BDD电极电解印染RO浓水的响应面优化研究

Response Surface Optimization in Electro-Oxidation of Printing and Dyeing Reverse Osmosis Wastewater by the BDD Electrode

结合杭州市萧山区某印染厂现有工艺,采用BDD电极深度处理印染RO浓水,并采用Box-Behnken响应面法分别探讨了电流密度、pH和电极间距对COD去除率的影响规律。结果表明,各因素显著性顺序为:电流密度(B)>pH(A)>极板间距(C);同时各因素交互作用显著。建立了以COD去除率作为响应值的二次回归模型,在最佳反应条件pH=6.53,电流密度为20.68 mA/cm^(2),电极间距为2.09 cm的条件下,预测COD去除率为96.0934%,与实验值(97.16%)偏差仅为0.006%,表明该模型对电解处理印染废水工艺优化具有一定的可行性,同时为印染RO浓水的深度处理提供参考。

Combined with the existing process of a printing and dyeing factory in Xiaoshan District,Hangzhou,BDD electrodes are used to deeply treat concentrated water after RO process,and the Box-Behnken response surface method was used to investigate the influence of current density,pH value and electrode spacing on COD removal rate.The results showed that the order of significance of each factor is:current density(B)>pH(A)>electrode spacing(C);meanwhile,the interaction of each factor is significant.A quadratic regression model with COD removal rate as the response value was established.Under the optimal reaction conditions of pH=6.53,current density of 20.68 mA/cm^(2),and electrode spacing of 2.09 cm,the predicted COD removal rate was 96.0934%,which was consistent with the experimental value(97.16%)deviation was just 0.006%,indicating that the model has certain feasibility for the optimization of advanced treatment of printing and dyeing wastewater,and at the same time provides a reference for advanced treatment of printing and dyeing RO concentrated water.