The use of catalytic ozonation and fluidized bed reactor for the control of disinfection by-products.

in International Symposium (poster summary), 國際研討會(摘要海報發表)
標題The use of catalytic ozonation and fluidized bed reactor for the control of disinfection by-products.
AuthorsKuan-chung Chen, 陳冠中, Yuan-huang Chang 張源煌, M.F. Shue 許美芳, & C.C. Wu 吳志超
出版日期Apr 18 2008 12:0
會議地點Lotte Hotel, Jeju Island, South Korea.

The Dong-Gang River (DGR), which is polluted by domestic and agricultural wastewater, is located in the southwest of Taiwan. A high dosage of prechlorination is added in the water treatment plant to control the water quality, which sometimes results in the violation of maximum contaminant level (MCL) for the total trihalomethanes (TTHMs) in the treated water. Currently, the treated water of DGR is the source of industrial water supply but not for the public. The public concerns over the formation of disinfection by-products (DBPs) in the treated water of DGR mainly due to their carcinogenic properties.
The combination system of catalytic ozonation and fluidized bed reactor (FBR) was used to investigate the removal efficiency of disinfection by-products precursors in the DGR water. In the system, a FBR was used as the ozone contactor and the catalysts which were made of TiO2/Al2O3 were used as the fluidized support media in the FBR. The advantage of this design is to maximize the contact surface between ozone and catalysts to improve the formation of hydroxyl radicals and also to avoid clogging problem occurred in the reactor. Catalytic ozonation/FBR resulted in a reduction of up to 35% and 71% in the dissolved organic carbon (DOC) concentration and UV254, respectively. This system also decreased the concentration of simulated distribution system total trihalomethanes (SDS TTHMs) and simulated distribution system haloacetic acids (HAA6) by up to 40% and 53%, respectively. Eight ozonation by-products, which can be effectively removed by biological treatment, were categorized into aldehydes, ketones and keto acids and were also monitored. All these ozonation by-products increased significantly after treated by the system. The concentrations of aldehydes and ketones were independent of the weight of added catalysts. However, the concentration of keto acids decreased as the addition amount of catalyst increased. The concentrations of DOC, UV254, chlorinated DBPs, and ozonation by-products are expected to be further lowered if a biological treatment unit follows the catalytic ozonation/FBR system.

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