WO2006055382A1 - Process for cleaning a filtration membrane - Google Patents
Process for cleaning a filtration membrane Download PDFInfo
- Publication number
- WO2006055382A1 WO2006055382A1 PCT/US2005/040728 US2005040728W WO2006055382A1 WO 2006055382 A1 WO2006055382 A1 WO 2006055382A1 US 2005040728 W US2005040728 W US 2005040728W WO 2006055382 A1 WO2006055382 A1 WO 2006055382A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- cleaning
- membrane
- enzymatic
- cleaning solution
- acidic
- Prior art date
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
- B01D65/02—Membrane cleaning or sterilisation ; Membrane regeneration
-
- 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
- B01D65/06—Membrane cleaning or sterilisation ; Membrane regeneration with special washing compositions
-
- 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
- B01D2321/04—Backflushing
-
- 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
- B01D2321/16—Use of chemical agents
- B01D2321/166—Use of enzymatic agents
-
- 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
- B01D2321/28—Details relating to membrane cleaning, regeneration, sterilization or to the prevention of fouling by soaking or impregnating
Definitions
- the present invention relates to the cleaning of filtration membranes, which are used for the treatment of wastewater.
- Specific cleaning agents provide information about the nature and physicochemical properties of the foulants. Interactions between foulants and membrane material are disturbed or broken by the use of cleaning agents which provide information about the type of bounding between the foulants and membrane material.
- membranes are either cleaned hydraulically or chemically. Hydraulic cleaning can be carried out with water or a combination of water and air. Chemical cleaning can be carried out by a variety of cleaning chemicals.
- Chemical cleaning contains several steps which have to be carried out in a certain order. First a back flush (BF) or forward flush (FF) is provided to remove the reversible fouling.
- the chemical cleaning solution can be introduced to the membrane surface by a BF or FF. Then the membranes are often beeing soaked for a certain time. To introduce mechanical energy the cleaning solution can be pumped along the membrane surface.
- the last step is flushing the membranes with permeate, tap water or ultra pure water.
- a process for cleaning a filtration membrane the membrane being used for the filtration of waste water treatment plant effluent, wherein the process comprises at least one enzymatic cleaning step using an enzymatic cleaning solution.
- An enzymatic cleaning step can advantageously reduce or eliminate irreversible fouling, which is caused during ultrafiltration of waste water treatment plant effluent and which is probably caused by protein adsorption as one of the main constituents of extracellular polymeric substances. Therefore a new enzymatic cleaning protocol based on an enzymatic cleaning solution is applied by the present invention.
- the cleaning step is carried out with the enzymatic cleaning solution having a temperature from 10 to 50°C, particularly from 25 to 3O 0 C.
- the process according to the present invention can comprise the flushing of the membrane with water before or after the enzymatic cleaning step or both.
- the water used for flushing can be for example tap water or a permeate of a membrane in the waste water treatment plant.
- the enzymatic cleaning solution can be circulated across the membrane for a circulation time.
- the circulation time can be preferably from 10 minutes to 1.5 hours, particularly 1 hour .
- the membrane can be soaked with the enzymatic cleaning solution for a soaking time, the soaking time being preferably from 12 to 48 hours, particularly 24 hours.
- the enzymatic cleaning step contains the steps
- the membrane which can be cleaned by the process of the present invention can be for example an ultrafiltration membrane, a microfiltration membrane, a nanofiltration membrane or a reverse osmosis membrane.
- the enzymatic cleaning solution contains a proteolytic enzyme from the endo or exo type or a mixture thereof.
- the enzymatic cleaning solution contains protease.
- the enzymatic cleaning solution used in the process of the present invention preferably contains an enzyme with a concentration from 0.0125% to 0.1%.
- the enzymatic cleaning solution has a pH- value from 8.5 to 10.
- the membrane cleaning process of the present invention can contain an acidic cleaning step using an acidic cleaning solution for cleaning the membrane.
