Hou Juan, Shao Jia-Hui, He Yi-Liang
School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.
Huan Jing Ke Xue. 2010 Jun;31(6):1525-31.
With the deterioration of water pollution and stringency of water standards, ultrafiltration (UF) has become one of the best alternatives replacing conventional drinking water treatment technologies. However, UF is not very effectively to remove natural organic matter (NOM) due to the comparatively large pore size compared to the size of NOM. Fouling issue is another factor that restricts its widespread application. The rejection coefficient and flux decline during ultrafiltration of humic acid (HA) and raw water through neutral unmodified and negatively charge-modified regenerated cellulose (RC) membranes were investigated, and the analysis for membrane resistance was provided. The initial removal rate for HA is 59% and the flux decline is 32% on neutral unmodified RC membrane with MWCO of 100 x 10(3), while the initial removal rate for HA increases to 92% and the flux decline decreases to 25% on negatively charge-modified RC membrane. Compared to neutral unmodified RC membrane, the removal rate for NOM on negatively charge-modified RC membrane increases 20% and the flux decline decreases 12%. Results indicated that charged UF membrane could be an effective way for better removal of NOM and reduction of the membrane fouling due to the electrostatic interaction with the combination effect of membrane pore size.
随着水污染的加剧和水质标准的严格，超滤（UF）已成为取代传统饮用水处理技术的最佳选择之一。然而，由于超滤膜孔径相对于天然有机物（NOM）的尺寸较大，超滤去除NOM的效果不是很好。膜污染问题是限制其广泛应用的另一个因素。研究了腐殖酸（HA）和原水通过中性未改性和负电荷改性的再生纤维素（RC）膜超滤过程中的截留系数和通量下降情况，并对膜阻力进行了分析。对于截留分子量为100×10³的中性未改性RC膜，HA的初始去除率为59%，通量下降为32%；而对于负电荷改性的RC膜，HA的初始去除率提高到92%，通量下降降低到25%。与中性未改性RC膜相比，负电荷改性RC膜对NOM的去除率提高了20%，通量下降降低了12%。结果表明，由于膜孔径的综合作用与静电相互作用，带电超滤膜可能是更好地去除NOM和减少膜污染的有效方法。
