WO1999049950A1 - A band filter for liquid and gas purification - Google Patents

A band filter for liquid and gas purification Download PDF

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Publication number
WO1999049950A1
WO1999049950A1 PCT/AU1998/000213 AU9800213W WO9949950A1 WO 1999049950 A1 WO1999049950 A1 WO 1999049950A1 AU 9800213 W AU9800213 W AU 9800213W WO 9949950 A1 WO9949950 A1 WO 9949950A1
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WO
WIPO (PCT)
Prior art keywords
filter
band
filtrate
chamber
medium
Prior art date
Application number
PCT/AU1998/000213
Other languages
French (fr)
Inventor
Peter Anthony Miller
Original Assignee
Peter Anthony Miller
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 Peter Anthony Miller filed Critical Peter Anthony Miller
Priority to PCT/AU1998/000213 priority Critical patent/WO1999049950A1/en
Priority to AU67119/98A priority patent/AU6711998A/en
Publication of WO1999049950A1 publication Critical patent/WO1999049950A1/en

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Classifications

    • 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
    • B01D29/09—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 filtering bands, e.g. movable between filtering operations
    • 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
    • B01D29/01—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 flat filtering elements
    • B01D29/05—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 flat filtering elements supported
    • B01D29/07—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 flat filtering elements supported with corrugated, folded or wound filtering sheets
    • 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
    • B01D2201/00—Details relating to filtering apparatus
    • B01D2201/12—Pleated filters

