JP3349015B2 - 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 apparatus for filtering a liquid to be purified by passing a liquid to be purified through a plurality of filtration modules, and more particularly to a method for cleaning a filtration module with a simple structure. It relates to a suitable filtration device.

[0002]

2. Description of the Related Art In a filtration apparatus for filtering a liquid to be purified, if the filtration performance of the filtration module is reduced by long-time purification, the module is washed and reused. In a filtration device using a hollow fiber membrane module, a gas such as air is introduced from below the hollow fiber membrane module, and the hollow fiber is shaken and washed.
At this time, if the gas flow rate supplied to each hollow fiber membrane module is too small, the cleaning effect is reduced, and if the gas flow rate is too large, the life of the hollow fiber is reduced, so that gas is uniformly supplied to each hollow fiber membrane module. There is a need to.

A typical example of a conventional filtration device using a hollow fiber membrane module is disclosed in Japanese Patent Application Laid-Open No. Sho 61-222509. This publicly known technique is applied to each hollow fiber membrane module.
A partition plate having an outlet for the liquid to be purified is provided immediately below the partition plate, and a vertically open cylinder is connected to an outlet on the lower side of the partition plate. A plurality of small holes are provided in the side wall of the cylinder in the length direction. During washing , compressed gas supplied from an air supply pipe below the partition plate is stored in a layer below the partition plate and then supplied to each hollow fiber membrane module through a small hole in the cylinder and an outlet of the partition plate. It is.

[0004] As a different type, Japanese Patent Application Laid-Open No.
No. 2770 is disclosed. According to this known technique, an air supply pipe is arranged for each row of hollow fiber membrane modules without providing a partition plate or a water passage cylinder as in the above-described example, and the air supply pipe is provided immediately below each hollow fiber membrane module. Make a small hole in the air supply pipe,
Through these small holes, air is directly supplied to each hollow fiber membrane module.

[0005]

However, the above-mentioned known technology has the following problems.

That is, in the technique of Japanese Patent Application Laid-Open No. 61-222509, the cylinder connected to the partition plate is used for both the flow of the liquid to be purified during the cleaning operation and the supply of air during the cleaning. Since air supply to each hollow fiber membrane module by this method is finally performed by buoyancy, one hollow fiber membrane module requires one cylinder immediately below the hollow fiber membrane module. A large number of cylinders are attached to. In addition, at the time of air supply, the interior of the cylinder becomes a gas-liquid two-phase and the flow becomes unstable, and the hydrostatic head for air supply is reduced, so that the cylinder needs to be lengthened, thereby increasing the equipment cost.

In the technique disclosed in Japanese Patent Publication No. 4-62770, an air supply pipe is provided for each row of hollow fiber membrane modules. For this reason, the internal volume of the container increases, and the structure for removing the air supply pipe at the time of inspecting the bottom of the container becomes complicated.

An object of the present invention is to provide a plurality of hollow fiber membrane modules.
It is an object of the present invention to provide a simple and inexpensive filtration device which can supply a liquid to be purified during cleaning and a gas during cleaning.

[0009]

SUMMARY OF THE INVENTION The above objects of the present invention are as follows.
A container, a separator in the container, a plurality of filtration modules connected to the separator, a water supply pipe for supplying a liquid to be purified into the container, and an air supply pipe for supplying gas; In a filtration device for purifying the liquid to be purified by passing the purified liquid through the filtration module, a partition plate for forming a layer of supply gas is formed below the water supply pipe below the filtration module and the partition plate. The partition plate is provided substantially horizontally above the air supply pipe, and a ventilation hole is provided in the partition plate immediately below the filter module, and a water passage for communicating the liquid to be purified above the partition plate is provided. This is achieved by providing the air vent separately from the vent.

[0010] The water passage section may be disposed on a partition plate between the vent holes so as not to include the vent hole, or may be formed in a gap with a container by opening an outer peripheral portion of the partition plate. .

