MOE Key Laboratory of Regional Energy Systems Optimization, S&C Academy of Energy and Environmental Research, North China Electric Power University, Beijing, 102206, China.
Environ Sci Pollut Res Int. 2014 Sep;21(17):10536-49. doi: 10.1007/s11356-014-2958-9. Epub 2014 May 8.
This study systematically investigated the interactive effects of dissolved organic matter (DOM) and biosurfactant (rhamnolipid) on the biodegradation of phenanthrene (PHE) and pyrene (PYR) in soil-water systems. The degradations of two polycyclic aromatic hydrocarbons (PAHs) were fitted well with first order kinetic model and the degradation rates were in proportion to the concentration of biosurfactant. In addition, the degradation enhancement of PHE was higher than that of PYR. The addition of soil DOM itself at an environmental level would inhibit the biodegradation of PAHs. However, in the system with co-existence of DOM and biosurfactant, the degradation of PAHs was higher than that in only biosurfactant addition system, which may be attributed to the formation of DOM-biosurfactant complex micelles. Furthermore, under the combined conditions, the degradation of PAH increased with the biosurfactant concentration, and the soil DOM added system showed slightly higher degradation than the compost DOM added system, indicating that the chemical structure and composition of DOM would also affect the bioavailability of PAHs. The study result may broaden knowledge of biosurfactant enhanced bioremediation of PAHs contaminated soil and groundwater.
本研究系统地研究了溶解有机质（DOM）和生物表面活性剂（鼠李糖脂）对土壤-水系统中菲（PHE）和芘（PYR）生物降解的交互作用。两种多环芳烃（PAHs）的降解均符合一级动力学模型，降解速率与生物表面活性剂的浓度成正比。此外，PHE 的降解增强高于 PYR。在环境水平下添加土壤 DOM 本身会抑制 PAHs 的生物降解。然而，在共存 DOM 和生物表面活性剂的系统中，PAHs 的降解高于仅添加生物表面活性剂的系统，这可能归因于 DOM-生物表面活性剂复合胶束的形成。此外，在联合条件下，随着生物表面活性剂浓度的增加，PAH 的降解增加，添加土壤 DOM 的系统显示出比添加堆肥 DOM 的系统稍高的降解，表明 DOM 的化学结构和组成也会影响 PAHs 的生物利用度。该研究结果可能拓宽了对受 PAHs 污染的土壤和地下水的生物表面活性剂增强生物修复的认识。