Definitions

  • the invention concerns a genre of band filter with a filter chamber that conforms in general with the apparatus described in GB PS 2280857.
  • Fig.l, and Fig.17, Pos.9 was the application of this genre of filter for solid/liquid separation operations in the chemical, pharmaceutical, food and beverage industries.
  • some important applications have in fact been achieved in the pharmaceutical and fine chemical industries. It has become apparent however that to achieve acceptance over the whole breadth of the liquid processing industries, including gas purification applications, further innovations in the fields of filter media, control, accessibility, cleaning and sterilization are required.
  • Fig.2 shows schematically the general principle of the solution to this requirement:
  • lovedOne-way filter material in the form of storage rolls 209 ⁇ _ 210 as well as stacked sheets in cassettes 226 situated externally to the filter apparatus are fed as single sheets, by means of a cutting mechanism 208 and feed devices 220, 221, 225, 213, 214, on a section of moving filter band 201 into the filter chamber and located in sealing position. After filtration the sheet and the collected residues .are transported by the travelling section of band from the filter chamber.
  • the solution is to provide a filter band 217 out of a plurality of individually removable band sections 201, 202, 203, whereby the individual sections are joined by such devices as pin and loop connections 204, 205, 206.
  • the turbid liquid chamber resp receiver consists of a sealed lid 325 resp.
  • the filter band with the filter element is transported out of the filter chamber by means of a motor-driven roller 316 Subsequent to travelling over this roller, the filter element is led vertically downwards and underneath a further deflection roller 329 fitted with a built-in ultrasonic generator 338. Any layer of residues on the surface of the element is thereby removed by the influence of the ultrasonic generator supported by the spreading action of the folds of the pleated sections of the element caused by the contours of the roller.
  • the filter element is then led into the lower spraying compartment 334 in a counter-clockwise direction over an innovative deflection roller or fixed rounded surface 332, whereby in a preferred version the protruding element is accomodated in a recess 434 with respect to the lateral parts of the roller or deflection surfaces
  • the band travel is preferably tracked by providing recesses 420 in the roller or -3- lateral deflection surfaces into which the edges of the band or sections of band fit
  • the element is then deflected in a clock-wise direction past spray nozzles 331, whereby high pressure sprays impinge on the top and bottom surfaces of the pleated element From the spray compartment the element passes into a bath compartment 333 where the band comes to a stillstand once the element is completely submerged in the bath of liquid
  • the soaking bath is fitted with an ultrasonic device 337 to aid in the dissolving and/or decomposing action of the liquid on the material blocking the pores of the particular medium making up the element According to the invention, depending on the particular application,
  • Fig.6 illustrates schematically an element 620 with spaces 645 for accomodating solid residues formed by pleated media with pressure-resisting filtrate drainage inserts 649 suitable for micronic filtration, e.g. sterile filtration, with high flux and solids' recovery from water, chemicals, beverages, food and gases
  • Fig.7 shows a preferred execution of the element, whereby the individual folds consist of a thin, outer membranous layer 743 supported by and fixed to a thicker, more pervious layer 747 that when pleated is fitted with the above mentioned drainage inserts and then joined at the base to even more pervious and stronger flat section of filter band 745 provided with a peripheral impervious strip coinciding with the sealing surfaces of the filter lid resp. frame.
  • medium area densities in excess of 50m 2 /m 2 of belt can be accommodated Due to -4- or filtrate quality problems during the production operation is carried out. by microprocessor control.
  • the previously described apparatus consisting of media storage rolls Fig.2, 209, 210 or cassettes 226 are utilized.
  • a sealed sheet of test medium in the filter chamber a set volume of the turbid liquid to be filtered is dosed to the filter chamber by means of level controller Fig.11, 1106.
  • Compressed gas is then fed through the throttling valve Fig.1/11, 104 while the gas flow at a set pressure is measured by controllers 126, 125, respectively thus giving the specific through-put of filtration.
  • the quality of the filtrate is monitored by instrumentation 1107.
  • the sheet of test medium is subsequently discharged from the chamber and if necessary further ams are carried out to optimize the choice of medium.
  • Fig.12/13 show an innovative shell arrangement that obviates such a restriction.
  • the shell is divided horizontally into at least 2 pieces 1201, 1202, whereby preferably the peripheral upper surface of the filtrate chamber 1203 is used as a sealing surface for the lower rim of the vertically movable upper lid-shaped part 1201 and the peripheral lower surface of the filtrate chamber is employed as a sealing surface for the rim of the vertically movable trough-shaped part 1202. -5-
  • a im 2 band filter of the genre of the present invention will achieve a similar performance to state-of-the-art pressure filters illustrated at Fig.17, Pos.1/2/3 with an estimated filter area of 500m 2 .
  • a im 2 filter of the present invention as part of a water treatment plant could supply purified water for the population of a large city Fig.10 shows the principle of the innovative electrostatic filter bed process used in this application, whereby with ca. 5mm beds of regenerable ca. 50 micron surface-charged beads 1004 supported on submicronic pleated elements, sterile water can be produced with compact plant on a large scale. Similar economies accrue for applications in breweries, sugar factories, chemical plants, etc.
  • Fig.8/9 show an innovative filter element 820 consisting of densly packed membranous pleats out of composite material 843/847, whereby the means of filtrate drainage are provided by the support layer 847 and interface 849.
  • filter medium densities of up to and exceeding 200m 2 /m 2 of band and operating pressures up to 20 bar, difficult micro-, ultra-filtration and reverse osmosis applications can be carried out. with these elements including medium regeneration in fully automatic operation.
  • Fig.16 illustrates an innovative type of element 1601 out of packed material such as glass fibre, beads, etc. as well as regenerable activated material such as activated carbon, bleaching earth, ion exchange material, molecular sieves, zeolites, etc.
  • the wall part of the element 1603 is preferentially fabricated out of some form of elastomer and the roof part 1604 out of woven synthetic monofilament fibre.
  • the filter cleaning apparatus disclosed in GB 2280857 comprises fixed nozzles surrounding the filter chamber, whereby many internal surfaces of the chamber remain untouched by the sprays.
  • the said disclosure suggests that for cleaning the filtrate chamber surfaces * removable band-supporting and filtrate drainage elements are provided which after manual removal leave mainly plane surfaces for cleaning. This manual intervention as well as the necessary manual removal of the filter band would be unacceptable in a fully automated plant.
  • Fig.14/15 illustrate the innovative solution according to the present invention of improving and automating this crucial operation. It consists essentially of a transportable manifold 1408 lying outside the filter chamber but inside the top shell 1411 during the filtration operation fitted with spray nozzles 1405.
  • an external actuator 1401 pushes the nozzle manifold mounted on rails 1402 into the opened filter chamber * where, on reaching a central position within the chamber, it comes to rest and is connected at one end to an external oscillating actuator 1407 and at the opposite end to an external source of pressurized cleaning fluid 1404.
  • the manifold is transported backwards and forwards inside the interior of the filter chamber by laterally positioned subsidary feed conduits situated on the main manifold and fitted with extra * horizontally orientated nozzles.
  • this arrangement avoids mechanical actuators in that the cleaning and actuating fluid is controlled solely by external valves connected to movable hoses within the upper shell.
  • the filtrate drainage member consists of a pattern of grooves, slits and channels cut into the upper surface 1406 of a plate 1409 leading to one or a plurality of filtrate exit nozzles 1410 an hence to a filtrate receiver not shown, whereby according to the invention, during the cleaning and/or sterilizing operation a

