Electrochemical treatment of diluted cyanide aqueous wastes

Journal of Chemical Technology and Biotechnology - Tập 80 Số 5 - Trang 565-573 - 2005
Pablo Cañizares1, M. Elena Poisot Díaz2, J. A. Domínguez2, Justo Lobato1, Manuel A. Rodrigo1
1Universidad de Castilla-La Mancha, Departamento de Ingeniería Química, Facultad de Ciencias Químicas, Campus Universitario s/n, 13071 Ciudad Real, Spain
2Instituto Superior Politécnico ‘José Antonio Echeverría’, Departamento de Ingeniería Química, Ave 114 No 11901 entre 119 y 127, CP 19390, Marianao, Ciudad de la Habana, Cuba

Tóm tắt

AbstractThe electrochemical oxidation of diluted cyanide aqueous wastes has been studied in a single compartment electrochemical flow cell. It has been determined that the anode material influences greatly the process's performance. Boron doped diamond and PbO2 anodes can oxidize these wastes in the presence of both sulfate or chloride anions. On the contrary, dimensional stable anodes cannot oxidize cyanide in sulfate‐containing wastewaters, and require the presence of chloride ions. The oxidation of cyanides leads to the formation of cyanate in a first step, and later to the formation of carbon dioxide and nitrogen. There is a net consumption of hydroxyl ions during the process. Energy consumptions in the range 20–70 kWh m−3 are required to decrease the initial pollutant load by 70–80%. Global current efficiencies in the range 3–8% are obtained. These low current efficiencies are justified by the low cyanide concentrations that the wastes used in this work contain. Copyright © 2005 Society of Chemical Industry

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Thông tin xuất bản

Journal of Chemical Technology and Biotechnology

Tập 80 Số 5

565-573

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