Metal distribution and stability in constructed wetland sediment

Anna Sophia Knox, Michael H Paller, Eric A. Nelson, Winona L. Specht, Nancy V. Halverson, John B. Gladden

Research output: Contribution to journalArticle

41 Citations (Scopus)

Abstract

The A-01 wetland treatment system (WTS) is a surface flow wetland planted with giant bulrush [Schoenoplectus californicus (C.A. Mey.) Palla] that is designed to remove Cu and other metals from the A-Ol National Pollution Discharge Elimination System (NPDES) effluent at the Savannah River Site near Aiken, SC. Copper, Zn, and Pb concentrations in water were usually reduced 60 to 80% by passage through the treatment system. The Cu concentrations in the wetland sediments increased from about 4 to 205 and 796 mg kg -1, respectively, in the organic and floe sediment layers in cell 4A over a 5-yr period. Metal concentrations were higher in the two top layers of sediment (i.e., the floe and organic layers) than in the deeper inorganic layers. Sequential extraction was used to evaluate remobilization and retention of Cu, Pb, Zn, Mn, and Fe in the wetland sediment. Metal remobilization was determined by the potentially mobile fraction (PMF) and metal retention by the recalcitrant factor (RF). The PMF values were high in the floe layer but comparatively low in the organic and inorganic layers. High RF values for Cu, Zn, and Pb in the organic and inorganic layers indicated that these metals were strongly bound in the sediment. The RF values for Mn were lower than for the other elements especially in the floe layer, indicating low retention or binding capacity. Retention of contaminants was also evaluated by distribution coefficient (K d) values. Distribution coefficient (K d) values were lower for Cu and Zn than for Pb, indicating a smaller exchangeable fraction for Pb.

Original languageEnglish (US)
Pages (from-to)1948-1959
Number of pages12
JournalJournal of Environmental Quality
Volume35
Issue number5
DOIs
StatePublished - Sep 2006
Externally publishedYes

Fingerprint

Wetlands
constructed wetland
Sediments
Metals
metal
sediment
wetland
remobilization
Copper
Effluents
Pollution
Rivers
distribution
Impurities
Water
effluent
copper
pollution
pollutant
river

ASJC Scopus subject areas

  • Environmental Science(all)
  • Environmental Chemistry

Cite this

Knox, A. S., Paller, M. H., Nelson, E. A., Specht, W. L., Halverson, N. V., & Gladden, J. B. (2006). Metal distribution and stability in constructed wetland sediment. Journal of Environmental Quality, 35(5), 1948-1959. https://doi.org/10.2134/jeq2006.0017

Metal distribution and stability in constructed wetland sediment. / Knox, Anna Sophia; Paller, Michael H; Nelson, Eric A.; Specht, Winona L.; Halverson, Nancy V.; Gladden, John B.

In: Journal of Environmental Quality, Vol. 35, No. 5, 09.2006, p. 1948-1959.

Research output: Contribution to journalArticle

Knox, AS, Paller, MH, Nelson, EA, Specht, WL, Halverson, NV & Gladden, JB 2006, 'Metal distribution and stability in constructed wetland sediment', Journal of Environmental Quality, vol. 35, no. 5, pp. 1948-1959. https://doi.org/10.2134/jeq2006.0017
Knox AS, Paller MH, Nelson EA, Specht WL, Halverson NV, Gladden JB. Metal distribution and stability in constructed wetland sediment. Journal of Environmental Quality. 2006 Sep;35(5):1948-1959. https://doi.org/10.2134/jeq2006.0017
Knox, Anna Sophia ; Paller, Michael H ; Nelson, Eric A. ; Specht, Winona L. ; Halverson, Nancy V. ; Gladden, John B. / Metal distribution and stability in constructed wetland sediment. In: Journal of Environmental Quality. 2006 ; Vol. 35, No. 5. pp. 1948-1959.
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