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http://dx.doi.org/10.5338/KJEA.2009.28.4.371

Effects of DO concentration on Simultaneous Nitrification and Denitrification(SND) in a Membrane Bioreactor(MBR)  

Park, Noh-Back (National Academy of Agricultural Science, Rural Development Administration)
Choi, Woo-Yung (Department of Environmental Engineering, Chungbuk National University)
Yoon, Ae-Hwa (Department of Environmental Engineering, Chungbuk National University)
Jun, Hang-Bae (Department of Environmental Engineering, Chungbuk National University)
Publication Information
Korean Journal of Environmental Agriculture / v.28, no.4, 2009 , pp. 371-377 More about this Journal
Abstract
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.
Keywords
Biological nitrogen removal(BNR); Dissolved oxygen(DO); Membrane bio-reactor(MBR); Simultaneous nitrification and denitrification(SND);
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