PMID: 16634228Apr 26, 2006Paper

Leaching of heavy metals in acid mine drainage

Waste Management & Research : the Journal of the International Solid Wastes and Public Cleansing Association, ISWA
Lana SariaKentaro Miyawaki

Abstract

Acid mine drainage is one of the most serious environmental problems that the coal and metal mining industry is currently facing. The generation of low pH drainage enhances the dissolution of heavy metals in water. The samples used in this research originated from three pits at mine dumps. In a study reported in this paper, three types of tests; namely static test, kinetic test and column test were conducted to estimate acid generation and acid neutralization reaction rates, and to predict the solubility of metals and their release rates. Static test showed that all samples had a pH of net acid generation (NAG pH) <4, a net acid producing potential (NAPP) >10 kg H2SO4tonne(-1), and a S-content >3%, which can be classified as a high acid-forming capacity. Simulated runoff in the column tests was equivalent to 5-year average rainfall in Indonesia, the resultant leachates showed acidic behaviour (pH < 3.5). Based on the results, it was found that high mobilization of heavy metals (Cr, Cu, Zn, Cd and Pb) takes place under strong acidic conditions (pH approximately equal 2).

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Citations

May 27, 2015·Environmental Monitoring and Assessment·Zohreh MohammadiKimia Sadat Ajayebi
Apr 13, 2011·Journal of Environmental Monitoring : JEM·Stanley MoyoNtebogeng Mokgalaka-Matlala
Jul 12, 2021·The Science of the Total Environment·Chani WelchM Jim Hendry

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