| This study is to evaluate the characteristics of submerged biofilter process as pretreatment of raw water and alternative advanced water treatment system(AAWTS) composed with bioflitration, post-ozonation and GAC for Nakdong River by comparison of existing advanced water treatment system(EAWTS), composed with pre-ozonation, flocculation, sedimentation, sand filtration, post-ozonation and GAC. In the bioflitration process, the removal of turbidity, color, KMnO₄ consumption, NH₃-N and UV254 reached 98%, 95%, 70%, 72%, 79% respectively. The stable removal efficiency was obtained by the direct bioflitration after coagulant injection thought the influent was a muddy and highly polluted. The removal efficiency of the alternative advanced water treatment(AAWTS) using bioflitration process for turbidity, color, KMnO₄ consumption, NH₃-N and UV254 was reached 98.5%, 98%, 82%, 90%, 92% respectively. It is equivalent to the removal efficiency of existing advanced water treatment system(EAWTS) though the demanded area and coagulant of the alternative advanced water treatment system using bioflitration process was decreased about 60% and 70% respectively. |
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