Taillard, Vincent 
ORCID: https://orcid.org/0000-0003-4004-9522; Abolhosseini, Pejman; Martel, Richard ORCID: https://orcid.org/0000-0003-4219-5582; Pasquier, Louis-César ORCID: https://orcid.org/0000-0002-7155-3257; Blais, Jean-François ORCID: https://orcid.org/0000-0003-3087-4318; Mercier, Guy et Boulanger-Martel, Vincent
(2025).
Cold ISCO For Permafrost Preservation: Diesel Remediation With Alkali-Activated Persulfate.
Water, Air, & Soil Pollution
, vol. 236
, nº 10.
p. 679.
DOI: 10.1007/s11270-025-08325-z.
Résumé
A laboratory batch and column testing study was conducted to assess the remediation efficiency of an innovative cold in situ chemical oxidation (ISCO) technology involving sodium persulfate (SPS) alkali activated with calcium peroxide (CP) to degrade diesel from a representative subarctic soil. Limited temperature increase during the diesel degradation process was a major concern since the technology is dedicated to cold regions where permafrost must be preserved from thawing. A series of batch tests was conducted at ambient temperature with different SPS-to-diesel mass ratios, CP-to-SPS molar ratios, and initial diesel concentrations of 5,000 mg/kg and 7,500 mg/kg. The highest removal efficiency of 25% was obtained considering a SPS-to-diesel mass ratio of 30:1 and a CP-to-SPS molar ratio of 1:1 after a 21-day period. The maximum temperature increase did not exceed 3 °C. Optimal conditions were subsequently implemented at cold temperature (5.3 °C), leading to a 21% diesel removal while limiting the maximum temperature increase to 2.5 °C. Column tests with the same contaminated soil were performed at cold temperature to simulate the distribution of the oxidative solution in subarctic saturated soil. The optimized injection strategy of the solution resulted in 44.4% diesel removal after one month while limiting the accumulation of byproducts that could clog the soil pores. Remediation of a diesel spill affecting subarctic soil could be performed over one operational period of 3 months while limiting the impact of the treatment on the permafrost.
| Type de document: | Article |
|---|---|
| Mots-clés libres: | sodium persulfate; oxidation; calcium peroxide; diesel; Arctic; contaminated soil |
| Centre: | Centre Eau Terre Environnement |
| Date de dépôt: | 26 août 2025 19:08 |
| Dernière modification: | 26 août 2025 19:08 |
| URI: | https://espace.inrs.ca/id/eprint/16578 |
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