WO2004071621A1 - A filter in a spiral type forming a plurality of prominence and depression in the form of the rib of a fan in turn on surface and manufacturing method and machine therefor - Google Patents

A filter in a spiral type forming a plurality of prominence and depression in the form of the rib of a fan in turn on surface and manufacturing method and machine therefor Download PDF

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Publication number
WO2004071621A1
WO2004071621A1 PCT/KR2004/000304 KR2004000304W WO2004071621A1 WO 2004071621 A1 WO2004071621 A1 WO 2004071621A1 KR 2004000304 W KR2004000304 W KR 2004000304W WO 2004071621 A1 WO2004071621 A1 WO 2004071621A1
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WO
WIPO (PCT)
Prior art keywords
filter
workpiece
rotating
rotation
pulley
Prior art date
Application number
PCT/KR2004/000304
Other languages
French (fr)
Inventor
Dong-Ho Bae
Original Assignee
Dhinternational Co., Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from KR10-2004-0006752A external-priority patent/KR100475171B1/en
Application filed by Dhinternational Co., Ltd filed Critical Dhinternational Co., Ltd
Priority to EP04711316A priority Critical patent/EP1644099A4/en
Publication of WO2004071621A1 publication Critical patent/WO2004071621A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D39/00—Filtering material for liquid or gaseous fluids
    • B01D39/14—Other self-supporting filtering material ; Other filtering material
    • B01D39/16—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres
    • B01D39/1607—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres the material being fibrous
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D1/00—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor
    • B26D1/01—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work
    • B26D1/04—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a linearly-movable cutting member
    • B26D1/06—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a linearly-movable cutting member wherein the cutting member reciprocates

