JPH07313809A - Filter device - Google Patents

Abstract

PURPOSE:To easily, rapidly and surely remove the suspended matter collected on the surface of a filter medium or in the medium by simple backwashing by fixing a partition plate to divide the lower surface of a filter medium supporting plate into plural sections to the lower surface and arranging a cleaning air inlet pipe in each section. CONSTITUTION:An inlet pipe 9 for a liq. to be filtered, a treated liq. outlet pipe 8, a cleaning water inlet pipe 7 and a filter medium supporting plate 2 are arranged in the main body 1 of a filtration tank, and a fibrous filter medium 4 is laminated on the supporting plate 2 to form a filter medium bed. In this filter device, a partition plate 3 to divide the lower surface of of the plate 2 into plural sections is fixed to the lower surface, and a cleaning air inlet pipe 6 is arranged in each section under the plate 2. The filter medium 4 is formed by bundling many cut crimped fibers, binding the center of the bundle and forming the bundle into an almost globular shape. The suspended matter collected on the surface of the medium or in the medium is easily, rapidly and surely removed by simple backwashing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a spherical fibrous filter material laminated on a filter tank to remove fine solids suspended in waste water, water, etc. The present invention relates to a filtration device that is designed to be removed by filtration.

[0002]

2. Description of the Related Art This type, a filter material for removing fine solids from suspended waste water, water, etc., has a high porosity and the treated water penetrates well into the inside and has a specific surface area. Large internal collection efficiency and effective treatment
It is important that not only the backwashing performance is excellent, but also the backwashing performance that easily removes the solid content collected from the filtration material is excellent. As a suitable material for this,
A fiber lump in which fibers are formed in a spherical shape is used. Tokusho Sho 6
The one disclosed in Japanese Patent Laid-Open No. 2-55885 is known as a filtration device using the same, but this known technique is merely a lamination of fiber lumps, and backwashing is also a filtration material layer. It is a means to clean from below, and no further improvement is done. In this way, the method of simply bubbling the cleaning material from the bottom of the filter material layer to the entire surface uniformly with the cleaning air was also conducted by the inventor of the present invention. The apparent specific gravity of the water decreased, and the filter material settled on the contrary rather than floated, and the filter material did not move at all, stirring did not occur at all, and cleaning could not be performed. It was confirmed that as the flow rate of the cleaning air increased, it settled and that it occurred even when the specific gravity of the filtration material was small. However, this filtration device of the known technique is capable of bubbling with cleaning air and flowing cleaning water at the same time that the surface of the filtration material is slightly cleaned, and practical cleaning is expected. It cannot be done. In Japanese Patent Publication No. 4-67323, which is a prior art of the filtration apparatus which improves this, the filtration liquid inflow pipe is exposed above the filtration tank main body, and the treatment liquid outflow pipe is exposed below. ▲ Ro ▼ The rising and falling sections are provided by the partition plate that is vertically partitioned inside the main body of the tank, and the filter material support plate is placed below the partition plate to remove the spherical fiber filter material. (1) A filter material is laminated on the filter material support plate to form a filter material layer, and a cleaning air inflow pipe and a cleaning water inflow pipe are arranged below the rising section, and further below the filter material support plate. A flow direction adjusting plate is attached, and backwashing operation is performed by allowing the spherical fiber filter material to circulate between the ascending section and the descending section.
A transposition device is disclosed.

[0003]

[Problems to be Solved by the Invention] However, this ▲
The filtration device is a little complicated in structure, and it is located at the bottom of the descending section due to the ratio of the sectional areas of the ascending section and the descending section
In some cases, the excess material does not circulate reliably and smoothly, such as compression of the excess material or swirling in the ascending section. Therefore, in view of the above-mentioned problems of the prior art, as a result of various investigations on cleaning means to solve the problems, the present invention shows that bubbling with cleaning air is concentrated not on the entire surface of the overlayer but on a part thereof. By doing so, the entire filtration layer is formed in an ideal agitated state, and the filtration material is circulated along with this intense circulation flow, so that the surface of the spherical fibrous filtration material and It has excellent backwashing performance that can easily and quickly remove the suspension trapped inside easily and quickly by a simple backwashing operation, and even if the backwashing operation is repeated, the filter material is denatured for a long time. It is an object of the present invention to provide a filtration device having a simple structure that can continue the filtration without performing the filtration.

