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논문 기본 정보

자료유형
학술대회자료
저자정보
Park, Joon-Hong (School of Civil and Environment Engineering, Yonsei University) Kim, Hee-Joung (Department of Environmental Sciences, Kangwon National University) Yang, Jae-E. (Department of Environmental Sciences, Kangwon National University) Ok, Yong-Sik (Division of Biological Environment, Kangwon National University) Lee, Jai-Young (Department of Environment Engineering, University of Seoul) Jun, Sang-Ho (Department of Environmental Sciences, Kangwon National University)
저널정보
한국지하수토양환경학회 한국지하수토양환경학회 심포지엄 한국지하수토양환경학회 2005년도 INTERNATIONAL SYMPOSIUM ON SOIL & GROUNDWATER ENVIRONMENT
발행연도
2005.1
수록면
59 - 61 (3page)

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In Korea, hundreds of abandoned and closed coal and metallic mines are present in the steep mountain valleys due to the depression of the mining industry since the late 1980s. From these mines, enormous amounts of coal waste were dumped on the slopes, which causes sedimentation and acid mine drainage (AMD) to be discharged directly into streams causing detrimental effects on soil and water environments. A limestone slurry by-product (lime cake) is produced from the Solvay process in manufacturing soda ash. It has very fine particles, low hydraulic conductivities ($10^{-8}{\sim}10^{-9}cm/sec$), high pH, high EC due to the presence of CaO, MgO and $CaCl_2$ as major components, and traces of heavy metals. Due to these properties, it has potential to be used as a neutralizer for acid-producing materials. A field plot experiment was used to test the application of lime cake for reclaiming coal wastes. Each plot was 20 x 5 m (L x W) in size on a 56% slope. Treatments included a control (waste only), calcite ($CaCO_3$), and lime cake. The lime requirement (LR) for the coal waste to pH 7.0 was determined and treatments consisted of adding 100%, 50%, and 25% of the LR. The lime cake and calcite were also applied in either a layer between the coal waste and topsoil or mixed into the topsoil and coal waste. Each plot was hydroseeded with grasses and planted with trees. In each plot, surface runoff and subsurface water were collected. The lime cake treatments increased the pH of coal waste from 3.5 to 6, and neutralized the pH of the runoff and leachate of the coal waste from 4.3 to 6.7.

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