JPS6365908A - Separation device using tubular membrane - Google Patents

Abstract

PURPOSE:To generate turbulence in the flow of stock solution and speed up penetration without providing a turbulence accelerating mechanism by providing a protrusions inside a membrane holding tube. CONSTITUTION:For example, a band-shaped component 6 with protrusions 2 is wound spirally in a manner to face the protrusions 2 inwardly, and a membrane holding tube 1 having spiral protrusions 2 on the inner face is manufactured into which a cylindrical separating membrane 5 is inserted, both ends of the separating membrane 5 being clamped with end caps 3 to form a membrane module. When raw water is introduced from a through-hole 4, the separating membrane 5 is pressed to the inside of the membrane holding tube 1 by the pressure of raw water and transformed in a manner to seemingly float up the protrusions 2, forming a membrane 5 of uneven form. By this process, turbulence along the flow of the face of the membrane 5 is accelerated and the volume of penetrating water is increaced.

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a tubular membrane sheath 2, which is improved to suppress the formation of a concentration polarized layer or Kel layer and increase the amount of permeated water. This invention relates to a tubular membrane separation device.

[Traditional technique%#? ] In tube-type membrane bag necks such as ultrafiltration devices, reverse immersion membrane H9I devices, and precision filtration devices that have a few tube-type membrane modules, solutes are blocked on the membrane surface, so that 7 of the substance is
A Q-degree polarization layer is formed and the transmission rate decreases.

Further, in ultrafiltration devices, proteins, 71-type substances, and colloidal substances are often present as solutes. When the polarized layer becomes dense, these substances form a gel state on the membrane surface, creating resistance that reduces the permeation rate.

One method of reducing the factors that reduce the permeation rate (the presence of a negatively polarized layer or a gel layer) is to increase the turbulence of the flow on the stock solution side. Specifically, there are a method of increasing the flow rate of the stock solution and a method of using a turbulence promotion mechanism.

[Problems to be Solved by the Invention] However, the method of increasing the flow rate has the problem that although the permeation rate increases, the pump power becomes too much and is not economical.

In addition, methods for providing a turbulence promoting mechanism on the raw solution side of the membrane surface include a net-like mechanism, a spiral spring,
A static mixer or the like is used. However, when splitting a liquid containing 1 F of fine crystals in a single module with a turbulence acceleration of 1°G, or a liquid containing high SS, this is not practical as it may cause blockage.

[Means for Solving the Problems] The present invention is a back-type membrane separation device in which a separation membrane is installed on the inner surface of a membrane holding tube, characterized in that a protrusion is provided on the inner surface of the membrane holding tube. It is a tubular membrane device.

In addition, in the present invention, the protrusion can be provided in a spiral shape, for example.

[Function] In the tubular membrane flow dividing device of the present invention in which a protrusion is provided on the membrane holding tube, when a liquid to be treated is introduced into the membrane holding tube to carry out treatment, the liquid chamber becomes pressurized, so the separation membrane is pressed against the inner surface of the membrane holding tube and deforms so as to make the protrusion provided on the inner surface of the membrane holding tube stand out. When deformed in this way, the membrane surface of the ijl membrane becomes uneven, causing turbulence in the flow of the stock solution. This turbulence promoting effect increases the amount of permeated water.

Incidentally, by providing the above-mentioned protrusions as spiral protrusions and setting the interval between the protrusions to 5 to 30 mm, particularly 10 to 20 mm, the permeation rate is significantly increased.

Furthermore, if the height of the protrusion is too small, the effect of promoting turbulent flow will be small, and if the height of the protrusion is too high, the turbulent flow effect in the groove portion will be difficult to reach the entire membrane surface, and the effect will be reduced. For this reason, the height of the protrusion is 0. It is suitable to set it as about 5-2 mm.

The present invention is applicable not only to ultrafiltration devices but also to various membrane separation devices such as reverse osmosis clothes separation devices and precision filtration devices.

[Example] Examples will be described below with reference to the drawings.

