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http://dx.doi.org/10.4491/KSEE.2015.37.2.113

Remediation of Soil Contaminated with Persistent Organic Pollutants through Subcritical Water Degradation  

Choi, Jae-Heon (Daeil Engineering and construction Co., Ltd.)
Lee, Hwan (Daeil Engineering and construction Co., Ltd.)
Lee, Cheol-Hyo (Daeil Engineering and construction Co., Ltd.)
Kim, Ju-Yup (Daeil Engineering and construction Co., Ltd.)
Oh, Seok-Young (Department of Civil and Environmental Engineering, University of Ulsan)
Publication Information
Journal of Korean Society of Environmental Engineers / v.37, no.2, 2015 , pp. 113-119 More about this Journal
Abstract
This study examined remediation of soil contaminated with polychlorinated biphenyls (PCBs) and other persistent organic pollutants by using subcritical water. Our results showed that removal efficiency of PCBs from soil and treatment temperature were linearly proportional under subcritical conditions. The removal efficiency as increased as reacting period increased. PCBs contaminating fine particles in soil were less effectively removed than those in entire contaminated soil. Reaction of the zero-valent iron and PCBs under subcritical condition produced dechlorinated product, where most of the PCBs were oxidised while little remained as dechlorinated. Other organic pollutants, such as TPH, BTEX, TCE/PCE, and chlorpyrifos, were removed by more than 90% at $300^{\circ}C$. Considering removal efficiency and identification of by-products, we suggest that subcritical water treatment may be effectively applied to soils contaminated with various persistent organic pollutants.
Keywords
Polychlorinated Biphenyls (PCBs); Subcritical Water; Soil Remediation; Persistent Organic Pollutants;
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