[0011] Further, the water passage section is characterized in that a water passage pipe whose upper and lower sides are opened and whose upper end is connected to the partition plate is arranged between the plurality of vent holes.

A plurality of the ventilation holes are arranged in a zigzag pattern on the plane of the partition plate, and the upper end of the water pipe is disposed at the center of a triangle having three adjacent ventilation holes as vertices. And

[0013] The present invention is characterized in that upper ends of ventilation pipes having different lengths are connected to the plurality of ventilation holes, respectively.

[0014] Further, a support plate which is inscribed in the container and has an opening smaller than the outer periphery of the partition plate and which detachably supports the partition plate is provided, and a drain pipe having an upper end connected to the support plate. Is provided.

[0015] Further, an air supply outflow pipe having an outlet above a connection portion between the container and the air supply pipe is provided to be connected to the air supply pipe, and the opening is formed below the partition plate at the time of washing. It is characterized in that it is opened at the opening.

[0016]

As described above, in the construction of the present invention, the partition plate is provided substantially horizontally (horizontally so that the gas layer becomes substantially uniform) below the lower end of the filtration module in the container. A ventilation hole is provided directly below each filter module of the partition plate corresponding to the partition plate. Further, a water passage for passing the liquid to be purified upward from below the partition plate is arranged independently of the vent hole. The water passage section is constituted by a plurality of water pipes connected to the upper end to an opening provided between the plurality of ventilation holes of the partition plate, or as a configuration that opens between the outer peripheral portion of the partition plate and the container,
A water passage independent of the vent can be realized.

At the time of washing the filtration module, the gas supplied from the air supply pipe connected to the container forms a gas layer below the partition plate, and passes through the ventilation holes provided in the partition plate to each filter module. Inflow. At this time, the gas that has exited from the ventilation hole flows into the filtration module due to the buoyancy in the water above the partition plate, so that air can be supplied by providing the ventilation hole immediately below the filtration module as in the present invention. Become. On the other hand, the water supply section for supplying the liquid to be purified at the time of purification does not need to be directly below the filtration module or one-to-one with the filtration module. And an independent configuration becomes possible.

According to the present invention, the degree of freedom in designing the water passage section is increased, the number of water passage pipes can be reduced, and a structure without a water passage pipe in the partition plate can be realized. The structure is simplified, and downsizing and equipment cost can be reduced.

The inside of the water passage is always a single liquid phase,
Since the flow is stable and the hydrostatic head for air supply is large, the water flow section can be shortened.

In addition, a plurality of ventilation holes are provided immediately below each filtration module, and ventilation pipes having different lengths are connected to the ventilation holes. As a result, when increasing the air supply flow rate,
Although the gas layer formed in the part except the water passage part below the partition plate becomes thicker, the gas flows in order from the shorter one, so the number of gas pipes through which the gas flows increases, and the gas layer thickness becomes sharp. Increase can be suppressed. As a result, even when the air supply flow rate is large, the water passage section can be shortened.

Further, by providing a support plate of a partition plate inscribed in the container and having an opening smaller than the outer periphery of the partition plate, and providing a drain pipe which is opened up and down and has an upper end connected to the support plate, the inspection of the bottom of the container can be performed. The partition plate can be easily removed, and the liquid and impurities accumulated on the support plate can be easily drained from the drain pipe.

Further, by providing an air supply outflow pipe having an opening above a connection portion between the container and the air supply pipe, a gas layer formed in a portion having a small air supply flow rate and excluding a water passage below the partition plate. Even when the thickness is small, the opening of the air supply / outflow pipe is not exposed in the gas layer and does not disturb the liquid level, so that the air supply to each filtration module can be stabilized and equalized.

Further, by providing an air supply distribution pipe having a plurality of openings in the container connected to the air supply pipe, the thickness of the gas layer formed below the partition plate is made uniform, and each filtration module is provided. The amount of air supply to the air can be equalized.

[0024]

Embodiments of the present invention will be described below in detail with reference to the drawings. The same parts are denoted by the same reference numerals throughout the drawings.