- the acidic cleaning step can applied before the enzymatic cleaning step, after the enzymatic cleaning step or both before and after the enzymatic cleaning step.
- a mild acidic pre cleaning is applied before applying the enzymatic cleaning protocol.
- the acidic cleaning solution can contain at least one acid and at least one supplementary cleaning agent.
- the at least one supplementary cleaning agent can be chosen from the group of surfactants, chelating agents and sequestrants.
- the acidic cleaning solution has a pH- value smaller than 3.
- the membrane cleaning process of the present invention can contain an alkaline cleaning step using an alkaline cleaning solution for cleaning the membrane.
- the alkaline cleaning solution can contain at least one base and at least one supplementary cleaning agent.
- the at least one supplementary cleaning agent can be chosen from the group of surfactants, chelating agents and sequestrants.
- the alkaline cleaning solution has a pH-value greater than 9, particularly from 9.3 to 12.5.
- different cleaning steps can be carried out successively.
- the different cleaning steps are preferably carried out with time gaps in the range of days or weeks in between.
- Different cleaning steps can also be carried out one after the other without a considerable time gap in between.
- figure 1 shows a schematic drawing of the configuration of a pilot plant, the membranes of which can be cleaned using the process according to the present invention.
- waste water treatment plant effluent 1 is lead to a screen 2, from where it can pass directly to a microfiltration device 3 or first to a multimedia filter 4 and then to the microfiltration device 3.
- the microfiltered liquid coming from the microfiltration device 3 enters an ultrafiltration device 5.
- the membranes 6 and 7 of the microfiltration device 3 and the ultrafiltration device 5 are exposed to fouling, their clean water flux being reduced.
- the process of the present invention can be applied to these membranes.
- FIG. 1 A configuration as shown in figure 1 was used for testing the process according to the present invention.
- the multimedia filter 4 contained one layer of anthracite and one layer of sand and was operated with a fixed water level above the filter bed of 1.73 meter. Coagulant could be dosed in-line the feed water pipe and mixed in a static mixer before the feed water entered the filter. Flocculation took place above and in the filter bed.
- the microfiltration device 3 contained three modules providing a membrane surface area of 45 m .
- the pore size of the membranes was 0.2 ⁇ m.
- the installation was operated at constant flux, which varied between 50 and 105 l/m 2 -h, and with a production interval of 15 minutes followed by a back wash. Chemical cleaning was performed once or twice a week depending on the filtration resistance.
- the ultrafiltration device 5 contained membranes of X-flow with a capillary diameter of 0.8 mm and a pore size of 0.02 ⁇ m.
- the installation capacity was 10 m 3 /h and was equipped with two 8-inch modules, each with a length of 1.5 meter, providing a membrane area of 70 m 2 .
- the installation was operated at constant flux. Coagulant could be dosed in-line to the feed water.
- the method of Rosenberger has been modified in order to measure proteins in waste water treatment plant effluent. This method is based on the method of Lowry. The adsorption of the formed colour is measured at 750 nm in a 4 cm glass cuvet by the photo spectrometer Milton Roy spectromic 401. The amount of proteins is expressed in mg/1.
- the results of the first enzymatic and basic alkaline cleaning experiments are presented in table 3 in chronological order.
- the Clean Water Flux (CWF) is normalized to 20 °C.
- the CWF of a new membrane module is between 400 and 500 l/m 2 -h-bar at 20 0 C, given by the manufacture.
- the results of these cleaning experiments as well as the membrane fouling after cleaning at the first waste water treatment plant and the second waste water treatment plant respectively are presented as the clean water flux (CWF) normalized at 20 °C against time.
- the CWF decreases rapidly after starting ultrafiltration of microfiltrate, especially when the CWF starts above 400 l/m 2 -h-bar.
- the CWF decreases from around 440 to 220 l/m 2 -h-bar in about 1 day and decreases further to approximately 150 l/m 2 -h-bar in about 3 days.
