Evaluation of chemical pretreatment of contaminated soil for improved PAH bioremediation
Evaluation of chemical pretreatment of contaminated soil for improved PAH bioremediation
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DOI：
10.1007/s00253-004-1679-2
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发表时间：
2004-10-01
影响因子：
5
通讯作者：
Itävaara, M
中科院分区：
文献类型：
--
作者：
Piskonen, R;Itävaara, M
通过分析 C-14 标记的菲、芘和苯并(a)芘的矿化，评估了几种化学处理作为污染土壤中多环芳烃 (PAH) 生物降解潜在促进剂的效率。在微量滴定板测定中评估了非离子表面活性剂对芬顿氧化的作用以及表面活性剂组合对芬顿氧化的作用。本研究选择的表面活性剂为 Tween 80、Brij 35、Tergitol NP-10 和 Triton X-100。添加芬顿试剂显着增强了所研究的两个浓度下芘的矿化：2.8 M H2O2 与 0.1 M FeSO4 以及 0.7 M H2O2 与 0.025 M FeSO4。芬顿处理也积极诱导菲矿化。然而，没有一种处理对苯并（a）芘矿化具有显着影响。添加浓度为水临界胶束浓度 20% 和 80% 的表面活性剂不会显着影响矿化速率。当添加表面活性剂与芬顿氧化相结合时，与单独芬顿处理后的矿化率相比，矿化率降低。结果表明，Fenton试剂的添加可以增强污染土壤中PAHs的矿化，而表面活性剂的添加没有显着的有益效果。当表面活性剂与芬顿试剂同时添加到受污染的土壤中时，芬顿氧化的效率可能会降低。
The efficiency of several chemical treatments as potential enhancers of the biodegradation of polycyclic aromatic hydrocarbons (PAHs) in contaminated soil was evaluated by analyzing the mineralization of C-14-labeled phenanthrene, pyrene, and benzo(a)pyrene. The effect of nonionic surfactants with Fenton oxidation and combinations of surfactants with the Fenton oxidation was evaluated in a microtiter plate assay. The surfactants selected for the study were Tween 80, Brij 35, Tergitol NP-10, and Triton X-100. The addition of Fenton's reagent significantly enhanced the mineralization of pyrene at the two concentrations studied: 2.8 M H2O2 with 0.1 M FeSO4 and 0.7 M H2O2 with 0.025 M FeSO4. Phenanthrene mineralization was also positively induced by the Fenton treatments. However, none of the treatments had a significant effect on benzo(a)pyrene mineralization. Surfactant additions at concentrations of 20% and 80% of the aqueous critical micelle concentration did not significantly affect the mineralization rates. When surfactant addition was combined with the Fenton oxidation, reduced mineralization rates were obtained when compared with mineralization after Fenton's treatment alone. The results indicate that the addition of Fenton's reagent may enhance the mineralization of PAHs in contaminated soil, whereas the addition of surfactants has no significant beneficial effect. The efficiency of the Fenton oxidation may decrease when surfactants are added simultaneously with Fenton's reagent to contaminated soil.