Removal of As and Heavy Metals (Cd, Cu, Pb) in Soil Washed Fine Soil Using Enhanced Electrochemistry

The soil washing is broadly used by treating amount of soil for a short period. However, soil washing has 2 kinds of disadvantage that the efficiency is very low in fine soil with low permeability, and highly concentrated fine soil after the process has to designate and dispose as the hazardous waste. Thus, treatment of fine soil contaminated arsenic and heavy metals after soil washing is focused in this study, and electrokinetic remediation as known as having high efficiency in soil with low permeability is selected. Moreover, chelating agents which could be changed from fraction to remove difficult to treatable fraction are applied to enhance the effect of electrokinetic remediation. The condition of chelating agent was selected to 50 mM Na_2EDTA adjusted pH 12 through the batch tests. In the result of operating units, the experiment which not only controlled the pumping velocity for preventing extremely acidic pH around anode, but also impregnated fine soil with 50 mM Na_2EDTA adjusted pH 12 is the most effective removal rate as arsenic, cadmium, copper and lead are 73.68%, 13.18%, 38.41% and 33.23% respectively.

並列關鍵字

arsenic ； heavy metal ； electrokinetic ； chelating agent ； soil washing

國際替代計量

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