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• W3086284766 startingPage "110197" @default.
• W3086284766 abstract "Artificial redox mediators can be employed to improve the electron transfer efficiency during sludge methanogenesis, whereas these artificial redox mediators have possible deficiencies, such as high cost and non-biodegradability. For large-scale commercial applications, more cost-effective and environmentally friendly alternatives should be developed. Herein, the potential of extracellular polymeric substances (EPS) as natural redox mediators to improve methanogenesis was investigated. Compared to the control test without EPS addition, the methane (CH4) production yield was increased by 83.5 ± 2.4% with an EPS dosage of 0.50 g/L and the lag phase duration was shortened by 45.6 ± 7.0%, along with the enhanced sludge dewaterability. Spectroelectrochemical measurements implied that EPS addition notably changed the intensities of different redox-active groups, which decreased the charge transfer resistance and enhanced the extracellular electron transfer efficiency. These redox-active groups were mainly from the solubilization and hydrolysis of sludge protein due to increased protease activities, thereby leading to a higher acetate concentration during the acidification step. Further investigation showed that EPS addition also improved the activities of both acetotrophic and hydrogenotrophic methanogens, as indicated by a higher abundance of alpha subunit of methyl coenzyme M reductase (mcrA) genes, enhancing CH4 production. This work provides an innovative strategy for improving sludge anaerobic digestion with efficient additives." @default.
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• W3086284766 date "2020-12-01" @default.
• W3086284766 modified "2023-09-27" @default.
• W3086284766 title "Extracellular polymeric substances trigger an increase in redox mediators for enhanced sludge methanogenesis" @default.
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• W3086284766 doi "https://doi.org/10.1016/j.envres.2020.110197" @default.
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