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WO2017085698A1 - Ensemble de microfiltration et procédé de fabrication associé - Google Patents

Ensemble de microfiltration et procédé de fabrication associé Download PDF

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Publication number
WO2017085698A1
WO2017085698A1 PCT/IB2016/056991 IB2016056991W WO2017085698A1 WO 2017085698 A1 WO2017085698 A1 WO 2017085698A1 IB 2016056991 W IB2016056991 W IB 2016056991W WO 2017085698 A1 WO2017085698 A1 WO 2017085698A1
Authority
WO
WIPO (PCT)
Prior art keywords
collection chamber
edges
elongate
filter
microfiltration
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/IB2016/056991
Other languages
English (en)
Inventor
Laurie BARWELL
Johannes Michiel BREDENKAMP
Visvanathan Lingamurthi PILLAY
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.)
Water Research Commission
Original Assignee
Water Research Commission
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 Water Research Commission filed Critical Water Research Commission
Publication of WO2017085698A1 publication Critical patent/WO2017085698A1/fr
Anticipated expiration legal-status Critical
Priority to ZA2018/04129A priority Critical patent/ZA201804129B/en
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D65/00—Accessories or auxiliary operations, in general, for separation processes or apparatus using semi-permeable membranes
    • B01D65/003—Membrane bonding or sealing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
    • B01D61/14—Ultrafiltration; Microfiltration
    • B01D61/18—Apparatus therefor
    • 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
    • B01D63/10—Spiral-wound membrane modules
    • B01D63/107—Specific properties of the central tube or the permeate channel
    • 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
    • B01D63/14—Pleat-type membrane modules
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D65/00—Accessories or auxiliary operations, in general, for separation processes or apparatus using semi-permeable membranes
    • B01D65/02—Membrane cleaning or sterilisation ; Membrane regeneration
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2313/00—Details relating to membrane modules or apparatus
    • B01D2313/04—Specific sealing means
    • B01D2313/042—Adhesives or glues
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2313/00—Details relating to membrane modules or apparatus
    • B01D2313/06—External membrane module supporting or fixing means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2313/00—Details relating to membrane modules or apparatus
    • B01D2313/12—Specific discharge elements
    • B01D2313/125—Discharge manifolds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2313/00—Details relating to membrane modules or apparatus
    • B01D2313/14—Specific spacers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2313/00—Details relating to membrane modules or apparatus
    • B01D2313/21—Specific headers, end caps
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2315/00—Details relating to the membrane module operation
    • B01D2315/08—Fully permeating type; Dead-end filtration
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2321/00—Details relating to membrane cleaning, regeneration, sterilization or to the prevention of fouling
    • B01D2321/30—Mechanical cleaning, e.g. with brushes or scrapers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
    • B01D61/14—Ultrafiltration; Microfiltration
    • B01D61/147—Microfiltration

