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Outline
Traditional up-flow anaerobic sludge blanket (UASB) reactors face challenges such as system acidification, sludge washout, and inferior methanogenic performance during the treatment of actual waste incineration plant leachate. To address these issues, this study constructed a microbial electrolysis cell coupled with a UASB system (MEC-UASB) for treating leachate from waste incineration plants. After 145days of operation, the system demonstrated significantly enhanced performance under an applied voltage of 1V. The COD removal rate of the MEC-UASB effluent reached 80.6%, which was 21.0% higher than that of the UASB control. Moreover, following a sharp increase in COD loading, the attenuation of removal efficiency in the MEC-UASB system was 13.6% lower than that of the control, indicating markedly improved resistance to shock loads. Furthermore, the methane production efficiency of the MEC-UASB system was 1.53 times that of the control, reaching (0.23 ± 0.01) m3CH4/kg COD. Carbon emission accounting further revealed that the net carbon reduction of the MEC-UASB system reached 10.54kg CO2/m3, which was 21.9% higher than that of the UASB system. Based on analyses of microbial enzyme activity and community structure, the enhanced performance of the MEC-UASB system was primarily attributed to electrostimulation. This process promoted the enrichment of hydrogenotrophic methanogens, increased the secretion of extracellular polymeric substances (EPS), and enhanced electron transfer efficiency, thereby improving sludge retention and microbial activity. This study demonstrates that the MEC-UASB system resists shock loads robustly under high organic loading conditions, while achieving efficient pollutant removal, significant carbon emission reduction, and economic benefits for long-term stable operation.
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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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