响应面法优化Fenton处理难降解反渗透垃圾浓缩渗滤液

Optimization of Fenton process for biorecalcitrant concentrated leachate of reverse osmosis(RO) by response surface methodological analysis

采用了基于中心复合设计(CCD)的响应面分析方法(RSM)研究了Fenton试剂处理难降解反渗透垃圾浓缩渗滤液过程中初始pH、FeSO4.7H2O用量、[H2O2]/[Fe2+]摩尔比3个因素对浓缩液中COD去除率的影响。由Design Ex-pert 7.1软件设计分析实验数据,得到了一个二次响应曲面模型,模型具有较高的回归率(R2=0.9699),与实验结果吻合程度较高。该模型显示COD的去除率与3个因素之间不是简单的单调函数关系,它们彼此之间存在一个最佳数值而使去除率达到最高。H2O2与Fe2+之间具有很强的相互增效作用,COD的去除由氧化作用和混凝作用共同完成。在最佳pH值为3.75,FeSO4.7H2O投加量为17.91 mmol/L、[H2O2]/[Fe2+]摩尔比为1.36的反应条件下,COD去除率能达到最高值(72.25%)。

The effects of operating conditions on COD removal efficiency of biorecalcitrant concentrated landfill leathate of reverse osmosis（RO） in Fenton＇s oxidation process were investigated by using response surface methodology（RSM） and central composite design（CCD）.The reaction factors of pH value,FeSO4·7H2O concentration,/ molar ratio were studied.Using the software of Design-Expert 7.1,a response surface quadratic model in terms of actual factors was obtained based on the experimental data.H2O2 and Fe2＋ had a synergistic effect on the removal of organic residues and COD was removed by both oxidation and coagulation.The optimum pH value,FeSO4·7H2O concentration and / molar ratio were found to be 3.75,17.91 mmol/L and 1.36,respectively and the highest COD removal efficiency（72.25%） could be achieved.