KR100458563B1 - Spherical Filter For Water Treatment Device - Google Patents

Abstract

The present invention is composed of a core having a diameter of 3 to 7mm and the outer shell surrounding the core, the core is denser than the outer shell, the total diameter is 10 to 20mm, the density is 55 to 75g / l, the material is a spherical filter for spherical fiber yarn It's about media. The media of the present invention provide excellent processing efficiency.

Description

Spherical Filter for Filter Device {Spherical Filter For Water Treatment Device}

The present invention relates to a filter media. More specifically, the present invention relates to a spherical filter medium having a central density greater than that of an outer circumference part, which is used in a depth compression device of a media compression method.

Surface filtration is widely known as a filtration device for advanced treatment of sewage, sewage and wastewater, reuse of heavy water facilities, drinking water, industrial water, river water, swimming pools, fish farm water purification, cooling water reuse, and pretreatment of ultrapure water production. This surface filtration is typically a design criterion and media of filter line speeds of 7 to 15 m ³ / m ² / HR and back-line speeds of 30 to 50 m ³ / m ² / HR as sand, anthracite and micro cartridges. cartridge). However, such a media is generally not reused, a large amount of waste is generated, and the media exchange method is inconvenient.

As an alternative to surface filtration, compressed filter depth filtration has been developed. For example, Japanese Utility Model Publication No. 63-28102 (published: February 24, 1988) discloses the use of a sponge as a compression medium. In addition, Japanese Utility Model Publication No. Hei 5-60505 (published: August 10, 1993) includes 0.5 denier polypropylene, acrylic, polyester, nylon, etc. It puts out and uses what formed the spherical shape of about 8cm in diameter and discloses. In addition, the Republic of Korea Patent Publication 1020010044185 (published: June 5, 2001) as a compression medium made of synthetic fibers, such as nylon, polyester, polypropylene, polyethylene, PVC, PVDC, the thickness of a fiber 200 denier It has been described that a fiber bundle is looped around a rope yarn made by braiding short fibers, which is preferably 20 to 50 mm in diameter, and that a Y-shaped cross-section is preferable.

Applicant of the present invention is also a filter device using a heat-sealing synthetic resin fiber yarn as a compression medium and molded in a similar form to tobacco filter (Korean Utility Model Publication No. 2019980059171, 2019980059172 and 2019980059173 published October 26, 1998) or synthetic resin fibers Filtration device (Korea Utility Model Publication No. 2019990033489 published on August 5, 1999) using a spherical shape of heat-sealed yarn was applied and developed.

However, the effects of the physical properties of the media on the water treatment efficiency, filtration rate, median life, backwash time, backwash amount, etc. have not been studied and reported in detail.

The inventors have studied the correlation between the material treatment, filtration rate, filter life, backwashing period, backwashing amount, etc. of the media in the depth compression device of the media compression method for a long time. It can be seen that the size, etc. have a significant effect on the filtration items. Particularly, according to the method of the present invention, it is combustible by heat-treating synthetic fiber yarn, plywood the combustible synthetic resin fiber, and the constant vertically by vertical yarn A rope is formed by winding spirally while forming a knot at intervals, and the formed rope is cut to a constant length around the knot, and the heat treatment of the cut rope consists of a central part (nucleus) and an outer circumference (envelope) surrounding the core. The media with higher density than the outside were manufactured, and the media of specific size was used as the media for the depth filtration of the media compression method. That represents a significant improvement in treatment effect was found.

The present invention is composed of a core having a diameter of 3 to 7mm and the outer shell surrounding the core, the core is denser than the outer shell, the total diameter is 10 to 20mm, the density is 55 to 75g / l, the material is a spherical filter for spherical fiber yarn Provide media.

Figure 1a is a cross-sectional view of the filter medium according to the present invention before it is compressed in the filter medium depth filter.

Figure 1b is a cross-sectional view of the filter medium according to the present invention after it is compressed in the filter medium depth filter.

Figure 2 shows a process of twisting synthetic resin fiber yarn for use as a material for producing the media according to the present invention.

3 is a front view of a rope formed in the process of manufacturing the filter medium according to the present invention.

Figure 4 shows the rope formed in the process of manufacturing the filter medium according to the invention is cut at regular intervals around the knot.

