A three factor,three-level Box-Behnken experimental design combining with response surface modeling (RSM) was employed for studied three independent variables contact time (T0), initial concentration (C0), and operating voltage (V0) in electrodialysis, taken desalination efficiency (Y) as response function,a mathematic model is established and optimized the operating conditions.The results show that p<0.000 1, R2=0.997 4 and CV=1.18% in the quadratic regression model, indicating that the model has a high degree of significance and accuracy.By the Pareto chart analysis, the operating voltage show the highest level of contribution to the model`s response value, and their interaction between initial concentration and operating voltage has the smallest contribution.The optimum conditions were determined to be Y=99.86% [T0=2.0 h, C0=100.1×10-6 (ppm), V0=18.43].By the result of verification experimental,predicted values was in excellent agreement with t the experimental values,the absolute error is less than 1%, it illustrated that the model can predict the actual process.The study showed that three factor, three-level Box-Behnken experimental design combining with response surface modeling (RSM) is a useful tool to investigate the factors influencing the electrodialysis efficiency, optimized the operating conditions,and realized the global optimal value.%利用三因素、三水平的Box-Bohnken实验设计和响应面法(RSM)对影响电渗析脱盐效率的三个主要因素停留时间(T0)、初始浓度(C0)和运行电压(V0)进行研究.以脱盐效率(Y)为响应函数,建立相应的数学模型,优化操作条件.实验结果表明,本研究所建立的三元二次数学模型的p<0.000 1、R2=0.997 4、CV=1.18%,说明该模型具有高度的显著性和精确性,能很好地预测电渗析的脱盐过程;分析帕累托图发现,运行电压对模型的响应值脱盐效率的贡献最大,初始浓度和运行电压的交互影响对脱盐效率的贡献最小,全局最大的脱盐效率为99.86%[停留时间为2.0 h、初始浓度为100.1×10-6(ppm)、运行电压为18.43 V];验证实验的实际值与模型预测值的绝对误差小于1%,说明建立的数学模型很好地预测电渗析脱盐的实际情况,具有较高的准确性.研究表明,利用三水平、三因素的Box-Bohnken设计及响应面法(RSM)研究影响电渗析脱盐效率的因素,能够优化操作条件,实现电渗析脱盐过程中的脱盐效率的最大化,说明该方法是分析电渗析脱盐效率的有效工具.
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