Loading...
Please wait, while we are loading the content...
Similar Documents
Fundamental Insights into Propionate Oxidation in Microbial Electrolysis Cells Using a Combination of Electrochemical, Molecular biology and Electron Balance Approaches
| Content Provider | Semantic Scholar |
|---|---|
| Author | Rao, Hari Ananda |
| Copyright Year | 2016 |
| Abstract | Microbial electrolysis cells (MECs) provide a viable approach for bioenergy generation from fermentable substrates such as propionate. However, the paths of electron flow during propionate oxidation in the anode of MECs are unknown. Here, the paths of electron flow involved in propionate oxidation in the anode of two-chambered MECs were examined at low (4.5 mM) and high (36 mM) propionate concentrations. Electron mass balances and microbial community analysis are revealed that multiple paths of electron flow (via acetate/H2 or acetate/formate) to current could occur simultaneously during propionate oxidation regardless of the concentration tested. Current (57-96%) was the largest electron sink and methane (0-2.3%) production was relatively unimportant at both concentrations based on electron balance. At low propionate concentration, reactors supplemented with 2-bromoethanesulfonate had slightly higher coulombic efficiencies than reactors lacking this methanogenesis inhibitor. However, an opposite trend was observed at high propionate concentration, where reactors supplemented with 2bromoethanesulfonate had lower coulombic efficiency and there was a greater percentage of electrons loss (23.5%) to undefined sinks compared to reactors without 2bromoethanesulfonate (11.2%). Propionate removal efficiencies were 98% (low propionate concentration) and 78% (high propionate concentration). Analysis of 16S rRNA gene pyrosequencing revealed the dominance of sequences most similar to G. sulfurreducens PCA and G. sulfurreducens subsp. ethanolicus. Collectively, these results provide new insights on the paths of electron flow during propionate oxidation in the anode of MECs fed with low and high propionate concentrations. 39 2. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | https://repository.kaust.edu.sa/bitstream/handle/10754/621823/Hari%20Ananda%20Rao_Dissertation.pdf?isAllowed=y&sequence=1 |
| Alternate Webpage(s) | https://doi.org/10.25781/KAUST-E6R32 |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
