Abstract

In the present paper, the lignocellulosic residues from the olive oil industry in South-EastItaly, namely BOP (Biosorbent from Oil Production), were used as sorbents for heavy metalsretention (Pb+2, Cd+2, Ni+2) in water and wastewater treatments.To the purpose, thermodynamic and kinetic investigations for single and multispeciessystems were carried-out through batch equilibrium isotherms and column dynamic exper-iments.In the case of batch tests, maximum metals retentions (qmax) in single ion solutionswere 22.4 mg/gBOP, 10.5 mg/gBOP, 5.04 mg/gBOPrespectively for Pb+2, Cd+2and Ni+2, lower fig-ures were detected in the case of ternary systems with values exceeding 10.51 mg/gBOP,5.11 mg/gBOP, 3.81 mg/gBOPrespectively. Further drastic reductions were detected in tapwater. Langmuir and Freundlich isotherms led to good correlations of the data in single-ionand ternary solutions in demineralized water. Freundlich isotherms gave better correlationin tap water.In the case of column tests, operating capacities resulted in the same order withPb+2> Cd+2> Ni+2.After retention, the exhausted metal converted materials were included into cementconglomerates for a possible employment in the building industry applications, thus mini-mizing their potential environmental impact.

Full paper: https://www.sciencedirect.com/science/article/pii/S0957582017304135