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Characterizations of Assimilable Organic Carbon, Biodegradable Dissolved Organic Carbon, and Bacterial Regrowth in Distribution Systems by Water Treatment  

Chang, Young-Cheol (Civil and Environmental Engineering Department, University of Central Florida)
Kweon Jung (Division of Waste, Seoul Metropolitan Government Institute of Health and Environment)
Yoo, Young-Sik (Department of Environmental Engineering, Seoul Health College)
Kang, Mi-Hye (Division of Waste, Seoul Metropolitan Government Institute of Health and Environment)
Andrew A. Randall (Civil and Environmental Engineering Department, University of Central Florida)
Publication Information
Journal of Environmental Health Sciences / v.28, no.5, 2002 , pp. 42-52 More about this Journal
Abstract
Two full-scale distribution systems, one treating water by ozonation and another treating water by nanofiltration in parallel with lime softening, were monitored for bacterial growth. Both systems kept disinfectant residuals surf 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 ($R^2$= 0.97) using an exponential model with the assimilable organic carbon (AOC) at each sampling site. Also, it was observed that ozonation caused a significant increase in the AOC concentration of the distribution system (over 100％ increase) as well as a significant increase in the bacterial counts of the distribution system (average increase over 100％). The HPCs from the distribution systems fed by nanofiltration in parallel with lime-softening water also displayed an exponential correlation ($R^2$ = 0.75) with an exponential model based on AOC. No significant correlation was found between bacteria growth on R2A agar and BDOC concentrations. Therefore, in agreement with previous work, bacterial growth in the distribution systems was found to correlate with AOC concentrations.
Keywords
AOC (assimilable organic carbon); HPC (heterotrophic plate counts); BDOC (biodegradable dissolved organic carbon); THMs (trihalomethanes); Nanofiltration;
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