Enhancing the anaerobic digestion process through carbon dioxide enrichment: initial insights into mechanisms of utilization

Enhancing the anaerobic digestion process through carbon dioxide enrichment: initial insights into mechanisms of utilization

Carbon dioxide (CO 2 ) enrichment of anaerobic digesters (ADs) without hydrogen addition has been demonstrated to provide a potential solution to manage CO 2 streams generated in the water and organic waste sectors, with concomitant increases in methane (CH 4 ) production. This study investigates th...

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Bibliographic Details
Published in:Environmental technology 2019-06, Vol.40 (13), p.1744-1755
Main Authors: Bajón Fernández, Yadira, Soares, Ana, Vale, Peter, Koch, Konrad, Masse, Anne Laure, Cartmell, Elise
Format: Article
Language:eng
Subjects:
Abundance
Ammonia
Anaerobic digestion
Anaerobic processes
Biotechnology
Carbon dioxide
Carbon isotopes
Chemical engineering
Chemical Sciences
Enrichment
Environmental Engineering
Environmental Sciences
Fluorescence
Food
Food waste
Homoacetogenesis
Life Sciences
mechanisms
Methane
Methanogenesis
Organic chemistry
Organic wastes
Radiolabelling
Sewage sludge
Sludge
Streams
Utilization
valorization
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Summary:Carbon dioxide (CO 2 ) enrichment of anaerobic digesters (ADs) without hydrogen addition has been demonstrated to provide a potential solution to manage CO 2 streams generated in the water and organic waste sectors, with concomitant increases in methane (CH 4 ) production. This study investigates the CO 2 utilization mechanisms, by considering chemical and biological pathways in food waste and sewage sludge ADs. Methanosaetaceae was observed to be the dominant methanogen in sewage sludge ADs (Abundance of 83.8-98.8%) but scarce in food waste units (3.5-5.8%). Methanosarcinaceae was dominant in food waste (14.3-32.4%), likely due to a higher tolerance to the free ammonia nitrogen concentration recorded (885 mg L −1 ). R Methanosaetaceae (ratio of Methanosaetaceae fluorescence signal between test and control) of 1.45 and 1.79 were observed for sludge ADs enriched once and periodically with CO 2 , respectively (p-value  
ISSN:0959-3330
1479-487X