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)

Abstract

A sealed band filter for the purification of fluids that by means of innovative filter media systems, means of control, accessibility and maintenance of cleanliness and sterility offers substantial operating economies compared with state-of-the-art equipment in the fields of chemical, pharmaceutical, food and beverage production as well as communal and industrial water and effluent treatment.

Description

-1- A band filter for liquid and gas purification DESCRIPTION
The invention concerns a genre of band filter with a filter chamber that conforms in general with the apparatus described in GB PS 2280857. The disclosed goal of this apparatus, Fig.l, and Fig.17, Pos.9, was the application of this genre of filter for solid/liquid separation operations in the chemical, pharmaceutical, food and beverage industries. Recently, based on the suggestions made in this disclosure* some important applications have in fact been achieved in the pharmaceutical and fine chemical industries. It has become apparent however that to achieve acceptance over the whole breadth of the liquid processing industries, including gas purification applications, further innovations in the fields of filter media, control, accessibility, cleaning and sterilization are required.
Filter media
• The state-of-the-art apparatus shown in Fig, 17 lack the capability in ermergency, e.g. for handling unexpectedly intractable slurries or turbidities, of switching automatically to „one-way" filter medium such as paper* membranes, etc.
Fig.2 shows schematically the general principle of the solution to this requirement: „One-way" filter material in the form of storage rolls 209 <_ 210 as well as stacked sheets in cassettes 226 situated externally to the filter apparatus are fed as single sheets, by means of a cutting mechanism 208 and feed devices 220, 221, 225, 213, 214, on a section of moving filter band 201 into the filter chamber and located in sealing position. After filtration the sheet and the collected residues .are transported by the travelling section of band from the filter chamber.
• The automated application of regenerable medium chosen from varying types of filter media during operation is not possible with state-of-the-art filters. The renewal or change of medium with filter apparatus illustrated in Fig.17, Pos.1-8 is mostly associated with long plant shut-downs and intensive manual labour. According to the present invention, the solution is to provide a filter band 217 out of a plurality of individually removable band sections 201, 202, 203, whereby the individual sections are joined by such devices as pin and loop connections 204, 205, 206.
• A long standing, problem with state-of-the-art micro ultra-filtration and reverse osmosis -2- apparatus is the lack of devices for acceptable regeneration of the medium once blockage has occured Most of these apparatuses take the form of candles enclosed in pressure vessels with at least 2 openings When blockage occurs the elements are normally manually renewed, whereby nowdays the contaminated candles pose an increasing disposal problem To avert this situation past disclosures such as US PS 5560835 have described continuously moving pleated bands operating with under-pressure for fluid purification of the genre depicted in Fig.17, Pos.6 Contrary to this teaching and central to the present inventive concept is the realisation that only intermittently moving bands operating preferably with over-pressure and with far more effective media regeneration, sealing, control, cleaning and sterilisation capability have the necessary technological prerequisites to fulfil the stringend demands for cost-effective application in the broader fields of fluid purification Fig.3 shows the innovative solution of the present invention to this problem This schematically illustrated band filter plant of the present invention consists essentially of a lower filtrate chamber 322 and an upper turbid fluid chamber or receiver 321/324. Between the filtrate chamber and the turbid fluid chamber resp receiver is a support surface 319 that lies on the filtrate chamber 322 along which a filter band composed of a plurality of pleated or packed filter elements 321, 1601 is intermittently transportable The turbid liquid chamber resp receiver consists of a sealed lid 325 resp. framework 327 that is actuated in the vertical direction by pressure cylinders 326, whereby the smooth, unpleated peripheral part 421 of the filter element acts as a chamber-sealing gasket After the filtration, the filter band with the filter element is transported out of the filter chamber by means of a motor-driven roller 316 Subsequent to travelling over this roller, the filter element is led vertically downwards and underneath a further deflection roller 329 fitted with a built-in ultrasonic generator 338. Any layer of residues on the surface of the element is thereby removed by the influence of the ultrasonic generator supported by the spreading action of the folds of the pleated sections of the element caused by the contours of the roller. The filter element is then led into the lower spraying compartment 334 in