基于NaOCl扩散行为的膜清洗条件影响及优化

为了探究基于NaOCl扩散行为进行膜清洗的影响因素，建立完善的添加剂强化NaOCl扩散的新型膜清洗方法，本文以牛血清蛋白（BSA）、海藻酸钠（SA）作为模型污染物，通过批次膜清洗实验对膜面剩余污染物浓度、洗脱污染物粒径和膜面污染物形貌进行了测定分析和动态监控，探究不同活性氯（Cl_T）浓度，不同pH值及不同添加剂（十二烷基硫酸钠，SDS）浓度对强化扩散NaOCl清洗的影响，并对操作参数进行了优化，同时也验证了不同条件下的膜清洗机制.结果表明，在Cl_T浓度为200mg/L，pH值为11，SDS浓度为0.4mmol/L的条件下对膜面的清洗效率 > 95%.

Optimization of the influencing factor of membrane cleaning process based on the NaOCl diffusion

In this work, bovine serum albumin (BSA) and sodium alginate (SA) were used as model foulants to investigate the impact factors of membrane cleaning process based on the enhancement of NaOCl diffusion. The impact of the key parameters on cleaning efficiency was clarified, and a novel NaOCl cleaning method based on diffusion enhancement through additives was established. In batch membrane cleaning experiments, the effects of different concentrations of active chlorine, pH, and concentrations of SDS on the membrane cleaning process based on the diffusion enhancement of NaOCl were investigated by analyzing the residual foulants on membrane surface, the eluted foulant particle size and the dynamic morphology of the fouled membrane. The results confirmed the mechanisms under different cleaning conditions, showing that the membrane cleaning efficiency was over 95% at 200mg/L Cl_T, pH 11, and 0.4mmol/L SDS.