JP2001029952A - Immersion type membrane separation device - Google Patents

Abstract

(57) [Problem] To provide an immersion type membrane separation device capable of preventing vibration of a membrane cartridge. SOLUTION: A plurality of flat membrane cartridges 22 immersed in a processing tank are arranged vertically and in parallel at regular intervals, and an air diffuser 23 is arranged below the membrane cartridge 22 to form a membrane cartridge. Between the air diffusers 23, there are provided a plurality of rod-shaped members 1 arranged in parallel, and a bubble miniaturizing means 2 for miniaturizing air bubbles ejected from the air diffusers.

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 device using an organic flat membrane used as a solid-liquid separation device for high-concentration activated sludge.

[0002]

2. Description of the Related Art Conventionally, as a solid-liquid separation device used in a human waste treatment or a combined treatment septic tank, there is a membrane separation device as shown in FIG. In FIG. 5, the membrane separation device 21 is installed by immersing it in the water to be treated inside the treatment tank.
A plurality of flat membrane cartridges 22 and a diffuser 23 disposed below the membrane cartridges 22 are arranged in a box frame-shaped case 2
4 inside. Each of the membrane cartridges 22 has a membrane surface arranged in a direction along the vertical direction, and is arranged at a predetermined interval (6-1 to 1).
0mm) and arranged in parallel, from 50 to 200
One sheet is set. The air diffuser 23 is connected to an air supply source such as a blower (not shown) outside the tank via an air supply pipe.

[0003] The case 24 is usually made of FRP (fiber reinforced resin).
Etc., and is divided into a membrane case 25 and a diffuser case 26. In the membrane case 25, a predetermined number of slits for holding the membrane cartridges 22 at fixed intervals are formed in a pair of opposed slit panels 25a in the vertical direction. The air diffuser case 26 has a function of preventing the gas-liquid multi-phase flow generated by the air ejected from the air diffuser 23 from dissipating and guiding the gas-liquid multi-phase flow to the gap between the membrane cartridges 22. The multiphase flow acts as a sweep on the membrane surface of the membrane cartridge 22 to clean the membrane surface.

Each membrane cartridge 22 has a filtration membrane 22B disposed over both surfaces of a filter plate 22A, and a permeate outlet 2 communicating with a permeate passage formed in the filter plate 22A.
2C communicates with the water collecting pipe 28 via the tube 27. The water collecting pipe 28 communicates with the permeated liquid outlet pipe 29, and a pressing plate 30 for preventing the membrane cartridge 22 from floating is provided on the upper part of the membrane case 25 via a pressing rubber (not shown).

[0005]

In the above-described construction, during use, the upward flow of a gas-liquid mixed phase is generated in the processing tank by the aerated air ejected from the air diffuser 23, and the film cartridge is added to the gas-liquid mixed phase flow. 22 are exposed. When this gas-liquid multiphase flow flows into the flow path between the adjacent membrane cartridges 22, it collides with the lower end of each membrane cartridge 22 to generate vibration in the membrane cartridge 22. When the membrane cartridge 22 vibrates, the pressing rubber of the pressing plate 30 wears over time, and eventually the pressing plate 30 is damaged or the slit panel 25a is damaged.

An object of the present invention is to solve the above-mentioned problems, and an object of the present invention is to provide an immersion type membrane separation device capable of preventing vibration of a membrane cartridge.

[0007]

According to a first aspect of the present invention, there is provided an immersion type membrane separation apparatus comprising: a plurality of flat membrane cartridges which are immersed in a processing tank; And it is arranged in parallel at regular intervals, an air diffuser is arranged below the membrane cartridge, and between the membrane cartridge and the air diffuser, a plurality of rod-shaped members are arranged in parallel, and the air ejected from the air diffuser is The apparatus is provided with means for miniaturizing air bubbles.

[0008] With the above-described structure, air bubbles ejected from the air diffuser collide with each rod-shaped member of the air bubble miniaturizing means and become fine, and flow into the flow path between the membrane cartridges as fine air bubbles. Therefore, the bubbles of the air ejected from the air diffuser do not directly collide with the membrane cartridge, and each rod-shaped member of the bubble miniaturization means receives the impact, whereby the vibration of the membrane cartridge can be suppressed.

According to a second aspect of the present invention, in the immersion type membrane separation apparatus, each rod-shaped member is located opposite to the lower end face of each membrane cartridge, and the gas-liquid mixed phase containing air bubbles ejected from the air diffuser is provided. It forms a guide that guides the flow into the gap between adjacent membrane cartridges. With the above configuration, the guide body is opposed to the gas-liquid mixed phase flow at the lower end side of each membrane cartridge, thereby preventing the gas-liquid mixed phase flow from colliding with the lower end surface of the membrane cartridge, and the guide body receives the impact. Thus, the vibration of the membrane cartridge is suppressed, and the gas-liquid mixed phase flow smoothly flows into the gap between the membrane cartridges by the guide of the guide body, thereby further suppressing the vibration of the membrane cartridge.

According to a third aspect of the present invention, in the immersion type membrane separation device, a plurality of flat membrane cartridges to be immersed in the treatment tank are arranged in parallel in a vertical direction and at regular intervals, and are arranged below the membrane cartridge. A diffuser is arranged, and a guide body for guiding a gas-liquid multiphase flow including air bubbles ejected from the diffuser to a gap between the adjacent membrane cartridges is integrally formed at a lower end of the membrane cartridge. Things.

With the above structure, the guide body is opposed to the gas-liquid mixed phase flow at the lower end side of each membrane cartridge, and the gas-liquid mixed phase flow smoothly flows into the gap between the membrane cartridges by the guide of the guide body. Suppress vibration of cartridge.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. The immersion type membrane separation device in the present embodiment has the same basic structure as that described above with reference to FIG. 5, and thus members having the same functions are denoted by the same reference numerals and description thereof is omitted. In FIG. 1, a lattice 2 composed of a plurality of rod-shaped members 1 is arranged between a membrane cartridge 22 and an air diffuser 23 as a means for miniaturizing bubbles.

