Abstract
As soil or sludge contamination by PCBs has been an emergent issue in recent years, effective remediation technologies are strongly required. We have developed a combination process of thermal-desorption and steam-destruction applying to the PCB-contaminated soil remediation. In this method, pollutants are vaporized and removed by heating the contaminated soil in a thermal-desorption process, and the volatilized pollutants are destructed by reaction with H2O in steam-destruction process. Main points of our results are as follows;
•In thermal desorption, the performance of desorption depends on temperature. Changing the temperature from 200°C to 400°C made big improvement of the performance.
•In steam destruction, temperature was one of the dominant parameters to decide the ability, whereas steam concentration had little impact on the performance.
•PCB concentrations of outlets both from thermal-desorption process and steam-destruction process were approximately in the same levels, as the results of various scales of experiments.
