Abstract
Microbial electrosynthesis (MES) is an electricity-driven microbial CO2 fixation process. It is challenging to achieve high coulombic efficiency (CE) in hydrogen-mediated MES reactors due to the poor hydrogen mass transfer. Here, we report that the addition of porous polyurethane (PU) particles could promote the kLa of H2 by 102%, and thereby enhancing the acetate production rate and CE of a hydrogen-mediated MES reactor by 59% and 11%, respectively. The enhanced performance could be attributed to the promotion of the suspended biomass growth. The maximum acetate production rate (1.48 g·L−1·d−1) and the acetate titer (17.22 g·L−1) achieved in the reactor with PU particles were higher than those of the most reported MES reactors. Microbial community analysis indicated that the impact of PU particles on the bacterial community was negligible. These results demonstrated the addition of PU particles is an efficient way to enhance the performance of hydrogen-mediated MES reactors.
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