Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
  • B01D35/00—Filtering devices having features not specifically covered by groups B01D24/00 - B01D33/00, or for applications not specifically covered by groups B01D24/00 - B01D33/00; Auxiliary devices for filtration; Filter housing constructions
  • B01D35/10—Brush filters ; Rotary brush filters
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
  • F16L11/00—Hoses, i.e. flexible pipes
  • F16L11/04—Hoses, i.e. flexible pipes made of rubber or flexible plastics
  • F16L11/11—Hoses, i.e. flexible pipes made of rubber or flexible plastics with corrugated wall
  • F16L11/118—Hoses, i.e. flexible pipes made of rubber or flexible plastics with corrugated wall having arrangements for particular purposes, e.g. electrically conducting
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
  • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
  • B01D29/11—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with bag, cage, hose, tube, sleeve or like filtering elements
  • B01D29/13—Supported filter elements
  • B01D29/15—Supported filter elements arranged for inward flow filtration
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
  • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
  • B01D29/50—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with multiple filtering elements, characterised by their mutual disposition
  • B01D29/52—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with multiple filtering elements, characterised by their mutual disposition in parallel connection
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
  • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
  • B01D29/60—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor integrally combined with devices for controlling the filtration
  • B01D29/605—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor integrally combined with devices for controlling the filtration by level measuring
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
  • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
  • B01D29/62—Regenerating the filter material in the filter
  • B01D29/66—Regenerating the filter material in the filter by flushing, e.g. counter-current air-bumps
  • B01D29/661—Regenerating the filter material in the filter by flushing, e.g. counter-current air-bumps by using gas-bumps
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
  • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
  • B01D29/62—Regenerating the filter material in the filter
  • B01D29/70—Regenerating the filter material in the filter by forces created by movement of the filter element
  • B01D29/72—Regenerating the filter material in the filter by forces created by movement of the filter element involving vibrations
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
  • B01D35/00—Filtering devices having features not specifically covered by groups B01D24/00 - B01D33/00, or for applications not specifically covered by groups B01D24/00 - B01D33/00; Auxiliary devices for filtration; Filter housing constructions
  • B01D35/14—Safety devices specially adapted for filtration; Devices for indicating clogging
  • B01D35/153—Anti-leakage or anti-return valves
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
  • F16L59/00—Thermal insulation in general
  • F16L59/06—Arrangements using an air layer or vacuum
  • F16L59/07—Arrangements using an air layer or vacuum the air layer being enclosed by one or more layers of insulation
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
  • B01D2201/00—Details relating to filtering apparatus
  • B01D2201/08—Regeneration of the filter
  • B01D2201/087—Regeneration of the filter using gas bubbles, e.g. air
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
  • B01D2201/00—Details relating to filtering apparatus
  • B01D2201/18—Filters characterised by the openings or pores
  • B01D2201/184—Special form, dimension of the openings, pores of the filtering elements
  • B01D2201/186—Pore openings which can be modified

Definitions

• the present invention relates to a gravity fiber filter, and more specifically a gravity fiber filter comprising: a filter tank placed in a portion of a large amount of running water; at least one unit filter disposed in the filter tank; a filtered water collecting tank disposed in a lower portion of the filter tank; a discharging pipe extended from the filtered water collecting tank to the height lower than a influent inlet of the filter tank, so that the height of the extended discharging pipe is defined as a height of starting filtration; a sensor; a air inflow pipe through which a backwash air flows in from outside to a lower portion of the filter tank; a control means controlling the operation of filtering and backwashing; and backwash water discharging pipe.
• Generally filtering process means a process in which raw water including suspended solids flows into a filter and filtered water is produced by eliminating suspended solids from the raw water. That is, in the filtering process, the suspended solids in the raw water are captured at pores formed in a filtering layer which is formed of filter media by complicated mechanism such as a screening, a precipitation, an inertial collision, an interception, an absorption, cohesion, etc., and thereby clean water, that is, filtered water, is discharged.
• the filter may be classified into a continuous cross flow gravity filter and a continuous down flow gravity filter or a continuous down flow pressure filter depending on the flow of water.
• the continuous cross flow gravity filter includes an Aqua Disk Filter and a Micro Disk Filter.