Definitions

  • the present invention pertains, in general, to a spiral filter, on a surface of which a plurality of prominences and depressions are alternatively formed at regular intervals like ribs of a folding fan, and a method and a device for producing the same. More particularly, the present invention relates to a spiral filter, on a surface of which a plurality of prominences and depressions are alternatively formed at regular intervals like ribs of a folding fan, and a method and a device for producing the same using a bite, reciprocating by converting a high-speed rotating motion into a high-speed reciprocating motion.
  • wastewater treatment processes include chemical treatment processes, a gas treatment process using ozone or chlorine gas, a neutralization process, and an agglomeration process, biological treatment processes such as a process using a bio-layer, a catalytic oxidation process, an activated sludge process, a special biological treatment, an anaerobic treatment process, physical treatment processes such as sedimentation, a filtration, an adsorption, a floating, a membrane treatment process, and a mixture of processes thereof.
  • a sand or a carbon filter, a reverse osmotic membrane, a ultrafiltration membrane, and an ion- exchange membrane widely are used in a physicochemical treatment process, and plastics, activated carbons, bio-ceramics, clays, sands, and gravels are usually used in a treatment process using a filter.
  • the above processes have disadvantages including high treatment costs, poor attachment of organics and microorganisms to the filter, the filter having a relatively small surface area and also poor durability. In other words, the pores and grooves of the filter are frequently clogged, the filter must be frequently replaced with a new one, it is difficult to install the filter when treating the wastewater, and the increase in the surface area of the filter is limited.
  • Biological treatment processes using the microorganism are advantageous in that the water is purified without using chemicals so as to minimize further water pollution due to the chemicals that purify the water.
  • the core technology of the biological treatment process depends on the development of a filter which contains a microorganism to react with wastewater.
  • the above biological treatment processes are mainly used to purify sewage, and can be widely used in fishfarms and aquariums, purify water used in hydroponics, and to purify drinking water.
  • Examples of the biological treatment processes include a honeycomb process and a process using a rotating biological contactor.
  • biological treatment processes are usually used to reduce the content of organics in wastewater, but are currently applied to remove ammonium (nitration), nitrogen due to denitrification, and phosphorus.
  • biological treatment processes may be classified as an aerobic wastewater treatment process or as an anaerobic wastewater treatment process.
  • the microorganism requires oxygen.
  • the microorganism should be used under an oxygen-free environment.
  • the aerobic wastewater treatment process has advantages in that the treatment time for purifying the wastewater is short, the organics are almost completely removed, and the equipment used in the aerobic wastewater treatment process occupies a relatively small area in comparison with the anaerobic wastewater treatment process.
  • examples of widely used aerobic wastewater treatment process include an activated sludge process, a rotating biological contactor process, and a bio-layer process such as a sprinkling filter process.
  • the rotating biological contactor is advantageous in that the retention time of the reaction bath is short, it is not necessary to transport the water and the sludge, the rotating biological contactor can be applied to wastewater in which the quality of water is greatly changed, less energy is used compared to the activated sludge process, and the devices in the biological contactor operate easily.
  • the rotating biological contactor emits a bad odor and operates difficultly during cold weather.
  • the sprinkling filter process in which wastewater is sprayed into a filter made of stones or plastic in a tank has some advantages and disadvantages.
  • construction and maintenance costs of devices used in the sprinkling filter process are low, the wastewater is aerated without power, the sprinkling filter process is less vulnerable to the quality and amount of wastewater, and a great number of microorganisms exist in the filter. Therefore, it is not necessary to transport the sludge, as it is less influenced by temperamental changes, thus the swelling of the sludge does not occur, and it is easy to operate the devices.
  • the bio-layer filter used to biologically purify wastewater is produced by attaching microorganisms to a filter and propagating the microorganism on a surface of the filter, and is used in a contact oxidation process which decomposes organic contaminants contained in the wastewater.
  • a contact oxidation process which decomposes organic contaminants contained in the wastewater.
  • the bio-layer filter is classified into a fixed-phase bio-layer filter and a fluidized-phase bio-layer filter.
  • the fixed-phase bio-layer filter is disadvantageous in that its installation cost is high, it takes a long time to install the fixed-phase bio-layer filter, the fixed-phase bio-layer filter may hinder the mending of an aeration device, and it is difficult to additionally install more fixed-phase bio-layer filters.
  • the fluidized-phase bio-layer filter has advantages in that it is easy to install the fluidized-phase bio-layer filter because the filter is packed in a reaction bath without additional devices, and the amount of the filter packed in the reaction bath is easily controlled because it is easy to additionally pack the filter in the reaction bath or remove the filter from the reaction bath. Accordingly, the use of the fluidized-phase bio-layer filter is on an increasing trend.
  • a conventional carrier, made of a synthetic resin material, used to filter suspended and alien substances contained in a liquid is disclosed in Japanese Pat. Laid-
  • Open Publication No. Hei. 7-75712 which is produced by continuously bending the upper end part of a folding fan-shaped board into a shape of a letter S and subsequently repeatedly coiling the resulting board to form a spiral body in which the lower end part of the board is positioned at the central axis of the spiral body.
  • the spiral carrier is produced by cutting the rotating synthetic resin material clamped with a chuck of a lathe using a reciprocating bite.
  • the conventional spiral carrier has a smooth surface, the attachment of bacteria to the surface of the conventional carrier is insufficiently maintained and bacteria thus easily separates from the carrier during a back washing process.
  • Korean Utility Model Registration Publication No. 20-0209344 discloses a conventional carrier with a wrinkled surface, instead of a smooth surface, to ensure a relatively enlarged surface area.
  • Japanese Pat. Laid-Open Publication No. Hei. 7-275876 recites a bacteria culture filter, which has a surface wrinkled by moving a bite to cut a synthetic resin material clamped with a chuck of a lathe while controlling the rotation speed of the chuck and the movement speed of the bite.
  • the synthetic resin material is cut, the surface of the synthetic resin material is cracked to form a plurality of grooves at irregular intervals on the surface of the synthetic resin material, thereby the bacteria culture filter has a wrinkled surface.
  • lengths and shapes of the grooves are different from each other.
  • the bacteria culture filter has a disadvantage in that the attachment of bacteria to the surface of the filter is insufficiently maintained and bacteria is easily separated from the bacteria culture filter during a back washing process. Even though more bacteria is attached to the wrinkled surface of the bacteria culture filter than in the case of the filter having the smooth surface after the backwashing process, the bacterium are easily separated from the bacteria culture filter during the backwashing process because of the irregular shapes of the wrinkles, the irregular intervals between the wrinkles, and shallow depths of the grooves. Accordingly, wastewater is insufficiently purified in the case of using the above bacteria culture filter.
  • an objective of the present invention is to provide a sphal filter, which has a relatively large surface area, and which is applied to a contact oxidation process of decomposing organic contaminants contained in wastewater, in addition to filtering dust and contaminated gases contained in atmospheric air, and a method and a device for producing the same.
  • microorganisms contained in the wastewater are easily and firmly attached to the surface of the spiral filter, a bio-layer is scarcely separated from the surface of the spiral filter, and an attachment of the bio- layer to the surface of the spiral filter is maintained for a relatively long term.
  • FIG. 1 is a perspective view of a device for producing a spiral filter, on a surface of which a plurality of prominences and depressions are alternately formed at regular intervals like ribs of a folding fan, according to the present invention
  • FIG. 2 is a partially enlarged view of the device of FIG. 1, which shows the conversion of rotation motions of driving and slave pulleys into a reciprocating motion;
  • FIG. 3 illustrates an eccentric rotation locus of an eccentric cam around the center of the slave pulley;
  • FIG. 4 illustrates workpieces clamped with chucks of FIG. 1 ;
  • FIG. 5 illustrates a filter according to the present invention
  • FIG. 6 illustrates an interior section of the filter according to the present invention
  • FIG. 7 is a plan view of the filter according to the present invention. Best Mode for Carrying Out the Invention
  • the present invention provides a method of producing' a spiral filter, on a surface of which a plurality of prominences and depressions are alternatively formed at regular intervals, like ribs of a folding fan.
  • the method includes rotating the workpiece while the first end of the workpiece is clamped with a chuck and the second end of the workpiece is supported by a plurality of rotation guide rollers to guide the rotation of the workpiece; rotating the first driving pulley using the first motor to bring about the rotation of the first driving belt, leading to the rotation of the first slave pulley; converting the rotating motion of the first slave pulley into a reciprocating motion of a link body through an eccentric cam; cutting the rotating workpiece using a reciprocating bite connected to the link body; and controlling movement of the bite in accordance with a length change in the workpiece due to it.
  • the controlling movement of the bite is performed in such a way that the second driving pulley, the second driving belt, and the second slave pulley are rotated by the second motor to initiate the rotation of a lead screw to move the main body, leading to s ⁇ nultaneous movement of a supporting plate, a supporting member, the first driving pulley, the first slave pulley, the eccentric cam, and the link body, connected to the main body, thereby moving the bite.
  • the present invention provides a device for producing a spiral filter, on a surface of which a plurality of prominences and depressions are alternatively formed at regular intervals, like ribs of a folding fan.
  • the device includes a chuck rotating by the third motor while clamping to the first end of a workpiece.