Definitions

  • This invention relates to a microfiltration assembly and a method of manufacturing a microfiltration filter and assembly.
  • Filtration involves removing particulate matter from water by forcing water through a porous media.
  • This porous media can be natural, in the case of sand, gravel, and clay or it can me a membrane wall made of various materials.
  • Microfiltration can be used for removal of particulate and macromolecules from raw water to produce potable water. It is a type of physical filtration process where a contaminated fluid is passed through a special pre-sized membrane to separate microorganisms and suspended particles from process liquid. Many microfiltration assemblies and filters are known and an example of such a unit is disclosed in the South African patent application number 2009/07042 entitled "Reverse Flow Microfiltration".
  • microfiltration unit which includes two co-planar flexible woven fibre filtration sheets peripherally connected to define at least one internal collection chamber and a fluid outlet extending from inside the collection chamber to an outside thereof. It further discloses a microfiltration assembly, which includes at least one microfiltration unit and a fluid extraction manifold, the manifold being in fluid flow communication with the fluid outlets of the microfiltration units.
  • the invention of this application provides for a microfiltration filter, an assembly containing such a filter and a method of manufacturing it.
  • the disclosures of this invention are useful in the treatment of water for providing safe drinking water.
  • a microfiltration filter comprising the steps of:
  • an elongate, tubular collection chamber having two substantially parallel planar sides manufactured from woven fibre filtration material and having opposing long edges and opposing open edges;
  • step of providing the elongate, tubular collection chamber to include folding a sheet of woven fibre filtration material onto itself, thereby providing an elongate double sheet of filtration material, forming the two substantially parallel planar sides with aligned edges, the double sheet having open and blind long edges and two short opposing open edges; and for the step of folding the collection chamber to include rolling it into a coil or, alternative, folding it into a zig-zag pattern.
  • Still further features of the invention provide for the method to include the steps of: positioning a spacer between the parallel sides prior to sealing the edges; and securing a substantially rigid end cover to one or both long edges of the folded collection chamber, the end cover defining apertures through which operatively outer surfaces of the collection chamber are accessible.
  • the spacer may be foraminous and may include an antimicrobial agent.
  • Yet further features of the invention provide for the step of sealing open long and short edges of the collection chamber to include securing aligned edges together with overlook stitches and applying a liquid impervious sealing agent over the stitched edges.
  • the invention further provides a microfiltration filter comprising:
  • an elongate, tubular collection chamber having two substantially parallel planar sides manufactured from a woven fibre filtration material and having opposing long edges and opposing short edges;
  • a fluid outlet in at least one of the sides, the fluid outlet being in fluid communication with an interior of the collection manifold, wherein open long and short edges of the collection chamber are sealed to form a liquid impervious seal and the collection chamber is folded across the long edges to create a filter with multiple adjacent layers of the elongate, tubular collection chamber.
  • the elongate, tubular collection chamber to comprise a sheet of flexible woven fibre filtration material folded onto itself to provide and elongate double sheet of filtration material forming the two substantially parallel planar sides with aligned edges, the double sheet having open and blind long edges and two short, opposing open edges; for the collection chamber to be rolled into a coil or, alternative, folded into a zig-zag pattern; for the filter to include a spacer between the folded parallel sides; and for the filter to include one or two substantially rigid end covers secured to one or both long edges of the folded collection chamber, the end covers defining apertures through which operatively outer surfaces of the collection chamber are accessible.
  • Still further features provide for open long and short edges of the collection chamber to be sealed by securing aligned edges together with overlook stitches and applying a liquid impervious sealing agent over the stitched edges.
  • the spacer to include an antimicrobial agent; for the filter to include a stiffening support for supporting the folded collection chamber in an operatively vertical orientation; for the flexible woven fibre filtration material to be manufactured from polyester; and for the sheet of flexible woven fibre filtration material to be selected from the group including: GELVANOR BFP0068 standard flat sheet; GELVANOR BFP0068 tubular flat sheet; GELVANOR BFP0642 Heatset (F04); and GELVANOR BMP7523 Scour/Heatset.
  • a yet further feature provides for the spacer to be foraminous, preferable a mesh manufactured from a resiliently flexible material.
  • microfiltration assembly comprising:
  • liquid receptacle having an open, operatively upper end
  • a permeate outlet in an operatively lower region of the receptacle, wherein the permeate outlet is in fluid communication with the fluid outlet of the microfiltration filter and sealed off from the interior of the receptacle.
  • microfiltration assembly to include a course secondary filter including a mesh held within a collar which is securable over the open end of the receptacle; a lid; a tap secured within a permeate outlet line; a run-off tube secured in the tap nozzle; and a pedestal within which the assembly may be seated during use, thereby increasing the gravitational drop of water being filtered through the assembly.
