期刊
ENVIRONMENTAL POLLUTION
卷 252, 期 -, 页码 794-803出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2019.06.017
关键词
Wind speed; Aquatic vegetation; Mass distribution; Elimination efficiency; Environmental processes; Structural equation model (SEM)
资金
- National Natural Science Foundation of China [51809226, 21607123, 51709002]
- China Postdoctoral Science Foundation [2018M632390]
- Natural Science Foundation of the Jiangsu Higher Education Institutions of China [18KJB610022]
- Jiangsu Provincial laboratory for Water Environmental Protection Engineering [W1804]
- Jiangsu Planned Projects for Postdoctoral Research Funds [2018K124C]
- Jiangsu Funded the Recruitment of Postdoctoral Project [2018Z051]
The environmental concerns regarding the possible threats of tetrabromobisphenol A (TBBPA) to aquatic environments are increasing. However, information about TBBPA cycling in the water-vegetation-sediment systems of shallow lakes is limited. In a shallow lake, wind-induced disturbance is considered as the key factor of affecting the cycling of contaminants. To address this issue, the TBBPA distribution and elimination processes were simulated for three typical wind speeds by using an annular flume. Four forms of TBBPA were studied in these systems, including water, suspended solids (SS), vegetation and sediment. The results showed that the mass distributions of TBBPA in water, SS and vegetation increased remarkably while enhancing the wind-induced disturbances, which resulted from the release of TBBPA from the sediment through resuspension and adsorption-desorption processes. However, most of the TBBPA (up to 94%) still accumulated in the sediment. Wind-induced disturbances and vegetation both increased the TBBPA elimination rate in the water-vegetation-sediment systems. The half-life (T-1/2) of TBBPA in the fast wind condition was 16.1 +/- 0.2 days, which was shorter than that in the static condition (29.8 +/- 0.9 days). Compared to the systems without vegetation, the presence of vegetation shortened the T-1/2 by 7.3 days in the static condition. Furthermore, a structural equation model (SEM) was used to assess the direct and indirect effects of environmental factors on the TBBPA amounts in each form. The main effects of wind speed and vegetation in the TBBPA cycling of each form (except for the TBBPA on vegetation) were indirect by affecting the dissolved oxygen (DO), velocity and suspended solids concentration (SSC). Overall, the findings provide useful information about the fate of TBBPA and other related organic contaminants in shallow lake systems. (C) 2019 Elsevier Ltd. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据