Wastewater Purification By Nanofiltration Technology

The removal of two different heavy metals in aqueous solutions was investigated with polyamide nanofiltration membrane, the results show that the rejection of iron ions is total (100%). Depending of the experimental condition the retention of copper are varied from 82% to 94%.It was observed that the pH has no influence in the iron rejection. The rejection of ions by nanofiltration is done by Donnan effect (electrostatic repulsion) and counter-ion volume effect (steric exclusion).