A first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a longitudinal sectional view of a filtration device according to a first embodiment, FIG. 2 is a view taken along the line AA in FIG. 1, and FIG. 3 is a partial detailed view of a horizontal plate.

The filtering device comprises a container 11, a hollow fiber membrane 13 having a filtering function and disposed in the container 11, and a module cylinder 1.
4, a separator 12 for supporting the hollow fiber membrane module, and a vent 21 and a water pipe 22 disposed below the lower end of the hollow fiber membrane module. Partition plate 20 and water supply pipe 15 for supplying liquid to be purified
A gas supply pipe 16 for supplying the gas when cleaning the hollow fiber membrane 13, an outflow pipe 17 connected to the upper part of the container 11, an exhaust pipe 18 connected below the separator 12, It has a drain pipe 19 connected to the lower part.

In the filtration apparatus of the present embodiment, during a normal purification operation, the liquid to be purified flows in from the water supply pipe 15, passes through the water pipe 22 connected to the partition plate 20, and passes through each module cylinder 14.
After the impurities such as the clad are filtered by the hollow fiber membrane 13, they flow out of the outflow pipe 17. When impurities are trapped in the hollow fiber membrane 13 by such a filtration operation and the filtration function of the hollow fiber membrane 13 is reduced, the supply of the liquid to be purified is stopped, and gas (usually air) is distributed to the air supply pipe 16 and the air supply dispersion. Feed through tube 30. At this time, the inside of the container below the separator 12 is full.

The supplied gas forms a gas layer 24 below the partition plate 20 in the container 11 except for the water pipe 22, and the gas flowing out from the vent hole 21 of the partition plate 20 has a buoyancy in the liquid to be purified. Then, the gas flows into the module cylinder 14 immediately above, and the trapped impurities are released by shaking the hollow fiber membrane 13 by the flow of gas, and after the washing is completed, the impurities are discharged from the drain pipe 19 together with the liquid to be purified. The gas supplied to each filter module flows out of a hole provided in the upper part of the cylinder 14 in the module, and is exhausted from the exhaust pipe 18. Module tube 14
If the flow rate of the gas flowing into the filter is too small, the cleaning effect of the hollow fiber membrane 13 is weakened, and if it is too large, the life of the hollow fiber membrane 13 is shortened. is there.

The partition plate 20 is provided with a vent hole 21 immediately below the module tube 14, and a water passage pipe 22 is provided between the plurality of vent holes 21 (three vent holes in this embodiment). The upper ends are connected to form a water passage section. An air supply distribution pipe 30 having a plurality of air supply holes 31 is connected to the air supply pipe 16.

During a normal purifying operation, the liquid to be purified flows from the water supply pipe 15 and flows into each module cylinder 14 through the water pipe 22 connected to the partition plate 20, but the water pipe 22 has a vent hole. Since it is independent of the module 21, there is no need to provide a water pipe 22 for each module cylinder 14. As in this embodiment, for example, one water pipe 22 is sufficient for three module cylinders 14, and the number of water pipes 22 can be reduced. For example, container 1
When the diameter of 1 is about 1.5m, the diameter of the water pipe is 10cm
The diameter of the vent hole 21 is about 1 cm, and it can be seen that the effect of the reduction of the water pipe is great.

Further, since the ventilation hole and the water pipe are independent of each other, the degree of freedom in design is increased. Usually, in order to increase the occupancy in the horizontal section and reduce the size of the container 11, the filtration modules are arranged in a triangular lattice (or staggered).
In this case, as shown in the drawing, one water pipe is disposed at the center of a triangle (dotted line) formed with the three module tubes 14 as vertices. The liquid to be purified that has passed through the water pipe 22 is dispersed and supplied to the three surrounding module cylinders 14. Since the water pipe 22 and each module cylinder 14 are arranged at the shortest and equidistant distance, the liquid to be purified is There is an advantage that the components are evenly distributed to each module and the disturbance of water in the container can be prevented.

