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09월 04일 17시 이후 : 초록수정 불가능, 일정확인 및 검색만 가능
제114회 대한화학회 학술발표회, 총회 및 기기전시회 안내
Effects of soil particle size and micropore volume on TPH removal from contaminated soils
2014년 8월 28일 16시 26분 16초
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10월 15일 (수요일) 16:00~19:00
한국과학기술연구원(KIST) 천연물융합연구센터, Korea
고려대학교 고려대학교, Korea
To remediate soils contaminated by petroleum hydrocarbons, a variety of physical, chemical, and microbiological techniques have been investigated. However, it has been frequently reported that remediation efficiency decreased in the presence of the large portion of soil fine particles. Thus, it is important to understand how soil micro-environments (mainly microparticles and micropores) affect the release of total petroleum hydrocarbons (TPH) in contaminated soils. In this study, we investigate 1) distribution of TPH in contaminated soils with various particle sizes, 2) the rate and extent of TPH release during physical and chemical extraction, and 3) variation of TPH in in-situ contaminated sites where surfactant was injected for TPH removal. Six contaminated soils were separated based on various particle sizes (i.e., >2mm, <2mm, 2-0.063mm, <0.063mm) and TPH concentrations were determined according the Korean official soil test method. The release of TPH from contaminated soils was also monitored with sonication time. Concentrations of TPH in all six soils were higher as the particle size of each soil decreases likely because of more surface area and micropores in fine particles. To determine the effects of microparticles and/or micropores on TPH distribution in soil, TPH extraction by sonification with dichloromethane from contaminated soil was performed. TPH extracted during sonification rapidly increased in 0.5 min and then slowly increased for 10 min, while total pore volumes (< 0.38 mm) sharply decreased in 0.5 min and slowly decreased to 0.002 cc g-1 in 10 min. These results imply that physical (sonification) and chemical (solvent extraction) impacts can enhance TPH release from contaminated soils by destructing soil micropores and TPH desorption from microparticles. A strong correlation between TPH and soil micro-environments suggests that TPH can strongly bind to micropores as well as the surface of microparticles. A field study by employing in-situ samplers in monitoring wells in a diesel contaminated site is also ongoing to examine the effect of soil microenvironments on in-situ TPH distribution. The effects of soil micro-environments on TPH removal should be investigated to better understand TPH behavior in contaminated soils and to develop an effective solution for oil-contaminated lands.
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