TY - JOUR
T1 - Repression of hydrogen uptake using conjugated oligoelectrolytes in microbial electrolysis cells
AU - Hou, Huijie
AU - Chen, Xiaofen
AU - Liu, Jia
AU - Zhu, Xiuping
AU - Bazan, Guillermo C.
AU - Logan, Bruce E.
N1 - Funding Information:
We thank Professor James G. Ferry at Penn State for providing cultures of M. acetivorans and Dr. Michael Siegert for helping to culture M. acetivorans . This work was funded by Award KUS-I1-003-13 from the King Abdullah University of Science and Technology (KAUST) and the Institute for Collaborative Biotechnologies (ICB) under grant W911F-09-D-0001 from the U.S. Army Research Office.
Publisher Copyright:
Copyright © 2014, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
PY - 2014
Y1 - 2014
N2 - DSBN+, a conjugated oligoelectrolyte (COE), was added to microbial electrolysis cells (MECs) to improve hydrogen recovery. The volume of hydrogen gas recovered in a fedbatch cycle of mixed culture MECs increased by 126× compared to controls (no COE addition), mainly by preventing the loss of hydrogen to methane production. Performance in pure culture MECs fed with Geobacter sulfurreducens increased by factors of 10.5 in terms of energy yield, 2.1 in COD removal, and 11.8 in hydrogen yield. Hydrogen gas recycling was reduced, and the volume of hydrogen gas recovered increased by 6.5× compared to controls. Minimal methane production and a lack of hydrogen gas uptake by G. sulfurreducens suggested that the COEs increased hydrogen recoveries by interfering with hydrogen uptake by hydrogenotrophic methanogens but also by exoelectrogenic bacteria. COEs may therefore be useful for inhibiting the activities of certain hydrogenases, although the mechanism of inhibition needs further investigation.
AB - DSBN+, a conjugated oligoelectrolyte (COE), was added to microbial electrolysis cells (MECs) to improve hydrogen recovery. The volume of hydrogen gas recovered in a fedbatch cycle of mixed culture MECs increased by 126× compared to controls (no COE addition), mainly by preventing the loss of hydrogen to methane production. Performance in pure culture MECs fed with Geobacter sulfurreducens increased by factors of 10.5 in terms of energy yield, 2.1 in COD removal, and 11.8 in hydrogen yield. Hydrogen gas recycling was reduced, and the volume of hydrogen gas recovered increased by 6.5× compared to controls. Minimal methane production and a lack of hydrogen gas uptake by G. sulfurreducens suggested that the COEs increased hydrogen recoveries by interfering with hydrogen uptake by hydrogenotrophic methanogens but also by exoelectrogenic bacteria. COEs may therefore be useful for inhibiting the activities of certain hydrogenases, although the mechanism of inhibition needs further investigation.
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U2 - 10.1016/j.ijhydene.2014.09.101
DO - 10.1016/j.ijhydene.2014.09.101
M3 - Article
AN - SCOPUS:84922601826
SN - 0360-3199
VL - 39
SP - 19407
EP - 19415
JO - International Journal of Hydrogen Energy
JF - International Journal of Hydrogen Energy
IS - 34
ER -
