JPS59150505A - Liquid separation apparatus - Google Patents

Abstract

PURPOSE:To allow a liquid to be treated to uniformly flow over the entire surface region of a membrane leaf, by spirally winding a plurality of membrane leaves around a water collecting pipe while supplying the liquid to be treated to the gaps between the membrane leaves in adjacent relation to each other. CONSTITUTION:This membrane element is constituted by winding membrane leaves each formed by molding a semi-permeable membrane 8 into an envelope form while providing a water guide material 9 therein around a water collecting pipe 7 and a distribution pipe 11 of a liquid to be treated is provided in the gap between adjacent membrane leaves in parallel to the spiral axis in close proximity to the central part of the element 1. In this element, the liquid to be treated is supplied on the membrane surfaces through the small perforations of the distribution pipe 11. Both ends of this element 1 are respectively closed and the liquid to be treated is spirally flowed along the membrane leaves in the reticulated spacers 10 between the membrane leaves and, therefore, a uniform stream can be secured over the entire membrane surface region of the semi-permeable membrane.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a liquid separation device using a semipermeable membrane, and more particularly to a spiral type liquid separation device using a reverse osmosis membrane or an ultrafiltration membrane.

A conventional spiral type liquid separation device using the reverse osmosis method or ultraf-filtration method is the
4-14216, a membrane permeate flow path formed in an envelope shape with two semipermeable membranes, that is, a membrane leaf with a perforated hollow tube as its starting point and a mesh spacer stacked around it. The most common device is one in which the liquid to be treated flows in the axial direction of a perforated hollow tube along a mesh spacer located outside the membrane permeate flow path.

By the way, Japanese Patent Publication No. 44-14216 describes an example in which one membrane leaf obtained by molding a semipermeable membrane into an envelope shape is provided per one spiral element, but this is not practical. In this case, a plurality of membrane leaves are provided per spiral element, resulting in a more efficient design.

An example in which a plurality of membrane leaves are provided per one spiral element is also found in Japanese Patent Publication No. 49-8629.

However, in conventional spiral-type liquid separation devices of this type, the liquid to be treated flows in the axial direction between the layers of the spirally wound membrane leaf and the mesh spacer, so the contact distance between the liquid to be treated and the membrane is short, resulting in separation. It has the disadvantage of low efficiency. In addition, in this type of separation device, it is practically difficult to make the liquid to be treated flow uniformly in the axial direction between the many layers formed by the membrane leaves wound in a spiral shape and the mesh spacer.

Therefore, it must be said that it is impossible to expect a uniform flow of permeate over the entire membrane area of the semipermeable membrane to be accommodated.
This is also a cause of a decrease in separation efficiency.

Of these two problems, the first problem, the short contact distance between the liquid to be treated and the membrane, was improved.
There is a device typified by the proposal in Publication No. 2-5431. In this type of apparatus, the liquid to be treated flows spirally along the membrane leaf, so that the contact distance between the liquid to be treated and the membrane can be relatively large, and the first problem mentioned above is improved. However, no device has yet been found that satisfactorily solves the second problem of ensuring that the liquid to be treated flows uniformly through the plurality of flow paths for the liquid to be treated formed between the membrane leaves.

An object of the present invention is to provide a liquid separation bag N that promptly responds to the above-mentioned problems and solves them.

That is, the present invention provides a liquid separation device composed of spiral elements of semipermeable membranes, in which the contact distance between the liquid to be treated and the membrane leaves is long, and the liquid to be treated flows uniformly over the entire area of the membrane leaves. The purpose is to provide an improved type of device, which is characterized by a network of membrane leaves around a perforated hollow water collection pipe located in the center. Liquid separation consisting of a spiral element wound up in a spiral shape through a spacer, in which the liquid to be treated is supplied between adjacent membrane leaves, and the membrane permeate liquid obtained inside the membrane leaves is collected in the water collecting pipe. In the apparatus, both ends of the spiral element crossing the spiral axis are respectively closed, and at least one liquid distribution pipe to be treated is arranged between adjacent membrane leaves parallel to the spiral axis, preferably at the center of the spiral element. The reason is that it is located close to the section.

Hereinafter, more specific embodiments of the liquid separation device according to the present invention will be described in detail using examples shown in the accompanying drawings.

FIG. 1 is an overall vertical sectional view showing one example of the liquid separation device of the present invention, in which a high-pressure container consisting of a cylindrical container (2), an end plate on the inlet side (3), and an end plate on the outlet side (4) is shown. A spiral element (1) is installed. The material to be processed is supplied from the stock solution supply port (5), and the spiral element (1
) and then discharged from the concentrate outlet (6).

On the other hand, the membrane-permeated liquid obtained by membrane treatment is obtained through a water collection pipe (7) provided at the center of the spiral element (1).

