JPH05285351A - Filter membrane module - Google Patents

Abstract

PURPOSE:To enable the uniform flow of upward currents at a sufficient velocity of flow and the sure washing of the entire part of the membrane surfaces of filter membrane modules by forming the spacing between the adjacent filter membrane modules to the width which decreases gradually from the bottom side toward the top side and is uniform in the transverse direction of the filter membrane modules. CONSTITUTION:The filter plate of the filter membrane module 11 provided with the filter membranes 15 to cover the surfaces of the filter plate 12 is so formed that its thickness decreases gradually from the top side toward the bottom side. A recessed part 13 is formed on the surface of the filter plate 12 and a spacer 14 interposed between the filter plate 12 and the filter membrane 15 is disposed within the recessed part 13. The filter membranes 15 are so provided that the entire part of the film surfaces is a flat surface. Namely, the spacing A between the adjacent filter membrane modules 11 the width of which decreases gradually from the bottom side toward the top side and is uniform in the transverse direction of the filter membrane modules 11 is formed so that the upward currents flow uniformly at the sufficient velocity of flow and the entire surface of the membrane surfaces of the filter membrane modules is surely washed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filtration membrane module of a membrane separation device used in a water treatment device or the like.

[0002]

2. Description of the Related Art Conventionally, a membrane separation device used in a water treatment device has a plurality of filtration membrane modules. For example, in the filtration membrane module 1 as shown in FIG.
An organic filtration membrane 3 such as an ultrafiltration membrane or a microfiltration membrane is adhered and fixed to the front and back sides of a filter plate 2 made of vinyl chloride or the like at the peripheral edge, and a wire mesh is provided between the organic filtration membrane 3 and the filter plate 2. The spacer 4 formed of the same was used.

Further, as shown in FIG. 3, in the membrane separation apparatus, a plurality of filtration membrane modules 1 are arranged in parallel with an appropriate gap 5, and a casing 6 of the membrane separation apparatus has a filtration membrane module 1 therein. Was formed with a plurality of groove portions 7 for inserting.

Then, a negative pressure is applied through the permeated liquid suction port 8 to suck and filter the water to be treated in the tank through the organic filtration membrane 3, and the cake layer adhered to the membrane surface is separated by the upward flow through the gap 5. I was cleaning.

[0005]

However, according to the above-mentioned conventional structure, since the spacer 4 is arranged between the organic filter membrane 3 and the filter plate 2, the spacers 4 are formed between the filter membrane modules 1. The gap 5 formed becomes large in the peripheral portion where the spacer 4 does not exist and becomes narrow between the adjacent spacers 4. For this reason, the upward flow that flows between the filtration membrane modules 1 along the membrane surface is caused by the gaps 5 on both sides having a large flow passage cross section.
a in a concentrated manner, and as shown in FIG. 4, in particular, as it goes to the upper side of the filtration membrane module 1, it escapes into the gap 5a having a larger flow passage cross section on the side portion, so that the membrane surface cleaning effect due to the upward flow is exerted. There was a problem that the cake layer could not be removed in the upper region 1a of the filtration membrane module 1 because it was not uniformly applied to the entire surface. As a result, there is a problem that a thick cake layer is formed on the membrane surface of the upper region 1a of the filtration membrane module 1 and the permeation flux of the membrane is reduced.

The present invention is intended to solve the above problems, and an object of the present invention is to provide a filtration membrane module in which an upward flow can uniformly flow between adjacent membrane surfaces.

[0007]

In order to solve the above problems, the present invention is directed to a filtration membrane module in which a filtration membrane is provided so as to cover the surface of the filtration plate, and the thickness of the filtration plate is directed from the top side to the bottom side. The configuration is such that it gradually decreases.

Further, a recess is formed on the surface of the filter plate, and a spacer interposed between the filter plate and the filter membrane is arranged in the recess so that the filter membrane is entirely flat. The configuration is provided in.

[0009]

With the above structure, a plurality of filtration membrane modules are arranged in parallel with an appropriate gap therebetween, and when the water to be treated is suction-filtered through the filtration membrane, it passes through the gap between the adjacent filtration membrane modules. The countercurrent gives a shearing force to the cake layer adhering to the film surface, and the cake layer is washed off.

