• Title/Summary/Keyword: 방사성토양

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Analysis of Sorption and Desorption Behaviors of Radionuclides (Cobalt and Strontium) in Natural Soil (자연 토양에서의 방사성 핵종(Co, Sr)의 흡/탈착 거동 특성 평가)

  • Cheon Kyeong-Ho;Shin Won Sik;Choi Jeong-Hak;Choi Sang June
    • Proceedings of the Korean Radioactive Waste Society Conference
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    • 2005.06a
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    • pp.485-495
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    • 2005

  • This study was conducted to investigate sorption and desorption behaviors of radionuclides (Cobalt and Strontium) in natural soil. Sorption kinetics and isotherms were analyzed to predict sorption behaviors of radionuclides in natural soil and the experimental data were fitted to several sorption models. Desorption experiments were also performed with or without CMCD at constant pH and ion strength conditions. The results showed that $Sr^{2+}$ was more strongly sorbed than $Co^{2+}$ in natural soil. Both $Co^{2+}$ and $Sr^{2+}$ followed a pseudo-second order kinetics and Sips model. The desorption-resistance of $Co^{2+}$ and $Sr^{2+}$ was estimated using a natural surfactant Carboxymethyl-${\beta}$-cyclodextrin(CMCD) or non-desorbing fraction. Desorption of radionuclides was partially irreversible and $Sr^{2+}$ was more resistant than $Co^{2+}$ Addition of CMCD facilitated desorption of $Co^{2+}$ and $Sr^{2+}$ from soil.

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초임계 이산화탄소를 응용한 개질 제강 슬래그의 Cs 및 Co 이온의 제거 특성

  • 김민길;원휘준;현재혁;김계남;오원진;정종헌
    • Proceedings of the Korean Radioactive Waste Society Conference
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    • 2004.06a
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    • pp.122-123
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    • 2004

  • 산업체에서 폐기물로 발생되는 제강 슬래그를 사용전 초임계 이산화탄소를 이용해 고온 고압에서 전처리를 통해 얻어진 제강 슬래그를 이용하여 토양 제염 후 발생하는 방사성 폐액 중에 포함되어 있는 성분 가운데 방사성이 높은 성분인 Cs 이온과 Co 이온을 제거하는데 활용함으로서 폐기물의 재활용에 의한 방사성 이온 제거 방안을 모색해 보고자 하였으며 이에 대한 연구는 환경보호 차원뿐만 아니라 폐기물 자원 회수라는 측면에서도 그 중요성이 크다고 할 수 있다.(중략)

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Groundwater and Soil Pollution Caused by Forest Fires, and Its Effects on the Distribution and Transport of Radionuclides in Subsurface Environments: Review (산불에 의한 지하수 토양 환경오염과 방사성 물질 분포 및 거동 영향 고찰)

  • Hyojin Bae;Sungwook Choung;Jungsun Oh;Jina Jeong
    • Economic and Environmental Geology
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    • v.56 no.5
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    • pp.501-514
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    • 2023

  • Forest fires can generate numerous pollutants through the combustion of vegetation and cause serious environmental problems. The global warming and climate change will increase the frequency and scale of forest fires across the world. In Korea, many nuclear power plants (NPPs) are located in the East Coast where large-scale forest fires frequently occur. Therefore, understanding the sorption and transport characteristics of radionuclides in the forest fire areas is required against the severe accidents in NPPs. This article reviewed the physiochemical changes and contamination of groundwater and soil environments after forest fires, and discussed sorption and transport of radionuclides in the subsurface environment of burned forest area. We considered the geochemical factors of subsurface environment changed by forest fire. Moreover, we highlighted the need for studies on changes and contamination of subsurface environments caused by forest fires to understand more specific mechanisms.

  • https://doi.org/10.9719/EEG.2023.56.5.501 인용 PDF