Key Lab of Marine Environment and Ecology, Ministry of Education, Ocean University of China, Qingdao, 266100, China; Shandong Provincial Key Laboratory of Marine Environment and Geological Engineering, Qingdao, 266100, China.
Key Lab of Marine Environment and Ecology, Ministry of Education, Ocean University of China, Qingdao, 266100, China.
J Environ Manage. 2018 Sep 15;222:475-482. doi: 10.1016/j.jenvman.2018.05.089. Epub 2018 Jun 13.
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 NH-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.
研究了氧化镁纳米颗粒（MgO NPs）胁迫下序批式反应器（SBR）的性能、微生物酶活性和微生物群落。在整个运行过程中，NH-N 去除效率保持相对稳定。30-60mg/L 的 MgO NPs 略微抑制了化学需氧量（COD）的去除，MgO NPs 的存在也影响了反硝化和除磷。比耗氧速率、硝化和反硝化速率、除磷率和微生物酶活性随 MgO NPs 浓度的增加而明显变化。MgO NPs 的出现促进了更多的活性氧物质的产生和从活性污泥中乳酸脱氢酶的渗漏，表明 MgO NPs 对 SBR 中的活性污泥具有明显的毒性。随着 MgO NPs 浓度的增加，活性污泥中胞外聚合物的蛋白质和多糖含量增加。由于 MgO NPs 的生物毒性，不同 MgO NPs 浓度下的微生物丰富度和多样性在门、纲和属水平上明显不同。
