Self-consistent liquid-to-gas mass transfer calculations.

Area of Science:

• Biochemical Engineering
• Environmental Science
• Chemical Engineering

Background:

• Current gas transfer calculation methods in anaerobic digestion modeling present significant challenges.
• One existing method suffers from computational stiffness, hindering efficient simulation.
• The alternative method introduces artificial overpressure, compromising model accuracy.

Purpose of the Study:

• To develop a novel and improved gas transfer calculation method for anaerobic digestion modeling.
• To address the limitations of existing computational stiffness and artificial overpressure issues.
• To enhance the accuracy and stability of biogas production simulations.

Main Methods:

• The new approach utilizes the principle that gas partial pressures equal partial flows at the liquid/gas interface.
• Gas pressure equations were derived based on self-consistency requirements.
• A search algorithm was employed to solve the developed gas pressure equations.

Main Results:

• The alternative method achieved high flow precision (better than 2x10(-7) mol h(-1) l(-1)) within approximately three iterations.
• The new approach demonstrated excellent self-consistency and stability.
• The method proved effective even when simulating systems with up to eight different gases.

Conclusions:

• The developed gas transfer calculation method provides a stable and accurate alternative for anaerobic digestion modeling.
• This advancement can lead to more reliable simulations of biogas production and related processes.
• The method's robustness with multiple gases suggests broad applicability in complex biochemical systems.