(19)

(11)

EP 4 003 921 A1

(12)

(43) Date of publication: 01.06.2022 Bulletin 2022/22 (21) Application number: 20742773.3 (22) Date of filing: 24.07.2020

(51) International Patent Classification (IPC):  C02F 9/00(2006.01) C02F 3/28(2006.01) B01D 3/10(2006.01) (52) Cooperative Patent Classification (CPC): C02F 9/00; C02F 3/28; B01D 3/10; B01D 3/06; B01D 5/006; C02F 11/04; C02F 11/18 (86) International application number: PCT/EP2020/070991 (87) International publication number: WO 2021/018780 (04.02.2021 Gazette 2021/05)

(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 (30) Priority: 29.07.2019 US 201962879694 P 20.09.2019 US 201962903138 P 18.06.2020 EP 20305667 (71) Applicant: SUEZ Groupe 92040 Paris la Défense Cedex (FR)	(72) Inventors: HADDAD, Mathieu 92310 Sèvres (FR) PARDO, Pierre Emmanuel 91400 Orsay (FR) GEAUGEY, Valéry 78580 Maule (FR) (74) Representative: IPAZ  16, rue Gaillon 75002 Paris 75002 Paris (FR)