Fenton氧化处理爆炸物污染土壤的实验研究

Fenton treatment of 2,4-and 2,6-dinitrotoluene in soil contaminated with explosive compounds

采用摇瓶和玻璃柱试验考察了Fenton氧化处理爆炸物污染土壤中2,4-DNT、2,6-DNT以及COD等的去除效果及其最佳参数.当3%H2O2投加量达到26.46mmol、FeSO4和H2O2的物质的量之比约为1:73.56时,2,4-DNT和2,6-DNT均可被完全氧化,COD去除率可达到87%.对于2,4-DNT和2,6-DNT,反应时间只需要2h,但要同时去除其它芳香族硝基化合物,则反应时间需要超过8h.土壤直接Fenton氧化的效果并不理想,而对洗出液进行Fenton氧化可以取得很好的效果.通过反应动力学分析和丙酮抑制试验得出,2,4-DNT比2,6-DNT容易氧化.GC-MS分析结果表明,不仅土壤中的2,4-DNT、2,6-DNT可被氧化,其它的硝基芳香族有机化合物也可被氧化去除.

The performance and technical parameters of Fenton treatment of 2,4- and 2,6-dinitrotoluene（DNT） in soil contaminated with explosive compounds has been investigated at laboratory scale. The experimental results showed that 2,4- and 2,6-DNT were removed completely in two hours while 87% of COD was removed in eight hours. The optimal H2O2 concentration was 26.46mmol, corresponding to a FeSO4 ： H2O2 mole ratio of 1：36.78 ～ 73.56. Much better removal performance can be achieved by Fenton oxidation treatment of washing-out liquid than by direct oxidation of contaminated soil on a column. Based on kinetic analysis and acetone inhibition assays, it was concluded that Fenton oxidation of 2,4- DNT is easier than oxidation of 2,6-DNT. GC-MS analysis showed that not only 2,4-DNT and 2,6-DNT but also other nitroaromatic organic compounds were totally removed during Fenton oxidation treatment.