9.24C - Evaluating polymer recycling
Weigh the costs, resource savings and environmental effects of polymer recycling, using evidence to reach a judgement for a particular waste stream and product.
What recycling can save
Recycling collects and processes waste polymer so the material can be used in another product. For suitable plastics, this can involve sorting, cleaning, shredding, melting and reforming.
Many synthetic polymers are made using starting materials from finite crude oil or natural gas. Reusing polymer can reduce the amount of virgin polymer (new polymer made from raw materials) needed, conserving those resources and avoiding some extraction and processing.
Recycling can also reduce persistent waste sent to landfill or waste burned in incinerators. It can save money if useful recycled material costs less than virgin polymer and there is demand for the product. These benefits depend on the actual process and use, rather than on the word recycling alone.
Costs, energy and product quality
Different polymers may not mix well when melted. Food, labels and other contaminants can spoil the material, so sorting and cleaning add time, cost, energy and sometimes water use. Transport to a distant plant also uses fuel.
Heating and processing may damage polymer chains; contamination can further reduce quality. Recycled material may therefore suit a different or lower-value product, sometimes called downcycling. It still needs properties suitable for its new job.
Economic and environmental effects are separate: a financial loss does not by itself prove an environmental harm. Compare overall energy, emissions and resource use as well as cost. A buyer or useful application is needed if the recovered material is to replace new production.
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