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

作者：Bajagain Rishikesh; Lee Sojin; Jeong Seung Woo^*

来源：Chemosphere, 2018, 207: 565-572.

DOI：10.1016/j.chemosphere.2018.05.081

• Total petroleum hydrocarbon (TPH)
• Surfactant foam
• Diesel-contaminated soil
• Soil moisture content
• Hydrogen peroxide
• Bioaugmentation

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 (C-18 to C-22) 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.

• 出版日期2018-9