响应曲面法优化新型电化学系统深度处理垃圾渗滤液生化出水

Landfill leachate treatment by novel electrochemical system:Optimization of experimental conditions by Response Surface Methodology

在以掺硼金刚石膜(boron-doped diamond,BDD)电极为阳极,碳毡材料为阴极的传统二维电化学系统中,在阴阳极板间引入感应铁电极,构建新型电化学系统,将系统用于垃圾渗滤液生化出水的深度处理研究.利用Box-Behnken(BBD)模型的响应曲面法(response surface methodology,RSM),考察电流密度、电解时间、p H值对出水COD及氨氮去除率的交互作用影响,并建立相关数学模型.结果表明,影响因子显著性顺序依次为:电解时间>电流密度>p H,模型回归性好,预测最大COD去除率为79.5%,氨氮去除率为97.8%,最佳实验条件为:电流密度0.1 A·cm-2,电解时间8.86 h,p H 10.86,实测结果为COD去除率78.0%,与预测值相比偏差为1.8%,氨氮去除率为94.2%,与预测值偏差为3.7%.由此可知,经响应曲面法优化后的实验方案可保证新型电化学系统处理垃圾渗滤液研究达到良好处理效果.

In the present study,a novel electrochemical system was constructed by introducing a sensing electrode of iron（ FeS） into a boron-doped diamond（ BDD） anode and a carbon felt（ CF）cathode to treat the effluent of biological treatment of landfill leachate. Response surface methodology（ RSM） with Box-Behnken（ BBD） statistical experiment design was used to optimize the experimental conditions. The influence of variables including current density,electrolytic time,and pH on COD and ammonia nitrogen removal efficiency was analyzed. Results revealed that the influence of electrolytic time was more important than current density and p H for both COD and ammonia nitrogen removal. The optimum conditions were 0. 1 A·cm^-2 current density,8. 86 h electrolytic time,p H 10. 86,with predicted values of COD removal efficiency（ 79. 46%） and ammonia nitrogen removal efficiency（ 97.82%）,respectively. These results revealed great potential for landfill leachate treatment by sensing electrode system.