表面活性剂复配淋洗处理多环芳烃污染土壤

异位土壤淋洗是一种具有广泛应用前景的修复技术。采用生物表面活性剂鼠李糖 脂与吐温-80对含荧蔥、花、苯并[b]荧蔥、苯并[k]荧蔥、苯并[a]茁5种多环芳怪污染土壤进行 淋洗,结果表明单独使用鼠李糖脂有利于对荧蔥、茁的淋洗,而吐温-80有利于对苯并荧蔥与苯并 茁的淋洗。将鼠李糖脂与吐温-80复配后,提高了稠环型多环芳姪的淋洗效果,且当吐温-80在 复配体系中的占比为90%时,淋洗效果最佳。24 h后淋洗达到平衡,对荧蔥和茁的单次淋洗率可 达到65%以上,对苯并荧蔥、苯并花等5环或5环以上的多环芳怪的淋洗率可达到36%以上。

Elution Treatment of Polycyclic Aromatic Hydrocarbon Contaminated Soil by Bio-nonionic Mixed Surfactant

Heterotopic elution is a soil restoration technology with broad application prospects. The bio-nonionic surfactant rhamnolipid and Tween-80, were used to elute contaminated soil containing five kinds of polycyclic aromatic hydrocarbons: pyrene, benzo [ b ] fluoranthene, benzo [ k ] fluoranthene, fluoranthene and benzo [ a ] pyrene. The results indicated that rhamnolipid alone was beneficial to the elution of fluoranthene and pyrene, while Tween-80 was beneficial to desorption of benzofluoranthene and benzopyrene. The elution effect of polycyclic aromatic hydrocarbons was improved by using rhamnolipid and Tween-80 mixture, and the best removal rate was obtained when the ratio of Tween-80 reached 90% . The elution reached equilibrium after 24 h. The removal rate of fluoranthene and pyrene by single elution was above 65% , and the removal rate of benzofluoranthene and benzopyrene was over 36% .