Key Laboratory of Integrated Regulation and Resources Development on Shallow Lakes, Ministry of Education, College of Environment, Hohai University, Nanjing 210098, People's Republic of China; College of Environment, Hohai University, Nanjing 210098, People's Republic of China.
Key Laboratory of Integrated Regulation and Resources Development on Shallow Lakes, Ministry of Education, College of Environment, Hohai University, Nanjing 210098, People's Republic of China; College of Environment, Hohai University, Nanjing 210098, People's Republic of China.
Bioresour Technol. 2017 Mar;227:393-397. doi: 10.1016/j.biortech.2016.12.041. Epub 2016 Dec 18.
The short term (8h) influences of cerium oxide nanoparticles (CeONPs) on the process of phosphorus removal in biofilm were investigated. At concentration of 0.1mg/L, CeO NPs posed no impacts on total phosphorus (TP) removal. While at 20mg/L, TP removal efficiency reduced from 85.16% to 59.62%. Results of P distribution analysis and P nuclear magnetic resonance spectroscopy implied that the anaerobic degradation of polyphosphate (polyP) and the release of orthophosphate in extracellular polymeric substances (EPS) were inhibited. After aerobic exposure, the average chain length of polyP in microbial cells and EPS was shorter than control, and monoester and diester phosphates in cells were observed to release into EPS. Moreover, the EPS production and its contribution to P removal increased, while the capacity of EPS in P storage declined. X-ray diffraction analysis and saturation index calculation revealed that the formation of inorganic P precipitation in biofilm was inhibited.
研究了氧化铈纳米颗粒（CeONPs）在 8 小时内对生物膜中磷去除过程的短期影响。在浓度为 0.1mg/L 时，CeO NPs 对总磷（TP）去除没有影响。而在 20mg/L 时，TP 去除效率从 85.16%降低至 59.62%。磷分布分析和磷核磁共振波谱结果表明，聚磷酸盐（polyP）的厌氧降解和细胞外聚合物物质（EPS）中正磷酸盐的释放受到抑制。好氧暴露后，微生物细胞和 EPS 中 polyP 的平均链长短于对照，并且观察到细胞中的单酯和二酯磷酸盐释放到 EPS 中。此外，EPS 的产生及其对 P 去除的贡献增加，而 EPS 储存 P 的能力下降。X 射线衍射分析和饱和度指数计算表明，生物膜中无机 P 沉淀的形成受到抑制。
