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Simultaneous Nitrification and Denitrification in the Fixed Biofilm Process using Ceramic Media  

Lee, Tae-Kyoung (Department of Geoenvironmental System Engineering, Hanyang University)
Park, Jai-Koo (Department of Geoenvironmental System Engineering, Hanyang University)
Han, Gi-Bong (Department of Water Quality Research, National Institute of Environmental Research)
Publication Information
Journal of Korean Society of Environmental Engineers / v.24, no.6, 2002 , pp. 1105-1115 More about this Journal
Abstract
The removal characteristic of nitrogen and organic materials in artificial wastewater was studied with the fixed biofilm developed on a ceramic packing media. Especially, this study was focused on the feasibility of simultaneous nitrification and denitrification(SND). The ceramic media was packed to be 30%, 45%, 60% and 70% to investigate a variation of removal efficiency in the reactor. The activated sludge reactor was operated as a control. The organic removal efficiency didn't show large difference among variable packing ratios. but was sustained to be more than 90% in the reactors with 60% and 75% packing ratios, respectively. The 10% of nitrogen removal was same with the activated sludge reactor and average removal efficiencies with regard to each packing ratio were 25%, 25%, 36% and 52%, respectively. Also, SND efficiency was 10% in the activated sludge reactor and showed 35%, 34%, 49% and 71% according to each packing ratio, respectively. The net $NO_3-N$ removal rates was increased from 12.5 mg/L/d to 43.9 mg/L/d accordance with increasing media packing ratios from 30% to 75% in activated sludge reactor. Therefore the ceramic media is expected to do a major role for the formation of aerobic and anoxic zones in the reactor. The optimum packing ratio was 60% to remove SS and organic materials. but the highest removal efficiency of SND and nitrogen was achieved at 75%.
Keywords
Simultaneous Nitrification and Denitrification(SND); Fixed Biofilm Reactor; Ceramic Media;
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