Chloe Zhang
Plastic recycling is an essential part of creating a circular economy and reducing the environmental impact of plastic waste. While recycling efforts have been successful, there is still much room for improvement. The future of plastic recycling involves increasing recycling rates, adopting new technologies, and exploring alternative methods of plastic production.
Recent innovations, such as the development of infinitely recyclable plastics like poly(diketoenamine) (PDK), offer promising solutions to the waste crisis. Additionally, organizations like the Association of Plastic Recyclers (APR) are committed to improving recycling infrastructure, advocating for effective policies, and collaborating with industry partners to drive sustainable practices.
As we move forward, it is crucial to address the challenges posed by plastic waste and work towards a more sustainable future.
| Characteristics | Values |
|---|---|
| Current global plastic recycling rate | 9% |
| Current predominant approach to plastic waste recycling | Mechanical recycling |
| Alternative approaches to plastic waste recycling | Chemical recycling |
| Plastic recycling advocacy groups | Association of Plastic Recyclers (APR), Royal Society, Berkeley Lab |
| Goals of plastic recycling advocacy groups | To increase the amount of plastic recycled, ensure more plastic packaging is designed to be recycled, and strengthen market demand for using more recycled content in more product lines |
| Industries with the greatest potential for PDK use | Automobile industry, consumer electronics industry |
| Benefits of plastic recycling | Strengthening the domestic supply chain, reducing energy consumption, lowering greenhouse gas emissions, reducing the use of virgin materials derived from petrochemicals and fossil fuels, reducing waste, protecting the environment, strengthening the economy |
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What You'll Learn
- The future of plastic recycling is bright with the invention of poly(diketoenamine) (PDK)
- The Association of Plastic Recyclers (APR) is a leading voice in the industry
- Mechanical recycling is the predominant approach to plastic waste recycling
- The United Nations is working on a legally binding agreement to end plastic pollution
- The environmental impact of improperly discarded plastic is serious
The future of plastic recycling is bright with the invention of poly(diketoenamine) (PDK)
The future of plastic recycling is promising with the invention of poly(diketoenamine) (PDK). PDK is a polymer that can be recycled repeatedly without any loss in quality or performance. This is a significant improvement over traditional plastics, where only a small fraction is recycled, and even fewer are recycled more than once. PDK has all the convenient properties of traditional plastics but without the environmental drawbacks.
The development of PDK is a collaborative effort between researchers at the Molecular Foundry, the Joint BioEnergy Institute (JBEI), and the Advanced Light Source at the Department of Energy's Lawrence Berkeley National Laboratory. The team has successfully engineered microbes to produce biological alternatives to the starting ingredients in PDK. This process involves manipulating E. coli to convert sugars from plants into triacetic acid lactone (bioTAL), which can then be combined with other chemicals to create a biorenewable and recyclable PDK plastic.
One of the key advantages of PDK is its ability to be recycled indefinitely. When submerged in an acidic solution, the polymer breaks down into its original monomers, and the monomers can be easily separated from additives. This process does not degrade the properties or performance of PDK, making it a truly circular material. Additionally, PDK has a higher working temperature range than traditional plastics, expanding its potential applications in the automobile industry and beyond.
The economic and environmental benefits of PDK are also noteworthy. PDK-based plastic is expected to become commercially competitive with conventional plastics, and as production processes improve, it may even become cheaper and more sustainable. The use of bio-based alternatives can lead to reduced CO2 emissions and lower costs compared to fossil fuel-based plastics. Furthermore, PDK can be used in a variety of products, including adhesives, flexible items, building materials, and "tough thermosets."
Overall, the invention of PDK presents a bright future for plastic recycling. With its unique properties, PDK offers a sustainable and efficient alternative to traditional plastics. By adopting PDK, manufacturers can contribute to a more circular economy and play a crucial role in addressing the global plastic waste crisis.
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The Association of Plastic Recyclers (APR) is a leading voice in the industry
APR's Design for Recyclability Training Program helps companies design sustainable packaging and meet their environmental goals. They also offer Post-Consumer Resin (PCR) Certification, which helps companies meet legislative requirements, build customer confidence, and promote standardisation and trust across the supply chain.
APR is committed to improving the recycling process and has published the APR Design® Guide for Plastics Recyclability, which includes test methods to assess how packaging performs at each step of the sorting process required for full recycling. They also advocate for new policies and provide technical support for policy development and implementation. APR prioritises state-level policies and engages with key states through lobbying, meeting with elected officials, and submitting testimony.
APR recognises the importance of collaboration and innovation in driving the future of plastic recycling. They engage with leading Producer Responsibility Organisations (PROs) in Canada and participate in multi-stakeholder engagement processes to inform policy development. APR also collaborates with organisations like RecyClass to accelerate global alignment of Design for Recycling Guidance.
APR is committed to addressing the challenges posed by plastic waste and promoting the environmental and economic benefits of scaling plastic recycling, reduction, and reuse. They emphasise the need for state and federal policies to establish minimum recycled content standards to advance circularity in plastics.
