Journal
BIOTECHNOLOGY LETTERS
Volume 36, Issue 3, Pages 547-551Publisher
SPRINGER
DOI: 10.1007/s10529-013-1397-x
Keywords
Anaerobic ammonium oxidation; Anammox; Free nitrous acid; Inhibition; Kinetics; Nitrite
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Funding
- University of Arizona Water Sustainability Program
- National Science Foundation [CBET-1234211]
- Spanish Ministry of Education, the USA Council
- Spanish Fulbright Commission
- Div Of Chem, Bioeng, Env, & Transp Sys
- Directorate For Engineering [1234211] Funding Source: National Science Foundation
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Nitrite is a substrate but also an inhibitor of anaerobic ammonium oxidation (anammox).There is currently no consensus on whether ionized nitrite (INi) or free nitrous acid (FNA) is the actual inhibitor of the process. The inhibition by INi and FNA on the anammox process has been analysed using a wide range of INi and FNA concentrations and by altering the pH and total nitrite conditions. The inhibitory impacts of both species were quantified through a rational inhibition equation, considering INi and FNA as substrate inhibitor and non-competitive inhibitor, respectively. Inhibitory constants were calculated with strong statistical support as 561 mg INi-N l(-1) and 0.117 mg FNA-N l(-1). Based on the model, INi is the main inhibiting species of the anammox process at pH > 7.1, which are the most common conditions occurring in field applications of anammox.
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