Immobilization of Se(VI) in mine drainage by permeable reactive barriers: column performance

K. Sasaki, D. W. Blowes, C. J. Ptacek, W. D. Gould

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

The potential for immobilization of Se in mine drainage water using a permeable reactive barrier was investigated by a column study, in which the reactive components were zero valent Fe, municipal leaf compost, sawdust, and wood chips. These components were mixed with silica sand and gravel. Trace amounts of creek sediment were added to serve as a source of anaerobic bacteria. The influent concentration (40 mg L-1) of SeO42 - decreased to less than 2 mg L-1 within one week and to less than 0.014 mg L-1 within 1 month during passage through the column. In the column, the concentrations of SO42 - also were reduced from 620 to 220 mg L-1. After 2 months, cell populations of SO42 --reducing bacteria, estimated using the MPN method, were in the range of 106-107 cells g-1. Isotopic analysis of S showed δ34S = -9.19‰ for the input solution, and δ34S = -4.69‰ for the output solution. This change in isotopic ratio is attributed to the preferential utilization of 32 SO42 - over 32 SO42 - by SO4-reducing bacteria in the column. Geochemical calculations indicate that SeO42 - is stable in the influent water, and that conditions within the column favour reduction of SeO42 - to metallic Se or SeO32 -, and the reduction of SO42 - to S2-.

Original languageEnglish
Pages (from-to)1012-1022
Number of pages11
JournalApplied Geochemistry
Volume23
Issue number5
DOIs
Publication statusPublished - May 1 2008

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reactive barrier
mine drainage
immobilization
Drainage
Bacteria
Silica sand
Sawdust
Water
bacterium
Gravel
Wood
Sediments
Cells
isotopic analysis
drainage water
sand and gravel
isotopic ratio
compost
silica
sediment

All Science Journal Classification (ASJC) codes

  • Environmental Chemistry
  • Pollution
  • Geochemistry and Petrology

Cite this

Immobilization of Se(VI) in mine drainage by permeable reactive barriers : column performance. / Sasaki, K.; Blowes, D. W.; Ptacek, C. J.; Gould, W. D.

In: Applied Geochemistry, Vol. 23, No. 5, 01.05.2008, p. 1012-1022.

Research output: Contribution to journalArticle

Sasaki, K. ; Blowes, D. W. ; Ptacek, C. J. ; Gould, W. D. / Immobilization of Se(VI) in mine drainage by permeable reactive barriers : column performance. In: Applied Geochemistry. 2008 ; Vol. 23, No. 5. pp. 1012-1022.
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