Achieve clean and efficient biomethane production by matching between digestate recirculation and straw-to-manure feeding ratios

Abstract

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Mass Transfer Enhancement in High-Solids Anaerobic Digestion of Organic Fraction of Municipal Solid Wastes: A Review

“…During the recirculation process, soluble organic compounds undergo partial transfer from the solid phase to the liquid phase, thereby mitigating the substantial resistance encountered by mass transfer and gas diffusion within the solid phase [ 109 , 110 ]. Liquid digestate recirculation is also used to dilute the inhibitory effect of accumulated ammonia, VFAs, and other metabolites in liquid digestate, further enhancing the mass transfer in HS-AD between the inoculum and substrate [ 101 ].…”

Links between Process Performance and Microbial Community of Pennisetum Hybrid Co-Digested with Municipal Solid Waste

“…In addition, the microbial communities during the anaerobic digestion corresponded to the operation conditions, such as bioreactor type, pretreatments technology, feeding ratios, and digestate recirculation [22][23][24] A shift of dominant phylum from Firmicutes to Bacteroidetes occurred with the pretreated methods being changed from protease to carbohydrase-pretreated for anaerobic digestion of microalgae [25]. Similarly, a change in the dominated methanogens from Methanosaeta to Methanosarcina and Methanosphaera was observed in the co-digestion system of straw and manure with operation conditions varying from well-run to inhibited conditions [26]. Therefore, the effect of the operating status on the performance of anaerobic digestion and the link with microbial communities must be further studied.…”

Effects of slurry reflux on the stability and microbial community structure of corn stalk anaerobic digestion system

“…Slurry re ux was therefore an e cient and inexpensive way to reduce emissions from the anaerobic digestion system, which in turn, can effectively reduce the slurry discharge and the subsequent disposal cost (Wu et al, 2018). Compared with an AD system where animal manure was used as the substrate, an anaerobic digestion system with crop stalk as the primary substrate lacks nutrients and buffering capacity (Zheng et al, 2020). Through slurry re ux, the basicity of the slurry could be used to balance the acidity of the digestion liquid, to maintain the pH value within an appropriate range.…”