By the way, in the steady state at the time of cleaning , the total amount of air supplied from the air supply pipe 16 and the total amount of air passing through the vent hole 21 are balanced by the relationship of the following equation (1). Becomes

[0033]

Ρ · g · H = １ ／ · ζ · ρg · Vg ² where ζ: resistance coefficient of the vent hole 21, ρg: gas density, ρ: fluid density of the water passage 23, g : Gravity acceleration, V
g: Outflow velocity of gas from the vent hole 21. From this, Vg during cleaning is

[0034]

(Vg) ² = (2 / ζ) · (ρ / ρg) · g · H

In the above-mentioned prior art, since the water pipe has the ventilation hole, the inside of the water pipe becomes a gas-liquid two-phase, and the fluid density ρ decreases. However, in this embodiment, the inside of the water pipe 22 is a single liquid phase, and the fluid density ρ is the density of the liquid. As a result, the thickness H of the gas layer 24 for obtaining the same outflow velocity Vg can be reduced, and the water pipe can be shortened accordingly.

Further, the gas is dispersed and supplied by an air supply distribution pipe 30 having a plurality of air supply holes 31, the thickness distribution of the gas layer 24 is made uniform, and the amount of air supplied to each module cylinder 14 is reduced. It can be made uniform. The air supply hole 31 is provided mainly on the side surface of the air supply distribution pipe 30 so that the clad does not enter, but on the lower surface near the tip for drainage after the start of air supply, and on the upper surface for exhaust after the air supply ends. Is also provided.

As described above, according to the filtering device of the present embodiment, the ventilation hole 21 of the partition plate 20 and the water passage 22 can be provided independently, so that the number of water passages 22 can be reduced and the number of passages can be reduced. Since the inside of the water pipe 22 has a single liquid phase, the water pipe 22 can be shortened, and the economic efficiency can be improved.

FIG. 4 is a partially detailed view of a filtering device according to a modification of the first embodiment. This modified example is different from the first embodiment in that a plurality of ventilation holes 21a, 21b,
21c, and ventilation pipes 27b and 27c of different lengths are connected to the ventilation holes 21b and 21c, respectively.
b and 21c have different lengths.

Generally, the amount of air supply during the cleaning of the hollow fiber membrane is constant. However, for example, when it becomes necessary to greatly increase the amount of supplied air, as is apparent from (Equation 1), the gas layer 24
Increases rapidly in proportion to the square of the air supply amount. In this modification, when the amount of air supply is greatly increased and the thickness of the gas layer 24 is increased, the number of vent holes for supplying gas is increased to 21a, 2
It increases sequentially like 1b and 21c. For this reason, an increase in the thickness of the gas layer 24 can be suppressed, and the water pipe 22 can be shortened even when the supplied air amount changes significantly.

Next, a second embodiment of the present invention will be described with reference to FIGS.
This will be described below.

FIG. 5 is a longitudinal sectional view of a filtration device according to a second embodiment of the present invention, FIG. 6 is a view taken in the direction of arrows AA in FIG. 5, and FIG. 7 is a partial detailed view of a partition plate.

The present embodiment differs from the first embodiment in that the air supply distribution pipe 30 of the first embodiment is not provided, and a plurality of air supply pipes 16 are connected to the container 11 instead.
In addition, one water pipe 22 is provided for one module cylinder 14. This is a preferred but not necessary condition.

At the time of cleaning the hollow fiber membrane 13, a plurality of air supply pipes 1
The gas dispersed and supplied from 6 forms a gas layer 24 below the partition plate 20, and is supplied to each module cylinder 14 through the vent hole 21.

The feature of this embodiment is that when the number of water pipes 22 is large and there is difficulty in arranging the air supply distribution pipe 30,
The thickness distribution of the gas layer 24 is made uniform, and each module cylinder 14
This is effective for equalizing the amount of air supplied to the pump. When the number of the water pipes 22 is increased, the flow velocity in the pipes can be reduced.

