Effects of Factors on Degradation of Chlordane Contaminated Soil by Microwave

A batch experiment was carried out on remediation of chlordane contaminated soil by microwave, and factors affecting the remediation were studied. It was found that when the soil was 20% in moisture content, 8.5 in pH, and 50 g•kg^-1 in activated carbon amended, and 20 minutes of irradiation with 600 W microwave, the removal rate of the chlordane in the soil reached to 89%,and the effect could be significantly increased if the soil temperature was be maintained above 300 ℃ during the process. The experiment proved that the factors affecting chlordane removal rate followed the order of microwave power > irradiation time > activated carbon amendment rate > moisture content. Analysis of the soil solution shows that the degradation had some intermediates, such as chlordene, heptachlor and nonachlor, which suggests that there existed chlorination and dechlorination reactions in the process.