Growth carriers from a technical deammonifying moving-bed WWTP were used in batch tests to determine possible N-conversion reactions under varying oxygen and substrate conditions. Deammonification, denitrification, and nitrification reactions could be proved using conventional analysis, combined with gas chromatography/mass spectrometry analysis to get additional information about 15N-isotope labelled gaseous end products of the different reactions. In this orientating study N2O could be observed in some cases up to 12% of the total gas production. N2O production came from incomplete denitrification processes under anoxic or oxygen-limiting conditions and in the absence of organic substrate. It seems as if structural components of deammonifying biofilms play a crucial role for the portion of side-reactions, leading to undesirable gaseous end products.
Balancing of nitrogen conversion in deammonifying biofilms through batch tests and GC/MS
T. Gaul, E. Filipov, N. Schlösser, S. Kunst, C. Helmer-Madhok; Balancing of nitrogen conversion in deammonifying biofilms through batch tests and GC/MS. Water Sci Technol 1 August 2002; 46 (4-5): 157–162. doi: https://doi.org/10.2166/wst.2002.0575
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