Kinetics of Nitrosomonas europaea at extreme substrate,product and salt concentrations |
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Authors: | J H Hunik H J G Meijer J Tramper |
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Institution: | (1) Department of Food Science, Food and Bioprocess Engineering Group, Agricultural University, Wageninge, P. O. 8129, 6700 EV Wageningen, The Netherlands |
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Abstract: | Summary Nitrification of ammonia in concentrated waste streams is gaining a lot of attention nowadays. Nitrosomonas europaea is the predominant ammonia-oxidizing species in these environments. Prediction of the behaviour of a pure culture of N. europaea (ATCC 19718) under conditions prevailing in concentrated waste streams was the aim of this study. The initial oxygen consumption rate of a concentrated cell suspension was used as a rapid assay to measure the effects on N. europaea under various conditions. Several relationships, based on Michaelis-Menten kinetics, were derived. They describe the behaviour of N. europaea at substrate (NH4
+), product (NO2
– and K+, Na+, SO
inf4
sup2–
, NO3
–, Cl–) concentrations up to 500 mol/m3 and pHs ranging from 6.5 to 8.5. High concentrations of ions inhibited N. europaea but specific substrate inhibition was not observed. Product inhibition was strongly pH-dependent and severe inhibition was found at pH 6.5.
Correspondence to: J. H. Hunik |
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Keywords: | |
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