- the CWF at the second waste water treatment plant decreases from around 430 to 305 l/m 2 -h-bar in about 1 day and decreases further to approximately 260 l/m 2 -h-bar in about 3 days.
- the CWF decline after 1 day of ultrafiltration of microfiltrate is around 50 % compared to around 30 % at the second waste water treatment plant, which is 40 % less.
- the CWF is levelling off to 160 l/m 2 -h-bar at the first waste water treatment plant whereas at the second waste water treatment plant this value is found around 260 l/m 2 -h-bar.
- FIG. 2 CWF measurements of cleaned and fouled membranes by ultrafiltration of microfiltrate at the first waste water treatment plant ⁇ Enzymatic (1) ⁇ Basic alkaline (1) A Enzymatic (2) " ⁇ Basic alkaline (2)
- the results show a recovery of the clean water flux of 100 % with respect to the original clean water flux of the membrane module itself after applying the enzymatic cleaning protocol.
- This protocol it is possible to perform an enzymatic cleaning at low temperature (25-30 0 C) and is therefore applicable for low temperature resistance membranes.
Abstract
Description
Claims
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP05849205A EP1827661A1 (en) | 2004-11-16 | 2005-11-10 | Process for cleaning a filtration membrane |
MX2007005833A MX2007005833A (en) | 2004-11-16 | 2005-11-10 | Process for cleaning a filtration membrane. |
JP2007543124A JP2008520428A (en) | 2004-11-16 | 2005-11-10 | Filtration membrane cleaning method |
BRPI0518179-8A BRPI0518179A (en) | 2004-11-16 | 2005-11-10 | process for cleaning a filtration membrane |
AU2005306742A AU2005306742A1 (en) | 2004-11-16 | 2005-11-10 | Process for cleaning a filtration membrane |
CA002587520A CA2587520A1 (en) | 2004-11-16 | 2005-11-10 | Process for cleaning a filtration membrane |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP04027188A EP1656987A1 (en) | 2004-11-16 | 2004-11-16 | Process for cleaning a filtration membrane |
EP04027188.4 | 2004-11-16 | ||
EP04029813 | 2004-12-16 | ||
EP04029813.5 | 2004-12-16 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2006055382A1 true WO2006055382A1 (en) | 2006-05-26 |
Family
ID=36123104
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US2005/040728 WO2006055382A1 (en) | 2004-11-16 | 2005-11-10 | Process for cleaning a filtration membrane |
Country Status (8)
Country | Link |
---|---|
EP (1) | EP1827661A1 (en) |
JP (1) | JP2008520428A (en) |
KR (1) | KR20070086259A (en) |
AU (1) | AU2005306742A1 (en) |
BR (1) | BRPI0518179A (en) |
CA (1) | CA2587520A1 (en) |
MX (1) | MX2007005833A (en) |
WO (1) | WO2006055382A1 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2009022832A1 (en) * | 2007-08-16 | 2009-02-19 | Kolon Industries, Inc. | An apparatus for cleaning a membrane module and a method therefor. |
WO2009089587A1 (en) * | 2008-01-16 | 2009-07-23 | Orica Australia Pty Ltd | Membrane regeneration |
CN102139173A (en) * | 2010-01-29 | 2011-08-03 | 铜陵市华兴化工有限公司 | Cleaning agent for ceramic filter plate and cleaning method thereof |
NL2009750C2 (en) * | 2012-11-02 | 2014-05-08 | We Consult Holding B V | METHOD FOR PURIFYING WATER AND AN APPARATUS APPROPRIATE. |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP5245596B2 (en) * | 2008-07-15 | 2013-07-24 | 栗田工業株式会社 | Reverse osmosis membrane performance recovery method and membrane separation treatment method |
