Long-term leaching of As, Cd, Mo, Pb, and Zn from coal fly ash in column test

Globally, millions of tons of coal fly ash (CFA) are generated per year, and the majority of this material is usually stored in stock piles or landfills, and in a long-term, it can be an environmental hazard if rainwater infiltrates the ashes. Long-term leaching studies of Brazilian ashes are scarce...

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Bibliographic Details
Published in:Environmental monitoring and assessment 2019-10, Vol.191 (10), p.602-12, Article 602
Main Authors: Lange, C. N., Flues, M., Hiromoto, G., Boscov, M. E. G., Camargo, I. M. C.
Format: Article
Language:English
Subjects:
Acid rain
Arsenic
Ashes
Atmospheric Protection/Air Quality Control/Air Pollution
Cadmium
Coal
Earth and Environmental Science
Ecology
Ecotoxicology
Electric power generation
Environment
Environmental hazards
Environmental Management
Environmental monitoring
Environmental science
Fly ash
Groundwater
Landfills
Leaching
Lead
Molybdenum
Monitoring/Environmental Analysis
Power plants
Precipitation
Rain
Rain water
Rainfall
Rainy season
Seasonal variations
Seasonality
Soil
Temperature
Wet season
Zinc
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Summary:Globally, millions of tons of coal fly ash (CFA) are generated per year, and the majority of this material is usually stored in stock piles or landfills, and in a long-term, it can be an environmental hazard if rainwater infiltrates the ashes. Long-term leaching studies of Brazilian ashes are scarce. The purpose of this study was to evaluate arsenic, cadmium, molybdenum, lead, and zinc leaching behavior from a Brazilian CFA by a column experiment designed to simulate field conditions: slightly acid rain considering seasonality of precipitation and temperature for a long-term leaching period (336 days). All elements were leached from CFA, except lead. Elements leaching behavior was influenced by leaching time, leaching volume, and temperature. Higher leachability of As and Cd from CFA during warm and wet season was observed. Results indicate a potential risk to soil and groundwater, since ashes are usually stored in uncovered fields on power plants vicinity.
ISSN:0167-6369
1573-2959
DOI:10.1007/s10661-019-7798-0