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Mathematical modelling as a tool to study population dynamics between sulfate reducing and methanogenic bacteria
S Kalyuzhnyi1, V Fedorovich, P Lens
1Department of Chemical Enzymology, Chemistry Faculty, Moscow State University, Russia.
Biodegradation
|February 18, 1999
Summary
This study reviews mathematical models for sulphate-fed anaerobic reactors, focusing on sulphide inhibition and microbial competition. An integrated model was developed and validated for granular sludge reactors, aiding optimization of sulphate conversion.
Area of Science:
- Environmental Engineering
- Biotechnology
- Chemical Engineering
Background:
- Mathematical models for sulphate-fed anaerobic reactors are crucial for understanding complex microbial interactions.
- Sulphide inhibition and competition between sulphate reduction and methanogenesis significantly impact reactor performance.
- Existing models often lack comprehensive integration of various operational and biological factors.
Purpose of the Study:
- To review existing mathematical models for sulphate-fed anaerobic reactors.
- To present an integrated mathematical model for sulphate-fed granular sludge reactors.
- To investigate the influence of engineering parameters on reactor performance and sulphate conversion through simulations.
Main Methods:
- Review of existing mathematical models, with emphasis on sulphide inhibition and microbial competition.
- Development of an integrated model incorporating hydrodynamic, kinetic, physico-chemical, and mass transfer blocks.
- Calibration and validation of the model using laboratory studies on sulphidogenic granular sludge reactors.
- Supplementation with hypothetical computer simulations to explore engineering parameter impacts.
Main Results:
- The integrated model successfully accounts for concentration gradients, multiple reaction stoichiometry, and kinetics.
- Model calibration and validation confirmed its accuracy in predicting reactor start-up and sulphide yield.
- Simulations demonstrated the significant influence of engineering parameters on sulphate conversion and reactor efficiency.
Conclusions:
- The developed integrated mathematical model provides a robust framework for analyzing sulphate-fed granular sludge reactors.
- The model aids in understanding and optimizing operational parameters for enhanced sulphate conversion and sulphide production.
- This approach facilitates predictive modelling for improved design and management of anaerobic reactor systems.