Ectoines production from biogas in pilot bubble column bioreactors and their subsequent extraction via bio-milking
•The performance of 2 bioreactors interconnected at 0 and 6% NaCl was evaluated.•The stand-alone reactor supported the highest ectoine productivity and robustness.•The increase in N concentration and gas recirculation enhanced microbial activity.•Ectoine recovery via bacterial milking resulted in ef...
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Published in | Water research (Oxford) Vol. 245; p. 120665 |
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Main Authors | , , , , , , , |
Format | Journal Article |
Language | English |
Published |
Elsevier Ltd
15.10.2023
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Subjects | |
Online Access | Get full text |
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Summary: | •The performance of 2 bioreactors interconnected at 0 and 6% NaCl was evaluated.•The stand-alone reactor supported the highest ectoine productivity and robustness.•The increase in N concentration and gas recirculation enhanced microbial activity.•Ectoine recovery via bacterial milking resulted in efficiencies >70%.•Methylomicrobium was the main strain responsible for CH4 degradation.
Despite the potential of biogas from waste/wastewater treatment as a renewable energy source, the presence of pollutants and the rapid decrease in the levelized cost of solar and wind power constrain the use of biogas for energy generation. Biogas conversion into ectoine, one of the most valuable bioproducts (1000 €/kg), constitutes a new strategy to promote a competitive biogas market. The potential for a stand-alone 20 L bubble column bioreactor operating at 6% NaCl and two 10 L interconnected bioreactors (at 0 and 6% NaCl, respectively) for ectoine production from biogas was comparatively assessed. The stand-alone reactor supported the best process performance due to its highest robustness and efficiency for ectoine accumulation (20–52 mgectoine/gVSS) and CH4 degradation (up to 84%). The increase in N availability and internal gas recirculation did not enhance ectoine synthesis. However, a 2-fold increase in the internal gas recirculation resulted in an approximately 1.3-fold increase in CH4 removal efficiency. Finally, the recovery of ectoine through bacterial bio-milking resulted in efficiencies of >70% without any negative impact of methanotrophic cell recycling to the bioreactors on CH4 biodegradation or ectoine synthesis.
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Bibliography: | ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
ISSN: | 0043-1354 1879-2448 |
DOI: | 10.1016/j.watres.2023.120665 |