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논문 기본 정보

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학술대회자료
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대한환경공학회 대한환경공학회 학술발표논문집 대한환경공학회 2005년도 추계학술발표논문집
발행연도
2005.12
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1,528 - 1,532 (5page)

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Pilot-scale continuous flow duckweed-based ponds (DWBPs) were selected in this study as a dominant natural treatment system in respect to nitrogen removal, recovery and reuse suitable for developing countries. The study aimed to enhance system efficiencies especially on N removal and also to increase system stability, thus effluent recycles was introduced. A pilot-scale DWBPs was fed continuously with domestic wastewater, which had TN loading of approximately 10-60 kg ha(-1)d(-1) and COD loading of 19-120 kg ha(-1)d(-1). Six different treatment conditions were set by varying hydraulic retention time at 8 and 16 days, and each of that had effluent recycle rate (Influent : Effluent) at 1:0, 1:0.5 and 1:1 respectively. After comparing these operations, higher N removal efficiencies were significantly different in the system which had longer retention time and effluent recycles. The optimum operating condition was HRT 16 days with effluent recycles 1:1, in which the mean removals were 54% for TN, 72% for TKN and 73% for NH₄-N. It was found that the removal efficiencies of all N species had no obvious differences with effluent recycles, although they were differences in duckweed growth and system stability.

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