JPH08224450A - Device for stabilizing inflow water quantity for membrane module of membrane casing housing type - Google Patents

Abstract

PURPOSE: To provide a filter in which an organic hollow fiber membrane such as a superfiltration MF membrane and an ultrafiltration membrane and an inorganic multilumen type membrane are used in a casing housing method. CONSTITUTION: In a casing housing method in which a hollow yarn permeation membrane such an organic super filtration membrane and a ultrafiltration membrane and inorganic multilumen type membrane are put in a case and used, in front of the section of a membrane module, that is, between a membrane case 2 and inflow piping 3, a propeller-shaped rotor 6 is fitted, or in the central part between the membrane case 2 and the inflow piping 3, a disc-shaped baffle plate is fitted. In the execution of this method, as the installation place of the rotor 6 and the inflow piping 3, the inside of a reducing size fitting 5 is selected when the membrane case 2 and the inflow piping 3 are connected by the reducing size fitting 5, and the region in front of the membrane module is selected when the membrane case 2 of the membrane module and the inflow piping 3 are integrated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION This invention relates to microfiltration (MF).
The present invention relates to a filtration device that uses a membrane, an organic hollow fiber membrane such as an ultrafiltration (UF) membrane, and an inorganic multilumen membrane in a casing storage system.

[0002]

2. Description of the Related Art Conventionally, many internal pressure type and external pressure type filtration devices using hollow fiber type permeable membranes are small in size and have a small difference between the cross sectional diameter of the hollow fiber membrane module and the inlet pipe diameter. It was being done. Membrane module cross-sectional diameter: If the ratio of the raw water inflow pipe diameter is small, the membrane case a and the inflow pipe b are attached to the membrane cross section in the form of a rod-shaped tapered different diameter joint (hereinafter referred to as I flange) c. The impinging flow velocity is almost uniform (Fig. 14).

By the way, with the recent increase in size of membrane filtration devices,
The number of hollow fibers per module has increased, and the ratio of the cross-sectional diameter of the membrane module to the diameter of the inflow pipe has become large. In this case, the inflow portion into the membrane case a is a funnel-shaped I-flange b, and it is necessary to lengthen it in proportion to the pipe diameter ratio in order to make the flow velocity that collides with the membrane cross section uniform. However, in order to make the apparatus as a whole compact, it is necessary to increase the funnel-shaped angle and use the distance between the cross-section of the membrane casing and the inflow pipe b as short as possible (FIG. 15). .

In particular, when an internal pressure type filtration device having the inside of the hollow fiber membrane as the filtration surface is used for water treatment, etc., the flow velocity of the fluid colliding with the central portion of the membrane cross section is high, and the flow velocity colliding with the outside is slow. Become. That is, the flow velocity in the hollow fiber at the central portion of the membrane module and the flow velocity in the hollow fiber at the outer portion are different, and the entire membrane cannot be used efficiently.

In such a case, if the vehicle is operated for a long time,
Backflow cleaning and flushing cleaning cannot be performed evenly over time, and blockage due to biological propagation may occur gradually in the outer portion on the cross section of the membrane module. From the above, the time required to chemically clean the membrane is shortened. Further, even in chemical cleaning, since the inside of the film is not uniformly soiled, uneven cleaning occurs and the life of the entire film is shortened.

As a method for making the flow velocity distribution of an apparatus using an I-flange, that is, a joint having a different diameter, a method of making an actual flat plate 5-606.
Japanese Patent Laid-Open No. 04-2004 discloses that guide vanes are radially arranged in the different diameter joint. However, in the case where such a guide vane is used, it is necessary to dispose the flow so as to be distributed to the outer guide vanes near the inflow port.

[0007]

SUMMARY OF THE INVENTION Here, according to the present invention, even if the distance between the membrane cross section and the inflow pipe is short, the flow velocity of the fluid colliding with the membrane cross section is always constant, so that the entire membrane can be efficiently made. It is intended to provide a device that can be used.

