Laboratory Model Test for Heavy Metal-Contaminated Soil Remediation Using PVDs
- Eun Chul Shin (Incheon National University) | Sung Hwan Kim (Incheon National University) | Jeong Jun Park (Incheon National University)
- Document ID
- International Society of Offshore and Polar Engineers
- International Journal of Offshore and Polar Engineering
- Publication Date
- March 2016
- Document Type
- Journal Paper
- 65 - 71
- 2016. The International Society of Offshore and Polar Engineers
- cylindrical chamber, remedial efficiency, Laboratory model test, heavy metal, biodegradable PVDs
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The method for the remediation of contaminated ground should basically be determined according to in-situ conditions and the properties of the contaminants. Methods to remediate soils contaminated by heavy metals are classified into physiochemical treatment techniques (such as pump and treat, solidification and stabilization, and vitrification), phytoremediation techniques (such as land farming), and biological treatments. However, these techniques have disadvantages such as the long duration needed for remediation, high costs, and potential risk of secondary contamination from chemical agents applied, and in the case of the actual remediation of in-situ ground having lower hydraulic conductivity, the remedial efficiency may decline rapidly or even make it difficult to use a particular remedial approach. The transmission of fluids and extraction of contaminants from contaminated soils with high concentrations of heavy metals or harmful materials would be difficult, and the voids in soils of lower permeability, such as silt or clay, are typically very small, limiting the injection or extraction of surfactant or desorption agents. Thus, technical methods for the remediation of contaminated soils and construction techniques to perform the remediation of soils are required (Korean Ministry of Environment, 2009).
The adsorption capacity of Prefabricated Vertical Drains (PVDs) for contaminants was assessed by conducting adsorption experiments on reactive material coated on filters of the drains and by comparing the results of the experiments with the isotherm adsorption model. Regarding the remediation system with PVDs, the remedial efficiency was measured through cylindrical chamber experiments. The reactive material used in the experiments was a natural zeolite, and the contaminants were Cu, Pb, and Cd. The choice of three kinds of heavy metals was due to a contamination survey. Incheon was distributed in three heavy metal contaminated areas.
This study was conducted to determine basic data to be used for geotechnical remediation engineering by analyzing the characteristics of factors affecting the contaminated soils in the remediation process through the use of PVDs and by reviewing the removal effects obtained through laboratory experiments.
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