TY - JOUR
T1 - Outcompeting nitrite-oxidizing bacteria in single-stage nitrogen removal in sewage treatment plants
T2 - A model-based study
AU - Pérez, Julio
AU - Lotti, Tommaso
AU - Kleerebezem, Robbert
AU - Picioreanu, Cristian
AU - van Loosdrecht, Mark C M
PY - 2014/12/1
Y1 - 2014/12/1
N2 - This model-based study investigated the mechanisms and operational window for efficient repression of nitrite oxidizing bacteria (NOB) in an autotrophic nitrogen removal process. The operation of a continuous single-stage granular sludge process was simulated for nitrogen removal from pretreated sewage at 10°C. The effects of the residual ammonium concentration were explicitly analyzed with the model. Competition for oxygen between ammonia-oxidizing bacteria (AOB) and NOB was found to be essential for NOB repression even when the suppression of nitrite oxidation is assisted by nitrite reduction by anammox (AMX). The nitrite half-saturation coefficient of NOB and AMX proved non-sensitive for the model output. The maximum specific growth rate of AMX bacteria proved a sensitive process parameter, because higher rates would provide a competitive advantage for AMX.
AB - This model-based study investigated the mechanisms and operational window for efficient repression of nitrite oxidizing bacteria (NOB) in an autotrophic nitrogen removal process. The operation of a continuous single-stage granular sludge process was simulated for nitrogen removal from pretreated sewage at 10°C. The effects of the residual ammonium concentration were explicitly analyzed with the model. Competition for oxygen between ammonia-oxidizing bacteria (AOB) and NOB was found to be essential for NOB repression even when the suppression of nitrite oxidation is assisted by nitrite reduction by anammox (AMX). The nitrite half-saturation coefficient of NOB and AMX proved non-sensitive for the model output. The maximum specific growth rate of AMX bacteria proved a sensitive process parameter, because higher rates would provide a competitive advantage for AMX.
KW - Anammox
KW - Biofilm
KW - Granular sludge
KW - Mathematical modeling
KW - Microbial community interactions
KW - Nitritation
UR - http://www.scopus.com/inward/record.url?scp=84949116185&partnerID=8YFLogxK
U2 - 10.1016/j.watres.2014.08.028
DO - 10.1016/j.watres.2014.08.028
M3 - Article
AN - SCOPUS:84949116185
SN - 0043-1354
VL - 66
SP - 208
EP - 218
JO - Water Research
JF - Water Research
ER -