JPH10113510A - Filter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an apparatus which removes solid components contained in raw water efficiently. SOLUTION: In a cylindrical container having a raw water supply port 2 and a treated water discharge outlet 3, numbers of rigid plates 4 are laminated to form water passage spaces 9 between the plates 4. In the space 9, a large number of projections 8 are formed on the surface of each rigid plate 4 to make each projection interval 8, and each space 9 is formed to be wide on the port 2 side, to be narrowed toward the outlet 3, and to meander.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filter for removing solids contained in tap water, intermediate water, and sewage.

[0002]

2. Description of the Related Art There is known a filter device comprising a large number of hard plates stacked in a cylindrical container having a source water supply port and a treated water discharge port with a water gap therebetween. (Japanese Patent Publication No. 7-61405).

[0003]

Conventionally, this main apparatus has a structure in which a large number of hard plates having a rough surface (a surface roughness of approximately 1 μm to 100 μm is appropriately selected) are laminated, and each hard plate is laminated. A water gap is formed between the plates to remove solids when passing between the hard plates.

[0004] However, the size of the solid content contained in the source water is not constant. Therefore, in order to remove very fine particles (solid content), a hard plate having a very fine surface roughness must be used. Backwashing must be performed, resulting in a problem that the working efficiency is extremely poor, and a problem that it is impossible to remove fine particles if a hard plate having a rough surface is used.

[0005] In addition, when solids adhere between the hard plates due to long-term use and the filtering function is lowered, pressure water is injected from the treated water discharge port to wash out the solids (backwashing). Also in this case, there is a problem that it is difficult to sufficiently wash out the hard plate simply by making the surface of the hard plate rough.

[0006] It is an object of the present invention to provide a filtration device free from such a problem.

[0007]

According to the first aspect of the present invention, a large number of hard plates are laminated in a cylindrical container having a source water supply port and a treated water discharge port. In a filtration device having a water passage interval, a number of projections are provided on the surface of each hard plate to form the water passage interval between the projections, and each water passage interval is wide at the source water supply port side. With gradually narrowing as it reaches the discharge port side, it is characterized in that a meandering water passage interval is formed by the protrusion, by providing such a configuration, when supplying source water to each water passage interval, When the flow on the back side of the protrusion near the source water supply port stagnates, large solids of particles adhere and remain, and fine particles adhere on the place where the flow on the back side of the protrusion distant from the source water supply port stagnates. The solids content can be removed.

According to a second aspect of the present invention, in the first aspect of the present invention, the hard plate is formed into a circular plate, and a porous pipe connected to the treated water discharge port of the container is provided at the center of the hard plate. It is characterized by providing a water pipe consisting of, and supplying the source water from the source water supply port around the hard plate,
By providing such a configuration, it is possible to increase the area occupied by the water flow interval in a portion close to the source water supply port and in which the source water containing a large amount of solids flows.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described with reference to the drawings.

In the drawings, reference numeral 1 denotes a cylindrical container provided with a source water supply port 2 and a treated water discharge port 3, and reference numeral 4 denotes a hard plate made of a glass plate or the like housed in the container 1 stacked.

In the embodiment shown in the drawings, the container 1 is formed in a cylindrical shape having one end closed and an opening 1a at one end, and a source water supply port 2 provided on the outer periphery of the container 1. The treatment water discharge port 3 is provided at the center of an end plate having one end closed, and a porous pipe 5 communicating with the source water supply port 2 is provided at the center of the container 1. 5,
The disk-shaped hard plate 4 having a through hole 4a at the center was fitted in the through hole 4a and housed in the container 1.

Reference numeral 6 denotes a lid for closing the opening 1a of the container 1. The lid 6 is composed of a substrate 6a and a rubber or other elastic body 6b provided inside the substrate 6a. It was fitted so that its end face hit the hard plate 4 housed in the container 1.

The lid 6 is fastened to the container 1 with a plurality of screw rods 7. When the lid 6 is tightened with the screw rod 7, the laminated hard plate 4 is pressed by the elastic body 6b to press the hard plates 4 together. I did it.

