泥浆系统中Fe2+活化过碳酸钠降解三氯乙烯

主要探究泥浆系统中Fe2+活化过碳酸钠(SPC)降解三氯乙烯(TCE)的效果。通过批次实验研究土壤对TCE的吸附作用,并考察泥浆系统中SPC和Fe2+投加量对TCE去除效果的影响。结果表明,土壤对TCE具有一定的吸附作用;泥浆系统中,土壤含有的有机质越多,TCE去除效果越低;当SPC/TCE摩尔比为5/1~20/1时,SPC投加量对TCE去除影响不明显,TCE去除效果随Fe2+投加量增大而提高。当水土质量比为30/1,TCE初始浓度为20 mg/L时,SPC/Fe2+/TCE最优摩尔比为10/30/1,此时TCE最终去除率达到97.5%。综上所述,Fe2+活化过碳酸钠降解三氯乙烯快速高效,为应用于实际场地修复提供有效的理论依据。

Degradation of trichloroethylene using sodium percarbonate activated by ferrous ion in slurry system

The performance of TCE degradation using sodium percarbonate (SPC) activated by ferrous ion in slurry system was investigated. Batch tests were applied to explore TCE adsorption on soil and the impacts of SPC and Fe2+ dosages on TCE removal. The results indicated that the soil, to some extent, had adsorption effect to TCE. TCE removal decreased with the increasing of organic matters in soil in slurry system. TCE degradation increased with the increasing of Fe2+ dosage, but SPC dosage had less effect in the tested SPC dosage range (SPC/TCE molar ratio of 5/1~20/1). The optimum molar ratio of SPC/Fe2+/TCE was indentified to be 10/30/1 when the water/soil mass ratio was 30/1 and the initial concentration of TCE was 20 mg/L, and the final TCE removal was 97.5%. The above results strongly confirmed that sodium percarbonate activated by ferrous ion in TCE degradation is fast and efficient in slurry system, and it provides a theoretical basis for practical application in TCE contaminated site remediation.