FIG. 1 is a longitudinal sectional view of a main part of a module used in a tubular membrane distribution device according to an embodiment of the present invention.

Reference numeral 1 denotes a membrane holding tube, and a protrusion 2 is provided on the inner surface of the tube. In this embodiment, the protrusion 2 is provided as a spiral protrusion. An end cap 3 is screwed onto the end of the membrane holding tube 1, and a through hole 4 communicates the inside and outside of the membrane holding tube 1.

Similar end caps are provided on the 01'1Δ side in addition to the membrane holding tube 1. These end caps 3 have a cylindrical dividing membrane 5 pressed along the inner surface of the membrane holding tube 1.
is held between the inner circumferential surface of the end of the membrane holding tube 1. In addition, at the end of the separation membrane 5, the inner circumferential surface or outer circumferential surface thereof may be in contact with the end cap 3 or the membrane holding tube 1.

Such a membrane module can be manufactured, for example, as follows. First, a band-shaped member 6 having projections 2 as shown in FIG. 2 is prepared, and this is spirally wound so that the projections 2 are on the inside as shown in FIG. 3 to form a membrane holding tube 1 as shown in FIG. 4. A cylindrical public membrane 5 is inserted into this. Thereafter, the end cap 3 is screwed on to complete the membrane module shown in FIG. 1. The sides of the strip member 6 are attached to each other or lava laminated to form a pressure-resistant structure.

In Figs. 1 to 4, only one protrusion 2 is provided as shown in Fig. 5 (sectional view taken along the line V-V in Fig. 3), but as shown in Fig.
A strip-shaped member provided with a strip or more protrusions may also be used. Further, when winding the IF-shaped portion +, I 6, the band-shaped member 6 may be wound around the cylindrical separation membrane 5.

In a tubular membrane separator equipped with a membrane module having such a configuration, when raw water is introduced into the module through the through hole 4, the separation membrane 5 is moved by the water pressure of the raw water into the membrane holding tube 1 as shown in FIG.
At this time, since the protrusions 2 are provided, the membrane 5 is deformed so as to make the protrusions 2 stand out, and the separation membrane 5 becomes uneven.
Turbulent flow along the membrane surface of the separation membrane 5 is promoted, and the amount of permeated water increases. The permeated water flows between the molecular lA membrane 5 and the inner surface of the membrane holding tube 1, and is taken out from an outlet provided in the membrane holding tube 1, the end cap 3, or the like.

In the above embodiment, a spiral protrusion is used, but it is clear that the same effect can be achieved even if protrusions of other shapes are provided.

In the back type membrane separator of the present invention, the membrane surface in the membrane module can be cleaned by, for example, inserting a sponge ball or the like into the module and discharging the cleaning water. During this cleaning, since the protrusions are provided, the frequency of contact between the sponge ball and the membrane surface increases, allowing efficient cleaning.

[Effects of the Invention] As described above, the present invention provides a membrane holding tube with protrusions, which promotes turbulence in the yX liquid flow without providing a turbulence promoting fj1 side on the stock liquid side, and increases the permeation rate. It is possible to increase Furthermore, it is possible to reduce the cost of power consumed for liquid passage, and no additional equipment is required.

[Brief explanation of drawings]

Figure 1 is a partial cross-sectional view of the membrane module adopted in the example.
Figures 2, 3, and 4 are explanatory diagrams for manufacturing the membrane module, Figures 5 and 6 are cross-sectional views of the 91F-shaped member, and Figure 7 is a partial cross-sectional view of the membrane module in a state where water is flowing. be. 1... Membrane holding tube, 2... Protrusion B, 5...
・Separation membrane.

Claims (2)

[Claims] (1) A tubular membrane separation device in which a separation membrane is mounted on the inner surface of a membrane holding tube, characterized in that a projection is provided on the inner surface of the membrane holding tube. (2) The tubular membrane separation device according to claim 1, wherein the protrusion is provided in a spiral shape.