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Lagrangian solver for coupling hydrodynamics with biokinetic conversion modelling in anaerobic digesters
Prashant Kumar1, Jeremy Z Yan1, Nikolaus Rauch2
1Room 312, Unit of Environmental Engineering, University of Innsbruck, Technikerstrasse 23b, Innsbruck, 6020, Austria.
Water Research
|February 3, 2024
Summary
This study integrates computational fluid dynamics with anaerobic digestion models for wastewater treatment. The novel software toolbox enhances accuracy in predicting biochemical processes by considering hydrodynamics.
Area of Science:
- Environmental Engineering
- Biochemical Engineering
- Computational Science
Background:
- Conventional anaerobic digestion models often lack accuracy due to simplified hydrodynamic considerations in wastewater treatment tanks.
- Hydrodynamics significantly influence biochemical reaction rates and overall digester performance.
- Integrating fluid dynamics with biochemical models is crucial for improving process understanding and prediction.
Purpose of the Study:
- To introduce a novel software toolbox that couples the Standard Anaerobic Digestion Model No. 1 (ADMI) with particle-based Lagrangian simulations.
- To enhance the accuracy of anaerobic digestion modeling by incorporating hydrodynamic effects on biochemical processes.
- To provide a tool for improved optimization and predictive modeling in wastewater treatment.
Main Methods:
- Development of a C++ software toolbox implementing ADMI.
- Integration of the ADMI solver with particle-based Lagrangian computational fluid dynamics (CFD) simulations.
- Conceptual and numerical verification of the integrated model, including a case study on a 3D lab-scale digester.
Main Results:
- The integrated approach provides significantly more insights into the biochemical conversion process compared to conventional models.
- The software toolbox successfully interfaces CFD simulations with ADMI, accounting for hydrodynamic impacts.
- Case study results demonstrate the solver's capability in a realistic 3D digester scenario, showing improved accuracy over the standard ADMI.
Conclusions:
- The developed integrated approach offers a more accurate and insightful method for modeling anaerobic digestion in wastewater treatment.
- The software toolbox serves as a valuable tool for operators and designers for process optimization and predictive modeling.
- Accounting for hydrodynamics is essential for advancing the reliability of anaerobic digestion simulations.
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