[0004]

Means for Solving the Problem As a means for solving the above problems, the present invention provides: a filtration tank main body, a filtration liquid inflow pipe, a treatment liquid outflow pipe, a wash water inflow pipe, and a filtration filter. Each material support plate is arranged, and the fibrous filter material is laminated on the filter material support plate to form a filter material layer. A partition plate for dividing the lower surface of the filter material support plate into a plurality of sections is attached to the lower surface of the plate, and a cleaning air inflow pipe is arranged in each of the divided sections below the filter material plate. Is a fibrous filter material formed by bundling a large number of cut crimped yarns, bundling the central part thereof, and molding it into a substantially spherical shape.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention shown in the drawings will be described in detail below. 1 to 3 show a first embodiment of the present invention, in which the filtration tank body 1 is formed into a cylindrical shape as shown in FIG. 2 or a rectangular tube shape as shown in FIG. ▼
A filtration material support plate 2 made of a porous material is horizontally stretched in the filtration tank body 1. The filtering material support plate 2 is made of punching metal, wire mesh, or the like, and it is preferable that the opening ratio is as large as possible and the size of the hole is as large as possible so that the filtering material does not pass through. Then, a large number of fibrous filter materials 4 are laminated on the filter material support plate 2 to form a filter material layer. The fibrous filter material 4 is a spherical fibrous filter material, that is, vinylidene chloride-based yarn, polyvinyl chloride, polyethylene, as disclosed in Japanese Patent Publication No. 4-67323 of the prior art mentioned above. A series of thin synthetic fiber yarns having a thickness of 20 to 200 denier and 2 to 10 times / inch crimps are made into a bundle, and the central portion thereof is squeezed. , A synthetic fiber yarn having rigidity, a hard plastic band, a metal wire having corrosion resistance and corrosion resistance, etc., is used so that the binding portion is rounded so as to be embedded in the center. Further, by arranging a partition plate 3 that hangs downward by about 10 cm to 20 cm at the center of the lower surface of the filter material support plate 2, the lower surface of the filter material support plate 2 is divided into two sections 5, 5. To form. Further, the cleaning air inflow pipe 6 is arranged in each of the divided compartments 5, the cleaning water inflow pipe 7 is arranged in the lower part of the filtration tank body 1, and the treatment liquid outflow pipe 8 is attached as in the prior art. (1) The filtered excess liquid inflow pipe 9 is exposed above the inside of the excess tank body 1, and the cleaning water discharge pipe 10 is attached. Further, the cleaning water inflow pipe 7 is installed below the filter material support plate 2, but since a gentle flow is generated below the filter material support plate 2, it may be provided at any one position. .

With the above-mentioned structure, in order to perform the over-operation, the filtered excess liquid is filtered by the excess liquid inflow pipe 9
From (1), it flows into the upper part of the excess tank body 1. The filtrate to be filtered flows downward in the layer of the fibrous filter material 4, and after the suspended matter is removed, it is discharged through the treatment liquid outflow pipe 8. When the suspension is sufficiently trapped in the layer of the fibrous filter material 4 and the overpressure loss of the filter increases, the inflow of the filtered liquid is stopped and the washing process is started. The treatment liquid outflow pipe 8 is closed, and the wash water or the water to be treated is continuously or intermittently introduced from the wash water inflow pipe 7, and at the same time, the air is introduced from the wash air inflow pipe 6 arranged in one of the compartments. As described above, bubbling with the cleaning air concentrated on a part causes a large difference in density between the bubbling part and the non-bubbling part in the filtration tank. As a result, an upflow occurs in the bubbling portion and a downflow in the non-bubbling portion, resulting in a strong circulating flow in the entire filtration tank. It is circulated along with a strong circulation flow, and is subjected to a strong stirring action to be effectively washed. In this case, if the cleaning air is supplied to only one side, the stagnation of the slag is likely to occur on the upper surface of the spilling material support plate 2 on the descending flow side and on the portion near the sewage tank wall. By changing the flow direction of the circulation flow of the backwash by alternately operating the wash air inflow pipe 6 of 1 by a timer, the entire filtration tank can be ideally stirred. The washing of the fibrous filter material 4 proceeds while the cycle is repeated and circulated. The end of cleaning is automatically performed by setting a cleaning time in advance or by detecting the concentration of cleaning water. When the cleaning is completed, the inflow of air or cleaning water is stopped, the processing liquid outflow pipe 9 is opened again, and the filtration step is started.

