Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7705429 | International Journal of Hydrogen Energy | 2018 | 8 Pages |
Abstract
Microbial electrolysis for hydrogen production exhibited great advantages over many other biohydrogen production techniques in terms of hydrogen yield (HY) and energy efficiency (EE). With the elimination of methanogens, homoacetogens could thrive as the major hydrogen sink to impair HY and EE. However, the determination of hydrogen loss in microbial electrolysis cells (MECs) was rather controversial. In this study, we quantitatively investigated the negative impact of homoacetogens on hydrogen recovery in single chamber MECs. Hydrogen partial pressure (HPP) ranging from 0 to 40Â kPa greatly affected the hydrogen consumption rate while acetate concentration ranging from 0 to 100Â mM had little impact. HY base on consumed substrate was not significantly affected with less than 20Â kPa HPP but decreased from 87% to 66% with 20-34Â kPa HPP. And the EE based on input electricity was decreased from 160% to 48% accompanied with the increase of HPP from 7 to 34Â kPa. Microbial community analysis revealed that Acetobacterium was the dominant homoacetogenic hydrogen scavenger in cathodic biofilm and planktonic cells in the single chamber MECs.
Keywords
Related Topics
Physical Sciences and Engineering
Chemistry
Electrochemistry
Authors
Luguang Wang, Lakhveer Singh, Hong Liu,