• Aqua Disk Filter which is an American type
• the raw water flows into a water tank by gravity and is filtered by using a carpet type filtering cloth.
• the Micro Disk Filter which is a Swedish type
• the raw water passes through a close net connected to a variable low-speed rotary center drum from inside to outside and be filtered.
• the continuous cross flow gravity filter has advantages as follows.
• the filtered water has high quality, the filter doesn't need a large site for installation, and it is easy to repair the filter because the filter is manufactured by the respective unit.
• the continuous cross flow gravity filter has disadvantages as follows. It is difficult to cope with the change of the quality or amount of influent raw water, the filtering efficiency is increased but the amount of filtering capacity is decreased if the number of rotation of the rotary drum is decreased or the frequency of washing a disk is decreased, the filter element is damaged by high pressure while washing each disk so that the life of the filter is decreased, and when repairs or replacement of filter media is performed, the operation of filter needs to be stopped.
• the continuous down flow gravity filter includes a sand media gravity filter in which raw water flows in to the upper part of a filtering layer, passes through the filtering layer downward and then flows out to a collecting basin placed below.
• the said filtering layer comprises mainly sand and the life of the filter media is about 5 years.
• the sand media gravity filter has advantages as follows. Blockade of the filter media due to mud ball, etc. doesn't occur. And the headloss is small so that filtration by natural flow of water is possible.
• the sand media gravity filter has disadvantages as follows.
• the filter needs a large site for installation, large investment is needed, the groth of algae is hastened by the sun light, the amount of the filter media (i.e., sand) is large so that it is difficult to exchange the filter media, and the operation needs to be stopped in order to exchange the filter.
• an object of the present invention is to provide a new type of gravity fiber filter that filters suspended solids in a large amount of continuously flowing water. That is, the object of the present invention is to provide a gravity fiber filter which has the advantages of the said continuous cross flow gravity filter, namely high quality of the filtered water, a small site for installation and easy maintenance, and in which the disadvantages of the said continuous cross flow gravity filter are obviated.
• a gravity fiber filter comprises a filter tank placed in a portion of a large amount of running water, and comprising an influent inlet formed in a side of an upper portion of the filter tank and letting raw water flow in through a check valve, a filtered water collecting tank formed in a lower portion of the filter tank and collecting filtered water, and a backwash water outlet formed in a higher position than the influent inlet; at least one unit filter filtering the raw water which flows into the filter tank, and comprising at least one filtered water outlet protruding from a bottom of the unit filter, the unit filter joined to or separated from the filter tank by joining the filtered water outlet to the filtered water collecting tank or separating the filtered water outlet from the filtered water collecting tank of the filter tank; a sensor detecting a water level in the filter tank and then generating a control signal; an air inflow pipe extended from outside to a bottom portion of the filter tank, so that
• the gravity fiber filter may further comprise a lifting device formed in an upper end and lifting each unit filter separately when maintenance or repair is needed.
• the unit filter may comprise a perforated case which has a broad board shape structure having a cavity inside and having at least one filtered water outlet formed on the bottom, and on both sides of which at least one filtered water inflow hole is formed; a fiber filter media being a plurality of bundles of fiber, which are arranged densely on both sides of the perforated case, each lower portion of which is connected and fixed to a lower filter media holder connected to a lower portion of the perforated case, and each upper portion of which is connected to an upper filter media holder placed horizontally and separately above the perforated case; a piston rod connected to the upper filter media holder; and a cylinder, which controls the ascent and descent of the upper filter media holder by operating the piston rod so that the size of pores of the fiber filter media is controled when filtering and backwashing is performed.
• the unit filter may further comprise a compression bar disposed horizontally on an outside of the fiber filter media; a support bar disposed horizontally on both sides of the perforated case; and a support string supported by the support bar and connecting the compression bar with the upper filter media holder, wherein if the upper filter media holder ascends or descends by the operation of the cylinder, the compression bar tightens or loosens the fiber filter media, so that the pore size of the fiber filter media can be controlled successfully in a middle portion of the fiber filter media as well as in both end portions of the fiber filter media.
• the filtered water collecting tank may comprise at least one discharging guide which is a guiding pipe formed in an upper portion of the filtered water collecting tank, the filtered water outlet of the unit filter guided into the discharging guide; and a discharging pipe connected to a side of the filtered water collecting tank and guiding the collected filtered water to an outside water tank.
