TY - JOUR
T1 - Chronic effects of cerium dioxide nanoparticles on biological nitrogen removal and nitrous oxide emission
T2 - Insight into impact mechanism and performance recovery potential
AU - Ye, Jinyu
AU - Gao, Huan
AU - Domingo-Félez, Carlos
AU - Wu, Junkang
AU - Zhan, Manjun
AU - Yu, Ran
AU - Smets, Barth F.
PY - 2022
Y1 - 2022
N2 - The influence of cerium dioxide nanoparticles (CeO2 NPs) on biological nitrogen removal and associated nitrous oxide (N2O) emission has seldom been addressed yet. Herein, the chronic effect of CeO2 NPs on the nitrogen transformation processes during wastewater treatment and the impacted system's self-recovery potential after CeO2 NP stress removal were investigated. CeO2 NP of 10-50 mg/L induced significant declines of the ammonia nitrogen (NH4+-N) and the total nitrogen removal efficiencies, but triggered the nitrite accumulation and the N2O emission. The N2O reductase (NOS) activity was negatively correlated with the N2O emission level, and the inhibition of NOS activity under CeO2 NP stress was probably due to the depressions of the sludge denitrifiers' metabolic activities. The NH4+-N removal efficiency was successfully regained after the recovery period although the N2O emission level was still higher than the pre-exposure period, which was probably due to the residual CeO2 NPs inside the activated sludge.
AB - The influence of cerium dioxide nanoparticles (CeO2 NPs) on biological nitrogen removal and associated nitrous oxide (N2O) emission has seldom been addressed yet. Herein, the chronic effect of CeO2 NPs on the nitrogen transformation processes during wastewater treatment and the impacted system's self-recovery potential after CeO2 NP stress removal were investigated. CeO2 NP of 10-50 mg/L induced significant declines of the ammonia nitrogen (NH4+-N) and the total nitrogen removal efficiencies, but triggered the nitrite accumulation and the N2O emission. The N2O reductase (NOS) activity was negatively correlated with the N2O emission level, and the inhibition of NOS activity under CeO2 NP stress was probably due to the depressions of the sludge denitrifiers' metabolic activities. The NH4+-N removal efficiency was successfully regained after the recovery period although the N2O emission level was still higher than the pre-exposure period, which was probably due to the residual CeO2 NPs inside the activated sludge.
KW - CeO2 nanoparticle
KW - Nitrification/denitrification
KW - Nitrous oxide
KW - Metabolic activity
KW - Recovery potential
U2 - 10.1016/j.biortech.2022.126966
DO - 10.1016/j.biortech.2022.126966
M3 - Journal article
C2 - 35278624
SN - 0960-8524
VL - 351
JO - Bioresource Technology
JF - Bioresource Technology
M1 - 126966
ER -