Abstract
Globally, there is rising awareness of the severity of the plastic waste problem, and the implications of plastics accumulation in the environment. Current methods of waste management are anticipated to be insufficient in mitigating the long-term negative impact on society and the environment. Plastics recycling is one of many solutions that have been proposed, one of the most ecologically-friendly, as well as holding great economic potential by its realization into a circular economy. The technological know-how already exists for a number of different methods for plastic recycling; however, they are broadly uneven in their implementation due to feasibility and cost issues. Here, we review and compare methods of tertiary recycling—that is, complete breakdown of plastics into its chemical component materials—and offer an analysis of the potential obstacles that have to be addressed to increase waste plastic recycling rates. While chemical recycling methods are simpler and are already pilot tested at an industrial level, biological recycling either via microorganisms or biological-derived enzymes are as yet unproven but highly promising technologies. Looking forward, trend shifts towards more ecologically-friendly processes will drive initiatives to close the loop on commercial plastic production.
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