膜科学与技术

次氯酸钠清洗条件对PVDF微滤膜性能损伤的影响

作者：冯昆鹏，袁博，杨慎思，曾国倩，王新华，李秀芬

单位：江南大学环境与土木工程学院，无锡214122

关键词：次氯酸钠；膜损伤；聚偏氟乙烯；正交试验；层次分析

出版年,卷(期):页码： 2015,35(3):44-50

摘要：

为了了解次氯酸钠清洗对聚偏氟乙烯（PVDF）膜性能的损伤情况，借助正交试验和层次分析模型分析评价了清洗条件对PVDF膜性能的影响，并对清洗过程中PVDF膜面变红的现象进行了探讨．正交试验选择了清洗浓度、清洗时间和pH值3个清洗条件．结果表明，次氯酸钠的pH值对PVDF膜的平均孔径和比通量影响最大，清洗时间对接触角的影响最大，而次氯酸钠浓度对洗脱液的总有机碳（TOC）影响最大．借助层次分析模型获得了正交试验范围内对PVDF膜性能损伤最小的清洗条件为：清洗浓度0.1%，清洗时间25 h和pH值9．次氯酸钠清洗过程中，PVDF膜面颜色变红只与pH值有关，而与次氯酸钠浓度无关，这主要是由于高的pH值会造成制孔剂聚乙烯吡咯烷酮（PVP）的溶解和PVDF结构的变化．

Abstract：In order to further understand the membrane damage induced by the sodium hypochlorite cleaning, the orthogonal experiment and analytic hierarchy model were applied for investigating the influences of cleaning conditions on the perforamnce of PVDF microfiltration membranes commonly used in the membrane bioreactors. In the orthogonal experiment, the concentration of sodium hypochlorite, cleaning time and pH value were selected as the cleaning conditions, and the results indicated that the pH value had more significant impcats on the mean pore size and flux ratio of the PVDF membranes compared to other cleaning conditions. Furthermore, cleaning time and sodium hypochlorite concentrations significantly influenced the contact angle and TOC in the eluent, respectively. According to the method of analytic hierarchy process, the optimized cleaning conditions with the minimum damage on the performance of PVDF membranes were sodium hypochlorite concentration of 0.1 %, cleaning time of 25 h and pH value of 9. It should be pointed out that the PVDF membranes became red during the sodium hypochlorite cleaning when the pH value reached 12.7, which might be attributed to the dissolution of PVP and the variation of PVDF structure due to the high pH value. The results also indicated that this phenomenon was only due to pH value and did not have any relations with the sodium hypochlorite concentration.

冯昆鹏（1988-），男，河南人，硕士，学生，主要从事膜生物反应器研究，E-mail: fengkunpeng36@sina.com．*通讯联系人

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