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1. (WO2015118275) PROCESS FOR THICKENING OR DEHYDRATING SLUDGE

Pub. No.:    WO/2015/118275    International Application No.:    PCT/FR2015/050291
Publication Date: Fri Aug 14 01:59:59 CEST 2015 International Filing Date: Sat Feb 07 00:59:59 CET 2015
IPC: C02F 11/14
C02F 1/24
C02F 1/56
C02F 11/12
C02F 103/28
Applicants: ROQUETTE FRERES
Inventors: CROWTHER-ALWYN, Laura
CARRE, Medhi
Title: PROCESS FOR THICKENING OR DEHYDRATING SLUDGE
Abstract:
The subject matter of the invention is a process for thickening or dehydrating a sludge, comprising at least: • a) a step of adding cationic starch (AC) to the sludge to be treated; • b) a step of adding clay (AR) to the sludge to be treated; • c) followed by a step of flocculating by stirring the sludge added to in this way, so as to form a mixture of flocs and an aqueous solution; • d) followed by a step of mechanically separating the flocs and the aqueous solution formed in the previous step; • e) followed by a step of recovering the aqueous solution and the flocs forming a sludge which has been treated; AR AR AC.