Sink or source? Insights into the behavior of copper and zinc in the sediment porewater of a constructed wetland by peepers

Qin, Chongyang; Xu, Xiaoyu; Peck, Erin

doi:10.1016/j.scitotenv.2022.153127

Title: Sink or source? Insights into the behavior of copper and zinc in the sediment porewater of a constructed wetland by peepers

Journal Article · 16 January 2022 · Science of the Total Environment

DOI: https://doi.org/10.1016/j.scitotenv.2022.153127 · OSTI ID:1894467

Qin, Chongyang ^[1]; Xu, Xiaoyu ^[2]; Peck, Erin ^[2]

Univ. of Georgia, AIken, SC (United States); Savannah River Ecology Laboratory, University of Georgia
Univ. of Georgia, AIken, SC (United States)

The H-02 free water surface constructed wetland has been applied to remove heavy metals, mainly copper (Cu) and zinc (Zn), from wastewater on the Savannah River Site (Aiken, SC, USA). More and more studies focus on the metal behavior between the sediment and the overlying water, which directly reflects the stability of metals after sedimentation in constructed wetlands. This study focused on the biogeochemical pathways in metal bioavailability and remobilization in the sediment after metals were removed from the overlying water. The dialysis sampling devices (peepers) were used to collect porewater samples from eight depths in the sediment for the measurement of Cu, Zn, dissolved organic carbon (DOC), and major anions (sulfate and chloride). Surface water samples were also collected for the measurement of Cu, Zn, DOC, and anions. Different temporal trends were observed for dissolved Cu between the surface and bottom waters, but not for dissolved Zn. There were no obvious changes in porewater metal concentrations with increasing depths in the sediment. Sediment served as a sink for Cu as only 3% of porewater samples showed higher labile Cu concentrations than the surface water during the entire year. Furthermore, sediment served as a source for Zn in summer and winter as 32% of porewater samples showed higher labile Zn concentrations than the surface water, and these samples were collected at all sediment depths. We think the seasonal changes in the behaviors of Cu and Zn were primarily controlled by the sulfur dynamics and the metal removal processes in the constructed wetland, as well as the different complexing chemistry between Cu and Zn. Also, our study supports that peeper is a powerful tool for studying the biogeochemistry of metals in the sediment.

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Research Organization:: Univ. of Georgia, AIken, SC (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: EM0005228

OSTI ID:: 1894467

Journal Information:: Science of the Total Environment, Journal Name: Science of the Total Environment Vol. 821; ISSN 0048-9697

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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