[0008]

That is, according to the present invention, a hollow fiber type permeable membrane such as an organic microfiltration membrane and an ultrafiltration membrane and an inorganic multilumen membrane are used in a case. In the casing storage system, a propeller-like rotor is attached to the front of the cross section of the membrane module, that is, between the membrane case and the inflow pipe, or a disc-like shape is provided in the central portion between the membrane case and the inflow pipe. In the case of connecting the baffle plate of and the rotor or baffle plate at the time of implementation, when the membrane case and the inflow pipe are connected by the different diameter joint, the inside of the different diameter joint, and the membrane. If the membrane case of the module and the inflow pipe are integrated structure, it is located in front of the membrane module, and the inflow water stabilizing device for the membrane module of the membrane casing storage system is proposed. To do.

[0009]

The rotor or baffle can be installed at the front of the membrane module cross section by dispersing the fast flow in the central portion of the membrane cross section so that the flow velocity impinging on the membrane cross section can be kept uniform at all times. The rotor or baffle plate has the effect of making the flow velocity uniform inside the entire hollow fiber or multilumen. Further, the outer side of the membrane cross section is prevented from being blocked, the entire membrane surface is utilized uniformly, and the entire membrane module can be used efficiently.

FIG. 1 shows the membrane casing of the membrane casing module 1.
FIG. 2 is a view showing a case 2 and an inflow pipe 3 into the membrane case 2, in which the inflow pipe 3 and the membrane case 2 are connected by an I-flange 4 having a different diameter cross section, that is, a funnel shape. In this embodiment, a rotor, that is, a fan 6 is mounted inside the membrane case 2 via a support 5 as appropriate.

Next, in FIG. 2, a rotor, that is, a fan 6 is mounted in the inflow pipe 3 via a support 5. FIG. 3 shows the membrane case 2 of the membrane casing module 1.
The inflow pipe 3 and the inflow pipe 3 are integrally formed, and the rotor, that is, the fan 6 is mounted in front of the cross section of the membrane module.

The rotor or fan 6, as shown in FIGS. 4 and 5, is rotatably supported by the support 5 via a bearing 7.

FIG. 7 of the above-mentioned embodiment shows changes in the transmembrane pressure difference with respect to the duration of filtration between the case where the rotor is attached in front of the membrane cross section and the case where the rotor is not attached. Although there is no noticeable change at the beginning of water flow, the time required to reach the transmembrane pressure difference that requires chemical cleaning with the passage of the filtration time is changed by installing the rotor. The effect of making it longer was obtained. As a result, it is expected that the hollow fibers of the entire membrane module are efficiently used and the number of times of chemical cleaning is reduced to prolong the life of the membrane.

Next, in the embodiment shown in FIGS. 8 to 13, first, FIGS. 11 and 12 show a state in which the baffle plate 8 is attached to the I-flange 4 through the support 5. This baffle plate 8 is used for the inflow of the membrane casing 2 (FIG. 8) of the membrane casing module 1 in FIG. 8 to FIG. 10 corresponding to FIGS. Inside the pipe 3 (Fig. 9), in front of the membrane module cross section (Fig. 10)
It is attached to.

FIG. 13 of this embodiment shows changes in the transmembrane pressure difference with respect to the filtration duration time, with and without the baffle plate attached in front of the cross section of the membrane. Although there is no noticeable change at the beginning of water flow, the time required to reach the transmembrane pressure difference that requires chemical cleaning due to the transmembrane pressure difference change with the passage of filtration time is determined by installing a baffle plate. The effect of lengthening was obtained. As a result, the effect of prolonging the life of the membrane can be expected by efficiently utilizing the hollow fibers of the entire membrane module and reducing the number of times of chemical cleaning.

