Abstract
A kinetic study was carried out in a saline medium to assess the effect of O2 on the two-step nitrification process: for the first nitritation step, 2–26 mg dissolved O2 (DO) l−1 was used and for the second nitratation step, 0.5–24 mg DO l−1 was used. Nitritation rate was measured in the presence of sodium azide so as to inhibit nitratation. Ammonia-oxidizing (AOB) and nitrite-oxidizing (NOB) bacterial in the mixed culture were determined by 16 S rRNA hybridization. The affinity constants for oxygen O2 of the AOB and the NOB were 1.66 mg O2 l−1 and 3 mg O2 l−1 respectively. The larger than the previously reported values of these constants might be due to the high salt content in the medium. High O2 concentrations did inhibit the nitrification rate.
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Sánchez, O., Martí, M.C., Aspé, E. et al. Nitrification rates in a saline medium at different dissolved oxygen concentrations. Biotechnology Letters 23, 1597–1602 (2001). https://doi.org/10.1023/A:1011977629398
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DOI: https://doi.org/10.1023/A:1011977629398