Chloe Zhang
Plastic recycling is a complex process that involves multiple steps and organisations. Once plastic is placed in a recycling bin, it is collected and transported to Material Recovery Facilities (MRFs) or Plastic Recovery Facilities (PRFs). At these facilities, plastic is sorted, shredded, and melted down to be recycled. However, it is important to note that not all plastic placed in recycling bins is actually recycled. A significant portion ends up in landfills or the environment, contributing to plastic pollution. The recycling process is expensive, and with the low cost of producing new plastic, there is little incentive to utilise recycled materials. Additionally, the variety of plastic types and their degradation after a few uses further complicate the recycling process. Despite these challenges, some places, like Oregon and Michigan, have successfully implemented bottle bills that encourage customers to return plastic bottles for recycling.
| Characteristics | Values |
|---|---|
| Plastic recycling process | Plastic waste is collected from homes, businesses, and recycling centers and sent to Material Recovery Facilities (MRF) which separate plastic from non-plastic. The plastic is then sent to Plastic Recovery Facilities (PRF) for sorting into different types of plastic. |
| Sorting techniques | Manual picking, trommels (cylindrical drums with holes), optical sorters, NIR sensors, sink/float separators, and vibratory feeders. |
| Plastic's fate | Most plastic ends up in landfills or the environment, with only 9% of all plastic ever produced being recycled and 19% incinerated. |
| Plastic pollution | The transportation of plastic contributes to pollution as it easily escapes and enters the environment, breaking apart into particles that can be ingested or inhaled. |
| Industry influence | Oil and plastic companies have promoted recycling and cleanup efforts, but have been accused of misleading the public about the effectiveness of plastic recycling. |
| Challenges | Plastic is expensive to collect and sort, there are thousands of types that cannot be melted down together, and it degrades after one or two uses. |
| Solutions | Environmentalists advocate for legislation banning single-use plastics and "bottle bills" that incentivize returning plastic bottles. |
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What You'll Learn
Plastic is rarely recycled and often ends up in landfills
Plastic is notoriously difficult to recycle, and despite public efforts to dispose of plastic waste responsibly, most plastic ends up in landfills.
Although many people put their plastic waste into recycling bins, the vast majority of this plastic is still headed to landfills. A 2022 Greenpeace report found that only 5% of plastics are recycled, with the rest going to landfill or entering the oceans. This is due in part to the lack of capacity for recycling various plastics. There are now thousands of different types of plastic, and none of them can be melted down together. Plastic also degrades after one or two uses, and the more it is reused, the more toxic it becomes.
Another issue is that plastic with food residues usually cannot be recycled. Only good-quality, clean plastics can go through the recycling process. Sometimes a recycling factory will wash plastic items, but most of the time, they are deemed useless and thrown in a landfill or an incinerator.
The low recycling rate for plastic is also due to economic factors. Plastic waste has little value, so there is no financial incentive to collect it, especially from isolated locations. It is cheaper to produce new plastic than to collect, recycle, or reuse existing plastic. The plastic industry is also ramping up production, with plans to triple production by 2050, and plastic is cheap and easy to produce.
Finally, there is the issue of plastic waste management, especially in low- and middle-income countries, where formal recycling programs are rare. An estimated two billion people worldwide lack access to regular waste management services, and most of the plastic that ends up in the ocean comes from areas with inadequate waste management.
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Plastic is expensive to collect, sort and recycle
Plastic recycling is a complex and challenging process. It involves multiple steps, each with its own set of costs and challenges. The first step is collecting plastic waste, which can be done through various means such as curbside pickup, recycling centres, or waste pickers. However, collecting plastic waste can be expensive, especially when it comes to transporting it to sorting facilities.
Once the plastic waste is collected, it needs to be sorted. Sorting plastic is a labour-intensive and time-consuming process, as there are thousands of different types of plastic that need to be separated. This step is crucial because different types of plastic cannot be melted down together. The sorting process can be done manually or with the help of technology, such as optical sorters or NIR sensors. However, it is important to note that even with advanced technology, the sorting process can still be challenging and expensive.
After sorting, the plastic is washed, shredded, and further processed into smaller pieces or granules. This step ensures that impurities are removed and the plastic is ready to be recycled into new products. However, it is important to mention that not all plastic can be recycled, and some may end up in landfills despite being labelled as "recycling".
The recycling process itself involves melting and extruding the plastic into new forms. This step can also be costly, as it requires specialised equipment and facilities. Additionally, plastic degrades after one or two uses, making it challenging to reuse. The recycled plastic then needs to be transported and marketed, which can be difficult as there are few markets for plastic trash.
Overall, the high costs and challenges associated with collecting, sorting, and recycling plastic have led to a crisis in the industry. Despite efforts to improve recycling rates, the production of new plastic remains cheaper and easier than recycling existing plastic. This has resulted in a situation where most plastic ends up in landfills, contributing to environmental degradation and pollution.
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Plastic degrades after one or two uses
Plastic is a human-made material that has revolutionized the way we live. However, it also presents a significant challenge: its persistence in the environment. Plastic is designed to be durable, but this very feature makes it resistant to breakdown processes, leading to plastic waste accumulation.
