JP2629667B2 - Filtration device using flat membrane filter media - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filtration device for a stock solution containing fine particles, and more particularly to an improvement in a filtration device using a so-called ultrafiltration membrane capable of capturing particles of about 10 microns as a filter medium. In particular, it is an object of the present invention to provide a filtration device which can easily regenerate an ultrafiltration membrane which has been difficult to regenerate when clogged.

[0002]

2. Description of the Related Art Conventionally, a filtration device using a membrane-shaped filter medium having fine through holes is known, and Japanese Utility Model Application Laid-Open No. 3-11426 is one example of such a filtration device. Japanese Patent Application Laid-Open (JP-A) Nos. 64-7910, 3-18
8928 and the like.

[0003]

However, Japanese Utility Model 3
Japanese Patent Application Laid-Open No. 64-7910 only discloses one structure of a membrane module using a flat membrane-shaped filter medium.
In Japanese Patent Application Laid-Open No. HEI 3-18828 and JP-A-3-18828, the filter plates parallel to each other are fixed to each other. Therefore, when the filter media is clogged, a chemical solution or the like is injected into the disassembled or mounted filter media (membrane module). It is difficult to completely regenerate the filter media without washing. In addition, even when performing maintenance, the entire apparatus must be disassembled, which requires time and effort.

[0004]

SUMMARY OF THE INVENTION The present invention can solve the above-mentioned conventional problems, and the gist of the present invention is to provide a large number of filter units having at least one surface provided with a hollow filter bed. A plate-shaped filter plate is movably arranged along the guide rod, and when these filter plates are closed, a filtration chamber is formed between the filter plates by a filtration membrane stretched on the filtration bed, and the filter plate is formed. , said supply path of the stock solution communicating with the filtration chamber, and the filtrate extraction passage opening into the filtration bed of the back of the filtration membrane, a filtration device which is disposed a removal path of the concentrate which opens into the filtration chamber
At the filter membrane on the filter bed of the filter plate
A metal mesh is placed and the metal mesh is
Place the punching metal and filter this punching metal
It is fixed to the periphery of . Then, a washing nozzle is provided around the filter plate when opened, toward the filtration membrane stretched over the filter plate.

[0005]

The apparatus according to the present invention is configured as described above, and the stock solution supplied to the filtration chamber is included in the stock solution.
Coarse particles are separated by metal mesh, metal mesh
Fine particles and organic matter that are not assisted by
You. Then, the filtered filtrate is collected through a filtration bed into a filtrate taking-out path and taken out of the apparatus. The undiluted solution separated and concentrated by the filtrate is taken out of the device via a passage for taking out the concentrated solution. That is, the stock solution supplied to the filtration chamber is automatically filtered and separated into a concentrate and a filtrate by the filtration membrane.For example, when only the filtrate is required, the concentrate is returned to the stock solution tank. For example, it can be combined with an untreated stock solution and treated. During the filtration operation, according to the present invention, since the stock solution is filtered while flowing on the filtration membrane surface, there is an advantage that the filtration membrane surface is washed and clogging is prevented.

[0006] When the clogging of the filtration membrane reaches the limit by performing the filtration operation as described above, the apparatus according to the present invention comprises:
Since each filter plate is opened and closed, the filtration chamber can be opened by opening each filter plate. Therefore, the filtration membrane surface stretched over each filter plate can be directly washed with washing water or the like. In addition, the clogging which is difficult to remove only by the surface cleaning is removed by backwashing the filtration membrane by injecting washing water or a chemical solution from the outlet of the filtrate with each filter plate closed. be able to. That is, in the apparatus according to the present invention, the clogged filtration membrane can be washed from the front and the back, and the filtration membrane can be easily regenerated , and the filtration membrane and the metal mesh can be separated from each other.
Since the metal has been placed and reinforced,
The filter medium is not damaged by back pressure. Hereinafter, the present invention will be specifically described with reference to the drawings.

[0007]

1 and 2, reference numeral 1 denotes a frame, 2 denotes a guide rail bridged between the frames 1, 1 and 3;
Is a filter plate movably mounted on a guide rail, 4 is a link chain connecting each filter plate, 5 is a movable head, 6 is a hydraulic cylinder for tightening the filter plate 3, and the filter plate shown in FIG. It also has the role of opening and closing 3. In FIG. 2, the filter plate 3 is opened and closed by an endless chain 15 .

Next, the configuration of the filter plate will be described with reference to FIG. 3. In FIG. 3, reference numerals 3a denote recesses provided respectively on both sides of the filter plate 3, and fine recesses provided on the bottom surface thereof. A filtration bed 3b composed of a groove is provided, and a supply path 3c for the stock solution and a supply port 3d for communicating the supply path 3c with the recess 3a are provided at the upper part. In the lower part of the filter plate 3,
Filtrate take-out path 3e and recess 3a communicating with filtration bed 3b
A supply path 3f for the concentrate, a supply path 3c for the undiluted solution, a path 3e for the filtrate, a path 3e for the concentrate
f is such that when the filter plate 3 is closed, they are connected and connected. 1 and 2 conceptually show this state. In the figures, reference numeral 7 denotes a stock solution storage tank,
Reference numeral 8 denotes a supply pump, 9 denotes a filtrate receiving tank, and reference numeral 14 denotes a washing tube provided above the row of filter plates, and a nozzle 14a is provided toward a filtration membrane of the opened filter plate.

