JPH0780251A - Micro-filtering apparatus - Google Patents

Abstract

PURPOSE:To provide a micro-filtering apparatus using a ceramic membrane and capable of simply washing and regenerating a filter medium. CONSTITUTION:A floatable granular filter medium is supplied in a filter tank 1 and a filter cylinder 3 using a ceramic membrane is embedded in the filter medium bed formed by the granular filter medium so that a filtrate is taken out of the hollow part of the filter cylinder 3 and the stirrer 4 of the granular filter medium is installed under the filter medium bed 2. A supplied raw soln. is passed through the granular filter medium to separate impurities in the raw soln, and the fine solid in the raw soln. is further removed by the filter cylinder 3. When the granular filter medium and the filter cylinder 3 are clogged, by stirring the granular filter medium, the clogging substance of the granular filter medium and the filter cylinder can be removed at a stroke.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a microfiltration device using a ceramic membrane.

[0002]

2. Description of the Related Art Conventionally, a microfiltration device using a ceramic membrane is well known. That is, as shown in FIG. 2, a microfiltration device is generally used in which a filtrate filtered by a sand filter is introduced into a filtration tank in which a large number of hollow external pressure type ceramic membranes are suspended and filtered. Then, when the ceramic membrane is clogged, in order to wash and regenerate it, backwash air or backwash water is made to flow over the surface of the ceramic membrane as shown in FIG.

[0003]

However, the conventional microfiltration apparatus as described above require a filtration apparatus such as a sand filtration apparatus before the microfiltration, and the filter media of these filtration apparatuses are clogged. Occasionally, cleaning and regeneration are required for each. Further, in the above-described cleaning and regeneration of the ceramic membrane, the surface of the ceramic membrane is simply made to flow a fluid of backwash water or backwash air, so that complete washing is difficult.

[0004]

SUMMARY OF THE INVENTION The present invention can solve the above-mentioned problems all at once, and does not require a pretreatment filtration device to perform microfiltration at once in one filtration tank. It is possible to regenerate even when the filter medium is clogged, and the main point is that the filter medium layer formed by the granular filter medium is formed in the filtration tank filled with the floating granular filter medium. A filter tube made of ceramic membrane that is buried in the filter, and the filtrate is taken out of the tank from the hollow part of the filter tube, and a stirring device for the filter layer is installed below the filter layer. Is.

[0005]

The apparatus according to the present invention is constructed as described above. First, the undiluted solution supplied to the filtration tank is subjected to trapping and removal of impurities by the granular filter medium layer, and then the fine solids are filtered by the filter tube. Is removed, and the filtrate can be taken out of the tank through the hollow portion of the filtration cylinder. Then, when the granular filter medium layer and the filter tube are clogged, the granular filter medium layer is loosened by stirring the granular filter medium layer by the agitator, and the foreign substances clogged between the particles are separated and disturbed. The granular filter medium collides with the membrane surface of the filter cylinder to remove the adhered solid matter, and the filter cylinder can be regenerated at the same time. The separated contaminants and solids are separated from the granular filter medium by the discharging means provided in the filtration tank and discharged outside the tank. Hereinafter, the present invention will be specifically described with reference to the drawings.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG. 1, reference numeral 1 is a filter tank, 2 is a filter medium layer formed by a filled granular filter medium, 3 is a filter cylinder made of a ceramic membrane suspended in the filter medium layer 2, and 4 is a filter tank. A stirring blade provided at the bottom of 1 is a supply pipe for the stock solution, 6 is a discharge pipe for the filtrate, and 7 is a discharge pipe for washing water.

The apparatus according to the present invention is constructed as described above, and the granular filter medium is floated in the filter tank by supplying the undiluted solution, and the filter medium layer 2 is provided around the filter cylinder 3 so as to wrap it. To form. In the undiluted solution supplied from the supply pipe 5 into the filtration tank 1, impurities are captured while passing through the filter medium layer 2, and then a fine solid matter is further captured by the ceramic membrane of the filtration cylinder 3 to obtain a clean filter. The liquid can be obtained from the discharge pipe 6.

When the ceramic membranes of the filter medium layer 2 and the filter cylinder 3 are clogged in such an operation, the supply of the undiluted solution and the withdrawal of the filtrate are stopped, and the stirring blade 4 is driven to drive the flowing water flow. Then, the filter medium layer 2 is loosened, the foreign substances clogged between the granular filter media are peeled off, and the flowing filter medium collides with the surface of the ceramic membrane to peel off the minute solid matter adhering to the surface of the ceramic membrane of the filtration cylinder 3. can do. That is, the filter medium layer 2 formed of the floating filter medium and the ceramic film can be renewed at the same time.
Since the contaminants and solids separated as described above are taken out of the tank through the discharge pipe 7, in this case, by opening the valve 7a of the drain pipe 7, the contaminants and solids heavier than the granular filter medium are removed. The granular filter medium does not flow away because it settles into the pit 7b first.

Further, in order to effectively act the water flow in the tank by the stirring blade 4 on the ceramic membrane on the surface of the filtering cylinder 3 which depends, the up and down water flow is optimum. For this purpose, the stirring blade 4 itself Although the shape may be such that a vertical water flow occurs,
A guide tube 4a may be provided as shown in FIG. further,
Since the granular filter medium collides with the ceramic film to remove the clogging, it is necessary to have a floating filter medium function, but it is preferable that the granular filter medium be as heavy and strong in inertia as possible.

[0010]

As described above, the device according to the present invention can perform the microfiltration by simultaneously performing the primary filtration and the secondary filtration in one filtration tank as compared with the conventional microfiltration device of this type. And, when the filter medium becomes clogged, it is possible to wash and regenerate the filter medium for these two-stage filtration all at once, and it is possible to solve the conventional problems in terms of production cost and running cost such as operation. is there.

[Brief description of drawings]

FIG. 1 is a schematic vertical sectional side view of a microfiltration device according to the present invention.

FIG. 2 is a schematic vertical sectional side view of a conventional microfiltration device of this type.

FIG. 3 is likewise a schematic vertical cross-sectional side view of the precision filter part.

FIG. 4 is a schematic vertical cross-sectional view of a filtration tank for explaining a cleaning flow of a filter medium in the microfiltration device according to the present invention.

[Explanation of symbols]

 1 Filter Tank 2 Filter Material Layer 3 Filter Cylinder 4 Stirrer

Claims (1)

[Claims] 1. A filter cylinder (3) made of a ceramic membrane is suspended in a filter tank (1) filled with a buoyant granular filter medium so as to be buried in a filter medium layer (2) formed by the granular filter medium, and a hollow portion of the filter cylinder (3). A microfiltration device in which the filtrate is removed from the tank and a stirring device 4 for the filter material layer 2 is installed below the filter material layer.