(19)

(11)

EP 2 217 537 A2

(12)

(88) Date of publication A3: 11.06.2009 (43) Date of publication: 18.08.2010 Bulletin 2010/33 (21) Application number: 08838715.4 (22) Date of filing: 16.10.2008

(51) International Patent Classification (IPC):  C02F 3/28(2006.01) C02F 3/34(2006.01) (86) International application number: PCT/IB2008/054247 (87) International publication number: WO 2009/050661 (23.04.2009 Gazette 2009/17)

(84) Designated Contracting States: AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MT NL NO PL PT RO SE SI SK TR Designated Extension States: AL BA MK RS (30) Priority: 16.10.2007 ZA 200708838 (71) Applicant: Water Research Commission 0031 Pretoria (ZA)	(72) Inventors: RISTOW, Neil Eric 1459 Boksburg (ZA) JOUBERT, Johannes Hendrikus Brand 1000 Cullinan (ZA) (74) Representative: Daniels, Jeffrey Nicholas  Page White & Farrer Bedford House John Street London WC1N 2BF John Street London WC1N 2BF (GB)