JPH0833803A - Filter using elastic filter medium - Google Patents

Abstract

PURPOSE:To provide a filter in which a consolidated cane filter bed is formed by an elastic filter medium when water is passed to be filtered and the consolidated cone filter bed is expanded when it is washed and easily cleaned. CONSTITUTION:An elastic filament such as a synthetic-resin filament is formed into mat, the filament is cut to a square to form a filter medium piece, and the piece is charged into a filtration tank 2. The bed 3 is expanded when the supply of raw water is stopped due to clogging, etc., the void in the bed 3 is increased, hence the cake, etc., in the bed 3 are easily washed off, and the filter medium is regenerated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filter for sewage and the like, and more particularly, the present invention relates to an improvement of the filter medium.

[0002]

2. Description of the Related Art In the conventional filtration apparatus of this type, the gap between the filtration layers is constant or slightly compressed during the sewage flow treatment. Tokkyo 2-22
No. 682 uses a styrofoam floating filter material as the filter material, and the degree of compaction of the filter layer during the filtering operation is almost the same as when the operation is stopped.

[0003]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
It is desirable that the filter layer is densely formed at the beginning of the initial filtration, and that when the clogged filter medium is regenerated, the filter layer becomes sparse to facilitate cleaning and regeneration.

[0004]

SUMMARY OF THE INVENTION The present invention facilitates cleaning and regeneration by forming a consolidation filter layer during the above-described filtration operation and forming a sparse filter layer during cleaning and regeneration of the filter medium. Then, the gist of the point is that the unit piece is made of a fibrous material, has a square shape and has water permeability and elasticity, and is charged into a filtration tank to form a filtration layer,
By supplying sewage to the filtration tank, the filtration layer is consolidated, and by stopping the supply of sewage, the filtration layer is released from consolidation.

The filter medium to be loaded in the filtration tank is formed by laying down fluff-like elastic fibers into a mat having a thickness of 3 to 5 mm, and the mat-shaped filter medium having a side of 10 to 50 mm. It is cut into a shape, and is composed of fibers having a specific gravity of less than 1.

[0006]

Since the filter medium according to the present invention is formed into a small piece having a side of 10 to 50 mm which has water permeability and elasticity as described above, when it is loaded into the filtration tank, the filter layer is formed by this small piece. Can be formed.

Since this filter layer is formed of a small piece of elastic filter medium, by supplying sewage, the supply pressure of the wastewater causes the pores of each filter medium and the spaces between each filter medium to be filtered. Layers can be formed.
Therefore, even fine SS (fine suspended particles) in the wastewater can be captured and filtered efficiently.

Next, when the filter layer is clogged, the supply of dirty water is stopped, that is, the operation is stopped, so that the filter layer becomes sparse due to the elasticity of the unit piece of each filter medium. Therefore, stirring for peeling off the clogging material becomes easy, and the clogging material on the outer periphery and inside of each filter medium piece can be easily washed and regenerated.

Further, when fluff-like fibers having elasticity are stacked as a filter medium and formed into a mat-like shape and cut and formed, as compared with the conventional sand or granular Styrofoam, etc.,
When the filtration layer is configured, it has a wide porosity and can capture even fine SS, which is ideal as a filter medium.

Further, if the filter medium has a specific gravity of about 0.9, it is lighter in weight and easier to handle than sand and the like.
Either an upflow type filtration device or a downflow type filtration device is suitable because it is easy to stir and wash. Hereinafter, the present invention will be specifically described with reference to the drawings.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a unit piece of a filter medium forming a filter layer in an apparatus according to the present invention, the structure of which is such that a synthetic resin material is piled up with elastic fluffy filaments to obtain a thickness. A 3 to 5 mm mat-shaped filter medium is formed, and the entangled filaments are heated and welded, and one side is 1
It is cut into small rectangular unit pieces 1 of 0 to 50 mm.

FIG. 2 is a block diagram of the manufacturing process of the unit piece 1 of the above filter medium, and FIG. 3 is an enlarged view of a part thereof for explaining the internal structure of this filter medium. The fiber diameter of the synthetic resin filament 1a constituting this filter medium is 30 to 200.
It has a thickness of μm and its specific gravity is about 0.9. Further, in order to bond and fix the synthetic resin filament 1a of the unit piece 1 shaped into a mat, the filament 1c coated with the synthetic resin material 1b having a melting point lower than that of the synthetic resin filament 1a is mixed. , Heating and welding. See FIG.

