Shifts of system performance and microbial community structure in a constructed wetland after exposing silver nanoparticles

Chemosphere
Chong CaoWenzhu Guan

Abstract

The increasing utilization of silver nanoparticles (Ag NPs) in industry and commerce inevitably raises its release into wastewater. In this work, effects of Ag NPs on system performance and microbial community along the way of a vertical flow constructed wetland (VFCW) were investigated, along with the removal and fate of Ag NPs within the system. Results showed that the performance of control wetland kept stable during the experimental period, and the top substrate layer (soil layer) of wetland could remove most of pollutants in the influent. The study also suggested that addition of Ag NPs did not significantly affect organic matters removal. However, adverse effects were observed on the nitrogen and phosphorus removal. Removal efficiencies of TN, NH4+-N and TP approximately obviously reduced by approximately 10.10%, 8.42% and 28.35% respectively in contrast to before dosing after exposing 100 μg/L Ag NPs for 94 d, while the no dosing wetland with the stable performance. It was found that Ag NPs accumulated in the upper soil layer more than in the lower soil layer, and Ag NPs could enter into the plant tissues. After continuous input of Ag NPs, removal efficiency of Ag NPs was measured as 95.72%, which showed that the CW coul...Continue Reading

Citations

Feb 13, 2021·Ecotoxicology and Environmental Safety·Fuad AmeenSaleh ALNadhari
Mar 27, 2019·Water Research·Pabel Cervantes-AvilésArturo A Keller
May 26, 2021·The Science of the Total Environment·Shushan WuKimberly A Gray
Jul 15, 2021·Environmental Science and Pollution Research International·Chong CaoXin-Xin Zhang
Feb 19, 2019·Environmental Science & Technology·Christopher S WardDana E Hunt

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