Pozzo Salvani

Dearsenification plant serving a municipal aqueduct. It consists of pressure filters in carbon steel.

Technology used

Adsorption onto granular ferric hydroxide. This filter medium has the ability to permanently bind arsenic through an adsorption process.
Once bound, the arsenic is not released. Granular ferric hydroxide is able to retain arsenic with equal efficiency in both the oxidation states in which it occurs (arsenite and arsenate).