process for treating an aqueous effluent, uses of at least one modified natural cationic polymer and at least one modified natural anionic polymer and compositions

摘要

The invention relates to the treatment of mine tailings in the form of aqueous effluents comprising solid particles. With the process of the invention it is possible to separate all or part of the water from an aqueous effluent comprising solid particles. This process comprises (a) adding to the effluent at least one modified natural anionic polymer selected from anionic guar gums and / or anionic starches, then (b) adding at least one modified natural cationic polymer selected from cationic starches and / or cationic dextrans and / or cationic chitosans. The invention also relates to a composition comprising an aqueous effluent comprising solid particles treated with a modified natural anionic polymer and a modified natural cationic polymer. preferably, it relates to a composition comprising an aqueous effluent comprising solid particles, at least one modified natural anionic polymer selected from anionic guar gums and / or anionic starches, and at least one modified natural cationic polymer selected from cationic starches. and / or cationic dextrans and / or cationic chitosans.