Activated carbon filtration

The physical method employed in the 14 sedimentation tanks is adsorption, i.e., adhesion of the material to be filtered to the surface of a solid, without a chemical reaction.
Activated carbon is the most adsorbent substance known at presentits highly porous structure increases the surface area in contact with the water.
In addition, as a result of preliminary ozonation of the water, granulated activated carbon encourages growth of a bacterial biomass which is involved in the removal of organic matter and ammonia.