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http://dx.doi.org/10.7857/JSGE.2016.21.3.006

Effect of Basic Oxygen Furnace Slag used as Structural Filling Materials on the Subsurface Environment  

Lee, Hosub (Department of Civil and Environmental Engineering, Seoul National University)
Nam, Taekwoo (Department of Civil and Environmental Engineering, Seoul National University)
Jho, Eun Hea (Department of Environmental Science, Hankuk University of Foreign Studies)
Nam, Kyoungphile (Department of Civil and Environmental Engineering, Seoul National University)
Publication Information
Journal of Soil and Groundwater Environment / v.21, no.3, 2016 , pp. 6-13 More about this Journal
Abstract
The effect of blast oxygen furnace (BOF) slag used as filling materials on the soil environment was studied using column tests that simulated the flow of the BOF slag leachate through the soil layer. The Cu, Mn, Zn, Ni, and F contents of the leachate affected soil were similar to that of the controls (i.e., soils that were not affected by the leachate). The As, Cd, and Pb contents were lower in the leachate affected soils than the controls. The changes in these contaminants contents can be attributed to the interactions between anions such as alkalinity generating anions (e.g., CO32−, HCO3−, OH−) or calcium ions with heavy metals or F, which consequently affected the fate of heavy metals and F in the leachate affected soils. The germination and growth of Spinapis alba in the soils affected by the leachate and the controls were also similar. However, the proportion of alkalophilic bacteria in the soils affected by the leachate significantly increased, and this can be explained by the increased soil pH due to the alkaline leachate. Overall, this study shows that the alkalinity of the BOF slag leachate, rather than the presence of heavy metals and F in the leachate, needs to be considered when the BOF slag is to be reused as structural filling materials.
Keywords
Basic oxygen furnace (BOF) slag; Structural filling material; Leaching; BOF slag leachate; Toxicity;
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