Mathematical Model of a Thermophilic Anaerobic Digestion for Methane Production of Wheat Straw

This paper presents a newly created mathematical model of thermophilic anaerobic digestion of wheat straw carried out in a 2 dm3 bioreactor for methane production. Two batch processes, with 30 mL/dm3 and 35 mL/dm3 organic load, are carried out—one set for parameter identification and one set for mod...

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Bibliographic Details
Published in:Processes 2022-04, Vol.10 (4), p.742
Main Authors: Chorukova, Elena, Kabaivanova, Lyudmila, Hubenov, Venelin, Simeonov, Ivan, Roeva, Olympia
Format: Article
Language:English
Subjects:
Algorithms
Alternative energy sources
Anaerobic digestion
Batch processes
Batch processing
Biodiesel fuels
Biofuels
Biogas
Biomass
Bioreactors
Cellulose
Experiments
Genetic algorithms
Heuristic methods
Lignin
Lignocellulose
Mathematical models
Methane
Methods
Organic loading
Parameter identification
Particle size
Process variables
Quadratic programming
Renewable resources
Straw
Verification
Wheat
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Summary:This paper presents a newly created mathematical model of thermophilic anaerobic digestion of wheat straw carried out in a 2 dm3 bioreactor for methane production. Two batch processes, with 30 mL/dm3 and 35 mL/dm3 organic load, are carried out—one set for parameter identification and one set for model verification. The identification of model parameter values is based on dynamical experiments. It is fulfilled using two different techniques: deterministic sequential quadratic programming algorithm and metaheuristic genetic algorithm. Verification of the developed mathematical models is conducted based on the different data sets of the process. Both models predict the set of the experimental data for all considered process variables well. Genetic algorithm visually fits the data with a higher degree of accuracy, as confirmed by the numerical results for the objective function value.
ISSN:2227-9717
2227-9717
DOI:10.3390/pr10040742