陰極槽のpHを中性に保持した下での動電学的手法による土壌からのカドミウムの浄化

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Restoration of contaminated soils to an environmentally acceptable condition is important. Various methods currently used have advantages and limitations in remediating contaminants in soils. In fact, most successful in-situ remediation technologies are restricted to soils with relatively high hydraulic conductivity so that they can not be used for fine-grained deposits. One of the newer techniques in soil remediation is a method based on electrokinetic phenomena in soils. Electrokinetic soil remediation is an effective in-situ separation and removal technique used for extraction of heavy metals and some organic compounds from fine-grained soils. The technology uses electricity to affect chemical concentrations and water flow through the pores of soils.In the present study, the distributions of cadmium in the electrokinetic processing of kaolinite under the condition of constant applied voltage and pH of cathode reservoir kept at neutrality are predicted using a theoretical model that incorporates equilibrium chemistry and the results are compared with experimental findings. The results obtained in this study are summarized as follows:The pH was reduced to the strong acidity throughout most of the soil with an increase in the processing time. Cadmium migrates toward the cathode without accumulation of cadmium near the cathode and is successfully removed at the cathode reservoir. From experiments, it was also found that the progress of electrokinetic processing of cadmium could be grasped to a certain extent by monitoring the local voltage and the current density.
社団法人資源・素材学会の論文
2001-02-25

陰極槽のpHを中性に保持した下での動電学的手法による土壌からのカドミウムの浄化

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