JP2001190936A - Filtration equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a filtration equipment in which impurities released in a hollow fiber membrane filter module are discharged without confining the impurities therein to prevent reattachment. SOLUTION: A vertically long hollow fiber membrane filtration module 13 is arranged in a housing 1 provided with first and the second take-out ports 9 and 11 at an intake 5. A plurality of washing threads 15 provided with a number of floats 29 along the vertical direction suspended and supported within the hollow fiber membrane filter module 13. The washing threads 15 are bounded up and down, right and left, back and forth to expand the hollow fiber module 13 outwardly by blowing an air from the air blow off nozzle 33 together with a washing. Thereby, the released impurities inside are discharged outside.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a filtration device using a hollow fiber membrane filter.

[0002]

2. Description of the Related Art A hollow fiber membrane filter used in a filtration device has an infinite number of ultrafine pores of 0.03 .mu.m formed in a wall of a hollow fiber formed in a pipe shape as an internal passage. In the process of flowing the treated water toward the inside, impurities that cannot pass through the ultra-fine pores are blocked, so that filtration is performed.

[0003]

If impurities adhere to the surface of the hollow fiber membrane filter after use for a predetermined period of time, the filtration efficiency is reduced. Therefore, air is blown from the bottom together with the washing water to blow the hollow fiber membrane filter. The cleaning work is regularly performed to make the water flow, remove the adhered impurities, and drain the water to the outside.

However, as shown in FIG. 10, the initial pressure difference ΔP from the inlet 103 of the filtration device 101 to the filtered water outlet 105 increases as the number of times increases. The experimental data is shown in FIG.

[0005] Figure 11, black dots indicate the initial differential pressure after washing, white circles after a period of time operation, impurities adhere gradually differential pressure becomes successively higher, at 1.0 kg / cm ² values, This shows the start of cleaning when cleaning is started.

[0006] According to this figure, the value of the initial differential pressure increases as the number of times of cleaning increases, and finally the initial differential pressure (0.4%) is obtained by cleaning with a chemical (double circle).
kg / cm ² ).

[0007] The reason that the initial differential pressure increases sequentially as the number of times of cleaning increases is that the hollow fiber membrane filter has a module structure in which about 10,000 hollow fibers are bundled. Since it is bound by the bundled hollow fibers, it is difficult to go outside and re-adhesion occurs. It is believed that the above problems occur when they are stacked.

[0008] Therefore, an object of the present invention is to provide a filtration device that allows impurities separated in a hollow fiber membrane filter module to smoothly go out without being trapped.

[0009]

According to a first aspect of the present invention, there is provided an intake apparatus, comprising: an inlet;
A vertically long hollow fiber membrane filter module is arranged in a housing with a take-out port, and a plurality of washing yarns provided with a large number of floats along the vertical direction are suspended and supported in the hollow fiber membrane filter module. Meanwhile, an air blowing nozzle for blowing air upward is provided at the bottom in the housing.

[0010] Thus, impurities are prevented when the treated water from the inlet passes through the hollow fiber membrane filter, and the filtered water can be taken out, for example, from the first outlet.

On the other hand, in order to remove impurities adhering to the hollow fibers after the use for a predetermined period, the flushing water is fed from the inlet, and at the same time, the air is blown upward from the air blowing nozzle. At this time, the float rises due to the rising air or violently swings right and left and back and forth, causing the hollow fiber membrane filter to dance and remove impurities. At the same time, the movement of the float and the washing yarn pushes the hollow fiber outward, creating a large gap between the hollow fiber and the hollow fiber.As a result, the separated internal impurities flow out without being trapped, 2 is discharged to the outside together with washing water and air.

Therefore, reattachment of the impurities is suppressed to a small value, and the pressure can be restored to a predetermined initial pressure difference. According to the second aspect of the present invention, a vertically long hollow fiber membrane filter module is arranged in a housing having an inlet and first and second outlets, and the hollow fiber membrane filter module is disposed inside the housing. A vertically movable float is provided, and an air blowing nozzle for blowing air upward is provided at the bottom in the housing.

[0013] With this, impurities are prevented when the treated water from the inlet passes through the hollow fiber membrane filter, and the filtered water can be taken out from, for example, the first outlet. On the other hand, after use for a predetermined period, to remove impurities biased to the hollow fiber, at the same time as washing water is fed from the inlet,
Air is blown upward from the air blowing nozzle.
At this time, the hollow fiber membrane filter module violently dances with a large amount of air, and impurities adhering to the hollow fiber are separated. At the same time, the hollow fiber membrane filter is pushed outward by the vertical movement of the float, and a large space is created between the hollow fibers.As a result, the separated internal impurities flow out without being trapped, The water is discharged from the second outlet together with the washing water and the air. Therefore, the reattachment of the impurities is suppressed to a small value, and the pressure can be restored to the predetermined initial pressure difference.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a first embodiment of the present invention will be specifically described with reference to FIGS.

In FIG. 2, reference numeral 1 denotes a housing of the filtration device 3.

The housing 1 is provided with an inlet 5 and a drain port 7 for taking in treated water and washing water on the lower side, and first and second outlets 9 and 11 on the upper side.

A hollow fiber membrane filter module 13 and a plurality of cleaning threads 15 are provided in the housing 1.

As shown in FIGS. 3 and 4, the hollow fiber membrane filter module 13 is formed by folding up and down a lower part of a vertically thin hollow fiber 17 which is a passage inside, and bundling about 10,000 bundles by a potting portion 19, and a lower part thereof. It has a U-shaped module structure that is a free end.

