Effect of long-term electrodialytic soil remediation on Pb removal and soil weathering

Gry Skibsted, Lisbeth M. Ottosen, Maria Elektorowicz, Pernille Erland Jensen*

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Weathering of soil minerals during long-term electrochemical soil remediation was evaluated for two different soils: an industrially Pb contaminated soil with high carbonate content and an unpolluted soil with low carbonate content. A constant current of 5 mA was applied for 842 days, and sampling was made 22 times during the treatment. The overall qualitative mineral composition was unaffected by electrodialysis, except for calcite removal which was complete. However, dissolution and removal of Al, Fe, Si, Mg, Ca and Pb from the soil during the treatment exceeded the fraction extractable by digestion in 7 M HNO3, and provided evidence of enhanced mineral dissolution induced by the current. Nevertheless, the total dissolved Si and Al only constituted 0.2-0.3% and 1.1-3.5% of the total content, while the Pb overall removal from the contaminated soil was only 8.1%. An observed reduction in the dry matter of 4.5% and 13.5% from the two soils, respectively was mainly due to dissolution of CaCO3 and organic matter, but also included a minor dissolution of other soil minerals.
Original languageEnglish
JournalJournal of Hazardous Materials
Volume358
Pages (from-to)459-466
Number of pages8
ISSN0304-3894
DOIs
Publication statusPublished - 2018

Keywords

  • Electrokinetics
  • Minerals
  • Pb
  • Soil
  • Weathering

Cite this

@article{0a141888662b4e65b84e65d8017238a2,
title = "Effect of long-term electrodialytic soil remediation on Pb removal and soil weathering",
abstract = "Weathering of soil minerals during long-term electrochemical soil remediation was evaluated for two different soils: an industrially Pb contaminated soil with high carbonate content and an unpolluted soil with low carbonate content. A constant current of 5 mA was applied for 842 days, and sampling was made 22 times during the treatment. The overall qualitative mineral composition was unaffected by electrodialysis, except for calcite removal which was complete. However, dissolution and removal of Al, Fe, Si, Mg, Ca and Pb from the soil during the treatment exceeded the fraction extractable by digestion in 7 M HNO3, and provided evidence of enhanced mineral dissolution induced by the current. Nevertheless, the total dissolved Si and Al only constituted 0.2-0.3{\%} and 1.1-3.5{\%} of the total content, while the Pb overall removal from the contaminated soil was only 8.1{\%}. An observed reduction in the dry matter of 4.5{\%} and 13.5{\%} from the two soils, respectively was mainly due to dissolution of CaCO3 and organic matter, but also included a minor dissolution of other soil minerals.",
keywords = "Electrokinetics, Minerals, Pb, Soil, Weathering",
author = "Gry Skibsted and Ottosen, {Lisbeth M.} and Maria Elektorowicz and Jensen, {Pernille Erland}",
year = "2018",
doi = "10.1016/j.jhazmat.2018.05.033",
language = "English",
volume = "358",
pages = "459--466",
journal = "Journal of Hazardous Materials",
issn = "0304-3894",
publisher = "Elsevier",

}

Effect of long-term electrodialytic soil remediation on Pb removal and soil weathering. / Skibsted, Gry; Ottosen, Lisbeth M.; Elektorowicz, Maria; Jensen, Pernille Erland.

In: Journal of Hazardous Materials, Vol. 358, 2018, p. 459-466.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Effect of long-term electrodialytic soil remediation on Pb removal and soil weathering

AU - Skibsted, Gry

AU - Ottosen, Lisbeth M.

AU - Elektorowicz, Maria

AU - Jensen, Pernille Erland

PY - 2018

Y1 - 2018

N2 - Weathering of soil minerals during long-term electrochemical soil remediation was evaluated for two different soils: an industrially Pb contaminated soil with high carbonate content and an unpolluted soil with low carbonate content. A constant current of 5 mA was applied for 842 days, and sampling was made 22 times during the treatment. The overall qualitative mineral composition was unaffected by electrodialysis, except for calcite removal which was complete. However, dissolution and removal of Al, Fe, Si, Mg, Ca and Pb from the soil during the treatment exceeded the fraction extractable by digestion in 7 M HNO3, and provided evidence of enhanced mineral dissolution induced by the current. Nevertheless, the total dissolved Si and Al only constituted 0.2-0.3% and 1.1-3.5% of the total content, while the Pb overall removal from the contaminated soil was only 8.1%. An observed reduction in the dry matter of 4.5% and 13.5% from the two soils, respectively was mainly due to dissolution of CaCO3 and organic matter, but also included a minor dissolution of other soil minerals.

AB - Weathering of soil minerals during long-term electrochemical soil remediation was evaluated for two different soils: an industrially Pb contaminated soil with high carbonate content and an unpolluted soil with low carbonate content. A constant current of 5 mA was applied for 842 days, and sampling was made 22 times during the treatment. The overall qualitative mineral composition was unaffected by electrodialysis, except for calcite removal which was complete. However, dissolution and removal of Al, Fe, Si, Mg, Ca and Pb from the soil during the treatment exceeded the fraction extractable by digestion in 7 M HNO3, and provided evidence of enhanced mineral dissolution induced by the current. Nevertheless, the total dissolved Si and Al only constituted 0.2-0.3% and 1.1-3.5% of the total content, while the Pb overall removal from the contaminated soil was only 8.1%. An observed reduction in the dry matter of 4.5% and 13.5% from the two soils, respectively was mainly due to dissolution of CaCO3 and organic matter, but also included a minor dissolution of other soil minerals.

KW - Electrokinetics

KW - Minerals

KW - Pb

KW - Soil

KW - Weathering

U2 - 10.1016/j.jhazmat.2018.05.033

DO - 10.1016/j.jhazmat.2018.05.033

M3 - Journal article

VL - 358

SP - 459

EP - 466

JO - Journal of Hazardous Materials

JF - Journal of Hazardous Materials

SN - 0304-3894

ER -