(19)

(11)

EP 3 894 362 A1

(12)

(43) Date of publication: 20.10.2021 Bulletin 2021/42 (21) Application number: 18825795.0 (22) Date of filing: 12.12.2018

(51) International Patent Classification (IPC):  C02F 3/12(2006.01) B01F 3/04(2006.01) C02F 3/20(2006.01) (52) Cooperative Patent Classification (CPC): C02F 3/12; C02F 2209/06; C02F 2209/005; Y02W 10/10; C02F 2209/02; C02F 2209/04; C02F 2209/22; C02F 3/20 (86) International application number: PCT/IB2018/059898 (87) International publication number: WO 2020/121025 (18.06.2020 Gazette 2020/25)

(84) Designated Contracting States: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR Designated Extension States: BA ME Designated Validation States: KH MA MD TN (71) Applicant: SUEZ Groupe 92040 Paris La Défense (FR)	(72) Inventors: CHOWDHURY, Nabin Glen Allen, Virginia 23060 (US) KALDATE, Amit Glen Allen, Virginia 23060 (US) FOUCHET, Anne-Marie Glen Allen, Virginia 23060 (US) BALLARD, Temple Glen Allen, Virginia 23059 (US) VIEIRA, Adriano Richmond, 23225 (US) (74) Representative: IPAZ  16, rue Gaillon 75002 Paris 75002 Paris (FR)