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J Korean Soc Environ Eng > Volume 38(3); 2016 > Article
J Korean Soc Environ Eng 2016;38(3): 135-143. doi: https://doi.org/10.4491/KSEE.2016.38.3.135
오염된 해양퇴적물 내 Cd, Cr, Cu, Zn의 용출차단과 안정화를 위한 천연 제올라이트와 모래 피복의 적용
강구1, 김영기2, 박성직3
1한경대학교 미래융합기술대학원
2한경대학교 화학공학과
3한경대학교 지역자원시스템공학과
Natural Zeolite and Sand Capping Treatment for Interrupting the Release of Cd, Cr, Cu, and Zn from Marine Contaminated Sediment and Stabilizing the Heavy Metals
Ku Kang1, Young-Kee Kim2, Seong-Jik Park3
1Graduate School of Future Convergence Technology, Hankyong National University
2Department of Chemical Engineering, Hankyong National University
3Department of Bioresources & Rural systems Engineering, Hankyong National University
Corresponding author  Seong-Jik Park ,Tel: 031-670-5131, Fax: 031-670-5139, Email: parkseongjik@hknu.ac.kr
Received: January 25, 2016;  Revised: February 25, 2016;  Accepted: March 11, 2016.  Published online: March 31, 2016.
ABSTRACT
We investigated the effectiveness of natural zeolite (NZ) and sand (SD) as a capping material to block the release of heavy metals (Cd, Cr, Cu, and Zn) from heavily contaminated marine sediments and stabilize these heavy metals in the sediments. The efficiency of NZ and SD for blocking trace metals was evaluated in a flat flow tank attached with an impeller to generate wave. 0, 10, 30, and 50 mm depth of NZ or SD were capped on the contaminated marine sediments and the metal concentration in seawater was monitored. After completion of flow tank experiments, sequential extractions of the metals in the sediment below the capping material were performed. The difference of pH, EC, and DO concentration between uncapped and capped condition was not significant. The release of cations including Cd, Cu, and Zn were effectively blocked by NZ and SD capping but the interruption of Cr release was observed only in 50 mm depth of SD capped condition. However, the stabilization of Cr in 50 mm depth of SD capped condition was not achieved when compared to uncapped condition. NZ and SD capping were effective for stabilizing Cd, Cu, and Zn in marine sediments. It is concluded that the use of NZ with SD as a capping material is recommended for blocking Cd, Cr, Cu, and Zn release and stabilizing them in contaminated marine sediments.
Key Words: In-situ Capping, Natural Zeolite, Sand, Heavy Metals, Marine Sediment
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