At this time, the gap between the adjacent filtration membrane modules is wide on the lower side of the filtration membrane module,
It becomes narrower on the upper side. Therefore, the upward flow velocity through the gap is weakened by the contact with the cake layer as it flows upward along the membrane surface of the filtration membrane module, but the flow passage cross-sectional area decreases toward the upper side of the filtration membrane module. As a result, the cake layer can be sufficiently sheared over the entire membrane surface when flowing from the bottom side to the top side of the filtration membrane module.

Further, since the spacer is built in the concave portion of the filter plate so that the entire membrane surface of the filter membrane is a flat surface, in the width direction of the filter membrane module, the filter membrane modules adjacent to each other are separated from each other. The gap generated between them has a uniform width. Therefore, the upward flow passing through the gap does not deviate to both sides of the filtration membrane module as in the conventional case, and is always a uniform flow in the width direction when flowing from the bottom side to the top side of the filtration membrane module.

Therefore, since the gap is gradually narrowed from the bottom side to the top side of the filtration membrane module and is uniform in the width direction of the filtration membrane module, the entire membrane surface of the filtration membrane module is caused by the upward flow. Can be thoroughly washed.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A filtration membrane module according to an embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, the filtration membrane module 11 has a filter plate 12 made of vinyl chloride or the like, and the filter plate 12 is formed so that its thickness gradually decreases from the top side to the bottom side. .. In addition, concave portions 13 are formed on both side surfaces of the filter plate 12, and the concave portions 13
A spacer 14 made of a wire mesh or the like is arranged so as to fit in the space.

Further, an organic filtration membrane 15 is provided so as to cover the filter plate 12 and the spacer 14, and the organic filtration membrane 15 is stretched so that the whole becomes a flat surface. Furthermore, the filter plate 12
A permeated liquid flow channel 16 is formed in the inner surface of the recessed portion, and one end of the permeated liquid flow channel 16 opens to the bottom surface of the recess 13 and the other end communicates with the suction port portion 17.

The operation of the above structure will be described below.
A plurality of filtration membrane modules 11 are arranged in parallel with an appropriate gap A, and a negative pressure is applied to the inside of the filtration membrane module 11 through the suction port portion 17 and the permeate flow passage 16, so that the organic filtration membrane 15 and the permeate flow are obtained. The water to be treated is suction filtered through line 16. Further, the upward flow generated by the aeration or the submerged stirring blade is passed from the bottom side of the filtration membrane module 11 toward the top side. In this state, the upward flow 18 passing through the gap A between the adjacent filtration membrane modules 11 gives a shearing force to the cake layer adhering to the membrane surface, and the cake layer is peeled and washed.

At this time, the adjacent filtration membrane modules 11
The gap A between the two is the lower side H1 of the filtration membrane module 11.
At the upper side and narrower at the upper side H2. For this reason, the flow velocity of the upward flow 18 passing through the gap A becomes stronger as the cross-sectional area of the flow channel decreases toward the upper side of the filtration membrane module 11. Sufficient shear force can be applied to the cake layer throughout.

In addition, the spacer 14 is used as the recess 13 of the filter plate 12.
In the width direction of the filtration membrane module 11, the gap A generated between the adjacent filtration membrane modules 11 is It has a uniform width. Therefore, the gap A
The upward flow 18 passing through does not deviate to the both sides of the filtration membrane module as in the conventional case, and is always a uniform flow in the width direction when flowing from the bottom side to the top side of the filtration membrane module 11.

[0018]

As described above, according to the present invention, the gap between adjacent filtration membrane modules is gradually narrowed from the bottom side toward the top side, and the width is uniform in the width direction of the filtration membrane module. As a result, the upward flow uniformly flows at a sufficient flow rate, and the entire membrane surface of the filtration membrane module can be reliably washed.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a filtration membrane module according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a conventional filtration membrane module.

FIG. 3 is a plan view of a conventional filtration membrane module.

FIG. 4 is a front view of a conventional filtration membrane module.

[Explanation of symbols]

 11 Filter Membrane Module 12 Filter Plate 13 Recess 14 Spacer 15 Organic Filter Membrane

Claims (2)

[Claims] 1. A filtration membrane module provided with a filtration membrane covering the surface of a filtration plate, wherein the filtration plate is formed so that its thickness gradually decreases from the top side to the bottom side. Membrane module. 2. Forming a concave portion on the surface of the filter plate,
2. The filtration membrane module according to claim 1, wherein a spacer interposed between the filtration plate and the filtration membrane is arranged in the recess, and the filtration membrane is provided so that the entire membrane surface is a flat surface. ..