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首页> 外文期刊>Environmental Science & Technology >Cyclodextrin Enhanced Biodegradation of Polycyclic Aromatic Hydrocarbons and Phenols in Contaminated Soil Slurries
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Cyclodextrin Enhanced Biodegradation of Polycyclic Aromatic Hydrocarbons and Phenols in Contaminated Soil Slurries

机译：环糊精增强土壤污泥中多环芳烃和酚类的生物降解

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摘要

This work aimed to evaluate the relative contribution of soil catabolic activity, contaminant bioaccessibility, and nutrient levels on the biodegradation of field-aged polycyclic aromatic hydrocarbons and phenolic compounds in three municipal gas plant site soils. Extents of biodegradation achieved, in 6 week-long soil slurry assays, under the following conditions were compared: (ⅰ) with inoculation of catabolically active PAH and phenol-degrading microorganisms, (ⅱ) with and without hydroxypropyl-β-cyclodextrin supplementation (HPCD; 100 g L~(-1)), and finally (ⅲ) with the provision of additional inorganic nutrients in combination with HPCD. Results indicated no significant (p < 0.05) differences between biodegradation endpoints attained in treatments inoculated with catabolically active microorganisms as compared with the uninoculated control. Amendments with HPCD significantly (p < 0.05) lowered biodegradation endpoints for most PAHs and phenolic compounds. Only in one soil did the combination of HPCD and nutrients consistently achieve better bioremediation endpoints with respect to the HPCD-only treatments. Thus, for most compounds, biodegradation was not limited by the catabolic activity of the indigenous microorganisms but rather by processes resulting in limited availability of contaminants to degraders. It is therefore suggested that the bioremediation of PAH and phenol impacted soils could be enhanced through HPCD amendments. In addition, the biodegradability of in situ and spiked (deuterated analogues) PAHs following 120 days aging of the soils suggested that this contact time was not sufficient to obtain similar partitions to that observed for field-aged contaminants; with the spiked compounds being significantly (p < 0.05) more available for biodegradation.
机译：这项工作旨在评估土壤分解代谢活性，污染物的生物可及性和养分水平对三种市政煤气厂场地土壤中田间老化的多环芳烃和酚类化合物生物降解的相对贡献。在长达6周的土壤淤浆测定中，在以下条件下进行了生物降解的程度进行了比较：（ⅰ）接种具有分解代谢活性的PAH和降解苯酚的微生物，（ⅱ）有和没有羟丙基-β-环糊精补充剂（HPCD） ； 100 g L〜（-1）），最后（ⅲ）与HPCD结合使用，添加其他无机养分。结果表明，与未接种对照相比，在接种分解代谢活性微生物的治疗中，达到的生物降解终点之间没有显着差异（p <0.05）。对于大多数多环芳烃和酚类化合物，用HPCD进行的修订显着降低（p <0.05）的生物降解终点。与仅使用HPCD的处理相比，仅在一种土壤中，HPCD和养分的组合始终能够达到更好的生物修复终点。因此，对于大多数化合物而言，生物降解不受本地微生物的分解代谢活性的限制，而是受到导致降解物可利用的污染物有限的过程的限制。因此，建议通过HPCD修正案可以增强PAH和苯酚影响的土壤的生物修复。此外，在土壤老化120天后，原位和加标（氘代类似物）PAHs的生物降解能力表明，这种接触时间不足以获得与田间老化污染物相似的分区。掺入的化合物显着（p <0.05）可用于生物降解。

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