Journal
ENVIRONMENTAL TECHNOLOGY
Volume 23, Issue 3, Pages 353-362Publisher
SELPER LTD, PUBLICATIONS DIV
DOI: 10.1080/09593332508618419
Keywords
RBC; oxygen-limited; simultaneous nitrification-denitrification
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Rotating Biological Contactors (RBC) treating highly nitrogenous wastewaters are known to give rise to nitrogen losses, generally assumed to be due to concomitant nitrification and denitrification In this study, a lab-scale nitrifying RBC reactor was shown to bring about losses of nitrogen of the order of 10 to 20% at ammonium loading rates of up to 2129 mg N m(-2) d(-1), when no extra carbon source was added. These higher removal values could be due to Oxygen-Limited Autotrophic Nitrification and Denitrification (OLAND), because the reactor was operated at oxygen limitation. When methanol was added as a soluble organic carbon source to further diminish oxygen transfer into the deeper parts of the biofilm, the RBC achieved 84% nitrogen removal (loading rate 2300 mg N m(-2) d(-1)) at a COD/N ratio of 3.1. The latter also suggests that the OLAND process was occurring parallel to conventional denitrification.
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