Journal
SCIENCE OF THE TOTAL ENVIRONMENT
Volume 712, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.scitotenv.2019.135759
Keywords
CuO nanoparticles (NPs); Sulfamethoxazole (SMX) antibiotic; Partial nitrification (PN); Nitrogen removal; Antibiotic resistance genes (ARGs); Metal resistance genes (MRGs)
Categories
Funding
- National Natural Science Foundation of China (NSFC) [41701569]
- Science and Technology Opening Cooperation Project of Henan Province [182106000010]
- project of young-backbone teacher in Colleges and Universities of Henan Province [2019GGJS129]
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Considering the inevitable release of antibiotics and nanoparticles (NPs) into the nitrogen containing wastewater, the combined impact of CuO NPs and sulfamethoxazole (SMX) antibiotic on partial nitrification (PN) process was investigated in four identical reactors. Results showed that the bioactivity of the aerobic ammonia-oxidizing bacteria (AOB) decreased by half after they were exposed to the combination of CuO NPs and SMX for short-term; however, there was no obvious variation in the bioactivity of AOB when they were exposed to either CuO NPs or SMX. During long-term exposure, the ammonia removal efficiency (ARE) of CuO NPs improved whereas that of SMX decreased, while the combination of CuO NPs and SMX significantly decreased ARE from 62.9% (in control) W 38.2% and had an unsatisfactory self-recovery performance. The combination of CuO NPs and SMX significantly changed the composition of microbial community, decreased the abundance of AOB, and significantly suppressed PN process. Reegarding the resistance genes, the CuO NPs-SMX combination did not improve the expression of copA, cusA, sul1 and sul2; however, it significantly induced the expression of.stil3 and sulA. (C) 2019 Elsevier B.V. All rights reserved.
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