电动修复硝酸盐污染高岭土的影响因素

摘要

用电动修复方法对硝酸盐污染高岭土进行修复试验研究，试验所用硝酸盐污染高岭土中氮的初始浓度为1000 mg/kg，研究了pH、修复时间、修复电压对硝酸盐氮去除率的影响。结果表明，硝酸盐氮的去除率随修复时间延长和修复电压增大而升高；延长修复时间电能消耗呈增加趋势，增大修复电压电能消耗也会增加；综合考虑去除率和能耗2种因素，对于试验所研究的硝酸盐污染高岭土最佳修复时间是4 d，最佳修复电压为0.7～1.0 V/cm。当修复电压为1.0 V/cm，修复时间为4 d时，土壤硝酸盐氮的去除率为87.67％，电能消耗为335.2 kW· h/g。%The experimental study was conducted on electrokinetic remediation for nitrate-polluted kaolin .The effects of pH, operating time and applied voltage on removal efficiency were mainly studied . The initial concentration of nitrate nitrogen in kaolin was 1 000 mg/kg.The results show that the removal efficiency can be improved with the increase of operating time and applied current .The electric energy consumption will increase as the operating time and applied current increase .Comprehensively considering the removal efficiencies and electric energy consumptions , the optimal operating time and applied voltage for the studied soils are 4 days and 0 .7-1 .0 V/cm respectively.When the operating time and applied voltage are 4 days and 1.0 V/cm respectively, the soil nitrate nitrogen removal rate is 87.67%and the power consumption is 335.2 kW· h/g.