Alexei Volkov
Plastic is a rapidly growing segment of municipal solid waste (MSW). While the amount of recycled plastics is relatively small, the recycling of some specific types of plastic containers is more significant. For example, the recycling rate of PET bottles and jars was 29.1% in 2018, and the rate for HDPE natural bottles was 29.3% in 2018. However, it's important to note that the recycling process for plastic can be energy and time-intensive, and there are concerns about the effectiveness of recycling in addressing the plastic pollution crisis. Some experts argue that a switch to systems of reuse and refill is necessary to combat plastic pollution effectively.
| Characteristics | Values |
|---|---|
| Percentage of plastic waste that has been recycled globally | 10% |
| Percentage of plastic waste that has been incinerated globally | 12% |
| Percentage of plastic waste in landfills globally | 78% |
| Percentage of plastic that is recyclable in the US | 5-6% |
| Percentage of plastic waste that is recycled in the US | 5-6% |
| Percentage of plastic waste that ends up in landfills in the US | 85% |
| Percentage of plastic waste that is incinerated in the US | 10% |
| Percentage of global plastic production that is thermoplastics | 75% |
| Percentage of global plastic production that is thermoset plastics | 25% |
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What You'll Learn
- Plastic recycling rates are low, with only 5-10% of plastic waste recycled globally
- Plastic waste often ends up in landfills and oceans, contributing to environmental pollution
- Thermoplastics and thermoset plastics have different recyclability due to their material properties
- Recycling plastic is challenging and expensive, requiring collection, sorting, and processing
- New recycling methods and refill/reuse schemes are being explored to address the plastic crisis
Plastic recycling rates are low, with only 5-10% of plastic waste recycled globally
Plastic recycling rates remain low, with only 5-10% of plastic waste recycled globally. This is due to a variety of reasons, including the complexity of plastics, the limitations of current recycling infrastructure, and the challenges posed by plastic pollution.
Firstly, plastics are chemically complex, with thousands of different additives used to create a wide range of plastic types with varying properties. These different types of plastics cannot be recycled together, and only a small fraction of plastic is truly recyclable. For example, a hard plastic detergent bottle and a squeezable ketchup bottle cannot be recycled together due to their different chemical compositions. This complexity often leads to consumer confusion, as many assume that the chasing arrows symbol on plastic packaging indicates recyclability. However, this symbol is often misleading, resulting in recycling plants being overwhelmed with non-recyclable plastic items.
Additionally, the current recycling infrastructure is fragmented and unevenly distributed. In some areas, there is a lack of machinery and facilities to efficiently select and recycle certain types of plastics. The market for recycled plastics is also underdeveloped, with recycled plastics still viewed as substitutes for virgin plastic. This makes it challenging for sellers of recycled plastic to find buyers, hindering the growth of the recycled plastic market. Furthermore, the cost of recycling plastic is often higher than creating new plastic from raw materials, creating a financial disincentive for recycling.
The plastic industry's continued expansion exacerbates the problem, with plastic production doubling from 2000 to 2019 to reach 460 million tonnes. The use of single-use plastics remains prevalent, and while bans and taxes on these products exist in over 120 countries, their impact on reducing overall plastic pollution is limited. Plastic waste generation has more than doubled from 2000 to 2019, reaching 353 million tonnes, with nearly two-thirds of this waste coming from plastics with lifetimes of under five years. The bulk of this waste ends up in landfills, is incinerated, or leaks into the environment, contributing to the growing plastic pollution crisis.
To address these issues, a multifaceted approach is necessary. This includes improving waste management infrastructure, particularly in low and middle-income countries, and implementing policies such as extended producer responsibility schemes and landfill taxes to reduce plastic waste and promote recycling. Additionally, curbing plastic production and consumption is crucial, with consumers playing a vital role in reducing their plastic usage and opting for reusable alternatives. While recycling is an important part of the solution, it is not sufficient on its own, and a combination of measures is needed to tackle the complex issue of low plastic recycling rates and the resulting environmental impact.
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Plastic waste often ends up in landfills and oceans, contributing to environmental pollution
Plastic waste is a pressing environmental issue, with a significant amount of plastic ending up in landfills and oceans. Only a small fraction of plastic is recyclable, and even when it is, not all of it gets recycled. The low recycling rates can be attributed to various factors, including the complexity of plastic types, inadequate waste management systems, and the cost of recycling compared to producing new plastic.
The plastic that doesn't get recycled ends up in landfills and oceans, contributing to environmental pollution. Landfills, particularly those in the Asian Pacific Region, are often overwhelmed by the sheer volume of waste they receive. For instance, Jakarta's largest landfill receives seven thousand metric tonnes of waste daily but can only process one-seventh of that amount. This leads to unprocessed waste building up in communities and eventually making its way into water pathways that lead to the ocean.
Once plastic waste enters the ocean, it becomes incredibly difficult to retrieve, especially once it breaks down into microplastics. These microplastics have been found in every corner of the globe, from Mount Everest to the Mariana Trench, and even in people. They affect marine ecosystems by impacting plankton, which are vital to ocean food chains.