The issue is twofold: the rapid generation of plastic waste and the slow degradation rate of plastic materials. Firstly, plastic waste is currently produced at an alarming rate, approaching 400 million metric tons per year. This waste primarily ends up in landfills, despite public efforts to recycle. Recycling plastic is challenging due to the variety of plastic types, the expense of collection and sorting, and the lack of effective recycling infrastructure.
Secondly, plastic degrades very slowly, with some plastic items taking hundreds of years to break down. For example, plastic water bottles made with polyethylene terephthalate (PET) can take approximately 450 years to fully decompose. Even when plastic does break down, it can release toxic chemicals and microplastics into the environment, causing further ecological harm.
The slow degradation of plastic has far-reaching consequences. Plastic waste accumulates in landfills, oceans, and other natural environments, leading to pollution and ecological damage. It can take 20 years for a plastic bag to degrade in the ocean, during which time it can release toxic chemicals and microplastics that harm marine life and enter our food chain when we eat, drink, and breathe.
While some innovations, such as plant-based plastics and plastic-eating bacteria, offer hope for more rapid and eco-friendly degradation, the core issue of excessive plastic waste generation remains. Reducing plastic waste, improving recycling infrastructure, and transitioning to reusable systems are crucial steps towards addressing the plastic crisis.
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Plastic is often shipped overseas for recycling
The plastic waste trade has significant environmental and health implications. Waste haulers frequently engage in illegal open burning of plastics, exposing nearby communities to toxic fumes and pollutants. Even when plastic waste is successfully recycled, the process of sorting, transporting, and recycling plastic contributes to pollution as plastic easily escapes during transportation and breaks apart into harmful particles that enter our bodies and the environment.
The plastic recycling process begins with collection from homes, businesses, and recycling centers, which send the plastic to Material Recovery Facilities (MRFs) that separate plastic from non-plastic materials. The plastic then goes to Plastic Recovery Facilities (PRFs) for sorting into different types. The sorted plastic is shredded, washed, and melted before being sold to a processor and ultimately a manufacturer. However, the recycling process is complex and expensive, and the resulting recycled plastic is often of lower quality and higher cost than virgin plastic, making it less desirable.
To address the issues with the plastic waste trade, 187 countries agreed in 2019 to restrict international trade in plastic scrap and waste under the Basel Convention. This treaty controls transboundary shipments of plastic waste and requires the prior written consent of importing and transit countries. Despite these efforts, the plastic waste crisis persists, and drastic changes are needed to reduce plastic production and improve waste management practices, especially in high-income countries.
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Plastic is hard to recycle due to thousands of different types
Plastic is notoriously difficult to recycle, and the problem is only getting worse. While many commonly used plastics can theoretically be recycled, in reality, only a tiny fraction of plastic is recycled even once, and a minuscule amount twice. The issue is that there are thousands of different types of plastic, and they cannot be melted down together.
When plastic is collected for recycling, it is sent to a Material Recovery Facility (MRF) to be separated from non-plastic materials. From there, it goes to a Plastic Recovery Facility (PRF) to be sorted into different types of plastic. This sorting is done by hand or with the help of technology such as NIR sensors, which can identify plastic types through their absorption of light. The plastic is then shredded and washed, before being melted down and formed into pellets to be sold to producers of recycled plastic products.
However, different types of plastic do not mix well when melted down, and small amounts of the wrong type can degrade the quality of the whole batch. This means that careful sorting is required, which is an expensive and time-consuming process. Even with diligent sorting, recycled plastic is almost always of lower quality than primary plastic.
The long polymer chains that make up plastics become slightly shorter each time they are melted down, and the more plastic is reused, the more toxic it becomes. This means that recycled plastic usually amounts to downcycling, creating products of lesser technical and aesthetic quality. Furthermore, the market is fragmented, making it difficult for sellers of recycled plastic to find buyers.
The result is that despite people's best efforts to recycle plastic, most of it ends up in landfills or is incinerated. Even when placed in recycling bins, plastic often does not get recycled and is instead sent to a landfill in a different location. Plastic waste is also often shipped from the Global North to the Global South, where it is illegally dumped or burned, causing major health and environmental issues for those living nearby.
The plastic industry depends on non-renewable resources, and plastic production is energy-intensive and contributes to greenhouse gas emissions. With plastic production set to triple by 2050, the crisis will continue to worsen without drastic change.
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Frequently asked questions
Plastic is picked up by recycling centers and sent to Material Recovery Facilities (MRFs) or Plastic Recovery Facilities (PRFs) for sorting and processing. However, it is important to note that most plastic items collected for recycling are not actually recycled and often end up in landfills or the environment.
At the MRFs or PRFs, plastic is sorted by type using various techniques such as manual picking, optical sorters, or sink/float separators. It is then shredded, washed, and further sorted before being melted and extruded for repurposing.
Recycling plastic is challenging and expensive due to the thousands of different types of plastic that cannot be melted down together. Plastic also degrades after one or two uses, making it difficult to reuse. Additionally, the production of new plastic is cheaper and easier than recycling.
The transportation and processing of plastic contribute to plastic pollution as plastic easily escapes and breaks apart into microplastics that enter our environment and ecosystems. These microplastics are then ingested by humans and animals, leading to potential health risks.
Environmentalists advocate for a "circularity revolution" in plastic recycling, including scaling up sorting technologies, advanced recycling methods, and promoting systems of reuse and refill. Legislation banning single-use plastics and incentivizing plastic bottle returns through "bottle bills" has also proven successful in some states.
