JPH0938471A - Flat membrane element and flat membrane module - Google Patents

Abstract

(57) 【Abstract】 PROBLEM TO BE SOLVED: An inexpensive flat membrane module of various sizes which is suitably used when it is immersed in a stock solution tank and is permeated / separated by reducing the pressure on the permeate path side, which is easy to carry. -Provide A frame body (1) is assembled by a horizontal member (12), a hollow vertical member (11), and a joiner (13) connecting these members, and both ends of a permeate passage spacer (21) have both vertical members (11).
The perimeter of each flat membrane 21 inserted into the inside of the permeation liquid passage spacer 22 via the slit 112 of the member is the frame body 1.
A plurality of flat membrane elements A, each of which is adhered to each side surface thereof and has a permeate outlet 130 provided on at least one of both upper side joiners 13 and in which vertical members are closely contacted with each other, are joined together to form a joiner for all flat membrane elements. It is integrated by a bolt 3 passed through 13.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flat sheet membrane element and a flat sheet membrane module used when a flat sheet membrane module is immersed in a stock solution tank to permeate and separate the stock solution.

[0002]

2. Description of the Related Art Various types of membrane separation devices have been proposed in accordance with the intended use. As an alternative device to a conventional diffuser-type septic tank, FIG. 9 (a) and FIG. 9 (b) [Fig. 9 (a) is a sectional view taken along the line [a]].
A plurality of flat membrane elements A'in which the peripheries of the flat membranes 21 'and 21' sandwiching the support 22 'are adhered to the respective side surfaces of the frame 1', and the permeated liquid outlet 130 'is provided on the upper portion of the frame 1'. As shown in FIG. 10, the flat membrane module B'is assembled by inserting the sheets in a case C in a parallel state and with a gap between them, to assemble the flat membrane module B '. Stock solution tank 4 as shown in FIG.
1 ', and the diffusing tube 4 below the flat membrane module B'.
It is known that 3'is provided and the permeated liquid outlet of each flat sheet membrane element A'is connected to a vacuum pump 48 '.

In order to treat the stock solution with this membrane separation device, a flat membrane module B'is driven by a vacuum pump 48 '.
The pressure of the permeate passage side is reduced to generate a transmembrane pressure difference. Permeation / separation is performed under the transmembrane pressure difference and air is ejected from the air diffuser 43 'by driving the blower 45'. The liquid-mixed flow is raised through the gap between the flat membrane elements A ′ and A ′, and the collision of the gas-liquid mixed flow with the membrane surface and the vibration of the membrane suppress the adhesion of suspended substances to the membrane surface. The decrease in permeation flow velocity is prevented as much as possible. In this membrane separation, especially when the stock solution is a suspension containing a large amount of organic matter, the organic matter in the wastewater is adsorbed and metabolized by floating activated sludge under aerobic conditions to grow the activated sludge. Go. That is, the microbial reaction also progresses.

[0004]

In the treatment of the undiluted solution by the above-mentioned membrane separation device, the undiluted solution in the liquid tank to be treated is swirled by the air jetted from the air diffusing pipe, and the above-mentioned air-scrubbing or microbial reaction occurs. In order to satisfactorily carry out the sludge decomposition treatment by, it is necessary to make the flow rate around 1 m / sec.

Thus, in the above-mentioned membrane separation apparatus, parallel flat membrane elements are collectively assembled with a case to assemble a flat membrane module so as to withstand a violent circulation of the stock solution.
However, since the case is used, it is heavy and the flat sheet membrane module is not easy to carry. Also, since the flat membrane element support uses a plastic injection molded product, the die cost is high, and if various sizes are manufactured, the high cost of the flat membrane element results in a high die cost. Inevitably, its practical application is limited to urinary purification and the like because the treatment cost is not so much a problem in terms of environmental hygiene, and its application range is narrow.

An object of the present invention is to place the submerged liquid in a stock solution tank,
An object of the present invention is to provide an inexpensive flat membrane module of various sizes that is suitable for use in the case of performing permeation / separation by reducing the pressure on the permeate passage side and is easy to carry.

[0007]

In the flat sheet membrane element according to the present invention, a frame body is assembled by a horizontal member, a hollow vertical member and a joiner connecting these members, and both end portions of a permeate passage spacer are provided. Are inserted into both the vertical members through the slits of the members, and the peripheries of the flat membranes sandwiching the permeate passage spacers are adhered to the respective side surfaces of the frame body so as to permeate at least one of both upper side joiners. This is a configuration characterized in that a liquid outlet is provided. A flat sheet membrane module according to the present invention is characterized in that the flat sheet membrane element is formed by stacking a plurality of hollow vertical members in close contact with each other and integrating them by a bolt passed through a joiner of all flat sheet membrane elements. The configuration is

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a frame body 1 which is one member of the flat sheet membrane element according to the present invention, and includes a vertical member 11, a horizontal member 12 and a joiner 13 for connecting these members.
It is assembled from. FIG. 2 shows the vertical member 1 of the frame body.
1 has a hollow main body portion 111 and a slit portion 112, and is formed by extrusion molding of plastic. FIG. 3 shows the lateral member 12 of the frame body, which is a hollow body having a bridge portion 121 at the center of the inside thereof, and its lateral width b is made equal to the outer width a of the slit portion 112 of the vertical member 11. Like the vertical member 11, the horizontal member 12 is also formed by extrusion molding of plastic. Reference numerals 120 and 120 are grooves formed in the centers of both side surfaces of the lateral member. The lateral member 12 may be a solid body.

