Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5117381 | Journal of Environmental Management | 2017 | 10 Pages |
Abstract
The long-term effects of cupric oxide nanoparticles (CuO NPs) on the performance, microbial activity and microbial community of activated sludge were investigated in a sequencing batch reactor (SBR). The SBR performance had no evident change at 0-10Â mg/L CuO NPs, whereas the CuO NPs concentration at 30-60Â mg/L affected the COD, NH4+-N and soluble orthophosphate (SOP) removal, nitrogen and phosphorus removal rate and microbial enzymatic activity of activated sludge. Some CuO NPs might be absorbed on the surface of activated sludge or penetrate the microbial cytomembrane into the microbial cell interior of activated sludge. Compared to 0Â mg/L CuO NPs, the reactive oxygen species (ROS) production and lactate dehydrogenase (LDH) release increased by 43.6% and 56.4% at 60Â mg/L CuO NPs, respectively. The variations of ROS production and LDH release demonstrated that CuO NPs could induce the toxicity towards the microorganisms and destroy the integrity of microbial cytomembrane in the activated sludge. High throughput sequencing of 16S rDNA indicated that CuO NPs could evidently impact on the microbial richness, diversity and composition of activated sludge in the SBR.
Keywords
Related Topics
Physical Sciences and Engineering
Energy
Renewable Energy, Sustainability and the Environment
Authors
Sen Wang, Zhiwei Li, Mengchun Gao, Zonglian She, Bingrui Ma, Liang Guo, Dong Zheng, Yangguo Zhao, Chunji Jin, Xuejiao Wang, Feng Gao,