Application of persulfate-oxidation foam spraying as a bioremediation pretreatment for diesel oil-contaminated soil. (September 2018)

• Record Type: Journal Article
• Authors: Bajagain, Rishikesh; Lee, Sojin; Jeong, Seung-Woo
• Is Part Of: Chemosphere. Volume 207(2018)
• Page Start: 565
• Page End: 572
• Publication Date: 2018-09
• Subjects: Total petroleum hydrocarbon (TPH) -- Surfactant foam -- Diesel-contaminated soil -- Soil moisture content -- Hydrogen peroxide -- Bioaugmentation; Pollution -- Periodicals; Pollution -- Physiological effect -- Periodicals; Environmental sciences -- Periodicals; Atmospheric chemistry -- Periodicals; 551.511
• DOI: 10.1016/j.chemosphere.2018.05.081
• Languages: English
• ISSNs: 0045-6535

Abstract

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. Although the number of soil microbes declines by oxidation pretreatment, bioaugmentation-foam alters the microbial population exponentially. Highlights: Feeding of remedial agents by foam spraying increased infiltration into the soil. Persulfate plus surfactant solution infiltrated into the soil faster than peroxide. Persulfate-foam pre-oxidized TPH for enhanced biodegradation efficiency. Surfactant foam spraying enhanced TPH removal in oil contaminated soil. Two pore volumes of solution was sufficient for TPH removal in contaminated soil.