Enhanced anaerobic digestion performance of food waste by Fe-Mn MOF-derived carbon composite: Methane production, microbial response, and intrinsic mechanisms.
AI summary
75% confidenceThis MEC study investigates Anaerobic digestion, Food waste, MOF-derived carbon composite. The research focuses on system optimization and characterization.
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Abstract
This study investigated the effects of Fe-Mn MOF-derived carbon composite (Fe-Mn MDC) on anaerobic digestion (AD) performance of food waste (FW) and elucidated the underlying mechanisms. The methane yield increased to 457.44 ± 14.21 mL/g VS under 0.05 g/g TS Fe-Mn MDC addition, representing a 36.47 % increase compared to the control group. Metagenomics analysis indicated that Fe-Mn MDC altered the microbial community structure, enriched the abundance and mutualism of exoelectrogenic bacteria (Geobacter) and electroactive methanogenic microorganisms (Methanothrix) involved in direct interspecies electron transfer. The metabolic activity of hydrogenotrophic methanogens was enhanced under Fe-Mn MDC addition, and the content of dehydrogenase and coenzyme F420 was also stimulated, thereby accelerating substrate consumption and methane production. The physicochemical characterization results of Fe-Mn MDC demonstrated that it could act as an electron shuttle and facilitate proton transfer. Besides, AD system exhibited not only an increase in e-pili and c-type genes abundance, but also an enhanced representation of gene modules linked to the biosynthesis of V/A-type ATPases (M00159) and F-type (M00157), which further indicated that Fe-Mn MDC enhanced the proton-coupled electron transfer in AD system. These results provided potential applications in FW management and new insights into the mechanism of renewable energy recovery from AD.