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WO2007076019A2 - Couche filtrante et appareil pour la filtration d'eau - Google Patents

Couche filtrante et appareil pour la filtration d'eau Download PDF

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Publication number
WO2007076019A2
WO2007076019A2 PCT/US2006/049041 US2006049041W WO2007076019A2 WO 2007076019 A2 WO2007076019 A2 WO 2007076019A2 US 2006049041 W US2006049041 W US 2006049041W WO 2007076019 A2 WO2007076019 A2 WO 2007076019A2
Authority
WO
WIPO (PCT)
Prior art keywords
filter media
wearing surface
face wearing
fibrous component
backing material
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/US2006/049041
Other languages
English (en)
Other versions
WO2007076019A3 (fr
Inventor
Donald D. Ricketts
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Wastewater Technology Inc
Original Assignee
Wastewater Technology Inc
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
Application filed by Wastewater Technology Inc filed Critical Wastewater Technology Inc
Publication of WO2007076019A2 publication Critical patent/WO2007076019A2/fr
Publication of WO2007076019A3 publication Critical patent/WO2007076019A3/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • B01D39/20—Other self-supporting filtering material ; Other filtering material of inorganic material, e.g. asbestos paper, metallic filtering material of non-woven wires
    • B01D39/2027—Metallic material
    • B01D39/2041—Metallic material the material being filamentary or fibrous
    • B01D39/2048—Metallic material the material being filamentary or fibrous otherwise bonded
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D39/00—Filtering material for liquid or gaseous fluids
    • B01D39/08—Filter cloth, i.e. woven, knitted or interlaced material
    • B01D39/083—Filter cloth, i.e. woven, knitted or interlaced material of organic material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D39/00—Filtering material for liquid or gaseous fluids
    • B01D39/08—Filter cloth, i.e. woven, knitted or interlaced material
    • B01D39/086—Filter cloth, i.e. woven, knitted or interlaced material of inorganic material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D39/00—Filtering material for liquid or gaseous fluids
    • B01D39/10—Filter screens essentially made of metal
    • 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
    • B01D39/20—Other self-supporting filtering material ; Other filtering material of inorganic material, e.g. asbestos paper, metallic filtering material of non-woven wires
    • B01D39/2027—Metallic material
    • B01D39/2041—Metallic material the material being filamentary or fibrous
    • B01D39/2044—Metallic material the material being filamentary or fibrous sintered or bonded by inorganic agents
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
    • C02F1/004—Processes for the treatment of water whereby the filtration technique is of importance using large scale industrial sized filters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
    • B01D2239/04—Additives and treatments of the filtering material
    • B01D2239/0442—Antimicrobial, antibacterial, antifungal additives
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
    • B01D2239/04—Additives and treatments of the filtering material
    • B01D2239/0464—Impregnants
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
    • B01D2239/04—Additives and treatments of the filtering material
    • B01D2239/0471—Surface coating material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
    • B01D2239/06—Filter cloth, e.g. knitted, woven non-woven; self-supported material
    • B01D2239/0604—Arrangement of the fibres in the filtering material
    • B01D2239/0618—Non-woven
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
    • B01D2239/06—Filter cloth, e.g. knitted, woven non-woven; self-supported material
    • B01D2239/0604—Arrangement of the fibres in the filtering material
    • B01D2239/064—The fibres being mixed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
    • B01D2239/06—Filter cloth, e.g. knitted, woven non-woven; self-supported material
    • B01D2239/065—More than one layer present in the filtering material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
    • B01D2239/06—Filter cloth, e.g. knitted, woven non-woven; self-supported material
    • B01D2239/065—More than one layer present in the filtering material
    • B01D2239/0654—Support layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
    • B01D2239/06—Filter cloth, e.g. knitted, woven non-woven; self-supported material
    • B01D2239/065—More than one layer present in the filtering material
    • B01D2239/0668—The layers being joined by heat or melt-bonding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
    • B01D2239/06—Filter cloth, e.g. knitted, woven non-woven; self-supported material
    • B01D2239/065—More than one layer present in the filtering material
    • B01D2239/0677—More than one layer present in the filtering material by spot-welding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
    • B01D2239/06—Filter cloth, e.g. knitted, woven non-woven; self-supported material
    • B01D2239/065—More than one layer present in the filtering material
    • B01D2239/0681—The layers being joined by gluing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
    • B01D2239/08—Special characteristics of binders
    • B01D2239/086—Binders between particles or fibres
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/50—Treatment of water, waste water, or sewage by addition or application of a germicide or by oligodynamic treatment
    • C02F1/505—Treatment of water, waste water, or sewage by addition or application of a germicide or by oligodynamic treatment by oligodynamic treatment

