Effect of magnesium oxide nanoparticles on microbial diversity and removal performance of sequencing batch reactor. (15th September 2018)

• Record Type: Journal Article
• Authors: Ma, Bingrui; Yu, Naling; Han, Yuetong; Gao, Mengchun; Wang, Sen; Li, Shanshan; Guo, Liang; She, Zonglian; Zhao, Yangguo; Jin, Chunji; Gao, Feng
• Is Part Of: Journal of environmental management. Volume 222(2018)
• Page Start: 475
• Page End: 482
• Publication Date: 2018-09-15
• Subjects: MgO NPs -- Nitrifying rate -- Denitrifying rate -- Lactate dehydrogenase -- Microbial community -- Extracellular polymeric substances; Environmental policy -- Periodicals; Environmental management -- Periodicals; Environment -- Periodicals; Ecology -- Periodicals; 363.705
• DOI: 10.1016/j.jenvman.2018.05.089
• Languages: English
• ISSNs: 0301-4797

Abstract

Abstract: The performance, microbial enzymatic activity and microbial community of a sequencing batch reactor (SBR) have been explored under magnesium oxide nanoparticles (MgO NPs) stress. The NH4 + -N removal efficiency kept relatively stable during the whole operational process. The MgO NPs at 30–60 mg/L slightly restrained the removal of chemical oxygen demand (COD), and the presence of MgO NPs also affected the denitrification and phosphorus removal. The specific oxygen uptake rate, nitrifying and denitrifying rates, phosphorus removal rate, and microbial enzymatic activities distinctly varied with the increase of MgO NPs concentration. The appearance of MgO NPs promoted more reactive oxygen species generation and lactate dehydrogenase leakage from activated sludge, suggesting that MgO NPs had obvious toxicity to activated sludge in the SBR. The protein and polysaccharide contents of extracellular polymeric substances from activated sludge increased with the increase of MgO NPs concentration. The microbial richness and diversity at different MgO NPs concentrations obviously varied at the phylum, class and genus levels due to the biological toxicity of MgO NPs. Highlights: MgO NPs inhibited the SAOR, SNOR, SNIRR and SOUR of activated sludge. SPUR and SPRR kept the decreasing trend with the increase of MgO NPs concentration. MgO NPs inhibited the DHA, AMO, NOR, NR, PPX and PPK of activated sludge. MgO NPs promoted the activated sludge to produce more ROS, LDH and EPS. Microbial richness and diversity showed obvious changes under MgO NPs stress.