Key Laboratory of Integrated Regulation and Resources Development on Shallow Lakes, Ministry of Education, 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, Hohai University, Nanjing 210098, People's Republic of China; College of Environment, Hohai University, Nanjing 210098, People's Republic of China.
Bioresour Technol. 2015 Jan;176:65-70. doi: 10.1016/j.biortech.2014.11.020. Epub 2014 Nov 13.
The effects of CuO nanoparticles (NPs) on the production and composition of extracellular polymeric substances (EPS) and the physicochemical stability of activated sludge were investigated. The results showed enhanced production of loosely bound extracellular polymeric substances (LB-EPS), protecting against nanotoxicity. Specifically, polysaccharide production increased by 89.7% compared to control upon exposure to CuO NPs (50mg/L). Fourier transform-infrared spectroscopy analysis revealed changes in the polysaccharide COC group and the carboxyl group of proteins in the EPS in the presence of CuO NPs. The sludge flocs were unstable after exposure to CuO NPs (50mg/L) because of excess LB-EPS. This also corresponded with decreased cell viability of the sludge flocs, as determined by the production of reactive oxygen species and the release of lactate dehydrogenase. These results are key to assessing the adverse effects of the CuO NPs on activated sludge in wastewater treatment plants.
研究了氧化铜纳米粒子（NPs）对胞外聚合物（EPS）的产生和组成以及活性污泥物理化学稳定性的影响。结果表明，纳米毒性得到了增强，形成了松散结合的胞外聚合物（LB-EPS）。具体而言，与对照相比，暴露于 50mg/L 的 CuO NPs 时，多糖的产生增加了 89.7%。傅里叶变换红外光谱分析显示，在 CuO NPs 存在下，EPS 中的多糖 COC 基团和蛋白质的羧基基团发生了变化。由于 LB-EPS 过多，暴露于 50mg/L 的 CuO NPs 后污泥絮体变得不稳定。这也与污泥絮体的细胞活力下降相对应，这是通过活性氧的产生和乳酸脱氢酶的释放来确定的。这些结果对于评估氧化铜纳米粒子对污水处理厂中活性污泥的不良影响至关重要。