Definitions

  • This invention relates to novel filter media that can advantageously be employed in the field of water filtration.
  • the filter media can be engineered to capture particles smaller than 5 microns, yet are easily backwashed to release captured particles.
  • Methods of manufacturing the filter media and apparatus and methods of using the filter media of the invention are also disclosed.
  • Filtering water such as wastewater before discharge to the environment by means of a tertiary filter, is well known as described in copending application, U.S. Application No. 11/066,274 filed February 28, 2005, now published as U.S. Publication No. 2005-0139557 Al.
  • a tertiary filter has previously been employed in filtering treated wastewater before discharge to the environment to filter particles on the order of 5-10 microns and larger from the treated wastewater.
  • Such filters have heretofore employed a filter cloth of matted fibers, known simply as a "felt" as the means for capturing particles.
  • a filter cloth of matted fibers known simply as a "felt" as the means for capturing particles.
  • One illustration of such a material is shown in U.S. Patent 5,374,360.
  • the present invention utilizes a novel filtering media can generally be described as a rigid backing material and a flexible face material between which fibers are situated.
  • the fibers can take several forms, such as a chopped stable fiber batting, or even a plurality of long pile fibers attached to a backing as in the aforementioned U.S. Patent No. 6,103,132.
  • Fig. 1 is a schematic representation of one embodiment of the filter media according to the invention partially sectioned to illustrate components thereof.
  • Fig. 2 is a schematic representation in cross section of the use of the filter media according to the invention to filter water to remove entrained solids therein.
  • Fig. 3 is a schematic representation according to Fig. 2 during which entrained particles are being backwashed into a suction head.
  • Fig. 4 is similar to the cross sectional view of Fig. 2 for the use of another embodiment of filter medium of Fig. 2 and employs a modified suction head incorporating a liquid spray head.
  • Fig. 5 is a schematic representation of Fig. 4 during operation of backwashing of the filter media to remove external particles.
  • the present invention prevents such detriments of the prior art by providing novel filter media.
  • the filter media 10 of the invention comprises a rigid backing material 12.
  • the rigid backing material may be formed of metal, such as a screen, perforated plate or other formaminous material but preferably is formed of a polymeric material, such as a plastic which is resistant to the environment in which it is used, e.g., resistant to degradation when immersed in water, resistant to stretching, both during filtering and upon backwashing and is otherwise inert to the other components of the filter media and the water being filtered.
  • the open, area and the size of the opening in rigid backing material 12 is not critical to the filtering ability of the filter media, but it must cooperate with the other components for structural integrity during the filtering process.
  • the second component of the filtering media is a face wearing surface 14.
  • face wearing surface 14 is formed of a flexible material.
  • the most preferred material for face wearing surface 14 is a polymeric material formed into a net or screen as illustrated in Figure 1. This polymeric material is preferably formed of a low friction material or may be alternatively formed of a metal or a metal coated with a polymeric low friction material, such as polytetrafiuoroethylene (PTFE).
  • PTFE polytetrafiuoroethylene
  • face wearing surface 14 is formed as a flexible material is because in use during the backwashing stage of the filtering process, it preferably enters into the suction head, or alternatively, is drawn near to the suction head, to thereby permit the expansion of the volume of the fibrous component to release entrained particles.
  • the third component of the filter media is a fibrous material.
  • a suitable form of fibrous material is a chopped staple fiber batting 13 sandwiched between rigid backing material 12 and face wearing surface 14.
  • fiber batting maybe formed from strands of long fibers. These long fibers may be orderly or randomly placed on backing material 12 and looped back upon themselves, e.g., as in carpet fibers. Such a structure can greatly reduce or eliminate the odds of ends of chopped fibers from penetrating face wearing surface 14.
  • Such fibers, in cross-section, may have a shape which is substantially cylindrical, elliptical, or of an alternate shape, such as dual- or tri-lobal, or any other regular or irregular, crimped or crimped shape along its length.
  • the long pile fibers of the batting are permanently affixed only to the backing material 12 leaving a free end of the fibers, i.e., either the unfixed end or the middle section when both ends are affixed to the backing material 12.
  • one end of the fibers is affixed to the backing material, and the opposite end (or a middle section) is affixed to' the face wearing surface 14.
  • the fibers can be joined to the face wearing surface 14 by the same or different method as used to join to the backing material, or the fibers may simply be adhered to the material which defined the openings in the face wearing surface 14. Other embodiments using long pile fibers will be described below.
  • the fibers do not limit fluid flow through the face wearing surface 14.
  • the fiber batting 13 may have antimicrobial, antifungal and/or antibiotic properties in order to control or eliminate growth of unwanted microorganisms on the batting itself. The presence of such microorganisms can impair the filtering and/or damage the batting.
  • the antimicrobial, antifungal and/or antibiotic properties may be achieved by incorporating an antimicrobial, antifungal and/or antibiotic reactive agent into the fibers themselves, such as by impregnation of chemical agents, or inclusion of materials having catalytic antimicrobial properties (e.g., cationic metals, such as copper or silver).
  • Metallic or fibrous strips or elements having such properties e.g., formed of materials as described in U.S. Patent Nos. 6,482,424 and 5,458,906 and those often used in dentistry, may also be utilized, by being affixed to or incorporated into the structure of the batting.
  • the chopped staple fiber batting 13 can be made into a compressible mat in which intersections of the fibers are preferably adhered at points of intersection.