Figure 5 is a block diagram of a device for manufacturing a rope formed in the process of manufacturing the filter medium according to the present invention.

Figure 6 shows the pressurized state of the media according to the present invention in the filtration process during the treatment.

Figure 7 shows the backwash after washing with the restoration of the filter medium according to the present invention in the backwashing process during the treatment process.

8 is a cross-sectional view of a filtration apparatus in which compression and filtration are downflow, and the filter medium is packed and compressed according to the present invention.

9 is a cross-sectional view of a filtration apparatus in which compression is an upflow type and filtration is a downflow type, in which a filter medium is packed and compressed according to the present invention.

Figure 10 illustrates the processing by the filter device filled with the filter according to the present invention the compression and filtration is a downflow.

<Description of the symbols for the main parts of the drawings>

100: media 101: jacket

102: nuclear 200: cylinder

201: strand 202: fiber yarn

203: inside 204: hot plate

300: rope 301: horizontal line

302: vertical lines 303, 305: knot

304: spiral 401: string

402: inlet 403: fixture

404, 405: Yarn 406: Cutting Machine

501: filter barrel 502: water supply pipe

503: water entry and exit 504: backwash treatment pipe

505: hole 506: porous plate

507: lifting plate 508: through hole

509: lifting shaft 510: jockey

511: media 601: filter barrel

602: water supply pipe 603: water access pipe

604: backwashing pipe 607: lifting plate

608: through hole 609: lifting shaft

610: jockey 611: air supply pipe

612: Media 615: Hole

616: perforated plate

The present invention relates to a filter medium used in the filter medium compression depth filter, the broadest range is made of synthetic resin fiber yarns composed of a core having a large diameter of 3 to 7mm and a small outer shell surrounding the diameter 10 To 20 mm and a density of 55 to 75 g / l to provide a spherical media.

According to the present invention, the media consisting of the nucleus and the shell and the density of the nucleus is greater than the density of the envelope are basically contaminated water flows between the media of the media during the filtration process, while the skin acts as a filter layer while the core inside the media acts as a void. Contaminants are attached and filtered between the filter and the filter media, resulting in high filtration efficiency, large air flow gaps, and constant flow paths, resulting in low fluid pressure (approximately 1 kg / cm ² ) and low inlet pumps. Because of the lift, the power cost is reduced, the flow rate can be operated quickly (20 to 40m ³ / m ² · HR), and the filtration device has a small cross-sectional area, which provides the effect of reducing the installation area. In addition, the filter medium according to the present invention has a large backwashing space during the backwashing process and is agitated with water and air, so that the contaminants attached to the filter material are easily detached, the backwash pump capacity is small (backwash pressure of 0.3kg / cm ² or less), and low The use of backwash pump in the head saves the power cost, and the long life span of the filter provides about 5% to 10% replenishment per year and 100% replacement in about 3 to 5 years.

According to the present invention, if the size of the filter medium is too small, the filter medium may be caught or pulled out between the porous plate and the inside of the filter tube, and the overall treatment efficiency is very low. On the other hand, if the media is too large, it will not recover well and will not compress well.

The filter medium of the present invention is composed of a core having a diameter of 4 to 6 mm and an outer shell surrounding it, and having a diameter of 14 to 16 mm and a density of 63 to 64 g / l, recovery and compression are good and show particularly excellent processing efficiency. Accordingly, the present invention, in a particularly preferred embodiment, is made from synthetic resin fiber yarn, consisting of a core of 4 to 6 mm in diameter and the outer shell surrounding the spherical filter medium having a diameter of 14 to 16 mm and a density of 63 to 64 g / l To provide.

The filter medium of the present invention is manufactured using a synthetic resin fiber yarn as a raw material through a twisting step, a braiding step, a rope forming step, a cutting step and a heating step. Accordingly, the present invention, in a particular embodiment, the synthetic resin fiber yarn is heat-combusted, weaving the twisted synthetic resin fiber yarn, spirally wound to form a rope while forming a knot at regular intervals in a vertical line that is plyed in the horizontal yarn , The formed rope is cut to a predetermined length around the knot, and is manufactured by heat-treating the cut rope, and composed of a core having a diameter of 3 to 7mm and the outer shell surrounding the core, the core is denser than the outer shell, and the entire diameter is 10 to 20 mm, the density is 55 to 75 g / l, the material provides a spherical filter medium for the filter device is a synthetic fiber yarn.

