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Removal and fate of silver nanoparticles in lab-scale vertical flow constructed wetland

机译：实验室规模的垂直流人工湿地中银纳米颗粒的去除和去向

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Engineered nanomaterials (ENMs) are increasingly produced and consequently released into the environment. Therefore, there is a strong need to find a valid way to treat the ENMs pollution. In this study, the removal efficiencies of silver nanoparticles (AgNPs) from synthetic wastewater in lab-scale vertical flow constructed wetland (CW) systems with different operations (plant, hydraulic loading rates, bed depth) were investigated. Moreover, the environmental fate and impacts of AgNPs in CWs were also investigated. The results showed that CWs with plants were more effective in removing AgNPs than the unplanted CWs. Hydraulic loading had a significant effect on the performance of CWs in treating AgNPs, however, the influence of bed depth was negligible. AgNPs stopped in the CWs were mainly resided in the wetland substrate, indicating the main mechanism of AgNPs removal in CWs was through substrate adsorption. Although plant biomass, root activity, peroxidase activity of leaves and biofilm biomass were significantly altered following exposure to AgNPs (P 0.05), CWs maintained constant high efficiency (63.2-93.8%) in removing AgNPs from wastewater during a continuous 2-month running. Overall, this paper suggests the feasibility and high-efficiency of using CWs to handle AgNPs contamination. (C) 2018 Elsevier Ltd. All rights reserved.
机译：工程纳米材料（ENM）的生产越来越多，因此被释放到环境中。因此，迫切需要找到一种有效的方法来处理ENMs污染。在这项研究中，研究了在实验室规模的垂直流人工湿地（CW）系统中，以不同的操作（工厂，水力负荷率，床深）从合成废水中去除银纳米颗粒（AgNPs）的效率。此外，还研究了AgNPs在化工厂中的环境命运和影响。结果表明，与未种植的CW相比，带有植物的CW能够更有效地去除AgNP。水力负荷对连续波处理AgNPs的性能有显着影响，但是，床深的影响可以忽略不计。停止在连续水体中的AgNPs主要存在于湿地基质中，表明连续水体中AgNPs去除的主要机理是通过基质吸附。尽管暴露于AgNPs后植物生物量，根系活性，叶片的过氧化物酶活性和生物膜生物量发生了显着变化（P <0.05），但是连续2个月连续运行的CW仍保持恒定高效率（63.2-93.8％）从废水中去除AgNPs。 。总体而言，本文提出了使用连续波处理AgNPs污染的可行性和高效率。 （C）2018 Elsevier Ltd.保留所有权利。

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