A modified electrodialytic cell to recover heavy metals from wastewater

N.S. Abo-Ghander, S.U. Rahman*, S.M.J. Zaidi

Electrochemical Research Group, Chemical Engineering Department, King Fahd University of Petroleum & Minerals, Dhahran-31261, Saudi Arabia

 

Abstract

A modified electrodialytic cell integrates electrodialysis and reduction of metal ions. The cell is able to recover metallic copper from wastewater containing 1000 ppm cupric ions and bring the concentration down to about 1 ppm. The kinetic data of decreasing copper ion concentration fit well in first order kinetics and allow calculation of the over all reaction rate constant. Effect of several parameters, namely, width of wastewater compartment, applied potential and concentration of anolyte and catholyte solution; on the over all reaction rate constant and specific energy consumption were studied. The best combination of parameters results in an overall rate constant of 7.84 × 10^-4 sec^-1 and specific energy consumption of 48.18 kW-h/kg copper.

Keywords: electrodialysis, electrolysis, copper ions, wastewater, water treatment.

 

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*Corresponding author. E-mail address: srahman@kfupm.edu.sa