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Bioresource Technology
Volume 329, 2021, 124871

Carbon-based conductive materials accelerated methane production in anaerobic digestion of waste fat, oil and grease

Xia Hea, Zhenyu Guooa, Jian Lub,c, Ping Zhanga

College of Environmental Science and Engineering, Guilin University of Technology, Guangxi 541006, China.


Little is known about the effect of carbon-based conductive material (CM) addition on the anaerobic co-digestion of fat, oil and grease (FOG) and waste activated sludge (WAS). In this study, three types of carbon-based CMs (nano-graphite (NG), granular activated carbon (GAC), and carbon cloth (CC)) and nine dosages were evaluated for their influences on co-digestion performance. The best dosage was achieved at 0.2 g/L NG, 10 g/L GAC, and 1 cm × 5 cm CC with 13–22% incremental methane production, 25–55% increased VS removal and 28–32% enhanced COD conversion efficiency compared to the control. The highest total amount of bacteria/archaea was found in CC (1 cm × 5 cm), followed by GAC at 10 g/L and NG at 0.2 g/L, which were all higher than those of the control. Microbial community analysis revealed that direct interspecies electron transfer (DIET)-mediated syntrophic acetate oxidation (SAO) enabling faster acetate conversion might be responsible for the enhancement of methane production.

Keywords: Anaerobic digestion, Conductive materials, GreaseSludge, Direct interspecies electron transfer.

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