  • Such adherence can be achieved by heat, sonic or microwave welding, solvent, or adhesive bonding as well as other conventional bonding techniques known in the art.
  • each fiber As laid down, the longitudinal portion of each fiber is generally aligned with the longitudinal dimension of the resulting mat. hi such a form, the individual fibers will not extend beyond the face wearing surface 14.
  • the type of fiber used in the fiber batting 13 is not critical so long as it is inert to the process fluid being filtered, and is not degraded under the typical process conditions of filtering.
  • fiber batting 13 is designed to be compressible under the conditions of filtering such that it compresses and forms flow channels therethrough that are generally smaller than the flow channels therethrough when the fiber batting 13 is being backwashed.
  • the filter media 10 As shown for example in Figure 2, as the filter media 10 is being used to filter process fluid, such as treated wastewater containing entrained solids, the filter media 10 is in a compressed state, caused by the the fluid flow shown by arrows 15.
  • process fluid such as treated wastewater containing entrained solids
  • the fiber batting 13 expands under the effect of the reduced pressure in suction head 16 so as to enlarge the flow channels under the effect of the backwash shown by arrows 17 with the flow channels releasing the solids 18 captured by the fiber batting 13 into suction head 16 to be either removed from the process or recycled to an upstream portion of the water treatment cycle.
  • the suction head 16 is provided with rounded corners 19, 20, 21 and 22 at both the leading and trailing edges of the suction head as well as at the suction head opening so as to reduce stress on the face wearing surface 14 and as surface 14 is preferably of a low friction material, preferably a polymer, or polymer coated metal, with the polymer most preferably being PTFE, nylon, or polyurethane, protecting the fibrous batting 13, there is no likelihood of damaging the fibrous material 13.
  • Such corners may be attached to suction head 16 by any suitable means, including the bolts and nuts 23, 24 as shown in Figures 2-3.
  • the fiber media of the present invention suitable not only for filtering process wastewater for ultimate discharge as surface water, e.g., irrigation, but also for filter water suitable for use as drinking water.
  • the face material wearing surface 14 must have openings much larger than that of the entrained solids to permit the solids to pass through, not only to prevent clogging of wearing surface 14 by the solids during filtering, but also to permit high throughput of filtered process fluid.
  • the openings in backing material 10 suitably are larger than the solids being captured to permit high flow of treated process water.
  • the initial density of the fiber batting 13 together with its compressibility under filtering process conditions determines the size of entrained solids that it will capture.
  • those skilled in the art will be able to fabricate filter media for a wide variety of filtering specifications, not only for wastewater or drinking water specifications but for other types of fluid processing.
  • chopped staple fiber batting 13 as a suitable fibrous media in Figures 1-3
  • the invention is also applicable to the use of a filter cloth comprising a plurality of long pile fibers attached to a backing as shown in the aforementioned U.S. Patent No. 6,103,132.
  • such a filter cloth may be used provided the free ends (e.g., the ends opposite the backing) of the fibers do not extend beyond face material wearing surface 14.
  • the flow of the fluid compresses the filter cloth to collapse the fibers in random manner creating tortuous channels between the fibers to capture the entrained solids.
  • the face ends of the long pile fibers may be prevented from extending beyond the wearing surface 14 by attaching the fabric backing of the filter cloth to the rigid backing 10 by any known manner, e.g., mechanical attachment, spot welding, or adhesive.
  • the face ends may be optionally attached to the wearing surface 12 by sonic, thermal or solvent welding, adhesive other mechanism.
  • the free ends of the individual long pile fibers may be melted or welded into clumps distal their attachment to backing, increasing the size of the ends of the fibers and, preventing them from extending beyond wearing surface 14.
  • suction head 26 is provided with leading and trailing edge 29, 30 which are curved so as not to snag wearing surface 14 or the long pile fibers. Furthermore, interior surfaces 31, 32 are also provided with a curved cross-section so as to not disrupt wearing surface 14.
  • a fluid spray head 28 is operatively connected to a conduit 33 for delivering a pressurized fluid to spray head 28 which can be used to assist in mechanical dislodgement of solids 18 or, alternatively, be used to treat the fibers with chemical agents, e.g., fungicide, mildewicide, and/or similar bio-active agents to prolong the effectiveness of the filtering process.
  • chemical agents e.g., fungicide, mildewicide, and/or similar bio-active agents to prolong the effectiveness of the filtering process.
  • bio-active treatment and hydraulic dislodgement can be performed simultaneously or sequentially.
  • My filter media can be used in the filtering apparatus and methods of the prior art, such as the aforementioned U.S. Patents No. 5,374,360 and 6,103,132 or in the apparatus and methods disclosed in my copending application, U.S. Application No. 11/066,274, now published as U.S. Publication No. 2005-0139557 Al, as well as in other filtering processes.
  • my invention has utility in both static and dynamic filters as well as in static and dynamic operation of the suction heads.
  • My disclosure here is only exemplary and not by way of limitation.
  • the relative positions of the suction head as being to the left of the filter media is illustrative only and any position to the right, up, down, the direction of movement, the positioning of one or a plurality of suction heads in one or more locations, reciprocating, rotational or stationary suction heads or obvious modifications of the components, and structure of my filter media are all with the scope of my disclosure.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Inorganic Chemistry (AREA)
  • Textile Engineering (AREA)
  • Hydrology & Water Resources (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Organic Chemistry (AREA)
  • Filtering Materials (AREA)

