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Characteristics of Nutrient Removal and Membrane Fouling in a Membrane Bioreactor using Food Waste as an Additional Carbon Source  

Ahn, Young-Tae (Department of Civil and Environmental Engineering, Korea Advanced Institute of Science and Technology)
Youn, Jong-Ho (Department of Environmental Information and Engineering, Shinsung College)
Chae, So-Ryong (Department of Civil and Environmental Engineering, Korea Advanced Institute of Science and Technology)
Shin, Hang-Sik (Department of Civil and Environmental Engineering, Korea Advanced Institute of Science and Technology)
Publication Information
Journal of Korean Society of Environmental Engineers / v.27, no.5, 2005 , pp. 519-524 More about this Journal
Abstract
Due to the low C/N ratio of domestic wastewater characteristic, addition of external carbon source for the effective N and P removal is necessary. High organic content of food waste can be used for the external carbon source in biological nutrient removal processes, The applicability of condensate of food waste (CFW), which is produced during the high-rate fermentation process, was examined in membrane bioreactor for the nutrient removal. Under the various operating conditions, nutrient removal efficiencies and membrane fouling characteristics were evaluated using synthetic wastewater. From nitrate utilization rate (NUR) test, denitrification rate was 0.19 g $NO_3-N/g$ VSS/day. With the addition of CFW increased, average removal efficiencies of T-N and T-P could be increased up to 64% and 41%, respectively. Also the optimal retention time was 3 hr/5 hr for anoxic/aerobic reactor. When applied to real sewage, membrane fouling resistance was increased up to 60%, which could be reduced from $10.4{\times}10^{12}m^{-1}$ to $5.9{\times}10^{12}m^{-1}$ with the control of influent suspended solid concentration. In summary, it was suggested that CFW could be used as an economical and effective carbon source for membrane assisted biological N and P removal.
Keywords
MBR; Nutrient Removal; Fouling; Food Waste;
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