Omar Khalid
Plastic is everywhere, and it's bad for the waste it creates. Plastic production has exploded over the last half-century, growing from 16.5 million tons in 1964 to 343 million tons in 2014, and it is projected to double by 2036. Plastic can take anywhere from 20 to 500 years to decompose, depending on the material and structure, and even then, it never fully disappears; it just gets smaller and smaller. Recycling plastic is the best solution to limit its exposure to the environment. However, the plastic recycling process is fraught with flaws. In this article, we will explore what it takes to recycle plastic and the challenges involved.
| Characteristics | Values |
|---|---|
| Purpose | To limit plastic's exposure to the environment |
| Plastic decomposition time | 20 to 500 years |
| Plastic recycling start | Conshohocken, Pennsylvania |
| Plastic recycling mill opening year | 1972 |
| Plastic production growth | From 16.5 million tons in 1964 to 343 million tons in 2014 |
| Plastic recycled in 2014 | 9.5% |
| Plastic decomposition by-product | Microplastics |
| Plastic recycling process | Multistep |
| Plastic recycling challenges | Dyes used in creating plastic products can be contaminated |
| Plastic recycling impact | Reduces the consumption of other natural resources |
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What You'll Learn
The history of plastic recycling
However, it wasn't until the 1980s that plastic recycling became more prevalent, with the adoption of PETE and HDPE plastic, which were designed with recycling in mind. During this time, there was a growing concern about the amount of plastic waste being generated, and recycling programs were established to collect and recycle plastic waste, reducing the amount of plastic in landfills and the environment. In 1984, an astonishing 100 million pounds of plastic was gathered nationwide in the US, a milestone in the history of plastic recycling. In 1988, the closed-loop triangular symbol to identify plastic resin in packaging was adopted and quickly became a popular symbol for recycling.
The 1990s saw a continuation of these trends, with recycling becoming an ever-more important factor in how people disposed of their waste. Woodbury, New Jersey, became the first city in the US to mandate recycling in 1981. The 21st century has seen a growing number of warehouses and distribution centers cashing in on the financial and environmental benefits of recycling.
Despite these advancements, plastic recycling rates lag behind those of other recoverable materials such as aluminium, glass, and paper. From the start of plastic production through to 2015, only 9% of the world's plastic waste had been recycled, with only ~1% recycled more than once. The process of recycling plastic is also more complicated than that of other materials, and the cost of recycling can be higher than the cost of producing new plastic.
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The plastic recycling process
Plastic recycling is a multistep process that involves turning plastic waste into other plastic products of similar quality. The process helps reduce waste and ensures that valuable resources are converted into new products instead of being wasted after just one use.
Chemical recycling, on the other hand, uses a combination of heat, pressure, and other chemicals to break down old plastics to create fuel or chemicals. This method can process a wide variety of plastic types and divert plastic waste from landfills. However, it does not currently provide an alternative to creating new plastic from raw materials, and most methods are only useful in theory rather than on an industrial scale.
The pursuit of plastic recycling has been a long journey. The idea of repurposing and reusing products is not new, and the concept has been around for thousands of years. However, it wasn't until the 1960s that society began to take action against the ever-increasing amounts of waste created by non-biodegradable disposable plastic packaging. America's first plastic recycling mill opened in 1972 in Conshohocken, Pennsylvania, and it took several years for citizens to embrace the recycling habit.
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Barriers to plastic recycling
Plastic recycling is a complex process that involves multiple steps and challenges. Despite its significance in reducing waste and conserving resources, several barriers hinder the effectiveness of plastic recycling.
One of the primary barriers is the lack of consumer awareness and knowledge about plastic recycling. Many consumers are unsure about what can and cannot be recycled, leading to contamination of recyclable materials with non-recyclable items such as liquids or plastic bags. This lack of understanding results in consumers throwing everything away instead of recycling. Additionally, the presence of microplastics, which are tiny particles resulting from the breakdown of larger plastic pieces, further complicates the recycling process and poses risks to marine life and the environment.
Another significant barrier is the complexity of plastic as a material. Plastic encompasses hundreds of different types of materials, each with unique properties affecting their colour, shape, structure, and melting point. This diversity in plastic types makes sorting and categorisation crucial to maintain purity in the recycling process. However, different types of plastic are often combined in manufacturing, making recycling more challenging. Additionally, some plastics are difficult to separate from other materials, such as glue or metal, that are bonded or fixed to them.
The recycling industry also faces economic challenges. Virgin raw materials, or "virgin plastics," are sometimes cheaper than recycled materials, creating a financial disincentive for manufacturers to utilise recycled plastic. This is particularly prominent during periods of decreased oil prices, as oil is a key component in the production of virgin plastics. Furthermore, the recycling industry itself faces safety risks and labour issues, deterring potential workers from joining the field.
Lastly, the process of recycling plastic does not inherently reduce the need for virgin plastic production. While recycling can decrease the consumption of other natural resources, such as timber, it does not directly address the issue of virgin plastic creation. This means that even with increased recycling efforts, the demand for virgin plastics may remain high, perpetuating the environmental issues associated with their production and disposal.
