Research Paper
Econ. Environ. Geol. 2024; 57(6): 803-810
Published online December 31, 2024
https://doi.org/10.9719/EEG.2024.57.6.803
© THE KOREAN SOCIETY OF ECONOMIC AND ENVIRONMENTAL GEOLOGY
Optimum Conditions of Thermal Treatment for Mercury Contaminated Agricultural Soil in Abandoned Mine Areas
Correspondence to : *greenidea@hoseo.edu
This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided original work is properly cited.
Abstract
In this study, we investigated the feasibility and optimum treatment conditions (temperature and retention time) of thermal desorption for agricultural soil contaminated by mercury in an abandoned mine area. With a retention time of 2 hours, mercury concentration decreased as heating temperature, 100 ℃ to 700 ℃, increased. Eventually, a temperature of 200 ℃ with a retention time of 3 hours was suggested as the optimum condition of thermal desorption to meet the Korean environmental standard and maintain soil functions for agricultural use. 54 % of mercury existed as elemental mercury in the studied soil, and this species was dramatically decreased after the treatment. Therefore, thermal desorption with a lower temperature range and longer retention time has a feasibility for remediation of mercury contaminated soil in abandoned mine areas.
Keywords mercury, soil, thermal desorption, fractionation, abandoned mine
폐광산지역 수은오염 토양 정화를 위한 열탈착 조건 검토
고일하1 · 이민현1 · 권요셉1,2 · 고주인3 · 지원현4,*
1환경기술정책연구원 (NeLab)
2세종대학교 에너지자원공학과
3한국광해광업공단 기술연구원
4호서대학교 일반대학원 에너지기후환경융합기술학과
요 약
본 연구에서는 폐광산 수은오염 농경지 토양을 대상으로 열탈착 기술의 적용성과 최적 처리조건을 검토하였다. 탈착 유지시간을 2시간으로 고정한 후 온도(100℃ ~ 700℃)별 처리효율을 검토한 결과 온도증가에 따른 수은 농도 감소가 확인되었다. 최종적으로 국내 환경기준 만족여부, 토양기능 유지여부 등을 종합했을 때 200℃ 3시간이 최적 처리조건인 것으로 나타났다. 대상토양 내 수은은 54 %가 원소수은으로 존재하였고, 탈착 처리 후 본 형태가 크게 감소하였다. 따라서 같은 수은오염 토양이라도 원소수은 함량이 높은 토양은 저온 영역대의 열처리가 가능하므로, 에너지 소비 관점에서 광산지역 토양에 대한 열탈착 기술의 현장 적용성이 큰 것으로 판단된다.
주요어 수은, 토양, 열탈착, 존재형태, 폐광산
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Research Paper
Econ. Environ. Geol. 2024; 57(6): 803-810
Published online December 31, 2024 https://doi.org/10.9719/EEG.2024.57.6.803
Copyright © THE KOREAN SOCIETY OF ECONOMIC AND ENVIRONMENTAL GEOLOGY.
Optimum Conditions of Thermal Treatment for Mercury Contaminated Agricultural Soil in Abandoned Mine Areas
Il-Ha Koh1, Min-Hyeon Lee1, Yo Seb Kwon1,2, Ju In Ko3, Won Hyun Ji4,*
1National Environment Lab. (NeLab), Seoul 02841, Korea
2Department of Energy and Mineral Resources Engineering, Sejong University, Seoul 05006, Korea
3Technology Research & Development Institute, Korea Mine Rehabilitation and Mineral Resources Corporation, Wonju 26464, Korea
4Department of Energy & Climate Environment Fusion Technology, Graduate School, Hoseo University, Asan 31499, Korea
Correspondence to:*greenidea@hoseo.edu
This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided original work is properly cited.
Abstract
In this study, we investigated the feasibility and optimum treatment conditions (temperature and retention time) of thermal desorption for agricultural soil contaminated by mercury in an abandoned mine area. With a retention time of 2 hours, mercury concentration decreased as heating temperature, 100 ℃ to 700 ℃, increased. Eventually, a temperature of 200 ℃ with a retention time of 3 hours was suggested as the optimum condition of thermal desorption to meet the Korean environmental standard and maintain soil functions for agricultural use. 54 % of mercury existed as elemental mercury in the studied soil, and this species was dramatically decreased after the treatment. Therefore, thermal desorption with a lower temperature range and longer retention time has a feasibility for remediation of mercury contaminated soil in abandoned mine areas.
Keywords mercury, soil, thermal desorption, fractionation, abandoned mine
폐광산지역 수은오염 토양 정화를 위한 열탈착 조건 검토
고일하1 · 이민현1 · 권요셉1,2 · 고주인3 · 지원현4,*
1환경기술정책연구원 (NeLab)
2세종대학교 에너지자원공학과
3한국광해광업공단 기술연구원
4호서대학교 일반대학원 에너지기후환경융합기술학과
요 약
본 연구에서는 폐광산 수은오염 농경지 토양을 대상으로 열탈착 기술의 적용성과 최적 처리조건을 검토하였다. 탈착 유지시간을 2시간으로 고정한 후 온도(100℃ ~ 700℃)별 처리효율을 검토한 결과 온도증가에 따른 수은 농도 감소가 확인되었다. 최종적으로 국내 환경기준 만족여부, 토양기능 유지여부 등을 종합했을 때 200℃ 3시간이 최적 처리조건인 것으로 나타났다. 대상토양 내 수은은 54 %가 원소수은으로 존재하였고, 탈착 처리 후 본 형태가 크게 감소하였다. 따라서 같은 수은오염 토양이라도 원소수은 함량이 높은 토양은 저온 영역대의 열처리가 가능하므로, 에너지 소비 관점에서 광산지역 토양에 대한 열탈착 기술의 현장 적용성이 큰 것으로 판단된다.
주요어 수은, 토양, 열탈착, 존재형태, 폐광산
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