• the filtered water collecting tank may further comprise a drainage check valve which has a cylindrical shape, on an outer surface of which at least one hole is formed, and which enters and coming out of the discharging guide by elasticity of an elastic body, wherein when the unit filter is combined, the unit filter descends and contacts closely to the filtered water collecting tank by the weight of the unit filter so that the filtered water is discharged into the filtered water collecting tank through the hole formed on an outer surface of the drainage check valve, and when the unit filter ascends and is separated by the cylinder, the drainage check valve ascends by the elasticity of an elastic body and inserted into the discharging guide so that the drainage check valve blocks the discharging guide.
• a drainage check valve which has a cylindrical shape, on an outer surface of which at least one hole is formed, and which enters and coming out of the discharging guide by elasticity of an elastic body
• the gravity fiber filter may further comprise a guiding groove formed on an inside of both sides of the filter tank; and a sliding connection means which is formed on both narrow sides of the unit filter and slides along the guiding groove, wherein the operation of an ascending and descending of the unit filter is performed along the guiding groove so that the filtered water outlet formed on a bottom of the unit filter is connected perfectly to the filtered water collecting tank.
• the unit filter may comprise a perforated case which has a cylindrical shape structure having a cavity inside and having at least one filtered water outlet formed on the bottom, and on an outer surface which at least one filtered water inflow hole is formed; a fiber filter media being a plurality of bundles of fiber, which are arranged densely on an outside of the perforated case, each lower portion of which is connected and fixed to a lower filter media holder connected to a lower portion of the perforated case, and each upper portion of which is connected to an upper filter media holder placed separately above the perforated case; a piston rod connected to the upper filter media holder; and a cylinder, which controls the ascent and descent of the upper filter media holder by operating the piston rod so that the size of pores of the fiber filter media is controled when filtering and backwashing is performed.
• the unit filter can be exchanged without removing the water.
• the gravity fiber filter of the present invention performs filtration depending on the difference of the water level, pumping the discharged water is not needed. Accordingly, the gravity fiber filter of the present invention can reduce the maintenance expenses due to reduction of the expenses for electric power. For example, pumping power of the sewage treatment plant of 100,000D/day is about 220D, thus the expenses for the electric power is about 100,000 dollars a year. But the gravity fiber filter of the present invention can reduce such expenses.
• FIG. 1 is illustrating a structure of a gravity fiber filter of the present invention
• FIG. 2 is a cross-sectional view of a unit filter of a gravity fiber filter of the present invention
• FIG. 3 is a perspective view of a unit filter of a gravity fiber filter of the present invention.
• FIG. 4 is a perspective view of a perforated case of a unit filter of a gravity fiber filter of the present invention
• FIG. 5 is illustrating an embodiment of a unit filter of a gravity fiber filter of the present invention
• FIG. 6 is illustrating another embodiment of a unit filter of a gravity fiber filter of the present invention.
• FIG. 7 is a plan view of a gravity fiber filter of the present invention.
• FIG. 8 is illustrating a filtered water collecting tank to which a unit filter is connected
• FIG 9. is illustrating a filtered water collecting tank from which a unit filter is removed.
• FIG. 10 is illustrating an operation of a sensor of a gravity fiber filter of the present invention. Mode for the Invention
• FIG. 1 is illustrating a structure of a gravity fiber filter of the present invention
• FIG. 2 is a cross-sectional view of a unit filter of a gravity fiber filter of the present invention
• FIG. 3 is a perspective view of a unit filter of a gravity fiber filter of the present invention
• FIG. 4 is a perspective view of a perforated case of a unit filter of a gravity fiber filter of the present invention
• FIG. 5 is illustrating an embodiment of a unit filter of a gravity fiber filter of the present invention
• FIG. 6 is illustrating another embodiment of a unit filter of a gravity fiber filter of the present invention
• FIG. 7 is a plan view of a gravity fiber filter of the present invention
• FIG. 1 is illustrating a structure of a gravity fiber filter of the present invention
• FIG. 2 is a cross-sectional view of a unit filter of a gravity fiber filter of the present invention
• FIG. 3 is a perspective view of a unit filter of a gravity fiber filter of the present invention
• FIG. 4 is
• FIG. 8 is illustrating a filtered water collecting tank to which a unit filter is connected
• FIG 9. is illustrating a filtered water collecting tank from which a unit filter is removed
• FIG. 10 is illustrating an operation of a sensor of a gravity fiber filter of the present invention.
