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Outline
To investigate the enhanced effect of ferrihydrite-loaded electrodes on the degradation of organic pollutants in petroleum-contaminated soil using a Microbial Electrochemical System (MES), and to elucidate the underlying synergistic mechanisms, a single-chamber soil MES reactor was constructed. Using oil-contaminated soil as the experimental medium, we compared the performance of the original soil, the conventional electrode setup, and the ferrihydrite-loaded electrode setup. The system's effectiveness was evaluated through electrochemical analysis, assessment of soil carbon degradation and transformation, characterization of iron forms, and determination of enzyme activity. Results indicate that loading electrodes with ferrihydrite significantly improved the system's electrochemical performance, with cumulative charge output increasing by 18%. The carbon degradation capacity was also enhanced, with the total carbon degradation rate increasing by up to 11%, effectively promoting the transformation of recalcitrant carbon, such as humus, into more labile forms. Ferrihydrite facilitated the iron cycle, with iron ion content increasing by up to 28%, thereby enhancing the Fe(II)/Fe(III) redox cycling and strengthening the coupling between carbon and nitrogen transformations. Additionally, the bioelectric field accelerated the phase transformation of ferrihydrite into goethite and hematite. The presence of ferrihydrite stimulated microbial secretion of degradative enzymes, significantly increasing the activity of key enzymes involved in pollutant degradation. Mantel test results further reveal that dehydrogenase and polyphenol oxidase served as the primary drivers of carbon mineralization.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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