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http://dx.doi.org/10.9713/kcer.2013.51.6.745

Soil Washing and Effluent Treatment for Contaminated Soil with Toxic Metals  

Yang, Jung-Seok (KIST Gangneung Institute)
Hwang, Jin-Min (Deparment of Chemistry & Advanced Materials, Gangneung-Wonju National University)
Baek, Kitae (Department of Environmental Engineering, Chonbuk National University)
Kwon, Man Jae (KIST Gangneung Institute)
Publication Information
Korean Chemical Engineering Research / v.51, no.6, 2013 , pp. 745-754 More about this Journal
Abstract
This study evaluated the optimal soil washing conditions for toxic metals considering the removal efficiency of toxic metals from contaminated soils as well as from soil washing effluents. In the contaminated soils, As was the major contaminant and extracted by sodium hydroxide solution better than by sulfuric acid. However, in the case of the treatment of soil washing effluents, sodium hydroxide was less effective extractant because soil organic matter extracted by sodium hydroxide prevented the solid-liquid phase separation and toxic metal removal. In the treatment of soil washing effluents with sulfuric acid, toxic metals in the effluents were mostly precipitated at the pH above 6.5. In addition, granular ferric oxide (GFO) as an adsorbent enhanced the removal of As and Pb indicating that toxic metals in the washing effluents can be removed almost completely by the use of combined adsorption-neutralization process. This study suggests that soil washing techniques for toxic metals should be optimized based on the physical and chemical properties of the contaminated soils, the nature of chemical extractant, and the removal efficiency and effectiveness of toxic metals from the soils as well as soil washing effluents.
Keywords
Adsorption; Coagulation; Heavy Metals; Neutralization; Precipitation;
Citations & Related Records
Times Cited By KSCI : 13  (Citation Analysis)
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