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WO2013079392A1 - Unité filtrante stable à basse température et sa fabrication - Google Patents

Unité filtrante stable à basse température et sa fabrication Download PDF

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Publication number
WO2013079392A1
WO2013079392A1 PCT/EP2012/073356 EP2012073356W WO2013079392A1 WO 2013079392 A1 WO2013079392 A1 WO 2013079392A1 EP 2012073356 W EP2012073356 W EP 2012073356W WO 2013079392 A1 WO2013079392 A1 WO 2013079392A1
Authority
WO
WIPO (PCT)
Prior art keywords
filter membranes
ceramic
plastic part
filtration unit
reinforcement
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/EP2012/073356
Other languages
German (de)
English (en)
Inventor
Gerd Schlick
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.)
Itn Nanovation AG
Original Assignee
Itn Nanovation AG
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 Itn Nanovation AG filed Critical Itn Nanovation AG
Priority to AU2012344068A priority Critical patent/AU2012344068A1/en
Priority to EP12791470.3A priority patent/EP2785441A1/fr
Publication of WO2013079392A1 publication Critical patent/WO2013079392A1/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
    • B01D65/00—Accessories or auxiliary operations, in general, for separation processes or apparatus using semi-permeable 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
    • B01D63/08—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
    • B01D2313/00—Details relating to membrane modules or apparatus
    • B01D2313/21—Specific headers, end caps

