JPH0560505U - Filtration device - Google Patents

Abstract

(57) [Abstract] [Purpose] The present invention aims to reduce the filtration cost by significantly reducing the amount of backwash water used, and to control the filtration accuracy freely without replacing the filter medium. An object of the present invention is to provide a filter device having the above-mentioned structure. [Structure] In this invention, a cotton-like filter material is filled in a bag having a large number of openings, and the bag is inserted between upper and lower porous partition plates in a filter to form the upper or lower porous partition. It is characterized in that the plate can be moved up and down.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a filter device used for primary filtration of highly polluted river water, purification of industrial wastewater and purification of various industrial wastewater, for example, recovery of white water in the paper manufacturing industry. The present invention relates to a filtration device which can regenerate a clogged filter medium with an extremely small amount of water for backwashing, thereby significantly reducing the filtration cost.

[0002]

[Prior Art]

 For primary filtration of river water for water use, a filter commonly referred to as a sand filter using sand, anthracite, etc., has been used. In recent years, instead of sand and anthracite, spherical filter media made of "marimo" fiber yarns and "mop" fiber filter media have been widely used.

The sand filter described above has a simpler shape of sand as a filter medium than a fiber filter medium, and it is difficult to form a three-dimensional structure effective for filtration. In order to obtain over-precision, it is necessary to increase the diameter of the filter to make the flow rate extremely slow, or to thicken the filter sand layer. However, increasing the size of the filter is problematic from the standpoint of installation location and cost, and when the sand filter layer is thick, the filtration resistance increases, which increases the frequency of backwashing and increases the backwashing frequency. It is extremely disadvantageous in terms of cost due to heavy use of washing water. This is because the amount of backwash water used has a great impact on the filtration cost. On the other hand, a filter that uses "Marimo" or "mop" shaped filter media, which has been widely used in recent years, is more compact than a sand filter and has a significant advantage in terms of filtration accuracy. I have sex. However, in the case of filters that use "Marimo" or "mop" filter media, if clogging occurs, the filter media is regenerated by flushing backwash water while injecting explosive air. However, in addition to the problem of using a large amount of backwash water, it also takes a long time to stabilize the filtration accuracy because it uses a method of compressing the filter medium only by liquid pressure. . In addition, controlling the filtration accuracy can only be done by changing the amount and type of filter material, which is inconvenient.

[0004]

[Problems to be solved by the device]

 The present invention was made with this point in mind, significantly reducing the amount of backwash water used to reduce filtration costs, and freely controlling filtration accuracy without replacing the filter media. It is an object of the present invention to provide a filtration device that can be used.

[0005]

[Means for Solving the Problems]

 According to the configuration of the present invention in line with the above object, a cotton-like filter material is filled in a bag having a large number of openings, and the bag is inserted between the upper and lower porous partition plates in the filter to obtain the upper or lower porous partition plate. It is characterized in that the cut plate is configured to be movable up and down. In short, the present invention reduces the amount of backwash water used by moving the porous partition plate up and down so that the clogged filter medium can be fir-washed, and at the same time, the porous partition plate filters The gist is that the desired filtration accuracy can be obtained by changing the pressing degree of the material.

[0006]

【Example】

 Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 2 shows an embodiment of the present invention, in which a lower porous partition plate 8 is fixed in a filter 7 having a raw water inflow nozzle 10 in an upper part and a filtrate discharge nozzle 11 in a lower part, An upper porous partition plate 9 is mounted above the lower porous partition plate 8 so as to be vertically movable by the cylinder 1, and a predetermined amount of a spherical filter material 12 is installed between the upper and lower porous partition plates 8 and 9. An example is shown below. As shown in FIG. 3, the spherical filter medium 12 is configured by incorporating a cotton-like filter medium 15 into a net-shaped bag 14. As the cotton-like filter material 15, it is preferable to use a filter material having a low water absorption rate and little settling, in other words, a filter material having a strong restoring force. Examples of such materials include polypropylene, acrylic, polyester and nylon. A cotton-like filter material made of a synthetic resin such as the above is preferably used. In the present invention, the cotton-like filter material 15 is provided in the net-like bag 14. However, even if the cotton-like filter material 15 is repeatedly subjected to fir-washing, the filter material 15 can be obtained by doing so. Can be prevented from falling apart. The bag 14 containing the filtering material 15 is preferably a net-like bag, but the bag 14 having a large number of openings is not limited to the net-like bag as long as it can withstand fir washing. As the cylinder 1 connected to the upper porous partition plate 9, a pneumatic, hydraulic or electric cylinder is used.