[0016]

The organic hollow fiber type permeable membrane casing has various hollow fibers and cases of varying thickness depending on the thickness of the casing. A thread film is attached. The operation of the membrane device is normal washing such as backwashing and flushing to prevent clogging of the membrane surface, but the transmembrane pressure rises gradually with the duration of filtration, and the transmembrane pressure rises. Causes a complete occlusion of the membrane surface when it reaches a certain level. In order to prevent this, it is necessary to perform cleaning with a chemical based on the value of the transmembrane pressure difference.For chemical cleaning, use a chemical that matches the operating conditions and the membrane material. Deterioration of the membrane material cannot be avoided with the number of chemical cleanings. Therefore, according to the present invention,
By effectively utilizing the entire membrane contained in the membrane case, the effect of extending the period of time required for chemical cleaning compared to the conventional method of using the membrane is to extend the life of the membrane and This is effective in achieving a reduction in running cost.

[Brief description of drawings]

FIG. 1 is a diagram showing one mode of use of an embodiment of the device of the present invention.

FIG. 2 is a diagram showing another mode of use of an embodiment of the device of the present invention.

FIG. 3 is a diagram showing still another mode of use of an embodiment of the device of the present invention.

FIG. 4 is a plan view showing a manner of mounting the rotor in the above embodiment.

5 is a cross-sectional view of the portion shown in FIG.

FIG. 6 is an enlarged detailed cross-sectional view of a portion of FIG.

FIG. 7 is a graph showing a difference in filtration continuation time depending on the presence or absence of a rotor.

FIG. 8 is a view of a usage pattern corresponding to FIG. 1 in another embodiment of the present invention.

FIG. 9 is a view of a usage pattern corresponding to FIG. 2 in the other embodiment of the present invention.

[FIG. 10] FIG. 3 in the other embodiment of the present invention.
It is a figure of the type of usage corresponding to.

FIG. 11 is a view showing a manner of mounting the baffle plate in the another embodiment of the present invention.

12 is a cross-sectional view of the portion shown in FIG.

FIG. 13 is a graph showing a difference in filtration continuation time depending on the presence or absence of a baffle plate.

FIG. 14 is a view of a conventional module having a small diameter.

FIG. 15 is a diagram of a recent module having a large diameter.

[Explanation of symbols]

 1 Casing Module 2 Membrane Case 3 Inflow Piping 5 Different Diameter Joint (I Flange) 6 Rotor (Huan) 8 Baffle Plate

Claims (6)

[Claims] 1. A hollow fiber permeable membrane such as an organic microfiltration membrane or an ultrafiltration membrane, and an inorganic multilumen membrane.
In the case housing method used by putting it in a case, the case of the case housing method having a structure in which a propeller-like rotor is attached in front of the cross section of the membrane module, that is, between the membrane case and the inflow pipe. Inflow water stabilizing device for membrane module. 2. When the membrane case of the membrane module and the inflow pipe are connected by a different diameter joint, the rotor is installed at the inside of the membrane case or of the different diameter joint for connection. The membrane casing-accommodating membrane module according to claim 1, which is an interior.
Stabilizer for inflow water. 3. The membrane case according to claim 1, wherein in the case where the membrane case of the membrane module and the inflow pipe are integrally structured, the rotor is attached to the front of the cross section of the membrane module. Thing storage type inflow water stabilization device for membrane module. 4. A membrane in a casing storage system in which a hollow fiber type permeable membrane such as an organic microfiltration membrane or an ultrafiltration membrane and an inorganic multilumen membrane are used in a case. Membrane casing storage type inflow water stabilizing device with a disc-shaped baffle attached to the front of the module cross section, that is, the central portion between the membrane case and the inflow pipe. . 5. When the membrane case of the membrane module and the inflow pipe are connected by a different-diameter joint, the baffle plate is installed inside the membrane case or inside the different-diameter joint for connection. And
The inflow water stabilizing device for a membrane module of the membrane casing storage system according to claim 4. 6. The membrane case according to claim 4, wherein when the membrane case of the membrane module and the inflow pipe have an integral structure, the baffle plate is attached to the front of the cross section of the membrane module. Thing storage type inflow water stabilization device for membrane module.