  • a course secondary filter including a mesh held within a collar which is securable over the open end of the receptacle; a lid; a tap secured within a permeate outlet line; a run-off tube secured in the tap nozzle; and a pedestal within which the assembly may be seated during use, thereby increasing the gravitational drop of water being filtered through the assembly.
  • Figure 1 is an elongate woven fibre material sheet used in a method according to embodiments of the invention
  • Figure 2 is an illustration of a folded woven fibre material sheet of Figure 1 ;
  • Figure 3 is an illustration of the folded woven fibre material sheet of Figures 1 and 2 with a permeate collection manifold positioned therein;
  • Figure 4 is an illustration of the sealed folded elongate woven fibre material of Figure 2 including a permeate discharge nozzle secured in a side thereof;
  • Figure 5 is an illustration of a sealed microfiltration filter of the invention rolled into a spiral configuration;
  • Figure 6 is an illustration of the sealed microfiltration filter of Figure 5 with a substantially rigid end cover secured to the sealed long edge of the folded collection chamber;
  • Figure 7 is an illustration of a microfiltration assembly according to embodiments of the invention.
  • Figure 8 is an illustration of on opened microfiltration assembly of Figure 7;
  • Figure 9 is an illustration of a secondary, rough particulate filter of a reservoir used in an assembly according to an embodiment of the invention.
  • Figure 10 is an illustration of the inside of a microfiltration assembly showing a cleaning brush being introduced to the filter during a cleaning process
  • Figure 1 1 is an illustration of the inside of a microfiltration assembly showing a cleaning brush partially inserted through an aperture in an end cover of the filter during a cleaning process;
  • Figure 12 is an illustration of the inside of a microfiltration assembly showing a cleaning brush entirely inserted through an aperture in an end cover of the filter during a cleaning process;
  • FIG. 13 is an illustration showing an alternative configuration of the filter unit of the invention.
  • Figure 14 is an illustration showing a further alternative configuration of the filter unit of the invention.
  • An embodiment of the invention provides a method of manufacturing a microfiltration filter.
  • the method is described in what follows with reference to Figures 1 to 5.
  • the method comprises folding a sheet of woven fibre filtration material onto itself, thereby providing an elongate double sheet of filtration material having two substantially parallel planar sides with aligned edges.
  • the folded double sheet has open and blind long edges and two short opposing open edges.
  • the method includes positioning an elongate collection manifold between the sides at least partway along and at or near the blind edge, providing a fluid outlet in at least one of the sides wherein the fluid outlet is in fluid communication with an interior of the collection manifold.
  • the method further includes sealing the open long edge and short edges of the double sheet to form a liquid impervious seal and a tubular, elongate collection chamber between the sides, and folding the elongate collection chamber across the long edges to create a filter with multiple adjacent layers of the tubular, elongate collection chamber.
  • An embodiment of the invention illustrated in Figures 7 to 13 provides a microfiltration assembly.
  • the microfiltration assembly comprises a liquid receptacle, having an open operatively upper end, a microfiltration filter as described above secured inside the receptacle, and a permeate outlet, located in an operatively lower region of the receptacle.
  • the permeate outlet is in fluid communication with the fluid outlet of the microfiltration filter and sealed off from the interior of the receptacle.
  • FIG. 1 A microfiltration filter and a method of manufacturing the microfiltration filter is shown with reference to Figures 1 to 6.
  • an elongate sheet of flexible woven fibre filtration material (100) is folded upon itself over one of its long edges (102), until opposing long edges align as shown in Figure 2, thereby defining two substantially parallel filtration sheets (202, 204) forming filtration sides.
  • the material (100) forms a double sheet of filtration material having open (208) and blind (210) long edges and two short opposing open edges (212).
  • a spacer (206) including an antimicrobial agent and manufactured from a resiliently flexible mesh is interposed between the sides (202, 204) as shown in Figure 2.
  • a permeate collection manifold (302) as shown in Figure 3 is positioned between the sides (202, 204) at or near the blind edge (210) and extending substantially the entire length of the edge (210).
  • the manifold (302) includes a plurality of apertures (304) providing access into the manifold and through which liquid may pass and collect and flow inside the manifold.
  • the manifold (302) has an outlet (306) which is secured and sealed around the periphery of a fluid outlet in a side of the filtration material, so as to be in fluid communication with the interior of the manifold.
  • a permeate discharge nozzle (402) is secured in the fluid outlet (306) for discharge of fluid from within the manifold (302).
  • the aligned edges of the open long and short edges of the sides (202, 204) are then secured together by means of an overlooking stitch, after which they are covered with a liquid impermeable sealing agent such as a waterproof glue (404) as shown in more detail in Figure 4.
  • a liquid impermeable sealing agent such as a waterproof glue (404) as shown in more detail in Figure 4.
  • the entire unit is then rolled or folded into a spiral (502) which, when placed on the blind, then operatively lower, edge (210), provides the sealed, long edge (208) at its top and the discharge nozzle (402) at the bottom.
  • a stiffening support may be provided for supporting the tubular, elongate collection chamber in an operatively vertical orientation.
  • the microfiltration filter is at least partially submerged in a feed suspension which is to be filtered. Permeate or clean liquid then moved through the side sheets, leaving the contaminants in the feed suspension. The flow of liquid is from the outside of the sheets into the interior space between the sheets, referred to above as the tubular collection chamber.
