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J Environ Sci Health A Tox Hazard Subst Environ Eng

Title:		Removal of non-aqueous phase liquids (NAPLs) from TPH-saturated sandy aquifer sediments using in situ air sparging combined with soil vapor extraction
Author(s):		Lee JH; Woo HJ; Jeong KS;
Address:		"a Korean Seas Geosystem Research Unit, Korea Institute of Ocean Science & Technology , Busan , Republic of Korea"
Journal Title:		J Environ Sci Health A Tox Hazard Subst Environ Eng
Year:		2018
Volume:		20190109
Issue:		14
Page Number:		1253 - 1266
DOI:		10.1080/10934529.2018.1528040
ISSN/ISBN:		1532-4117 (Electronic) 1093-4529 (Linking)
Abstract:		"Contamination in coastal aquifer plains is of great concern in many countries given that non-aqueous phase liquids (NAPLs) have polluted numerous sites through accidental oil spills or improper disposal. We have developed a method to remove pollutants such as NAPLs from sandy sediment samples collected from the Mandol area of Gomso Bay in western South Korea. The sediments were collected from around the diffuser in a two-dimensional (2D) acrylic reaction apparatus, and these contained a total petroleum hydrocarbon (TPH) concentration of 89.3 ppm (mg/kg media). The maximum perchloroethylene (PCE) concentration was 398.51 ppm in the unsaturated zone and 0.77 ppm in the saturated zone. Volatile organic compounds (VOCs) were detected between 20 and 44 hour. However, non-volatile contaminants remained in the sediments after treatment. In situ air sparging (IAS) combined with soil vapor extraction (SVE), transformation from sorbed and nonaqueous phases to the vapor phase, is incomplete when treatment is performed using a pervasive air flow for sediments such as the sand of Mandol. During air transformation, the groundwater flow conditions increased the rate of contaminant removal. Although pilot-scale testing in the field site was fluctuated due to the heterogeneous of sediments condition, this 2D study found that the proposed method can alter the measurable geophysical properties of NAPLs. These findings demonstrate that IAS combined with SVE in the saturated zone is an effective technology for aquifer remediation high applicability of sandy coastal sediments contaminated by NAPLs"
Keywords:		Environmental Pollution Environmental Restoration and Remediation/*methods Gases/isolation & purification Geologic Sediments/*chemistry Groundwater/*chemistry Humans Hydrocarbons/*isolation & purification Petroleum/toxicity *Petroleum Pollution Republic o;
Notes:		"MedlineLee, Jun-Ho Woo, Han Jun Jeong, Kap-Sik eng Evaluation Study England 2019/01/10 J Environ Sci Health A Tox Hazard Subst Environ Eng. 2018; 53(14):1253-1266. doi: 10.1080/10934529.2018.1528040. Epub 2019 Jan 9"