School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, 710055, Shaanxi, Xi'an, China; Key Laboratory of Northwest Water Resources, Environment and Ecology, MOE, China; Key Laboratory of Environmental Engineering, Shaanxi Province, China.
School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, 710055, Shaanxi, Xi'an, China; Key Laboratory of Northwest Water Resources, Environment and Ecology, MOE, China; Key Laboratory of Environmental Engineering, Shaanxi Province, China.
J Environ Manage. 2023 Sep 15;342:118291. doi: 10.1016/j.jenvman.2023.118291. Epub 2023 Jun 7.
In this study, a novel mild pre-oxidation mode was successfully explored by fabricating Fe-SOM prepared by adding 2.5% and 20% fulvic acid (FA). This study explored the mechanism of mild Fe-SOM pre-oxidation to stimulate rapid biological degradation of long-alkanes in oil-contaminated soils. Results showed that under mild Fe-SOM pre-oxidation, the total •OH intensity and bacterial killing degree（D） were low, and hydrocarbon conversion（C）was fast, resulting in rapid degradation of long-alkanes. Additionally, the fast group removed 1.7-fold more than slow group and biodegraded long-alkanes 182 days significantly faster. Furthermore, compared with slow group (8.26 log CFU/g), the fast group (51.48 log CFU/g) characterized much more bacteria. Besides, the fast group had higher C (5.72%-15.95%), thus increasing the degradation rate of long-alkanes (7.61%-18.86%). A shift in the microbial community was found after mild Fe-SOM pre-oxidation, with an average relative abundance of 18.6% for the dominant genus Bacillus. Therefore, the mild pre-oxidation reduced the D, and the high bacterial abundance promoted nutrients consumption and C, which shortened bioremediation period and increased the long-alkanes degradation rate. This study provided a promising novel mild Fenton pre-oxidation mode to rapid remediate heavily multicomponent oil-contaminated soils.
在本研究中，通过添加 2.5%和 20%腐植酸（FA）制备了 Fe-SOM，成功探索了一种新的温和预氧化模式。本研究探讨了温和 Fe-SOM 预氧化刺激油污染土壤中长链烷烃快速生物降解的机制。结果表明，在温和的 Fe-SOM 预氧化下，总•OH 强度和细菌杀灭程度（D）较低，烃类转化率（C）较快，导致长链烷烃快速降解。此外，快速组比慢速组多去除了 1.7 倍，生物降解长链烷烃的速度快了 182 天。此外，与慢速组（8.26 log CFU/g）相比，快速组（51.48 log CFU/g）具有更多的细菌。此外，快速组的 C（5.72%-15.95%）更高，从而提高了长链烷烃的降解速率（7.61%-18.86%）。温和的 Fe-SOM 预氧化后发现微生物群落发生了变化，优势属芽孢杆菌的平均相对丰度为 18.6%。因此，温和预氧化降低了 D，高细菌丰度促进了营养物质的消耗和 C，缩短了生物修复周期，提高了长链烷烃的降解速率。本研究提供了一种有前途的新型温和 Fenton 预氧化模式，可快速修复多组分重度污染土壤。
