Chou Wei-Lung, Wang Chih-Ta, Huang Kai-Yu
Department of Safety, Health and Environmental Engineering, Hungkuang University, Sha-Lu, Taichung 433, Taiwan.
J Hazard Mater. 2009 Aug 15;167(1-3):467-74. doi: 10.1016/j.jhazmat.2009.01.008. Epub 2009 Jan 15.
The aim of this study is to investigate the effects of operating parameters on the specific energy consumption and removal efficiency of synthetic wastewater containing indium (III) ions by electrocoagulation in batch mode using an iron electrode. Several parameters, including different electrode pairs, supporting electrolytes, initial concentration, pH variation, and applied voltage, were investigated. In addition, the effects of applied voltage, supporting electrolyte, and initial concentration on indium (III) ion removal efficiency and specific energy consumption were investigated under the optimum balance of reasonable removal efficiency and relative low energy consumption. Experiment results indicate that a Fe/Al electrode pair is the most efficient choice of the four electrode pairs in terms of energy consumption. The optimum supporting electrolyte concentration, initial concentration, and applied voltage were found to be 100 mg/l NaCl, 20 mg/l, and 20V, respectively. A higher pH at higher applied voltage (20 or 30V) enhanced the precipitation of indium (III) ion as insoluble indium hydroxide, which improved the removal efficiency. Results from the indium (III) ion removal kinetics show that the kinetics data fit the pseudo second-order kinetic model well. Finally, the composition of the sludge produced was characterized with energy dispersion spectra (EDS).
本研究的目的是在间歇模式下使用铁电极通过电凝聚法研究操作参数对含铟（III）离子的合成废水的比能耗和去除效率的影响。研究了几个参数，包括不同的电极对、支持电解质、初始浓度、pH变化和施加电压。此外，在合理的去除效率和相对较低的能耗的最佳平衡下，研究了施加电压、支持电解质和初始浓度对铟（III）离子去除效率和比能耗的影响。实验结果表明，就能耗而言，Fe/Al电极对是四种电极对中最有效的选择。发现最佳支持电解质浓度、初始浓度和施加电压分别为100mg/l NaCl、20mg/l和20V。在较高的施加电压（20或30V）下较高的pH值增强了铟（III）离子作为不溶性氢氧化铟的沉淀，从而提高了去除效率。铟（III）离子去除动力学的结果表明，动力学数据很好地符合伪二级动力学模型。最后，用能量色散光谱（EDS）对产生的污泥的组成进行了表征。
