基于响应面法优化的异相芬顿处理电镀废水有机络合物

Optimization of heterogeneous Fenton treatment of organic complexes in electroplating wastewater based on response surface methodology

为提高异相芬顿处理电镀废水的催化效率,优化工艺条件,采用邻苯二甲酸和盐酸缓冲溶液制备粉煤灰负载型异相芬顿催化剂,并分别研究催化剂投加量、初始pH值及H_(2)O_(2)投加量等单因素对电镀废水有机络合物的催化效率的影响及作用机制。在单因素实验的基础上,运用Box-Be-hnken Design响应面法优化实验设计,通过模型构建和方差分析,获得优化条件及多因素之间的交互作用,并验证模型的精准度。结果表明,各因素对电镀废水中CODCr去除率的影响作用排序为:初始pH值>催化剂投加量>H_(2)O_(2)浓度,初始pH值与H_(2)O_(2)浓度之间的交互作用较为显著;最优反应条件为:催化剂投加量16.86 g·L^(-1)、初始pH值3.49、H_(2)O_(2)浓度50.6 mmol·L^(-1),CODCr去除率实际值的平均值为94.2%,与预测值的相对误差仅为0.95%,说明采用该模型优化异相芬顿降解电镀废水中有机络合物是切实可行的。

In order to improve the catalytic efficiency and optimize the operating conditions of heterogene-ous Fenton process for electroplating wastewater treatment,a supported fly ash heterogeneous Fenton cata-lyst was prepared by using phthalic acid and hydrochloric acid as the buffer solution.And the effect of factors,such as catalyst dosage,initial pH value and H_(2)O_(2)dosage on the catalytic efficiency of organic complexes in electroplating wastewater were investigated,respectively.On the basis of single factor ex-periments,the Box-Behnken Design response surface methodology was used to optimize the experimental design,the optimized conditions and the interaction between multiple factors were obtained by model con-struction and variance analysis,and then the accuracy of the model was verified.The results show that the order of influence of various factors on the removal rate of CODCr in electroplating wastewater is as fol-lows:initial pH value>catalyst dosage>H_(2)O_(2)concentration,and the significant interaction occurred be-tween initial pH value and H_(2)O_(2)concentration.Moreover,the optimal reaction conditions are as follows:catalyst dosage 16.86 g·L^(-1),initial pH value 3.49,H_(2)O_(2)concentration 50.6 mmol·L^(-1).Furthermore,the average actual value of CODCr removal rate is 94.2%,which the relative error only 0.95%compared with predicted value.Therefore,it is feasible to optimize heterogeneous Fenton degradation of organic complexes in electroplating wastewater by response surface methodology.