• the present invention is a filtering device which is disposed in a continuous water flow and filters the continuously flowing water.
• the present invention comprises a filter tank 10, at least one unit filter 20, a sensor 30, an air inflow pipe 40, control means 50, and backwash water discharging pipe 60.
• the gravity fiber filter of the present invention further comprises lifting device (not shown in the figure).
• the unit filter 20 comprises a perforated case 23, a fiber filter media 25, a piston rod 251, a cylinder 252, a compression bar 27, a support bar 271, and a support string 270.
• a filtered water collecting tank 100 of the filter tank 10 comprises a discharging pipe 140 and a drainage check valve 110.
• a guiding groove 130 to which a sliding connection means 235 formed on a side of the unit filter 20 is connected is formed on the inside of both sides of the filter tank 10.
• the filter tank 10 of the present invention is formed in order to block a portion of the continuous water flow and be disposed in the water.
• filter tank 10 The distinctive features of filter tank 10 are an inflow part through which a raw water to be filtered flows in and a discharge part through which a filtered water disc harges.
• An influent inlet 11, which lets the raw water flow in through a check valve 12, is formed in a side of an upper portion of the filter tank 10 and the filtered water collecting tank 100 is formed in a lower portion of the filter tank 10 in order that a water flow may be generated by gravity. (More specifically, the water flow is generated due to the difference of the water level.)
• the unit filter 20 is a filtering part disposed in the filter tank 10.
• the unit filter 20 comprises a perforated case 23, a fiber filter media 25, a piston rod 251, and a cylinder 252, more specifically, the perforated case 23 is a broad board shape structure, in the side of which a perforated surface is formed and in the bottom of which at least one filtered water outlet 230 is formed.
• the perforated case 23 is not confined to the structure of a board shape.
• the perforated case 23 may be formed in a cylindrical shape having small capacity.
• the perforated surface is a broad side of the perforated case 23 and has at least one filtered water inflow hole 239. It is more desirable to form a plurality of filtered water inflow holes 239 arranged densely. And after the raw water is filtered by the fiber filter media 25, the raw water flows into the perforated case 23 through the filtered water inflow holes 239 of both sides of the perforated case 23 and then is discharged through the filtered water outlet 230.
• the fiber filter media 25 is a plurality of bundles of fiber which are disposed densely on both sides of the perforated case 23.
• each fiber filter media 25 is connected and fixed to a lower filter media holder 28 connected to a lower portion of the perforated case 23 to form a fixed end, and the upper portion of each fiber filter media 25 is connected to an upper filter media holder 250 disposed horizontally and separately above the perforated case 23 to form a free end.
• the upper filter media holder 250 is an independant and separate holder, in which hanging means that can hang the fiber filter media 25 are disposed continuously and horizontally above the perforated case 23.
• the piston rod 251 is connected to the upper filter media holder 250, and the cylinder 252 controls the ascent and descent of the upper filter media holder 250 by operating the piston rod 251, so that the size of pores of the fiber filter media 25 is controled when filtering and backwashing is performed.
• the fiber filter media 25 is disposed in close contact with both sides of the perforated case 23 on which the filtered water inflow holes 239 are formed, and the lower portion of the fiber filter media 25 forms a fixed end and the upper portion of the fiber filter media 25 forms a free end against the perforated case 23, thus the tention of the fiber filter media 25 is controlled, i.e., the size of pores of the fiber filter media 25 is controlled, by the operation of ascending and descending of the free end.
• the unit filter 20 further comprises a compression bar 27, a support bar 271 and a support string 270, more specifically, the compression bar 27 is disposed on the outside of the middle of the fiber filter media 25 across the fiber filter media 25 and is connected with the support string 270.
• the support bar 271 is connected to the perforated case 23 of the unit filter 20 and supports the tension of the support string 270.
• the support string 270 is connection line connecting the upper filter media holder 250 and the compression bar 27, and the operation of ascending and descending of the cylinder 252 is transferred to the compression bar 27 due to the support string 270 so that the fiber filter media 25 is tightened or loosened.
