(19)

(11)

EP 0 879 079 A1

(12)

(43) Date of publication: 25.11.1998 Bulletin 1998/48 (21) Application number: 97932903.0 (22) Date of filing: 16.07.1997

(51) International Patent Classification (IPC):  B01D 57/ 02( . ) B01D 63/ 16( . ) C02F 1/ 00( . ) C02F 1/ 44( . ) B01D 61/ 42( . ) B01D 65/ 08( . ) C02F 1/ 36( . ) C02F 1/ 469( . ) (86) International application number: PCT/GB1997/001926 (87) International publication number: WO 1998/003245 (29.01.1998 Gazette 1998/04)

(84) Designated Contracting States: AT BE CH DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE (30) Priority: 18.07.1996 GB 19960015073 13.05.1997 GB 19970009663 (71) Applicant: Atkins Fulford Ltd Sudbury, Suffolk CO10 6TG (GB)	(72) Inventors: QUIGLEY, Michael Bernard Coupland Dorset BH23 5BL (GB) WAKEMAN, Richard, John Clyst St. MaryExeter EX5111DD (GB) (74) Representative: Fisher, Adrian John  CARPMAELS & RANSFORD 43 Bloomsbury Square London WC1A 2RA London WC1A 2RA (GB)