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Assessment of Environmental Contamination caused by the Stone-dust using Leaching Tests  

Kang, Min-Ju (Department of Earth and Environmental Sciences, Chungbuk National University)
Lee, Pyeong-Koo (Geologic Environment Division, Korea Institute of Geoscience and Mineral Resources)
Youm, Seung-Jun (Geologic Environment Division, Korea Institute of Geoscience and Mineral Resources)
Publication Information
Journal of Soil and Groundwater Environment / v.15, no.3, 2010 , pp. 52-60 More about this Journal
Abstract
The stone-dust is an unavoidable by-product of aggregate production, which is produced about 0.8~1.0 million $m^3$ annually. The stone-dust is currently regarded as a hazard material on environment because it is classified as an industrial waste in the Waste Management Law of Korea. At present, the stone-dust is considered as a environmentally hazardous material, and is classified as an industrial waste according to the Waste Management Law of Korea. In this study, we assessed the heavy-metal contamination of the stone-dust on surrounding environments by various leaching tests. Leaching experiments (such as Korea Standard Leaching Procedure (KSLP), Soil Environment Preservation Act of Korea (SEPAK), Toxicity Characteristic Leaching Procedure (TCLP), and Synthetic Precipitation Leaching Procedure (SPLP)) show that very low heavy metals (As, Cd, Cu, Pb, Zn, Hg) and CN are leached out, or much less than each regulatory thresholds. The resuts of the leaching test with time in acidic solution (initial pH 5 and 3) indicate that pH-buffering minerals are present in the stone-dust. These results suggest that the stone-dust can not potentially affect adverse impact on surrounding environments such as surface water, groundwater and soil etc..
Keywords
Stone-dust; Aggregate; Leaching test; Heavy-metal; Assessment;
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  • Reference
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