Next, the structure of the filter device provided on the filter plate will be described in detail with reference to FIG.
Is a plate-shaped filtration membrane stretched on the filtration bed 3b, and an ultrafiltration membrane is used in the illustrated one. Reference numeral 11 denotes a metal mesh stretched on the filtration membrane, 12 denotes a punching metal provided on the metal mesh 11, and 13 denotes a filter for fixing the filtration membrane 10, the metal mesh 11, and the punching metal 12 to the filter plate 3. It is a presser foot. Filter media portion be configured to this, when the filter plate 3 and the closing plate is provided with a filter membrane 10 to the wall before and after each filtration plates were arranged on a flat double
Since 3g of filtration room is formed with metal mesh 11,
The coarse particles in the stock solution are separated by a metal mesh 11 and
Filter fine particles and organic matter that have passed through the mesh
Separation at the supermembrane 10 and the filtration membrane 10 is clogged.
It is hard to make it easy.

The apparatus according to the present invention is constructed as described above. The stock solution supplied from the storage tank 7 by the pump 8 to the filtration chamber 3g via the supply path 3c is supplied to the metal mesh 11
And the filtrate is filtered by the filtration membrane 10, and the filtrate is filtered by the filtration bed 3b.
Through the outlet path 3e, and can be taken out of the apparatus. On the other hand, the concentrated liquid from which the filtrate has been separated is collected in the discharge path 3f, returned to the storage tank 7, merged with the undiluted liquid, supplied again to the filtration chamber, and filtered. That is, the undiluted solution supplied to the storage tank 7 is separated into a filtrate and a concentrated undiluted solution by the filtration membrane 3 in the filtration chamber 3 g formed between the filter plates 3. Then, the circulating stock solution
Metal mesh 1 flows on metal mesh 11
The first mesh is less likely to be clogged, a long-time continuous filtration operation is possible, and the filtration efficiency is extremely high.

[0011] As described above, when the filtration membrane 10 is clogged is a device according to the present invention, by Kaihan the filter plates 3, it is possible to open the filtration chamber 3g, metal mesh nozzle 14a The cleaning liquid can be directly sprayed on the surface of the substrate 11 for cleaning. In this cleaning operation, the surface of the metal mesh 11 can be exposed by the operation of opening the filter plate 3 according to the present invention. Therefore, compared with the conventional disassembly, the membrane module is taken out and washed. The operation is simple.

[0012] Then, in the case of the backwash cleaning, each filter plate and the closing plate, by sending a backwash liquid of the washing water or the chemical liquid from the extraction path 3e of the filtrate, the filtration membrane 10 is backwashed ,
Fine particles and organic matter attached to the filtration membrane 10 are metal mesh
The washing wastewater that has been pushed back into the filtration chamber through the mesh of the screen does not return to the storage tank 7 via the supply path 3c of the undiluted solution.
It may be separated and taken out separately. This backwashing filter plate 3
It is simple because it only needs to close the plate and feed the washing solution into the filtration chamber 3g, especially in the case of backwashing , punching for reinforcement
Metal 12 is disposed on the entire surface of metal mesh 11
Therefore, the filtration membrane and metal mesh may be damaged by back pressure.
And there is nothing. Since the cleaning is performed in the closed state, the cleaning liquid does not scatter, etc., and the chemical can be used safely. In addition, it is possible to completely remove even the clogging that has entered the minute eyes of the filtration membrane 10. it can.

[0013]

As described above, the filtering device according to the present invention can completely regenerate the clogged filter medium (filtration membrane) by washing it from the front and back, and the washing and regenerating operation is the same as the conventional one. Compared to the operation of washing and regenerating this kind of filter media,
Ru much easier der. That is, a metal mesh is placed over the filtration membrane.
Since the filter is installed, clogging of the filtration membrane can be prevented,
Filtration time becomes longer, and these media
And the back pressure during backwashing
Can withstand pressure, and this type of membrane filtration device
Problem was solved.

[Brief description of the drawings]

FIG. 1 is a schematic side view of a filtration device according to the present invention, in which a flow of a stock solution to be processed is schematically shown.

FIG. 2 is also a schematic side view of another embodiment,
The flow of the stock solution to be processed is schematically shown.

FIG. 3 is a vertical sectional side view showing a filtration chamber which is a main part of the present invention.

[Explanation of symbols]

2 Guide rail 3 Filter plate 3b Filtration bed 3c Undiluted solution supply path 3e Filtrate removal path 3f Concentrate removal path 10 Filtration membrane 11 Metal mesh 12 Punching metal 14a Cleaning nozzle

Claims (2)

(57) [Claims] 1. A filter bed 3 having a concave shape on at least one surface thereof.
b are arranged movably along the guide rod 2, and when these filter plates 3 are closed, the filter plates 3.
A filtration chamber is formed between the filtration membranes 3 by the filtration membrane 10 stretched over the filtration bed 3b, and the filter plate 3 has a supply path 3c for the undiluted solution communicating with the filtration chamber, and a filtration bed on the back of the filtration membrane 10. A filtration device provided with a filtrate take-out passage 3e opening at 3b and a concentrate take-out passage 3f opening at the filtration chamber.
The filtration membrane 10 stretched over the filtration bed 3b of the filter plate 3
Dispose the metal mesh 11 on the top, this metal mesh
Place punching metal 12 on top of
A filtering device using a flat membrane-shaped filter medium, characterized in that the chucking metal 12 is fixed at the periphery of the filter plate 3 . 2. A flat membrane characterized in that when a large number of filter plates 3 according to claim 1 are opened, a washing nozzle 14a is provided toward a filtration membrane 10 stretched over a filtration bed 3b. Filtration device using a filter medium.