FIG. 8 is a horizontal sectional view of a filtering device according to a modification of the second embodiment viewed from below, FIG. 9 is a partial longitudinal sectional view thereof, and FIG. 10 is a partial longitudinal sectional view of another position thereof. is there.

In the present modification, a first point different from the second embodiment is that a support plate 125 for supporting the partition plate 20 is provided.
That is, the drain tube 126 is provided on the support plate 125. The partition plate 20 and the support plate 125 are locked by fastening means (not shown). The second point is that the outlet 13 is located at a position where the opening of the air supply pipe 16 is higher than the connection between the air supply pipe 16 and the container 11.
3 is provided. Note that the first point and the second point do not require any other conditions.

By separating the support plate 125 connected to the container 11 from the partition plate 20, the partition plate 20 can be easily removed when inspecting the bottom of the container 11. In this case, liquid and impurities accumulate on the support plate 125 between the container 11 and the partition plate 20, but can be drained by the drain pipe 126 connected to the support plate 125, and the length of the drain pipe 126 is By making the length the same, gas does not flow out when the hollow fiber membrane is washed.

In the second embodiment (FIG. 7),
When the air supply amount is small and the thickness of the air layer 24 becomes thin and the water surface becomes higher than the air supply pipe 16, the liquid surface is disturbed by the air supply, and the air flow amount from the air holes 21 fluctuates. In this modification, as shown in FIG. 9, the air supply / outflow pipe 132 is bent upward and the position of the outlet 133 at the tip thereof is higher than the position of connection with the air supply pipe 16, so that the air supply amount is small. Even if the thickness of the air layer 24 becomes thin, the air can be supplied stably without changing the amount of air flow from the air holes 21.

FIG. 11 is a partial longitudinal sectional view according to another modification of the second embodiment, and corresponds to FIG.

This modification is different from the modification of FIG. 9 in that the upward end of the air supply / outflow pipe 132 is closed, and an outlet 134 is provided at the center of the container 11 on the pipe wall near the end. is there. According to this, the outlet 13 of the air supply outflow pipe 132
Since the gas flows out horizontally from 4 and spreads easily below the partition plate 20, the thickness distribution of the gas layer can be made uniform and the gas can be supplied to each module cylinder 14 evenly.

Next, a third embodiment of the present invention will be described with reference to FIGS. FIG. 12 is a longitudinal sectional view of a filtration device according to a third embodiment, FIG. 13 is a view taken along the line AA of FIG.
4 is a partial detailed view of the partition plate.

This embodiment is different from the first and second embodiments in that the water pipe 2 provided in the partition plate 20 is different from the first embodiment.
2 is that a water passage portion 220 is formed between the outer peripheral plate 201 provided downward on the outer edge portion of the partition plate 20 and the container 11.

In this embodiment, since a large number of water pipes provided on the partition plate 20 are not provided, the structure becomes extremely simple, the equipment cost can be reduced, and the size can be reduced. However, since a lateral flow toward the center of the container 11 is generated after exiting the water passage section 220, the fluid force to the module cylinder 14 is increased, so that the processing flow rate of the liquid to be purified is restricted.

Further, in this embodiment, a plurality (two in the figure) of the air supply pipes 16 are provided, and the air supply distribution pipe 230 connected to the air supply pipe 16 has a header shape. As shown in the figure, the header portion of the air supply distribution pipe 230 is formed in an arc shape inside the outer peripheral plate 201, and a plurality of air supply holes 231 are provided. Since there is no obstacle such as a water pipe, the gas dispersed and supplied from the large number of air supply holes forms a gas layer 24 having a uniform thickness distribution at the lower portion of the partition plate 20, Module tube 14
Supplied to According to this configuration, inspection of the lower part of the container is also facilitated.

As described above, the first embodiment to the third embodiment of the present invention employ different shapes of the water passage section and the air supply section, but it is obvious that any combination thereof may be used.

