WO2002074424A1 - Appareil pour filtrer un liquide - Google Patents

Appareil pour filtrer un liquide Download PDF

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Publication number
WO2002074424A1
WO2002074424A1 PCT/GB2002/001365 GB0201365W WO02074424A1 WO 2002074424 A1 WO2002074424 A1 WO 2002074424A1 GB 0201365 W GB0201365 W GB 0201365W WO 02074424 A1 WO02074424 A1 WO 02074424A1
Authority
WO
WIPO (PCT)
Prior art keywords
liquid
membranes
filter
filtering
membrane
Prior art date
Application number
PCT/GB2002/001365
Other languages
English (en)
Inventor
Alisdair Donn
Original Assignee
Itt Manufacturing Enterprises, 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 Itt Manufacturing Enterprises, Inc. filed Critical Itt Manufacturing Enterprises, Inc.
Publication of WO2002074424A1 publication Critical patent/WO2002074424A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D63/00—Apparatus in general for separation processes using semi-permeable membranes
    • B01D63/08—Flat membrane modules
    • B01D63/082—Flat membrane modules comprising a stack of flat membranes
    • B01D63/0822—Plate-and-frame devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D63/00—Apparatus in general for separation processes using semi-permeable membranes
    • B01D63/08—Flat membrane modules
    • B01D63/082—Flat membrane modules comprising a stack of flat membranes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D63/00—Apparatus in general for separation processes using semi-permeable membranes
    • B01D63/06—Tubular membrane modules
    • B01D63/066—Tubular membrane modules with a porous block having membrane coated passages
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D63/00—Apparatus in general for separation processes using semi-permeable membranes
    • B01D63/08—Flat membrane modules
    • B01D63/082—Flat membrane modules comprising a stack of flat membranes
    • B01D63/0821—Membrane plate arrangements for submerged operation

