Research Advances in Biological Carbon Fixation Technology and Pathways in Anaerobic Digestion Process
Anaerobic digestion(AD)is an effective method for reducing organic waste and producing clean energy.In context of global warming and scarcity of fossil fuels,integrating AD with microbial carbon sequestration enhances biomethane yield and carbon fixation capacity.However,current research on microbial carbon sequestration often overlooks the carbon fixation potential of AD systems.Based on the current status of CO2 biotransformation in anaerobic digestion,this paper introduces the pathways of CO2 generation and fixation in anaerobic digestion.It focuses on the research progress achieved by introducing external H2,adding zero-valent iron,utilizing microbial electrolysis cells,adding conductive materials,and introducing external CO2 to optimize the AD process.Finally,this paper looks forward to future research directions,including the fixation of CO2 into amorphous carbon,elucidating the mechanisms by which external CO2 enhances methanogenesis,and advancing related technologies from laboratory to industrial application.This serves as a reference for exploring carbon sequestration pathways in anaerobic digestion and improving CO2 fixation and conversion technologies.
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