  • the mesh or spacer between the two sheets is a grid and biases the two filtration sheets apart, thereby permitting or facilitating the flow of liquid between the sides, through the collection chamber towards and into the collection manifold through the apertures therein.
  • the clean water then collects in the permeate collection manifold from where it can be discharged via the permeate discharge nozzle.
  • the flow of liquid through the filtration sheets into the tubular collection chamber may be facilitated by applying positive pressure to the feed suspension or negative pressure to the interior of the collection chamber or at the discharge nozzle.
  • the filter according to this embodiment of the invention may be particularly suited for use in gravity fed, low-cost filtration assemblies in which a water reservoir including the filter is slightly elevated from ground level.
  • the spirally configured filter unit can be unrolled to clean and rolled back again for subsequent use.
  • the spiral configuration of the tubular collection chamber may be maintained by means of a substantially rigid end cover (602) secured to the sealed long edge (208) of the folded collection chamber.
  • the end cover (602) can be moulded from a resilient or hard plastic material and may define a plurality of apertures or slots (604) through which operatively outer surfaces of the tubular, elongate collection chamber may be accessible.
  • the cleaning functionality provided by the end cover is described in more detail further below. It will also be apparent that the end cover may serve to keep the adjacent sections of the filter spaced apart so that the feed suspension may be exposed to as much surface area of the filter as possible.
  • a gravity-fed microfiltration assembly (700) according to another aspect of the invention is shown in Figures 7 to 12.
  • the assembly (700) as shown from the outside in Figure 7, includes a water reservoir or container (702) with a spiral microfiltration filter as described above secured therein in an upright configuration in which the sealed long edge is positioned at the top and the blind long edge with the collection manifold positioned therein is positioned at the bottom of the reservoir (702).
  • the permeate discharge nozzle of the microfiltration filter protrudes outside the reservoir and a tap (704) with a permeate feed-off tube (706) is connected to the permeate discharge nozzle in the outlet line.
  • the entire assembly (700) has a secondary, large particulate filter cover (708) (as shown in more detail in Figures 8 and 9), which includes a mesh (710) secured within a rim (712) which is securable over an open end of the reservoir (702).
  • the assembly (700) further includes a lid (714) and is elevated off the ground within a three-legged pedestal (716) within which the assembly may be seated during use. It will be appreciated that the pedestal increases the gravitational drop of the water being filtered through the assembly, while placing the reservoir at a convenient height so that a container for filtered water may be placed below the assembly with the feed-off tube (706) placed through an opening in the container.
  • feed suspension is poured through the large particulate filter cover into the reservoir.
  • the large particulate filter cover removes the larger particles from the suspension.
  • the feed suspension then permeates through the side membranes of the coiled filter and clean water collects inside the collection chamber, moves between the side walls to the collection manifold where it collects and can be discharged through the tap and permeate feed-off tube.
  • the permeate nozzle and tap should be completely sealed off from the interior of the reservoir to prevent feed suspension coming into contact with the filtered water and again contaminating it.
  • a cleaning mechanism of the microfiltration filter unit in this embodiment includes a brush (1002) which is used to mechanically clean the external surfaces of the spirally configured filter unit (1004) by extending the brush head through the apertures in the end cover, between external surfaces of the coiled filter and brushing the surfaces with an up-and-down motion. Suitable organic or chemical agents may be used to facilitate cleaning of the filter surfaces.
  • the brush may also include antimicrobials.
  • the flexible woven fibre filtration material used in the manufacture of the filter may be manufactured from polyester.
  • the sheet of flexible woven fibre filtration material may be manufactured from a material selected from: GELVANOR BFP0068 standard flat sheet; GELVANOR BFP0068 tubular flat sheet; GELVANOR BFP0642 Heatset (F04); and GELVANOR BMP7523 Scour/Heatset.
  • planar, tubular collection chamber may be folded in a number of different ways including but not limited to a spiral configuration, a pleated configuration, a zig-zag configuration, or any suitable configuration that ultimately has a large surface area per unit volume as shown in Figures 13 and 14.
  • a microfiltration assembly may be made using any suitable reservoir and the microfiltration filter may be folded to accommodate the shape of such a reservoir.
  • the filter may be mounted within a waterproof bag which may be carried or hung on a tree or placed against a wall instead of on a stand.
  • the waterproof bag adds portability to the product.
  • the reservoir may be replaced with a standard commercially available round plastic tube, which may be more readily available or robust. It is also foreseeable that alternative techniques may be used to seal the open long and short edges of the folded woven fibre filtration material.
  • the construction method of a microfiltration filter as described above holds numerous advantages over other known techniques, in particular it includes fewer seals and is of a simpler construction that other known methods.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Water Supply & Treatment (AREA)
  • Filtering Materials (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)