• the support string 270 may be guided from the inside of the perforated case 23 and be extended to the upper filter media holder 250. Or, as shown in the FIG. 5, the support bars 271 may be formed inside and outside of the perforated case 23 respectively, and the support string 270 connected to the compression bar 27 is supported by an inner support bar, and then the support string 270 is guided to an outer support bar and extended to the upper filter media holder 250. Or, as shown in the FIG. 6, the support string 270 may be extended along the outside of the perforated case 23.
• the support bars 271 may be formed inside and outside of the perforated case 23 respectively, and the support string 270 connected to the compression bar 27 is supported by an inner support bar, and then the support string 270 is guided to an outer support bar and extended to the upper filter media holder 250.
• the support string 270 may be extended along the outside of the perforated case 23.
• the movement of ascending and descending of the upper filter media holder 250 due to the cylinder 252 is transferred by the support string 270, and thus the support string 270 supported by the support bar 271 presses the compression bar 27 onto the perforated case 23 or loosens the compression bar 27.
• the filtered water outlet 230 formed on the bottom of the perforated case 23 is connected to or separated from a filtered water collecting tank 100 of the filter tank 10 by the operation of ascending or descending of a lifting device (not shown in the figure).
• a guiding groove 130 is formed on insides of both sides of the filter tank 10, and a sliding connection means 235 which is formed on both narrow sides of the perforated case 23 and slides along the guiding groove 130. Accordingly, the operation of ascending and descending of the unit filter 20 by the lifting device (not shown in the figure) is guided by the guiding groove 130, so that, as shown in the FIG. 1 and 8, the filtered water outlet 230 formed on the bottom of the unit filter 20 is connected to or separated from the filtered water collecting tank 100 of the filter tank 10.
• the filtered water collecting tank 100 of the filter tank 10 of the present invention has a discharging pipe 140 and a discharging guide 101.
• the filtered water outlet 230 of the unit filter 20 is guided into the discharging guide 101 disposed at the bottom of the filter tank 10.
• the discharging guide 101 and the filtered water outlet 230 are formed in a cylindrical or a square pillar shape with a certain length, and the filtered water outlet 230 is inserted into or separated from the discharging guide 101 depending on the operation of the cylinder 252.
• the filtered water collecting tank 100 is a chamber, in which the filtered water filtered in the unit filter is collected, and to which a certain pressure is applied due to the filtered water that flows in.
• the discharging pipe 140 is a pipe connecting the filtered water collecting tank 100 and outside water tank 300.
• the filtered water gathered in the filtered water collecting tank 100 is discharged to the outside water tank 300 by the pressure of the interior and the gravity due to the difference of the water level.
• a drainage check valve 110 is formed in the lower portion of the discharging guide 101 of the filtered water collecting tank 100. While filtering and backwashing, as shown in the FIG. 8, the flow of the filtered water between the inside of the unit filter 20 and the filtered water collecting tank 100 is formed. And when the unit filter 20 is lifted in order to repair, as shown in the FIG. 9, the flow of the filtered water between the inside of the unit filter 20 and the filtered water collecting tank 100 is blocked.
• the drainage check valve 110 comprises a stopper 111 inserted into or seperated from the discharging guide 101 due to the elasticity of an elastic body 112 (for example, a spring).
• an elastic body 112 for example, a spring.
• At least one hole 113 is formed on the outer surface of the stopper 111 of the drainage check valve 110.
• the filtered water collecting tank 100 comprises the discharging pipe 140 extended from the filtered water collecting tank 100 to the outside of the filter tank 10 and extended in the upper direction. But the discharging pipe 140 is extended to the lower position than the influent inlet 11 of the filter tank 10.
• the raw water flowing into the filter tank 10 is filtered while the water level rises upto the height of the influent inlet 11.
• the height of the influent inlet 11 is hereinafter referred to as Water Level 1, i.e., WLl
• the sensor 30 of the present invention is a sensor detecting the water level.
• a certain water level may be predetermined, and if the water level rises to the predetermined water level, washing the unit filter 20 may be perfromed.
• the hpredetermined water level is hereinafter referred to as Water Level 2, i.e., WL2)
• the WL2 may be determined variablly according to the requirement of washing.
