Omar Khalid
Plastic is one of the most popular and useful materials of modern times, with 300 million tonnes of plastic produced annually. However, the disposal of plastic waste has become a critical environmental concern, with the majority of plastic waste ending up in landfills, oceans, or other non-environmentally friendly destinations. While almost all plastic can be recycled in theory, various economic, environmental, and technical barriers exist in practice. Sorting and collecting plastic waste can be expensive, and some types of plastic are difficult to recycle. For instance, thin bags or films can clog recycling machinery if not separated properly, and items made from multiple types of plastic with different layers can be hard to separate and costly to recycle. Additionally, some types of plastic, such as bioplastics and composite plastic, are not recyclable. Despite these challenges, new recycling methods and refill-and-reuse schemes are being explored, and recycling rates have been increasing in most countries.
| Characteristics | Values |
|---|---|
| Number of plastic types | 7 |
| Plastic resin codes | 1-7, with 7 being 'other' |
| Types of recycling | Mechanical recycling, chemical recycling |
| Mechanical recycling process | Plastic is washed, ground, and melted |
| Chemical recycling process | Plastic is broken down into monomers to form new polymers |
| Plastic types that are easy to recycle | PET, HDPE |
| Recycling rate for HDPE bottles in the US | 30% |
| Recycled PP use cases | Plastic lumbers, park benches, auto parts, speed bumps |
| Plastic types never recycled | 6 and 7 |
| Plastic recycling rate threshold | 30% |
| Plastic types that are hard to recycle | Crisp packets, salad bags, plastic wrap |
| Types of plastic that are not recyclable | Bioplastics, composite plastic, plastic-coated wrapping paper, polycarbonate |
| Recycled plastic use cases | Construction material in third-world countries |
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What You'll Learn
Plastic resin codes indicate recyclability
Plastic resin codes, also known as Resin Identification Codes (RIC), are a set of symbols that appear on plastic products to identify the type of plastic resin used to make the product. They were developed in 1988 by the Society of the Plastics Industry (now the Plastics Industry Association) in the United States and have been administered by ASTM International, an international standards organisation, since 2008. The RIC system uses numbers ranging from 1 to 7, with 7 being 'other', to indicate different types of plastic. These numbers are enclosed within a triangle, which is often mistaken for the universal recycling symbol due to their resemblance.
The RIC system was designed to aid workers in materials recovery and recycling facilities to sort and separate items according to their resin type. Different types of plastic must be recycled separately to preserve the value of the recycled material and enable its reuse. The lower the resin code, the more likely the plastic type is easily recyclable. For example, plastics with RICs "1" and "2" (polyethylene terephthalate and high-density polyethylene, respectively) are widely recycled, while plastics with RICs "6" and "7" are never recycled.
In addition to the RIC system, there are "How2Recycle" labels that indicate the recyclability of a plastic product based on the percentage of the population that can recycle it through a curbside recycling program or municipal drop-off location. These labels are: "Widely Recycled" (greater than 60%), "Limited" (20-60%), "Not Yet Recycled" (less than 20%), and "Store Drop-Off" (can be recycled at participating store drop-off locations).
It is important to note that the presence of a RIC symbol on a plastic product does not necessarily indicate that it is recyclable, and the absence of the symbol does not mean that the product is unrecyclable. The RIC system simply identifies the type of plastic resin used, and recyclability depends on the capabilities of local recycling facilities.
Overall, plastic resin codes provide valuable information about the type of plastic and can help consumers make more informed choices about their packaging options and recyclability.
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Plastic bottles are recycled into flakes, yarn, or new bottles
Plastic bottles are one of the most prolific items thrown into recycling bins. However, despite their ubiquity, plastic bottles, along with other plastics, are not often recycled. This is due to a variety of reasons, including the high cost of collecting and sorting the plastic, the presence of multiple types of plastic in a single item, and the fact that plastic cannot be economically recycled. In fact, a Greenpeace report found that almost none of the plastic placed in recycling bins is actually recycled, with most of it ending up in landfills.
Despite these challenges, recycled plastic bottles can be transformed into flakes, yarn, or new bottles. The recycling process for plastic bottles typically involves several steps, including cleaning, shredding, melting, extrusion, and spinning. Firstly, the bottles are sorted by type and colour, cleaned, and shredded into small plastic flakes. These flakes are then melted down into a liquid form, which is extruded through spinnerets to produce continuous strands of plastic fibres. The resulting filaments are then spun into yarn, which can be used for various applications, including textiles and industrial products.
The recycled yarn produced from this process can be used in textile production, where it is woven or knitted into fabrics for clothing, rugs, and other fabric items. It is also used in the fashion industry, with recycled polyester clothing becoming increasingly popular among designers and brands due to its sustainability and durability. In addition to yarn, the plastic flakes can also be melted down into pellets and then extruded into new plastic bottles.
Recycling plastic bottles into flakes, yarn, or new bottles offers several benefits. It helps to reduce plastic pollution and waste, conserve resources, and lower energy consumption and carbon emissions. Additionally, it supports the creation of sustainable products, contributing to a more environmentally and economically beneficial future.
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Plastic bags and wrappings are now more widely recycled
Plastic bags and wrappings can be recycled, but they are not accepted by most curbside recycling programs. This is because they can clog machines and get tangled in recycling equipment, requiring workers to shut down the machinery and remove the plastic. However, there are still ways to recycle plastic bags and wrappings.