In a more preferred embodiment, the present invention is heat-treated by synthetic resin fiber yarn, and weaving the synthetic resin fiber yarn, wound by spirals while forming a knot at regular intervals with a vertical string, which is spliced in a horizontal row of yarn, and formed a rope, The rope is cut to a constant length around the knot, and is manufactured by heat-treating the cut rope, which is composed of a core having a diameter of 4 to 6 mm and an outer shell surrounding the core. The core is denser than the outer shell and has a total diameter of 14 to 16 mm. It has a density of 63 to 64 g / l, the material provides a spherical filter medium for filtration device is a synthetic fiber yarn.

According to the present invention using a synthetic resin fiber yarn is a basic method of manufacturing the filter medium of the present invention is composed of a relatively dense nucleus and a relatively dense outer shell is wound by forming a knot by winding a vertical fibrous yarn on a horizontal fibrous yarn These knots form a dense nucleus and the two horizontal lines of the knot consist of a sheath. In the finished spherical media of the present invention the diameter of the nucleus is approximately equal to the width of the knot formed in the manufacturing process.

Synthetic resin fiber used to prepare the media of the present invention includes nylon, polyester, polypropylene, polyethylene, PVC, PVDC, and the like, preferably polypropylene.

Referring to the accompanying drawings, the manufacturing process of the present invention according to the present invention by way of example as follows.

The first step in the process for producing the media of the invention is a combustion process. The heat treatment is performed at a temperature of about 60 ° C. to 80 ° C. in a step of applying heat to the synthetic resin fiber yarn to change it into a flexible state. Typically, the thickness of one strand of synthetic fiber yarn is 7 to 8 denier, preferably 7.70 denier (specific gravity 0.91). In consideration of the convenience of operation, the synthetic fiber yarn is typically passed by passing about 10 strands of the synthetic fiber yarn at a rate of about 1 to 2 seconds / 0.5m through a cylinder heated to a temperature of about 60 ° C to 80 ° C. do. FIG. 2 shows virtually the synthetic fiber yarn 202 that has been combusted after multiple strands of synthetic fiber yarn 201 pass through the interior 203 of the cylinder 200 heated by the hot plate 204.

The second step of the method for producing the media of the present invention carried out following the combustion process is a process of weaving the combustible synthetic fiber fibers. This process involves winding multiple strands of combustible resin fiber together, typically for the convenience of post-working, in two types of yarn, one of which is 100 strands of combustible yarn and another of 1,000 strands of twisted fiber. Jointly. As described below, the type of twisted 100 strands of yarn is used as the vertical string 302 while the type of twisted 1,000 strands of yarn is used as the horizontal string 301.

The third step of the method of manufacturing the media of the present invention is a process of manufacturing the rope (300). The rope 300 spirals while forming a knot of vertically stranded synthetic resin fiber yarn corresponding to about 1/10 of a horizontal long fiber yarn bundle composed of a plurality of strands of synthetic resin fiber yarn. It is made by winding. For example, one thousand knots of twisted synthetic fiber fibers are wound vertically on a tight horizontal line consisting of 17,000 stranded synthetic resin fiber yarns to form a first knot, and then 100 strands of twisted synthetic fiber fibers are spirally wound at four intervals. After winding, wound 1,000 strands of combustible synthetic fiber yarn at a distance from the first knot position to form a second knot, followed by winding 100 strands of combustible synthetic fiber yarn in the same manner, followed by winding the first knot and second The rope 300 is manufactured by repeating the knot formation of 1,000 strands and the four spirals of 100 strands by forming a third knot at the same position as the spacing between knots.

