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首页> 外文期刊>RSC Advances >Evaluation of performance and microbial community successional patterns in an integrated OCO reactor under ZnO nanoparticle stress
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Evaluation of performance and microbial community successional patterns in an integrated OCO reactor under ZnO nanoparticle stress

机译：ZnO纳米颗粒应力作用下集成OCO反应器性能和微生物群落演替模式的评估

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An integrated OCO reactor was used to investigate the performance and microbial community successional changes under long-term exposure to relatively low levels of ZnO nanoparticles (NPs). Relatively higher concentrations of ZnO NPs (1.5?mg L ~(?1) ) could adversely affect the nitrogen and phosphorus removal in the reactor. The diversity and richness of the microbial communities chronically declined with an increasing concentration of ZnO NPs higher than 1.5 mg L ~(?1) . With the elevated ZnO NPs, the phyla abundances of Proteobacteria , Firmicutes and Actinobacteria decreased slightly, whereas those of Bacteroidetes and Acidobacteria increased. Bacteroidetes and Proteobacteria were the predominant phyla in each phase (with a variation in abundance), together with some common taxa responses to ZnO NP stress as revealed by Venn diagram analysis. Some genera associated with the removal of nitrogen and phosphorus, such as Acinetobacter , Stenotrophomonas and Pseudomonas , decreased significantly. The present results are significant for expanding our understanding of the functional performance and microbial community successions of activated sludge which has experienced long-term exposure to environmentally relevant concentrations of ZnO NPs.
机译：集成的OCO反应器用于研究长期暴露于相对较低水平的ZnO纳米颗粒（NPs）下的性能和微生物群落的连续变化。较高浓度的ZnO NPs（1.5？mg L〜（？1））可能会对反应器中氮和磷的去除产生不利影响。 ZnO NPs的浓度高于1.5 mg L〜（？1）时，微生物群落的多样性和丰富度逐渐下降。随着ZnO NPs的升高，变形杆菌，硬毛菌和放线菌的菌群丰度略有下降，而拟杆菌属和酸性菌的菌群丰度却有所增加。文恩图分析显示，细菌分枝杆菌和变形杆菌是每个阶段的主要门（丰度有所变化），以及对ZnO NP胁迫的一些常见分类单元。与除氮和除磷相关的一些属，如不动杆菌，嗜麦芽单胞菌和假单胞菌，明显减少。目前的结果对于扩大我们对活性污泥的功能性能和微生物群落演替的理解意义重大，活性污泥已长期暴露于与环境有关的ZnO NPs浓度。

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