Olmez Tugba
Department of Environmental Engineering, Istanbul Technical University, ITU Insaat Fakültesi, TR-34469 Maslak Istanbul, Turkey.
J Hazard Mater. 2009 Mar 15;162(2-3):1371-8. doi: 10.1016/j.jhazmat.2008.06.017. Epub 2008 Jun 13.
In this study Response Surface Methodology (RSM) was employed to investigate the effects of different operating conditions on the removal of hexavalent chromium (Cr(VI)) by the electrocoagulation with stainless steel electrodes. Central Composite Design (CCD) was used for the optimization of the electrocoagulation process and to evaluate the effects and interactions of process variables: applied electric current, electrolyte concentration and application time on the removal of Cr(VI). A sample of metal finishing industry wastewater having a high Cr(VI) concentration of 1470 mg/L was used in the experimental study. The optimum conditions for complete (100%) Cr(VI) removal were established as 7.4A applied electric current, 33.6 mM electrolyte (NaCl) concentration and 70 min application time. The amount of sludge produced under the conditions optimized based on the results from the model was lower than the amount generated by chemical treatment with FeSO(4).7H(2)O and non-hazardous in nature.
在本研究中，采用响应面法（RSM）研究了不同操作条件对不锈钢电极电凝聚去除六价铬（Cr(VI)）的影响。采用中心复合设计（CCD）优化电凝聚过程，并评估工艺变量（施加电流、电解质浓度和施加时间）对Cr(VI)去除效果的影响及相互作用。实验研究使用了Cr(VI)浓度高达1470 mg/L的金属加工工业废水样本。确定了完全去除（100%）Cr(VI)的最佳条件为：施加电流7.4A、电解质（NaCl）浓度33.6 mM、施加时间70分钟。根据模型结果优化条件下产生的污泥量低于用FeSO(4)·7H(2)O进行化学处理产生的污泥量，且本质上无害。