More specifically with reference to FIGS. 3 and 5, 17 strings 401 are introduced into the inlet 402 from 17 yarns 404, each of which is fabricated with 1,000 strands of combustible synthetic fiber fibers. 17,000 strands of horizontal line 301 is tightly fixed by the fixing device (403). The horizontal line 301 is wound around the horizontal line 301 while rotating one yarn 405 in which 100 strands of combustible synthetic fiber fibers are spun together. Initially, the yarn 405 rotates 10 times to form 1,000 vertical string knots 303 of synthetic resin fibers twisted on the horizontal string 301, and then the horizontal string 301 is moved forward while the holder 403 rotates. While 100 strands of vertical lines are wound in a horizontal line spiral (304). This process is automatically repeated to form the rope 300, with the spacing between the knots 303 and 305 formed at this time being typically about 23 mm.

The fourth step of the method of making the media of the invention is the cutting of the rope. The rope produced is cut at the center position between the knot and the knot, ie in the middle of the second and third spirals. By this cutting process, the horizontal lines and the vertical lines are simultaneously cut, and the horizontal yarns, which were tight around the knots formed by the vertical lines, are retracted with flexibility.

Referring to Figures 3 to 5 in more detail as follows. At regular intervals on the 17,000 strands 301, typically at 23 mm intervals, the center of the knot 303 and the knot 305 formed by the 1,000 strings is cut by the cutter 406, resulting in The rope is cut to 23 mm in length, and both rows of about 9 mm and 17,000 strands, respectively, around the knot 305 are contracted with flexibility to obtain a cut in the form as shown in FIG. 4.

The final step of the process for producing the media of the present invention is to heat the rope, which has been cut to a constant size around the knot. The heat treatment is carried out for about 5 minutes at a temperature of about 60 ℃ to 80 ℃. The rope cut by this heat treatment turns into a sphere and forms a slightly hard (high density) nucleus 102 by a knot 303 in the center of the sphere, and the plurality of horizontal lines 301 are thermally bonded to each other and at the same time knot 303 The outer shell 101 is formed while being thermally fused with the shell. This thermal fusion of the fiber yarns prevents the knot from being loosened, completing the spherical media of the present invention consisting of a dense core and a dense sheath. Most preferably, the diameter of the nucleus and the width of the shell are each about 5 mm, and the diameter of the spherical media thus formed is about 15 mm.

The media produced in accordance with the present invention can be used in any type of filtration device in which various types of compression and filtration methods are harmonized, including the depth filter of the median compression method illustrated herein. These various types of filtration devices are disclosed in Korean Utility Model Publications 2019980059171, 2019980059172 and 2019980059173 and Korean Utility Model Publication 2019990033489, filed on October 26, 1998, filed by the applicant of the present invention. . The entire contents of these publications are incorporated herein by reference. The filtration device in which compression and filtration are downflow, and the filtration device in which filtration is downflow and the compression is upflow is summarized as follows.

Filtration unit with compression and filtration downflow

As shown in FIG. 8, the media 511 inside the filter barrel 501 are pressed by a lifting plate 507 lowered by the jockey 510 in the filter barrel 501.

Therefore, by the pressing force of the elevating plate 507, the filter medium 511 is lowered to the lower part inside the filter cylinder 501 to be compressed between the porous plate 506 and the elevating plate 507 while maintaining a tight gap. do.

At this time, open the valve to supply the raw water not filtered through the water supply pipe 502 into the filter 501, the raw water supplied into the filter 501 through the through hole 508 of the elevating plate 507 As it descends to the lower side of the filter medium (511) through the sheath (filtration layer) is to escape.

Therefore, foreign matters included in the raw water passing through the compressed media 511 are absorbed and filtered by the media 511 so that clean filtered water can be supplied to the water entry pipe 503.

In the above process, since the backwashing pipe 504 maintains the locked state, the raw water supplied to the water supply pipe 502 is filtered without being drained to the backwashing pipe 504.

On the other hand, the filter medium 511, which filtered the raw water supplied into the filter 501 as described above is in a state in which the impurities contained in the water is buried to be able to perform the following filtration action. When washing the filter medium 511, the valve of the water supply pipe 502 is closed, the filter medium 511 is compressed and the lifting plate 507, which is lowered, is raised by the reverse operation of the jockey 510. As a result of the elevation of the elevating plate 507, the space inside the filter barrel is widened.

Subsequently, the valve of the backwashing pipe 504 is opened, and water and air are supplied into the filter barrel 501 through the hole 505 of the porous plate 506 through the water access pipe 503. ) Are vortexed with water and air as they expand and restore to their original state.