a counter-clockwise direction over an innovative deflection roller or fixed rounded surface 332, whereby in a preferred version the protruding element is accomodated in a recess 434 with respect to the lateral parts of the roller or deflection surfaces The band travel is preferably tracked by providing recesses 420 in the roller or -3- lateral deflection surfaces into which the edges of the band or sections of band fit The element is then deflected in a clock-wise direction past spray nozzles 331, whereby high pressure sprays impinge on the top and bottom surfaces of the pleated element From the spray compartment the element passes into a bath compartment 333 where the band comes to a stillstand once the element is completely submerged in the bath of liquid The soaking bath is fitted with an ultrasonic device 337 to aid in the dissolving and/or decomposing action of the liquid on the material blocking the pores of the particular medium making up the element According to the invention, depending on the particular application, further spraying, soaking, dewatering, drying, electrostatic charging, etc compartments for regenerating the used elements before their return to the filter chamber for reuse are arranged in series
• The recovery of solids with state-of-the-art apparatus for reverse osmosis, ultra- and micro-filtration is seldom practicable Costly multi-stage separation operations are often carried out when both the recovery of valuable solids and sub-micronic filtration of the liquid phase are required Often large surface areas of filter media are involved in the operations Experience has shown that for such operations, despite the advantages of full automation, the application of the state-of-the-art genre of the present invention is too costly Fig.6/7/8/9 show examples of pleated elements for use with the filter genre of the present invention that increase the available area of filter media in the filter chamber by a factor of up to and in excess of 100 and thereby make the application of the intermittently operating band filter a viable economic proposition over a broad range of not only liquid but also gas processing operations
Fig.6 illustrates schematically an element 620 with spaces 645 for accomodating solid residues formed by pleated media with pressure-resisting filtrate drainage inserts 649 suitable for micronic filtration, e.g. sterile filtration, with high flux and solids' recovery from water, chemicals, beverages, food and gases
Fig.7 shows a preferred execution of the element, whereby the individual folds consist of a thin, outer membranous layer 743 supported by and fixed to a thicker, more pervious layer 747 that when pleated is fitted with the above mentioned drainage inserts and then joined at the base to even more pervious and stronger flat section of filter band 745 provided with a peripheral impervious strip coinciding with the sealing surfaces of the filter lid resp. frame. In this way medium area densities in excess of 50m2/m2 of belt can be accommodated Due to -4- or filtrate quality problems during the production operation is carried out. by microprocessor control.
To carry out preliminary test runs the previously described apparatus consisting of media storage rolls Fig.2, 209, 210 or cassettes 226 are utilized. With a sealed sheet of test medium in the filter chamber a set volume of the turbid liquid to be filtered is dosed to the filter chamber by means of level controller Fig.11, 1106. Compressed gas is then fed through the throttling valve Fig.1/11, 104 while the gas flow at a set pressure is measured by controllers 126, 125, respectively thus giving the specific through-put of filtration. Simultaneously, the quality of the filtrate is monitored by instrumentation 1107. The sheet of test medium is subsequently discharged from the chamber and if necessary further ams are carried out to optimize the choice of medium. Regularly during operation similar test runs are carried out on a programmed basis or on a monitored drop in the production rate or product quality. A non-specification filtrate quality or through-put is then automatically corrected by a more intensive medium regeneration, a change in medium or in extreme cases by switching to an alternative mode of fluid purification, e.g. a precoating technique with filter aids, powdered adsorbents, electrostatically surface-charged beads or as a last resort the above described „one-way" media.
Accessibility:
* According to GB2280857 the filter chamber and band equipment of the band filter are surrounded by a sealing shell Fig.l, 192 provided with lateral windows 163, 164. However, such a shell enclosing the disclosed medium devices of the present invention, Fig.2/3, would present an unacceptable restriction of the accessibilty to the internal parts. Fig.12/13 show an innovative shell arrangement that obviates such a restriction. The shell is divided horizontally into at least 2 pieces 1201, 1202, whereby preferably the peripheral upper surface of the filtrate chamber 1203 is used as a sealing surface for the lower rim of the vertically movable upper lid-shaped part 1201 and the peripheral lower surface of the filtrate chamber is employed as a sealing surface for the rim of the vertically movable trough-shaped part 1202. -5-
