The coagulants, whether mineral or organic, have active groups : cationic charges (+).

These cationic charges offer a high degree of affinity for the surface of very fine and colloidalparticles in suspension in the water that are surrounded by opposite electrical charges (-).

The cationic charges supplied by the addition of coagulant contribute towards the reduction of the repulsive electrical forces through the neutralization of the charges around each colloidal particle.

This neutralization of the charges leads to a destabilization of the very fine particles, which results in an agglomeration of the particles. These agglomerates are then called flocs or microflocs.

The flocs, which are composed of a large number of elementary particles, will be easier to extract from the treated suspension.

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