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, Ocean University of China, Qingdao, 266100, China.
Key Lab of Marine Environment and Ecology, Ministry of Education, Ocean University of China, Qingdao, 266100, China.
J Environ Manage. 2017 Dec 15;204(Pt 1):667-673. doi: 10.1016/j.jenvman.2017.09.050. Epub 2017 Sep 23.
The performance, microbial community and enzymatic activity of a sequencing batch reactor (SBR) were evaluated under silver nanoparticles (Ag NPs) stress. Over 5 mg/L Ag NPs inhibited the COD and phosphorus removals, whereas the NH removal kept stable during the whole operational period. The organic matter, nitrogen and phosphorus removal rates were obviously inhibited under Ag NPs stress, which showed similar varying trends with the corresponding microbial enzymatic activities. The change of Ag content in the activated sludge indicated that some Ag NPs were absorbed by the sludge. The presence of Ag NPs promoted the increase of reactive oxygen species (ROS) and lactate dehydrogenase (LDH) of microorganism due to the microbial response to the Ag NPs toxicity, which could impact on the microbial morphology and physiological functions. The presence of Ag NPs could produce some evident changes in the microbial community.
采用序批式反应器（SBR），研究了银纳米颗粒（Ag NPs）胁迫下的反应器性能、微生物群落和酶活性。当 Ag NPs 浓度超过 5 mg/L 时，COD 和磷的去除率受到抑制，而 NH 的去除率在整个运行期间保持稳定。在 Ag NPs 胁迫下，有机物、氮和磷的去除率明显受到抑制，这与相应的微生物酶活性表现出相似的变化趋势。活性污泥中 Ag 含量的变化表明，部分 Ag NPs 被污泥所吸附。由于微生物对 Ag NPs 毒性的反应，Ag NPs 的存在促进了活性污泥中活性氧（ROS）和乳酸脱氢酶（LDH）的增加，这可能会影响微生物的形态和生理功能。Ag NPs 的存在会使微生物群落产生一些明显的变化。
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