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WO1994029007A1 - Process for cleaning the filter modules of a plant for purifying liquids - Google Patents

Process for cleaning the filter modules of a plant for purifying liquids Download PDF

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Publication number
WO1994029007A1
WO1994029007A1 PCT/CH1994/000103 CH9400103W WO9429007A1 WO 1994029007 A1 WO1994029007 A1 WO 1994029007A1 CH 9400103 W CH9400103 W CH 9400103W WO 9429007 A1 WO9429007 A1 WO 9429007A1
Authority
WO
WIPO (PCT)
Prior art keywords
cleaning
filtration
modules
flow direction
module
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/CH1994/000103
Other languages
German (de)
French (fr)
Inventor
Eduard Hartmann
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.)
Bucher Guyer AG
Original Assignee
Bucher Guyer 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 Bucher Guyer AG filed Critical Bucher Guyer AG
Priority to PL94307394A priority Critical patent/PL307394A1/en
Priority to AU67195/94A priority patent/AU6719594A/en
Priority to EP94915502A priority patent/EP0663852A1/en
Publication of WO1994029007A1 publication Critical patent/WO1994029007A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • B01D65/08—Prevention of membrane fouling or of concentration polarisation
    • 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
    • B01D61/145—Ultrafiltration
    • 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
    • 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
    • B01D2321/00—Details relating to membrane cleaning, regeneration, sterilization or to the prevention of fouling
    • B01D2321/20—By influencing the flow
    • B01D2321/2083—By reversing the flow

Definitions

  • the invention relates to a method for cleaning the filtration modules of a system for clarifying liquids, in particular using micro- or ultrafiltration.
  • the invention offers advantages especially when cleaning after the filtration of products with a high fiber content, such as. B. raw juices from fruit, vegetables or vegetable products.
  • the invention is therefore based on the object of providing a cleaning method for the systems mentioned at the outset which ensures a trouble-free workflow by periodically removing the fiber deposits.
  • this object is achieved in that, in the case of periodic cleaning, the cleaning medium, based on the filtration modules
  • Filtration operation flows in the opposite direction.
  • the fiber accumulations located at the entrance of the modules are easily detached and washed out of the modules. Due to the periodic cleaning, they are peeling off
  • Fiber accumulations are so small that they cannot clog the modules.
  • the figure shows schematically a semi-continuous Querstro filtration device, preferably comprising a micro or ultrafiltration device.
  • the method according to the invention can also be used with a or multi-stage continuously operated system can be used.
  • the product to be clarified is fed to a batch tank 3 via a line 1 and a prefilter 2.
  • a circulation pump 8 conveys the product to be clarified from the batch tank 3 into a retentate circuit 4 in which a filtration module 13 is arranged. After exiting the filtration module 13, the retentate flows back into the batch tank 3 via a line 17 and a filter 18. The per eat is discharged via a line 14.
  • valves 9 to 12 are closed and valves 9 and 11 are opened.
  • the valves can be operated mechanically, electrically, hydraulically or pneumatically.
  • a control 16 is provided for controlling the valves, but versions with manual operation are also possible.
  • the cleaning process can be initiated either periodically or as a function of the contamination state determined by a sensor 15.
  • the flow direction is switched before cleaning after the end of the filtration cycle and a subsequent product displacement.
  • water is pumped from an inlet line 7 into the retentate circuit 4 by closing a valve 5 and opening a valve 6 by the circulation pump 8. That after the end of the filtration cycle in the pipe system remaining retentate is displaced into batch tank 3.
  • the flow direction for the subsequent filtration cycle can be changed back to that of the previous filtration cycle, or it can be maintained. Maintaining the flow direction after cleaning has the advantage that the changing flow direction in the filtration cycles results in a more even load on the modules (longer service life).

