JP2672780B2 - 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 filter medium used for treating water, waste water and other liquids.

[0002]

2. Description of the Related Art Sand filtration is generally used for treating water.

[0003]

Sand is generally used as a filter medium for filtering water and the like. In recent years, however, due to deterioration of the water environment, filtration of raw water in water treatment, filtration after coagulation and sedimentation, or sewage wastewater treatment. In the filtration of secondary treated water, sand filtration often causes a large load of suspended solids or suspended solids, resulting in shortened filtration duration, incomplete backwashing, blockage of the filter bed, and other deterioration of the filtration function. ing. In addition, there is a demand for new filter media that cannot withstand the demand due to the exhaustion of resources.

[0004]

[Means for Solving the Problems] Innumerable shape-retaining wire rods are circumferentially arranged to form a spherical fiber bundle, and the shape-retaining fibers include polyester, polypropylene, and polyvinylidene chloride. Resin fibers such as acrylic resin are preferable.

[0005]

When the layers are put into the filter to form a filter layer, the filter medium itself has a three-dimensional structure, so that the flow velocity of water and the upper filter medium consolidate in the lower part of the filter layer, but in the middle part of the filter layer. The density of the filter medium becomes slightly rough, and the density of the filter medium in the upper part of the filter layer becomes coarser than that in the middle part of the filter layer. That is, during filtration,
The large-sized suspended particles to be captured are in the upper part, the medium-sized suspended particles are in the middle part, and the fine-sized suspended particles are in the lower part,
Further, during the backwashing, the backwashing water vigorously passes between the fibers, so that the backwashing is smoothly performed.

[0006]

1 is a front view, FIG. 2 is a sectional view, FIG. 3 is a front view of a fiber bundle, and FIG. 4 is a sectional view of a second embodiment. .

In the figure, A is a filter medium according to the present invention.
Is a fiber bundle in which 8000 polyester fibers having a length of 100 mm (diameter 40 μmφ, specific gravity 1.38) 1, 1, 1, ... Are bundled at both ends and the aluminum wire 2 is bundled at both ends. 3, the both ends of the fiber bundle 3 are bonded with an adhesive 4, and the polyester fibers 1, 1, 1, ...
The wire rods for capturing 5, 5, 5, ... Consisting of ... Are arranged in an arc shape to form a spherical fiber bundle, and the both ends adhered to the inside of the spherical fiber bundle by the adhesive 4 are arranged inside. It is arranged.

In order to obtain the filter medium A of the embodiment, polyester fibers 1, 1, 1, ... Are integrally formed by a binding means to form a fiber bundle 3, and both ends of the fiber bundle 3 are bonded with an adhesive 4. By (welding or bundling), and arranging the capturing wire rods 5 made of fibers by inverting the appropriate fiber portions in the middle portion of the fiber bundle 3 between the ends, so to speak. A slightly spherical product is obtained.

Then, a large number of filter materials A, A ... Are charged into the filter to form a filter layer, and in the filter layer, that is, the capturing wire 5,
The filtration operation is carried out by passing the water to be treated between them, and the backwashing operation is carried out, and the floating substances or suspended substances captured by the capturing wire rods 5, 5, 5 ... Is used so as to be separated from the capturing wire rod 5.

The capturing wire may be made of resin fiber such as polypropylene, polyvinylidene chloride, acrylic, etc., instead of polyester fiber, as long as it has corrosion resistance and shape retention. In the case of resin fiber, there is also a means for holding the bundled state by fusing each other instead of bundling.

Corrosion-resistant metal wire rods such as stainless wire rods may be used as the means for binding the fibers, or the fibers may be used to form the fiber bundle.

The above numerical values relating to the polyester fiber 1 used in the examples do not have to be limited to the practice of the present invention.

In order to obtain the product of the present invention, a pair of ring-shaped bundles are obtained by, for example, releasably winding a polyester fiber or the like constituting the capturing wire material around the winding body a required number of times to obtain the pair of ring-shaped bundles. There is also a method of welding, adhering or binding the two together. FIG. 4 shows that by this method, a pair of ring-shaped bundles 6 and 6 are partially bundled with the aluminum wire rod 2 (polyester fibers between the aluminum wire rods 2 and 2 are bonded to each other with an adhesive) for capturing. A second embodiment in which the wire rods 5, 5, 5, ... Are arranged circumferentially will be shown.

In the case of the second embodiment, a pair of ring-shaped bundles may be bound by a single aluminum wire.

[0015]

The present invention has the configuration described above,
A product suitable as a filter medium for multilayer filtration can be provided.

[Brief description of the drawings]

FIG. 1 is a front view.

FIG. 2 is a sectional view.

FIG. 3 is a front view of a fiber bundle.

FIG. 4 is a sectional view of a second embodiment.

[Explanation of symbols]

 A Filter material 5 Wire material for capturing

Claims (2)

(57) [Claims] 1. A filter medium comprising a number of shape-retaining capturing wire rods arranged circumferentially to form a spherical fiber bundle. 2. The filter medium according to claim 1, wherein the capturing wire is composed of resin fibers such as polyester, polypropylene, polyvinylidene chloride, and acrylic.