【摘要】 以农药生产企业搬迁遗留场地土壤为研究对象,研究了微波修复土壤技术的各影响因素对氯丹降解的影响。结果表明:在土壤含水率20%、pH值8.5、活性炭投加量50 g.kg-1、微波功率600 W和辐照时间20 min条件下,微波法对氯丹去除率达到89%;若土壤中氯丹去除温度保持在300℃以上,可使氯丹大幅度去除。各因素对微波法去除氯丹的影响由大到小依次为微波功率、辐照时间、活性炭投加量和含水率。修复过程中氯丹降解的中间产物有六氯、七氯和九氯等,推测其降解过程存在加氯和脱氯反应。更多还原

【Abstract】 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,50 g·kg-1 in activated carbon amended,and 20 min 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 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 chlordane,heptachlor and nonachlor,which suggests that there existed chlorination and dechlorination reactions in the process.更多还原