At this time, the filter medium 511 vortexed together with the water supplied to the filter 501 drops the foreign matter buried, the foreign matters from the filter medium 511 backwashed with the washing water through the through hole 508 of the lifting plate 507 It is discharged to the processing tube 504.

Filtration device with filtration downflow and compression upflow

As shown in FIG. 9, the media 612 inside the filter barrel 601 are pressed by a lifting plate 607 lifted by the jockey 610 in the filter barrel 601.

Accordingly, by the pressing force of the elevating plate 607, the filter media 612 is raised to the upper portion of the inside of the filter barrel 601 to be compressed between the porous plate 616 and the elevating plate 607 to maintain a tight gap. do.

At this time, when the raw water is not filtered through the water supply pipe 602 to open the filter 601 through the water supply pipe 602, the raw water supplied into the filter 601 through the hole 615 of the porous plate 616. And it is drawn out through the through hole 608 of the elevating plate 607 through the outer cover of the filter medium (612).

Therefore, foreign matters contained in the raw water passing through the compressed media 612 are absorbed and filtered by the media 612 so that clean filtered water can be supplied to the water entry pipe 603.

In the above process, since the backwashing pipe 604 and the air supply pipe 611 maintain the locked state, the raw water supplied to the water supply pipe 602 is not drained to the backwashing pipe 604 and the air supply pipe 611. All are filtered.

On the other hand, the filter medium 612, which filtered the raw water supplied into the filter 601 as described above is in a state that the impurities contained in the water is buried to be able to perform the following filtration action.

That is, when washing the filter medium 612, the valve of the water supply pipe 602 is closed, and the lifting plate 607 which compresses the filter medium 612 is lowered by the reverse operation of the jockey 610. As a result of the lowering of the elevating plate 607, the space inside the filter barrel is widened.

Subsequently, the valves of the backwashing pipe 604 and the air supply pipe 611 are opened, and when the air and water are supplied into the filter barrel 601 through the water entry and exit pipe 603, the media 612 in the filter barrel 601 widened. They are vortexed by water and air as they expand and restore to their original state.

At this time, the filter medium (612) vortexed by the water and air supplied to the filter 601 drop the foreign matter buried, foreign matters falling from the filter medium (612) and the wash water through the hole 615 of the porous plate 616 Together with the backwashing pipe 604 is discharged.

Therefore, the filter medium 612 can be cleaned by the backwash water and air, so that the water supplied in the next filtration process can be reliably filtered.

Accordingly, the present invention, in another aspect, consists of a nucleus with a diameter of 3 to 7 mm, particularly preferably 4 to 6 mm, and a sheath surrounding it, the nucleus being denser than the sheath, having a diameter of 10 to 20 mm, particularly preferably 14 To 16 mm, the density is 55 to 75 g / l, particularly preferably 63 to 64 g / l, and the material is a water supply pipe positioned on one side of the cylindrical chamber with raw water containing spherical media made of synthetic fiber yarn therein. Received through the (502) and drained the filtered water downwards to the water inlet pipe 503 located on the bottom of the cylindrical chamber and the backwash water supplied back to the water outlet pipe 503 to the opposite side of the water supply pipe (502) Filter 501 configured to discharge to the backwashing pipe 504 located, and the lower side of the filter to prevent the filter medium 511 inside the filter 501 to flow out into the water entry pipe 503 with the filtered water outside Perforated plate 506 having a plurality of holes 505 provided in the edge and the filter medium 511 inside the filter 501 to prevent the water supply pipe 502 and backwashing tube 504 with the filtered water to flow out An elevating plate 507 having a plurality of through holes 508 to pressurize the media 511 downward, and an elevating plate 507 connected to the elevating plate 507 to elevate the elevating plate 507 inside the filter barrel 501. The shaft 509, and the lifting plate 507 and the lifting shaft 509 to raise and lower the jack 510 is provided, characterized in that the compression and filtration is provided with a downflow filter device.

