| 摘要 |
A potabilisation method of a water to be treated, containing a coagulation-flocculation step wherein the step includes: a) a step of adding a liquid composition including a solubilized cationic starch to the aqueous solution to be treated; b) a step of adding one or several metal salts selected from ferric salts and aluminum salts to the aqueous solution to be treated; steps a) and b) being carried out in any order and being carried out either separately, simultaneously or using a liquid composition including both the solubilized cationic starch and the metal salt, the steps a) and b) being followed: c) by a step of stirring the supplemented aqueous solution; d) by a step of separating the coagulated solids by sedimentation or floatation; e) by a step of recovering a purified water; the liquid composition including cationic starch having a viscosity, measured according to test A, higher than 1000 mPa·s. |
