基于响应面法优化电絮凝处理含砷冶炼废水的研究

Research on the response surface method applied to the optimized electrocoagulation used for the treatment of arsenic-containing smelting wastewater

利用电絮凝法处理含砷铜冶炼废水,采用单因素实验及响应面法对影响因素进行了研究,优化了处理条件,并运用XPS技术测定了固体中As、Fe的存在形式,探讨了作用机理。结果表明,响应曲面模型对电絮凝除砷行为拟合较好;在拟合的最佳条件下处理此冶炼废水,砷的去除率可达99%以上。XPS分析结果表明,固体中的Fe主要以Fe3+形式存在;部分As3+发生了氧化反应,生成了As5+。

Arsenic/copper-containing smelting wastewater has been treated by electro-coagulation process. The in- fluencing factors have been studied by single-factor tests and response surface method, and the treatment conditions optimized. The existing forms of As and Fe in solid have been determined by XPS techniques, and its action mecha- nisms discussed. The results show that the response curved surface model fits the arsenic removing behavior quite well. The arsenic removing rate can be above 99%, if the smelting wastewater is treated under optimal conditions fit- ted. XPS analysis results show that Fe in solid exists mainly in form of Fe3＋. Part of As3＋ has oxidation reaction and forms As5＋.