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KMID : 0382420020280050042
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Korean Journal of Environmental Health Society
2002 Volume.28 No. 5 p.42 ~ p.52
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Characterizations of Assimilable Organic Carbon, Biodegradable Dissolved Organic Carbon, and Bacterial Regrowth in Distribution Systems by Water Treatment
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Chang Young-Cheol
Jung Kweon
Yoo Young-Sik
Kang Mi-Hye
Randall Andrew A.
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Abstract
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Two full-scale distribution systems. one treating water by ozonation and another treating water by nanofiltration in pamllel with lime softening. were monitored for bacterial growth. Both systems kept disinfectant residuals such as chlorine and chloramine in their respective distribution systems. Bacterial growth was assessed by heterotrophic plate counts (HPC) on R2A agar. In the distribution systems fed by ozonated water, HPCs were correlated (R2 = 0.97) using an exponential model with the assimilable organic carbon (AOC) at each sampling site. Also. it was observed that ozonation caused a signilicant increase in the AOC concentration of the distribution system (over 100% increuse) as well as a signilicant increuse in the bacterial counts of the distribution system (avemge increase over 100%). The HPCs from the distribution systems fed by nanofiltmtion in purallel with lime-softening water also displayed un exponential correlation (R2 = 0.75) with an exponential model based on AOC. No signilicunt correlation was found between bacteria growth on R2A agar and BOOC concentrations. Therefore, in agreement with previous work, bacterial growth in the distribution systems was found to correlate with AOC concentmtions.
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