Definitions

  • the present invention relates to a process for producing a filtration unit, which is particularly suitable for water treatment.
  • the filtration unit comprises at least two ceramic filter membranes and a holder for the filter membranes.
  • Conventional wastewater treatment plants usually contain a settling tank, in which coarse constituents are removed from the wastewater, an aeration tank and a secondary clarifier.
  • aeration tank microorganisms are used to decompose the organic substances contained in the waste water.
  • secondary clarifier these microorganisms are usually separated from the wastewater again by sedimentation and, if appropriate, at least partially recycled to the activated sludge tank.
  • a complete separation of the microorganisms, in particular by sedimentation usually not possible, so that they can get into the environment with the wastewater. For this reason, the purified wastewater originating from the activated sludge tank is further treated with filtration units in order to reliably separate off existing microorganisms.
  • filtration filters for filtration units in the field of microfiltration have hitherto usually been used, as are known, for example, from EP-A1-602560, WO-A-03/037489 or WO-A-04/091755
  • filtration units with ceramic-based filters have increasingly proliferated. Applicant-developed filtration units with ceramic-based filter membranes are described in WO 2010/015374 A1.
  • ceramic filter membranes are, on the one hand, due to their surface, which is more irregular compared to polymer filter membranes, due to the burning of the extruded ceramic blanks caused, and on the other hand because of their brittleness in the processing.
  • the provision of an adequate liquid and pressure-tight mount for the corresponding ceramic filter membranes has often been difficult.
  • the filtration units should also be usable at very low temperatures, preferably below 5 ° C., without causing the mentioned defects.
  • the filter unit according to the invention comprises at least two ceramic filter membranes and a holder for the at least two ceramic filter membranes.
  • the ceramic filter membranes are plate-shaped. They each have a filter-active outside and at least one internal discharge channel for filtered water.
  • Preferably used filter membranes have internal discharge channels with outlet openings which lie on at least one narrow side, preferably on two opposite narrow sides, of the ceramic filter membranes.
  • Suitable filter membranes for a filtration unit according to the invention are known from the prior art. In this context, reference should be made in particular to the ceramic flat membranes described in WO-A-07/128565, WO-A-07/093440 and WO-A-07/093441.
  • a filter unit according to the invention preferably has between 2 and 40 filter membranes.
  • the holder comprises a first and a second plastic part, which together form a hollow body with an internal collecting space, in which the water emerging from the discharge channels can be collected and discharged via the water emerging from the discharge channels.
  • the holder is formed in two parts, so is composed exclusively of the two plastic parts.
  • the first plastic part is particularly preferably formed in one piece, analogously to, for example, the plastic casting 102 shown in FIG. 1 of WO 2010/015374 A1. As a rule, it exhibits (also in analogy to the plastic casting illustrated in FIG. 1 of WO 2010/015374 A1 102) has a breakthrough for each of the ceramic fiber membranes.
  • the breakthroughs serve as receptacles for the filter membranes, which are fixed therein in such a way that the internal discharge channels are in communicating connection with the collecting space.
  • the discharge channels open directly into the collecting space.
  • the collecting space is formed by the plastic material I 102 in conjunction with the plexiglass disk 105. If, however, such a filtration unit is cooled to a temperature below 5 ° C., cracks may form in the ceramic filter membranes as well as in the casting compound hardened by the filter membranes. The occurring at these temperatures thermo-mechanical stresses are too large due to the different physical properties of Polymerverguss and ceramic.
  • a remedy for this problem could be created in a surprisingly simple manner, namely by a reinforcement, in particular a metallic or ceramic reinforcement is incorporated into the second plastic part, which is to form the mentioned hollow body together with the first plastic part.
  • the frame 103 contracts in all three spatial directions during cooling, but not uniformly, since the ceramic filter membranes 101 act as a reinforcement on the side of the frame facing away from the plexiglass pane 105. As a result, a trapezoidal deformation of the frame may occur, possibly with drastic consequences. For example, a plurality of filter units stacked on top of one another can no longer readily be coupled to one another via the openings 106 in the frame 103, as described in the description of the figures relating to FIG.
  • the reinforcement can be threads, rods, tubes, rings, nets, grids or plates made of a material such as metal or ceramic.
  • the reinforcement is particularly preferably fibers, mats, rods, tubes, rings, strips or plates made of a ceramic or of a glass ceramic.
  • Particularly preferred are simple ceramic tiles are used, as they are available in basically every hardware store, but ideally without a pore-occlusive glaze.
  • tiles are used whose surface has been roughened, for example by sandblasting, or which is structured in three dimensions.
  • the first and second plastic parts are made of the same material.
  • the plastic parts are made by casting or injection molding of a liquid polymer composition or of a liquid prepolymer such as an epoxy or a polyurethane resin.
  • the at least two ceramic filter membranes in the receptacles of the first plastic part are preferably without auxiliary and connecting means, ie in particular without sealants or adhesives.
  • the ceramic filter membranes are defined in the receptacles without a gasket and without the use of a separate adhesive. Rather, the filter membranes are usually so accurate in the recordings that a seal is not required.
  • the dimensions of the filter membranes correspond essentially exactly to the dimensions of the recordings in which they are fixed. In the present case, this can also be achieved, in particular, by producing the first plastic part "in direct contact" with the at least two ceramic filter membranes by casting or injection molding. In other words, the ceramic filter membranes are cast into the first plastic part.
  • the at least two filter membranes of the filtration unit according to the invention are arranged parallel to one another in preferred embodiments. It is further preferred that the distance between a plurality of mutually parallel filter membranes is always the same.
  • the first plastic part is preferably designed such that it has a frame with preferably rectangular or square cross-section and within the frame at least one transverse web, preferably a plurality of mutually parallel transverse webs.
  • the spaces between the frame and the at least one transverse web and / or between adjacent transverse webs form the openings or receptacles in which the ceramic filter membranes are fixed.
