| 초록 |
Natural Organic Matter (NOM) removal is an important issue in drinking water treatment processes. In this work, photodegradation of humic acids (HA) in aqueous solution was investigated using combined photocatalysis/ microfiltration systems. To improve the NOM removal efficiency in the hybrid system, the TiO2 surface was modified with iron oxide deposition. Fe impregnated on TiO2 could enhance the adsorptive removal of original and photocatalyzed NOM that was not readily decomposed into CO2. Total organic carbon and UV254 absorbance removal efficiency and transmembrane pressure were monitored during the experiments to evaluate NOM removal efficiency and membrane fouling. Various modification methods of the TiO2 surface, such as precipitation and photodeposition, have been tested using synthetic HA solutions at batch operation modes. Modification of TiO2 was influenced by the solution pH, dissolved oxygen level, and iron concentration. Aeration intensity was found one of the key factors to control membrane fouling, so air flow was optimized. Significant NOM removal efficiencies for lake and river waters were achieved using this combined system. |
