JPS6291218A - Filter medium - Google Patents

Abstract

PURPOSE:To offer a filtration consistently lasting for a long period of time, free from the decrease of void volume caused by the adhesion of organic substance, and of larger filter area by providing regular up and down sink-float on the sheet-type substance having constant, meshy spaces. CONSTITUTION:A sheet having square and round meshes is formed, on which the convex 2 and the concave 3 are provided in an order of regular up and down sink-float. The sheet can be made of synthetic resin or of metal wire covered with synthetic resin or rubber. The mesh can be of square-type, side dimension of 0.5-2cm. The sink-float can be of corrugated sheet-shape. The filter mediums are accumulated and stored in the filter and when the raw water containing organic substance is supplied from the side direction A, the organic substance absorbs to the mesh of filter medium 1 to clog the mesh, keeping the filter area from decreasing as the raw water partly flows flexing at the concave 3.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is a filter medium for use in clarifying 1M dilute suspensions, water, etc.

[Prior art]

Generally, the filtration methods used in clarifying filtration include gravity filtration, batch vacuum filtration, continuous vacuum filtration, batch pressure filtration, and continuous pressure filtration, and there are many types of filter media used for these.

Among these, when filtering a large amount of water, such as circulating filtration of river or pond water, gravity filtration is generally used due to equipment limitations, and it is common to use a granular layer such as sand as the filter medium. It is. However, in a filtration device that uses a granular layer as a filter medium, the size of the device cannot be avoided in order to secure a water head above the footfall.
Furthermore, since the filtration area is not large, the adhesion of a small amount of organic matter reduces the porosity and increases the filtration resistance exponentially, so the continuous filtration time and throughput are small.

Further, although there is a felt-like sheet or the like outside the granular layer as a filter medium, the filter surface is clogged with organic matter and the filtration resistance increases rapidly, making continuous filtration impossible for a long period of time.

[Problem that the invention seeks to solve]

Conventional filter media for clarifying and filtering water or dilute solutions containing organic substances have a problem in that the porosity and filtration area are small, making it impossible to continuously filter a large amount.

[Means for solving problems]

The filter medium according to the present invention is a sheet-like filter medium in which mesh-like voids are continuously formed, and the filter medium regularly floats up and down, or a mesh sheet has a sheet that regularly floats and sinks. It is joined together.

[For production]

In the filter medium according to the present invention, the filtration area becomes large due to floating and sinking, and the porosity becomes significantly large due to the large voids.

〔Example〕

FIG. 1 is a perspective view of an embodiment of the present invention.

In the figure, (1) is the filter material, which is formed into a square, round, mesh-like sheet, and has convex portions (
2) and a recess (3). The sheet itself is made of synthetic resin because it is necessary to maintain a certain regularity, but it may also be a metal wire or strip coated with synthetic resin, synthetic rubber, or the like. The mesh size is 0.5 to 2, preferably 0.
Any shape such as an angular shape with 7 to 1.5 side sides may be used.

FIG. 2 shows another embodiment of the present invention, in which a corrugated mesh sheet in which ridges appear regularly and continuously on a square mesh sheet (5) is joined. The shape is the first
Although it is diamond-shaped unlike the filter medium (1) in the figure, the size of the corners is similar to that of a diamond. Moreover, the material is also the same as that of the filter medium (1).

The filter medium of the present invention is constructed as described above, and includes a filter medium (1),
(4) are stacked on top of each other and stored in the filtration device, horizontally (
When raw water containing organic matter is supplied from A), the organic matter adheres to the meshes of the filter media (1) and (4), and the meshes in those areas are blocked, but the convex portions of the filter media (1) and (4) ( 2).

There are regular recesses (3
), (6), so the raw water is in the depressions (3), (6)
Since the flow is partially bent, the filtration area does not decrease.

Also, although the mesh itself is large, the convex parts (2) and (5) and the concave parts (
3) and (6) are formed, organic matter in the raw water easily adheres to the filter media (1) and (4). Furthermore, the convex part (2
).

(5) and the recesses (3) and (6) greatly increase the filtration area, allowing continuous filtration, and the bacteria that adhere to the filter medium along with the organic matter can easily biologically decompose the organic matter. Note that the filter media (1) and (4) can easily be elastically deformed under the load of a constant force due to both their shape and material, so that they can be accommodated in any type of filtration device.

Furthermore, the same effect can be obtained by stacking the filter media (1) and (4) respectively and supplying raw water from the top to the bottom for filtration, if necessary.

〔Effect of the invention〕

As explained above, the filter medium according to the present invention does not reduce the porosity even when organic matter from raw water adheres to it, has a large filtration area, and because of its morphological characteristics, can easily capture organic matter and last for a long time. It has various practical effects such as being able to perform continuous filtration, being inexpensive to manufacture, and being able to be accommodated in any kind of filtration device.

[Brief explanation of drawings]

FIG. 1 is a perspective view of one embodiment of the invention, and FIG. 2 is a perspective view of another embodiment of the invention. In the figure, (IL f41 is a filter medium, (2) is a convex part, (
5) is a ridge portion, and (31, (6) are recessed portions).

Claims (1)

[Claims] 1. A sheet-like filter medium in which mesh-like voids are continuously formed, and the mesh-like voids are formed on at least one surface so as to rise and fall regularly.