With this configuration, air bubbles ejected from the air diffuser 23 collide with the rod-shaped members 1 of the grid 2 and become finer, forming fine bubbles and flowing into the flow path between the membrane cartridges 22. Therefore, the air bubbles ejected from the air diffuser 23 do not directly collide with the membrane cartridge 22,
Each rod-shaped member 1 receives the impact, whereby the vibration of the membrane cartridge 22 can be suppressed.

FIG. 2 shows another embodiment of the present invention. The grating 3 has a shape in which a plurality of bar-shaped members 4 are arranged in parallel, and a slit 5 is formed between the bar-shaped members 4. Each bar-shaped member 4 of the lattice 3 faces the lower end surface of each membrane cartridge 22. According to this configuration, the rod-shaped member 4 is opposed to the gas-liquid mixed phase flow at the lower end side of each membrane cartridge 22 so that the gas-liquid mixed phase flow is
To reliably prevent the membrane cartridge 22 from oscillating.

FIG. 3 shows another embodiment of the present invention. The grating 6 has a shape in which a plurality of rod-shaped members 7 are arranged in parallel, and a slit 8 is formed between the rod-shaped members 7. Each bar-shaped member 7 of the lattice 6 is located opposite to the lower end surface of each membrane cartridge 22, and its cross-sectional shape is an inverted triangular shape protruding downward.
A guide body is formed to guide a gas-liquid multiphase flow containing air bubbles ejected from 3 to a gap between the membrane cartridges 22 adjacent to each other.

With this configuration, the rod-shaped member 7 serving as a guide is opposed to the gas-liquid mixed-phase flow at the lower end side of each membrane cartridge 22, thereby preventing the gas-liquid mixed-phase flow from colliding with the lower end surface of the membrane cartridge 22. Then, the rod-shaped member 7 serving as a guide receives the impact, so that the membrane cartridge 22
The vibration of the membrane cartridge 22 is further suppressed by smoothly flowing the gas-liquid multiphase flow into the gap between the membrane cartridges 22 by the guide of the guide body.

FIG. 4 shows another embodiment of the present invention, in which guide members 9 are provided at the lower ends of the membrane cartridges 22, respectively.
The guide body 9 has an inverted triangular shape having a cross-sectional shape protruding downward, and a gas-liquid multiphase flow containing air bubbles ejected from the air diffuser 23 is adjacent to each other. It guides into the gap between the membrane cartridges 22. With this configuration, the guide body 9 faces the gas-liquid mixed phase flow at the lower end side of each membrane cartridge 22, and the gas-liquid mixed phase flow smoothly flows into the gap between the membrane cartridges 22 by the guide of the guide body 9. In addition, the vibration of the membrane cartridge 22 is suppressed.

[0018]

As described above, according to the present invention, air bubbles are made minute by collision with each rod-shaped member of the bubble making means so that the air bubbles directly hit the membrane cartridge. Instead, the impact of each rod-shaped member is received, so that the vibration of the membrane cartridge can be suppressed. In addition, the guide body facing the lower end face of each membrane cartridge reliably receives the impact of the gas-liquid mixed phase flow, thereby suppressing the vibration of the membrane cartridge, and the guide body guides the gas-liquid mixed phase flow smoothly between the membrane cartridges. , The vibration of the membrane cartridge can be further suppressed. In addition, each membrane cartridge is opposed to the gas-liquid mixed phase flow by a guide body formed integrally at the lower end, and the guide body smoothly guides the gas-liquid mixed phase flow to the gap between the membrane cartridges, thereby suppressing vibration of the membrane cartridge. it can.

[Brief description of the drawings]

FIG. 1 is a perspective view showing the structure of a submerged membrane separation device according to an embodiment of the present invention.

FIG. 2 is a schematic diagram showing a main structure of a submerged membrane separation apparatus according to another embodiment of the present invention.

FIG. 3 is a schematic view showing a main structure of a submerged membrane separation device according to another embodiment of the present invention.

FIG. 4 is a schematic diagram showing a main structure of an immersion type membrane separation device according to another embodiment of the present invention.

FIG. 5 is a perspective view showing a conventional immersion type membrane separation device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Bar-shaped member 2 Lattice 22 Membrane cartridge 23 Air diffuser

Claims (3)

[Claims] According to a first aspect of the present invention, there is provided an immersion type membrane separation apparatus, wherein a plurality of flat membrane cartridges to be immersed in a treatment tank are arranged in a vertical direction and in parallel at regular intervals. An air diffuser is disposed below, and between the membrane cartridge and the air diffuser, a plurality of rod-shaped members arranged in parallel is provided, and a bubble miniaturizing means for miniaturizing air bubbles ejected from the air diffuser is provided. An immersion type membrane separation device characterized by the above-mentioned. 2. A gas-liquid multi-phase flow containing air bubbles ejected from an air diffuser is disposed in a gap between adjacent membrane cartridges, wherein each rod-shaped member is located opposite to a lower end surface of each membrane cartridge. The immersion type membrane separation device according to claim 1, wherein a guide body for guiding is provided. 3. A plurality of plate-shaped membrane cartridges immersed in a treatment tank are arranged vertically and in parallel at regular intervals, an air diffuser is arranged below the membrane cartridge, and at a lower end of the membrane cartridge, An immersion type membrane separation device, wherein a guide body for guiding a gas-liquid multiphase flow containing air bubbles ejected from an air diffuser to a gap between adjacent membrane cartridges is integrally formed.