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http://dx.doi.org/10.11001/jksww.2018.32.6.527

Influence of C/N ratio on biofim growth in tap water  

Cho, Ji-Min (Kangwon National University, Department of Environmental Engineering)
Kim, Yeong-Kwan (Kangwon National University, Department of Environmental Engineering)
Publication Information
Journal of Korean Society of Water and Wastewater / v.32, no.6, 2018 , pp. 527-533 More about this Journal
Abstract
Microorganisms detected in the biofilm not only cause secondary pollution of drinking water such as taste, odor and pathogenic disease but also increase the amount of disinfectant due to microbial regrowth during the transportation of tap water. In this work, the influence of C/N ratio in tap water on the characteristics of biofilm growth was examined. The C/N ratio of the tap water sample was controlled at 100:5, 100:10, 100:20, 100:30, and 100:40 by adding appropriate amounts of dextrose and $(NH_4)_2SO_4$. Of the five C/N ratios, heterotrophic plate counts (HPC) was highest at the ratio of 100:10. Following the initial formation in all the five experimental conditions, natural detachment of the biofilm was observed. Extracellular enzyme activity (EEA) analyses showed that the change of the EEA during the experimental period was similar to that of the HPC, demonstrating a positive correlation between HPC and EEA. For TOC concentration in the tap water sample, approximately 75% of the TOC was consumed in 7 days of the experiment and 96% in 28 days. The TOC appeared to be relatively rapidly consumed at the initial phase of the biofilm growth. Consumption pattern of the ammonia nitrogen was different from the TOC consumption pattern showing the different role of ammonia nitrogen on the growth of biofilm.
Keywords
Biofilm; Tap water; C/N ratio; Heterotrophic plate count; Extracellular enzyme activity;
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