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J Korean Soc Environ Eng > Volume 37(2); 2015 > Article
J Korean Soc Environ Eng 2015;37(2): 113-119. doi: https://doi.org/10.4491/KSEE.2015.37.2.113
아임계수 분해를 이용한 난분해성 물질로 오염된 토양의 정화 연구
최재헌1, 이환1, 이철효1, 김주엽1, 오석영2
1대일이앤씨
2울산대학교 건설환경공학과
Remediation of Soil Contaminated with Persistent Organic Pollutants through Subcritical Water Degradation
Jae-Heon Choi1, Hwan Lee1, Cheol-Hyo Lee1, Ju-Yup Kim1, Seok-Young Oh2
1Daeil Engineering and construction Co., Ltd
2Department of Civil and Environmental Engineering, University of Ulsan
Corresponding author  Jae-Heon Choi ,Tel: 031-881-4751, Fax: 031-881-4756, Email: jhchoi999@lycos.co.kr
Received: October 31, 2014;  Revised: November 20, 2014;  Accepted: February 26, 2015.  Published online: February 28, 2015.
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℃. 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.
Key Words: Polychlorinated Biphenyls (PCBs), Subcritical Water, Soil Remediation, Persistent Organic Pollutants
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