JP3333116B2 - Membrane separation device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an immersion type membrane separation apparatus used for treating sewage and the like.

[0002]

2. Description of the Related Art Conventionally, in the treatment of sewage and the like, as shown in FIG. 3, for example, a membrane separation device 11 is installed inside an aeration tank 12 to separate an activated sludge mixed liquid 13 in the tank into solid and liquid. ing.

[0003] The membrane separation device 11 is as shown in FIG. 4, in which a plate-like membrane cartridge 15 is arranged inside a membrane case 14 opened up and down, and an air diffusion case provided below the membrane case 14. An air diffuser 16 is provided inside 14 '. The membrane cartridge 15 has a filtration membrane 15B disposed on both surfaces of a filter plate 15A, and a permeate collection passage communicating with a permeate flow path formed between the filter plate 15A and the filtration membrane 15B or inside the filter plate 15A. The outlet 15C is formed in the filter plate 15A, and the end of the permeate tube 17 provided in communication with the permeate outlet 15C of each membrane cartridge 15 is open to the outside of the aeration tank 12 under atmospheric pressure. .

In such a configuration, raw water 19 is introduced into the aeration tank 12, and nitrogen and organic substances in the raw water 19 are removed by the action of activated sludge in a state where aerated air is blown out from the diffuser 16. The activated sludge mixed solution 13 in the tank is used as a driving pressure with the head thereof as a driving pressure.
(The suction filtration is also possible by interposing a suction pump in the permeate tube 17), and the membrane cartridge 15
The permeated liquid that has passed through the membrane surface is led out of the tank through a permeated liquid pipe 17. At this time, the membrane surface of the membrane cartridge 15 is cleaned by the bubbles of the aerated air ejected from the air diffuser 16 and the rising water flow generated thereby.

[0005]

In order to fix the membrane cartridge 15, as shown in FIG. 5, a membrane (not shown) of a receiving portion 14A formed integrally with a lower portion of the membrane case 14 is provided. The cartridge 15 is fitted therein, and is held down by a holding rubber 20 and a holding plate 21 in order to prevent floating due to aeration air or rising water flow.

However, even if the membrane cartridge 15 is pressed by the holding rubber 20 and the holding plate 21 in this manner, the membrane cartridge 15 vibrates due to the aerated air or the rising water flow, and the vibrations and the like cause not only the membrane cartridge 15 but also the membrane case 14 to be particularly vibrated. The receiving portion 14A may be worn.

Since the filtration function of the membrane cartridge 15 gradually deteriorates even after chemical washing, the membrane cartridge 15 is replaced every two to five years depending on the type of wastewater treatment to be applied. It is relatively easy because the replacement work only needs to be performed one by one.

On the other hand, the membrane case 14 and the diffuser case 1
Since 4 'is immersed in the activated sludge mixture 13, it is necessary to temporarily suspend the processing for replacement or repair work, and the work itself becomes troublesome. On the one hand, these membrane cases 1
It is desirable that the air diffusion case 4 and the air diffuser case 14 ′ have no moving parts, are simple in structure, and can be used semi-permanently.

An object of the present invention is to solve the above-mentioned problem, and an object of the present invention is to provide a membrane separation device in which a membrane case does not wear even when a membrane cartridge vibrates.

[0010]

According to a first aspect of the present invention, there is provided a membrane separation apparatus, comprising: Are arranged at appropriate intervals, and the lower end on both sides of each membrane cartridge is supported by a receiving portion provided along the inner side surface of the membrane case. The sheet in which the groove to be fitted is formed is detachably provided.

According to a second aspect of the present invention, the receiving portion is detachably provided at a lower end of the membrane case. Claim 3
In the membrane separation device described above, a holding plate for holding the peripheral edge of the upper end of each membrane cartridge from above is detachably provided on the membrane case.

According to the first aspect of the present invention, even if the membrane cartridge vibrates due to the aerated air or the rising water flow, the wear of the receiving portion can be prevented by the presence of the sheet.
According to the configuration of the second aspect, when the seat is worn, the receiving portion may be removed from the membrane case and then the seat may be replaced, and the work is easy.

In the case where the membrane cartridge easily floats due to the aerated air or the rising water flow, the lifting of the membrane cartridge can be prevented by providing the pressing plate according to the third aspect.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a membrane separation apparatus according to an embodiment of the present invention. The overall configuration of this membrane separation apparatus is substantially the same as the conventional one described above with reference to FIG. The members having the function will be described with the same reference numerals.