  • a plurality of rotation guide rollers are in contact with an external surface of a second end of the workpiece, which is clamped at the first end with the chuck, to guide rotation of the workpiece.
  • the first driving pulley rotates by the first motor, and the first slave pulley rotates by rotation of the first driving belt due to rotation of the first driving pulley.
  • an eccentric cam converts the rotating motion of the first slave pulley into a reciprocating motion
  • a link body reciprocates by converting the rotation motion of the first slave pulley into the reciprocating motion using the eccentric cam.
  • a supporting guide guides the reciprocating motion of the link body while supporting the link body.
  • a bite is connected to the link body and reciprocates to cut the rotating workpiece.
  • the main body is united with the supporting guide through a supporting plate to be moved in accordance with a length change in the workpiece due to cutting it. In this regard, the workpiece rotating by the chuck is cut using the reciprocating bite, thereby producing the spiral filter.
  • the eccentric cam is eccentrically connected to the first slave pulley in such a way that a center of the first end of the eccentric cam is spaced from a center of the first slave pulley, and that the second end of the eccentric cam is connected to the link body through a rotation link.
  • the bite has an edge with an arched line, and cuts the workpiece while being in contact with a radius line of an end surface of the second end of the workpiece.
  • the device further includes the second motor, the second driving pulley rotating by the second motor, the second slave pulley, the second driving belt to connect the second driving and slave pulleys, and a lead screw connected to the second slave pulley so as to move the main body.
  • the workpiece is shaped like a rod, and the sectional shape of the workpiece is a circle or a polygon.
  • the workpiece is made of a synthetic resin or a nonferrous metal.
  • the present invention provides a filter produced according to the method of claim 1, in which the workpiece constituting the filter is continuously bent in an S-shape to form S-shaped portions.
  • the S-shaped portions each have a tapered structure like a folding fan.
  • the workpiece having the S-shaped portions is coiled numerous times to form a spiral body, and a plurality of prominences and depressions are alternatively formed at regular intervals, like ribs of the folding fan, on the surface of the workpiece.
  • upper end portions of the S-shaped portions of the workpiece are angulated at regular intervals by the prominences and depressions alternatively formed at regular intervals on the surface of the filter.
  • the workpiece is shaped like a rod, and a sectional shape of the workpiece is a circle or a polygon.
  • the workpiece is made of a synthetic resin or a non-ferrous metal.
  • the word "filter” is generally used to refer to a bio-layer carrier used in a contact oxidation process in which microorganisms are attached to the filter and propagated on the surface of the filter to decompose organic contaminants contained in the wastewater, and a filtering substance, having a similar shape to the bio-layer carrier, used to adsorb dust and sulfurous acid gas present in atmospheric air to filter the contaminated air unlike the bio-layer carrier.
  • the device for producing the filter according to the present invention includes chucks 13 rotating while clamping workpieces, a plurality of rotation guide rollers 26, a first driving pulley 22 and a first slave pulley 22' rotating by a first motor 20, an eccentric cam 19, a link body 29 reciprocating by use of the eccentric cam 19 to convert a rotating motion of the first slave pulley 22' into a reciprocating motion, a supporting guide 24 to guide the reciprocating motion of the link body 29 while supporting it, bites 25 connected to the link body 29 to cut the rotating workpieces (W) while reciprocating, and a main body 33 united with the supporting guide 24 by a supporting plate 27 to be moved in accordance with a length change in the workpieces (W) due to cutting it.
  • the workpieces (W) for the spiral filter according to the present invention.
  • the kind and shape of the workpieces (W) are not limited.
  • the workpieces (W) may be composed of non-ferrous metal, such as copper or aluminum.
  • each of the workpieces (W) may be shaped like a rod with its sectional shape being a polygon, such as a triangle, a tetragon, a pentagon, or a hexagon.
  • the workpieces (W) are clamped with the chucks 13 at first ends thereof, and second ends of the workpieces (W) are put between the rotation guide rollers 26 while being inserted through holes 18, 18', thereby, rotation of the workpieces (W) by the chucks 13 are guided by the rotation guide rollers 26.
  • the chucks 13 have the same shape as a typical chuck of a lathe, and function to clamp the workpieces (W). Additionally, the rotating force of the second motor 12 is transferred through the driving belt to pulleys 11, 11', and the chucks 13 rotate while clamping the workpieces (W) by rotation of the pulleys 11, 11'.
  • one motor and two pulleys have been illustrated and are used to turn the chucks 13. However, one or more motors and one or more pulleys may be used to turn the chucks 13, if necessary.
  • a plurality of rotation guide rollers 26 may be installed in the device to guide the rotation of the workpieces (W) while supporting them(W). At this time, it is preferable to install three rotation guide rollers 26 in the device. In other words, it is preferable for the workpieces (W) to rotate while being put between the three rotation of the guide rollers 26 to be guided and supported by the rotation guide rollers 26.
  • the first driving pulley 22 rotates by the turning force of the first motor 20, leading to the rotation of the first driving belt 40 to turn the first slave pulley 22'.
  • the first slave pulley 22' is supported by a supporting member 21, and the first motor 20 is connected through a separate supporter and supporting legs to a lower side of the supporting plate 27 as shown in FIGS. 1 and 2.
  • the eccentric cam 19 is eccentrically connected to the first slave pulley 22' in such a way that the center (O') of a first end of the eccentric cam 19 is spaced from the center (O) of the first slave pulley 22'. Further, a second end of the eccentric cam 19 has an opening, and is connected to the link body 29 by a rotation link
  • the supporting guide 24 is connected to a lower side of the supporting plate 27 at an upper part thereof, which supports the link body 29, and guides the reciprocating motion of the link body 29.
  • the supporting plate 27 slides along mobile sliders 28 connected to both sides of the frame of the device by two sliding protrusions formed on the supporting plate 27 and engaged with the mobile sliders 28, as shown in FIG. 2.
  • the bites 25 fixed to the link body 29 reciprocate to cut the rotating workpieces (W). It is preferable that the edges of the bites 25 are of a circular shape, but is not limited to the circular shape. In other words, the edges of the bites 25 may form various outlines, such as an oval line, a semi-circular line, an arched line with a predetermined angle, or a straight line.
  • the main body 33 is united with the supporting guide 24 through the supporting plate 27, and is screwed over the lead screw 14 so as to be moved along the lead screw
  • the second motor 17 rotates to bring about the rotation of the driving pulley 16, the driving belt, the slave pulley 15, and lead screw 14, leading to the movement of the main body 33.
  • the present invention is not limited to the movement of the main body 33 along the lead screw 14. That is to say, the movement of the main body 33 may be conducted in other manners, such as a rolling manner using a roller, or in a sliding manner.
  • a control box 30 is installed at a lateral side of the device for producing the spiral filter to independently control the rotation directions and the speeds of the motors 12, 17, 20.
  • the rotation speed of the first and third motors 20, 12 must be relatively fast because it is economic to produce a lot of filters within a unit time in a view of the productivity of the spiral filter. Additionally, it is preferable that the rotating speeds of the first and third motors 20, 12 be about 1750 and 8000 rpm, respectively, assuming that diameters of the driving and slave pulleys are about 135 and 60 mm, respectively.
  • the worker After the device is turned on, a worker must check whether the workpieces (W) are clamped with the chucks 13 or not. In the case that the workpieces (W) are not clamped with the chucks 13, the worker situates the workpieces (W) in the device in such a way that the first end of the workpieces (W) are stuck into the chucks 13 and the second end of the workpieces (W) are put between a plurality of rollers 26 while being inserted through the hole 18, 18'.
  • the control box 30 is then operated to enable the chucks 13 to clamp the first ends of the workpieces (W). Subsequently, the rotating directions and speeds of the first to third motors 20,17,12 are controlled by the control box 30.
  • the first motor 20 is operated to bring about rotation of the first driving pulley 22, leading to rotation of the first driving belt 40. Furthermore, the first slave pulley 22' rotates by the first driving belt 40. Thereafter, the eccentric cam 19 connected to the first slave pulley 22' eccentrically rotates around the center of the first slave pulley 22' to convert the rotating motion of the first slave pulley 22' into the reciprocating motion of the link body 29. At this time, the link body 29 is not vertically moved, but horizontally reciprocates in the supporting guide 24. Accordingly, the reciprocating motion of the link body 29 initiates the reciprocating motion of the bites 25, having the circular section, connected to the link body 29.
  • the reciprocating bites 25 cut the workpieces (W) while being in contact with radius lines of end surfaces of the second ends of the workpieces (W), clamped with the chucks 13 and rotating by the third motor 12.
  • the filter produced can be made of a synthetic resin such as vinyl chloride, polypropylene, and poly ehtylene, or a wasted resin thereof. Accordingly, even though filter particles are rotated in a reaction bath or collide with each other, and the filter particles collide with an inner wall of the reaction bath, the filter is not easily abraded. That is to say, the filter according to the present invention has excellent mechanical strength and durability, can be semi-permanently used, and is economical because the filter is easily obtained. Further, the size of the present invention's filter is not limited, and can be adjusted as needed.
  • the filter according to the present invention is of a spiral shape, the workpiece constituting the filter is continuously bent in an S-shape to form the S-shaped portions.
  • the S-shaped portions each have the downwardly tapered structure like a folding fan and the workpiece having the S-shaped portions is coiled numerous times to form a spiral body. Additionally, a plurality of prominences and depressions are alternatively formed at regular intervals, like ribs of the folding fan, on the surface of the workpiece, and upper end portions of the S-shaped portions of the workpiece are angulated at regular intervals by the prominences and depressions alternatively formed at regular intervals on the surface of the filter.
  • the spiral filter according to the present invention has a significantly larger surface area than a conventional filter.