[0007]

[Action]

 Next, the operation of the present invention constructed as above will be described. FIG. 2 shows a state in which filtration is performed using the filtration device of the present invention. A predetermined amount of spherical filtration material 12 is filled between the upper and lower porous partition plates 8 and 9 and The upper porous partition plate 9 is moved downward, and the spherical filter medium 12 is pressed to a predetermined density so that a predetermined filtration accuracy can be obtained. By selecting this pressing degree, desired filtration accuracy can be obtained. As the spherical filtering material 12, a spherical filtering material having a diameter of about 8 cm obtained by packing 0.5 denier polypropylene cotton in a polypropylene mesh bag 15 was used. Raw water entered from the nozzle 10 passes through a filter layer (filter material) 12, is filtered, and is discharged from the nozzle 11 as filtered water. While the filtration is continued, the filter material 12 is clogged. The occurrence of clogging can be detected by an increase in pressure, a decrease in the amount of drainage of drainage, or contamination of the drainage. When clogging is detected, the solenoid valve 2 in FIG. 1 is closed, the solenoid valve 3 is opened, the solenoid valve 4 is closed, the solenoid valve 6 is opened, and air is sent from the compressor into the filter. At the same time, the cylinder 1 moves up and down for 5 minutes at a cycle of 5 times / minute. By the vertical movement of the cylinder 1, the clogging substance in the cotton of the filter medium is discharged.

Next, the electromagnetic valve 6 is closed and the electromagnetic valve 5 is opened, and as shown in FIG. 4, backwash water is passed through the filter 7 for about 6 minutes. In this way, about 90% of the dirt on the filter medium was removed. This was determined by measuring the initial weight of the filter medium, the dry weight of the filter medium when clogging occurred, and the dry weight after washing. Next, the solenoid valves 5 and 3 are closed, the solenoid valves 2 and 4 are opened, and raw water is fed from the nozzle 10 of FIG. In the above embodiment, the upper porous partition plate 9 is moved up and down, but this need not necessarily be the case, and the lower porous partition plate 8 may be moved up and down. According to the above experiment, the filter medium 12 filled in the net-shaped bag can endure the permanent test by the piston moving up and down 20,000 times, and in the regeneration test, it can be repeatedly backwashed 800 times. It was confirmed to be possible. Further, according to the above experiment, the filtration device of the present invention requires only about 60% of the amount of backwash water required for backwashing, as compared with the filter using the marimo and mop filter media. It showed a great effect.

[0009]

【effect】

 As described above, according to the present invention, since the filter material can be washed with fir by vertically moving the porous partition plate sandwiching the filter material, the amount of water used for cleaning can be significantly reduced. In addition, the clogging filter material can be regenerated in a short time, so the time when the filtration device is stopped can be shortened, and as a result, the pit for storing raw water and backwash water can be made smaller. Therefore, it is possible to significantly reduce the filtration cost together with the decrease in the amount of water used, and it is possible to obtain a predetermined filtration accuracy simply by changing the pressing force of the filter medium without replacing the filter medium. It has a remarkable effect not seen in the conventional filtration device of this kind.

[0010]

[Brief description of drawings]

FIG. 1 is an overall view showing an embodiment of the present invention.

FIG. 2 is a partially cutaway view showing a state of filtering using the filtering device of the present invention.

FIG. 3 is a perspective view showing a spherical filter material used in the present invention.

FIG. 4 is a partially cutaway view showing a state where backwashing is performed using the filtering device of the present invention.

[Explanation of symbols]

 1 Cylinder 7 Filter 8 Lower Perforated Partition Plate 9 Upper Perforated Partition Plate 12 Spherical Filter Material

Claims (4)

[Scope of utility model registration request] 1. A cotton-like filter material is filled in a bag having a large number of openings, which is placed between upper and lower porous partition plates in a filter,
A filtration device, wherein the upper or lower porous partition plate is configured to be movable up and down. 2. A cylinder is connected to the porous partition plate,
The filtration device according to claim 1, wherein the porous partition plate can be moved up and down by moving the cylinder up and down. 3. The multi-layer filtration cylinder according to claim 1, wherein the bag having the plurality of openings is formed in a net shape. 4. The filtration device according to claim 1, wherein the filtration efficiency is adjusted by freely adjusting the interval between the upper and lower porous partition plates.