In this case, as shown in FIG.
The upper and lower sides may be bundled together by a potting portion 19, and an I-shaped module structure for extracting filtered water from the central collecting pipe 21 may be used.

In the potting portion 19 of the hollow fiber membrane filter module 13, an independent filtered water extraction chamber 25 is formed in the upper part of the housing 1 by the filter module mounting plate 23.

The filtered water discharge chamber 25 is provided inside the housing body 27.
Are separated from each other in a watertight state, and
The first outlet 9 is provided, and the second outlet 11 is provided in an upper portion of the housing body 27.

The cleaning yarns 15 are arranged at a central portion and at four positions on the outer periphery, that is, at a total of five positions. When the hollow fibers 17 are bundled by the potting portion 19, they are suspended and supported by being bundled together.

As shown in FIG. 5, the cleaning yarns 15 are provided with floats 29 at predetermined intervals, and a weight 31 is provided at the lowermost portion. It is set longer than the other four places.

On the other hand, an air blowing nozzle 33 for blowing air upward is disposed at the bottom of the housing 1.

According to the filtering device 3 configured as described above, by sending the treated water from the inlet 5, impurities in the treated water are filtered by the hollow fiber membrane filter module 13, and the filtered water is collected by the first filter. Removed from exit 9.

On the other hand, in order to remove impurities adhering to the hollow fiber membrane filter module 13 after a certain period of use, washing water is fed from the inlet 5 and at the same time, air is blown upward from the air blowing nozzle 33 from below. Blow out.

At this time, as shown in FIG. 6, the air rises as air bubbles, and each float 29 rises or falls due to the action.
By violently swaying left and right and back and forth, the hollow fiber membrane filter module 13 is danced and impurities are removed. At the same time, the movement of the floats 29 and the cleaning thread 5 causes the hollow fiber 17 to be pushed outward and a large gap is created between the hollow fiber 17 and the hollow fiber 17. Hollow fiber membrane filter module 13
To the second outlet 1 together with washing water and air.
Exhausted from 1

Therefore, the reattachment of the impurities is suppressed to a small value, and the predetermined initial pressure difference can be recovered.

FIGS. 8 and 9 show a second embodiment.

That is, the hollow fiber membrane filter module 13
And a guide member 35 are provided.
A vertically movable float 37 is provided, which rises when a predetermined water pressure is applied from below and falls when the water pressure becomes weak.
The float 37 has the shape of a truncated cone and has a function of pushing and expanding the hollow fiber 17 outward when ascending.

Since the other components are the same as those of the first embodiment, the same reference numerals are given and the detailed description is omitted.

Therefore, according to the second embodiment, when removing impurities, cleaning water is fed from the intake port 5 and air is blown upward from the air blowing nozzle 33. At this time, as shown in FIG. 9, the air becomes bubbles and rises vigorously to raise the float 37. The movement of the float 37 pushes and expands the hollow fiber 17 and creates a large gap between the hollow fibers 17. As a result, as shown by an arrow, the separated internal impurities are bound together with the outward flow. Hollow fiber membrane filter module 13
To the second outlet 1 together with washing water and air.
Exhausted from 1

Therefore, no reattachment of impurities occurs,
It can be restored to a predetermined initial differential pressure.

In the second embodiment, the guide member 35 for moving the float 37 up and down is provided by the guide member 35 shown in FIG.
Type hollow fiber membrane filter module 13
Is used, the structure also serves as the water collecting pipe 21 at the center.

[0035]

As described above, according to the filtration device of the present invention, the impurities separated in the hollow fiber membrane filter module can be discharged outside without being trapped inside. For this reason, there is no re-adhesion, and it is possible to recover to a predetermined initial differential pressure.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a hollow fiber membrane filter module of a filtration device according to the present invention.

FIG. 2 is a schematic explanatory view of the entire filtering device.

FIG. 3 is an explanatory view showing a U-shaped module structure of a hollow fiber membrane filter module with one hollow fiber.

FIG. 4 is a perspective view of a main part in which hollow fibers are bound by a potting part.

FIG. 5 is an explanatory view of a cleaning thread provided with a float.

FIG. 6 is an operation explanatory view at the time of impurity removal.

FIG. 7 is an explanatory view of an I-type module structure of a hollow fiber membrane filter module.

FIG. 8 is an operation explanatory view showing a second embodiment in which a hollow fiber membrane filter is pushed and spread by a float.

FIG. 9 is an operation explanatory view showing a second embodiment in which a hollow fiber membrane filter is pushed and spread by a float.

FIG. 10 is a schematic explanatory diagram of the entire filtering device.

FIG. 11 is an explanatory diagram showing a relationship between the number of times of cleaning for removing impurities and a differential pressure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Housing 5 Inlet 9,11 Outlet 13 Hollow fiber membrane filter module 15 Cleaning thread 29 Float 33 Air blowing nozzle

Claims (2)

[Claims] 1. A vertically long hollow fiber membrane filter module is disposed in a housing having an inlet and first and second outlets, and a plurality of hollow fiber membrane filter modules are vertically arranged in the hollow fiber membrane filter module. A plurality of washing threads provided with the floats are suspended and supported, and an air blowing nozzle for blowing air upward is provided at the bottom in the housing. 2. A vertically long hollow fiber membrane filter module is disposed in a housing having an inlet and first and second outlets, and a vertically movable float is provided in the hollow fiber membrane filter module. An air blowing nozzle for blowing air upward at a bottom portion in the housing while providing the filtering device.