Landscapes

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

Abstract

The process for cleaning the filter modules (13) of a cross-flow filter device is performed in a plant used to purify liquids, especially those with a high fibre content. The problem here is the continuous collection of fibres, especially at the inlet to the filter modules (13) at the fronts of the individual channels, which can lead to blockages. To remove the collections of fibres, the direction of flow in the module (13) during cleaning is the reverse of that in the previous filtration cycle. This is achieved by suitably switching valves (9 to 12). The reversal of the direction of flow means that the collections of fibres, which are still small, can easily be removed and rinsed out of the modules. Blockages of the modules can thus be prevented.

Description

Verfahren zum Reinigen der Filtrations- Module einer Anlage zur Klärung von FlüssigkeitenProcess for cleaning the filtration modules of a system for clarifying liquids

Die Erfindung betrifft ein Verfahren zum Reinigen der Filtrations- Module einer Anlage zur Klärung von Flüssigkeiten, insbesondere unter Verwendung von Mikro- oder Ultrafiltration. Die Erfindung bietet vor allem Vorteile, wenn eine Reinigung nach der Filtration von Produkten mit hohem Faseranteil, wie z. B. Rohsäften aus Obst, Gemüsen oder pflanzlichen Produkten, durchgeführt wird.The invention relates to a method for cleaning the filtration modules of a system for clarifying liquids, in particular using micro- or ultrafiltration. The invention offers advantages especially when cleaning after the filtration of products with a high fiber content, such as. B. raw juices from fruit, vegetables or vegetable products.

Bei der Klärung von Flüssigkeiten mit hohem Faseranteil ist es bekannt, dass sich Fasern bevorzugt am Eingang der Filtrationsmodule an den Stirnseiten der einzelnen Kanäle ansammeln und zu Verstopfungen führen können. DasWhen clarifying liquids with a high fiber content, it is known that fibers preferentially accumulate at the entrance of the filtration modules on the end faces of the individual channels and can lead to blockages. The

Einbringen von Fasern in die Filtrationsanlage kann auch durch Vorfiltern des zu klärenden Produktes nicht vollständig vermieden werden. Die Verstopfungen erfolgen entweder dadurch, dass die im Betrieb anwachsenden Faserablagerungen den Querschnitt der einzelnen Kanäle kontinuierlich vermindern oder dass sich ablösende Faserschichten in die Kanäle hineingespült werden und sich dort festsetzen. Letzteres geschieht häufig auch beim konventionellen Reinigen der Filtrationsmodule.Introducing fibers into the filtration system cannot be completely avoided even by pre-filtering the product to be clarified. The blockages occur either because the fiber deposits that grow during operation continuously reduce the cross-section of the individual channels or that detaching fiber layers are flushed into the channels and settle there. The latter often happens with conventional cleaning of the filtration modules.

Beim konventionellen Reinigen der Filtrationsmodule ist es bekannt, nach einer Produktverdrängung im Retentatkreislauf eine mehrstufige Reinigung durchzuführen. Dabei werden die Filtrationsmodule mit einer Reinigungslösung mit jeweils einer anschliessenden Wasserspülung durchströmt. Die Strömungsrichtung beim Reinigen entspricht der Arbeitsrichtung der Filtrationsanlage. Diese bekannte Massnahme zur Reinigung ist allein nicht ausreichend, die Verstopfungsgefahr infolge Faseransammlungen zu beseitigen, sondern kann, wie bereits erwähnt, selbst Verstopfungen hervorrufen. Die einzige, sehr aufwendige Möglichkeit eine Verstopfung infolge Faseransammlung zu vermeiden, besteht darin, in bestimmten Zeitabständen die Armaturen an den Modulen zu entfernen und diese im Eingangsbereich mechanisch zu reinigen.In conventional cleaning of the filtration modules it is known to carry out a multi-stage cleaning after product displacement in the retentate circuit. The filtration modules are each provided with a cleaning solution flows through a subsequent water rinse. The flow direction during cleaning corresponds to the working direction of the filtration system. This known measure for cleaning alone is not sufficient to eliminate the risk of clogging due to the accumulation of fibers, but, as already mentioned, can itself cause blockages. The only very expensive way to avoid clogging due to fiber accumulation is to remove the fittings on the modules at certain intervals and to clean them mechanically in the entrance area.

