Use of micro-bubbles has beneficial effects on the methanogenesis phase of Anaerobic Digestion. Using pure carbon dioxide, microbubbles linger in the reactor due to their small size (20 micron) providing a reservoir of CO2 to facilitate efficient conversion. The microbubbles also strip methane from the liquid so shifting the equilibrium towards completion. Use of pure CO2 microbubbles has produced over 100% increase in methane production over other techniques. The open access journal article below reports on this lab-bench scale study:
The journal article speculated that it was the fraction of microbubbles less 100 microns in size that is responsible for the acceleration of biogas production. Logically, seeding nearly all of the microbubbles around ~20 microns in size would give much greater acceleration. In an InnovateUK Energy Catalyst Feasibility Grant, Perlemax and the University of Sheffield tested this hypothesis, as well as upscaled to large lab / pilot plant AD operations for seeding ~20micron pure CO2 microbubbles for 5 minutes daily. The optimisation study showed 4-6 fold increase in biogas production rates.
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