JPH07124409A - Filter using floating filter medium - Google Patents

Abstract

PURPOSE:To efficiently make the filter layer loose and to wash the-liquid- collecting nozzles of the filter by laterally placing a cylindrical filtration tank and providing the tank with a pit at its bottom and also an agitating wheel-vane on its sidewall. CONSTITUTION:The cylindrical filtration tank 1 packed with the granular floating filter medium 2 is placed so that the central axis of the tank 1 is horizontal, i.e. laterally. The filtration tank 1 is provided with the liquid collecting nozzles 3 in the inner surface of its top, the pit 4 for supplying the original liquid at its bottom and the agitating wheel-vane 5 on the inside of its sidewall. At the time of generating clogging in the filter layer after a filtering operation, the rotary wheel-vane 5 is rotated to generate a swirling stream along the circumference of the filtration tank 1 and the swirling stream impinges on the filter layer to make it loose and to remove the clogging. At the same time, the liquid- collecting nozzles 3 above the filter layer are impacted and washed with the swirling filter medium 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a filtering device using a floating filter material such as granular expanded polystyrene.

[0002]

2. Description of the Related Art Conventionally, a filtering device using a particulate floating filter medium has been known. Japanese Examined Patent Publication No. 2-22682 is one such example, in which a cylindrical tank is provided vertically, a floating filter material is filled inside, and a collecting nozzle is provided on the inner surface of the top of the tank and a stock solution is provided at the bottom of the tank. Is equipped with a feed hole and a stirring impeller for filter media.

[0003]

However, in the case where the cylindrical tank as described above is provided vertically and the stirring blade is provided at the bottom, when the filter medium is clogged, the stirring medium is rotated even if the stirring blade is rotated. Flows only along the inner surface of the cylinder of the tank and is not easily loosened. Especially, the filter material in the upper part of the tank is hard to flow, and therefore the liquid collecting nozzle cannot be sufficiently washed.

[0004]

The present invention is capable of solving the above-mentioned conventional problems, and the gist of the present invention is to provide a cylindrical tank having a rectangular longitudinal section with its central axis. Is installed horizontally, the tank is filled with granular floating filter material, a collecting nozzle is provided on the inner surface of the top of the tank, and a supply port for the undiluted solution is provided at the bottom of the tank. Is provided. In the case of a long tank, a plurality of the liquid collection nozzles and the stock solution supply port are provided depending on the length.

[0005]

The apparatus according to the present invention is configured as described above, and the floating filter medium filled in the tank floats above the inside of the tank whose cross section is formed in an arc shape, and the liquid collecting nozzle section is the most An ideal consolidated filtration layer can be formed. Then, when the filtration layer is clogged during the filtration operation, by rotating the rotary impeller, in the tank,
A swirling flow can be generated along the inner peripheral surface, and the floating filter medium is stirred along with this swirling flow. In other words, the swirl flow generated by the rotor impinges on the lower surface of the filter layer and acts to scoop it to unravel it, while the swirl flow of the conventional device unravels from the lower surface of the filter layer and efficiently unravels the filter layer. Is something that can be done. And
In the upper layer of the filtration layer, that is, in the liquid collecting nozzle portion, the swirling filter medium comes into contact with the liquid collecting nozzle surface, and clogging can be eliminated. Hereinafter, the present invention will be specifically described with reference to the drawings.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the drawings, reference numeral 1 is a filtration tank filled with a granular floating filter material 2, which is constructed in a cylindrical shape and has its central axis horizontal, that is, installed horizontally. Three
Is a liquid collecting nozzle provided on the inner surface of the top of the filtration tank 1, and 4 is a pit for supplying a stock solution provided at the bottom of the filtration tank 1. The pit 4 also serves as a drain pit for cleaning liquid drainage and the like. Further, the number of the liquid collecting nozzles 3 and the pits 4 may be increased according to the length of the tank 1. Next, reference numeral 5
Is a stirring impeller provided inside the side wall of the filtration tank 1,
Although it is provided in the center axis of the filtration tank 1 in FIG. 1, it may be provided toward the filter medium layer as shown in FIG. 2 if necessary. In the case of a long filtration tank 1, it may be provided on both left and right sides as shown in FIG. Reference numeral 6 is a drive motor for the stirring impeller.

