AI Article Synopsis
- The study evaluated the performance of microbial fuel cells using different heterogeneous ion exchange membranes, measuring key metrics like maximal current density, electron recovery efficiency, and energy production rate with acetate as a substrate.
- It found that the performance varied based on the membrane type, specifically regarding oxygen and acetate crossover, and that certain membranes enhanced the growth of more air-tolerant microbes.
- This suggests that the membrane's oxygen mass transfer coefficient directly influences microbial diversity and stability over time, affecting long-term operation of the fuel cells.
Article Abstract
In this study, microbial fuel cells deploying heterogeneous ion exchange membranes were assessed. The behavior of the cells as a function of the membrane applied was evaluated in terms of maximal current density, electron recovery efficiency and energy production rate (up to 427.5 mA, 47.7 % and 660 J mh, respectively) at different substrate (acetate) feedings (2.15 - 8.6 mM). System performance was characterized in the light of oxygen and acetate crossovers. The effect of membranes (in relation to the oxygen mass transfer coefficient, k) on the microbial diversity of anodic and membrane-surface biofilms was investigated. Based on the relative abundance of bacterial orders, the two populations could be distinguished and membranes with larger k tended to promote more the air-tolerant microbes in the biofouling layer. This indicates that membrane k has a direct effect on membrane foulant microbial composition, and thus, on the expected time-stability of the membrane.
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| http://dx.doi.org/10.1016/j.biortech.2022.127628 | DOI Listing |
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