  • the narrow sides of the above-mentioned preferred filter membranes, on which the outlet openings of the inner discharge channels are located are particularly preferred, that is to say completely defined, that is to say over their entire length, in the receptacles.
  • transverse web or webs are otherwise preferably arranged parallel to two opposite sides, in particular to the longitudinal or the transverse sides of a frame with preferably rectangular or square cross-section, so that they can give the frame in a spatial direction a particularly high mechanical stability ,
  • the frame of the first plastic part of a filtration units according to the invention namely at least one, preferably two or more, openings through which filtered water can be removed from the collecting space.
  • These openings are preferably in the stabilized sides of the frame, ie in the sides where the transverse webs abut.
  • one of the stabilized sides has one or two of these openings, the opposite second stabilized side likewise one or two.
  • the openings in the frame are preferably arranged in such a way that a plurality of filtration units according to the invention can be stacked on top of each other, wherein in each case one opening in the context of an attached filtration unit can come to rest exactly on a corresponding opening in the context of the underlying or above filtration unit.
  • the collecting spaces in the holders of the individual stacked filtration units are connected to one another in a corresponding manner, resulting in a channel leading through the holders of all coupled filtration units for discharging filtered medium or cleaning medium for backwashing.
  • the channel is completely within the brackets, an external piping of the individual filtration units is therefore not required.
  • Such a coupling of filtration units has already been mentioned above in connection with the discussion concerning the filtration unit shown in FIG. 1 of WO 2010/015374 A1.
  • the collecting space formed in the interior of the holder is limited to the outside by the aforementioned frame of the first plastic part, the narrow sides of the mentioned filter membranes with the outlet openings, the mentioned transverse webs and of course by the second plastic part.
  • a filtration unit according to the present invention may, for example, comprise a reinforced cover plate, which, like the above-described Plexiglas disk 105 can be inserted into the frame of the first plastic part and which closes the collecting space to one side.
  • a reinforced lid part which has the same outer dimensions as the frame and can be placed on this, are used.
  • a filtration unit according to the invention has more than one holder in which the ceramic filter membranes are fixed. Particularly preferred are embodiments in which opposite narrow sides of substantially rectangular or square filter membranes are fixed in each case a holder.
  • the brackets are preferably functionally identical to each other, so each have the same technical characteristics.
  • the filter unit according to the invention comprises two functionally identical holders of the type described above, between which the at least two ceramic filter membranes are located, each with internal discharge channels for filtered water and outlet openings on opposite narrow sides of the filter membranes, wherein the filter membranes with these narrow sides are defined in each case at least two shots of the two brackets.
  • the filtered water can thus be discharged at both ends of the ceramic filter membranes (on the two opposite narrow sides) via a collecting space of a correspondingly arranged holder.
  • the inventive method for producing a filtration unit is preferably characterized by the following steps:
  • a first step at least two ceramic filter membranes are arranged within a mold and made by casting or injection molding from a liquid polymer mass or from a liquid Prepolymer a first, preferably one-piece plastic part is made, in which the ceramic filter membranes are cast.
  • the liquid polymer mass or the liquid prepolymer can cure in this way directly in contact with the filter membranes in contact and adapt to the contours of the filter membranes exactly. This makes it possible to match the dimensions of the images exactly to the dimensions of the filter membranes, so that no sealant is required. Details on this step can be found in WO 2010/015374 A1.
  • a second plastic part which is preferably the mentioned cover plate is made, in which a preferably metallic or ceramic reinforcement (as described above) is embedded.
  • a reinforcement is placed within a mold which is filled with a liquid polymer mass or liquid prepolymer. By pouring over the reinforcement, this is no longer visible from the outside.
  • preferably identical polymer compositions or prepolymers are used as in the production of the first plastic component.
  • first and the second plastic part are joined together so that they form a hollow body with an internal collecting space.
  • the third step may include an annealing step in preferred embodiments. This variant is particularly preferred when the first and the second plastic part to be connected to each other without mechanical aids or adhesives.
  • the plastic parts resulting from the first and the second step are preferably joined together and tempered in an annealing chamber for a period of 1 day to 1 week at a temperature between 30 ° C and 65 ° C.
  • an annealing chamber for a period of 1 day to 1 week at a temperature between 30 ° C and 65 ° C.
  • a particularly preferred Embodiment is annealed for 2 days at 40 ° C and then for 2 days at 60 ° C. This heat treatment is used in particular to reduce stresses within the first and second plastic part, possibly also their complete curing.
  • FIG. 1 illustrates the production of a reinforced plastic cover plate 104 serving as the second plastic part.
  • the ceramic plates 102 are inserted into the plastic part 101 and then overmolded with a curable polymer mass 103. From the same polymer composition, the plastic part 101 is made. Before inserting the ceramic plates 102, the receptacle provided for the plates can be coated with a layer of the polymer mass 103.
  • FIG. 2 illustrates the further processing of a cover plate 104 produced according to FIG. 1 to form a filtration unit 207 according to the invention.
  • FIG. 2 a shows a module comprising the frame 201 and the transverse webs 202 as the first plastic part and the filter membranes 203. An alternative illustration of the module can be found in FIG. 2b.
  • the transverse webs 202 stiffen the frame 201.
  • the frame 201 together with the transverse webs 202 are manufactured from the same polymer mass as the cover plate 104.
  • the frame 201 has a step 208, in which the armored cover plate 104 can be sunk.
  • a permanent connection between the frame 201 and the cover plate 104 can be made for example by gluing.
  • the two plastic parts form a holder for the filter membranes 203, which has an internal collecting space for filtrate.
  • the collecting space is limited by the cover plate 104, the frame 201, the transverse webs 203 and the filter membranes 203, one narrow side of which is received in the spaces between the transverse webs 202.
  • Another narrow side is defined in a second holder 206. Filtrate from the plenum can be removed via the openings 204a and 204b.