  • the spiral filter of the present invention has a surface area ten times or more larger than the conventional filter, having the relatively small surface area because intervals between wrinkles and shapes of the wrinkles of the surface of the conventional filter are irregular and shallow depressions are formed on the surface of the conventional filter even though the conventional filter has the wrinkles on the surface thereof.
  • a plurality of prominences and depressions are formed on the surface of the filter of the present invention to enlarge the surface area of the filter, leading to an enlargement of the contact area between the filter and the wastewater and of the surface area to which microorganisms can be attached.
  • wastewater treatment efficiency of the filter according to the present invention is improved.
  • the filter of the present invention has an excellent physical filtration ability and is prevented from clogging due to its special structure.
  • the prominences and depressions may be formed on any one surface or on both surfaces of the workpiece constituting the filter. It is preferable that the prominences and depressions are formed on both surfaces of the workpiece for the filter.
  • the bio-layer containing the cultured bacteria is formed on both surfaces of the workpiece.
  • spaces between the neighboring walls of the prominences and depressions may be clogged because the spaces are very narrow when there are significantly lots of prominences and depressions on the surface of the workpiece.
  • intervals between the neighboring walls of the prominences and depressions must be properly controlled.
  • a whole shape of the filter of the present invention is a spiral.
  • the workpiece is bent in the S-shape to form the continuous S-shaped portions at an upper part thereof.
  • the S-shaped portions each have the tapered structure and the workpiece having the S-shaped portions is coiled numerous times in such a way that an enlarged portion of the tapered structure is located outside of the filter and a contracted portion of the tapered structure is located at an inside of the filter, thereby forming the spiral body.
  • the spiral filter includes a plurality of S-shaped portions continuously integrated with each other, and is coiled.
  • each S-shaped portion may or may not have the same size in accordance with the rotating speeds of the motors 12, 20, 17, radially arranged, and have a plurality of tapered portions by regulating the rotating velocity of motors 12, 17, 20.
  • An outward portion of the tapered portion constituting the filter is relatively large and its inward portion is relatively small.
  • the filter including the continuous S-shaped portions coiled in a spiral shape has a plurality of gaps and holes with various sizes formed therethrough.
  • the filter of the present invention has significantly larger surface than the conventional filter because the filter of the present invention has a spiral structure, and the filter of the present invention has ati enlarged surface area because the uneven wrinkles are formed on the surface of the spiral filter made of synthetic resin.
  • the increase of the filter's surface area contributes to improving the physical filtration function and enlarging a surface of the bio-layer formed on the surface of the filter to improve a biological treatment efficiency.
  • a plurality of prominences and depressions are formed on the surfaces of the S-shaped portions as a way to extend from a large portion to a small portion to guide contaminants contained in the wastewater from the large portion to the small portion, thereby aiding the attachment of the contaminants contained in the wastewater to the filter.
  • the prominences and depressions function to greatly enlarge the surface area of the microorganism layer, and provide an environment capable of firmly attaching the microorganism to the filter and easily propagating the microorganism on the surface of the filter, thereby the bio-layer is not easily separated from the filter, and a new bio-layer is quickly re-formed on the filter even though the bio-layer is separated from the filter due to an turbulent flow occurring in providing oxygen or air into the wastewater using an aeration device, a collision of the filter particles with each other and of the filter with the reaction bath, and the familiaence of the bio-layer.
  • the filter of the present invention may have various colors, if necessary.
  • the color of the filter according to the present invention depends on an application field of the filter, the reaction conditions, and the taste of the user. For example, when the filter is used in a fish globe or an aquarium, filters with different colors may be mixed to improve an aesthetic value.
  • the filter may have the advantage of being easy to control since the state and the exchange period of the filter may be easily monitored by observing color change of the filter with the naked eyes.
  • the filter according to the present invention may act as a fluidized-phase filter and a fixed-phase filter, thus avoiding a disadvantage related to a density required in a conventional fluidized-phase bio-layer filter. Additionally, the size of the filter according to the present invention is not limited, and may be differently selected in accordance with a size of the reaction bath and wastewater treatment conditions.
  • the filter of the present invention When the filter of the present invention is put in the reaction bath of a wastewater treatment device and is used as the fluidized-phase filter to treat the wastewater, the filter moves along with the flow of water circulated by air aerated by an aeration device installed on the bottom of the reaction bath to be uniformly dispersed in the reaction bath to efficiently remove the organics contained in the wastewater in the reaction bath.
  • the filter of the present invention may be put into the reaction bath without the aeration device and an agitator, and may be used as the fixed-phase filter to treat the wastewater.
  • a predetermined amount of the filter is put into the reaction bath with an inlet and outlet for the wastewater.
  • the wastewater is fed into the reaction bath, and passes through the filter put in the reaction bath to purify the wastewater.
  • the purified water is discharged through the outlet of the reaction bath, post-treated, or recycled.
  • the filter according to the present invention forms a spiral, and has a plurality of S-shaped portions. In this regard, a plurality of prominences and depressions are formed on the S-shaped portions. Accordingly, a physical contact surface between the wastewater and the filter and a specific surface area corresponding to a portion of the filter on which the bio-layer containing the microorganism is formed are very large. Additionally, the filter includes various sizes of gaps and holes, and the wastewater is physically filtered as it passes through the various gaps and holes. Filtered and suspended substances contained in the wastewater are not accumulated on some specific portions of the filter due to the structural characteristics of the filter.
  • a turbulent flow occurs to separate the suspended substances from the wastewater due to a specific gravity difference between the suspended substances and the water.
  • the suspended substances remain on a portion of the filter in which a water flow is stopped.
  • the turbulent flow and the flow speed of the wastewater depend on the height and width of the prominences and depressions formed on the filter, thus aerobic and anaerobic microorganisms are efficiently attached to the filter in accordance with the flow of the water to produce the bio-layer on the filter, thereby efficiently decomposing the contaminants contained in the wastewater.
  • the filter of the present invention has an excellent physical filtering ability, and can be applied to biological wastewater treatment technology.
  • the filter of the present invention may be applied to remove the organics contained in the wastewater through an aerobic reaction, remove the organics contained in concentrated organic sewage using an anaerobic reaction, remove ammonium by nitrites and nitrates using the aerobic reaction (nitration), remove nitrogen by reducing nitrites and nitrates into nitrogen gas through the anaerobic reaction, and remove phosphorus through the aerobic/anaerobic reaction.
  • the filter of the present invention has high wastewater treatment efficiency per unit volume to downsize HIQ wastewater treatment device and the reaction bath, thereby reducing their installation cost and area. Further, the filter can efficiently cope with a flow change and a load change.
  • the filter of the present invention can be easily separated from the reaction bath in comparison with a conventional fixed-phase process or a conventional wastewater treatment process using sand and gravel. Thus, it is easy to clean, inspect, and maintain the reaction bath and an aeration system.
  • the filter of the present invention is prevented from being clogged because of its spiral structure, and a turbulent flow is generated in the wastewater due to the spiral structure and the prominences and depressions of the filter of the present invention to form air bubbles in the wastewater to increase a dissolved oxygen (DO) value of the wastewater and provide an appropriate environment to efficiently form aerobic bacteria on the filter.
  • DO dissolved oxygen
  • the filter of the present invention has many prominences and depressions in comparison with a conventional filter.
  • the microorganism is quickly and firmly attached to the filter, thereby the diverence of the bio-layer is prevented, and the separation of the bio-layer from the filter due to frictional resistance between the filter and the wastewater and the shear stress of the wastewater is rare.
  • the filter of the present invention is competitive in terms of wastewater-treatment time and cost in comparison with the conventional filter.
  • the present invention is advantageous in that when the filter of the present invention is used in a wastewater treatment device, minimal space and cost are needed to treat the wastewater, the device using the filter of the present invention is semipermanently used and easily operated, and BOD, COD, and concentrations of nitrogen, phosphorus, and suspended substances in the wastewater are greatly reduced, thereby efficiently securing highly purified water.
  • the workpiece (W) made of a nonferrous metal, such as copper or aluminum, may be cut using the device according to the present invention to produce the spiral filter.
  • the spiral filter thusly produced can be used to adsorb dust or sulfurous acid gas contained in atmospheric air to filter the contaminated air.
  • the present invention provides a spiral filter, which has a relatively large surface area, and which is applied to a contact oxidation process of decomposing organic contaminants contained in wastewater, in addition to filtering dust and contaminated gases contained in atmospheric air, and a method and a device for producing the same.
  • a spiral filter which has a relatively large surface area, and which is applied to a contact oxidation process of decomposing organic contaminants contained in wastewater, in addition to filtering dust and contaminated gases contained in atmospheric air, and a method and a device for producing the same.
  • microorganisms contained in the wastewater are easily and firmly attached to the surface of the spiral filter, a bio-layer is scarcely separated from the surface of the spiral filter, and attachment of the bio-layer to the surface of the spiral filter is maintained for a relatively long term.

