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- W4384207917 abstract "CO2 injection or biogas recirculation can affect the process of anaerobic digestion, but there is a lack of systematic study on the injection strategy in the continuously operated reactors. In this study, the performance of a continuous stirred anaerobic digester treating food waste were evaluated under different injection rates (RC1-1.32 L/L/d v.s. RC2-0.66 L/L/d) and different CO2 injection modes (pulsed feeding v.s. continuous feeding). Under the pulsed CO2 feeding mode, the methane yields of RC1 and RC2 were increased by 19.3% and 27.1%, respectively as compared to the control reactor, correspondingly 34.5% and 59.0% of injected CO2 was reduced. When transferred to continuous feeding CO2 mode, only 12.4% increment of methane yield was found in RC1 as compared to RB. The intermediate metabolites analyses indicated that CO2 enrichment reinforced acetic acid and lactic acid production pathway and weakened the propionic acid pathway, which is favorable for elevating methane yield. Microbial community analysis revealed that the relative abundance of hydrogenotrophic methanogens increased accompanied with some acidogenic consortia and CO2 fixation associating consortia. This work provides a new approach to promote methane generation from organic wastes with sequestered more CO2 thus contributing to a circular economy." @default.
- W4384207917 created "2023-07-14" @default.
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- W4384207917 date "2023-09-01" @default.
- W4384207917 modified "2023-09-27" @default.
- W4384207917 title "Pulsed CO2 feeding promotes methane yield in anaerobic digester by diverting acidogenic pathways" @default.
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- W4384207917 doi "https://doi.org/10.1016/j.cej.2023.144756" @default.
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