| Title |
Characteristics of Granular Activated Carbon and Biological Activated Carbon Treatment Processes for Improvement of Drinking Water Quality |
| Authors |
최정우(Jeung Woo Choi),현길수(Kil Soo Hyun),강용태(Yong Tae Kang) |
| Abstract |
Nonbiodegradable organic carbon in the Nakdong river has been gradually increased due to the inflow of inappropriately treated domstic and industrial wastewaters. Most of the existing water treatment plants in the Nakdong river basin depend on rapid sand filtration process, which consists of prechlorination, coagulation-flocculation and sedimentation, rapid sand filtration processes. It has been inappropriate to produce good quality drinking water. 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 (UV_(254)), and trihalomethanes (THMs) removals. Based on the results of this research, the optimum empty bed contact time (EBCT) and packed depths of all the GAC and the BAC beds were 12 minutes and more than 320㎝, respectively. Conversion rates of dissolved organic carbon (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 and 10% and 14% for THMs, respectively. For TOC removal, the BAC bed was about 10% higher than the GAC. |