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Mechanical recycling is the predominant approach to plastic waste recycling
Mechanical recycling is the most common method for recycling plastic waste. This process typically includes the collection, sorting, washing, and grinding of the material. The steps may differ in their order, frequency, or necessity depending on the waste's origins and composition. For instance, injection moulding runners are clean PI waste of a known composition, so they do not require collection, sorting, or washing. On the other hand, PC mixed plastics packaging waste, which is the broadest allowance of PC plastics waste, requires collecting, sorting, washing, and then grinding, often followed by regranulation.
Mechanical recycling is preferred because it closes the loop back to the secondary raw materials. The process typically leads to regranulation, while chemical recycling, the alternative, leads to monomer building blocks. Mechanical recycling also has the advantage of being able to handle large amounts of plastic waste, such as the over 5 billion pounds of post-consumer plastics processed by APR recycler members last year.
However, mechanical recycling does face some challenges, such as thermo-mechanical or lifetime degradation and the immiscibility of polymer blends. These issues are being addressed through the development of new practices and technologies. For example, the Association of Plastic Recyclers (APR) published a multi-material 2D/3D sorting potential test method to help brands and suppliers assess how packaging performs at each step of the sortation required for the full recycling process.
Mechanical recycling is also being complemented by chemical recycling in certain cases. For instance, the European Union has implemented stricter legislation, such as landfill bans and higher recycling targets, to promote industrial symbiosis and reduce plastic waste. This includes the Circular Economy Package, which aims to make it easier to dismantle, reuse, and recycle electronic displays.
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The United Nations is working on a legally binding agreement to end plastic pollution
Plastic recycling is an essential aspect of creating a circular economy and addressing the environmental issues caused by plastic packaging waste. The Association of Plastic Recyclers (APR) has been working towards improving plastic recycling for over 30 years. APR members have the capacity to more than double the recycling rate for certain plastics if they can increase the supply of plastic packaging for processing.
In recent news, the United Nations is working on a legally binding agreement to end plastic pollution. On March 2, 2022, the United Nations Environment Assembly (UNEA-5) in Nairobi endorsed a historic resolution to address the full lifecycle of plastic, including its production, design, and disposal. The resolution establishes an Intergovernmental Negotiating Committee (INC) that aims to develop a draft global legally binding agreement by the end of 2024. This agreement reflects the need for international collaboration to address the serious global environmental, social, economic, and health issues caused by plastic pollution.
The UN Environment Programme (UNEP) plans to convene a forum by the end of 2022, open to all stakeholders, to share knowledge and best practices from around the world. This forum will facilitate open discussions informed by science and will report on progress over the next two years. Upon completion of the INC's work, UNEP will hold a diplomatic conference to adopt the outcome and open it for signatures.
The resolution is based on three initial draft resolutions from various nations and has received support from several countries, including Japan, Rwanda, and Peru. The resolution demonstrates multilateral cooperation and a united effort to combat plastic pollution, including in the marine environment. This agreement holds significance in the campaign to beat plastic pollution and create a more sustainable future.
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The environmental impact of improperly discarded plastic is serious
The current plastic recycling rate is only 9%, and while recycling works, it could be more effective. The Association of Plastic Recyclers (APR) processed over 5 billion pounds of post-consumer plastics last year, and its members have the capacity to more than double the recycling rate for PET, HDPE, and PP if they can increase the supply of plastic packaging for processing. Recycling is essential to reducing waste and protecting the environment, and it also strengthens the domestic supply chain, reduces energy consumption, lowers greenhouse gas emissions, and replaces the use of virgin materials derived from petrochemicals and fossil fuels.
The future of plastic recycling looks promising, with innovations like poly(diketoenamine) (PDK), a new type of plastic that can be recycled indefinitely without any loss in quality. PDK-based plastic is expected to become commercially competitive with conventional plastics, and as production scales up, the products will become more affordable and sustainable. In addition to PDKs, there are also bio-based solutions and chemical recycling methods that can contribute to reducing the greenhouse gas emissions associated with plastic production.
To achieve a circular economy, it is crucial to increase plastic recycling rates and adopt innovative technologies and policies. The APR is committed to improving the recyclability of plastics through initiatives like the APR Design® Guide, which helps brands assess how their packaging performs at each step of the recycling process. By addressing the challenge of plastic waste and embracing sustainable practices, we can pave the way for a greener future.
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Frequently asked questions
The future of plastic recycling is promising, with advancements in technology and policy advocacy driving the industry forward. The development of infinitely recyclable plastics, such as poly(diketoenamine) (PDK), offers a sustainable alternative to traditional plastics, reducing environmental impact and improving recycling rates.
Infinitely recyclable plastics, like PDKs, can be recycled repeatedly without any loss in quality. This means that products made from PDKs can be recycled back into monomers and used to create new products, reducing waste and the need for virgin resins.
Infinitely recyclable plastics offer multiple benefits. They help reduce greenhouse gas emissions, strengthen domestic supply chains, lower energy consumption, and provide sustainable branding and long-term savings for companies.
One of the main challenges is increasing plastic recycling rates, which currently stand at 9% globally. Additionally, the proliferation of inexpensive virgin plastic often undermines the demand for recycled materials. Addressing these issues requires collaboration between governments, industries, and consumers, along with innovative solutions and supportive policies.
