JP3400638B2 - Filtration device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filtration device for filtering a liquid containing impurities using a filtration module in which a large number of hollow fiber membranes are bundled, and more particularly to a filtration device having a function of cleaning the filtration module.

[0002]

2. Description of the Related Art When a large amount of a liquid containing impurities is filtered by using a filtration module, the impurities adhere to the surface of the hollow fiber, which deteriorates the filtration performance of the filtration module. At this time, if the hollow fibers are washed to remove impurities from the surface, the filtration performance of the filtration module is restored.

In a filtration device using a filtration module, bubbles are supplied from below the filtration module to shake the hollow fibers for scrubbing.

If the amount of bubbles supplied to the filtration module is too small, the cleaning effect is low, and if the amount is too large, the hollow fiber is damaged and the life is shortened. In addition, if the liquid to be purified is uniformly supplied during filtration and bubbles are evenly supplied during scrubbing, the filtration performance of each filtration module will be uniform, and the life of each filtration module can be averaged. The time until the module is replaced can be lengthened, and the purification can be performed efficiently.

The prior art of a filtration device using a filtration module for scrubbing is described in JP-A-61-222509.

[0006]

DISCLOSURE OF INVENTION Problems to be Solved by the Invention In the filtration device described in JP-A-61-222509, during scrubbing,
Compressed gas is supplied to the space from the partition plate that partitions the lower part of the container to the lower end of the cylinder provided in the partition plate.
However, a layer of gas and liquid is created in this space, and the liquid in the space passes through the inside of the cylinder and is connected to the liquid above the partition plate, so by adjusting the pressure of the gas, It is difficult to adjust the generation amount and the ejection force. In addition, the liquid level is not stable due to the movement of gas and liquid in the space, and in addition, the number of small holes or the size of the slits provided on the side surface of the cylinder varies depending on the position of the liquid level, and thus bubbles generated The amount of is not constant. Therefore, it is not possible to uniformly supply air bubbles to each filtration module.

In order to generate air bubbles from the small holes, the liquid level must always be above the lower end of the cylinder, so it is necessary to lengthen the cylinder. Therefore, the lower part of the partition plate becomes larger and the filtration becomes smaller. The equipment container is large.

An object of the present invention is to provide a filtration device which can supply a uniform amount of bubbles to each filtration module, can efficiently wash the filtration module, and is compact. is there.

[0009]

In order to achieve the above-mentioned object, the feature of the filtration device according to claim 1 is that a flat plate having a plurality of holes is provided under the filtration module, and gas is supplied into the container. The supply pipe has gas pressure adjusting means and is connected to the container under the flat plate.

According to the above feature, the gas is supplied by the gas supply pipe to the space surrounded by the flat plate and the lower lid. The supplied gas becomes bubbles from a plurality of holes of the flat plate and flows out to the cylindrical body, shakes the filtration module, and removes impurities adhering to the hollow fiber membrane. At this time, if the gas pressure adjusting means keeps the pressure of the gas in the space constant, it is possible to uniformly supply a constant amount of bubbles to each filtration module.

Further, by changing the pressure of the gas in the space surrounded by the flat plate and the lower part of the container by the gas pressure adjusting means, the amount of bubbles generated can be changed, and the size of the shaking of the filtration module can be changed. Therefore, the filtration module can be efficiently washed according to the impurities adhering to the hollow fiber membrane.

Also, regardless of the volume of the gas chamber,
Since the amount of bubbles generated can be adjusted, the gas chamber can be made smaller and the filter device can be made smaller.

A feature of the filtering device according to the present invention is that a protrusion is provided on the flat plate, the projection being longer than the distance between the lower end of the filtration module and the flat plate and shorter than the flat plate.

According to the above feature, the same action as that of the filtering device according to the first aspect can be obtained, and the protrusion provided on the flat plate suppresses the shaking of the filtering module.
The filtration module can be prevented from being damaged, and bubbles are uniformly supplied by the filtration module.

A feature of the filtering device according to claim 3 is that a gas chamber is provided under the filtration module, a gas supply pipe having a gas pressure adjusting means is connected to the gas chamber, and a plurality of second holes are formed on a curved surface. The cylinder has a first hole on the outer surface of the gas chamber.

