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Effects of DO concentration on Simultaneous Nitrification and Denitrification(SND) in a Membrane Bioreactor(MBR)
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 Title & Authors
Effects of DO concentration on Simultaneous Nitrification and Denitrification(SND) in a Membrane Bioreactor(MBR)
Park, Noh-Back; Choi, Woo-Yung; Yoon, Ae-Hwa; Jun, Hang-Bae;
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In this study, simultaneous nitrification and denitrification (SND) from synthetic wastewater were performed to evaluate dissolved oxygen(DO) effects on chemical oxygen demand(COD) and nitrogen removal in a single membarne bio-reactor(MBR). DO levels in MBR at Run 1, 2, and 3 were 1.9~2.2, 1.3~1.6, and 0.7~1.0 mg/L, respectively. Experimental results indicated that DO had an important factor to affect COD and total nitrogen(TN) removal. SND were able to be accomplished in the continuous-aeration MBR by controlling ambient DO concentration. It is postulated that, because of the oxygen diffusion limitation, an anoxic micro-zone was formed inside the flocs where the denitrification might occur. From the results of this study, 96% of COD could be removed at DO of 0.7mg/L. At run 2 72.92% of nitrogen was removed by the mechanisms of SND (7.75mg-TN/L in effluent). In this study, SND was successfully occurred in a MBR due to high MLSS that could help to form anoxic zone inside microbial floc at bulk DO concentrations of 1.3~1.6mg/L.
Biological nitrogen removal(BNR);Dissolved oxygen(DO);Membrane bio-reactor(MBR);Simultaneous nitrification and denitrification(SND);
 Cited by
동시 질산화-탈질(SND) 반응을 적용한 MBR 반응조에서 질소 및 인 제거 특성,전동걸;임현숙;안찬현;이봉규;전항배;박찬일;

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