[0056]

According to the present invention, a horizontal partition plate is provided below the lower end of the hollow fiber membrane module in the container, and a vent hole is formed in the partition plate in one-to-one correspondence with the hollow fiber membrane module. Is established,
Since the water passage that communicates from the lower part to the upper part of the partition plate is provided independently of this vent hole, the degree of freedom of design is increased, and the number of water pipes provided between the vent holes at the lower part of the partition plate can be reduced. In addition, a water passage can be formed at the peripheral edge of the partition plate by eliminating the water passage pipe, which has the effect of simplifying the structure of the filtration device, reducing its size, and reducing equipment costs.

Further, by setting the position of the opening of the supply air outlet pipe connected to the air supply pipe higher than the connection position between the air supply pipe and the container, the liquid level can be reduced even when the air supply amount is small and the thickness of the gas layer is thin. The gas can be supplied without disturbing the gas, or the gas can be supplied by dispersing the gas through an air supply distribution pipe, the thickness distribution of the gas layer is made uniform, the air supply amount to each hollow fiber membrane module is made uniform, and the filtration is performed. The cleaning ability of the device can be improved.

[0058]

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a filtration device according to a first embodiment of the present invention.

FIG. 2 is a horizontal sectional view of the filtration device according to the first embodiment of the present invention.

FIG. 3 is a partial detailed view of a partition plate according to the first embodiment of the present invention.

FIG. 4 is a partial detailed view of a modification of the first embodiment.

FIG. 5 is a longitudinal sectional view of a filtration device according to a second embodiment of the present invention.

FIG. 6 is a horizontal sectional view of a filtration device according to a second embodiment of the present invention.

FIG. 7 is a partial detailed view of a partition plate according to a second embodiment of the present invention.

FIG. 8 is a horizontal sectional view of a modification of the second embodiment.

FIG. 9 is a partial longitudinal sectional view according to a modification of the second embodiment.

FIG. 10 is a partial longitudinal sectional view of another position according to a modification of the second embodiment.

FIG. 11 is a partial longitudinal sectional view according to another modified example of the second embodiment.

FIG. 12 is a longitudinal sectional view of a filtration device according to a third embodiment of the present invention.

FIG. 13 is a horizontal sectional view of a filtration device according to a third embodiment of the present invention.

FIG. 14 is a partial detailed view of a partition plate according to a third embodiment of the present invention.

[Explanation of symbols]

11: container, 13: hollow fiber membrane, 14: module cylinder, 1
5 ... water supply pipe, 16 ... air supply pipe, 20 ... partition plate, 21 ... vent hole, 22 ... water pipe, 23 ... opening, 24 ... gas layer, 27 ...
Ventilation pipe, 30 ... air supply distribution pipe, 31 ... air supply hole, 125 ... support plate, 126 ... drain pipe, 132 ... air supply outflow pipe, 133
... outlet, 134 ... outlet, 201 ... outer peripheral plate, 220 ... water supply part, 230 ... air supply distribution pipe, 231 ... air supply hole.

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Masato Kobayashi 3-1-1, Sachimachi, Hitachi-shi, Ibaraki Pref. Hitachi, Ltd. Hitachi Plant (72) Inventor Seiichi Kazama 3-1-1 Sachimachi, Hitachi-shi, Ibaraki No. 1 Hitachi, Ltd. Hitachi Plant (56) References JP-A-61-293504 (JP, A) (58) Field surveyed (Int. Cl. ⁷ , DB name) B01D 61/00-65/10 C02F 1/44

Claims (10)

