| 초록 |
The contaminated soil near a refinery facility was treated to removeheavy metalsby using electrokinetic process. Electrokinetic process is one of soil remediation technologies in which contaminants are transported by electromigration, electroosmosis and electrophoresis under electric field. Target soil was contaminated with heavy metals due tosmelting works,especially with arsenic, for a long time. In the case of arsenic that was a main pollutant, itsinitial concentrationwas 50.65 mg/kg. Electrokinetic process was operated with 2V/cm and 4V/cm of voltage gradient. As a result, removal efficiencies of arsenic in 2V/cm, 4V/cmwas 28.91% and 31.17%, respectively. In this system, main removal mechanism of arsenicwas not electroosmosis but electromigration. After the experiment, the amounts of remained arsenicwere as high as ever. Therefore, furtherexperiments will be required to increase the removal efficiencyof arsenic such as addition of chelating agents or control of electrolyte pHand so on. |
