Optimization of Fenton and electro-Fenton oxidation of biologically treated coking wastewater using response surface methodology
Optimization of Fenton and electro-Fenton oxidation of biologically treated coking wastewater using response surface methodology
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DOI：
10.1016/j.seppur.2011.08.023
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发表时间：
2011-10
影响因子：
8.6
通讯作者：
Xiaobiao Zhu;Jinping Tian;Rui Liu;Lu-jun Chen
中科院分区：
文献类型：
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作者：
Xiaobiao Zhu;Jinping Tian;Rui Liu;Lu-jun Chen
本研究采用Fenton和电Fenton组合工艺处理生物稳定焦化废水，即焦化废水生物处理出水。采用Box-Behnken试验设计(BBD)和响应面法(RSM)对两种工艺的性能进行了设计和优化。建立了Fenton法和电Fenton法对TOC去除效果的二次回归模型，并用方差分析(ANOVA)对模型进行了验证。得到了反应参数对过程效率的线性效应和交互作用的显著水平。Fenton反应的最佳工艺参数为：pH值为4，反应时间为1.2 h，Fe2+和H_2O_2的投加量为40 mM，电Fenton反应的pH值为4，反应时间为1.8 h，Fe~(2+)的投加量为0.6 mM，电流密度为3.7 mA/cm~2。Fenton和电Fenton对TOC的去除效率分别为75%和55%左右。Fenton法和电Fenton法对焦化废水的深度处理都是有效的，响应面方法适用于工艺的设计和优化。
In this study, Fenton and electro-Fenton were employed to treat biologically stabilized coking wastewater, i.e. the effluent of a biological coking wastewater treatment. The Box–Behnken experimental design (BBD) and response surface methodology (RSM) were used to design and optimize the performance of both processes. The regression quadratic model describing the TOC removal efficiency of Fenton and electro-Fenton process was developed and validated by the analysis of variances (ANOVA), respectively. The significance levels of linear and interaction effects of the reaction parameters on processes efficiencies were obtained. The optimum parameters were determined as pH 4, 1.2h reaction time, 40mM of Fe2+and H2O2for Fenton reaction; and pH 4, 1.8h reaction time, 0.6mM of Fe2+and 3.7mA/cm2of current density for electro-Fenton. The corresponding TOC removal efficiencies were about 75% and 55% for Fenton and electro-Fenton, respectively. Both Fenton and electro-Fenton are effective in advanced treatment for coking wastewater, and the response surface methodology is suitable for the design and optimization of the processes.