Abstract

The objective of this invention is to provide a spiral filter, on a surface of which a plurality of prominences and depressions are alternatively formed at regular intervals, like ribs of a folding fan, and a method and a device for producing the same using a bite (25), reciprocating by converting a high-speed rotating motion into a high-speed reciprocating motion. The spiral filter has a relatively large surface area, and is applied to a contact oxidation process of decomposing organic contaminants contained in wastewater, in addition to filtering dust and contaminated gases contained in atmospheric air. At this time, microorganisms contained in the wastewater are easily and firmly attached to the surface of the spiral filter, a bio-layer is scarcely separated from the surface of the spiral filter, and attachment of the bio-layer to the surface of the spiral filter is maintained for a relatively long term.

Description

A FILTER IN A SPIRAL TYPE FORMING A PLURALITY OF PROMINENCE
AND DEPRESSION IN THE FORM OF THE RIB OF A FAN IN TURN ON SURFACE AND MANUFACTURING METHOD AND MACHINE THEREFOR
Technical Field
The present invention pertains, in general, to a spiral filter, on a surface of which a plurality of prominences and depressions are alternatively formed at regular intervals like ribs of a folding fan, and a method and a device for producing the same. More particularly, the present invention relates to a spiral filter, on a surface of which a plurality of prominences and depressions are alternatively formed at regular intervals like ribs of a folding fan, and a method and a device for producing the same using a bite, reciprocating by converting a high-speed rotating motion into a high-speed reciprocating motion.
Background Art
Obvious to those skilled in the art, various processes are used to treat wastewater depending on its quality. Examples of wastewater treatment processes include chemical treatment processes, a gas treatment process using ozone or chlorine gas, a neutralization process, and an agglomeration process, biological treatment processes such as a process using a bio-layer, a catalytic oxidation process, an activated sludge process, a special biological treatment, an anaerobic treatment process, physical treatment processes such as sedimentation, a filtration, an adsorption, a floating, a membrane treatment process, and a mixture of processes thereof. Additionally, a sand or a carbon filter, a reverse osmotic membrane, a ultrafiltration membrane, and an ion- exchange membrane widely are used in a physicochemical treatment process, and plastics, activated carbons, bio-ceramics, clays, sands, and gravels are usually used in a treatment process using a filter. However, the above processes have disadvantages including high treatment costs, poor attachment of organics and microorganisms to the filter, the filter having a relatively small surface area and also poor durability. In other words, the pores and grooves of the filter are frequently clogged, the filter must be frequently replaced with a new one, it is difficult to install the filter when treating the wastewater, and the increase in the surface area of the filter is limited. Recently, the demand to develop various biological wastewater treatment processes using a microorganism have grown because of water pollution. Biological treatment processes using the microorganism are advantageous in that the water is purified without using chemicals so as to minimize further water pollution due to the chemicals that purify the water. Thus, its application fields are growing. In this regard, the core technology of the biological treatment process depends on the development of a filter which contains a microorganism to react with wastewater.
The above biological treatment processes are mainly used to purify sewage, and can be widely used in fishfarms and aquariums, purify water used in hydroponics, and to purify drinking water. Examples of the biological treatment processes include a honeycomb process and a process using a rotating biological contactor. In addition, biological treatment processes are usually used to reduce the content of organics in wastewater, but are currently applied to remove ammonium (nitration), nitrogen due to denitrification, and phosphorus.
Furthermore, biological treatment processes may be classified as an aerobic wastewater treatment process or as an anaerobic wastewater treatment process. In the case of it being an aerobic wastewater treatment process, the microorganism requires oxygen. On the other hand, in the case of it being an anaerobic wastewater treatment process, the microorganism should be used under an oxygen-free environment.
The aerobic wastewater treatment process has advantages in that the treatment time for purifying the wastewater is short, the organics are almost completely removed, and the equipment used in the aerobic wastewater treatment process occupies a relatively small area in comparison with the anaerobic wastewater treatment process. Further, examples of widely used aerobic wastewater treatment process include an activated sludge process, a rotating biological contactor process, and a bio-layer process such as a sprinkling filter process.
Most devices used in the biological wastewater treatment processes are based on the aerobic process, but an effort to remove nitrogen in concentrated organic industrial wastewater using the anaerobic process is being monitored with keen interest. The activated sludge process widely used in the art has disadvantages such as a large volume of reaction bath, additional process for transporting the sludge, poor sensitivity to a load change, and a swelling phenomenon of the sludge even though it has an advantage of high wastewater treatment efficiency. The rotating biological contactor is advantageous in that the retention time of the reaction bath is short, it is not necessary to transport the water and the sludge, the rotating biological contactor can be applied to wastewater in which the quality of water is greatly changed, less energy is used compared to the activated sludge process, and the devices in the biological contactor operate easily. However, the rotating biological contactor emits a bad odor and operates difficultly during cold weather.
Additionally, the sprinkling filter process in which wastewater is sprayed into a filter made of stones or plastic in a tank has some advantages and disadvantages. In other words, construction and maintenance costs of devices used in the sprinkling filter process are low, the wastewater is aerated without power, the sprinkling filter process is less vulnerable to the quality and amount of wastewater, and a great number of microorganisms exist in the filter. Therefore, it is not necessary to transport the sludge, as it is less influenced by temperamental changes, thus the swelling of the sludge does not occur, and it is easy to operate the devices. , However, when the concentration of the wastewater is high or the pH value of the wastewater is low, fungi dominantly thrive on the filter and cause various problems such as a thick a bio-layer, sloughing of the bio-layer, clogging of the filter layer, and bad odor. Accordingly, attention has been focused on developing and improving various bio-layer filters such as a microorganism adsorption filter so as to avoid the above disadvantages of the wastewater treatment processes.
The bio-layer filter used to biologically purify wastewater is produced by attaching microorganisms to a filter and propagating the microorganism on a surface of the filter, and is used in a contact oxidation process which decomposes organic contaminants contained in the wastewater. When comparing the contact oxidation process with other processes, it is noted to be more advantageous in that the amount of sludge generated in the process is small, process for the transportation of the sludge can be omitted, the equipment used in the contact oxidation process occupies a relatively small area, and the contact oxidation process is easily responds to a load change.
Therefore, the use of the contact oxidation process is increasingly used due to its various advantages.
The bio-layer filter is classified into a fixed-phase bio-layer filter and a fluidized-phase bio-layer filter. In this regard, the fixed-phase bio-layer filter is disadvantageous in that its installation cost is high, it takes a long time to install the fixed-phase bio-layer filter, the fixed-phase bio-layer filter may hinder the mending of an aeration device, and it is difficult to additionally install more fixed-phase bio-layer filters. On the other hand, the fluidized-phase bio-layer filter has advantages in that it is easy to install the fluidized-phase bio-layer filter because the filter is packed in a reaction bath without additional devices, and the amount of the filter packed in the reaction bath is easily controlled because it is easy to additionally pack the filter in the reaction bath or remove the filter from the reaction bath. Accordingly, the use of the fluidized-phase bio-layer filter is on an increasing trend.
A conventional carrier, made of a synthetic resin material, used to filter suspended and alien substances contained in a liquid is disclosed in Japanese Pat. Laid-
Open Publication No. Hei. 7-75712, which is produced by continuously bending the upper end part of a folding fan-shaped board into a shape of a letter S and subsequently repeatedly coiling the resulting board to form a spiral body in which the lower end part of the board is positioned at the central axis of the spiral body. In this respect, the spiral carrier is produced by cutting the rotating synthetic resin material clamped with a chuck of a lathe using a reciprocating bite. However, because the conventional spiral carrier has a smooth surface, the attachment of bacteria to the surface of the conventional carrier is insufficiently maintained and bacteria thus easily separates from the carrier during a back washing process. Furthermore, Korean Utility Model Registration Publication No. 20-0209344 discloses a conventional carrier with a wrinkled surface, instead of a smooth surface, to ensure a relatively enlarged surface area.
Like the conventional carrier with the wrinkled surface disclosed in Korean Utility Model Laid-Open Publication No. 20-0209344, Japanese Pat. Laid-Open Publication No. Hei. 7-275876 recites a bacteria culture filter, which has a surface wrinkled by moving a bite to cut a synthetic resin material clamped with a chuck of a lathe while controlling the rotation speed of the chuck and the movement speed of the bite. When the synthetic resin material is cut, the surface of the synthetic resin material is cracked to form a plurality of grooves at irregular intervals on the surface of the synthetic resin material, thereby the bacteria culture filter has a wrinkled surface. At this time, lengths and shapes of the grooves are different from each other. However, the bacteria culture filter has a disadvantage in that the attachment of bacteria to the surface of the filter is insufficiently maintained and bacteria is easily separated from the bacteria culture filter during a back washing process. Even though more bacteria is attached to the wrinkled surface of the bacteria culture filter than in the case of the filter having the smooth surface after the backwashing process, the bacterium are easily separated from the bacteria culture filter during the backwashing process because of the irregular shapes of the wrinkles, the irregular intervals between the wrinkles, and shallow depths of the grooves. Accordingly, wastewater is insufficiently purified in the case of using the above bacteria culture filter.
The use of the conventional carriers as described above is undesirable and is limited to a contact oxidation process which decomposes organic contaminants contained in the wastewater. It also cannot be adjusted to filter dust and contaminated gases contained in atmospheric air.
Disclosure of the Invention
Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior arts, and an objective of the present invention is to provide a sphal filter, which has a relatively large surface area, and which is applied to a contact oxidation process of decomposing organic contaminants contained in wastewater, in addition to filtering dust and contaminated gases contained in atmospheric air, and a method and a device for producing the same. At this time, microorganisms contained in the wastewater are easily and firmly attached to the surface of the spiral filter, a bio-layer is scarcely separated from the surface of the spiral filter, and an attachment of the bio- layer to the surface of the spiral filter is maintained for a relatively long term.
Brief Description of the Drawings
The above, other objects, other features and other advantages of the present invention will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings, in which:
FIG. 1 is a perspective view of a device for producing a spiral filter, on a surface of which a plurality of prominences and depressions are alternately formed at regular intervals like ribs of a folding fan, according to the present invention;
FIG. 2 is a partially enlarged view of the device of FIG. 1, which shows the conversion of rotation motions of driving and slave pulleys into a reciprocating motion; FIG. 3 illustrates an eccentric rotation locus of an eccentric cam around the center of the slave pulley; FIG. 4 illustrates workpieces clamped with chucks of FIG. 1 ;
FIG. 5 illustrates a filter according to the present invention; FIG. 6 illustrates an interior section of the filter according to the present invention; and
FIG. 7 is a plan view of the filter according to the present invention. Best Mode for Carrying Out the Invention
Reference should now be made to the drawings, in which the same reference numerals are used throughout the different drawings to designate the same or similar components.
