TY - JOUR
T1 - Stability of the ANAMMOX process in a gas-lift reactor and a SBR
AU - Dapena-Mora, A.
AU - Campos, J. L.
AU - Mosquera-Corral, A.
AU - Jetten, M. S.M.
AU - Méndez, R.
N1 - Funding Information:
The present research was financially supported by the European Commission project ICON (Ref. EVK1-CT-2000-00054ICON), Xunta de Galicia (PGIDT10XJ 120904 PM) and the Spanish CICYT which funded this research through the Oxanamon project (PPQ-2002-00771). Ana Dapena wants to thank the Spanish Ministry of Education and Culture for her grant.
PY - 2004/5/27
Y1 - 2004/5/27
N2 - In the last years, the ANAerobic AMMonium OXidation (ANAMMOX) process has been put forward as a promising alternative to treat ammonium rich wastewaters. An ANAMMOX gas-lift reactor and a sequential batch reactor (SBR) were operated during around 200 days in this study, reaching nitrogen loading rates (NLRs) of 2.0 and 0.75 g l-1 per day, respectively. The efficiency in the nitrite (limiting substrate) removal was 99%. The ammonium and nitrite influent concentrations were increased stepwise until biomass in the reactors started to float. These flotation events coincided with periods when the NLR exceeded the maximum specific ANAMMOX activity (MSAA) of the sludge. The MSAA, determined in batch experiments, was 0.9 and 0.44 g g-1 per day for biomasses from the gas-lift reactor and the SBR, respectively. Flotation of the biomass occurred most likely due to a granule density decrease caused by dinitrogen gas accumulation inside the granules and an apparent breakage of the granules. Further research is needed to understand this phenomenon and to optimise the corresponding strategies to counteract the flotation.
AB - In the last years, the ANAerobic AMMonium OXidation (ANAMMOX) process has been put forward as a promising alternative to treat ammonium rich wastewaters. An ANAMMOX gas-lift reactor and a sequential batch reactor (SBR) were operated during around 200 days in this study, reaching nitrogen loading rates (NLRs) of 2.0 and 0.75 g l-1 per day, respectively. The efficiency in the nitrite (limiting substrate) removal was 99%. The ammonium and nitrite influent concentrations were increased stepwise until biomass in the reactors started to float. These flotation events coincided with periods when the NLR exceeded the maximum specific ANAMMOX activity (MSAA) of the sludge. The MSAA, determined in batch experiments, was 0.9 and 0.44 g g-1 per day for biomasses from the gas-lift reactor and the SBR, respectively. Flotation of the biomass occurred most likely due to a granule density decrease caused by dinitrogen gas accumulation inside the granules and an apparent breakage of the granules. Further research is needed to understand this phenomenon and to optimise the corresponding strategies to counteract the flotation.
KW - ANAMMOX
KW - ANaerobic AMMonium OXidation
KW - COD
KW - EPS
KW - HRT
KW - MSAA
KW - chemical oxygen demand (gO l)
KW - exopolymeric substances
KW - hydraulic retention time (day)
UR - http://www.scopus.com/inward/record.url?scp=2342456353&partnerID=8YFLogxK
U2 - 10.1016/j.jbiotec.2004.02.005
DO - 10.1016/j.jbiotec.2004.02.005
M3 - Article
C2 - 15121335
AN - SCOPUS:2342456353
SN - 0168-1656
VL - 110
SP - 159
EP - 170
JO - Journal of Biotechnology
JF - Journal of Biotechnology
IS - 2
ER -