[Effect of charged ultrafiltration membrane on natural organic matter removal and membrane fouling].
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.
Hou
Juan
J
School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China. jeera@163.com
Shao
Jia-Hui
JH
He
Yi-Liang
YL
D004563:Electrochemistry / Q000379:methods; D004868:Equipment Failure; D006812:Humic Substances / Q000032:analysis; D008567:Membranes, Artificial; D009930:Organic Chemicals / Q000302:isolation & purification*; D014462:Ultrafiltration / Q000379:methods*; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*; D018508:Water Purification / Q000379:methods*; D014881:Water Supply / Q000032:analysis
D006812:Humic Substances; D008567:Membranes, Artificial; D009930:Organic Chemicals; D014874:Water Pollutants, Chemical