(57) [Claims] 1. A container, a separator in the container, a plurality of filtration modules connected to the separator, a water supply pipe for supplying a liquid to be purified and an air supply pipe for supplying gas to the container. In the filtering device for purifying the liquid to be purified by passing the liquid to be purified through the filtration module, a gap is provided below the module cylinder of the filtration module through a gap.
The partition plate is provided substantially horizontally , and the partition plate is provided with the water supply.
Pipe and a supply gas layer provided above the air supply pipe.
And a ventilation hole is provided in the partition plate immediately below the filter module corresponding to the filtration module , and a water passage through which the liquid to be purified passes above the partition plate is separated from the ventilation hole. A filtration device characterized by being provided. 2. A container, a separator in the container, a plurality of filtration modules connected to the separator, a water supply pipe for supplying a liquid to be purified to the container, and an air supply pipe for supplying gas. In the filtering device for purifying the liquid to be purified by passing the liquid to be purified through the filtration module, a gap is provided below the module cylinder of the filtration module through a gap.
The partition plate is provided substantially horizontally , and the partition plate is provided with the water supply.
Pipe and a supply gas layer provided above the air supply pipe.
And a ventilation hole is provided in the partition plate immediately below the filter module corresponding to the filtration module ,
Filtration device, characterized in that the water passing portion communicating the liquid above the partition plate is provided in front Symbol partition plate so as not to include the vent. 3. A container, a separator in the container, a plurality of filtration modules connected to the separator, a water supply pipe for supplying a liquid to be purified to the container, and an air supply pipe for supplying gas. In the filtering device for purifying the liquid to be purified by passing the liquid to be purified through the filtration module, a gap is provided below the module cylinder of the filtration module through a gap.
The partition plate is provided substantially horizontally , and the partition plate is provided with the water supply.
Pipe and a supply gas layer provided above the air supply pipe.
To allow the formation, said plurality of filtration modules - with a plurality of vent holes corresponding to each of the le, characterized in that the water passing portion arranged so as not to include ventilation holes provided in the partition plate filtration apparatus. 4. The filtering device according to claim 1, wherein the water-passing portion connects an upper end of a water-passing pipe to an opening provided between the plurality of ventilation holes of the partition plate. Characteristic filtration device. 5. The filtering device according to claim 4, wherein the plurality of ventilation holes are arranged in a staggered or triangular lattice on the plane of the partition plate, and the center of a triangle having three adjacent ventilation holes as vertices. A filtration device, wherein the water pipe is arranged in a part. 6. A container, a separator in the container, a plurality of filtration modules connected to the separator, a water supply pipe for supplying a liquid to be purified and an air supply pipe for supplying gas to the container. In the filtering device for purifying the liquid to be purified by passing the liquid to be purified through the filtration module, a gap is provided below the module cylinder of the filtration module through a gap.
The partition plate is provided substantially horizontally , and the partition plate is provided with the water supply.
Pipe and a supply gas layer provided above the air supply pipe.
The partition plate immediately below the filter module is provided with a vent hole corresponding to the filter module, and the purifying is performed between the outer peripheral portion extending downward at the edge of the partition plate and the container. A filtration device, wherein a water-passing portion for passing a liquid above the partition plate is formed. 7. A container, a separator in the container, a plurality of filtration modules connected to the separator, a water supply pipe for supplying a liquid to be purified and an air supply pipe for supplying gas to the container. In the filtering device for purifying the liquid to be purified by passing the liquid to be purified through the filtration module, a gap is provided below the module cylinder of the filtration module through a gap.
The partition plate is provided substantially horizontally , and the partition plate is provided with the water supply.
Pipe and a supply gas layer provided above the air supply pipe.
A ventilation hole is provided in the partition plate directly below the filter module in correspondence with the filter module, and provided between the outer peripheral portion provided at the outer edge of the partition plate and extending downward from the partition plate and the container. A filter for passing the liquid to be purified above the partition plate. 8. The filter device according to claim 1, further comprising a supply air outlet pipe connected to the air supply pipe and having an outlet above a connection between the container and the air supply pipe. Characteristic filtration device. 9. The filtering device according to claim 8, wherein the outlet of the air supply / outflow pipe opens to a gas layer formed below the partition plate during cleaning. 10. The filtering device according to claim 1, wherein two air supply pipes are provided and arranged at two locations facing each other in a circumferential direction of the container. .