Long-term effects of environmentally relevant concentration of Ag nanoparticles on the pollutant removal and spatial distribution of silver in constructed wetlands with Cyperus alternifolius and Arundo donax

被引:28
作者
Cao, Chong [1 ]
Huang, Juan [1 ]
Guo, Yang [2 ]
Yan, Chun Ni [1 ]
Xiao, Jun [1 ]
Ma, Yi Xuan [1 ]
Liu, Jia Liang [1 ]
Guan, Wen Zhu [1 ]
机构
[1] Southeast Univ, Dept Municipal Engn, Sch Civil Engn, Nanjing 210096, Jiangsu, Peoples R China
[2] Secur Support Ctr Urban Water Supply Jiangsu Prov, Nanjing 210036, Jiangsu, Peoples R China
基金
中国国家自然科学基金;
关键词
Silver nanoparticles; Constructed wetlands; Pollutant removal; Wetland plants; Migration; MICROBIAL COMMUNITY STRUCTURE; WASTE-WATER; SYSTEM PERFORMANCE; METAL ACCUMULATION; MASS-BALANCE; FATE; SOIL; DENITRIFICATION; NANOSILVER; RETENTION;
D O I
10.1016/j.envpol.2019.05.144
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
The widely usage of silver nanoparticles in a range of consumer products inevitably results in its being released to the wastewater. As a result, the potential negative effects associated with AgNPs on wastewater treatment systems need to be assessed to develop the regulatory guidelines. In this paper, the exposure experiment at environmentally relevant concentration (100 mu g L-1) were conducted to demonstrate the effects of AgNPs on the pollutant removals in constructed wetlands (CWs) with different plants and the spatial distribution of silver. Before adding AgNPs, the system with Arundo donax (VF2) had the better nitrogen removal than Cyperus alternifolius (VF1). After exposure for about 94 d, the average removal efficiencies of NH4+-N significantly reduced by 32.43% and 23.92%, TN of 15.82% and 17.18% and TP of 22.74% and 20.46% in VF1 and VF2, respectively, while the COD removal had no difference. However, presence of 100 mu g L-1 AgNPs for about 450 d showed no inhibition effects on nutrient removals in two experimental CWs. Two wetlands showed high removal efficiencies of about 98% on AgNPs, indicating CWs could play a crucial role to control the AgNPs release to environment. It was found that AgNPs mainly accumulated in the soil layer with the Ag content of 0.45-5.96 mu g g(-1) dry weight in lower soil and 2.84-11.37 mu g g(-1) dry weight in upper soil. The roots of Cyperus alternifolius absorbed more AgNPs, with higher bioconcentration factors (1.32-1.44) than that of 0.59 in Arundo donax. The differences of translocation factors on leaves and stems in two test plants showed that AgNPs assimilated by roots in Cyperus alternifolius were more easily transferred to the leaves. The obtained results showed that the macrophyte Cyperus alternifolius could be better choice for immobilization of AgNPs. (C) 2019 Elsevier Ltd. All rights reserved.
引用
收藏
页码:931 / 940
页数:10
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