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Investigation on the Leaching Potential of Water-Soluble Metals from Bottom Ashes in Coal-fired Power Plants

화력발전소 바닥재의 수용성 금속이온 용출가능성 조사

Hyosik Seo12
,
Dong-Chan Koh12
,
Hanna Choi1*
서효식 12
,
고동찬 12
,
최한나 1*
1 Korea Institute of Geoscience and Mineral Resources, Daejeon 34132, Korea
2 Geological Science, University of Science and Technology, Daejeon 34113, Korea
1 한국지질자원연구원 기후변화대응본부 지하수환경연구센터
2 과학기술연합대학원대학교 지질과학
*Corresponding Author
28 February 2022. pp. 39-49
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Abstract

Bottom ash generated from thermal power plants is mainly disposed in landfills, from which metals may be leached by infiltrating water. To evaluate the effect of metals in leachate on soil and groundwater, we characterized bottom ash generated from burning cokes, bituminous coal, the mixture of bituminous coal and wood pellets, and charcoal powder. The bottom ash of charcoal powder had a relatively large particle size, and its wood texture was well-preserved from SEM observation. The bottom ash of charcoal powder and wood pellets had relatively high K concentration from total element analysis. The eluates of the bottom ash samples had appreciable concentrations of Ca, Al, Fe, SO 4, and NO 3, but they were not a significant throughout the batch test. Therefore, it is considered that there is low possibility of soil and groundwater contamination due to leaching of metal ions and anions from these bottom ash in landfills. To estimate the trend of various trace elements, long-term monitoring and additional analysis need to be performed while considering the site conditions, because they readily adsorb on soil and aquifer substances.

Keywords
bottom ash
thermal power plants
landfill
infiltrate
leaching components
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Information
  • Publisher :The Korean Society of Soil and Groundwater Environment
  • Publisher(Ko) :한국지하수토양환경학회
  • Journal Title :Journal of Soil and Groundwater Environment
  • Journal Title(Ko) :지하수토양환경
  • Volume : 27
  • No :1
  • Pages :39-49
  • Received Date : 2022-01-21
  • Revised Date : 2022-01-27
  • Accepted Date : 2022-02-17
  • DOI :https://doi.org/10.7857/JSGE.2022.27.1.039
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