Optimization of process variables for cadmium removal from synthetic wastewaters by sphagnum moss peat

Catalin Balan, Corneliu Cojocaru, Petru Bulai, Doina Bilba, Matei Macoveanu

Gheorghe Asachi Technical University of Iasi, Faculty of Chemical Engineering and Environmental Protection, Department of Environmental Engineering and Management, 71 Mangeron Blvd., 700050 Iasi, Romania

Abstract


The efficiency of Cd (II) removal from aqueous solutions was investigated using Sphagnum moss peat as sorbent. A 23 orthogonal central composite design was successfully employed for experimental design and analysis of results. The combined effect of the initial solution pH, peat dosage and initial Cd (II) concentration was studied and optimized using Response Surface Methodology (RSM). The optimum values of these variables were found to be pH = 4.72, 14.7 g peat /L and 13.64 mg Cd /L, respectively; in this point the removal efficiency is the maximum one (103.52 % given by empirical model and 99.9 % verified experimentally).

Keywords


cadmium removal; optimization; peat adsorbent; response surface methodology

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