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Laboratory and pilot scale soil washing of PAH and arsenic from a wood preservation site: Changes in concentration and toxicity
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2009 (English)In: Journal of Hazardous Materials, ISSN 0304-3894, E-ISSN 1873-3336, Vol. 172, no 2-3, 1033-1040 p.Article in journal (Refereed) Published
Abstract [en]

Soil washing of a soil with a mixture of both polycyclic aromatic hydrocarbons (PAH) and As was evaluated in laboratory and pilot scale, utilizing both single and mixtures of different additives. The highest level of decontamination was achieved with a combination of 0.213 M of the chelating agent MGDA and 3.2 x CMC* of a non-ionic, alkyl glucoside surfactant at pH 12 (Ca(OH)(2)). This combination managed to reach Swedish threshold values within 10 min of treatment when performed at elevated temperature (50 degrees C), with initial contaminant concentrations of As = 105 +/- 4 mg/kg and US-EPA PAH(16) = 46.0 +/- 2.3 mg/kg. The main mechanisms behind the removal were the pH effect for As and a combination of SOM ionization as a result of high pH and micellar solubilization for PAHs. Implementation of the laboratory results utilizing a pilot scale equipment did not improve the performance, which may be due to the shorter contact time between the washing solution and the particles, or changes in physical characteristics of the leaching solution due to the elevated pressure utilized. The ecotoxicological evaluation, Microtox (R), demonstrated that all soil washing treatments increased the toxicity of soil leachates, possibly due to increased availability of contaminants and toxicity of soil washing solutions to the test organism. (C) 2009 Elsevier B.V. All rights reserved.

Place, publisher, year, edition, pages
2009. Vol. 172, no 2-3, 1033-1040 p.
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Natural Sciences
Identifiers
URN: urn:nbn:se:mdh:diva-19844DOI: 10.1016/j.jhazmat.2009.07.092ISI: 000271980800068Scopus ID: 2-s2.0-71049155866OAI: oai:DiVA.org:mdh-19844DiVA: diva2:635762
Available from: 2013-07-05 Created: 2013-06-26 Last updated: 2013-12-19Bibliographically approved

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Ribé, VeronicaWaara, SylviaAllard, Bert
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CiteExportLink to record
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Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
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  • Other locale
More languages
Output format
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