FIG. 2 shows an apparatus of the present invention having the above configuration.
As a specific example of the spiral element (1) 4- which forms the main part, a vertical cross-sectional view of an embodiment in which the number of membrane leaves is three is shown, and FIG. 3 is a cross-sectional view taken along the line A-A in FIG. It is.

In these figures, the membrane leaf applied to the present invention has a semipermeable membrane (8) shaped like an envelope, and a water conducting material (9) inside.
), the membrane leaf is connected to a water collection pipe (7), and the membrane permeate in the membrane leaf is guided to the water collection pipe (7) through a large number of small holes 04).

In this case, various conventionally known methods can be used to connect the membrane leaf and the water collection pipe (7).

Therefore, in the spiral element (1) described above, the present invention has a feature that a stock solution supply port ( 5) To be treated liquid distribution pipe (11) that distributes and supplies the to be treated liquid supplied from
), which has a large number of small holes (15) for supplying the liquid to be treated on the membrane surface.

Therefore, the liquid to be treated is supplied from the raw liquid supply port (5), passes through the liquid to be treated distribution pipe 01), and is supplied onto the membrane surface through a large number of small holes (15) provided therein.

In addition, although the to-be-treated liquid distribution piping 01) is shown in the figure, three pipes are provided, one water-dead between each membrane leaf, the number can be at least one or more in total, and an appropriate number can be selected.

Furthermore, it is necessary to provide a mesh spacer 00) between the membrane leaves outside of the liquid distribution pipe to reduce concentration polarization on the membrane surface.

In this way, the liquid to be treated eventually flows spirally through the spiral membrane I-(1) along the membrane leaves, is concentrated, and is discharged from the concentrate outlet (6).

In addition, in the above flow, it should be avoided that the liquid to be treated that is supplied from the raw liquid supply port (5) directly passes through the concentrated liquid outlet (6) without passing through the inside of the spiral element (1). In order to prevent this, the spiral element (1) is provided with a partition plate (b) and an O-ring 06) to ensure sealing.

In addition, in order to ensure the spiral flow of the liquid to be treated in the spiral element (1), a membrane leaf is attached to the partition plate ((2)) on the side of the partition plate 02) to prevent the liquid to be treated from flowing in the spiral direction. In addition to preventing the axial flow of the adhesive (13
), it is important to block both ends of the spiral element (1) that cross the spiral axis, such as to prevent the axial flow of the liquid to be treated.

The separation device of the present invention is constructed as described above, and the spiral element has not only a membrane leaf inside it, but also
Since the liquid to be treated is equipped with a distribution pipe, it is easy to uniformly flow the liquid to be treated through the multiple channels formed between the membrane leaves, and this allows the liquid to be uniformly distributed over the entire membrane area of the semipermeable membrane. A uniform flow of the liquid to be treated can be ensured over the entire area, and the solute removal performance of the liquid separation device can be significantly improved.

[Brief explanation of the drawing]

FIG. 1 is an overall vertical cross-sectional view showing an embodiment of a liquid separation device of the present invention, FIG. 2 is a vertical cross-sectional view of an embodiment of a spiral element of the present invention, and FIG. 3 is an A-A in FIG. FIG. 3 is a cross-sectional view showing the center of a line-cut surface. (1)・・・・・・・・・Spiral element. (2)・・・・・・・・・Cylindrical container, (3)・・・
......Inlet side end plate. 7- (4)... Outlet side end plate, (5)...
−・・・・・・・・・Standard solution supply port. (6) Concentrate outlet, (7)
...... Water collection pipe. (8)・・・・・・・・・Semi-permeable membrane, (9)・・・
・・・・・・Water conduction material. Oo)・・・・・・・・・Mesh spacer. (n)・・・・・・・・・・・・Liquid distribution pipe to be treated. 02)・・・・・・・・・Partition plate, 03)・・・・・・
·······glue. 04)・・・・・・・・・・Small hole, (15
)・・・・・・・・・・Small hole. 06)・・・・・・・・・・・・0 ring. 8- V1 eye rod Z eye/'' Mouth A de et. ・ One funeral---- 713 60-

Claims (1)

[Claims] l. Consisting of a spiral element formed by winding a plurality of membrane leaves in a spiral shape around a perforated hollow water collection pipe located in the center via a mesh spacer, In a liquid separation device in which a liquid to be treated is supplied between the membrane +J-7 and a membrane permeate liquid obtained inside the membrane leaf is collected in the water collection pipe, both edges of the spiral element transverse to the spiral axis are A liquid separation device characterized in that at least one liquid distribution pipe to be treated is provided in parallel to a spiral axis between adjacent membrane leaves, each of which is closed. 2. The liquid separation device according to claim 1, wherein the liquid distribution pipe to be treated is provided close to the center of the spiral element.