JPH08155275A - Immersion type membrane module - Google Patents

Abstract

PURPOSE: To realize an apparatus wherein no cake layer is formed on the surfaces of hollow yarn membranes and the passages of raw water between the hollow yarn membranes are not closed. CONSTITUTION: The upper ends of a large number of hollow yarn membranes 1 closed at the lower ends thereof are inserted in a header 2 to which a membrane transmitted liquid take-out pipe 4 is connected is connected thereto or one ends of a large number of the hollow yarn membranes are inserted in the header to be fixed thereto while the other ends thereof are fixed to a support. Since the hollow yarn membranes 1 are freely shaken by the flow of raw water in a raw water treatment tank, the cake layer formed on the surfaces of the hollow yarn membranes by sludge in raw water can be removed and the closure of the passages of raw water caused by waste refuse in raw water can be prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a submerged membrane module applied to human waste treatment equipment, industrial wastewater treatment equipment, pure water production equipment in the semiconductor industry, and the like.

[0002]

2. Description of the Related Art In a conventional immersion type membrane module, as shown in FIG. 4, a header 2 in which a membrane permeate extraction pipe 4 is connected, a partition plate 16 is provided, and a void 3 is formed inside, a partition of the header 2 is provided. A support 5 arranged to face the plate 16 and connected to the header 2 via the guide plate 6, and a plurality of supports 5 having one end fixed to the support 5 and the other end penetrating the partition plate 16 provided on the header 2. The hollow fiber membrane 10 and the hole 9 through which the hollow fiber membrane 10 penetrates are provided and are formed between the header 2 and the support 5 and the reinforcing plate 8 fixed to the guide plate 6.

The submerged membrane module 11 is arranged in a treated raw water tank (aeration tank) 15 as shown in FIG. 5, and the raw water in the treated raw water tank 15 is the permeated liquid in the header 2. By being sucked by the vacuum pump 12 provided outside the tank 15, it permeates the hollow fiber membrane 10 to become a permeate.

Above the inside of the treated raw water tank 15, an aeration blower 13 and an air diffuser 14 are provided, to which air and nitrogen gas are supplied, and the ascending flow generated by the bubbles causes the continuous surface of the membrane 10 to be continuous. It was being washed.

The sludge component remaining in the treated raw water tank 15 due to the membrane separation is drawn out of the treated raw water tank 15 by a pump or the like through a drawing pipe provided in the treated raw water tank 15.

[0006]

In the conventional immersion type membrane module, it is difficult to give a uniform flow of raw water to the hollow fiber membrane surface, so that the cake layer adhering to the membrane surface becomes uneven and the hollow fiber The film sometimes deteriorated in a short time.
Further, since the plurality of hollow fiber membranes are fixedly arranged at equal intervals, there is a possibility that the flow path may be blocked by dust and fiber components in the raw water.

When the cake layer is formed or the flow path is blocked as described above, it is necessary to perform an artificial membrane cleaning operation, which causes problems in hygiene and cost. The present invention is intended to solve the above problems.

[0008]

[Means for Solving the Problems]

(1) The submerged membrane module of the present invention comprises a header to which a permeated liquid extraction pipe is connected, and an internal void, and an upper end of the header is inserted into the header and fixed in the insertion hole, and the lower end is closed so that the outer surface is treated. It is characterized by having a plurality of hollow fiber membranes that come into contact with the raw water in the water tank.

(2) In the immersion type membrane module of the present invention, a membrane permeated liquid extraction pipe is connected to the header having a void therein, and the header is disposed so as to face the header and is connected to the header via a guide plate. The support includes a plurality of hollow fiber membranes, one end of which is inserted into the header and the other end of which is fixed to the support with the slack fixed in the insertion hole and the outer surface of which contacts the raw water in the treated raw water tank. It is characterized by that.

[0010]

In the above invention (1), the raw water in the treated raw water tank passes through the hollow fiber membrane when the permeated liquid in the header is taken out to the outside, and the outer surface of the hollow fiber membrane does not contain the dirty water contained in the raw water. And so on to form a cake layer.

In the present invention, only the upper end of the hollow fiber membrane is fixed, and the lower end of the hollow fiber membrane freely moves due to the water flow of the raw water, so that the hollow fiber membranes sway each other to prevent the formation of the cake layer and to form the cake layer. If you do, you will be immediately dismissed.

Regarding the blockage of the raw water flow path between the hollow fiber membranes caused by dust or the like in the case of the conventional apparatus, this is because the flow path width is constantly changing due to the fluctuation of the hollow fiber membranes. It becomes possible to prevent it.