According to the above feature, the gas supplied to the gas chamber by the gas supply pipe enters the cylinder through the second hole, becomes bubbles from the first hole, and exits to the cylinder body to shake the filtration module. . It is possible to obtain the same action as in Example 1, and the separated impurities pass through the periphery of the first hole and the gas chamber to settle in the lower portion of the container, and the second hole is clogged with the separated impurities. As a result, it is possible to uniformly supply a constant amount of bubbles to each filtration module.

According to a fourth aspect of the present invention, there is provided a feature of the filtration device, wherein a projection longer than a distance between a lower end of the filtration module and an outer surface of the air chamber facing the filtration module and shorter than the filtration module is the air chamber. On the outer surface facing the filtration module.

According to the above feature, the same action as that of the filtering device according to the third aspect can be obtained, and the protrusion provided on the outer surface of the air chamber facing the filtering module prevents the filtering module from swaying significantly. Therefore, the filtration module can be prevented from being damaged, and the bubbles are uniformly supplied to the filtration module.

[0019]

DETAILED DESCRIPTION OF THE INVENTION

(Embodiment 1) FIG. 1 shows a filtration device 100 according to a first embodiment of the present invention.

FIG. 1 is a vertical sectional view of the filtration device 100.
Tower upper part 2a and bottom part 2 of filtration container 2 of filtration device 100
c is a mirror structure, and the body 2b is a cylindrical body. The inside of the filtration container 2 is divided into three spaces by a separating plate 6 and a flat plate 10, and a purification liquid chamber 3 surrounded by the separating plate 6 and the tower upper part 2a of the filtering container 2 is filtered between the separating plate 6 and the flat plate 10. The chamber 4 and the air chamber 5 surrounded by the flat plate 10 and the bottom portion 2 c of the filtration container 2 are configured.

A water purification pipe 20 for flowing the filtered liquid to the outside is connected to the tower upper portion 2a of the filtration container 2.

A filtration module 7 is suspended from a separator 6 in the filtration chamber 4. The filtration module 7 is composed of a hollow fiber membrane 8 in which hollow fibers are bundled and a module cylinder 9 that surrounds and protects the hollow fiber membrane 8, and only a water pipe inside the hollow fiber communicates with the purification liquid chamber 3.

The body 2b of the filtration container 2 is provided with a water supply pipe 21 for supplying unpurified liquid and an exhaust pipe 23 for exhausting air accumulated in the upper part of the filtration chamber 4, and a drain pipe 24 in the lower part. Is provided.

A baffle plate 2 for dispersing the supplied unpurified liquid around the connection between the body portion 2b of the filtration container 2 and the water supply pipe 21.
Two are provided.

An air supply pipe 25 for supplying air and a drain pipe 26 for discharging the liquid in the air chamber 5 are connected to the bottom portion 2c of the filtration container 2.

The flat plate 10 has ventilation holes 11 of the same size under each filtration module 7, and the air chamber 5 communicates with the filtration chamber 4 through the ventilation holes 11. Around the ventilation hole 11 on the side of the filtration module 7 of the flat plate 10, a module rocking preventive rod 12 for preventing the filtration module 7 from significantly shaking is provided. FIG. 2 shows the arrangement of the module rocking preventive rod 12.

The clean water pipe 20, the water supply pipe 21, the exhaust pipe 23, and the drain pipe 24 are provided with a valve 30, a valve 31, a valve 33, and a valve 34, respectively. A pressure adjusting device 35 that adjusts the air pressure is installed in the air supply pipe 25.

During the filtration operation, the valves 33 and 34
And the valve 36 is closed, the pressure regulator 35 stops the supply of air and the valves 30 and 31 are opened. The liquid to be purified is dispersed from the water supply pipe 21 to the baffle plate 22 and flows into the filtration chamber 4. The purification liquid in which the impurities are filtered by the hollow fiber membrane 8 enters the purification liquid chamber and flows out from the water purification pipe 20.