In order to accomplish the above object, the present invention provides a method of producing' a spiral filter, on a surface of which a plurality of prominences and depressions are alternatively formed at regular intervals, like ribs of a folding fan. The method includes rotating the workpiece while the first end of the workpiece is clamped with a chuck and the second end of the workpiece is supported by a plurality of rotation guide rollers to guide the rotation of the workpiece; rotating the first driving pulley using the first motor to bring about the rotation of the first driving belt, leading to the rotation of the first slave pulley; converting the rotating motion of the first slave pulley into a reciprocating motion of a link body through an eccentric cam; cutting the rotating workpiece using a reciprocating bite connected to the link body; and controlling movement of the bite in accordance with a length change in the workpiece due to it.
At this time, the controlling movement of the bite is performed in such a way that the second driving pulley, the second driving belt, and the second slave pulley are rotated by the second motor to initiate the rotation of a lead screw to move the main body, leading to sήnultaneous movement of a supporting plate, a supporting member, the first driving pulley, the first slave pulley, the eccentric cam, and the link body, connected to the main body, thereby moving the bite.
In order to accomplish the above object, the present invention provides a device for producing a spiral filter, on a surface of which a plurality of prominences and depressions are alternatively formed at regular intervals, like ribs of a folding fan. The device includes a chuck rotating by the third motor while clamping to the first end of a workpiece. A plurality of rotation guide rollers are in contact with an external surface of a second end of the workpiece, which is clamped at the first end with the chuck, to guide rotation of the workpiece. Additionally, the first driving pulley rotates by the first motor, and the first slave pulley rotates by rotation of the first driving belt due to rotation of the first driving pulley. Further, an eccentric cam converts the rotating motion of the first slave pulley into a reciprocating motion, and a link body reciprocates by converting the rotation motion of the first slave pulley into the reciprocating motion using the eccentric cam. Furthermore, a supporting guide guides the reciprocating motion of the link body while supporting the link body. A bite is connected to the link body and reciprocates to cut the rotating workpiece. The main body is united with the supporting guide through a supporting plate to be moved in accordance with a length change in the workpiece due to cutting it. In this regard, the workpiece rotating by the chuck is cut using the reciprocating bite, thereby producing the spiral filter. The eccentric cam is eccentrically connected to the first slave pulley in such a way that a center of the first end of the eccentric cam is spaced from a center of the first slave pulley, and that the second end of the eccentric cam is connected to the link body through a rotation link.
Furthermore, the bite has an edge with an arched line, and cuts the workpiece while being in contact with a radius line of an end surface of the second end of the workpiece.
Moreover, the device further includes the second motor, the second driving pulley rotating by the second motor, the second slave pulley, the second driving belt to connect the second driving and slave pulleys, and a lead screw connected to the second slave pulley so as to move the main body. In addition, the workpiece is shaped like a rod, and the sectional shape of the workpiece is a circle or a polygon.
Further, the workpiece is made of a synthetic resin or a nonferrous metal.
In order to accomplish the above objective, the present invention provides a filter produced according to the method of claim 1, in which the workpiece constituting the filter is continuously bent in an S-shape to form S-shaped portions. The S-shaped portions each have a tapered structure like a folding fan. The workpiece having the S-shaped portions is coiled numerous times to form a spiral body, and a plurality of prominences and depressions are alternatively formed at regular intervals, like ribs of the folding fan, on the surface of the workpiece.
In this regard, upper end portions of the S-shaped portions of the workpiece are angulated at regular intervals by the prominences and depressions alternatively formed at regular intervals on the surface of the filter.
Additionally, the workpiece is shaped like a rod, and a sectional shape of the workpiece is a circle or a polygon.
In addition, the workpiece is made of a synthetic resin or a non-ferrous metal.
Meanwhile, the word "filter" is generally used to refer to a bio-layer carrier used in a contact oxidation process in which microorganisms are attached to the filter and propagated on the surface of the filter to decompose organic contaminants contained in the wastewater, and a filtering substance, having a similar shape to the bio-layer carrier, used to adsorb dust and sulfurous acid gas present in atmospheric air to filter the contaminated air unlike the bio-layer carrier.
Hereinafter, a detailed description will be given of the present invention, referring to the drawings. As described above, the device for producing the filter according to the present invention, includes chucks 13 rotating while clamping workpieces, a plurality of rotation guide rollers 26, a first driving pulley 22 and a first slave pulley 22' rotating by a first motor 20, an eccentric cam 19, a link body 29 reciprocating by use of the eccentric cam 19 to convert a rotating motion of the first slave pulley 22' into a reciprocating motion, a supporting guide 24 to guide the reciprocating motion of the link body 29 while supporting it, bites 25 connected to the link body 29 to cut the rotating workpieces (W) while reciprocating, and a main body 33 united with the supporting guide 24 by a supporting plate 27 to be moved in accordance with a length change in the workpieces (W) due to cutting it.
At this time, it is preferable to use a cylindrical rod made of a synthetic resin as the workpieces (W) for the spiral filter according to the present invention. In the present invention, the kind and shape of the workpieces (W) are not limited. For example, the workpieces (W) may be composed of non-ferrous metal, such as copper or aluminum. Additionally, each of the workpieces (W) may be shaped like a rod with its sectional shape being a polygon, such as a triangle, a tetragon, a pentagon, or a hexagon. The workpieces (W) are clamped with the chucks 13 at first ends thereof, and second ends of the workpieces (W) are put between the rotation guide rollers 26 while being inserted through holes 18, 18', thereby, rotation of the workpieces (W) by the chucks 13 are guided by the rotation guide rollers 26.
With reference to FIG. 1, the chucks 13 have the same shape as a typical chuck of a lathe, and function to clamp the workpieces (W). Additionally, the rotating force of the second motor 12 is transferred through the driving belt to pulleys 11, 11', and the chucks 13 rotate while clamping the workpieces (W) by rotation of the pulleys 11, 11'. In FIG. 1, one motor and two pulleys have been illustrated and are used to turn the chucks 13. However, one or more motors and one or more pulleys may be used to turn the chucks 13, if necessary. When a plurality of pulleys are installed in the device to turn the chucks 13, the numbers of the chucks 12, bites 25, link body 29, eccentric cam 19, first driving pulley 22, and first slave pulley 22' are increased in accordance with the number of the pulleys used to turn the chucks 13, thereby the productivity per unit time of the spiral filter is improved.
A plurality of rotation guide rollers 26 may be installed in the device to guide the rotation of the workpieces (W) while supporting them(W). At this time, it is preferable to install three rotation guide rollers 26 in the device. In other words, it is preferable for the workpieces (W) to rotate while being put between the three rotation of the guide rollers 26 to be guided and supported by the rotation guide rollers 26.
The first driving pulley 22 rotates by the turning force of the first motor 20, leading to the rotation of the first driving belt 40 to turn the first slave pulley 22'. The first slave pulley 22' is supported by a supporting member 21, and the first motor 20 is connected through a separate supporter and supporting legs to a lower side of the supporting plate 27 as shown in FIGS. 1 and 2.
Referring to FIG. 3, the eccentric cam 19 is eccentrically connected to the first slave pulley 22' in such a way that the center (O') of a first end of the eccentric cam 19 is spaced from the center (O) of the first slave pulley 22'. Further, a second end of the eccentric cam 19 has an opening, and is connected to the link body 29 by a rotation link
23 rotating while being inserted through the opening of the second end of the eccentric cam 19. Accordingly, as shown in FIG. 3, when the first slave pulley 22' rotates, the first end of the eccentric cam 19 eccentrically rotates around the center (O) of the first slave pulley 22' with the center (O') of the first end of the eccentric cam 19 being spaced from the center (O) of the first slave pulley 22'. At this time, a body of the eccentric cam 19 is reciprocated while being swung at a predetermined angle, and the rotation motion of the eccentric cam 19 is transmitted to the rotation link 23 to reciprocate the link body 29.
As described above, the rotating motion of the first slave pulley 22' is converted into a reciprocating motion by the eccentric cam 19, thereby reciprocating the link body
29. Furthermore, the bites 25 connected to the link body 29 reciprocate to cut the rotating workpieces (W).
The supporting guide 24 is connected to a lower side of the supporting plate 27 at an upper part thereof, which supports the link body 29, and guides the reciprocating motion of the link body 29. In addition, the supporting plate 27 slides along mobile sliders 28 connected to both sides of the frame of the device by two sliding protrusions formed on the supporting plate 27 and engaged with the mobile sliders 28, as shown in FIG. 2.
The bites 25 fixed to the link body 29 reciprocate to cut the rotating workpieces (W). It is preferable that the edges of the bites 25 are of a circular shape, but is not limited to the circular shape. In other words, the edges of the bites 25 may form various outlines, such as an oval line, a semi-circular line, an arched line with a predetermined angle, or a straight line.
The main body 33 is united with the supporting guide 24 through the supporting plate 27, and is screwed over the lead screw 14 so as to be moved along the lead screw
14. In detail, the second motor 17 rotates to bring about the rotation of the driving pulley 16, the driving belt, the slave pulley 15, and lead screw 14, leading to the movement of the main body 33. With respect to this, the present invention is not limited to the movement of the main body 33 along the lead screw 14. That is to say, the movement of the main body 33 may be conducted in other manners, such as a rolling manner using a roller, or in a sliding manner.
When the main body 33 is moved along the lead screw 14, the supporting plate 27, the supporting member 21, the first driving and slave pulleys 22, 22', the eccentric cam 19, the link body 29, and the bites 25 connected to the main body 33 are simultaneously moved in conjunction with the main body 33.
Meanwhile, as shown in FIG. 1, a control box 30 is installed at a lateral side of the device for producing the spiral filter to independently control the rotation directions and the speeds of the motors 12, 17, 20. The rotation speed of the first and third motors 20, 12 must be relatively fast because it is economic to produce a lot of filters within a unit time in a view of the productivity of the spiral filter. Additionally, it is preferable that the rotating speeds of the first and third motors 20, 12 be about 1750 and 8000 rpm, respectively, assuming that diameters of the driving and slave pulleys are about 135 and 60 mm, respectively. When the rotation speed of the chucks 13 is fast, compared to the reciprocating speed of the bites 25, that is to say, when the rotating speed of the third motor 12 is faster than that of the first motor 20, intervals between grooves or valleys formed on the surfaces of the workpieces (W) are widened during the cutting process of the workpieces (W), and vice versa. Hence, the rotating speeds of the first to third motors 20, 17, 12 must be properly controlled. Hereinafter, a detailed description will be given describing the operation of the device for producing the spiral filter, on a surface of which a plurality of prominences and depressions are alternatively formed at regular intervals like ribs of a folding fan, according to the present invention.
After the device is turned on, a worker must check whether the workpieces (W) are clamped with the chucks 13 or not. In the case that the workpieces (W) are not clamped with the chucks 13, the worker situates the workpieces (W) in the device in such a way that the first end of the workpieces (W) are stuck into the chucks 13 and the second end of the workpieces (W) are put between a plurality of rollers 26 while being inserted through the hole 18, 18'. The control box 30 is then operated to enable the chucks 13 to clamp the first ends of the workpieces (W). Subsequently, the rotating directions and speeds of the first to third motors 20,17,12 are controlled by the control box 30. The first motor 20 is operated to bring about rotation of the first driving pulley 22, leading to rotation of the first driving belt 40. Furthermore, the first slave pulley 22' rotates by the first driving belt 40. Thereafter, the eccentric cam 19 connected to the first slave pulley 22' eccentrically rotates around the center of the first slave pulley 22' to convert the rotating motion of the first slave pulley 22' into the reciprocating motion of the link body 29. At this time, the link body 29 is not vertically moved, but horizontally reciprocates in the supporting guide 24. Accordingly, the reciprocating motion of the link body 29 initiates the reciprocating motion of the bites 25, having the circular section, connected to the link body 29. The reciprocating bites 25 cut the workpieces (W) while being in contact with radius lines of end surfaces of the second ends of the workpieces (W), clamped with the chucks 13 and rotating by the third motor 12. In this respect, it is feasible to continuously produce the spiral filter, on the surface of which a plurality of prominences and depressions are alternatively formed at regular intervals like ribs of a folding fan, because the bites 25 reciprocate during the cutting process of the workpieces
