Fenton试剂氧化处理火炸药污染土壤淋洗液

Treatment of explosive contaminated soil eluent by Fenton reagent oxidation

采用Fenton试剂对火炸药污染土壤淋洗液进行氧化处理,研究了Fe SO4·7H2O投加量、H2O2投加量、初始pH、反应时间及温度对处理效果的影响,采用发光细菌发评价处理前后水样的急性毒性变化。结果表明,Fenton试剂氧化可有效去除火炸药污染土壤淋洗液的COD,当Fe SO4·7H2O投加量为8.0 g/L,H2O2投加量为64 m L/L,初始pH为3,反应时间120 min及反应温度30℃时,污染土壤淋洗液的COD由4 553.9 mg/L降至800.1 mg/L,COD去除率82.4%,COD的降解符合二级动力学模型。经Fenton氧化处理后,水样的急性毒性降低94.7%,B/C由0.007升至0.22,可生化性得到明显改善。

The explosive contaminated soil was treated by Fenton reagent oxidation. The effects of Fe SO4·7H2O and H2O2 dosage,initial pH,reaction time and temperature on treatment efficiency were investigated. The change of acute toxicity of eluent was evaluated by bioluminescence assays. The results showed that Fenton reagent oxidation could effectively remove COD from the explosive contaminated soil eluent and improve biodegradability of the eluent. Under the conditions of Fe SO4·7H2O dosage of 8. 0 g/L,H2O2 dosage of 64 m L/L,initial pH 3,reaction time of 120 min and temperature of 30℃,COD decreased from 4 553. 9 mg/L to 800. 1 mg/L,with the removal efficiency of 82. 4%. The degradation process of COD obeyed second order kinetic model. After treatment by Fenton oxidation,the acute toxicity of eluent was reduced by 94. 7%,and B/C increased from0. 007 to 0. 22,indicating that its biodegradability was obviously improved.