超声波/类Fenton氧化处理六氯苯污染土壤淋洗液的研究

Treatment of Hexachlorobenzene-contaminated Soil Leacheate by Ultrasonic and Fenton-like Oxidation

以六氯苯污染土壤淋洗液为对象,研究了超声波和类Fenton氧化对淋洗液的处理效果及影响因素。结果表明,超声波和类Fenton氧化联合处理淋洗液的处理效果好于超声波或类Fenton氧化法单独处理时的效果。利用超声波和类Fenton氧化联合处理淋洗液时,Fe(NO_3)_3浓度、H_2O_2浓度、淋洗液p H、超声功率和超声时间均对处理效果具有一定的影响,其最佳处理条件为:Fe(NO_3)_3浓度为20 mmol/L,H_2O_2浓度为200 mmol/L,淋洗液p H为4.0~6.0,超声功率为250 W,超声处理时间为40 min,该条件下土壤淋洗液中COD和六氯苯的去除率均在80%以上,水质得到大幅度改善。该结果表明将超声波与类Fenton氧化联合应用于六氯苯污染土壤淋洗液的处理具有一定的可行性。

Hexachlorobenzene-contaminated solid leacheate was used as the object to research the leacheate treatment effect by ultrasonic and Fenton-like oxidation and its influence factors. The results showed that, the hybrid technology of ultrasound and Fenton-like oxidation had a better leacheate treatment efficiency than ultrasound and Fenton-like oxidation treated separately. The mass concentration of Fe（NO3）3 and H2O2, pH value of leacheate, ultrasonic power and ultrasonic time impacted on the treatment efficiency of leacheate. The optimal treatment conditions were as follows, the mass concentration of Fe （NO3）3 and H2O2 was 20 mmol/L and 200 mmol/L respectively, pH value was 4.0-6.0, ultrasonic power was 250 W and ultrasonic time was 40 min. Under these conditions, the removal rate of hexachlorobenzene and COD was over 80% by hybrid technology of ultrasonic and Fenton-like oxidation, which dramatically improved the water quality. The results indicated that the hybrid technology of ultrasonic and Fenton-like oxidation could apply to hexachlorobenzene-contaminated solid leacheate treatment.