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Concentrations, Speciation, and Potential Release of Hazardous Heavy Metals from the Solid Combustion Residues of Coal-Fired Power Plants
Yiming Huang; Jinling Liu; Guan Wang; Xiangyang Bi; Guangyi Sun; Xian Wu; Qingfeng Wang; Zhonggen Li
2022
Source PublicationInternational Journal Environmental Research Public Health
Pages12617
Abstract

Hazardous heavy metal-laden coal combustion byproducts exposed to precipitation or surface/groundwater are of environmental concern. This study analyzed fly ash (FA) and desulfurization gypsum (FGD gypsum) samples obtained from 16 coal-fired power plants in Guizhou Province, China. A combination of field and laboratory studies was used to investigate the binding forms of lead (Pb), cadmium (Cd), and chromium (Cr) and their leaching characteristics under natural storage conditions. The results showed that there were significant proportions of residual states of these elements in FA (84–99% for Pb, 83–91% for Cd, and 73–97% for Cr), indicating a lack of migration to other environmental media. FGD gypsum contained high proportions of metals in migratable states, but the environmental risks were low due to their very low concentrations. The release of Pb, Cd, and Cr from FA and FGD gypsum into extracts varied according to pH. This is related to the form of each element in the solid and the series of reactions that occurs during the leaching process. However, aside from Cr in FA, all heavy metals in FA and FGD gypsum samples were present in concentrations below the relevant standards for landfill leachate, indicating very low release rates. The Cr levels (206–273 g/L) in some of the FA extracts were higher than the limits for water pollution from domestic landfill, indicating that Cr in FA poses a leaching risk. The results of field leachate sampling and indoor simulated rainfall experiments further validated these findings,indicating that the release of Cr from stockpiled coal FA is a cause for concern.

KeywordHeavy Metal Coal Fly Ash Desulfurization Gypsum Leachability Sequential Extraction Pollution
DOI10.3390/ ijerph191912617
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Indexed BySCI
Language英语
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Document Type期刊论文
Identifierhttp://ir.gyig.ac.cn/handle/42920512-1/13518
Collection环境地球化学国家重点实验室
Affiliation1.School of Resources and Environment, Zunyi Normal College, Zunyi 563006, China
2.School of Earth Sciences, China University of Geosciences, Wuhan 430074, China
3.MOE Laboratory for Earth Surface Processes, College of Urban and Environmental Sciences, Peking University, Beijing 100871, China
4.State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China
Recommended Citation
GB/T 7714
Yiming Huang,Jinling Liu,Guan Wang,et al. Concentrations, Speciation, and Potential Release of Hazardous Heavy Metals from the Solid Combustion Residues of Coal-Fired Power Plants[J]. International Journal Environmental Research Public Health,2022:12617.
APA Yiming Huang.,Jinling Liu.,Guan Wang.,Xiangyang Bi.,Guangyi Sun.,...&Zhonggen Li.(2022).Concentrations, Speciation, and Potential Release of Hazardous Heavy Metals from the Solid Combustion Residues of Coal-Fired Power Plants.International Journal Environmental Research Public Health,12617.
MLA Yiming Huang,et al."Concentrations, Speciation, and Potential Release of Hazardous Heavy Metals from the Solid Combustion Residues of Coal-Fired Power Plants".International Journal Environmental Research Public Health (2022):12617.
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