Inhaltszusammenfassung

The performance of an electrocoagulation system for Ni, Cu and Cr removal from a galvanic wastewater in laboratory scale was studied systematically. Several parameters - such as electrode material and arrangement, initial pH, charge loading and applied current - and their influence on the cleaning results and on the electrocoagulation efficiency were investigated. The results with the galvanic wastewater (2g/l Ni, 2.5g/l Cu and 0.7g/l Cr at pH 1.5) revealed that the best cleaning results and ...The performance of an electrocoagulation system for Ni, Cu and Cr removal from a galvanic wastewater in laboratory scale was studied systematically. Several parameters - such as electrode material and arrangement, initial pH, charge loading and applied current - and their influence on the cleaning results and on the electrocoagulation efficiency were investigated. The results with the galvanic wastewater (2g/l Ni, 2.5g/l Cu and 0.7g/l Cr at pH 1.5) revealed that the best cleaning results and the most effective removal could be achieved with a combination of Fe- and Al-electrodes and an pH(initial) >5.0. This approach combined the advantages of both the single set-ups: the pH increase with the AI-electrodes at high currents, the possibility of a Cr(VI)-reduction by Fe(2+) and probably a better co-precipitation by Al- and Fe-hydroxides, respectively. An increase of the current accelerated the removal process. With Fe-electrodes at 0.2 A, Al-electrodes at 1.5 A and pH(initial) of 5.0, the residual metal concentrations after 180 min were 1.5 mg/l Cr, 6.5 mg/l Cu and 65.3 mg/l Ni at a power consumption of 9.0 kWh/m(3). (C) 2009 Elsevier B.V. All rights reserved. » weiterlesen» einklappen

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