摘要
考察腐殖酸的污染和清洗过程对超滤膜表面Zeta电位的影响,协同膜通量的变化深入了解膜与腐殖酸间的作用机理,评估清洗过程的灵敏度,为评价超滤膜耐污染性和清洗效率提供一种新的有效手段。结果表明,在中性溶液条件下,PVDF超滤膜表面ζ<0,电性为负;随着腐殖酸质量浓度的增加,膜表面Zeta电位变得更负;随着Ca2+的添加,"盐桥"作用加速腐殖酸的吸附,膜通量下降,加重膜污染。经先0. 10 mol/L碱洗后1%(v/v)酸洗的方式可使膜通量恢复至90. 41%,较水力清洗和单一的酸清洗及碱清洗效果更佳,同时延长清洗时间,使膜表面Zeta电位变小。
The influence of humic acid pollution and the cleaning process on the Zeta potential of the ultrafiltration membrane surface was investigated.The change of the membrane flux was also studied to understand the mechanism of action between membrane and humic acid,and the sensitivity of the cleaning process was evaluated,which provides a new and effective means for evaluating the anti-pollution and cleaning efficiency of ultrafiltration membranes.The results showed that under the condition of neutral solution,the surface of PVDF ultrafiltration membrane hadζ<0,and the electrical conductivity was negative;As the mass concentration of humic acid increases,the Zeta potential of the membrane surface becomes more negative.The Zeta potential becomes more negative with the humic acid increased with the addition of Ca^2+,the“salt bridge”effect accelerates the adsorption of humic acid,resulting in decreased membrane flux,increased membrane fouling.After 1%(v/v)pickling with 0.10 mol/L alkali washing,the membrane flux can be restored to 90.41%,which is better than hydraulic cleaning and single acid cleaning and alkali cleaning,at the same time,the cleaning time is extended to make the Zeta potential of the membrane surface smaller.
作者
王旭亮
李宗雨
赵静红
潘献辉
郝军
WANG Xu-liang;LI Zong-yu;ZHAO Jing-hong;PAN Xian-hui;HAO Jun(The Institute of Seawater Desalination and Multipurpose Utilization,SOA(Tianjin),Tianjin 300192,China)
出处
《应用化工》
CAS
CSCD
北大核心
2018年第11期2336-2339,共4页
Applied Chemical Industry
基金
国家科技支撑计划项目资助(2014BAB06B00)
中央级公益性科研院所基本科研业务费专项资金项目资助(K-JBYWF-2015-T15)
新型海水淡化装备创新孵化平台(BHSF2017-20)
关键词
ZETA电位
超滤膜
腐殖酸
膜污染
膜清洗
膜性能评价
Zeta potential
ultrafiltration membrane
humic acid
membrane pollution
membrane cleaning
characterization of membrane performance