the inherent advantage of short cycle times and much thinner cake thicknesses, a im2 band filter of the genre of the present invention will achieve a similar performance to state-of-the-art pressure filters illustrated at Fig.17, Pos.1/2/3 with an estimated filter area of 500m2. This would mean that a im2 filter of the present invention as part of a water treatment plant could supply purified water for the population of a large city Fig.10 shows the principle of the innovative electrostatic filter bed process used in this application, whereby with ca. 5mm beds of regenerable ca. 50 micron surface-charged beads 1004 supported on submicronic pleated elements, sterile water can be produced with compact plant on a large scale. Similar economies accrue for applications in breweries, sugar factories, chemical plants, etc. Fig.8/9 show an innovative filter element 820 consisting of densly packed membranous pleats out of composite material 843/847, whereby the means of filtrate drainage are provided by the support layer 847 and interface 849. With filter medium densities of up to and exceeding 200m2/m2 of band and operating pressures up to 20 bar, difficult micro-, ultra-filtration and reverse osmosis applications can be carried out. with these elements including medium regeneration in fully automatic operation. Fig.16 illustrates an innovative type of element 1601 out of packed material such as glass fibre, beads, etc. as well as regenerable activated material such as activated carbon, bleaching earth, ion exchange material, molecular sieves, zeolites, etc. The wall part of the element 1603 is preferentially fabricated out of some form of elastomer and the roof part 1604 out of woven synthetic monofilament fibre.
Control:
• State-of-the-art filter apparatus, Fig.17, Pos.1-8, lack the possibilty of carrying out test runs immediately before or during filtration operations. Unscheduled interruptions during operation such as rapidly falling through-put or sub-standard product quality inevitably lead to prolonged plant shut-downs in order to rectify the situation.
According to the present invention, such plant shut-downs are avoided in fluid purification operations by means of automatically carrying out short preliminary test runs with standardized „one-way" media on small samples of the fluid to be purified as well as on standard fluids during operation, whereby a programmed choice of the optimal mode of operation and medium for the planned production operation or the correction of through-put -6- In a preferred embodiment* the filtrate chamber is fixed and stationary* whereas* in order to achieve maximum peripheral accessibility, both the upper and lower shell pieces can be raised and lowered vertically by means of actuators in the form of pressure cylinders 1207, 1206.
Cleaning and sterilization:
• The filter cleaning apparatus disclosed in GB 2280857 comprises fixed nozzles surrounding the filter chamber, whereby many internal surfaces of the chamber remain untouched by the sprays. In order to solve the problem of the closed inaccessable filtrate chamber with an overlying section of filter band, the said disclosure suggests that for cleaning the filtrate chamber surfaces* removable band-supporting and filtrate drainage elements are provided which after manual removal leave mainly plane surfaces for cleaning. This manual intervention as well as the necessary manual removal of the filter band would be unacceptable in a fully automated plant.
Fig.14/15, illustrate the innovative solution according to the present invention of improving and automating this crucial operation. It consists essentially of a transportable manifold 1408 lying outside the filter chamber but inside the top shell 1411 during the filtration operation fitted with spray nozzles 1405. In the chamber cleaning operation, an external actuator 1401 pushes the nozzle manifold mounted on rails 1402 into the opened filter chamber* where, on reaching a central position within the chamber, it comes to rest and is connected at one end to an external oscillating actuator 1407 and at the opposite end to an external source of pressurized cleaning fluid 1404. In an alternative transporting method according to the invention* the manifold is transported backwards and forwards inside the interior of the filter chamber by laterally positioned subsidary feed conduits situated on the main manifold and fitted with extra* horizontally orientated nozzles. According to the invention* this arrangement avoids mechanical actuators in that the cleaning and actuating fluid is controlled solely by external valves connected to movable hoses within the upper shell. According to the present invention, in order to expose the complete filtrate chamber to the spray nozzles 1405 without any manual intervention* the filtrate drainage member consists of a pattern of grooves, slits and channels cut into the upper surface 1406 of a plate 1409 leading to one or a plurality of filtrate exit nozzles 1410 an hence to a filtrate receiver not shown, whereby according to the invention, during the cleaning and/or sterilizing operation a

