Application of persulfate-oxidation foam spraying as a bioremediation pretreatment for diesel oil-contaminated soil

Chemosphere
Rishikesh BajagainSeung-Woo Jeong

Abstract

This study investigated a persulfate-bioaugmentation serial foam spraying technique to remove total petroleum hydrocarbons (TPHs) present in diesel-contaminated unsaturated soil. Feeding of remedial agents by foam spraying increased the infiltration/unsaturated hydraulic conductivity of reagents into the unsaturated soil. Persulfate mixed with a surfactant solution infiltrated the soil faster than peroxide, resulting in relatively even soil moisture content. Persulfate had a higher soil infiltration tendency, which would facilitate its distribution over a wide soil area, thereby enhancing subsequent biodegradation efficiency. Nearly 80% of soil-TPHs were degraded by combined persulfate-bioaugmentation foam spraying, while bioaugmentation foam spraying alone removed 52%. TPH fraction analysis revealed that the removal rate for the biodegradation recalcitrant fraction (C18 to C22) in deeper soil regions was higher for persulfate-bioaugmentation serial foam application than for peroxide-bioaugmentation foam application. Persulfate-foam spraying may be superior to peroxide for TPH removal even at a low concentration (50 mN) because persulfate-foam is more permeable, persistent, and does not change soil pH in the subsurface. Althoug...Continue Reading

Citations

Apr 28, 2020·Environmental Science and Pollution Research International·Xiaodong LiQingbao Gu
Jun 15, 2019·Environmental Geochemistry and Health·Rishikesh BajagainSeung-Woo Jeong
Mar 10, 2020·Journal of Environmental Management·Verónica C MoraJanina A Rosso

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