In-situ biogas upgrading process: modeling and simulations aspects

Giovanna Lovato, Merlin Alvarado-Morales, Adam Kovalovszki, Maria Peprah, Panagiotis Kougias, José Alberto Domingues Rodrigues, Irini Angelidaki

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    Abstract

    Biogas upgrading processes by in-situ hydrogen (H2) injection are still challenging and could benefit from a mathematical model to predict system performance. Therefore, a previous model on anaerobic digestion was updated and expanded to include the effect of H2 injection into the liquid phase of a fermenter with the aim of modeling and simulating these processes. This was done by including hydrogenotrophic methanogen kinetics for H2 consumption and inhibition effect on the acetogenic steps. Special attention was paid to gas to liquid transfer of H2. The final model was successfully validated considering a set of Case Studies. Biogas composition and H2 utilization were correctly predicted, with overall deviation below 10% compared to experimental measurements. Parameter sensitivity analysis revealed that the model is highly sensitive to the H2 injection rate and mass transfer coefficient. The model developed is an effective tool for predicting process performance in scenarios with biogas upgrading.
    Original languageEnglish
    JournalBioresource Technology
    Volume245
    Issue numberPart A
    Pages (from-to)332-341
    ISSN0960-8524
    DOIs
    Publication statusPublished - 2017

    Keywords

    • Biogas upgrading
    • Hydrogenotrophic methanogens
    • Mathematical modeling
    • Sensitivity analysis

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