Chronic effects of cerium dioxide nanoparticles on biological nitrogen removal and nitrous oxide emission: insight into impact mechanism and performance recovery potential

Ye, J., Gao, H., Domingo-Félez, C. , Wu, J., Zhan, M., Yu, R. and Smets, B. F. (2022) Chronic effects of cerium dioxide nanoparticles on biological nitrogen removal and nitrous oxide emission: insight into impact mechanism and performance recovery potential. Bioresource Technology, 351, 126966. (doi: 10.1016/j.biortech.2022.126966) (PMID:35278624)

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Abstract

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.

Item Type:Articles
Additional Information:This study was funded by National Natural Science Foundation of China (No. 51678134 and No. 51878145) and Key Research and Development Program of Department of Science and Technology of Jiangsu Province, China (BE2019709).
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Domingo-Felez, Dr Carlos
Authors: Ye, J., Gao, H., Domingo-Félez, C., Wu, J., Zhan, M., Yu, R., and Smets, B. F.
College/School:College of Science and Engineering > School of Engineering > Infrastructure and Environment
Journal Name:Bioresource Technology
Publisher:Elsevier
ISSN:0960-8524
ISSN (Online):1873-2976
Published Online:09 March 2022

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