Der Erfindung liegt deshalb die Aufgabe zugrunde, ein Reinigungsverfahren für die eingangs erwähnten Anlagen zu schaffen, das einen störungsfreien Arbeitsablauf durch periodisches Entfernen der Faserablagerungen gewährleistet.The invention is therefore based on the object of providing a cleaning method for the systems mentioned at the outset which ensures a trouble-free workflow by periodically removing the fiber deposits.

Gemäss der Erfindung wird die Lösung dieser Aufgabe dadurch erreicht, dass bei einer periodischen Reinigung das Reinigungsmedium die Filtrationsmodule bezogen auf denAccording to the invention, this object is achieved in that, in the case of periodic cleaning, the cleaning medium, based on the filtration modules

Filtrationsbetrieb in umgekehrter Richtung durchströmt. Im Gegensatz zum bekannten Standardreinigungsverfahren werden so die am Eingang der Module befindlichen Faseransammlungen leicht abgelöst und aus den Modulen herausgespült. Aufgrund der periodischen Reinigung sind die sich ablösendenFiltration operation flows in the opposite direction. In contrast to the known standard cleaning process, the fiber accumulations located at the entrance of the modules are easily detached and washed out of the modules. Due to the periodic cleaning, they are peeling off

Faseransammlungen so klein, dass sie nicht zum Verstopfen der Module führen können.Fiber accumulations are so small that they cannot clog the modules.

Weitere Merkmale und vorteilhafte Ausgestaltungen der Erfindung sind den Patentansprüchen zu entnehmen.Further features and advantageous refinements of the invention can be found in the patent claims.

Die Erfindung ist in der folgenden Beschreibung und der Zeichnung, die ein Ausführungsbeispiel in schematischer Darstellung zeigt, näher erläutert.The invention is explained in more detail in the following description and the drawing, which shows an exemplary embodiment in a schematic representation.

Die Figur zeigt schematisch eine semikontinuierliche Querstro filtrationseinrichtung, vorzugsweise umfassend eine Mikro- oder Ultrafiltrationseinrichtung. Das erfindungsgemässe Verfahren kann jedoch auch bei einer ein- oder mehrstufigen kontinuierlich betriebenen Anlage verwendet werden.The figure shows schematically a semi-continuous Querstro filtration device, preferably comprising a micro or ultrafiltration device. However, the method according to the invention can also be used with a or multi-stage continuously operated system can be used.

Das zu klärende Produkt wird über eine Leitung 1 und einen Vorfilter 2 einem Batchtank 3 zugeführt. Eine Umwälzpumpe 8 fördert das zu klärende Produkt aus dem Batchtank 3 in einen Retentatkreislauf 4, in dem ein Filtrationsmodul 13 angeordnet ist. Nach Austritt aus dem Filtrationsmodul 13 fliesst das Retentat über eine Leitung 17 und ein Filter 18 zurück in den Batchtank 3. Das Per eat wird über eine Leitung 14 abgeführt.The product to be clarified is fed to a batch tank 3 via a line 1 and a prefilter 2. A circulation pump 8 conveys the product to be clarified from the batch tank 3 into a retentate circuit 4 in which a filtration module 13 is arranged. After exiting the filtration module 13, the retentate flows back into the batch tank 3 via a line 17 and a filter 18. The per eat is discharged via a line 14.

