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Emerging Biochemical Conversion for Plastic Waste Management: A Review
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This review examines emerging chemical and biological technologies for converting plastic waste, including hydrolysis, pyrolysis, photolysis, and microbial enzymatic degradation, which break down high-molecular-weight plastics into reusable small molecules. The authors highlight the need for economic analyses and life cycle assessments to overcome the scalability challenges facing these innovative plastic waste management approaches.
In recent years, vast amounts of plastic waste have been released into the en- vironment worldwide, posing a severe threat to human health and ecosystems. Despite the partial success of traditional plastic waste management technologies, their limitations underscore the need for innovative approaches. This review provides a comprehensive overview of recent advancements in chemical and biological technologies for converting and utilizing plastic waste. Key topics include the technical parameters, characteristics, processes, and reaction mechanisms underlying these emerging technologies. Addition- ally, the review highlights the importance of conducting economic analyses and life cycle assessments of these emerging technologies, offering valuable insights and establishing a robust foundation for future research. By leveraging literature from the past five years, this review explores innovative chemical approaches, such as hydrolysis, hydrogenolysis, alcoholysis, ammonolysis, pyrolysis, and photolysis, which break down high-molecular-weight macromolecules into oligomers or small molecules by cracking or depolymerizing specific chemical groups within plastic molecules. It also examines in- novative biological methods, including microbial enzymatic degradation, which employs microorganisms or enzymes to convert high molecular -weight macromolecules into oli- gomers or small molecules through degradation and assimilation mechanisms. The r e- view concludes by discussing future research directions focused on addressing the technological, economic, and scalability challenges of emerging plastic waste manage- ment technologies, with a strong commitment to promoting sustainable solutions and achieving lasting environmental impact.
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