Next, FIGS. 4 to 6 show the operation of the apparatus when the present invention is applied to a closed type upflow filtration apparatus in the order of steps. In the drawings, reference numeral 2 is a filtration tank, and 3 is a filtration tank. The filtration layer formed in the filtration tank 2, 4 is a stirring blade, 5 is a waste water supply passage, and 6 is a filtrate take-out passage.

The filtering device constructed as described above operates as follows. That is, the filter medium charged in the filtration tank 2 floats in the filtration tank 2 by injecting raw water to form the filtration layer 3. At this time, the filter medium merely floats, and the thickness of the filtration layer 3 is L1. See FIG.

In the filtration tank 2 supplied with raw water as described above,
When the raw water is press-fitted from the supply path 5 to be filtered, the filter material forming the filtration layer 3 has elasticity, so that the raw water is pushed up in a consolidated form by the supply pressure of the raw water to form a fine filtration layer. At this time, since the filter medium according to the present invention is made of a fibrous material and has a high porosity, it is pushed up finely (thickness L2) and has a higher filtration capacity than the conventional device (using a granular floating filter medium or the like). Have. (See Figure 5).

When such filtration operation is continued and the filter medium is clogged, the supply of raw water is stopped to expand the pressure-consolidated filtration layer 3 due to its elasticity (thickness L3).
Then, by rotating the stirring blade 4, it is sufficiently stirred,
It is possible to remove even the clogging between the filter pieces and the clogging within the filter pieces. See FIG.

In this way, the sewage from which the clogging material has been separated from the filter medium is discharged from the bottom of the filter medium tank 1 to the outside of the tank, and raw water is supplied instead of this, so that the filtration operation can be resumed. . Since the filter medium pieces are larger than the conventional granular filter medium at the time of discharging the waste water, there is no risk of spillage. As shown in the figure, in the case of an upflow type filtration device using a filter medium having a specific gravity of 1 or less, the water level can be lowered during stirring, and stirring and washing can be facilitated. At this time, the washing water can be introduced from outside the system. Further, in the device according to the present invention, the porosity between the filter media is 85 to 85.
90% and 30% of other granular filter media (sand and Styrofoam)
Since it is higher than about 40%, it can be used as a biological treatment apparatus not only by filtration operation but also by aerating the inside of the filter medium.

[0018]

As is apparent from the above description, since the filter device according to the present invention uses the fibrous and elastic filter medium as the filter medium, it is possible to form a compacted filter layer at the time of filtration. Since the filtration layer becomes rough and facilitates the separation and separation of the clogging during the backwash regeneration of the filter medium, since the filter medium in the present invention uses the fibrous filter medium as the base, It has a much higher porosity than the conventional filter media such as sand and Styrofoam, and has a high-performance filtration capacity.

[Brief description of drawings]

FIG. 1 is a perspective view of a unit piece of a filter medium according to the present invention.

FIG. 2 is a block diagram of a manufacturing process of a filter medium according to the present invention.

FIG. 3 is an enlarged view of a part of the filter medium for explaining the structure of the filter medium according to the present invention.

FIG. 4 is a schematic diagram for explaining an operating state of the filtration device according to the present invention, showing a state in which dirty water is filled.

FIG. 5 is likewise a filtration operation state.

FIG. 6 also shows a stirring and washing state of the filter medium.

[Explanation of symbols]

 1 unit piece 2 filtration tank 3 filtration layer

Claims (3)

[Claims] 1. A unit piece 1 of a filter medium is made of a fibrous material, has a square shape and has water permeability and elasticity, and is charged into a filtration tank 2 to form a filtration layer 3, By supplying sewage to 2, the filtration layer 3 is consolidated, and by stopping the supply of sewage, the filtration layer 3 is released from the consolidation. The filtration device used. 2. The filter medium is formed by stacking fluff-like elastic fibers to form a mat having a thickness of 3 to 5 mm, and cutting the mat-shaped filter medium into a square shape having one side of 10 to 50 mm. The filtration device using the filter medium having elasticity according to claim 1. 3. The filtration device using a filter medium having elasticity according to claim 1, wherein the filter medium is composed of fibers having a specific gravity of less than 1.