Trotz Verwendung des Vorfilters 2 gelangen in die Filtrationsanlage Fasern, die sich vor allem am Eingang des Filtrationsmodules an den Stirnseiten von darin angeordneten einzelnen Kanälen ansammeln. Aufgund des erfindungsgemässen Verfahrens kann beim Reinigen zur Beseitigung dieser Ablagerungen die Fliessrichtung des strömenden Mediums im Filtrationsmodul 13 umgekehrt werden. Dies geschieht durch Aenderung der Ventilstellungen von Ventilen 9 bis 12. Zur Umkehr der in der Figur dargestellten Fliessrichtung werden die Ventile 10 und 12 geschlossen und die Ventile 9 und 11 geöffnet. Die Betätigung der Ventile kann mechanisch, elektrisch, hydraulisch oder pneumatisch erfolgen. Für die Ansteuerung der Ventile ist im vorliegenden Beispiel eine Steuerung 16 vorgesehen, es sind aber auch Ausführungen mit Handbedienung möglich. Das Einleiten des ReinigungsVorganges kann entweder periodisch oder in Abhängigkeit vom mit einem Sensor 15 ermittelten Verschmutzungszustand erfolgen.In spite of the use of the prefilter 2, fibers enter the filtration system, which collect above all at the entrance of the filtration module on the end faces of individual channels arranged therein. On the basis of the method according to the invention, the direction of flow of the flowing medium in the filtration module 13 can be reversed when cleaning to remove these deposits. This is done by changing the valve positions of valves 9 to 12. To reverse the flow direction shown in the figure, valves 10 and 12 are closed and valves 9 and 11 are opened. The valves can be operated mechanically, electrically, hydraulically or pneumatically. In the present example, a control 16 is provided for controlling the valves, but versions with manual operation are also possible. The cleaning process can be initiated either periodically or as a function of the contamination state determined by a sensor 15.

Die Umschaltung der Fliessrichtung erfolgt vor dem Reinigen nach Ende des Filtrationszyklus und einer nachfolgenden ProduktVerdrängung. Hierbei wird, wie durch den Pfeil 27 angedeutet, durch Schliessen eines Ventils 5 und Oeffnen eines Ventils 6 durch die Umwälzpumpe 8 Wasser aus einer Zulaufleitung 7 in den Retentatkreislauf 4 gepumpt. Das nach Ende des Filtrationszyklus im Leitungssystem verbliebene Retentat wird dabei in den Batchtank 3 verdrängt.The flow direction is switched before cleaning after the end of the filtration cycle and a subsequent product displacement. Here, as indicated by arrow 27, water is pumped from an inlet line 7 into the retentate circuit 4 by closing a valve 5 and opening a valve 6 by the circulation pump 8. That after the end of the filtration cycle in the pipe system remaining retentate is displaced into batch tank 3.

Nach Ende des Reinigungszyklus kann für den nachfolgenden Filtrationszyklus die Fliessrichtung wieder in jene des vorhergehenden Filtrationszyklus geändert oder aber beibehalten werden. Die Beibehaltung der Fliessrichtung nach dem Reinigen hat den Vorteil, dass durch die wechselnde Flussrichtung bei den Filtrationszyklen eine gleichmassigere Belastung der Module (höhere Lebensdauer) erreicht wird. After the cleaning cycle has ended, the flow direction for the subsequent filtration cycle can be changed back to that of the previous filtration cycle, or it can be maintained. Maintaining the flow direction after cleaning has the advantage that the changing flow direction in the filtration cycles results in a more even load on the modules (longer service life).

