JPH07313851A - Suppressor for Membrane Surface Adhesion in Membrane Separator - Google Patents

Abstract

(57) [Summary] [Purpose] To enhance the cleaning effect on the membrane surface of the membrane separation device. [Structure] A ribbon 2 having flexibility by inserting each flow path 20 between adjacent ceramic membrane elements 7a in the vertical direction.
1 was arranged and each ribbon 21 was fixed to the fixing member 22 at the upper end and the lower end.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for suppressing the adhered substance on the membrane surface in a membrane separation device, which suppresses the formation of a cake layer due to the adhered substance on the membrane surface.

[0002]

2. Description of the Related Art Conventionally, as a solid-liquid separation device using a membrane, there is one related to water purification treatment as shown in FIGS. In FIG. 3 to FIG. 5, while raw water 3 is supplied from the raw water supply pipe 2 into the water tank 1, air supplied from the stirring blower 4 is aerated through the air diffuser 5. The membrane separation device 6 arranged above the air diffuser 5 has a plurality of tubular ceramic membrane elements 7a arranged at appropriate intervals, and the end portions of each ceramic membrane element 7 are joined by a header 8 to form a membrane module. 7 is formed.

At the time of filtration, a negative pressure by a suction pump 10 is applied to the membrane separation device 6 through a suction pipe 9, and the ceramic membrane element 7a solid-liquid separates the suspended matter contained in the raw water 3 and suction-filters the permeated water. The LF is taken out of the system via the suction pump 10. The air aerated from the air diffuser 5 causes an upward flow UF of a gas-liquid mixed flow of raw water and air due to its air lift action, and this upward flow passes between the membrane surfaces of the membrane separation device 6 and the inside of the water tank 1 And also acts as a sweep flow on the film surface to suppress the growth of the cake layer on the film surface.

[0004]

However, in the above-described conventional structure, while the upward flow acts as a sweep flow on the membrane surface of the ceramic membrane element 7a of the membrane separation device 6, the ceramic membrane element 7a There is a problem in that the upward flow acts as a resistance against the upward flow, the upward flow becomes a turbulent flow in the membrane separation device 6, and the upward flow effectively acts as a sweep flow. Therefore, there is a problem that the power cost of the stirring blower 4 becomes high in order to secure a certain cleaning effect on the film surface.

The present invention solves the above-mentioned problems.
An object of the present invention is to provide a device for suppressing deposits on the membrane surface in a membrane separation device, which can enhance the cleaning effect due to upward flow.

[0006]

In order to solve the above-mentioned problems, the device for suppressing the deposits on the membrane surface in the membrane separation device of the present invention has a plurality of membrane elements arranged with appropriate gaps and adjacent membranes. In a membrane separation device that cleans the membrane surface by passing a sweep stream consisting of a gas-liquid mixed flow through the vertical channels formed between the surfaces, vertically inserting each of the channels between adjacent membrane surfaces. Flexible ribbons are arranged and each ribbon is fixed to a fixing member at the upper and lower ends.

[0007]

With the above-described structure, the upward flow flows as a sweep flow through the flow path formed between the membrane elements of the membrane separation device to wash away the filtered material adhering to the membrane surface and to grow the cake layer on the membrane surface. Suppress. At this time, the ribbon arranged between the membrane elements is swayed by the flow of the upward flow, and the action of the ribbon acts to hit the deposit on the membrane surface by the swing, and continuously removes the deposit on the membrane surface. .

For this reason, it is possible to suppress the adherence of the filtered material to the membrane surface due to the sweeping flow, and to remove the adhered material attached to the membrane surface by the ribbon, so that the cleaning effect can be enhanced as compared with the conventional case. The driving force required for cleaning can be reduced.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. Members having the same functions as those described above with reference to FIGS. 3 to 5 are designated by the same reference numerals and the description thereof will be omitted. 1 to 2, the membrane separation device 6 is formed by stacking a plurality of membrane modules 7 on top of each other, and each membrane module 7 is formed by connecting end portions of a plurality of ceramic membrane elements 7a with a header 8.

Each ceramic membrane element 7a is arranged with an appropriate gap, and a vertical passage 20 is formed between the membrane surfaces of adjacent ceramic membrane elements 7a. A plurality of ribbons 21 are arranged by vertically penetrating each of the flow paths 20, and the ribbons 21 are made of a resin material, a metal foil, or the like and have flexibility. Each ribbon 21 is fixed to a band-shaped fixing member 22 at the upper and lower ends.

According to this structure, during filtration, the suspended matter contained in the raw water 3 is solid-liquid separated by the ceramic membrane element 7a, and the membrane-permeated water LF suction-filtered is taken out of the system via the suction pump 10. On the other hand, the upward flow UF generated by the air aerated from the air diffuser 5 circulates in the water tank 1 through the flow path 20 between the membrane surfaces of the ceramic membrane element 7a, and acts as a sweep flow on the membrane surface. This suppresses the growth of the cake layer on the film surface.

At this time, the ribbon 21 arranged between the adjacent ceramic membrane elements 7a is swayed by the upward flow, and the oscillating movement causes the ribbon 21 to strike the deposit on the membrane surface. The deposits on the surface are constantly removed.

In this embodiment, the tubular membrane module has been described, but it can be applied to a flat membrane module.

[0014]

As described above, according to the present invention, it is possible to suppress the adherence of the filtered material to the film surface by the sweep flow and to remove the adhered material adhered to the film surface by the ribbon. As a result, the cleaning effect can be enhanced and the driving force required for cleaning can be reduced.

[Brief description of drawings]

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

FIG. 2 is a cross-sectional view of the membrane separation device in the same example.

FIG. 3 is a schematic diagram showing a configuration of a conventional membrane separation device.

FIG. 4 is a perspective view of a conventional membrane separation device.

FIG. 5 is a schematic view showing a filtering action in a conventional ceramic membrane element.

[Explanation of symbols]

 1 Water Tank 3 Raw Water 5 Diffuser 6 Membrane Separation Device 7 Membrane Module 7a Ceramic Membrane Element 10 Suction Pump 20 Flow Path 21 Ribbon

Claims (1)

[Claims] 1. A membrane surface is cleaned by arranging a plurality of membrane elements with appropriate gaps, and passing a scavenging flow consisting of a gas-liquid mixed flow through a vertical flow path formed between adjacent membrane surfaces. In the membrane separation device, a flexible ribbon is arranged by vertically inserting the respective flow paths between adjacent membrane surfaces, and each ribbon is fixed to a fixing member at an upper end and a lower end. A device for suppressing film surface deposits in a separation device.