The elastic body 6b has an inner end provided with a recess 6c into which one end of the porous pipe 5 is fitted.
When the hard plates 4 are pressed against each other by the tightening, the lid 6 can be moved without being disturbed by the porous pipe 5.

On one side surface of each hard plate 4, a number of projections 8 are provided on the surface of each hard plate 4, and a water passage 9 is formed between the projections 8, and each water passage 9 is provided with a source water supply. At the mouth 2 side, the width gradually becomes narrower toward the treated water discharge port 3 side, and the water passage interval 9
Was formed so as to meander by the projections 8.

In the figure, a large number of protrusions 8 having a height of 20 μ are provided in a ring shape in six steps on the inner side and outer side on one side surface of a hard plate 4 made of heat-resistant disc-shaped glass having a diameter of 10 cm. When the plates 4 were stacked, the water gap 9 was formed between the projections 8.

To explain this further, the annular portion located at the outermost periphery is relatively wide by arranging a large number of projections 8 having an average width of about 4 mm in an annular shape with an interval of an average width of about 6 mm therebetween. An annular portion which forms a water passage space 9 and which is located inside has a projection 8 having an average width of 4 mm and an average width of about 4 mm therebetween.
A large number of holes are arranged at intervals of 1 mm to form a water passage space 9 that is narrower than the annular portion located at the outermost periphery, and the annular portion located further inside has a projection 8 with an average width of about 4 mm Numerous arrangements having an average width of about 3.5 mm are provided to form a narrower water passage space 9, and further, an annular portion located on the inside thereof has a projection 8 having an average width of about 4 mm between them. A large number of protrusions 8 are arranged at intervals of about 3.5 mm, and a plurality of protrusions 8 having an average width of about 3 mm are arranged at intervals of about 2.5 mm between them. Then, a narrower water passage space 9 is formed, and the annular portion located at the innermost periphery is formed by arranging a large number of protrusions 8 having an average width of about 3 mm with an average width of about 1.5 mm between them. The narrowest water passage 9 was formed.

The annularly arranged projections 8 are arranged so as not to overlap with the projections 8 located on the outer periphery thereof.
The water gap 9 formed between the projections 8 was meandered, and a gap 10 of about 2 mm was provided between the annularly arranged projections 8 (in the radial direction).

In this embodiment, after a portion corresponding to the projection on the surface of the hard plate 4 made of glass is masked,
By immersing in an etching solution and performing an etching process, innumerable projections 8 having a height of about 20 μ were formed on one side of the hard plate 4.

Using this filtration apparatus, a solution obtained by dissolving activated carbon powder (including 50 μm to 1 μm particles) in water as a solid was filtered, and the black water became colorless and transparent. This seems to be because very fine activated carbon powder was removed by the present filtration device. The injection speed at this time was 0.2 lh / cm ² .

The hard plate 4 after the filtration was taken out and observed. As a result, the activated carbon particles adhered to a part of the water gap 9 formed between the projections 8 and the back side of each projection 8. It was confirmed that the particles clogged in the water gap 9 formed between the projections 8 and 8 were larger and adhered to the back side of the projections 8 near the outer periphery. It was confirmed that the particles were larger. This is because the larger the particles, the closer to the source water supply port 2 becomes clogged between the water passage intervals 9, and the larger the heavier particles, the faster they accumulate and separate in the portion where the flow behind the projections 8 stagnates. Seem.

In this device, the solid content is accumulated in the water passage interval 9 due to long-term use, and the filtration capacity is reduced. At this time, after the tightening by the screw 7 is released, by injecting the pressurized water from the treated water discharge port 3, it is possible to wash out (backwash) the solids accumulated in the water passage interval 9. 11
Denotes an outlet of the washing water provided in the container 1.

In backwashing, it was also found that the width of the water passage 9 was wider as the water passage 9 was downstream, so that the attached solids could be easily washed away.

The diameter of the hard plate 4 represents the size of the experimental apparatus, and it goes without saying that the diameter can be changed according to the amount of source water to be treated.