• the WL2 may be determined variablly according to the requirement of washing, but, as shown in the FIG. 10, it is desirable that the WL2 is equal to the height of the upper portion of the influent inlet 11, which is the water level that the raw water flows in no more. And the filtration time is determined depending on the height cor- responding to WL2-WL1.
• the sensor 30 detects WL2 and generates a control signal.
• a backwash process begins depending on the control signal of the sensor 30.
• the backwash process is performed by the backwash air flowing in through the air inflow pipe 40, and the backwash water flowing backward in from the filtered water collecting tank 100.
• the air inflow pipe 40 comprises an air pipe 45 extended from outside to a lower portion of the filter tank 10, and an air pump and a valve 41 supplying air to the air inflow pipe 40 through the air pipe 45. And accordint to the control signal of the sensor 30, the backwash air flows in from the bottom of the filter tank 10.
• the air inflow pipe 40 is a chamber at which holes are formed in order that the air may jet out to the unit filter 20.
• a control means 50 is formed in a side of the filtered water collecting tank 100 and controls the inflow of the backwash water according to the control signal of the sensor 30. If the backwash water flows in due to the operation of the control means 50, the backwash water transfers the suspended solids shaken off by the vibration of the bubbles upward, and rises the water level.
• control means the natural backflow control by the outside water tank 300 connected to the filtered water collecting tank 100 and the pump 150 operated by the control signal and assisting the inflow of the backwash water may be used.
• the natural backflow control means that if the outside water tank 300 is connected to the filter tank 10 and the backwash water flows in, the wter in the outside water tank 300 flows backward so that the water level of the filter tank 10 rises.
• the pump 150 may be used.
• the backwash water discharging pipe 60 is not confined to a pipe, but the watercourse also may be considered as the backwash water discharging pipe 60.
• the kind of suspended solids flowing into the filter tank 10 is various. Therefore, light suspended solids may be risen by the backwash water and air, but heavy suspended solids or organic suspended solids having viscosity, etc. may sink downward.
• the deposited suspended solids are discharged through the air inflow pipe 40 formed at the bottom of the filter tank 10, and thus it is desirable that the air inflow pipe 40 is formed to open and shut the inflow path of the air and discharging path of the suspended solids selectively.
• the pore size of the fiber filter media 25 of the unit filter 20 is controlled by the cylinder 252 and the piston rod 251.
• the fiber filter media 25 is connected to the upper filter media holder 28 connected with the piston rod 251, and thus the pore size of the fiber filter media 25 is controlled by the operation of ascent and descent of the cylinder 252 formed in the upper portion of the outside of the filter tank 10.
• the cylinder 252 is operated by the control signal of the sensor 30, when the water level is at the normal filtration water level WLl, the cylinder 252 ascends so that the pore size of the fiber filter media 25 decreases, and when the water level is at WL2, the cylinder 252 descends so that the pore size of the fiber filter media 25 increases.
• the unit filter when a unit filter needs to be repairing, the unit filter is lifted up by the lifting device and repaired. When one unit filter is repaired, the filtration and backwash process are performed continuously by the other unit filters.

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• Chemical & Material Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Water Supply & Treatment (AREA)
• Filtration Of Liquid (AREA)
• Filtering Materials (AREA)
• Pens And Brushes (AREA)

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Citations (4)

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• 2004
  • 2004-05-18 KR KR10-2004-0035180A patent/KR100476851B1/ko active IP Right Grant
• 2005
  • 2005-05-13 JP JP2007513072A patent/JP4584988B2/ja active Active
  • 2005-05-13 ES ES05746064T patent/ES2369015T3/es active Active
  • 2005-05-13 WO PCT/KR2005/001415 patent/WO2005115585A1/en active Application Filing
  • 2005-05-13 PL PL05746064T patent/PL1748829T3/pl unknown
  • 2005-05-13 AT AT05746064T patent/ATE516867T1/de not_active IP Right Cessation
  • 2005-05-13 US US11/596,195 patent/US7704382B2/en not_active Expired - Fee Related
  • 2005-05-13 EP EP05746064A patent/EP1748829B9/en not_active Not-in-force
  • 2005-05-13 CN CN2005800159110A patent/CN1953796B/zh active Active

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