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Environ Technol. 2019 Jun 14:1-11. doi: 10.1080/09593330.2019.1629182. [Epub ahead of print]

Effects of aluminum oxide nanoparticles on the performance, extracellular polymeric substances, microbial community and enzymatic activity of sequencing batch reactor.

Li S1,2,3, Zhao C1, Ma B1, Wang J1, She Z1, Guo L1, Zhao Y1,2, Jin C1,3, Dong J1, Gao M1,3.

Author information

1
a Key Lab of Marine Environment and Ecology, Ministry of Education, Ocean University of China , Qingdao , People's Republic of China.
2
b Shandong Provincial Key Laboratory of Marine Environment and Geological Engineering, Ocean University of China , Qingdao , People's Republic of China.
3
c College of Environmental Science and Engineering, Ocean University of China , Qingdao , People's Republic of China.

Abstract

The performance, pollutant removal rate, microbial community and enzymatic activity of a sequencing batch reactor (SBR) were investigated under oxide nanoparticles (Al2O3 NPs) stress. Al2O3 NPs at 0-50 mg/L showed no evident impact on the COD and NH4+ removals of SBR. The oxygen-uptake rate, nitrifying rate and nitrite-reducing rate slightly diminished with the increase of Al2O3 NPs concentration. Compared with 0 mg/L Al2O3 NPs, the dehydrogenase activity declined by 23.52% at 50 mg/L Al2O3 NPs. The activities of ammonia monooxygenase, nitrite oxidoreductase and nitrite reductase decreased with the increase of Al2O3 NPs concentration from 0 to 50 mg/L Al2O3 NPs. However, the nitrate reductase (NR) activity slightly increased at 5 and 15 mg/L Al2O3 NPs and declined at 30 and 50 mg/L Al2O3 NPs. The microbial reactive oxygen species (ROS) production and lactate dehydrogenase (LDH) release merely raised 14.80% and 20.72% at 50 mg/L Al2O3 NPs by contrast with 0 mg/L Al2O3 NPs, respectively. Al2O3 NPs enhanced the production, protein content and polysaccharide content of extracellular polymeric substances owing to preventing the microbes from Al2O3 NPs biotoxicity. The existence of Al2O3 NPs led to the variations of microbial richness and diversity in the SBR due to their biotoxicity.

KEYWORDS:

Aluminum oxide nanoparticles; denitrifying rate; enzymatic activity; microbial richness; nitrifying rate

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