高锰酸钾氧化去除砂壤土中三氯乙烯的试验研究

Efficiency of trichloroethylene removal from the contaminated soil using potassium permanganate.

以环境中常见的污染物三氯乙烯(TCE)为研究对象,利用高锰酸钾(KMnO4)对工业场地土壤中的TCE进行处理,探讨了不同氧化条件、污染物初始浓度、氧化次数等对去除效果的影响.结果表明,采用正交试验获得优化操作条件为:KMnO4浓度125mg/L,pH7,反应时间30min.在此条件下,100mg/kg的TCE去除率达到93.7%.TCE的去除率随污染物浓度的增加而减小,对于污染程度高的土壤,2次处理能有效提高去除率.土柱实验结果表明经过KMnO4溶液淋洗12d后,初始浓度为50mg/kg的TCE氧化率均达到88.1%以上,降低淋洗流速可提高TCE的去除率.

Potassium permanganate（KMnO4） oxidation of trichloroethylene（TCE） in soil slurry system was investigated on effects of KMnO4 cocentration,pH,reaction time,initial TCE concentration and treatment times.Through the orthogonal test,the optimal operation condition of oxidation was determined to be KMnO4 concentration 125mg/L,pH value of 7.0,reaction time 30min,resulting in 100mg/kg TCE degradation reaching 93.7%.The removal rate of TCE was decreased with increased initial TCE concentration.Second treatments significantly enhanced contaminant removal,particularly in high-level TCE contaminated soils.Results from soil column experiments showed that TCE with initial concentration of 50mg/kg could be oxidized by KMnO4 at 88.1% removal rate after 12 days.