The present invention, in another further aspect, consists of a nucleus with a diameter of 3 to 7 mm, particularly preferably 4 to 6 mm and a sheath surrounding it, the nucleus being denser than the sheath and having a diameter of 10 to 20 mm, particularly preferably 14 To 16 mm, the density is 55 to 75 g / l, particularly preferably 63 to 64 g / l, and the material is a water supply pipe positioned on one side of the cylindrical chamber with raw water containing spherical media made of synthetic fiber yarn therein. Received through 602 to drain the filtered water downward to the water inlet pipe 603 located at the bottom of the cylindrical chamber and the backwash water supplied back to the water outlet pipe 603 to the opposite side of the water supply pipe 602 A plurality of through holes in order to prevent the filter 601 and the filter medium 612 inside the filter 601 and the filtered water duct 603 to be discharged to the water entry pipe 603 to be discharged to the backwashing pipe 604 is located. (608) Lifting plate 608 for upwardly pressurizing the filter medium, and the filter medium 612 inside the filter barrel 601 is prevented from flowing into the water supply pipe 602 and the backwashing pipe 604 together with the backwash water. A perforated plate 616 positioned directly below the water supply pipe 602 and the backwashing pipe 604 in a state where the hole 616 is formed, and the filter tank to change the water flow inside the filter tank 601. An air supply pipe 611 for supplying air to the inside and a lifting shaft 609 connected to the lifting plate 607 so as to lower the lifting plate 607 inside the filter barrel 601, And a jockey 610 for lowering the connected elevating plate 607 and the elevating shaft 609 to provide a filtration device in which the compression is upflow and the filtration is downflow.

The filtration process using the filter medium according to the present invention is composed of a stop, pressurization start, filtration process, depressurization and backwashing process and Figure 10 illustrates a filtration device for each process sequence. The stop state is an operation stop state or maintenance preservation state of the filtration apparatus. Pressurization starts by pressing the media with a piston. 1B virtually shows the state in which the filter medium 100 according to the present invention is compressed by a piston. The nucleus 102 serves to maintain a pre-compression state even when the media is compressed, thereby forming a conduit (pore) through which contaminated water can flow and maintaining a filtration pressure of about 1 kg / cm ² or less. The outer shell 101 surrounding the nucleus serves as a filter layer for filtering contaminants while passing through the contaminated water. The filtration process sends raw water and starts filtration when the piston reaches the lower limit, and stops filtration when the raw water inlet pressure reaches a predetermined pressure. 6 shows a virtual illustration of the water treatment by the filter medium according to the present invention during the filtration process. Depressurization is a process of raising the piston upward when the compression pressure reaches a predetermined value. The backwashing process starts backwashing by injecting backwashing water and air when the piston reaches the upper limit, and the solid matter attached to the filter medium is detached by agitation and vibration and flows out to the backwashing water outlet. 7 is a virtual illustration of the backwash after wash by the filter medium according to the present invention during the backwashing process.

The invention will be more specifically illustrated by the following examples. However, these examples are merely embodiments of the present invention and do not limit the scope of the present invention.

<Example>

The thickness of the filtrate was prepared using a polypropylene fiber yarn having a thickness of 7.70 denia. The density of the media was about 63 to 64 g / l and the treatment efficiency was tested by varying the size.

A pilot of a filtration device (filtration and compression downflow) of 500 mm in diameter and 1530 mm in height (3,000 mm including cylinder length) was installed at the sewage treatment plant in Gonjiam, Gwangju, Gyeonggi-do, Korea, and treated with raw water of sedimentation tank as raw water. .

The media was filled up to 1 m from the lower perforated plate of the pilot and the compression was 50%. The filtration time was 20 hours for 4 hours and the backwash time for 20 minutes. The backwashing method was carried out as follows. Shut down the raw water pump. When the upper perforated plate connected to the piston shaft reaches the upper point, air is supplied for 2-3 minutes to desorb the contaminants attached to the media. Stop air injection. The media floats to the top and drains the water from the bottom. Backwash and air are fed together for 3 minutes. At this time, the backwash water is discharged through the backwash waste water pipe. This process is repeated 2-3 times.

The processing efficiency is calculated by the following equation:

Treatment efficiency = (raw SS-treated water SS) ÷ raw SS × 100

The results are listed in Table 1 below.

