MINERAL COAGULANTS

Inorganic coagulants that are mainly used today are Iron Salts and Aluminum Salts.

The cationic charge necessary for the coagulation mechanism is brought by the iron and aluminum ions. These ions de-charge colloids, allowing the formation of small flocs due to “Brownian Motion”.

Usually, the flocs formed from the a/m process are not big enough to be removed from the solution. This is why the system must subsequently undergone flocculation by adding polyelectrolytes, a process during which larger flocs are created.

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