News & Events
Research Presentation
Speaker(s): Dr Nirakar PRADHAN
When: 14 November 2017 (9.00 AM)
Where: SCELSE, B3 Meeting Room - 1
Type: Environmental Engineering Group Meetings
Title: Modeling nitrite inhibition for the anaerobic ammonia oxidation (anammox) process
Abstract: In this study, we investigated the effect of nitrite on the nitrogen removal activity of an anammox process dominated by Ca. Brocadia sinica. Increasing the NO2-/NH4+ influent feed ratio experimentally beyond the theoretical stoichiometric ratio of 1.32 had a profound effect on nitrogen removal efficiency. The overall nitrogen removal rate (NRR) and specific anammox activity (SAA) decreased from 2.24 to 0.77 g-N/d and 1.07 to 0.37 g-N/g-VSS×d, respectively, when the influent NO2-/NH4+ ratio increased from 1.24 to 12.22. The experimental data were further evaluated by applying different substrate inhibition kinetic models. Haldane’s kinetic model was able to explain the nitrite inhibition observed in the anammox process with an R2 > 0.96 for NH4+ and an R2 > 0.85 for NO2- for all experiments.