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.
Bioresour Technol. 2017 Dec;245(Pt A):673-680. doi: 10.1016/j.biortech.2017.09.018. Epub 2017 Sep 6.
The performance, microbial community and enzymatic activity of a sequencing batch reactor (SBR) were evaluated at different silica nanoparticles (SiO NPs) concentrations. SiO NPs concentration at 5-30mg/L had a slight inhibitory impact on the nitrogen and COD removals, whereas the phosphorus removal was obviously inhibited at 30mg/L SiO NPs. The rates of nitrification, nitrite reduction and phosphorus removal decreased with the increase of SiO NPs concentration. The nitrate reduction rate decreased at less than 5mg/L SiO NPs and subsequently showed an increase at 10-30mg/L SiO NPs. The organic matter, nitrogen and phosphorus removal rates had similar varying tendencies to the corresponding microbial enzymatic activities under SiO NPs stress. Some SiO NPs were firstly absorbed on sludge surface and subsequently entered the interior of the microbial cells, which could exert the biological toxicity to activated sludge. The microbial community showed some obvious variations under SiO NPs stress.
在不同二氧化硅纳米颗粒（SiO NPs）浓度下，评估了序批式反应器（SBR）的性能、微生物群落和酶活性。5-30mg/L 的 SiO NPs 浓度对氮和 COD 的去除有轻微的抑制作用，而 30mg/L 的 SiO NPs 对磷的去除有明显的抑制作用。随着 SiO NPs 浓度的增加，硝化、亚硝酸盐还原和磷去除的速率降低。硝酸盐还原速率在小于 5mg/L 的 SiO NPs 下降低，随后在 10-30mg/L 的 SiO NPs 下增加。在 SiO NPs 胁迫下，有机物、氮和磷的去除率与相应的微生物酶活性有相似的变化趋势。一些 SiO NPs 首先被吸附在污泥表面，然后进入微生物细胞内部，这可能对活性污泥产生生物毒性。微生物群落在 SiO NPs 胁迫下表现出一些明显的变化。
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