| In Nakdong river basin, most of the existing water treatment plants using the river water depend on rapid sand filtration process and it is not appropriated to produce drinking water because the pollution of water resource has been accelerated due to the discharge of domestic and industrial wastewaters to the river. Therefore, granular activated carbon (GAC) and biological activated carbon (BAC, ozone+GAC) were suggested as post-treatment process of the existing water treatment plant for improvement of the rapid sand filtrated water quality. Thus the objectives of this research are to optimize the operating conditions of the GAC and the BAC processes based on the results of total organic carbon (TOC), UV-254㎚ absorbance (UV254), and trihalomethanes (THMs) removals. The results of this research showed that optimum empty bed contact time (EBCT) of both the GAC and the BAC beds was 12 minutes. Conversion rates of dissolved organic compound (DOC) to biodegradable DOC (BDOC) by ozonation ranged from 22 to 30%. Effect of the BAC bed on BDOC and non-biodegradable DOC (NBDOC) removals averaged 44% and 19%, respectively. The removal percentage of the GAC and the BAC processes averaged 22% and 34% for TOC, 29% and 47% for UV254, and 10% and 14% for THMs, respectively. The BAC process was aproximately 10% higher than the GAC process except for THMs. |
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