FIG. 4 shows the joiner 13 of the frame body ((a) of FIG. 4 is a side view, (b) of FIG. 4 is a front view), the joiner main body 13a, and a lateral member. 1
A half socket 131 for receiving the height half of the two ends, and the vertical member 1
The joiner main body 13a is provided with an insertion port 132 to be inserted into the main body portion 111 at one end, and an insert plate portion 133 to be inserted into the hollow portion in one half of the transverse member end portion and the slit portion of the vertical member. Is equal to the thickness of the hollow main body 111 of the vertical member 11. In FIG. 4, 1310 is a slot for guiding the grooves 120, 120 on both side surfaces of the lateral member 12. Reference numeral 130 denotes a permeated liquid take-out pipe 130 provided in a joiner used for connecting both upper ends of the frame body, which is communicated with a vertical member end insertion port 132.

To assemble the frame body shown in FIG. 1 using the vertical member 11, the horizontal member 12, and the joiner 13 described above,
The slot 1310 of the semi-receptacle 131 of the joiner 13 is guided in the grooves 120, 120 on both sides of the lateral member 12 to fit the joiner 13 into the lateral member 12 end,
Half of the height of the end half half of the joiner 13 on the outer surface of the joiner 13
And insert a part 133 'of the insert plate part 133 of the joiner 13 into the hollow of the other half part. Further, the hollow main body 111 at the end of the vertical member 11 is attached to the joiner-1.
3 is fitted on the outer surface of the insertion hole 132, and the remaining portion of the insert plate portion 133 of the joiner 13 is fitted into the slit portion 112 at the end of the vertical member 11. Then, the boundary between the joiner and the horizontal member and the boundary between the joiner and the vertical member are respectively sealed and bonded with an adhesive, the vertical member and the horizontal member are connected, and this joining is performed by 4 corners. Go and complete the frame assembly. In the frame body assembled in this manner, the outer surface of the slit portion of the vertical member and the side surface of the horizontal member are flush.

FIG. 5 (a) is a plan view of the flat sheet membrane element A according to the present invention, and FIG. 5 (b) is a cross-sectional view of the flat membrane element A in FIG. Spacer 2
2 (for example, a plastic net, a plastic non-woven fabric, a tricot, etc.) are inserted into both vertical members 11, 11 through slits 112, 112, and each flat membrane 21, which sandwiches the permeate passage spacer 22, The periphery of 21 is adhered to each side surface of the frame body 1 with an adhesive (not shown).

FIG. 6 shows the passage of the permeated liquid in the flat sheet membrane element according to the present invention. The solvent (water) in the undiluted solution permeates the membrane 21 under the transmembrane pressure difference due to the reduced pressure in the flat sheet membrane element A. Then, the permeated liquid reaches the inside of the hollow of the vertical member 11 through the permeated liquid passage spacer 22, and is taken out from the permeated liquid take-out pipe 130 attached to the joiner 13.

FIG. 7 is a perspective view showing a flat sheet membrane module B according to the present invention. In FIG. 7, A, ... Denote the above-described flat sheet membrane elements, and stack a plurality of vertical members in close contact with each other so that the side surfaces of the joiners-13, 13 ,.
The bolts 3 are passed through the joiners 13, ..., and integrated by tightening these bolts, and the permeated liquid take-out tubes 130 are arranged in alternate positions on one of the upper joiners of each flat membrane element. It is attached. Of course, the gap between the bolt insertion hole of the joiner and the bolt is sealed watertight. If the bolt insertion hole in the joiner is bored independently from the cavity inside the joiner, this seal is unnecessary. In the above, it is also possible to provide a collar or an ear portion on the joiner and to punch a bolt insertion hole in the collar or the ear portion. In the flat sheet membrane module B according to the present invention described above, the vertical members 11, 11 of the flat sheet membrane element are in close contact with each other, and substantially have a peripheral wall structure that is opened only up and down.

The permeated liquid take-out pipe 13 of the above-mentioned joiner 13
0, the half receiving port 131, the insertion port 132, and the insert plate portion 133 are integrally formed during injection molding of the joiner 13. For joiners that do not have a permeate extraction tube,
It is molded by changing the injection mold. Flat membrane module
In both cases, both joiners above each flat membrane element
Both may be equipped with a permeated liquid extraction pipe. In addition, a spacer with a certain thickness is interposed between the joiners of the flat sheet membrane elements adjacent to each other, and a bolt is inserted between the joiner and the spacer to widen the gap between the flat sheet membrane elements to integrate the flat sheet membrane elements. It is also possible to convert.

