Dept. of Municipal Engineering, School of Civil Engineering, Southeast University, Nanjing 210096, China.
Dept. of Municipal Engineering, School of Civil Engineering, Southeast University, Nanjing 210096, China.
Bioresour Technol. 2017 Nov;243:1216-1226. doi: 10.1016/j.biortech.2017.07.178. Epub 2017 Aug 3.
The widespread utilization of silver nanoparticles (AgNPs) in industrial and commercial products inevitably raises the release into wastewater. In this study, the influences of AgNPs (0, 50 and 200μg/L) on the performance and microbial community of CWs were evaluated. Compared with the control system (without AgNPs), the COD removal was not affected, whereas the TN, NH-N, and TP removals were evidently affected in presence of AgNPs, and the effects had a positive relation with AgNPs concentration. In addition, AgNPs were effectively removed from wastewater and mainly accumulated in the soil layer and plant tissues. The illumina high-throughput sequencing results indicated that there were obvious variations in the microbial community at different AgNPs concentrations, associated with the variations of CW performance. Sequencing analyses also showed that Proteobacteria, Acidobacteria, Bacteroidetes were the dominant phyla. These results may provide valuable information and reference for evaluating the effect of AgNPs on constructed wetlands.
纳米银（AgNPs）在工业和商业产品中的广泛应用不可避免地导致其释放到废水中。本研究评估了 AgNPs（0、50 和 200μg/L）对 CWs 性能和微生物群落的影响。与对照系统（无 AgNPs）相比，AgNPs 的存在对 COD 去除没有影响，但对 TN、NH-N 和 TP 的去除有明显影响，且影响与 AgNPs 浓度呈正相关。此外，AgNPs 可从废水中有效去除，并主要积累在土壤层和植物组织中。Illumina 高通量测序结果表明，不同 AgNPs 浓度下微生物群落存在明显变化，与 CW 性能的变化有关。测序分析还表明，变形菌门、酸杆菌门和拟杆菌门是优势门。这些结果可为评估 AgNPs 对人工湿地的影响提供有价值的信息和参考。
