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Biotechnological Aspects and Mathematical Modeling of the Biodegradation of Plastics under Controlled Conditions
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Mathematical models of plastic biodegradation kinetics under controlled conditions were reviewed and evaluated for their ability to capture the complex interplay of biological, physical, and chemical processes involved in plastic breakdown. The review identifies key modeling challenges and argues that better kinetic frameworks are needed to predict real-world plastic degradation rates and inform waste management strategies.
The strong environmental impact caused by plastic pollution has led research to address studies from different perspectives. The mathematical modeling of the biodegradation kinetics of solid materials is a major challenge since there are many influential variables in the process and there is interdependence of microorganisms with internal and external factors. In addition, as solid substrates that are highly hydrophobic, mass transfer limitations condition degradation rates. Some mathematical models have been postulated in order to understand the biodegradation of plastics in natural environments such as oceans. However, if tangible and optimizable solutions are to be found, it is necessary to study the biodegradation process under controlled conditions, such as using bioreactors and composting systems. This review summarizes the biochemical fundamentals of the main plastics (both petrochemical and biological origins) involved in biodegradation processes and combines them with the main mathematical equations and models proposed to date. The different biodegradation studies of plastics under controlled conditions are addressed, analyzing the influencing factors, assumptions, model developments, and correlations with laboratory-scale results. It is hoped that this review will provide a comprehensive overview of the process and will serve as a reference for future studies, combining practical experimental work and bioprocess modeling systems.
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