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Evaluation of Field Application for the Developed Retrofitting Process and Analysis of Bacterial Community Structure in Pilot Plant  

Kim, Mee-Kyung (Department of Construction Environment Research, Korea Institute of Construction Technology)
Hong, Jun-Hyeok (Watershed Management Research Center, National Institute of Environmental Research)
Kim, Youn-Kwon (International Water Research Center, Korea Water Resources Corporation)
Ahn, Tae-Seok (Department of Environmental Science, Kangwon National University)
Shin, Eung-Bai (Council of Regional Environmental Centers)
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Abstract
In this study, a retrofitting BNR process that was modified for the economical applicability was proposed and evaluated in the pilot plant($50m^3/d$). At the same time the bacterial community structure was investigated in the pilot plant by using FISH(fluorescent in situ hybridization) method. Economically 16% of the initial construction cost for the proposed process(introduction of a biological nutrient removal process of $60,000m^3/d$ scale basis) was reduced due to the absence of a bioreactor. Water treatment efficiencies and maintenance facilities of the modified process were satisfied with the strengthened discharge permits in Korea throughout a long term pilot plant operating including a winter season. Bacterial populations in the pilot plant and in the control plant(A2/O process, B SIP(Sewage Treatment Plant)) were remained uniformly during the test period, but bacterial structure in the bioreactor was changed drastically. Proportions of ${\beta}$-proteobacteria group including soil bacteria which play a important role in wastewater treatment increased $25{\sim}607%$ in population.
Keywords
Advanced Wastewater Treatment; Bacterial Community Structure; FISH Method; Retrofit; Soil Microorganism;
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