Abstract

La présente invention concerne une couche filtrante destinée à être utilisée dans le domaine de la filtration d'eau comportant une couche de support rigide et une couche de surface souple et un composant fibreux entre les couches rigide et souple.
PCT/US2006/049041 2005-12-23 2006-12-21 Couche filtrante et appareil pour la filtration d'eau Ceased WO2007076019A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US75289005P 2005-12-23 2005-12-23
US60/752,890 2005-12-23

Publications (2)

Publication Number Publication Date
WO2007076019A2 true WO2007076019A2 (fr) 2007-07-05
WO2007076019A3 WO2007076019A3 (fr) 2007-11-29

Family

ID=38218669

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2006/049041 Ceased WO2007076019A2 (fr) 2005-12-23 2006-12-21 Couche filtrante et appareil pour la filtration d'eau

Country Status (1)

Country Link
WO (1) WO2007076019A2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4464395A1 (fr) * 2023-05-15 2024-11-20 R+F FilterElements GmbH Tissu filtrant comprenant des ions métalliques antimicrobiens

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3327859A (en) * 1963-12-30 1967-06-27 Pall Corp Portable unit for potable water
US5407574A (en) * 1987-01-09 1995-04-18 Hensley Clifford J Filter media for filter systems
US5667544A (en) * 1996-04-29 1997-09-16 Aaf International Extended life filter apparatus
DE602004024171D1 (de) * 2003-01-29 2009-12-31 Wwetco Llc Vorrichtung und verfahren zur flüssigkeitsfilterung

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4464395A1 (fr) * 2023-05-15 2024-11-20 R+F FilterElements GmbH Tissu filtrant comprenant des ions métalliques antimicrobiens

Also Published As

Publication number Publication date
WO2007076019A3 (fr) 2007-11-29

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