Landscapes

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

Abstract

L'invention concerne une unité filtrante comprenant au moins deux membranes filtrantes en céramique ainsi qu'un support pour les membranes filtrantes. Ces dernières sont conçues en forme de plaques et présentent respectivement une face extérieure activement filtrante ainsi qu'au moins un canal d'évacuation intérieur pour l'eau filtrée. Le support est formé d'une première et d'une deuxième (104) partie en matière plastique qui forment assemblées un corps creux comportant une chambre collectrice intérieure par l'intermédiaire de laquelle l'eau sortant des canaux d'évacuation est évacuée. La première partie en matière plastique est d'un seul tenant et présente un ajour pour chacune des membranes filtrantes en céramique qui y sont fixées de telle manière que les canaux d'évacuation intérieurs soient en liaison de communication avec la chambre collectrice, débouchent de préférence directement dans la chambre collectrice, et une armature (102), de préférence en métal ou en céramique, est incorporée dans la deuxième partie en matière plastique. L'invention concerne également un procédé de fabrication d'une telle unité filtrante.
PCT/EP2012/073356 2011-11-29 2012-11-22 Unité filtrante stable à basse température et sa fabrication Ceased WO2013079392A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AU2012344068A AU2012344068A1 (en) 2011-11-29 2012-11-22 Low-temperature-stable filtration unit and the production thereof
EP12791470.3A EP2785441A1 (fr) 2011-11-29 2012-11-22 Unité filtrante stable à basse température et sa fabrication

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102011087338.4 2011-11-29
DE102011087338A DE102011087338A1 (de) 2011-11-29 2011-11-29 Tieftemperaturstabile Filtriereinheit und ihre Herstellung

Publications (1)

Publication Number Publication Date
WO2013079392A1 true WO2013079392A1 (fr) 2013-06-06

Family

ID=47227793

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2012/073356 Ceased WO2013079392A1 (fr) 2011-11-29 2012-11-22 Unité filtrante stable à basse température et sa fabrication

Country Status (4)

Country Link
EP (1) EP2785441A1 (fr)
AU (1) AU2012344068A1 (fr)
DE (1) DE102011087338A1 (fr)
WO (1) WO2013079392A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105169946A (zh) * 2015-07-30 2015-12-23 澳水魔方（北京）环保科技有限公司 中空板式陶瓷膜的过滤系统
CN109316797A (zh) * 2018-12-03 2019-02-12 浙江联池水务设备股份有限公司 一种可拆钢模整体浇筑滤板
US10427105B2 (en) 2014-09-15 2019-10-01 Nanostone Water Inc. Filter device