In the above-described embodiment, the hard plate 4 is formed in a disk shape, the source water is supplied from the outer periphery thereof, and the treated water is taken out through the porous pipe 5 provided at the center of the hard plate 4. However, this is because, for example, the source water flows from one side of the rectangular hard plate 4 toward the other side, and the water passage intervals formed by the countless projections on the side surface of each hard plate 4 The same filtration can be performed by gradually narrowing the water supply port side gradually toward the treated water discharge port side.

The filtering device is the same as the tap water treatment device shown in FIG. 4 except that the tap water from the river to the landing well A where the solids are precipitated and separated is led to the mixing tank B, If the water after the activated carbon is introduced into the apparatus is guided to the device C by the pump P, the activated carbon can be recovered together with the solid matter, and the activated carbon can be reused.

In the conventional water treatment apparatus, the flocculant was put into the mixing tank B to remove the activated carbon and was removed. Therefore, the activated carbon was solidified with the flocculant and could not be reused. there were.

In the sewage treatment apparatus shown in FIG.
If the clean water after aeration treatment in the aeration tank D is led to the device C,
Very fine solids contained in tap water can be removed. After passing through the device C, the clean water is discharged to a river or the like after necessary treatment.

In the intermediate water treatment apparatus shown in FIG.
If the wastewater is removed by a screen-type waste removal apparatus E to remove the contaminants, and the wastewater is guided to the apparatus C, fine contaminants (solid content) contained therein can be removed. After that, if the waste water is subjected to chlorine disinfection or other treatment in the treatment tank F, it can be used as intermediate water. In FIG. 6, G indicates a storage tank for storing the middle water, and H indicates a clean water tank.

In the above embodiment, the hard plate 4
The projections 8 are provided only on one side and the other side is a flat surface, but it goes without saying that the projections 8 may be provided on both sides.

In the above embodiment, only the width of the water passage space 9 is changed and the height of the projections 8 is kept constant. However, the height of the projections 8 is increased on the water supply port 2 side, that is, on the outer periphery. Outlet 3
If it is set lower on the side, better filtration can be performed.

[0032]

According to the first aspect of the present invention, when the source water is supplied to each of the water passage intervals, a large solid content of particles is formed where the flow behind the protrusion near the source water supply port stagnates. Fine particles adhere to the place where the flow remains behind the protrusions remote from the source water supply port, and the solid content contained in the source water can be removed. Since the interval 9 is wider toward the downstream, it is easy to wash away the attached solids.

According to the invention of claim 2 of the present application, in the invention of claim 1, the area of the water flow interval near the source water supply port and where the source water containing a large amount of solids flows can be made large. As a result, a filter device that is less likely to be clogged can be obtained.

[Brief description of the drawings]

FIG. 1 is a cutaway side view of the apparatus.

FIG. 2 is a sectional view taken along line AA of FIG. 1;

FIG. 3 is a sectional view taken along line BB of FIG. 2;

FIG. 4 is a diagram showing an example of a system to which the present apparatus is applied.

FIG. 5 is a diagram showing another example of a system to which the present apparatus is applied.

FIG. 6 is a diagram showing another example of a system to which the present apparatus is further applied.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Container 2 Source water supply port 3 Treated water discharge port 4 Hard plate 5 Porous pipe 6 Lid 8 Projection 9 Water passage interval

Claims (2)

[Claims] 1. A filter device comprising a plurality of hard plates laminated in a cylindrical container having a source water supply port and a treated water discharge port to form a water passage space therebetween. A large number of projections are provided on the surface of the plate to form the water passage intervals between the projections, and the water passage intervals are gradually widened on the source water supply port side and gradually reduced toward the treated water discharge port side. A filtering device, wherein a meandering water passage interval is formed. 2. The container according to claim 1, wherein said hard plate is formed as a circular plate, and a water pipe formed of a porous pipe connected to a treated water discharge port of the container is inserted into a through hole provided at a center position of said hard plate. 2. The filtering device according to claim 1, wherein a number of hard plates are mounted in a stacked state, and the source water is supplied from around the hard plates.