Temporal deposition of copper and zinc in the sediments of metal removal constructed wetlands

Abstract

The objective of this study was to explore the effects of time, seasons, and total carbon (TC) on Copper (Cu) and Zinc (Zn) deposition in the surface sediments. This study was performed at the H-02 constructed wetland on the Savannah River Site (Aiken, SC, USA). Covering both warm (April-September) and cool (October-March) seasons, several sediment cores were collected twice a year from the H-02 constructed wetland cells from 2007 to 2013. Total concentrations of Cu and Zn were measured in the sediments. Concentrations of Cu and Zn (mean ± standard deviation) in the surface sediments over 7 years of operation increased from 6.0 ± 2.8 and 14.6 ± 4.5 mg kg-1 to 139.6 ± 87.7 and 279.3 ± 202.9 mg kg-1 dry weight, respectively. The linear regression model explained the behavior and the variability of Cu deposition in the sediments. On the other hand, using the generalized least squares extension with the linear regression model allowed for unequal variance and thus produced a model that explained the variance properly, and as a result, was more successful in explaining the pattern of Zn deposition. Total carbon significantly affected both Cu (p = 0.047) and Zn (p < 0.001). Time effect on Cu deposition was statistically significant (p = 0.013), whereas Zn was significantly affected by the season (p = 0.009).

Environmental assessment of Heavy Metals in Sedi - ments of Tigris, Euphrates, Shatt Al-Arab rivers and northern west of Arabian Gulf.

“…The elevated levels of iron (Fe) concentration stemmed from the abundant natural presence of iron in the Earth's crust. Furthermore, the sustainable practices of fishing vessels and human activities played a role, particularly in the buildup of iron residues and the introduction of iron oxides into the river, which carries them along [24].…”

Spatiotemporal Changes in Trace Metal Bioavailability in the Sediment Pore water of a Constructed Wetland Using Passive Pore water Samplers

“…Seasonal variations were evaluated by performing the study during cool months (October 2021–February 2022) and warm months (May 2022–September 2022). Deployment was performed at both the IF and EF sites in both wetland cells (Supporting Information, Figure S1; Baddar et al, 2021; Xu & Mills, 2018). The sampling locations were selected far from the edges to avoid disturbance and far from the middle to avoid dense population of giant bulrush ( Schoenoplectus californicus ).…”

Bioremediation of copper in sediments from a constructed wetland ex situ with the novel bacterium Cupriavidus basilensis SRS

“…Metal resistance was tested to determine the viability of the culture to tolerate contaminated sites. Cu and Cobalt (Co) were selected based on previous studies with Cupriavidus 32 . To determine the ability of the novel bacterium to survive in the presence of elevated Cu and Co concentrations eight replicates of each culture treatment condition, including the elevated metal concentrations, were grown in 100 well honeycomb plates compatible with the Bioscreen C turbidity indicator (OY Growth Curves AB Ltd.).…”