Claims

PATENTANSPRUECHE PATENT CLAIMS 1. Verfahren zum Reinigen der Filtrations- Module (13) einer Anlage zur Klärung von Flüssigkeiten mit hohem Faseranteil, insbesondere unter Verwendung von Mikro- oder Ultrafiltration, dadurch gekennzeichnet, dass die Strömungsrichtung im Modul (13) umkehrbar ist.1. A method for cleaning the filtration modules (13) of a system for clarifying liquids with a high fiber content, in particular using micro- or ultrafiltration, characterized in that the direction of flow in the module (13) is reversible. 2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass vor dem Reinigungszyklus die Strömungsrichtung im Modul2. The method according to claim 1, characterized in that the flow direction in the module before the cleaning cycle (13) umgekehrt wird.(13) is reversed. 3. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass vor dem nachfolgenden Filtrationszyklus die Strömungsrichtung im Modul (13) umgekehrt wird.3. The method according to claim 1, characterized in that the flow direction in the module (13) is reversed before the subsequent filtration cycle. 4. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass jeweils vor dem Wasch- und Filtrationszyklus die Strömungsrichtung im Modul (13) umgekehrt wird.4. The method according to claim 1, characterized in that the flow direction in the module (13) is reversed in each case before the washing and filtration cycle. 5. Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass eine Betätigung von für die5. The method according to any one of claims 1 to 4, characterized in that an actuation of for Umkehrung der Fliessrichtung erforderlichen Ventilen (9, 10, 11, 12) mechanisch, elektrisch, pneumatisch oder hydraulisch erfolgt.Reversal of the flow direction required valves (9, 10, 11, 12) mechanically, electrically, pneumatically or hydraulically. 6. Verfahren nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass die Ansteuerung der für die Umkehrung der Fliessrichtung erforderlichen Ventile (9, 10, 11, 12) von Hand oder über eine Steuerung (16) erfolgt.6. The method according to any one of claims 1 to 5, characterized in that the control of the valves required for reversing the flow direction (9, 10, 11, 12) is carried out manually or via a controller (16). Verfahren nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass der Verschmutzungsgrad durch Aufbau von Ablagerungen am Eingang der Filtrationselemente mit Sensoren (15) überwacht und der Reinigungsvorgang nach . Erreichen eines festgelegten Verschmutzungsgrenzwertes automatisch eingeleitet wird.Method according to one of claims 1 to 6, characterized in that the degree of contamination is monitored by building up deposits at the entrance of the filtration elements with sensors (15) and the cleaning process after. Reaching a specified pollution limit is automatically initiated. 8. Verfahren nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, dass die zu klärende Flüssigkeit nach durchlaufen der Filtrationsmodule (13) durch ein Filter (18) zusätzlich geklärt wird. 8. The method according to any one of claims 1 to 7, characterized in that the liquid to be clarified after passing through the filtration modules (13) is additionally clarified by a filter (18).
PCT/CH1994/000103 1993-06-11 1994-06-02 Process for cleaning the filter modules of a plant for purifying liquids Ceased WO1994029007A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
PL94307394A PL307394A1 (en) 1993-06-11 1994-06-02 Method of cleaning filtering modules of an apparatus for clarification of liquids
AU67195/94A AU6719594A (en) 1993-06-11 1994-06-02 Process for cleaning the filter modules of a plant for purifying liquids
EP94915502A EP0663852A1 (en) 1993-06-11 1994-06-02 Process for cleaning the filter modules of a plant for purifying liquids

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH175893 1993-06-11
CH1758/93-4 1993-06-11

Publications (1)

Publication Number Publication Date
WO1994029007A1 true WO1994029007A1 (en) 1994-12-22

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PCT/CH1994/000103 Ceased WO1994029007A1 (en) 1993-06-11 1994-06-02 Process for cleaning the filter modules of a plant for purifying liquids

Country Status (8)

Country Link
EP (1) EP0663852A1 (en)
AU (1) AU6719594A (en)
CA (1) CA2141846A1 (en)
CZ (1) CZ35195A3 (en)
HU (1) HUT71041A (en)
NZ (1) NZ266122A (en)
PL (1) PL307394A1 (en)
WO (1) WO1994029007A1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998022204A1 (en) * 1996-11-21 1998-05-28 Memtec America Corporation Microporous membrane filtration and backwashing process
FR2817485A1 (en) * 2000-12-06 2002-06-07 Commissariat Energie Atomique DECOLMATION OF A HOLLOW FIBER FILTER OPERATING IN FRONTAL MODE
EP1691915A4 (en) * 2003-12-07 2007-01-24 Univ Ben Gurion METHOD AND SYSTEM FOR INCREASING RECOVERY AND PREVENTING PRECIPITATION ENCRYPTION IN PRESSURE MEMBRANE PROCESSES
WO2007139374A1 (en) * 2006-05-31 2007-12-06 X-Flow B.V. Apparatus having a bioreactor and membrane filtration module for treatment of an incoming fluid

