|
KMID : 1024520060150030279
|
|
Journal of the Environmental Sciences
2006 Volume.15 No. 3 p.279 ~ p.286
|
|
|
Removal Characteristics of Arsenic from Abandoned Metal Mining Tailings by Electrokinetic Technique
|
|
Shin Hyun-Moo
Yoon Sam-Seok
|
|
|
Abstract
|
|
|
|
Electrokinetic technique was considered in removing arsenic from the abandoned mining tails. In order to estimate the removal characteristics of arsenic, the sequential extraction analysis and desorption experiment were carried out prior to the application of electrokientic process. The result of sequential extraction analysis indicated that the water soluble and exchangeable fraction, easily leachable to ground water, were very low as much as about 2.5% and the fraction except residual (38.3%), possibly extractable under very acidic or alkalic environment, was about 59%. In the result of desorption test using four different kinds of electrolytes, the mixture of citric acid and sodium dodecyl sulfate (SDS) showed the highest desorption efficiency as much as 77.3%. The removal efficiencies of arsenic from mining tailings by electrokinetic process under the different electrolyte environments were slightly low and resulted in the following order: citric acid + SDS (18.6%) > 0.1 (8.1%) > HAc (7.4%) > Distilled water(6.6%). Also, arsenic in soil matrix was moved favorably in the direction of anodic rather than cathodic region, which is opposite trend with cationic metal ions generally existing in soil, because anionic form of arsenic is dominated in acidic soil caused by the movement of acid front form anode.
|
|
|
KEYWORD
|
|
|
Electrokinetic remediation, Arsenic-contaminated soil, Metal mining
|
|
|
FullTexts / Linksout information
|
|
|
|
|
|
Listed journal information
|
|
|