JP6406394B1 (en) * | 2017-05-29 | 2018-10-17 | 栗田工業株式会社 | Nonionic surfactant-containing water treatment method and water treatment method |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2660211A1 (en) * | 1990-03-27 | 1991-10-04 | Ceramiques Tech Soc D | Process for cleaning semipermeable membranes |
JPH05247868A (en) * | 1992-02-28 | 1993-09-24 | Mitsubishi Paper Mills Ltd | Treatment of waste water in production of pulp |
DE19503060A1 (en) * | 1995-02-01 | 1996-08-08 | Henkel Ecolab Gmbh & Co Ohg | Cleaning procedure for membrane filters |
US6071356A (en) * | 1995-07-12 | 2000-06-06 | Novo Nordisk Als | Cleaning-in-place with a solution containing a protease and a lipase |
-
2005
- 2005-11-10 WO PCT/US2005/040728 patent/WO2006055382A1/en active Application Filing
- 2005-11-10 CA CA002587520A patent/CA2587520A1/en not_active Abandoned
- 2005-11-10 MX MX2007005833A patent/MX2007005833A/en unknown
- 2005-11-10 KR KR1020077013554A patent/KR20070086259A/en not_active Application Discontinuation
- 2005-11-10 AU AU2005306742A patent/AU2005306742A1/en not_active Abandoned
- 2005-11-10 JP JP2007543124A patent/JP2008520428A/en active Pending
- 2005-11-10 EP EP05849205A patent/EP1827661A1/en not_active Withdrawn
- 2005-11-10 BR BRPI0518179-8A patent/BRPI0518179A/en not_active Application Discontinuation
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2660211A1 (en) * | 1990-03-27 | 1991-10-04 | Ceramiques Tech Soc D | Process for cleaning semipermeable membranes |
JPH05247868A (en) * | 1992-02-28 | 1993-09-24 | Mitsubishi Paper Mills Ltd | Treatment of waste water in production of pulp |
DE19503060A1 (en) * | 1995-02-01 | 1996-08-08 | Henkel Ecolab Gmbh & Co Ohg | Cleaning procedure for membrane filters |
US6071356A (en) * | 1995-07-12 | 2000-06-06 | Novo Nordisk Als | Cleaning-in-place with a solution containing a protease and a lipase |
Non-Patent Citations (2)
Title |
---|
ALLIE Z ET AL: "Enzymatic cleaning of ultrafiltration membranes fouled by abattoir effluent", JOURNAL OF MEMBRANE SCIENCE, ELSEVIER SCIENTIFIC PUBL.COMPANY. AMSTERDAM, NL, vol. 218, no. 1-2, 1 July 2003 (2003-07-01), pages 107 - 116, XP004434449, ISSN: 0376-7388 * |
PATENT ABSTRACTS OF JAPAN vol. 018, no. 012 (C - 1150) 11 January 1994 (1994-01-11) * |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2009022832A1 (en) * | 2007-08-16 | 2009-02-19 | Kolon Industries, Inc. | An apparatus for cleaning a membrane module and a method therefor. |
WO2009089587A1 (en) * | 2008-01-16 | 2009-07-23 | Orica Australia Pty Ltd | Membrane regeneration |
CN102139173A (en) * | 2010-01-29 | 2011-08-03 | 铜陵市华兴化工有限公司 | Cleaning agent for ceramic filter plate and cleaning method thereof |
CN102139173B (en) * | 2010-01-29 | 2013-02-27 | 铜陵市华兴化工有限公司 | Cleaning agent for ceramic filter plate and cleaning method thereof |
NL2009750C2 (en) * | 2012-11-02 | 2014-05-08 | We Consult Holding B V | METHOD FOR PURIFYING WATER AND AN APPARATUS APPROPRIATE. |
Also Published As
Publication number | Publication date |
---|---|
BRPI0518179A (en) | 2008-11-04 |
CA2587520A1 (en) | 2006-05-26 |
EP1827661A1 (en) | 2007-09-05 |
MX2007005833A (en) | 2007-10-10 |
KR20070086259A (en) | 2007-08-27 |
AU2005306742A1 (en) | 2006-05-26 |
JP2008520428A (en) | 2008-06-19 |
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