Achieving high hydrogen productivities of 20 L/L-day via microbial electrolysis of corn stover fermentation products

Satinover, Scott J.; Schell, Daniel J.; Borole, Abhijeet P.

doi:10.1016/j.apenergy.2019.114126

Cited by 25 publications

(25 citation statements)

References 58 publications

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“…Current density and hydrogen productivity were observed to be linearly correlated with the organic loading rate. Prior studies have shown similar correlations between organic loading and hydrogen productivity up to an organic loading rate of 10 g/L-day using biomass pyrolysis aqueous phase [24,33,34], and up to 30 g/L-day using corn stover fermentation product [22].…”

Section: Electrochemical Performance Of Mecs Under Closed Circuit Conmentioning

confidence: 65%

“…reported current densities of 6.8 ± 0.33 A/m 2 and a hydrogen productivity of 7.0 ± 0.50 L/L-day with CFP [22]. Other MECs using biomass feedstocks have not performed this well, several of which are orders of magnitude lower than what is produced here [5,31,32].…”

Section: Electrochemical Performance Of Mecs Under Closed Circuit Conmentioning

confidence: 89%

“…To advance MEC technology, the simultaneous integration of effective strategies is necessary. Highperformance systems can be developed by combining as many of the design and operating parameters as possible into one system [21,22].…”

Section: Complex Wastes Can Be Composed Of Hundreds Of Individual Commentioning

confidence: 99%

“…The goal of this study is to investigate the microbial diversity of MECs fed with complex feedstocks using MECs with previously demonstrated high performance. Thus, a MEC design that previously reported hydrogen productivities of 17.9 L/L-day using a complex substrate derived from corn stover [22] was used. The MECs were inoculated with a pre-developed community [13], grown to maturity indicated by generating the necessary current for such high performance, and investigated with ve different substrates in a speci c sequence and using a de ned adaptation protocol.…”

Section: Complex Wastes Can Be Composed Of Hundreds Of Individual Commentioning

confidence: 99%

“…The ve substrates used in the study included a pyrolysis bio-oil aqueous phase from switchgrass (BOAP) [24], a pyrolysis bio-oil aqueous phase from red oak (ROBOAP) [25], a corn stover fermentation product (CFP) [22,26,27], a blend of equal parts acetate and phenol by grams of chemical oxygen demand (phe/ace), and acetate. The three complex feedstocks tested contained some similar characteristics despite the differences in pretreatment used.…”

Section: Substrate Characterizationmentioning

confidence: 99%

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Performance and Community Structure Dynamics of Microbial Electrolysis Cells Operated on Multiple Complex Feedstocks

Satinover

Rodríguez

Campa

et al. 2020

Preprint

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Background Microbial electrolysis is a promising technology for converting aqueous wastes into hydrogen. Substrate adaptability is an important feature, seldom documented in Microbial Electrolysis Cells (MECs). The correlation between substrate composition and community structure has not been well established. This study used a MEC capable of producing over 10 L/L-day of hydrogen from a switchgrass-derived bio-oil aqueous phase and investigated four additional substrates. The additional substrates included a red oak-derived bio-oil aqueous phase, a corn stover fermentation product, a mixture of phenol and acetate, and acetate alone. Results The MEC fed with the corn stover fermentation product resulted in the highest performance among the complex feedstocks, producing an average current density of 7.3 A/m2, although the acetate fed MEC outperformed complex substrates, producing 12 ± A/m2. 16S rRNA gene sequencing showed that community structure and community diversity were not predictive of performance, and replicate community structures diverged despite identical inoculum and enrichment procedure. The trends in each replicate, however, were indicative of the influence of the substrates. Geobacter was the most dominant genus across most of the samples tested, but its abundance did not correlate strongly to current density. High-performance liquid chromatography (HPLC) showed that acetate accumulated during open-circuit conditions when MECs were fed with complex feedstocks and was quickly degraded once closed-circuit conditions were applied. The largest net acetic acid removal rate occurred when MECs were fed with red oak bio-oil aqueous phase, consuming 2.93 ± 0.00 g/L-day. Principal component analysis found that MEC performance metrics such as current density, hydrogen productivity, and COD removal were closely correlated. Net acetic acid removal was also found to correlate with performance. However, no bacterial genus correlated to performance metrics, and the analysis suggested that less than 70% of the variance was accounted for by the two components. Conclusions This study demonstrates the robustness of microbial communities to adapt to a range of feedstocks and conditions without relying on specific species, delivering high hydrogen productivities, thus indicating functional adaptation vs. compositional requirement. MECs may,, play a central role in the 21st-century bioeconomy as factories producing a zero-emission fuel.

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Section: Electrochemical Performance Of Mecs Under Closed Circuit Conmentioning

confidence: 65%

Section: Electrochemical Performance Of Mecs Under Closed Circuit Conmentioning

confidence: 89%

Section: Complex Wastes Can Be Composed Of Hundreds Of Individual Commentioning

confidence: 99%

Section: Complex Wastes Can Be Composed Of Hundreds Of Individual Commentioning

confidence: 99%

Section: Substrate Characterizationmentioning

confidence: 99%

See 3 more Smart Citations

Performance and Community Structure Dynamics of Microbial Electrolysis Cells Operated on Multiple Complex Feedstocks

Satinover

Rodríguez

Campa

et al. 2020

Preprint

Self Cite

View full text Add to dashboard Cite

show abstract

Recent Advances in Microbial Electrolysis Cells for High Production of Hydrogen

Ibrahim,

Balachandran,

Zhong

et al. 2024

Sustainable Materials and Technology

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Microbial electrolysis cells and microbial fuel cells for biohydrogen production: current advances and emerging challenges

Saravanan¹,

Karishma²,

Kumar

et al. 2020

Biomass Conv. Bioref.

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Achieving high hydrogen productivities of 20 L/L-day via microbial electrolysis of corn stover fermentation products

Cited by 25 publications

References 58 publications

Performance and Community Structure Dynamics of Microbial Electrolysis Cells Operated on Multiple Complex Feedstocks

Performance and Community Structure Dynamics of Microbial Electrolysis Cells Operated on Multiple Complex Feedstocks

Recent Advances in Microbial Electrolysis Cells for High Production of Hydrogen

Microbial electrolysis cells and microbial fuel cells for biohydrogen production: current advances and emerging challenges

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