| 摘要 |
The invention relates to a method for purifying an aqueous solution having suspended solids, comprising a step of coagulation-flocculation, consisting of: a) a step of adding coagulants to the aqueous solution to be treated, followed by; b) a step of agitating the aqueous solution added to in this way; c) a step of separating the coagulated solids by decantation or flotation; d) a step of recovering a purified water; characterised in that the coagulants added in step a) comprise at least one modified or unmodified tannin and a liquid starch composition comprising a soluble cationic starch, said liquid starch composition having a viscosity, measured according to a test A, greater than 1000 mPa.s, this test A consisting of adjusting the dry mass of cationic starch of the liquid composition to 10% then measuring the Brookfield viscosity at 25°C for the resulting composition. The invention also relates to a liquid composition of cationic starch and tannin suitable for use in the method. |