(W).
As a consequence, the filter produced can be made of a synthetic resin such as vinyl chloride, polypropylene, and poly ehtylene, or a wasted resin thereof. Accordingly, even though filter particles are rotated in a reaction bath or collide with each other, and the filter particles collide with an inner wall of the reaction bath, the filter is not easily abraded. That is to say, the filter according to the present invention has excellent mechanical strength and durability, can be semi-permanently used, and is economical because the filter is easily obtained. Further, the size of the present invention's filter is not limited, and can be adjusted as needed. The filter according to the present invention is of a spiral shape, the workpiece constituting the filter is continuously bent in an S-shape to form the S-shaped portions. The S-shaped portions each have the downwardly tapered structure like a folding fan and the workpiece having the S-shaped portions is coiled numerous times to form a spiral body. Additionally, a plurality of prominences and depressions are alternatively formed at regular intervals, like ribs of the folding fan, on the surface of the workpiece, and upper end portions of the S-shaped portions of the workpiece are angulated at regular intervals by the prominences and depressions alternatively formed at regular intervals on the surface of the filter.
Therefore, the spiral filter according to the present invention has a significantly larger surface area than a conventional filter. In detail, the spiral filter of the present invention has a surface area ten times or more larger than the conventional filter, having the relatively small surface area because intervals between wrinkles and shapes of the wrinkles of the surface of the conventional filter are irregular and shallow depressions are formed on the surface of the conventional filter even though the conventional filter has the wrinkles on the surface thereof. As described above, a plurality of prominences and depressions are formed on the surface of the filter of the present invention to enlarge the surface area of the filter, leading to an enlargement of the contact area between the filter and the wastewater and of the surface area to which microorganisms can be attached. Thereby, wastewater treatment efficiency of the filter according to the present invention is improved. Furthermore, the filter of the present invention has an excellent physical filtration ability and is prevented from clogging due to its special structure.
The prominences and depressions may be formed on any one surface or on both surfaces of the workpiece constituting the filter. It is preferable that the prominences and depressions are formed on both surfaces of the workpiece for the filter.
Additionally, the bio-layer containing the cultured bacteria is formed on both surfaces of the workpiece. To enlarge the surface area of the filter, it is preferable to form the prominences and depressions on the surface of the workpiece as many as possible. However, spaces between the neighboring walls of the prominences and depressions may be clogged because the spaces are very narrow when there are significantly lots of prominences and depressions on the surface of the workpiece. Hence, intervals between the neighboring walls of the prominences and depressions must be properly controlled.
In detail, a whole shape of the filter of the present invention is a spiral. In other words, the workpiece is bent in the S-shape to form the continuous S-shaped portions at an upper part thereof. The S-shaped portions each have the tapered structure and the workpiece having the S-shaped portions is coiled numerous times in such a way that an enlarged portion of the tapered structure is located outside of the filter and a contracted portion of the tapered structure is located at an inside of the filter, thereby forming the spiral body. The spiral filter includes a plurality of S-shaped portions continuously integrated with each other, and is coiled. Additionally, each S-shaped portion may or may not have the same size in accordance with the rotating speeds of the motors 12, 20, 17, radially arranged, and have a plurality of tapered portions by regulating the rotating velocity of motors 12, 17, 20. An outward portion of the tapered portion constituting the filter is relatively large and its inward portion is relatively small. Additionally, the filter including the continuous S-shaped portions coiled in a spiral shape has a plurality of gaps and holes with various sizes formed therethrough.
Importantly, the filter of the present invention has significantly larger surface than the conventional filter because the filter of the present invention has a spiral structure, and the filter of the present invention has ati enlarged surface area because the uneven wrinkles are formed on the surface of the spiral filter made of synthetic resin.
In other words, the increase of the filter's surface area contributes to improving the physical filtration function and enlarging a surface of the bio-layer formed on the surface of the filter to improve a biological treatment efficiency. Additionally, a plurality of prominences and depressions are formed on the surfaces of the S-shaped portions as a way to extend from a large portion to a small portion to guide contaminants contained in the wastewater from the large portion to the small portion, thereby aiding the attachment of the contaminants contained in the wastewater to the filter. The prominences and depressions function to greatly enlarge the surface area of the microorganism layer, and provide an environment capable of firmly attaching the microorganism to the filter and easily propagating the microorganism on the surface of the filter, thereby the bio-layer is not easily separated from the filter, and a new bio-layer is quickly re-formed on the filter even though the bio-layer is separated from the filter due to an turbulent flow occurring in providing oxygen or air into the wastewater using an aeration device, a collision of the filter particles with each other and of the filter with the reaction bath, and the corpulence of the bio-layer.
Moreover, the filter of the present invention may have various colors, if necessary. The color of the filter according to the present invention depends on an application field of the filter, the reaction conditions, and the taste of the user. For example, when the filter is used in a fish globe or an aquarium, filters with different colors may be mixed to improve an aesthetic value. Additionally, the filter may have the advantage of being easy to control since the state and the exchange period of the filter may be easily monitored by observing color change of the filter with the naked eyes.
The filter according to the present invention may act as a fluidized-phase filter and a fixed-phase filter, thus avoiding a disadvantage related to a density required in a conventional fluidized-phase bio-layer filter. Additionally, the size of the filter according to the present invention is not limited, and may be differently selected in accordance with a size of the reaction bath and wastewater treatment conditions.
When the filter of the present invention is put in the reaction bath of a wastewater treatment device and is used as the fluidized-phase filter to treat the wastewater, the filter moves along with the flow of water circulated by air aerated by an aeration device installed on the bottom of the reaction bath to be uniformly dispersed in the reaction bath to efficiently remove the organics contained in the wastewater in the reaction bath. In addition, the filter of the present invention may be put into the reaction bath without the aeration device and an agitator, and may be used as the fixed-phase filter to treat the wastewater. In the case of using the filter as the fixed-phase filter, a predetermined amount of the filter is put into the reaction bath with an inlet and outlet for the wastewater. The wastewater is fed into the reaction bath, and passes through the filter put in the reaction bath to purify the wastewater. The purified water is discharged through the outlet of the reaction bath, post-treated, or recycled.
Hereinafter, a detailed description for a mechanism of purifying the wastewater using the filter of the present invention and advantages of the filter will be given. The filter according to the present invention forms a spiral, and has a plurality of S-shaped portions. In this regard, a plurality of prominences and depressions are formed on the S-shaped portions. Accordingly, a physical contact surface between the wastewater and the filter and a specific surface area corresponding to a portion of the filter on which the bio-layer containing the microorganism is formed are very large. Additionally, the filter includes various sizes of gaps and holes, and the wastewater is physically filtered as it passes through the various gaps and holes. Filtered and suspended substances contained in the wastewater are not accumulated on some specific portions of the filter due to the structural characteristics of the filter. When the wastewater passes through the filter, a turbulent flow occurs to separate the suspended substances from the wastewater due to a specific gravity difference between the suspended substances and the water. The suspended substances remain on a portion of the filter in which a water flow is stopped. Furthermore, the turbulent flow and the flow speed of the wastewater depend on the height and width of the prominences and depressions formed on the filter, thus aerobic and anaerobic microorganisms are efficiently attached to the filter in accordance with the flow of the water to produce the bio-layer on the filter, thereby efficiently decomposing the contaminants contained in the wastewater.
Therefore, the filter of the present invention has an excellent physical filtering ability, and can be applied to biological wastewater treatment technology. For example, the filter of the present invention may be applied to remove the organics contained in the wastewater through an aerobic reaction, remove the organics contained in concentrated organic sewage using an anaerobic reaction, remove ammonium by nitrites and nitrates using the aerobic reaction (nitration), remove nitrogen by reducing nitrites and nitrates into nitrogen gas through the anaerobic reaction, and remove phosphorus through the aerobic/anaerobic reaction.
The filter of the present invention has high wastewater treatment efficiency per unit volume to downsize HIQ wastewater treatment device and the reaction bath, thereby reducing their installation cost and area. Further, the filter can efficiently cope with a flow change and a load change.
Furthermore, the filter of the present invention can be easily separated from the reaction bath in comparison with a conventional fixed-phase process or a conventional wastewater treatment process using sand and gravel. Thus, it is easy to clean, inspect, and maintain the reaction bath and an aeration system.
Further, the filter of the present invention is prevented from being clogged because of its spiral structure, and a turbulent flow is generated in the wastewater due to the spiral structure and the prominences and depressions of the filter of the present invention to form air bubbles in the wastewater to increase a dissolved oxygen (DO) value of the wastewater and provide an appropriate environment to efficiently form aerobic bacteria on the filter.
Additionally, the filter of the present invention has many prominences and depressions in comparison with a conventional filter. Thus, the microorganism is quickly and firmly attached to the filter, thereby the corpulence of the bio-layer is prevented, and the separation of the bio-layer from the filter due to frictional resistance between the filter and the wastewater and the shear stress of the wastewater is rare. Additionally, even though a portion of the bio-layer is separated from the filter, it takes a short time to attach the microorganism layer to the filter because a remaining portion of the bio-layer exists on the filter, thus the filter of the present invention is competitive in terms of wastewater-treatment time and cost in comparison with the conventional filter.
Therefore, the present invention is advantageous in that when the filter of the present invention is used in a wastewater treatment device, minimal space and cost are needed to treat the wastewater, the device using the filter of the present invention is semipermanently used and easily operated, and BOD, COD, and concentrations of nitrogen, phosphorus, and suspended substances in the wastewater are greatly reduced, thereby efficiently securing highly purified water.
In addition, the workpiece (W) made of a nonferrous metal, such as copper or aluminum, may be cut using the device according to the present invention to produce the spiral filter. At this time, the spiral filter thusly produced can be used to adsorb dust or sulfurous acid gas contained in atmospheric air to filter the contaminated air.
The present invention has been described in an illustrative manner, and it is to be understood that the terminology used is intended to be in the nature of description rather than of limitation. Many modifications and variations of the present invention are possible in light of the above teachings. Therefore, it is to be understood that within the scope of the appended claims, the invention may be practiced otherwise than as specifically described.
Industrial Applicability
As described above, the present invention provides a spiral filter, which has a relatively large surface area, and which is applied to a contact oxidation process of decomposing organic contaminants contained in wastewater, in addition to filtering dust and contaminated gases contained in atmospheric air, and a method and a device for producing the same. At this time, microorganisms contained in the wastewater are easily and firmly attached to the surface of the spiral filter, a bio-layer is scarcely separated from the surface of the spiral filter, and attachment of the bio-layer to the surface of the spiral filter is maintained for a relatively long term.