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5149430A (en) * 1990-11-20 1992-09-22 Seitz-Filter-Werke Gmbh Und Co. Fluid distributing head for a membrane filter module for filtration of fluids
EP0602560A1 (fr) 1992-12-16 1994-06-22 Kubota Corporation Cartouche à membrane filtrante
JP2002346343A (ja) * 2001-05-22 2002-12-03 Mitsubishi Rayon Co Ltd 集水ヘッダー及び膜モジュールユニット
WO2003037489A1 (fr) 2001-10-24 2003-05-08 A3 Abfall-Abwasser-Anlagentechnik Gmbh Module de filtration a elements plats
WO2004091755A1 (fr) 2003-04-16 2004-10-28 A3 Abfall-Abwasser-Anlagen- Technik Gmbh Module de filtrage a plaques
EP1473074A1 (fr) * 2002-02-07 2004-11-03 Mitsubishi Rayon Co., Ltd. Collecteur de captation et module a membrane
US20040244954A1 (en) * 2003-06-05 2004-12-09 Tetsuya Goto Heat exchanger
WO2007093440A1 (fr) 2006-02-17 2007-08-23 Itn Nanovation Ag Procédé d'épuration d'eaux usées
WO2007128565A2 (fr) 2006-05-08 2007-11-15 Itn Nanovation Ag Unité de filtre immergé pour le traitement des eaux usées et l'obtention d'eau potable
WO2010015374A1 (fr) 2008-08-04 2010-02-11 Itn Nanovation Ag Unité filtrante destinée au traitement de l’eau et d’autres milieux liquides

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5149430A (en) * 1990-11-20 1992-09-22 Seitz-Filter-Werke Gmbh Und Co. Fluid distributing head for a membrane filter module for filtration of fluids
EP0602560A1 (fr) 1992-12-16 1994-06-22 Kubota Corporation Cartouche à membrane filtrante
JP2002346343A (ja) * 2001-05-22 2002-12-03 Mitsubishi Rayon Co Ltd 集水ヘッダー及び膜モジュールユニット
WO2003037489A1 (fr) 2001-10-24 2003-05-08 A3 Abfall-Abwasser-Anlagentechnik Gmbh Module de filtration a elements plats
EP1473074A1 (fr) * 2002-02-07 2004-11-03 Mitsubishi Rayon Co., Ltd. Collecteur de captation et module a membrane
WO2004091755A1 (fr) 2003-04-16 2004-10-28 A3 Abfall-Abwasser-Anlagen- Technik Gmbh Module de filtrage a plaques
US20040244954A1 (en) * 2003-06-05 2004-12-09 Tetsuya Goto Heat exchanger
WO2007093440A1 (fr) 2006-02-17 2007-08-23 Itn Nanovation Ag Procédé d'épuration d'eaux usées
WO2007093441A1 (fr) 2006-02-17 2007-08-23 Itn Nanovation Ag Procédé d'épuration d'eaux usées
WO2007128565A2 (fr) 2006-05-08 2007-11-15 Itn Nanovation Ag Unité de filtre immergé pour le traitement des eaux usées et l'obtention d'eau potable
WO2010015374A1 (fr) 2008-08-04 2010-02-11 Itn Nanovation Ag Unité filtrante destinée au traitement de l’eau et d’autres milieux liquides

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10427105B2 (en) 2014-09-15 2019-10-01 Nanostone Water Inc. Filter device
CN105169946A (zh) * 2015-07-30 2015-12-23 澳水魔方（北京）环保科技有限公司 中空板式陶瓷膜的过滤系统
CN109316797A (zh) * 2018-12-03 2019-02-12 浙江联池水务设备股份有限公司 一种可拆钢模整体浇筑滤板

Also Published As

Publication number Publication date
AU2012344068A1 (en) 2014-07-03
DE102011087338A1 (de) 2013-05-29
EP2785441A1 (fr) 2014-10-08

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