FIG. 8 shows a membrane separation device using the flat membrane module according to the present invention. In FIG. 8, reference numeral 41 denotes an open type liquid tank to be treated. Reference numeral B denotes a flat membrane module according to the present invention, which has a skirt 42 attached to the lower end thereof and is arranged on the bottom surface of the liquid tank 41 to be treated. Reference numeral 43 is an air diffuser arranged in the skirt 42, 44 is an air supply pipe, and 45 is a blower. Reference numeral 46 is a filtrate take-out pipe connected to the filtrate confluence pipe 47 of the flat sheet membrane module B, and 48 is a suction pump inserted in the pipe 46. 49 is a suspension supply pipe, and 50 is a liquid feed pump inserted in this pipe 49.

To treat a suspension such as sewage such as domestic sewage or factory sewage using this membrane separation device, the sewage is supplied to the liquid tank 41 to be treated by the liquid feed pump 50 and the blower 45 is operated. Air is ejected from the air diffuser 43 by driving,
The gas-liquid mixed flow is swirled through the stock solution flow passage gap between the flat sheet membrane elements A and A, and the membrane surface is air-scrubbed, while the suction pump 48 is driven to reduce the pressure on the filtrate passage side of the flat sheet membrane module B. Then, a predetermined transmembrane pressure difference is generated, and organic matter in wastewater is adsorbed and metabolized by aerobic microorganisms in contact with air to allow water to permeate while aerobic microorganisms grow, and the filtrate is taken out. It is taken out to the filtrate storage tank 51 via the pipe 46. In this case, since both sides of the stock solution flow passage gap between the flat sheet membrane elements A and A are closed by the close contact of the vertical members, air-scrubbing can be efficiently performed without letting air escape in the lateral direction.

[0017]

In the flat sheet membrane element according to the present invention, the vertical member and the horizontal member are connected by the joiner to assemble the frame body, and the flat sheet membrane is attached to both side surfaces of the frame body. By adjusting the length of the horizontal member, etc. by cutting, the size of the frame can be easily changed using the same vertical member, horizontal member and joiner member, and expensive injection molding dies of various sizes are prepared. It is not necessary and flat membrane elements of various sizes can be provided at low cost.

Further, in the flat sheet membrane module according to the present invention, a plurality of the above flat sheet membrane elements are stacked with the vertical members in close contact with each other, a bolt is passed through the joiner, and the plurality of sheets are fastened by tightening the bolts. Since the flat sheet membrane elements are integrated, a case for integrating a plurality of flat sheet membrane elements is not necessary, and the weight can be reduced. Therefore, according to the present invention, it is possible to provide a lightweight and easy-to-handle submersible flat membrane module of various sizes at a low cost, and a membrane module soaking / opening tank type liquid separation system can be provided on a small scale for household use. It can be used in a wide range from wastewater treatment to large-scale wastewater treatment in factories.

[Brief description of drawings]

FIG. 1 is a plan view showing an example of a frame body in a flat sheet membrane element according to the present invention.

FIG. 2 is an explanatory view showing an example of a vertical member in the flat sheet membrane element according to the present invention.

FIG. 3 is an explanatory view showing an example of a lateral member in the flat sheet membrane element according to the present invention.

4 (a) is a side view showing an example of a joiner in a flat sheet membrane element according to the present invention, and FIG. 4 (b) is a front view thereof.

5 (a) is a plan view showing an example of a flat sheet membrane element according to the present invention, and FIG. 5 (b) is a cross-sectional view taken along line 5 (b) of FIG.

FIG. 6 is an explanatory diagram showing a passage path of a permeated liquid in the flat sheet membrane element according to the present invention.

FIG. 7 is an explanatory view showing an example of a flat sheet membrane module according to the present invention.

FIG. 8 is an explanatory view showing an example of a membrane separation device using a flat membrane module according to the present invention.

FIG. 9 is an explanatory view showing a conventional flat sheet membrane element.

FIG. 10 is an explanatory view showing a conventional flat sheet membrane module.

FIG. 11 is an explanatory view showing a membrane separation device using a conventional flat membrane module.

[Explanation of symbols]

 1 Frame 11 Hollow Vertical Member 112 Slit 12 Horizontal Member 13 Joiner 21 Flat Membrane 22 Permeate Passage Spacer A Flat Membrane Element 3 Bolt B Flat Membrane Module

Claims (2)

[Claims] 1. A frame body is assembled by a horizontal member, a hollow vertical member, and a joiner connecting these members, and both ends of a permeate passage spacer are inserted into both vertical members through slits of the members. The periphery of each flat membrane sandwiching the permeate passage spacer is adhered to each side surface of the frame, and both upper side joiners are joined.
A flat sheet membrane element, wherein a permeated liquid take-out pipe is attached to at least one of the two. 2. The flat membrane element according to claim 1, wherein a plurality of hollow vertical members are closely contacted with each other and are stacked, and are integrated by bolts passed through a joiner of all flat membrane elements. Flat membrane module.