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Innovations in plastic recycling
Plastic recycling plays a crucial role in mitigating the environmental impact of plastic waste, reducing the consumption of other natural resources, and decreasing dependence on virgin plastic production. While the concept of plastic recycling is not new, with the first plastic recycling mill opening in 1972, it has gained prominence in recent years due to the increasing awareness of the negative consequences of plastic waste.
- Mechanical and Chemical Recycling: Mechanical recycling and chemical recycling are innovative methods that enable the efficient processing of plastic waste into high-quality recycled materials. Mechanical recycling involves physical processes such as sorting, shredding, and melting plastic waste to create new products. On the other hand, chemical recycling uses chemical processes to break down and reform plastic polymers. Solvent-based recycling, for instance, dissolves plastic waste in solvents to extract valuable components and recover high-quality polymers and additives. Hydrothermal processing treats plastic waste in hot pressurized water or steam, converting it into useful chemicals.
- Upcycling and Downcycling: Upcycling and downcycling are innovative approaches that contribute to the circular economy by extending the lifespan of plastic materials. Upcycling involves creatively transforming plastic waste into products of higher value or quality, such as using plastic bottles to create innovative furniture or fashion accessories. Downcycling, on the other hand, converts plastic waste into lower-value products, such as plastic lumber or fiber. Both methods help reduce the demand for virgin plastics and minimize waste generation.
- Closed-Loop Recycling Systems: Some manufacturing plants have implemented closed-loop recycling systems, where plastic waste generated during production is collected, processed, and reused as raw materials. This approach significantly reduces waste disposal costs and environmental impact, as it minimizes the need for new plastic production and reduces plastic waste sent to landfills.
- Advanced Sorting Techniques and Technologies: Innovative recycling facilities are emerging, equipped with state-of-the-art machinery and technologies. These facilities incorporate advanced sorting techniques, enhanced plastic conversion technologies, and digital solutions to optimize the recycling process. These technologies help improve the efficiency and accuracy of sorting different types of plastics, which is crucial for producing high-quality recycled materials.
- Enzymatic Recycling and Biodegradable Additives: Enzymatic recycling and biodegradable additives are innovative methods that hold significant potential for enhancing the efficiency and sustainability of plastic recycling. Enzymatic recycling uses enzymes to break down plastic polymers, while biodegradable additives help make plastics more susceptible to degradation, reducing their environmental persistence.
- Plastic-Eating Bacteria: The discovery of plastic-eating bacteria is a recent innovation in the fight against plastic waste. Researchers found a species of bacteria at a dumpsite that uses plastic as food and can survive the toxic chemicals released during the breakdown process. This discovery opens up new possibilities for naturally degrading plastic waste and reducing its environmental impact.
While these innovations show promise, it is essential to acknowledge that the effectiveness of plastic recycling also relies on consumer participation and responsible waste management practices. Increasing public awareness, improving recycling infrastructure, and implementing supportive legislation are crucial steps toward achieving a more sustainable future for plastic waste management.
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The future of plastic recycling
Plastic recycling is an important topic, as plastic waste is everywhere, polluting our planet. Plastic production has exploded over the last half-century, growing from 16.5 million tons in 1964 to 343 million tons in 2014, and it is projected to double by 2036.
To improve the future of plastic recycling, researchers are testing new technologies to effectively recycle plastic. For example, scientists at the University of Michigan have discovered a way to break down PVC, a previously unrecyclable plastic, without adding heat, using an electrochemical technique. This method controls the rate of hydrochloric acid production, which is toxic. Another technology from the University of Texas focuses on PET, a commonly recycled plastic.
Public awareness and action are crucial in the fight against plastic waste. Individuals can reduce their plastic consumption, reuse plastic products, and recycle whenever possible. By embracing these habits, we can work towards a future where plastic pollution is minimized, and our planet is healthier and safer.
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Frequently asked questions
Plastic can take anywhere from 20 to 500 years to decompose, and even then, it never fully disappears; it just gets smaller and smaller. Plastic pollution has become a significant issue, with plastic debris floating in the oceans and threatening the health and safety of marine life. Recycling plastic can help limit its exposure to the environment.
Mechanical plastic recycling is a multi-step process that turns plastic waste into other plastic products of similar quality. This creates a closed material loop, minimising waste and the extraction of new natural resources. Chemical recycling, on the other hand, uses heat, pressure, and chemicals to break down old plastics to create fuel or chemicals.
Mechanical recycling can be flawed due to contaminated dyes used in creating plastic products, and it is more expensive and less economical than creating new plastic. Chemical recycling, while attractive as an alternative, currently does not offer a sustainable solution due to its reliance on petrochemicals from fossil fuel extraction.
Researchers are constantly working on new technologies to recycle plastic effectively. For example, scientists at the University of Michigan have developed an electrochemical technique to recycle PVC without generating toxic chemicals. Additionally, the discovery of plastic-eating bacteria at a dumpsite offers another potential solution.
Individuals can play a crucial role in reducing plastic waste by reusing plastic items whenever possible, such as bringing their own containers for takeaway food and drinks. It's also important to recycle plastic properly by sorting and separating different types of plastic. Educating others and raising awareness about the impact of plastic waste can also help create a more sustainable future.
