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Improvements to the ADM1 based Process Simulation Model: Reaction segregation, parameter estimation and process

Rami Bechara1

  • 1Lebanese American University, Department of Civil Engineering, LAU Byblos Campus, P.O. Box 36, Byblos, Lebanon.

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|December 5, 2022
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Summary

This study introduces an advanced Aspen Plus model for anaerobic digestion, optimizing biogas production from organic waste. The developed model significantly enhances methane yield, contributing to sustainable energy recovery.

Keywords:
Anaerobic Digestion Model 1Anaerobic digestionAspen PlusParameter fittingProcess modelingProcess optimization

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Area of Science:

  • Biotechnology and Bioengineering
  • Environmental Science
  • Chemical Engineering

Background:

  • Anaerobic digestion is a key sustainable technology for organic waste treatment and energy recovery through biogas generation.
  • Optimizing anaerobic digestion processes is crucial for maximizing biogas yield and efficiency.

Purpose of the Study:

  • To develop and validate a novel Aspen Plus flowsheet based on the Anaerobic Digestion Model 1 (ADM1) for anaerobic digestion.
  • To improve methane production through detailed modeling and parameter optimization.

Main Methods:

  • Implementation of a multi-segment reactor model in Aspen Plus, incorporating stoichiometric, kinetic, and equilibrium phases.
  • Calibration of model parameters, including conversion ratios and kinetic factors, against experimental data.
  • Utilizing sensitivity analysis and optimization runs to identify key operational parameters.

Main Results:

  • Achieved a high model-experiment fit with R² = 0.999, indicating robust model accuracy.
  • Demonstrated the significant impact of inhibition factors on the process dynamics.
  • Simulation results showed a characteristic bell-shaped curve for volatile fatty acid reduction and a 50% increase in methane production ratio post-optimization.

Conclusions:

  • The developed ADM1-based Aspen Plus model provides a powerful tool for understanding and optimizing anaerobic digestion.
  • The findings highlight the critical role of inhibition and parameter tuning for enhanced biogas and methane yields.
  • This work offers a significant contribution to the design and operation of efficient anaerobic digestion systems for sustainable energy production.