维生素C(维C)废水排放量大、有机物浓度高、盐度高,采用纳滤膜对其进行深度处理可提高水资源回用率.本研究选用型号为NFW的纳滤膜,膜进水COD、TOC和电导率的平均浓度为160mg/L、18.21mg/L和18.62ms/cm,COD和TOC去除率为93.75%和95.67%,脱盐率为38.01%.本研究采用响应面法,分析了膜运行主要操作条件(操作压力,P;温度,T;进水流量,Q)与膜污染评价指标(膜通量和污染指数)的关联性并建立了拟合方程,在此基础上获得了最优操作条件.结果表明:关于膜通量和污染指数的二次拟合方程,决定系数(R2)分别是97.53%和90.04%,拟合结果良好.该拟合方程获得的纳滤膜处理维C废水的最优操作条件为:压力P=966kPa,温度T=24℃,进水流量Q=456L/h.实验验证结果表明,上述最优操作条件结果可靠,

 Vitamin C wastewater with high concentrations of organic matter and salinity emissions a great quantity, so it is of great significance to reuse it. The average concentration of COD, TOC and conductivity is 160mg/L, 18.21mg/L and 18.62ms/cm. The removal of COD, TOC and desalination is 93.75%, 95.67% and 38.01%. The quality of the permeate water has reached the reclaimed water quality. By means of the Box-Behnken response surface methodology experiment, influence significance and interactions of three factors (operating pressure, P; feed temperature, T; feed flow rate, Q) were study, and regression models were established to control membrane fouling in vitamin C wastewater reclamation. The optimum conditions of NFW membrane were pressure of 966kPa, T of 24℃ and feed flow rate of 456L/h. The experiment results show that the optimum fits the real results.

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