FIGS. 4 to 6 show a second embodiment of the present invention, in which the filtration tank body 1 is formed in a cylindrical shape as shown in FIG. 5 or a rectangular tube shape as shown in FIG. With partition plate 3
Although the lower surface of the filter material support plate 2 is divided into two, this is an example in which the cleaning air inflow pipe 6 is omitted in only one place and the other is omitted, which is suitable for a small size. That is, the partition plate 3 divides the partition of the lower surface of the filter material support plate 2 into the central portion 5A and the peripheral portion 5B.
The cleaning air inflow pipe 6 is installed only in the central portion 5A. Furthermore, the surrounding material support plate 2 of the peripheral portion 5B is
It is formed to have a funnel-like inclination so as to descend toward the central portion 5A.

Because of this structure, the central portion 5
A becomes the upward flow of the circulation flow and the peripheral portion 5B becomes the downward flow of the circulation flow. However, since a strong flow is obtained along the upper surface of the filter material support plate 2 of the peripheral portion 5B, the fibrous material is present in this portion. ▲ Ro ▼
The excess material 5 does not stagnate, and sufficient backwashing can be performed with a circulating flow in only one direction.

[0009]

As described above in detail for the embodiments,
In the present invention, with respect to the circulation flow, as in the prior art, since there are no elements such as a partition plate in the overlayer and a flow direction adjusting plate on the lower surface, which causes an extra resistance, the bubbling energy forms the circulation flow. As a result of forming a strong circulating flow, the fibrous filter material circulates along with this intense circulating flow, but especially in the part of the ascending flow that is bubbling, bubbles are generated. Due to the violent multi-phase flow of the water flow, a strong impact force is received, and ▲ ▼ ▼ ▼ ▼ ▼ ▼ ▼ By repeating the expansion, ideal cleaning is performed. In addition, the filtration tank has a simple structure and can be provided at a low cost, so that it has excellent effects.

[Brief description of drawings]

FIG. 1 is a schematic vertical sectional side view of a first embodiment of the present invention.

[Fig. 2] Similarly, the first tank structure in which the main body of the tank is cylindrical.
Example plan view

[FIG. 3] Similarly, the first one in which the main body of the excess tank is formed into a rectangular tube shape.
Example plan view

FIG. 4 is a schematic vertical sectional side view of a second embodiment of the present invention.

[Fig. 5] Similarly, the second one in which the main body of the tank is also cylindrical.
Example plan view

[FIG. 6] Similarly, the second one in which the main body of the excess tank is formed into a rectangular tube shape.
Example plan view

[Explanation of symbols]

 1 ▲ Filter ▼ Over tank main body 2 ▲ Filter ▼ Over material support plate 3 Partition plate 4 Fiber material ▲ Filter ▼ Over material 5 Partition 6 Cleaning air inflow pipe 7 Cleaning water inflow pipe 8 Treated liquid outflow pipe 9 Overflowed excess liquid Pipe 10 Wash water discharge pipe

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display location B01D 39/04

Claims (2)

[Claims] 1. A filter material, which is a filter material, is provided with a filter liquid overflow pipe, a treatment liquid flow pipe, a cleaning water flow pipe, and a filter material support plate, respectively. In the filtration device in which the filtration material is laminated on the filtration material support plate to form a filtration material layer, the filtration device is mounted on the bottom surface of the filtration material support plate. A filtration device, characterized in that a partition plate that divides into a plurality of compartments is attached, and a cleaning air inflow pipe is arranged in each of the compartments below the filtration material support plate. 2. The filter material according to claim 1, wherein the fibrous filter material is formed into a substantially spherical shape by bundling a large number of cut crimped yarns, bundling at the center thereof. ▼ Excessive equipment.