Table 1

Media diameter (mm) 12 14 15 16 18 20 Nuclear diameter (mm) 4 4 5 6 6 6 SS treatment (%) 90 97 98 96 91 89

From the above results, it can be seen that the size of the media and the nucleus inside the media have a significant effect on the treatment efficiency. In particular, the treatment efficiency is remarkably high in the range of 14 to 16 mm in diameter and 4 to 6 mm in diameter. have.

From the above description, those skilled in the art will appreciate that the present invention can be implemented in other specific forms without changing the technical spirit or essential features. In this regard, it should be understood that the embodiments and experimental examples described above are illustrative in all respects and not restrictive. The scope of the present invention should be construed that all changes or modifications derived from the meaning and scope of the appended claims and their equivalents, rather than the detailed description, are included in the scope of the present invention.

The media according to the invention have good recovery and compression and provide good processing efficiency.

Claims (5)

A core having a diameter of 3 to 7 mm and an outer shell surrounding the core, the core having a greater density than the outer shell, having a total diameter of 10 to 20 mm, a density of 55 to 75 g / l, and a material of synthetic fiber fibers. The method of claim 1, wherein the synthetic resin fiber yarn is heat-treated and twisted, the twisted synthetic resin fiber yarn is woven, the rope is wound by spiral to form a knot at regular intervals with a vertical string ligated to the fused horizontal line, and the formed rope is A media produced by heat treatment of the cut rope with a fixed length centering on the knot. The media of claim 1 or 2, wherein the nucleus has a diameter of 4 to 6 mm, a total diameter of 14 to 16 mm, and a density of 63 to 64 g / l. Consists of a core with a diameter of 3 to 7mm and an outer shell surrounding the core, the core having a greater density than the outer shell, a diameter of 10 to 20mm, a density of 55 to 75g / l, and a material containing a spherical filter material made of synthetic fibers. Raw water is supplied from the water supply pipe 502 located on the upper side of the cylindrical chamber in the drainage of the filtered water downward to the water entry pipe 503 located at the bottom of the cylindrical chamber and the reverse supply to the water entry pipe 503 And a filter barrel 501 configured to discharge the backwashed water to the backwashing tube 504 located on the opposite side of the water supply pipe 502, and the filter medium 511 inside the filter barrel 501 together with the filtered water. The porous plate 506 having a plurality of holes 505 provided in the lower outer periphery of the filter barrel and the filter medium 511 inside the filter barrel 501 together with the filtered water to prevent the outflow to the entrance pipe 503. Supply pipe 502 and backwashing In order to prevent the outflow to the pipe 504, the lifting plate 507 for pressing down the filter medium 511 and the lifting plate 507 to raise and lower the inside of the filter barrel 501 A lifting shaft 509 connected to the lifting plate 507 and a jockey 510 for lifting up and down the lifting plate 507 and the lifting shaft 509 connected to each other. Filtration device. Consists of a core with a diameter of 3 to 7mm and an outer shell surrounding the core, the core having a greater density than the outer shell, a diameter of 10 to 20mm, a density of 55 to 75g / l, and a material containing a spherical filter material made of synthetic fibers. Raw water is supplied from the water supply pipe 602 located on one side of the upper side of the cylindrical chamber to drain the filtered water downward to the water entry pipe 603 located at the bottom of the cylindrical chamber and back supply to the water entry pipe 603. And a filter barrel 601 configured to discharge the backwashed water to the backwashing tube 604 located on the opposite side of the water supply pipe 602 and the filter medium 612 inside the filter barrel 601 together with the filtered water. A lifting plate 607 for upwardly pressurizing the filter medium with a plurality of through holes 608 so as to prevent the outflow to the entrance pipe 603, and the filter medium 612 inside the filter barrel 601 together with backwashing water (602) and backwashing pipes (604) Perforated plate 616 and the filter barrel 601 which is located directly below the water supply pipe 602 and the backwashing pipe 604 in a state in which a plurality of holes 616 are formed to prevent the outflow to An air supply pipe 611 for supplying air into the filter barrel 601 to change the water flow therein, and a lift plate connected to the lift plate 607 so as to lower the lifting plate 607 inside the filter barrel 601. And a shaft (609), a lifting plate (607) connected to each other, and a jockey (610) for lowering the lifting shaft (609), wherein the compression is an upflow type and the filtration is a downflow type filter device.