Several processes are currently available to treat effluents containing heavy metals, and from these, chemical precipitation, evaporation, ion exchange, membrane technologies and sorption processes can be highlighted. However, some more conventional processes are not suitable to perform the removal of low metal concentrations, which still represent damage both to the environment and to life. Therefore, processes that can be effectively used as tertiary or polishing treatments in order to remove metals and reduce their content to acceptable levels have been sought