When a large amount of impurities are trapped in the hollow fiber membranes 8 during the filtration operation, the filtration function of the hollow fiber membranes 8 deteriorates.
In order to restore the filtration function of the hollow fiber membrane 8, the filtration module 7 is shaken with air to perform scrubbing to remove impurities.

After the filtration operation is completed, the valves 30 and 31 are closed to stop the supply of the liquid to be purified and the outflow of the liquid to be purified. The pressure adjusting device 35 supplies air to the air chamber 5 through the air supply pipe 25. At this time, the valve 36 is opened to discharge the liquid to be purified accumulated in the air chamber 5 from the drain pipe 26, the valve 36 is closed again, and the valve 33 of the exhaust pipe 23 is opened. The air that has flowed into the air chamber 5 is the vent hole 1 of the flat plate 10.
Air bubbles form 1 and are evenly supplied to each filtration module 7. The bubbles shake the hollow fiber membrane 8 to remove the trapped impurities. The air supplied to the filtration module 7 exits from the hole provided in the upper part of the module cylinder 9, collects in the upper part of the purified liquid chamber 3, and is exhausted from the exhaust pipe 23.

At this time, if the pressure inside the air chamber 5 is kept constant by the pressure adjusting device 35, the size of each vent hole 11 is the same, so that an appropriate constant amount of bubbles is supplied to each filtration module 7. Can be supplied evenly.

Further, since the module shake-preventing rods 12 prevent the filtration modules 7 from shaking significantly and being displaced from the ventilation holes 11, air bubbles can be evenly supplied to the respective filtration modules 7, and the adjacent filtration modules 7 can be provided.
Can be prevented from colliding with. Further, by changing the pressure of the air chamber 5 with the pressure adjusting device 35, the amount of bubbles generated in each ventilation hole 11 can be changed, so that the hollow fiber membrane 8 can be changed.
Appropriate scrubbing may be performed according to the state of impurities adhering to. For example, if the pressure of the air chamber 5 is increased before discarding the filtration module 7, the amount of bubbles supplied to the filtration module 7 increases, and the shaking of the hollow fiber membrane 8 can be increased to improve the cleaning efficiency.

According to the filtration device 100 of this embodiment, a certain amount of bubbles can be evenly supplied to each filtration module 7.

Further, since the amount of bubbles supplied to each filtration module 7 can be changed, the filtration module 7 can be efficiently washed.

Further, even if the height of the air chamber 5 is low, a certain amount of bubbles can be uniformly supplied to each filtration module 7, so that the filtration device 100 can be downsized.

(Embodiment 2) A filtration device 200 according to a second embodiment of the present invention will be described.

FIG. 3 is a vertical sectional view of the filtration device 200 of this embodiment, and FIG. 4 is a view taken along the line BB of FIG. Filtration device 20
The filter container 2 of No. 0 has the same shape as that of the first embodiment, but the inside of the filter container 2 is divided into two spaces by the partition plate 6, and the cleaning liquid chamber 3 and the partition plate 6 above the partition plate 6 are separated. The lower filtration chamber 4 is configured. In this embodiment, the air chamber 201 is provided below the filtration module 7 in the filtration chamber 4.

An outer shape of the air chamber 201 is formed by an upper flat plate 202, a lower flat plate 203 and a side plate 204. Inside, a plurality of through cylinders 205 connect the upper flat plate 202 and the lower flat plate 203, and the internal space of the through cylinder 205 is A hole 210 is formed through the upper flat plate 202 and the lower flat plate 203. The through cylinder 205 is arranged so that a hole 210 is provided below each filtration module 7. Through cylinder 20
Vent holes 211 are provided on the curved surface of No. 5.

The air supply pipe 25 is connected to the air chamber 201,
It is supported by the support plate 206 of the body portion 2b. A pressure adjusting device 35 that adjusts the air pressure is installed in the air supply pipe 25. Similar to the first embodiment, the water purification pipe 20 is connected to the tower upper portion 2a of the filtration container 2 and the exhaust pipe 23 is connected to the body portion 2b. The water purification pipe 20 and the exhaust pipe 23 are respectively provided with a valve 30 and a valve 33.
Is provided.