Claims

-7- section of filter band consisting of largely spaced woven mesh or perforated material gives complete access of the sprays to the largely exposed surfaces of the filtrate drainage member.Claims
1. Band filter for liquids and gases with a filtrate chamber 222 on which a filter band 217 is intermittently transported and in the stationary position, with a fresh section of filter medium coinciding with a pervious upper supporting surface 227, a pressure difference is applied between the turbid fluid above the surface of the filter band and the interior of the filtrate chamber, thereby characterized, that the filter band comprises a plurality of sections of medium 201, 202, 203.
2. Band filter according to Claim 1, thereby characterized, that one or a plurality of sections consist of pleated elements 321.
3. Band filter according to Claim 1, thereby characterized, that one or a plurality of sections consist of packed elements 1601.
4. Band filter for liquids and gases with a filtrate chamber 222 on which a filter band 217 is intermittently transported and in the stationary position with a fresh section of filter medium coinciding with a pervious upper supporting surface 227 a pressure differential is applied between the turbid fluid above the surface of the filter band and the interior of the filtrate chamber, thereby characterized, that disposable filter media in the form of storage rolls 209, 210 or stacks of sheet material 226 are positioned as individual sheets supported by the band 217 in sealing position on the filtrate chamber 222 by means of slitting 208 and feeding devices 220, 221, 225, 213, 214.
5. Band filter according to Claim 4, thereby characterized, that sections of the individual medium sheets as well as the band are tested for permeability and filtrate quality by compressed gas pressure and flow control devices 104, 125, 126.
6. Band filter according to Claim 5, thereby characterized, that the filtrate quality is measured and controlled by instrumentation 1106
7. Band filter for liquids and gases with a filtrate chamber 222 on which a filter band 217 is intermittently transported and in the stationary position with a fresh section of filter medium coinciding with a pervious upper supporting surface 227 a pressure differential is applied between the turbid fluid above the surface of the filter band and the interior of the filtrate -8- chamber, thereby characterized, that the filter chamber and band equipment are sealed from the ambient atmosphere by at least two separate shell sections 1201, 1202.
8. Band filter for liquids and gases with a filtrate chamber 222 on which a filter band 217 is intermittently transported and in the stationary position with a fresh section of filter medium coinciding with a pervious upper supporting surface 227 a pressure differential is applied between the turbid fluid above the surface of the filter band and the interior of the filtrate chamber, thereby characterized, that a nozzle-manifold 1408 is transportable across the surface of the filtrate chamber.
WO 99/49950 _q_ PCT/AU98/00213
AMENDED CLAIMS
[received by the International Bureau on 11 June 1999 (11.06.99); new claim 9 added; remaining claims unchanged (1 page)]
9. Process utilizing the apparatus according to Claim 2, thereby characterized, that for the recovery of wastewater or the purification of contaminated liquids the surface of the pleats of medium (312) before or during the filtration/purification operation are coated with surface-charged material (1004).
PCT/AU1998/000213 1998-03-30 1998-03-30 A band filter for liquid and gas purification WO1999049950A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/AU1998/000213 WO1999049950A1 (en) 1998-03-30 1998-03-30 A band filter for liquid and gas purification
AU67119/98A AU6711998A (en) 1998-03-30 1998-03-30 A band filter for liquid and gas purification

