METHOD FOR TREATING WATER BY WEIGHTED FLOCCULATION USING A FLOCCULATION AGENT OF NATURAL ORIGIN

摘要

Method for treating water by ballasted flocculation comprising a step for injecting into said water at least a flocculent, a step for injecting into said water at least one particulate material that is denser than water, and a step for retrieving treated water, characterised in that said ballasted flocculation is performed under agitating at a mean speed gradient between 100 and 1400 s-1 and in that said flocculent consists of at least one natural carbohydrate polymer having an anionic charge density between -900 and -4000 mueq/g.