电动修复对Cd污染土壤肥力的影响  

Enhancement of Soil Fertility by Electrokinetic Remediation of Calcareous Soil Spiked with Cadmium

作　　者：句炳新[1] 申哲民[1] 吴旦[1] 陈学军[1] 王文华[1] 

机构地区：[1]上海交通大学环境科学与工程学院,上海200240

出　　处：《农业环境科学学报》2006年第2期340-344,共5页Journal of Agro-Environment Science

基　　金：国家自然科学基金资助项目(20377028)

摘　　要：以上海潮土为对象,研究了电动力学(1V·cm-1)对土壤肥力的影响。修复前后测量的指标有土壤有机质(SOM)、pH、电导率(EC)、氧化还原电位(ORP)、有效N、速效P、速效K。结果表明,Cd浓度约为100mg·kg-1的模拟污染土壤经电动力学处理60h后,Cd的平均去除效率为68%。土壤中有效N、速效P和速效K分别平均提高为原来的1.45、4.25和3.29倍,同时TOC增加了3.96%。总之,电动力学修复后,土壤的肥力有了明显提升,表明电动力学在有效去除土壤中Cd的同时还能提升土壤的肥力,是一种可行的土壤修复技术。There is growing interest in the potential of applying an electric field to soil in order to move and stimulate the degradation of contaminants, but there is little knowledge concerning impacts of the method on soil fertility. The effects of electrokinetics （1V·cm^-1） on soil fertility was studied. Soil organic matter （SOM）, pH, electrical conductivity （EC）, oxidation reduction potential （ORP）, available nitrogen （N）, available phosphorus （P）, available potassium （K） were monitored before and after remediation. After 60 h of electrokinetic remediation, pH and EC increased gradually from anode to cathode, but ORP decreased gradually from anode to cathode. Meanwhile, cadmium （Cd） concentration in Cd-spiked soil was about 100 mg·kg^-1, indicating that the mean removal of 68%. Available N, P and K values in the soil increased to 1.45, 4.25, and 3.29 times of initial in average, respectively, and TOC also increased by 3.96 percent. Overall, there was an observed increase in soil fertility after EK remcdiation. The results of this study provided evidence that the application of electrokinetics can remove the cadmium in Cd-spiked soil efficiently, and in the mean time, enhance the fertility of the soil, thus endorsing its validity as a viable soil remediation technology.

关 键 词：CD污染 电动力学修复 土壤肥力 有效氮 速效磷 速效钾 有机质 

分 类 号：X53[环境科学与工程—环境工程]