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/AU1998/000213 WO1999049950A1 (en) 1998-03-30 1998-03-30 A band filter for liquid and gas purification

Publications (1)

Publication Number Publication Date
WO1999049950A1 true WO1999049950A1 (en) 1999-10-07

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Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE629425C (en) * 1933-11-29 1936-04-30 Adam Opel Akt Ges Storage of the brake carrier disc
AU5917869A (en) * 1968-07-02 1971-02-11 Nv. Philips' Gloeilampenfabrieken Backflushing filter
DE3219898A1 (en) * 1981-06-04 1982-12-30 Société L. Choquenet, 02301 Chauny FILTER DEVICE
FR2519658A1 (en) * 1982-01-14 1983-07-18 Aprochim Srl Filtration appts., esp. for electroplating solns. - where filter strip is periodically fed from spool through filtering chamber so blocked strip can easily be replaced
DE3222989A1 (en) * 1982-06-19 1983-12-22 Grau Feinwerktechnik GmbH & Co, 7926 Böhmenkirch PLATE FILTER
DE3539419A1 (en) * 1985-11-07 1987-05-21 Oliver Schoenauer Filter apparatus
WO1987002908A1 (en) * 1985-11-14 1987-05-21 Hakü Hans Kübler Gmbh Filteranlagen Und Maschinenb Filter press for separating liquids from sludge to obtain a high solid content
EP0462369A1 (en) * 1990-06-19 1991-12-27 Hydac Technology Gmbh Filter
GB2280857A (en) * 1993-05-25 1995-02-15 Peter Anthony Miller Moving band filter

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE629425C (en) * 1933-11-29 1936-04-30 Adam Opel Akt Ges Storage of the brake carrier disc
AU5917869A (en) * 1968-07-02 1971-02-11 Nv. Philips' Gloeilampenfabrieken Backflushing filter
DE3219898A1 (en) * 1981-06-04 1982-12-30 Société L. Choquenet, 02301 Chauny FILTER DEVICE
FR2519658A1 (en) * 1982-01-14 1983-07-18 Aprochim Srl Filtration appts., esp. for electroplating solns. - where filter strip is periodically fed from spool through filtering chamber so blocked strip can easily be replaced
DE3222989A1 (en) * 1982-06-19 1983-12-22 Grau Feinwerktechnik GmbH & Co, 7926 Böhmenkirch PLATE FILTER
DE3539419A1 (en) * 1985-11-07 1987-05-21 Oliver Schoenauer Filter apparatus
WO1987002908A1 (en) * 1985-11-14 1987-05-21 Hakü Hans Kübler Gmbh Filteranlagen Und Maschinenb Filter press for separating liquids from sludge to obtain a high solid content
EP0462369A1 (en) * 1990-06-19 1991-12-27 Hydac Technology Gmbh Filter
GB2280857A (en) * 1993-05-25 1995-02-15 Peter Anthony Miller Moving band filter

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