Many retail stores and drop-off centers accept plastic bags and wrappings for recycling. These include large grocery stores and other retailers, which may have collection bins outside or inside their stores. It is important to ensure that the materials are clean and dry before dropping them off, as wet or dirty plastic can disrupt the recycling process. Some non-recyclable plastic wraps include those that contained frozen food, pre-washed salad mix bags, and bags labeled as degradable, compostable, or biodegradable.
Additionally, plastic bags and wrappings can be reused multiple times before disposal. For example, old plastic bags can be reused for multiple shopping trips or repurposed as trash liners or pet waste bags. By reducing, reusing, and recycling plastic bags and wrappings, individuals can help lessen the negative environmental impacts associated with these materials, such as greenhouse gas emissions and pollution during the production process.
While plastic bags and wrappings may not be accepted by all recycling programs, the good news is that recycling rates for plastic materials have been increasing in almost every country. With continued efforts to improve recycling technologies and infrastructure, it is hoped that plastic recycling will become an even more widely adopted solution for plastic disposal.
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Low reprocessing rates despite oil and gas industry plans
Plastic waste is a critical concern for environmentalists, governments, and organizations, as the majority of plastics are disposed of in non-environmentally friendly ways, leading to polluted oceans, overfilled landfills, and ecological damage. While recycling is a crucial solution to this problem, the rates of reprocessing plastics remain low despite plans and efforts by the oil and gas industry to improve sustainability.
The low reprocessing rates of plastics can be attributed to various factors. Firstly, the complexity of plastics poses challenges. Many plastic items consist of multiple types of plastic and different layers, making separation difficult and costly. This complexity often renders such products non-recyclable. Additionally, certain types of plastics, such as crisp packets, salad bags, and plastic wrap, are incredibly challenging to recycle due to their material composition.
Another factor contributing to low reprocessing rates is the economic and technical considerations surrounding plastic recycling. In some cases, recycling may not always be environmentally, economically, or technically feasible. For instance, thin bags or films can clog recycling machines if not separated properly, leading to their exclusion from kerbside collections. Moreover, recycled plastics may not always be suitable for certain applications, such as packaging, due to aesthetic considerations like color.
The oil and gas industry has recognized the need to transition towards more sustainable practices and has taken steps to address the issue of plastic waste. Some companies within the industry are investing in low-carbon technology projects to balance the risks associated with traditional oil and gas markets. These investments position these companies favorably for the future energy landscape, which is increasingly focused on clean energy adoption.
Despite these efforts, the plastic recycling landscape continues to face challenges. Recycling rates for plastics, while improving, still lag behind those of other materials such as aluminum and glass. To address this, global policymakers, innovators, and companies are exploring alternatives to reduce plastic production and promote circularity, which involves extending the lifespan of products and finding new ways to reuse materials.
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Plastic recycling is critical to environmental improvement
Plastic recycling is critical to improving the environment and bettering waste management solutions. Humans have created around 11 billion metric tons of plastic, surpassing the biomass of all animals on Earth. With only 9% of global plastic recycled, the vast majority of plastic waste is disposed of in non-environmentally friendly ways, resulting in polluted oceans, overextended landfills, and ecological damage.
The environmental impact of plastic waste is startling, with microplastics found in the ocean, snow and rainfall in seemingly pristine places, the air we breathe, and even in human blood and breast milk. To address plastic pollution, we need to develop better, more recyclable products, find sustainable alternatives, and increase circularity by keeping products in use for longer and finding ways to reuse their materials.
One way to improve the environmental performance of the polymer industry is to recycle a wider range of post-consumer plastic packaging and waste plastics from consumer goods. This will enable higher recovery rates of plastic waste and diversion from landfills. Recycling can also decrease energy and material usage per unit of output, yielding improved eco-efficiency. For example, recycled PP is used in plastic lumbers, park benches, auto parts, and speed bumps, while recycled PET is increasingly being used as a construction material in third-world countries.
However, there are challenges to plastic recycling. Many plastic products are complex mixtures of different types of plastic, making them difficult and costly to separate and recycle. Additionally, some types of plastic, such as bioplastics, composite plastic, and plastic-coated wrapping paper, are incredibly hard to recycle. Furthermore, the current low global recycling rates are due to the neglect of thermoset plastics, which form irreversible chemical bonds and cannot be recycled, in favour of thermoplastics.
Despite these challenges, plastic recycling remains one of the most important actions to reduce the environmental impacts of plastic production and improve sustainability. With a coordinated global effort and the exploration of advanced methods, we can fully unlock the potential of plastic recycling to contribute to environmental improvement.
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Frequently asked questions
There are two main ways to recycle plastic: mechanical recycling and chemical recycling. Mechanical recycling involves washing, grounding, and melting plastic, while chemical recycling breaks down plastic into monomers to form new polymers.
Plastic waste is a key concern for environmentalists, governments, and organizations as improper disposal leads to polluted oceans, overextended landfills, and ecological damage. Recycling plastic is critical to improving the environment and bettering waste management solutions.
There are several challenges to recycling plastic. Firstly, plastic is not designed to be recycled and its quality diminishes with each attempt. Secondly, recycling plastic is expensive, particularly the processes of collecting, sorting, and reprocessing. Additionally, there are various types of plastic, and they cannot be melted down together, making it difficult and costly to recycle.
Plastic bottles are usually made from two types of plastic that are easy to recycle: PET and HDPE. PET is often blended with virgin recycled material to give strength to the recycled product. HDPE is accepted at most recycling centers worldwide and has a recycling rate of around 30% in the US.
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