Definitions

  • This invention relates to apparatus for filtering a liquid, a filter including said apparatus and a method for filtering a liquid.
  • Filter apparatus for filtering liquids such as waste water and potable water using porous materials in the form of fibres.
  • Such fibres can be assembled into filter elements.
  • raw water is passed into a vessel containing a number of such filter elements, the water passing through the fibre walls into the lumens leaving impurities at the surface under the action of a negative pressure applied to the fibre lumens.
  • a gas is bubbled over the surface of the fibres to dislodge impurities to prevent clogging.
  • problems exist with such devices, such as for example, fibres can become damaged by the gas bubbles, leading to a failure in the integrity of the system.
  • apparatus for filtering a liquid comprising a filter membrane mounted in a support for disposal in a vessel of liquid, the filter membrane comprising a continuous porous material and defining a plurality of conduits for liquid flow from the vessel, the conduits being in fluid communication with the interior of the vessel via the porous material only.
  • a continuous filter membrane comprising a porous material and defining a plurality of conduits for liquid flow from the vessel helps overcome the problem of fibre failure, and mounting the filter in a support makes it flexible to configure.
  • the spacer means may comprise a block or strip adapted for mounting between each membrane, each block or strip being dimensioned to be under compression when in situ between membranes.
  • the spacer means may comprise a tube, which may be of circular section.
  • the spacer means may be under tension when in situ between the membranes, and the apparatus may include fixing means for fixing the spacer, the fixing means comprising grooves between which the spacer means are strung.
  • liquid collection means is provided for collection of liquid from the conduits.
  • the liquid collection means may comprise a chamber defined by the support and a material in which the or each membrane is mounted.
  • the mounting means preferably comprises a settable material, such as epoxy resin.
  • the apparatus comprises connection means for connection of the apparatus to one or more like apparatus for flow of filtered liquid therebetween.
  • a filter for filtering liquid comprising a plurality of apparatus as hereinabove defined.
  • a method of filtering a liquid comprising the use of apparatus or a filter as hereinabove defined.
  • Figure 1 is a front view of apparatus according to the invention
  • Figure 2 is a plan view of the apparatus of Figure 1;
  • Figure 3 is a side view of the apparatus of Figure 1;
  • Figure 3 a is a perspective view of a membrane for use in the apparatus according to the invention.
  • Figure 4 is a side view of a part of a frame for mounting the apparatus of Figure 1;
  • Figure 5 is a part sectional view of the apparatus of Figure 1;
  • Figure 6 is a part sectional view through plane B-B;
  • Figure 7 is a plan view of a part of the apparatus of Figure 5;
  • Figures 8 and 9 are plan views of 2 suitable seals
  • Figure 10 is a sectional view through plane C-C with the apparatus in a first configuration
  • Figure 11 is a sectional view through plane C-C with the apparatus in a second configuration
  • Figure 12 is a sectional view of a spacer
  • Figure 13 is a sectional view of the spacer of Figure 12 in situ
  • Figure 14 is a sectional view of a plurality of spacers in situ
  • Figure 15 is a sectional view of an alternative form of spacer
  • Figure 16 is a sectional view of the spacer of Figure 15 in situ
  • Figure 17 is a sectional view of a plurality of spacers of Figure 15 in situ;
  • Figure 18 is a front view of filter apparatus according to the invention.
  • Figure 19 is a perspective view of an alternative embodiment of apparatus according to the invention.
  • Figure 20 is a part perspective view of a spacer for use with apparatus of Figure 19.
  • apparatus 1 for filtering a liquid comprising a filter membrane 2 mounted in a support 3 for disposal in a vessel of liquid, the filter membrane 2 comprising a continuous porous material defining a plurality of conduits 5 for liquid flow from the vessel, the conduits 5 being in fluid, communication with the interior of the vessel via the porous material only.
  • FIG. 1 illustrates the apparatus 1 which comprises filter membranes 2 mounted parallel to one another in support 3.
  • Each membrane 2 consists of a flat plate or sheet of a thermoplastic polymeric material which is microporous.
  • Each sheet includes a plurality of conduits 5, each conduit being a continuous channel running through the material from one edge of the sheet to another, the conduits 5 being substantially parallel and equally spaced.
  • a convenient method of membrane formation is by extruding and precipitating in a controlled manner the required polymeric material which could for example be formed from a mixture of polyether sulphone, n-methyl pyrolidone and polyvinyl pyrolidone.
  • the surface 6 of each sheet is in fluid communication with the interior of the conduits 5 through the pores of the porous material.
  • the filter membranes 2 are fixed in place in a support 3 such that the conduits 5 run from side to side in the apparatus as viewed.
  • the ends of the conduits are potted in epoxy resin which is also used to fix the membranes to the support 3 as shown at reference numeral 7.
  • the ends of each membrane 2 are machined and are left exposed so that the conduits 5 remain open, opening onto chambers 8 which are in fluid communication with filtrate pipes 9 at either end.
  • different numbers of filter membranes 2 can be accommodated by the use of assemblies of filter membranes 2 in which the membranes 2 are differently spaced so that the apparatus can be modified to treat waste or pure waters.
  • the support 3 comprises a frame into which, as already stated, the membranes 2 are fixed.
  • the frame consists of two side assemblies 10 of identical configuration and front and back assemblies 11.
  • the side assemblies and front and back assemblies fit together by a bonded joint at joints 12.
  • each membrane sheet 2 is separated from its neighbour or neighbours by spacers 13.
  • each spacer 13 consists of a strip of a relatively soft, resilient deformable and inert material such as rubber.
  • Figure 12 illustrates a transverse section through such a strip from which it can be seen that each strip has two major surfaces 14 and two minor surfaces 15, each major surface being arcuate.
  • a slit 16 bisects each minor surface.
  • the spacers 13 are dimensioned such that when in place between two membranes 2 the major surfaces 14 are compressed, movement of the resiliently deformable material being accommodated by the slits 16.
  • the spacers 13 keep the membrane sheets 2 apart and minimise stress on the membranes where they contact the spacers and at their mounting points in the support 3.
  • a wider spacing of membrane sheets 2 can be achieved using the spacers illustrated in Figures 15 to 17.
  • the conduits 5 of the membranes 2 feed into chambers 8, one at each side of the apparatus 1.
  • Each chamber 8 has a filtrate pipe 9 at its top and bottom (as viewed).
  • the filtrate pipes 9 can be connected to apparatus downstream to which the filtered water is to be fed.
  • the apparatus 1 is designed so that a number of modules can be connected via filtrate pipes 9 and mounted within an outer frame 18 to increase the capacity of filtration. This is illustrated in Figure 18.
  • FIG 19 illustrates a further embodiment of apparatus according to the invention in which the form of the spacer 13 has been varied.
  • each spacer 13 takes the form of a resiliently deformable tube ideally made from a soft flexible material such as rubber, as illustrated in detail in Figure 20.
  • the tube may be of circular or non- circular cross-section and may be formed by extrusion.
  • each membrane sheet 2 is separated from its neighbour by a plurality of such spacers 2 which extend transversely across the membranes 2 and are retained in fixings 19.
  • Each fixing 19 comprises an elongate T-section body.
  • the fixings 19 are used in pairs, attached opposite one another to the front and back assemblies 11 (only one shown for clarity), such that the elongate head 20 of each "T" is parallel with the direction of the conduits 5 of the membranes 2, forming a partial side wall thereto, with the leg 21 being perpendicular to the membranes 2 and extending inwardly towards them.
  • the length of the fixings 19 is varied according to the number of membranes 2 to be accommodated and also their spacing.
  • the elongate head 20 of each fixing 19 is provided with a number of U-shaped grooves or notches 22 extending inwardly from each edge thereof towards the leg. The grooves 22 on one edge are offset from the grooves on the other edge.
  • a spacer 13 is attached by feeding a portion adjacent one end into a groove 22, drawing it under tension across the membranes 2 and feeding it into a corresponding groove on the opposing fixing 19.
  • the spacer 13 is dimensioned such that it must be compressed in order for it to fit into the grooves 22.
  • the spacer 13 is locked in place by feeding each free end into a free off-set groove 22 on the other edge of the fixing 19.
  • the spacer 13 is securely fixed under tension and forms an effective shock and movement absorber between the membranes 2.
  • the same, or a similar fixing system can be used with the spacers 13 described in the previous embodiment.
  • the apparatus 1 In use, the apparatus 1 according to the invention is placed into a tank of liquid to be treated, such as waste water.
  • the membranes 2 are fully immersed in the liquid, but water cannot enter the chambers 8 because the filtrate pipes 9 are connected to tubes (not shown) for removal of filtered water. Suction is applied to these tubes which causes water from the tank to pass through the pores of the membrane sheets 2 into the conduits 5 and thence into the chambers 8 for removal via filtrate pipes 9.
  • an aeration device may be provided in the tank to bubble a stream of gas over the surfaces of the membranes 2 to dislodge any accumulated solids.
  • two or more modules of apparatus 1 can be connected via filtrate pipes 9 and mounted in outer frame 18. The whole assembly is then placed into a tank operated as described. The apparatus may also be backwashed by reversal of flow of the filtrate for short periods.
  • modules, tank and associated equipment such as filtrate/backwash pumps and aeration devices constitutes the core of a system which can be used in a wide range of water treatment processes over a wide range of suspended solids.

