| Title |
The Formation of Assimilable Organic Carbon ( AOC ) in Ozonated Water and the Determination of AOC with Achinetobacter calcoaceticus |
| Authors |
강준원 ; 김종배 ( Joon Wun Kang ; Jong Bae Kim ) |
| Abstract |
The effect of ozone application in the drinking water on the production of assimilable organic carbon (AOC) was evaluated. The typical procedure to determine AOC is suggested by van der Kooij, which is the method of bacterial growth measurement by colony forming units using the strain P17 and/or NOX. The bacterial indicator species used for this study is Acinetobncter calcoaceticus which was isolated and identified ozonating the Nakdong river water. This strain could never be isolated from the raw water, but this strain was the predominant isolate in the ozonated water. Within a short incubation time, this organism was found to replicate well on acetate and oxalate as a sole carbon source. The yield coefficient of this organism for acetate and oxalate are the same order of magnitude of the value of P17 and NOX. The advantage of AOC determination using A. calcoaceticus might be the shortening of assay time due to the more rapid growth of this organism compared with that of P17 and NOX. With the full scale experiments, A.calcoaceticus was found to increase after ozonation, but did not decrease upon chlorination. The addition of biological treatment process such as biological activated carbon (BAC) filters after post-ozonation may appear to be an ideal solution to reduce the AOC concentration. |