【作者】 王盼盼； 熊若晗； 王飞宏； 蒋海成； 马军；

【Author】 Panpan Wang;Ruohan Xiong;Feihong Wang;Haicheng Jiang;Jun Ma;State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology;

【机构】 城市水资源与水环境国家重点实验室哈尔滨工业大学环境学院；

【摘要】 水处理混凝上清液中残留的混凝剂常常黏附于超滤膜表面,成为膜污染的一种主要因子。相反地,这些残留的混凝剂颗粒在纳滤膜表面的动态沉积行为尚为研究,尤其是将其看作一种膜表面的原位改性手段。本文研究发现混凝上清液中残留铝盐水解产物以纳米颗粒形式存在,且具有增强纳滤膜去除双酚A及抗污染的功效。纳滤过程中,这些荷正电的铝盐水解颗粒动态黏附于荷负电的聚酰胺膜表面,从而提高了膜表面的亲水性和粗糙度,并通过SEM、AFM、接触角、表面流动电位等测试验证。实验结果表明,原位水解铝氧化物颗粒将纳滤膜对双酚A的截留率提高至88.5%,远高于单纯纳滤膜的60.7%。铝氧化物-腐植酸-双酚A纳米团簇与动态铝氧化物沉积层之间的正电荷排斥作用是双酚A截留率提高的主要贡献者。同时,动态铝氧化物沉积层的亲水特性也增强了纳滤膜的抗污染能力;通过三维荧光光谱表征,发现类蛋白物质是膜污染的主要成份。这种动态铝氧化物沉积层协同的纳滤膜也成功应用于处理实际受污染江水。更多还原

【Abstract】 Adhesion of residual coagulants onto ultrafiltration membrane surface is often considered as a fouling contributor. Oppositely, dynamic deposition of these particles during nanofiltration process has never been studied, especially as an in situ modulator of membrane surface characteristics. Herein, we found that in situ hydrolyzed aluminum particles were still residual in coagulated supernatants and enhanced bisphenol-A(BPA) removal and fouling-resistance performance of nanofiltration membrane. During nanofiltration process, these positively-charged aluminum-hydrolyzed particles dynamically deposited onto the negatively charged polyamide membrane surface and in turn improved membrane hydrophilicity and roughness, which were characterized by SEM, AFM, contact angle and streaming potential tests. Experimental results showed that in situ hydrolyzed aluminum particles improved BPA removal of nanofiltration membrane up to 88.5 %, more higher than the 60.7% of nanofiltration membrane. It was attributed to the positively-charged repelling interaction between aluminum-NOM-BPA clusters and dynamic aluminum particle deposition on membrane surface. Intrinsic hydrophilicity of the deposition also enhanced membrane fouling resistance and the dominate fouling contributors(protein-like substances) were identified by quantitative analyses of excitation emission matrix(EEMs) spectra. This dynamic deposition-assisted-nanofiltration performed excellent for the treatment of real river water.更多还原