(19)

(11)

EP 1 409 418 A1

(12)

(43) Date of publication: 21.04.2004 Bulletin 2004/17 (21) Application number: 02742639.4 (22) Date of filing: 19.07.2002

(51) International Patent Classification (IPC)7: C02F 1/52 (86) International application number: PCT/CH2002/000402 (87) International publication number: WO 2003/008343 (30.01.2003 Gazette 2003/05)

(84) Designated Contracting States: AT BE BG CH CY CZ DE DK EE ES FI FR GB GR IE IT LI LU MC NL PT SE SK TR Designated Extension States: AL LT LV MK RO SI (30) Priority: 19.07.2001 WO PCT/CH01/00452 (71) Applicant: Optima Environnement SA 1260 Nyon (CH)	(72) Inventors: MARISON, Ian, William CH-1026 Echandens (CH) DÖRRIES, Stephan, Christos CH-1006 Lausanne (CH) (74) Representative: Besse, François  ANDRE ROLAND IPS,15, Avenue Tissot,P.O. Box 1255 1001 Lausanne 1001 Lausanne (CH)