Landscapes

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

Abstract

La présente invention concerne un appareil (1) pour filtrer un liquide. Cet appareil comprend une membrane de filtration (2), qui est montée dans un support (3) à placer dans une cuve de liquide. Ladite membrane de filtration (2) est constituée d'un matériau poreux continu, qui définit plusieurs conduites (5) destinées au liquide s'écoulant de la cuve, lesdites conduites (5) étant en communication fluidique avec l'intérieur de la cuve uniquement par l'intermédiaire dudit matériau poreux.
PCT/GB2002/001365 2001-03-21 2002-03-21 Appareil pour filtrer un liquide WO2002074424A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GBGB0107100.0A GB0107100D0 (en) 2001-03-21 2001-03-21 Apparatus for filtering a liquid
GB0107100.0 2001-03-21

Publications (1)

Publication Number Publication Date
WO2002074424A1 true WO2002074424A1 (fr) 2002-09-26

Family

ID=9911268

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB2002/001365 WO2002074424A1 (fr) 2001-03-21 2002-03-21 Appareil pour filtrer un liquide

Country Status (2)

Country Link
GB (1) GB0107100D0 (fr)
WO (1) WO2002074424A1 (fr)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5551405A (en) * 1978-09-26 1980-04-15 Daicel Chem Ind Ltd Flat semipermeable membrane module
JPH0731857A (ja) * 1993-07-23 1995-02-03 Nitto Denko Corp 平膜構造体
JPH07100339A (ja) * 1993-10-06 1995-04-18 Nitto Denko Corp 槽浸漬式平膜エレメント
JPH07100340A (ja) * 1993-10-06 1995-04-18 Nitto Denko Corp 膜分離装置
EP0662341A1 (fr) * 1994-01-07 1995-07-12 Kubota Corporation Module à membranes filtrantes
US5804280A (en) * 1993-03-24 1998-09-08 Pall Corporation Composite structure having a porous filter medium and a method for forming same
JP2000246018A (ja) * 1999-03-03 2000-09-12 Daicel Chem Ind Ltd 平膜エレメント

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5551405A (en) * 1978-09-26 1980-04-15 Daicel Chem Ind Ltd Flat semipermeable membrane module
US5804280A (en) * 1993-03-24 1998-09-08 Pall Corporation Composite structure having a porous filter medium and a method for forming same
JPH0731857A (ja) * 1993-07-23 1995-02-03 Nitto Denko Corp 平膜構造体
JPH07100339A (ja) * 1993-10-06 1995-04-18 Nitto Denko Corp 槽浸漬式平膜エレメント
JPH07100340A (ja) * 1993-10-06 1995-04-18 Nitto Denko Corp 膜分離装置
EP0662341A1 (fr) * 1994-01-07 1995-07-12 Kubota Corporation Module à membranes filtrantes
JP2000246018A (ja) * 1999-03-03 2000-09-12 Daicel Chem Ind Ltd 平膜エレメント

Non-Patent Citations (5)

* Cited by examiner, † Cited by third party
Title
DATABASE WPI Week 199515, Derwent World Patents Index; AN 1995-109687, XP002202911 *
DATABASE WPI Week 199524, Derwent World Patents Index; AN 1995-182198, XP002202910 *
PATENT ABSTRACTS OF JAPAN vol. 0040, no. 89 (C - 016) 25 June 1980 (1980-06-25) *
PATENT ABSTRACTS OF JAPAN vol. 1995, no. 07 31 August 1995 (1995-08-31) *
PATENT ABSTRACTS OF JAPAN vol. 2000, no. 12 3 January 2001 (2001-01-03) *

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Publication number Publication date
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