Potabilization process

• Main Authors: CROWTHER-ALWYN LAURA, HERRENG ANNEANTAL, POTTIER CELINE, HOUZE REGIS
• Format: Patent
• Language: English
• Published: 15.07.2015
• Subjects: CHEMISTRY; METALLURGY; TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE

The subject matter of the invention is a process for potabilization of an aqueous solution containing solids in suspension, comprising a coagulation-flocculation step, characterized in that said step comprises: a) a step of adding coagulants to the aqueous solution to be treated; b) a step of stirring the aqueous solution to which coagulants were thus added; c) a step of separating the coagulated solids by settling out or flotation; d) a step of recovering purified water; and in which the coagulants added in step a) comprise metal salts chosen from ferric salts and aluminium salts, and also a liquid starchy composition comprising a cationic waxy starch, said cationic starch having, when it is placed in the form of an aqueous composition, a viscosity, measured according to a test A, greater than 100 mPa.s and less than 1000 mPa.s, this test A consisting in adjusting the dry weight of cationic waxy starch of the aqueous composition to 10% and then measuring the Brookfield viscosity at 25 DEG C of the resulting composition.