At the bottom 2c of the filtration container 2, a water supply / drainage pipe 27 is provided.
Are connected. The water supply / drain pipe 27 includes a water supply pipe 21 and a drain pipe 2.
6 is connected, and the water supply pipe 21 has a valve 31 and a drain pipe 26.
The valve 36 is provided in the valve 33. During the filtration operation, the valve 33 and the valve 36 are closed, and the pressure adjusting device 35
Stops the air supply and valves 30 and 31 are opened. The liquid to be purified passes from the water supply pipe 21 through the water supply / drainage pipe 27, around the air chamber 201 and through the holes 210, and passes through the filtration chamber 4
And is purified in the same manner as in the first embodiment.

After the filtration operation is completed, the valves 30 and 31 are closed to stop the supply of the liquid to be purified and the outflow of the liquid to be purified, and the scrubbing operation is performed. Pressure regulator 35
Supplies air to the air chamber 201 through the air supply pipe 25. At this time, the valve 33 of the exhaust pipe 23 is opened to discharge the air accumulated in the upper part of the filtration chamber 4. The air supplied to the air chamber 201 becomes bubbles in the ventilation holes 211, and
05, each module is evenly supplied to the cylinder 14,
After that, scrubbing is performed as in the first embodiment.

The impurities peeled off from the hollow fiber membrane 8 settle around the air chamber 201 and through the through cylinder 205 at the bottom of the filtration chamber 4, but the ventilation holes 211 are present in the curved surface of the through cylinder 205 and are caused by the impurities. Since it is not clogged, a constant amount of air bubbles can always be uniformly supplied to each filtration module 7.

As in the first embodiment, if the pressure inside the air chamber 201 is kept constant by the pressure adjusting device 35, the ventilation hole 2
Since the size of 11 is the same, an appropriate fixed amount of bubbles can be uniformly supplied to each filtration module 7. Further, by changing the pressure of the air chamber 201 with the pressure adjusting device 35, the amount of bubbles generated in the ventilation hole 211 can be changed, so that the filtration module 7 can be efficiently washed.

Further, the filtration module shake-preventing rod 12 can supply air bubbles to each of the filtration modules 7 more uniformly as in the first embodiment, and can prevent the air bubbles from colliding with the adjacent filtration modules 7.

After the air supply is stopped and the scrubbing is completed, the valve 36 is opened and the impurities peeled from the hollow fiber membrane 8 are discharged from the water supply / drain pipe 27 together with the liquid to be purified.

According to the filtration device 200 of this embodiment, as in the case of the first embodiment, it is possible to uniformly supply a constant amount of bubbles to each filtration module 7.

Further, since the amount of bubbles supplied to each filtration module 7 can be changed, the filtration module 7 can be efficiently washed.

Further, even if the height of the air chamber 201 is low, a constant amount of bubbles can be evenly supplied to each filtration module 7, so that the bottom of the filtration container 2 can be made small and the filtration device 100 can be made compact. it can.

[0049]

According to the filtration device of claim 1, a flat plate having a plurality of holes is provided under the filtration module, and the gas supply pipe for supplying gas to the container has gas pressure adjusting means, By being connected to the container under the flat plate, it is possible to uniformly supply a constant amount of bubbles to each filtration module.

Further, by changing the pressure of the gas in the space surrounded by the flat plate and the lower part of the container by the gas pressure adjusting means, the fluctuation of the filtration module can be changed, so that the filtration module can be cleaned efficiently. it can.

Further, regardless of the volume of the gas chamber,
Since the amount of gas supplied can be adjusted, the filter device can be downsized.

According to the filtering device of claim 2, the same operational effect as that of the filtering device of claim 1 can be obtained, and since the projections provided on the flat plate prevent the filtering module from shaking significantly, Can be prevented from being damaged, and air bubbles can be uniformly supplied by the filtration module.

