The diagrams delineate two distinct pathways in the management of plastic waste: a closed-loop recycling system for plastic bottles and a linear disposal route culminating in landfill.
Overall, the cyclical process comprises six stages, emphasizing continuous reuse, while the linear process involves eight steps, ultimately leading to waste accumulation. A key feature is the divergent treatment of plastic bottles versus plastic bags and general rubbish, highlighting the selective nature of current recycling infrastructures.
The recycling loop commences with the collection of discarded plastic bottles, which are then transported to a sorting facility. Here, the bottles undergo categorization based on polymer type and colour, prior to being conveyed to a processing plant via truck. At this facility, the sorted plastic is repurposed into new consumer products, subsequently distributed to retail outlets. Following purchase and consumption, these bottles are reintroduced into the collection stream, perpetuating the cyclical process. Conversely, plastic bags and mixed waste follow a separate trajectory.
In stark contrast to the bottle recycling system, plastic bags and general refuse are directly routed to landfill sites. This disposal reflects a significant disparity in the handling of different plastic waste streams, underscoring the limitations of current recycling practices and the pervasive reliance on landfill as the ultimate destination for much plastic waste.