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3818437A1 (en) * 1988-05-31 1989-12-07 Joseph Dipl Ing Brokhage Filter battery
EP0355632A1 (en) * 1988-08-19 1990-02-28 AG für industrielle Elektronik AGIE Losone bei Locarno Method for the treatment of the machining liquid of an electroerosion machine
EP0355631A1 (en) * 1988-08-19 1990-02-28 AG für industrielle Elektronik AGIE Losone bei Locarno Device for the treatment of the machining liquid of an electroerosion machine
WO1992000797A1 (en) * 1990-07-06 1992-01-23 Bucher-Guyer Ag Maschinenfabrik Process for rinsing the filter module of a device for purifying liquids

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3818437A1 (en) * 1988-05-31 1989-12-07 Joseph Dipl Ing Brokhage Filter battery
EP0355632A1 (en) * 1988-08-19 1990-02-28 AG für industrielle Elektronik AGIE Losone bei Locarno Method for the treatment of the machining liquid of an electroerosion machine
EP0355631A1 (en) * 1988-08-19 1990-02-28 AG für industrielle Elektronik AGIE Losone bei Locarno Device for the treatment of the machining liquid of an electroerosion machine
WO1992000797A1 (en) * 1990-07-06 1992-01-23 Bucher-Guyer Ag Maschinenfabrik Process for rinsing the filter module of a device for purifying liquids

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998022204A1 (en) * 1996-11-21 1998-05-28 Memtec America Corporation Microporous membrane filtration and backwashing process
FR2817485A1 (en) * 2000-12-06 2002-06-07 Commissariat Energie Atomique DECOLMATION OF A HOLLOW FIBER FILTER OPERATING IN FRONTAL MODE
WO2002045829A1 (en) * 2000-12-06 2002-06-13 Commissariat A L'energie Atomique Backwashing of a hollow fibre filter operating in frontal mode
EP1691915A4 (en) * 2003-12-07 2007-01-24 Univ Ben Gurion METHOD AND SYSTEM FOR INCREASING RECOVERY AND PREVENTING PRECIPITATION ENCRYPTION IN PRESSURE MEMBRANE PROCESSES
US8137539B2 (en) 2003-12-07 2012-03-20 Ben-Gurion University Of The Negev Research And Development Authority Method and system for increasing recovery and preventing precipitation fouling in pressure-driven membrane processes
US9649598B2 (en) 2003-12-07 2017-05-16 Ben-Gurion University Of The Negev Research And Development Authority Method and system for increasing recovery and preventing precipitation fouling in pressure-driven membrane processes
WO2007139374A1 (en) * 2006-05-31 2007-12-06 X-Flow B.V. Apparatus having a bioreactor and membrane filtration module for treatment of an incoming fluid
AU2007268414B2 (en) * 2006-05-31 2011-07-14 X-Flow B.V. Apparatus having a bioreactor and membrane filtration module for treatment of an incoming fluid
KR101233775B1 (en) 2006-05-31 2013-02-15 엑스-플로우 비.브이. Apparatus having a bioreactor and membrane filtration module for treatment of an incoming fluid
US10266439B2 (en) 2006-05-31 2019-04-23 X-Flow B.V. Method for cleaning membranes and an inlet side of a membrane filtration module of an apparatus having a bioreactor and membrane filtration module for treatment of an incoming fluid

Also Published As

Publication number Publication date
PL307394A1 (en) 1995-05-15
HU9500422D0 (en) 1995-04-28
CA2141846A1 (en) 1994-12-22
HUT71041A (en) 1995-11-28
NZ266122A (en) 1996-12-20
CZ35195A3 (en) 1995-09-13
EP0663852A1 (en) 1995-07-26
AU6719594A (en) 1995-01-03

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