JP2004033974A - Filter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a filter, in which filter cake accumulated on a filter cloth can be released and removed simply. <P>SOLUTION: A port 10 is provided at the top of a vessel body 2 through which filtrateis discharged and washing liquid is injected. A filter-cake discharge port 11 is provided in the bottom, and an injection port 13 for liquid to be treated is provided on the side of the port 11. A porous support 6 for filter-cloth is provided inside the upper half part 2A of the vessel body 2. A bag filter cloth 8 is provided inside the support 6. The filter cloth 8 is attached so as to be turned inside out by fixing a peripheral edge 9 of the lower opening of the filter cloth 8 to the intermediate part of the vessel body 2. In the filtration, from the port 13, liquid to be treated is injected into the body 2 for filtration with the filter cloth 8. After the filtration, washing liquid is force fed from the port 10 into the vessel body 2 so that the filter cloth 8 is bulged inside out by the pressure to the lower part. Consequently, filter cake C adhering in accumulation to the filter cloth 8 is crushed and washed out. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a filter used for a solid-liquid separation process of, for example, a construction waste soil slurry, a plating plant waste liquid treatment product, and excess sludge slurry discharged in a waste liquid activated sludge treatment step.
[0002]
[Prior art]
Conventionally, as shown in FIG. 3, a to-be-processed liquid inlet (23) is provided at an upper end of a can (21) having a lid (22) attached thereto, and a filtrate outlet (24) is provided at a lower end. (21) There is provided a filter (27) in which a porous filter cloth support (25) is mounted inside and a filter cloth (26) is further mounted inside the porous filter cloth support (25).
[0003]
In order to perform the solid-liquid separation treatment with the filter (27), the liquid to be treated is press-fitted from the liquid inlet (23) at the upper end, and the liquid to be treated is subjected to solid-liquid separation by the filter cloth (26). The solids in the liquid to be treated accumulate and adhere to the filter cloth (26) as filter cake C, and the filtrate passes through the filter cloth (26) and is discharged from the filtrate discharge port (24).
[0004]
[Problems to be solved by the invention]
In the filter (27), the filter cloth (26) is removed after filtration to remove and remove the filter cake C accumulated in the filter cloth (26). It was very time-consuming.
[0005]
[Means for Solving the Problems]
According to the present invention, as a means for solving the above-mentioned conventional problems, a filtrate discharge washing liquid inlet (10) is provided at an upper end of a can body (2), a filter cake discharge port (11) is provided at a lower end, and a side portion thereof is provided. An inlet for liquid to be treated (13) is provided, a porous filter cloth support (6) is provided inside the upper half (2A) of the can body (2), and a porous filter cloth support (6) is provided inside the can (2). A bag-like filter cloth (8) is arranged, and the filter cloth (8) is turned upside down by fixing the periphery (9) of the lower end opening of the filter cloth (8) to the middle of the can body (2). A filter (1). It is desirable that the can body (2) can be divided into upper and lower parts.
[0006]
[Action]
The liquid to be treated is press-fitted into the can (2) from the liquid inlet (13) at the lower end. The filter cloth (8) bulges upward due to the pressure input of the liquid to be treated, and presses against the porous filter cloth support (6) in the upper half (2A). The solid content in the liquid to be treated accumulates as filter cake C inside the filter cloth (8), and the filtrate passes through the outside of the filter cloth (8) and is discharged from the filtrate discharge washing liquid inlet (10). Is done.
After the completion of the filtration, the washing liquid is injected under pressure from the filtrate discharge washing liquid inlet (10). The filter cloth (8) bulges upside down to the lower half (2B) side due to the pressure input of the cleaning liquid, and at this time, the filter cake (C) naturally peels off from the filter cloth (8) and the outside of the filter cloth (8). Is extruded by the washing liquid passing through the filter body and discharged from the filter cake discharge port (11) of the can body (2).
[0007]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the present invention will be described in detail.
The present invention will be described with reference to one embodiment shown in FIGS. 1 and 2. The can body (2) of the filter (1) is divided into an upper half (2A) and a lower half (2B). The upper half (2A) and the lower half (2B) abut the flanges (3A, 3B) and are fixed by bolts (4) and nuts (5).
[0008]
A porous filter cloth support (6) such as a net or punched metal is attached inside the upper half (2A). The porous filter cloth support (6) has a lower end flange (7) sandwiched and fixed between the upper half (2A) and lower half (2B) flanges (3A, 3B) of the can body (2). . Furthermore, a bag-like filter cloth (8) is stretched inside the porous filter cloth support (6), and the periphery of the opening (9) of the filter cloth (8) is also placed on the can body (2). It is sandwiched and fixed between the flanges (3A, 3B) of the half (2A) and the lower half (2B).
[0009]
At the upper end (2A) of the upper half (2A) of the can body (2), a filtrate discharge washing liquid inlet (10) is provided, and at the lower end of the lower half (2B), a filter drain outlet provided with a valve (12). (11) is provided, and a liquid to be treated inlet (13) provided with a valve (14) is provided at a side portion thereof.
[0010]
In the filter (1) having the above configuration, the valve (14) is opened, and the liquid to be treated is pressed into the can (2) from the liquid inlet (13). The injection of the liquid to be treated is performed by a pump (not shown). In the can (2), the liquid to be treated pushes up the filter cloth (8) upward as shown in FIG. 1 by pressure input to swell, and is pressed against the porous filter cloth support (6). The liquid to be treated is filtered by the filter cloth (8), and the solid content dispersed in the liquid to be treated is accumulated as filter cake C inside the filter cloth (8), and the filtrate passes through the filter cloth (8) outside. And discharged from the filtrate discharge washing liquid inlet (10) at the upper end of the can body (2).
[0011]
After the filtration step, the washing liquid (for example, water) is pressed into the can (2) from the filtrate discharge washing liquid inlet (10). As shown in FIG. 2, the filter cloth (8) is turned upside down and swells due to the pressure input of the cleaning liquid. At this time, the filter residue C accumulated and adhered to the inside of the filter cloth (8) is crushed and peeled off by the inside-out force, and is further removed by being washed away by the pressure of the washing liquid passing outside. The filter cake C thus removed from the filter cloth (8) is discharged from the filter cake discharge port (11) by opening the valve (12).
[0012]
【The invention's effect】
In the present invention, the filter cake accumulated on the filter cloth can be naturally removed without removing the filter cloth from the can body.
[Brief description of the drawings]
1 and 2 show an embodiment of the present invention.
FIG. 1 is a cross-sectional view for explaining a filtration step. FIG. 2 is a cross-sectional view for explaining a filter cake removing step. FIG. 3 is a cross-sectional view for explaining a conventional filtration step.
DESCRIPTION OF SYMBOLS 1 Filtration device 2 Can body 2A Upper half 6 Perforated filter cloth support 8 Filter cloth 9 Periphery of opening 10 Filtrate discharge washing liquid inlet 11 Filtrate discharge port 13 Treatment liquid inlet

Claims (2)

A filtrate discharge washing liquid inlet is provided at the upper end of the can body, a filter cake discharge port is provided at the lower end, and a liquid to be treated is provided at the side thereof, and a porous filter cloth support is provided inside the upper half of the can body. A bag-like filter cloth is arranged inside the porous filter cloth support, and the filter cloth is attached so that it can be turned upside down by fixing the periphery of the lower end opening of the filter cloth to the middle of the can body. Filter The filter according to claim 1, wherein the can body can be divided into upper and lower parts.

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