Nitrification kinetics in activated sludge at various temperatures and dissolved oxygen concentrations |
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Authors: | RC Charley DG Hooper AG McLee |
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Affiliation: | Imperial Chemical Industries Limited, Agricultural Division, Research and Development Department, Billingham, Cleveland, England |
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Abstract: | Activated sludge from a domestic sewage works was enriched with nitrifying bacteria by running a laboratory fermenter on ammonia-supplemented sewage. This enriched culture was used to determine respirometrically the kinetics of microbial nitrification. It was demonstrated that the reaction fits the Michaelis-Menten model for temperatures from 10 to 35°C, having a temperature optimum at 15°C (K3 0.72 mg 1−1 NH3). Nitrification is unaffected by high dissolved oxygen concentration 38 mg 1−1 O2 at 30°C) after acclimatisation. Nitrite concentrations > 20 mg 1−1 are inhibitory to the reaction. |
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