响应面优化电芬顿法降解印染废水工艺研究

Optimization of eelectro-fenton process for degradation of printing anddyeing wastewater by response surface methodology

采用电芬顿法以亚甲基蓝溶液为印染模拟废水,降解率为评价指标,考察通电时间、pH、亚铁离子、过氧化氢投加量和电流(I)5个因素对其降解率影响。在单因素试验的基础上采取5因素3水平的响应面Box-Behnken中心拟合设计和分析试验,探究电芬顿降解亚甲基蓝最优降解工艺条件。试验结果表明电芬顿法降解亚甲基蓝印染模拟废水的最优工艺条件为:通电时间32.485 min、pH=3.486、亚铁离子投放量0.20 mmol、过氧化氢投放量0.682 mL,电流强度130.179 mA,并在该最优条件下进行3组平行验证试验得出亚甲基蓝溶液平均降解率97.3%,而模型预测值为98.4%,实测值与预测值相对偏差1.12%,可见响应面优化阴极电芬顿法降解印染模拟废水工艺模型可靠,具有一定的应用价值。

This article used the Electro-Fenton method to evaluate the degradation rate of printing and dyeing wastewater simulated with methylene blue solution,investigate the influence of five factors on the degradation rate of power-on time,pH,ferrous ion and hydrogen peroxide dosage,and current(I).Based on the single factor test,a 5-factor 3-level response surface Box-behnken center fitting design and analysis test were adopted to explore the optimal degradation process conditions for electro-Fenton degradation of methylene blue.The test results show that the optimal process conditions for the electro-Fenton method to degrade the simulated wastewater are:power-on time 32.485min,pH=3.486,ferrous ion dosage 0.20mmol,hydrogen peroxide dosage 0.682mL,current intensity 130.179mA,and Three sets of parallel verification tests were carried out under the optimal conditions,and the average degradation rate of methylene blue solution was 97.3%,while the predicted value of the model was 98.4%,and the relative deviation between the measured value and the predicted value was 1.12%.It can be seen that the process model of response surface optimizes cathodic electro-Fenton degradation of the printing and dyeing simulation wastewater is reliable and has certain application value.