The apparatus according to the present invention is configured as described above, and when the stock solution supplied from the pit 4 to the filtration tank 1 passes through the two layers of the floating filter material, its impurities are captured, The filtrate can be taken out of the machine via the collecting nozzle 3.

When the filter layer is clogged in such a filtration operation, the rotary impeller 5 is rotated to cause the filtration tank 1 to rotate in the filtration tank 1 as shown by arrows in FIGS. 1 and 3. A swirl flow can be generated along the circumference of 1, and this swirl flow can hit the filter medium layer and loosen it.

That is, in the conventional vertical type filtration tank 1 as shown in FIG. 6, the swirling flow b due to the rotary impeller 5 is
The lower surface of the filter medium layer swirls along the lower surface to gradually loosen the upper layer, and the uppermost layer portion could not be charged and decomposed.However, in the device according to the present invention, the swirling flow is directed to the lower surface of the filter medium layer. On the other hand, it works by hitting it from the front and scooping it out, so that it can be loosened. And the loosened filter medium 2 is
The whole amount is swirled along the inner surface of the filtration tank 1 to be unraveled and impurities are separated, and the floating filter material 2 hits the liquid collecting nozzle 3 to completely wash the liquid collecting nozzle 3 as well. Is something that can be done.

After washing the floating filter medium 2 and the liquid collecting nozzle 3 as described above, the polluted water is drained from the pit 4 so that only heavy contaminants can be separated and discharged. It is possible to start the filtration operation again by supplying. FIG. 4 schematically shows the above-mentioned filtration cycle, and FIG. 5 schematically shows a case where the filtration operation is performed only by stirring and washing without draining, and the filtration operation cycle is dependent on its purpose. In some cases, a general filtration operation as shown in FIG. 4 may be performed, in other cases as shown in FIG. 5 only the clogging may be separated, and when a filtration operation is performed in a process combining these cycles. There is also something.

[0011]

As described above, in the apparatus according to the present invention, a cylindrical filtration tank is installed sideways in a filtration apparatus using a floating filter medium, a liquid collecting nozzle is provided at the top and a stock solution supply pit is provided at the bottom. By providing a stirring impeller on the side wall along with the above, it is possible to automatically form an ideal consolidating filtration layer in the liquid collecting section. When this filtration layer is clogged and regenerated, In addition to being able to efficiently stir the entire filtration layer, it is possible to completely clean and regenerate the liquid collection nozzle that was difficult to clean in the past. Was solved.

[Brief description of drawings]

FIG. 1 is a schematic vertical sectional side view of a filtration device according to the present invention.

FIG. 2 is also a vertical side view of a part of another embodiment.

FIG. 3 is likewise a schematic vertical sectional side view of another embodiment.

FIG. 4 is a schematic view of a filtration cycle using the device according to the present invention.

FIG. 5 is a schematic view of another example of a filtration cycle using the device according to the present invention.

FIG. 6 is a schematic vertical sectional side view of a conventional filtering device of this type.

[Explanation of symbols]

 1 Filtration tank 2 Floating filter medium 3 Liquid collecting nozzle 4 Pit 5 Rotor wheel

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display location 8925-4D B01D 29/08 540 A 7112-4D 29/38 580 F

Claims (2)

[Claims] 1. A cylindrical tank 1 having a rectangular vertical section is installed with its central axis being horizontal, and the tank 1 is filled with a granular floating filter material 2 and is collected on the inner surface of the top of the tank 1. The liquid nozzle 3 is provided with the undiluted liquid supply port 4 at the bottom,
Furthermore, a filtration device using a floating filter medium in which a rotary impeller 5 is provided on the side wall of the tank 1. 2. The liquid collection nozzle 3 and the stock solution supply port 4
A filtration device using the floating filter medium according to claim 1, wherein a plurality of filters are provided respectively.