Abstract

L'invention concerne un filtre de microfiltration, un ensemble comportant ledit filtre, ainsi qu'un procédé de fabrication de ce filtre. Dans un mode de réalisation, le procédé selon l'invention consiste à replier sur elle-même une feuille de matériau filtrant en fibres tissées, ce qui permet d'obtenir une feuille double allongée de matériau filtrant présentant deux côtés plans sensiblement parallèles avec des bords alignés. La feuille double comporte des bords longs ouvert et aveugle et deux bords courts ouverts opposés. Le procédé selon l'invention consiste à placer une rampe de collecte allongée entre les côtés, au moins à mi-chemin le long du bord aveugle et au niveau ou à proximité de ce dernier, à former un orifice de sortie de fluide dans au moins un des côtés, ledit orifice de sortie étant en communication de fluide avec l'intérieur de la rampe de collecte. Le procédé consiste en outre à sceller le bord long ouvert et les bords courts ouverts de la feuille double afin de former un joint étanche au liquide et une chambre de collecte allongée plane entre les côtés, et à plier la chambre de collecte allongée sur les bords longs afin de créer un filtre à couches adjacentes multiples de la chambre de collecte allongée plane.
PCT/IB2016/056991 2015-11-20 2016-11-21 Ensemble de microfiltration et procédé de fabrication associé Ceased WO2017085698A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
ZA2018/04129A ZA201804129B (en) 2015-11-20 2018-06-20 Microfiltration assembly and method of manufacture

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ZA201508575 2015-11-20
ZA2015/08575 2015-11-20

Publications (1)

Publication Number Publication Date
WO2017085698A1 true WO2017085698A1 (fr) 2017-05-26

Family

ID=57680429

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2016/056991 Ceased WO2017085698A1 (fr) 2015-11-20 2016-11-21 Ensemble de microfiltration et procédé de fabrication associé

Country Status (2)

Country Link
WO (1) WO2017085698A1 (fr)
ZA (1) ZA201804129B (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0088459A2 (fr) * 1982-03-04 1983-09-14 Shell Internationale Researchmaatschappij B.V. Appareil de transfert de masse
US6432310B1 (en) * 1999-01-22 2002-08-13 Nitto Denko Corporation Methods of running and washing spiral wound membrane module
WO2010024291A1 (fr) * 2008-08-29 2010-03-04 富士フイルム株式会社 Module de dégazage à films
WO2010036374A1 (fr) * 2008-09-29 2010-04-01 Yaeger Scott P Filtre à écoulement transversal enroulé en spirale
US20120267314A1 (en) * 2011-04-20 2012-10-25 Environmental Safety Products Limited Gravity powered liquid purification system and method
US20150171445A1 (en) * 2012-08-30 2015-06-18 Mann+Hummel Gmbh Humidification Device, in Particular for a Fuel Cell

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0088459A2 (fr) * 1982-03-04 1983-09-14 Shell Internationale Researchmaatschappij B.V. Appareil de transfert de masse
US6432310B1 (en) * 1999-01-22 2002-08-13 Nitto Denko Corporation Methods of running and washing spiral wound membrane module
WO2010024291A1 (fr) * 2008-08-29 2010-03-04 富士フイルム株式会社 Module de dégazage à films
WO2010036374A1 (fr) * 2008-09-29 2010-04-01 Yaeger Scott P Filtre à écoulement transversal enroulé en spirale
US20120267314A1 (en) * 2011-04-20 2012-10-25 Environmental Safety Products Limited Gravity powered liquid purification system and method
US20150171445A1 (en) * 2012-08-30 2015-06-18 Mann+Hummel Gmbh Humidification Device, in Particular for a Fuel Cell

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Publication number Publication date
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