低污染浓度重金属Cd污染土壤的电动修复研究  

Research on Low Pollution Concentrations of Cd Soil Contamination by Electrokinetic Remediation

作　　者：徐磊[1] 刘国[1] 许文来[1] 

机构地区：[1]成都理工大学地质灾害防治与地质环境保护国家重点实验室,成都610059

出　　处：《工业安全与环保》2015年第3期4-6,72,共4页Industrial Safety and Environmental Protection

基　　金：国家自然科学基金(41272266);高等学校博士学科点专项科研基金(20135122120020)

摘　　要：为了研究低污染浓度土壤重金属的电动修复规律,以自制156.27 mg/kg的重金属污染土壤为研究对象,运用经典公式计算确定通电时间、电场强度及电场力,运用1 V/cm和3 V/cm电压梯度的直流电加在电极两端,记录通电过程中的电流、pH值、电导率变化,用火焰原子吸收分光光度计测试土壤中Cd的浓度,计算去除率。1 V/cm去除率最高有9.5%,3 V/cm最高去除率有14.7%。电场强度越大,产生的电场力越大,去除率越高;3 V/cm电压梯度,电渗流的作用大于电场力的作用;1 V/cm的电压梯度,电场力的作用大于电渗流的作用。土壤pH值突变快,在1 V/cm和3 V/cm电压梯度下,低污染浓度土壤的电动修复效率较低。In order to study the electrokinetic remediation laws of low pollution concentration of soil heavy metal,a homemade 156. 27 mg/kg heavy metal contaminated soil is prepared as the research object,the classic formula calculation is conducted to determine the current time,field strength and electric field force,in which 1 v/cm and 3 v/cm of dc voltage gradient is applied in both ends of the electrode to record the current changes in the process of electricity. When pH changes,conductivity changes. The flame atomic absorption spectrophotometer is used to test the concentration of Cd in soil and calculate the removal rate. The highest removal rate can reach 9. 5% when in 1 v/cm and that can reach 14. 7% when in 3 v/cm。The greater the electric field intensity,the greater the electric field force produced and the higher the removal rate. When in 3v/cm voltage gradient,the effect of electric seepage is greater than that of electric field force; but when in 1 v/cm voltage gradient,the effect of electric field force is greater than that of the electric seepage. Soil pH mutations is fast and the electrokinetic remediation effect of low pollution concentration of soil is low when in 1 v/cm and 3 v/cm voltage gradient.

关 键 词：低浓度 污染土壤 重金属 电动修复 

分 类 号：X53[环境科学与工程—环境工程]