or perpendicular direction and to move a part or all of the hollow fibers of each module by moving the member from outside the device and cleaning it. Filtration device.