The Intriguing Effect of Co2 Enrichment in Anaerobic Digestion

38 Pages Posted: 9 Sep 2024

See all articles by Mohammad Javad Bardi

Mohammad Javad Bardi

affiliation not provided to SSRN

Felix Müller

affiliation not provided to SSRN

Daniela Polag

affiliation not provided to SSRN

Nigus Gabbiye Habtu

Bahir Dar University - Department of Chemical Engineering

Konrad Koch

Technische Universität München (TUM)

Abstract

This study presents the effect of carbon dioxide enrichment in the anaerobic digestion process, aiming to enhance biomethane production while investigating the degradation kinetics and the evolution of methanogenic pathways. It was found that carbon dioxide enrichment facilitates better digestion of inoculum, providing an extra energy source for methanogenic archaea. Consequently, the methane yield of blank inocula increased by 53% to 77% after carbon dioxide enrichment. The further digestion of inocula residues required a longer duration, as observed by a prolonged lag phase of methane production up to 3.1 times. Higher methane production, corresponding with a significant reduction in chemical oxygen demand (COD), confirms the effect of carbon dioxide enrichment on inocula digestion. Isotope analysis showed an increase in δ²H-CH₄ values by approximately 36 mU compared to non-enriched inoculum, implying intensified hydrogenotrophic methanogenesis.

Keywords: Anaerobic digestion, CO2 enrichment, Specific methane production, Inocula residuals, Hydrogenotrophic methanogens

Suggested Citation

Bardi, Mohammad Javad and Müller, Felix and Polag, Daniela and Habtu, Nigus Gabbiye and Koch, Konrad, The Intriguing Effect of Co2 Enrichment in Anaerobic Digestion. Available at SSRN: https://ssrn.com/abstract=4951485 or http://dx.doi.org/10.2139/ssrn.4951485

Mohammad Javad Bardi

affiliation not provided to SSRN ( email )

No Address Available

Felix Müller

affiliation not provided to SSRN ( email )

No Address Available

Daniela Polag

affiliation not provided to SSRN ( email )

No Address Available

Nigus Gabbiye Habtu

Bahir Dar University - Department of Chemical Engineering ( email )

Bahir Dar
Ethiopia

Konrad Koch (Contact Author)

Technische Universität München (TUM) ( email )

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