Long-term effects of ZnO nanoparticles on nitrogen and phosphorus removal, microbial activity and microbial community of a sequencing batch reactor

• Published in: Bioresource technology 2016-09, Vol.216, p.428-436
• Main Authors: Wang, Sen, Gao, Mengchun, She, Zonglian, Zheng, Dong, Jin, Chunji, Guo, Liang, Zhao, Yangguo, Li, Zhiwei, Wang, Xuejiao
• Format: Article
• Language: English
• Subjects: Bioreactors - microbiology; Metal Nanoparticles - chemistry; Microbial community; Microbial enzymatic activity; Nitrogen - analysis; Nitrogen and phosphorus removal; Phosphorus - analysis; Sequencing batch reactor; Sewage - chemistry; Waste Disposal, Fluid - methods; Water Pollutants, Chemical - analysis; Zinc Oxide - chemistry; ZnO nanoparticles
• ISSN: 0960-8524; 1873-2976
• DOI: 10.1016/j.biortech.2016.05.099

•High ZnO NPs concentration could affect nitrogen and phosphorus removal.•Microbial enzymatic activities were analyzed at different ZnO NPs concentration.•Nitrogen and phosphorus removal rate was related to microbial enzymatic activity.•Microbial community was investigated at phylum, class and genus level. The performance, microbial activity, and microbial community of a sequencing batch reactor (SBR) were investigated under the long-term exposure of ZnO nanoparticles (ZnO NPs). Low ZnO NPs concentration (less than 5mg/L) had no obvious effect on the SBR performance, whereas the removals of COD, NH4+-N, and phosphorus were affected at 10–60mg/L ZnO NPs. The variation trend of nitrogen and phosphorus removal rate was similar to that of microbial enzymatic activity with the increase of ZnO NPs concentrations. The richness and diversity of microbial community showed obvious variations at different ZnO NPs concentrations. ZnO NPs appeared on the surface and cell interior of activated sludge, and the Zn contents in the effluent and activated sludge increased with the increase of ZnO NPS concentration. The present results provide use information to understand the effect of ZnO NPS on the performance of wastewater biological treatment systems.