In the invention (2), both ends of the hollow fiber membrane are fixed to the header and the support, respectively. However, since the hollow fiber membrane has a slack in the middle portion, the hollow fiber membrane fluctuates due to the water flow of the raw water. Similarly to (4), the cake layer formed on the surface of the hollow fiber membrane is removed, and the blockage of the flow path of raw water is prevented.

[0014]

EXAMPLE A submerged membrane module according to a first example of the present invention will be described with reference to FIGS. 1 (a) and 1 (b).

The apparatus of this embodiment shown in FIGS. 1 (a) and 1 (b) has a hollow fiber membrane 1 whose cross section is formed as shown in FIG. Is provided with a header 2 which has an upper end inserted therein and is fixed in the insertion hole to which a permeated liquid extraction tube 4 is connected and which has a void 3 inside.

The apparatus of this embodiment has a treated raw water tank 1 shown in FIG.
5, when the vacuum pump 12 is driven and the permeated liquid that has permeated the hollow fiber membrane 1 is taken out of the system, the hollow fiber membrane 1 is formed by the water flow of the raw water generated in the treated raw water tank 15. Move freely

Therefore, the hollow fiber membranes 1 sway each other,
The cake layer is less likely to adhere to the film surface, and even if it adheres, the cake layer is easily removed. In addition, since the flow width of the raw water formed between the hollow fiber membranes 1 varies, it is possible to prevent clogging of the flow path due to dust and fibers.

The hollow fiber membrane 1 is an ultrafiltration membrane formed in a hollow cylinder, has an outer diameter of several m / m, and is made of a material such as polyolefin or polysulfone. In the case of the example, the permeate flows from the outside of the membrane to the inside. The header 2 is for collecting the permeated liquid obtained from each hollow fiber membrane 1.

The apparatus of the second embodiment of the present invention will be described with reference to FIG. In the apparatus of this embodiment shown in FIG. 2, a support 5 is connected to a header 2 to which a membrane permeated liquid extraction tube 4 is connected via a guide plate 6, and a plurality of hollow fiber membranes 1 has one end thereof. Is inserted into the header 2 and fixed in its insertion hole, and the other end is fixed to the support 5 with a slack.

In the above, since the plurality of hollow fiber membranes 1 are arranged in a slack state, the hollow fiber membranes 1 are shaken by the flow of raw water and shake each other as in the first embodiment. The cake layer is removed, and it is possible to prevent clogging of the raw water flow path due to dust and fiber.

[0021]

The submerged membrane module of the present invention has a plurality of hollow fiber membranes whose lower ends are closed by inserting the upper ends of the hollow fiber membranes into the header to which the membrane permeate extraction pipe is connected and fixing them. By inserting one end of the hollow fiber membrane of the book into the header and fixing it, and fixing the other end to the support, the hollow fiber membrane moves freely due to the flow of raw water in the treated raw water tank, so that it does not become dirty in the raw water. As a result, the cake layer formed on the surface of the hollow fiber membrane can be removed, and the clogging of the flow path of the raw water due to dust in the raw water can be prevented.

[Brief description of drawings]

FIG. 1 is an explanatory view of an immersion type membrane module according to a first embodiment of the present invention, (a) is an overall cross-sectional view, and (b) is a cross-sectional view of a hollow fiber membrane.

FIG. 2 is a sectional view of an immersion type membrane module according to a second embodiment of the present invention.

FIG. 3 is a cross-sectional view of a conventional submerged membrane module.

FIG. 4 is an explanatory view of a treated raw water tank in which the above-mentioned conventional submerged membrane module is arranged.

[Explanation of symbols]

 1 Hollow Fiber Membrane 2 Header 3 Void 4 Membrane Permeate Extraction Tube 5 Support 6 Guide Plate 7 Flow of Treated Raw Water 12 Vacuum Pump 13 Aeration Blower 14 Diffuser 15 Treated Raw Water Tank

Claims (2)

[Claims] 1. A header to which a membrane permeated liquid extraction pipe is connected and which has a void inside, and an upper end which is inserted into the header and which is fixed to the insertion hole and closed at the lower end so that the outer surface comes into contact with raw water in a treated raw water tank. An immersion-type membrane module comprising a plurality of hollow fiber membranes. 2. A header to which a membrane permeated liquid extraction pipe is connected and which has a void inside, a support which is arranged so as to face the header and is connected to the header via a guide plate, and one end of which is inserted into the header. An immersion-type membrane module comprising a plurality of hollow fiber membranes, the other end of which is fixed to the support while being fixed to the insertion hole, and the outer surface of which is in contact with raw water in a treated raw water tank.