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Related Experiment Videos

Variable stoichiometry with thermodynamic control in ADM1.

J Rodríguez1, J M Lema, M C M van Loosdrecht

  • 1Department of Chemical Engineering, Universidade de Santiago de Compostela, School of Engineering, Spain. jorger@usc.es

Water Science and Technology : a Journal of the International Association on Water Pollution Research
|October 14, 2006
PubMed
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Investigating variable stoichiometry in anaerobic digestion models reveals minimal impact on effluent quality or system robustness under overload. Thermodynamic control is suggested for carbohydrate fermentation processes.

Area of Science:

  • Environmental science
  • Biotechnology
  • Chemical engineering

Background:

  • Anaerobic digestion models typically use fixed stoichiometry for fermentation.
  • Existing models like the IWA Anaerobic Digestion Model No.1 (ADM1) have limitations with mixed COD-mol bases.
  • Variable stoichiometry can offer a more accurate representation of biological processes.

Purpose of the Study:

  • To investigate the effect of variable stoichiometry in carbohydrate fermentation within the ADM1.
  • To adapt ADM1 for variable stoichiometry by converting it to a mol-based system.
  • To assess the impact of variable stoichiometry on anaerobic digestion performance.

Main Methods:

  • Transformed ADM1 into a mol-based model to implement variable stoichiometry.

Related Experiment Videos

  • Linked carbohydrate fermentation yields to hydrogen concentration and pH based on thermodynamic models.
  • Simulated single- and two-step anaerobic digestion configurations under overload conditions.

    • Main Results:

    • No significant difference in effluent quality or system robustness between standard and variable stoichiometry ADM1 under overload.
    • Non-limiting acetogenic activity compensated for acidogenic product changes, typical for near-equilibrium processes.
    • Observed behavior suggests thermodynamic control over kinetic control for these conversions.

    Conclusions:

    • Variable stoichiometry in ADM1 carbohydrate fermentation showed limited impact on system performance under tested conditions.
    • Thermodynamic control appears more influential than kinetic control for these specific conversions.
    • Lumping carbohydrate fermenters and oxidative acetogens with variable stoichiometry is a potential simplification for future modeling efforts.