School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai, PR China.
Water Res. 2011 Jan;45(2):473-82. doi: 10.1016/j.watres.2010.09.006. Epub 2010 Sep 15.
Increasingly stringent regulations for drinking water quality have stimulated the ultrafiltration (UF) to become one of the best alternatives replacing conventional drinking water treatment technologies. However, UF is not very effectively to remove humic acid due to the comparatively larger pore size compared to the size of humic acid. Fouling issue is another factor that restricts its widespread application. In this study, rejection of humic acid and flux decline were compared with essentially neutral, negatively charged version of a regenerated cellulose membrane, in which electrostatic interaction was explored for a better humic acid removal and less fouling. Solution environment, including ionic strength, pH and calcium ion concentration, affecting humic acid removal and flux decline on negatively charged and neutral membranes was also compared. Results indicated that the appropriate charge modification on the neutral UF membrane could be an effective way for better removal of NOM and reduction of the membrane fouling due to the electrostatic interactions with the combination effect of membrane pore size. Electrostatic interactions are significant important to achieve high humic acid removal and less fouling, and to improve the water quality and protect people's health.
日益严格的饮用水水质法规刺激了超滤（UF）成为替代传统饮用水处理技术的最佳选择之一。然而，由于 UF 的孔径相对较大，与腐殖酸的大小相比，UF 对腐殖酸的去除效果并不十分理想。结垢问题是限制其广泛应用的另一个因素。在这项研究中，通过比较基本中性、带负电荷的再生纤维素膜的腐殖酸截留率和通量下降率，探讨了静电相互作用对腐殖酸去除和结垢减少的影响。还比较了溶液环境（包括离子强度、pH 值和钙离子浓度）对带负电荷和中性膜上腐殖酸去除和通量下降的影响。结果表明，对中性 UF 膜进行适当的电荷修饰是去除 NOM 的有效方法，并且由于与膜孔径的组合效应的静电相互作用，可以减少膜污染。静电相互作用对于实现高腐殖酸去除和低结垢、提高水质和保护人们健康非常重要。
