Leaching Characteristics of Heavy Metals in the Bottom Ash from Circulating Fluidized Bed Combustion, in Order for Application to Limestone Mine Backfilling

Acid mine drainage(AMD) treatment is classified as both passive and active treatment. During the treatment, about 5,000 tons of neutralization sludge is generated as a by-product per year in Korea. This study was conducted to evaluate the characteristics of sludge generated from physico•chemical treatment processes as an active treatment from 5 different sources (D, H, S, T, Y) and the possibility of the sludges being recycled. The sludges have a pH range of 5.86 ~ pH 7.89, and a water content range of 51% ~ 82%. Most of particle sizes were less than 25 µm. In analysis of inorganic elements, the concentration of Al, Fe, and Mn were between 1,189 mg/kg ~ 129,344 mg/kg, 106,132 mg/kg ~ 338,011 mg/kg, and 3,472 mg/kg ~ 11,743 mg/kg, respectively. The concentration of As and Zn in sludge-T, Cd in sludge-D, Ni in sludge-H, Zn in sludge-S, and Cd in sludge-Y exceeded the soil contamination standards of Korea. The results from 2 separate kinds of leaching test, the Korea Standard Leaching Test(KSLT) and Toxicity Characteristic Leaching Procedure(TCLP), showed that all the sludges met the Korea groundwater standards. From the XRD and SEM-EDS analysis, the peaks of calcite and quartz were found in the sludges. The sludge also had a high proportion of Fe and O, and the majority of the composition was amorphous iron hydroxide.

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Leaching Characteristics of Heavy Metals in the Bottom Ash from Circulating Fluidized Bed Combustion, in Order for Application to Limestone Mine Backfilling

Cited by 4 publications

References 20 publications

Numerical evaluation of groundwater contaminant by backfilling in the abandoned mine

Numerical evaluation of groundwater contaminant by backfilling in the abandoned mine

Numerical Analysis of Modified Electrical Resistivity Survey for Filling Status of Mine Backfills

Evaluation of Characteristics of Sludge generated from Active Treatment System of Mine Drainage

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