The membrane separation device 11 includes a vertically oriented flat membrane cartridge 1 inside a membrane case 14 having an open top and bottom.
5 are arranged in parallel at a predetermined interval, and an air diffuser 16 is disposed inside an air diffusion case 14 ′ provided below the membrane case 14.

The upper end of the membrane case 14 is bent outward, and a rubber sheet 20 as shown in FIG. 2 is placed inside the upper end surface thereof. Holding plate 21 for holding cartridge 15 from above
Are bolted to the membrane case 14. The sheet 20 has a groove 2 into which the peripheral edge of the upper end of each membrane cartridge 15 is fitted.
2 are formed.

A receiving portion 2 having an L-shaped cross section along the inner surface of the membrane case 14 is provided between the membrane case 14 and the air diffuser case 14 '.
3 is interposed and bolted. In a concave portion between the receiving portion 23 and the inner side surface of the membrane case 14, a rubber sheet 26 having a groove 25 into which the lower peripheral edge of the membrane cartridge 15 is fitted is provided as shown in FIG. I have.

According to the above-described configuration, even if the aerated air or the rising water flow makes the membrane cartridge 15 easily float, the holding plate 21 prevents the membrane cartridge 15 from rising. Also, even if the membrane cartridge 15 vibrates, the sheets 20, 26 prevent the membrane cartridge 15, the receiving portion 23, and the holding plate 21 from being worn.

When the seat 20 is worn, the holding plate 21 is removed from the top and then replaced. When the seat 26 is worn, the bolts connecting the membrane case 14 and the air diffuser case 14 'are removed. The sheet 26 may be replaced after removing the sheet and the frame body 24 together outside the tank.

If the sheet 26 is made of an elastic material such as rubber, the abrasion of the membrane cartridge 15 can be prevented.
It may be made of a material harder than the membrane cartridge 15, such as BS or SUS.

Since the membrane case 14 does not wear,
If it is made of FRP or SUS, it can be used semi-permanently. The frame 24 may also be made of FRP or SUS.

[0022]

As described above, according to the present invention, by providing a replaceable sheet at the receiving portion of the membrane case which is easily worn by the vibration of the membrane cartridge, the membrane case body can be used semi-permanently. .

[Brief description of the drawings]

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

FIG. 2 is an enlarged sectional view showing a receiving portion provided in the membrane separation device of FIG. 1 to support and fix the membrane cartridge.

FIG. 3 is an explanatory view showing a state in which a conventional membrane separation device is immersed and installed in an aeration tank.

FIG. 4 is an explanatory diagram showing an overall configuration of a conventional membrane separation device.

FIG. 5 is a longitudinal sectional view of the membrane separation device of FIG.

[Explanation of symbols]

 14 Membrane case 15 Membrane cartridge 21 Holding plate 23 Receiving part 24 Frame 25 Groove 26 Sheet

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Masahiro Yata 2-47, Shikitsu-Higashi 1-chome, Namiwa-ku, Osaka-shi, Osaka (72) Inventor Masaharu Nishi Shikitsu-Higashi, Naniwa-ku, Osaka, Osaka 1-2-47 Kubota Co., Ltd. Examiner Tadahiro Sanada (56) References JP-A-7-299339 (JP, A) JP-A-7-299479 (JP, A) JP-A 10-156151 (JP, A) (58) Field surveyed (Int. Cl. ⁷ , DB name) B01D 63/08

Claims (3)

(57) [Claims] 1. A vertically arranged flat plate-like membrane cartridge is arranged at a predetermined interval inside a box-frame-like membrane case having an open top and bottom, and the lower ends on both sides of each membrane cartridge are provided along the inner side surface of the membrane case. In the membrane separation device supported by the receiving part,
A membrane separation device, wherein a sheet having a groove into which the lower peripheral edge of each membrane cartridge is fitted is detachably provided on the upper surface of the receiving portion. 2. The membrane separation device according to claim 1, wherein the receiving portion is detachably provided at a lower end of the membrane case. 3. The membrane separation device according to claim 1, wherein a holding plate for holding an upper peripheral portion of each membrane cartridge from above is detachably attached to the membrane case.