Claims

Claims
1. A method of producing a spiral filter, on a surface of which a plurality of prominences and depressions are alternatively formed at regular intervals, like ribs of a folding fan, comprising: rotating the workpiece while the first end of the workpiece is clamped with a chuck and the second end of the workpiece is supported by a plurality of rotation guide rollers to guide rotation of the workpiece; rotating the first driving pulley using the first motor to bring about the rotation of the first driving belt, leading to the rotation of the first slave pulley; converting the rotating motion of the first slave pulley into a reciprocating motion of a link body through an eccentric cam; cutting the rotating workpiece using a reciprocating bite connected to the link body; and controlling the movement of the bite in accordance with a length change in the workpiece due to cutting it.
2. The method as set forth in claim 1, wherein the controlling movement of the bite is performed in such a way that the second driving pulley, the second driving belt, and the second slave pulley are rotated by the second motor to initiate rotation of the lead screw to move the main body, leading to simultaneous movement of a supporting plate, a supporting member, the first driving pulley, the first slave pulley, the eccentric cam, and the link body, connected to the main body, thereby moving the bite.
3. A device for producing a spiral filter, on a surface of which a plurality of prominences and depressions are alternatively formed at regular intervals, like ribs of a folding fan, comprising: a chuck rotating by the third motor while clamping the first end of the workpiece; a plurality of rotation guide rollers being in contact with an external surface of the second end of the workpiece, which is clamped at the first end with the chuck, to guide the rotation of the workpiece; the first driving pulley rotating by the first motor; the first slave pulley rotating by the rotation of the first driving belt due to the rotation of the first driving pulley; an eccentric cam to convert the rotating motion of the first slave pulley into a reciprocating motion; a link body reciprocating by converting the rotating motion of the first slave pulley into the reciprocating motion using the eccentric cam; a supporting guide to guide the reciprocating motion of the link body while supporting the link body; a bite connected to the link body and reciprocating to cut the rotating workpiece; and a main body united with the supporting guide through a supporting plate to be moved in accordance with a length change in the workpiece due to cutting it, wherein the workpiece rotating by the chuck is cut using the reciprocating bite, thereby producmg the spiral filter.
4. The device as set forth in claim 3, wherein the eccentric cam is eccentrically connected to the first slave pulley in such a way that the center of the first end of the eccentric cam is spaced from the center of the first slave pulley, and that the second end of the eccentric cam is connected to the link body through a rotation link.
5. The device as set forth in claim 3, wherein the bite has an edge with an arched line, and cuts the workpiece while being in contact with a radius line of an end surface of the second end of the workpiece.
6. The device as set forth in claim 3, further comprising a third motor, a second driving pulley rotating by the second motor, a second slave pulley, a second driving belt to connect the second driving and slave pulleys, and a lead screw connected to the second slave pulley so as to move the main body.
7. The device as set forth in claim 3, wherein the workpiece is shaped like a rod, and a sectional shape of the workpiece is a circle or a polygon.
8. The device as set forth in claim 3, wherein the workpiece is made of a synthetic resin or a nonferrous metal.
9. A filter produced according to the method of claim 1, in which a workpiece constituting the filter is continuously bent in an S-shape to form S-shaped portions, the S- shaped portions each have a tapered structure like a folding pan, the workpiece having the S-shaped portions is coiled numerous times to form a spiral body, and a plurality of prominences and depressions are alternatively formed at regular intervals, like the ribs of the folding fan on the surface of the workpiece.
10. The filter as set forth in claim 9, wherein upper end portions of the S-shaped portions of the workpiece are angulated at regular intervals by the prominences and depressions alternatively formed at regular intervals on the surface of the filter.
11. The filter as set forth in claim 9, wherein the workpiece is shaped like a rod, and a sectional shape of the workpiece is a circle or a polygon.
12. The filter as set forth in claim 9, wherein the workpiece is made of a synthetic resin or a nonferrous metal.
PCT/KR2004/000304 2003-02-17 2004-02-14 A filter in a spiral type forming a plurality of prominence and depression in the form of the rib of a fan in turn on surface and manufacturing method and machine therefor WO2004071621A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP04711316A EP1644099A4 (en) 2003-02-17 2004-02-14 A filter in a spiral type forming a plurality of prominence and depression in the form of the rib of a fan in turn on surface and manufacturing method and machine therefor

Applications Claiming Priority (6)

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KR10-2003-0009874 2003-02-17
KR20030009874 2003-02-17
KR20030033117 2003-05-23
KR10-2003-0033117 2003-05-23
KR10-2004-0006752 2004-02-02
KR10-2004-0006752A KR100475171B1 (en) 2003-02-17 2004-02-02 A filter in a spiral type forming a plurality of prominence and depression in the form of the rib of a fan in turn on surface and manufacturing method and machine therefor

Publications (1)

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WO2004071621A1 true WO2004071621A1 (en) 2004-08-26

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WO (1) WO2004071621A1 (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07951A (en) * 1993-06-17 1995-01-06 Hiroomi Ichinose Many-petaled fold shaped filter and its manufacturing device
JPH0775712A (en) * 1993-01-22 1995-03-20 Yasuo Fujino Spiral filter medium
JPH07275876A (en) * 1994-04-08 1995-10-24 Tadamasa Ito Bacteria culturing type filter material
KR20020092860A (en) * 2002-10-16 2002-12-12 장량 Wastewater specie processing microorganism contact media's manufactory and product

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU573473B2 (en) * 1986-04-28 1988-06-09 Nippondenso Co. Ltd. Making filters from corrugated webs

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0775712A (en) * 1993-01-22 1995-03-20 Yasuo Fujino Spiral filter medium
JPH07951A (en) * 1993-06-17 1995-01-06 Hiroomi Ichinose Many-petaled fold shaped filter and its manufacturing device
JPH07275876A (en) * 1994-04-08 1995-10-24 Tadamasa Ito Bacteria culturing type filter material
KR20020092860A (en) * 2002-10-16 2002-12-12 장량 Wastewater specie processing microorganism contact media's manufactory and product

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP1644099A4 *

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EP1644099A4 (en) 2009-04-29

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