2020•International Journal of Environmental & Analytical ChemistryRequires access
Influence of operating conditions on the retention of severe industrial wastewater by nanofiltration
Boutheyna Aoufi, Mohamed Amine Didi, Abdelkrim Azzouz
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Abstract
The presence of metals in industrial wastewater is a major health risk in many places in the world. On pilot, the suitability of a thin film polyamide nanofiltration composite membrane (SNTE NF270-2540) to extract heavy metal ions (Zn, Cr, Cu, Fe, Cd, Pb, Co & Ni) from industrial wastewater was examined. The operating conditions including feed pH value, feed concentration and pressure were studied. The membrane was characterised by using the ions transport model and the consumption energy was calculated. The effect of ionic concentration and the diffusion fluxes were studied.The retention of Iron at pH = 5.3 and Nickel at pH = 7.2 and for pressures from 6.0 to 13.5 bars was quantitative (100%). For Lead at pH = 4.4 and for pressures from 6.0 to 10 bars, the retention was quantitative (100%).In general, the nanofiltration process is recommended to be applied in practice for the extraction of heavy metals from wastewater.