According to the filtering apparatus of the third aspect, the gas chamber is provided below the filtration module, the gas supply pipe having the gas pressure adjusting means is connected to the gas chamber, and the plurality of second curved surfaces are provided on the curved surface.
By forming the first hole on the outer surface of the gas chamber, the cylinder having the hole can obtain the same function and effect as those of the first embodiment, and the second hole is clogged with impurities that are peeled off. Since this can be prevented, it is possible to uniformly supply a constant amount of bubbles to each filtration module.

According to the filtration device of claim 4, the same operation and effect as those of the filtration device of claim 2 can be obtained, and the projection provided on the outer surface of the air chamber facing the filtration module is Since the shake is suppressed to a great extent, damage to the filtration module can be prevented and bubbles are uniformly supplied to the filtration module.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a filtration device 1 according to a first embodiment.

FIG. 2 is a view on arrow AA of FIG.

FIG. 3 is a vertical sectional view of a filtration device 200 according to a second embodiment.

FIG. 4 is a view taken along the line BB of FIG.

[Explanation of symbols]

100, 200 ... Filtration device, 2 ... Filtration container, 2a ... Tower upper part, 2b ... Body part, 2c ... Bottom part, 3 ... Purification liquid chamber, 4 ... Filtration chamber, 5,201 ... Air chamber, 6 ... Separator plate, 7 ... filtration module, 8 ... hollow fiber membrane, 9 ... module cylinder, 10 ... flat plate,
11, 211 ... Ventilation holes, 12 ... Module rocker bars,
20 ... Clean water pipe, 21 ... Water supply pipe, 22 ... Baffle plate, 23 ...
Exhaust pipe, 24, 26 ... Drain pipe, 25 ... Air supply pipe, 27 ... Water supply / drain pipe, 30, 31, 33, 34, 36 ... Valve, 35
... pressure adjusting device, 202 ... upper flat plate, 203 ... lower flat plate, 204 ... side plate, 205 ... through cylinder, 206 ... support plate,
210 ... hole.

Front page continuation (72) Inventor Ken Abe 3-1-1, Saiwaicho, Hitachi, Ibaraki Hitachi Ltd. Hitachi factory (72) Inventor Michio Murase 7-2, Omika-cho, Hitachi, Ibaraki Company Hitachi, Ltd. Electric Power & Electric Machinery Development Headquarters (72) Inventor Kiyoshi Fujimoto 7-2 Omika-cho, Hitachi City, Ibaraki Prefecture Hitachi, Ltd. Electric Power & Electric Machinery Development Headquarters (72) Inventor Taketoshi Kurita Benten, Hitachi City, Ibaraki Prefecture 3-10-2 Machi, Hiritsu Kyowa Kogyo Co., Ltd. (56) References JP 61-50605 (JP, A) JP 2-83020 (JP, A) JP 1-107807 (JP, A) (58) Fields surveyed (Int.Cl. ⁷ , DB name) B01D 63/04 B01D 65/02 520

Claims (4)

(57) [Claims] 1. A filtering device comprising a container having a cylindrical body having a mirror structure at an upper part and a lower part thereof, and a plurality of filtration modules installed in the container, wherein a flat plate is provided in the container below the filtration module. The flat plate has a plurality of holes, and a gas supply pipe for supplying gas into the container is connected to the container under the flat plate, and the gas supply pipe has a gas pressure adjusting means. Filtration device. 2. The filtration device according to claim 1, wherein a protrusion that is longer than the distance between the lower end of the filtration module and the flat plate and is shorter than the filtration module is provided on the flat plate. 3. A filter device comprising a container having a cylindrical structure having an upper portion and a lower portion of a cylindrical body, and a plurality of filtration modules installed in the container, wherein a gas chamber is provided below the filtration module, and a gas chamber is provided. A gas supply pipe for supplying is connected to the gas chamber, the gas supply pipe has a gas pressure adjusting means, and the gas chamber has a plurality of cylinders forming a first hole on an outer surface of the gas chamber. The filtration device, wherein the cylinder has a second hole in a curved surface. 4. A distance longer than the distance between the lower end of the filtration module and the outer surface facing the filtration module, and
4. The filtration device according to claim 3, wherein a protrusion shorter than the filtration module is provided on the outer surface facing the filtration module.