The impact of plastic waste extends beyond the ocean, as toxic chemicals like Bisphenol A (BPA) can leach out of broken-down plastics, settling in oceans, soils, and groundwater. This directly affects water quality and agriculture, posing risks to human health. Additionally, individuals living near landfills are exposed to dangerous diseases and toxic chemicals that can leach into groundwater and soils.
To address plastic waste ending up in landfills and oceans, a multifaceted approach is necessary. This includes improving waste management systems, redesigning products for better recyclability, reducing single-use plastic manufacturing, and exploring innovative recycling techniques. Some companies are already implementing refill and reuse schemes, offering products in reusable containers, and turning organic waste into compost. While these initiatives are promising, a more widespread adoption and systemic changes are needed to tackle the global plastic pollution crisis effectively.
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Thermoplastics and thermoset plastics have different recyclability due to their material properties
Plastic recycling is a crucial step towards reducing our ecological footprint and protecting the environment. However, the reality is that only a small fraction of plastic waste is recycled globally, with less than 10% of plastic waste being recycled and about 91% of plastic not being recycled. The low recycling rate of plastics is due to various reasons, and one significant factor is the different recyclability of thermoplastics and thermoset plastics, which constitute around 75% and 25% of global plastics production, respectively.
Thermoplastics and thermoset plastics have distinct material properties that influence their recyclability. Thermoplastics, such as polyethylene and polypropylene, are characterized by their flexibility, toughness, and impact resistance. They are soft and malleable when heated, making them easy to mould and shape. This property also contributes to their high level of recyclability. Thermoplastics can be recycled multiple times without losing their properties, enhancing their environmental friendliness. They can be melted and reshaped into new plastics, making all thermoplastics, in theory, recyclable.
On the other hand, thermoset plastics, including epoxies, polyurethanes, and rubber used for tires, possess different characteristics. Thermoset plastics are designed to be strong, durable, and heat-resistant. When heated, they tend to burn instead of remoulding, making them challenging to recycle. The strong covalent bonds between their polymer molecules prevent them from returning to a liquid state once they have cooled and set in a particular shape. This cross-linked molecular structure limits their mouldability and recyclability, making them difficult to process and more expensive to recycle.
Despite the challenges posed by thermoset plastics, researchers at MIT have made significant progress in enhancing their recyclability. They have developed a method to modify thermoset plastics with a chemical linker, making them much easier to break down and recycle while retaining their mechanical strength. This innovation holds promise in improving the recyclability of thermoset plastics and reducing their environmental impact.
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Recycling plastic is challenging and expensive, requiring collection, sorting, and processing
Plastic recycling is a complex process that requires a lot of effort and coordination between different parties. The process typically begins with collection, followed by sorting and processing.
Collection is the first step in the plastic recycling journey. Collectors from the government or private companies gather all post-consumer plastic materials from various locations, such as homes, schools, and other institutions. Plastic bags are often used to separate plastic waste from regular waste in households. These bags are then collected and transported to sorting installations.
Sorting is a critical step in the plastic recycling process. It ensures the quality and safety of the new recycled plastic. Sorting can be done manually or by machines at recycling plants. Plastics are sorted based on several factors, including type, density, colour, size, shape, thickness, and usage. Infrared technology is often employed to separate different types of plastics accurately. Metals are also removed from the plastic during this stage. After sorting, the plastics are baled into compressed rectangular blocks and sold to recyclers, who will further process the material.
Processing recycled plastics involves multiple steps, including shredding, washing, melting, and forming new products. The sorted plastics are shredded into smaller pieces or flakes, which helps remove impurities such as labels, glue, dirt, and food scraps. The flakes are then washed thoroughly to ensure that any remaining contaminants are eliminated. After washing, the plastic is melted to form pallets called "nurdles," which can be transformed into new shapes to create recycled products.
Plastic recycling faces several challenges that contribute to its complexity and expense. Firstly, many products are designed in ways that make it difficult to separate and recycle plastic components. Different types of plastics may be combined, or plastics may be bonded with other materials such as glue or metal. Contamination is another significant issue, as non-recyclable plastics, food residue, chemicals, or adhesives can disrupt the recycling process and lead to increased costs. Additionally, the value of recyclable materials can fluctuate due to external factors like oil prices, material shortages, and economic conditions, impacting the cost-effectiveness of recycling.
Despite these challenges, there is a growing demand for recycled plastic as manufacturers shift towards sustainable practices. New technologies and processes are being developed to improve plastic recycling rates and increase the availability of recycled materials. For example, some companies are exploring refill and reuse schemes, while others are working on breaking down common consumer plastics to create bioplastics.
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New recycling methods and refill/reuse schemes are being explored to address the plastic crisis
Plastic recycling is an important step towards a more sustainable future and a healthier environment, economy, and health. However, the current global recycling rate for plastic is alarmingly low, with less than 10% of plastic waste being recycled. This has led to a surge in exploring new recycling methods and refill/reuse schemes to address the plastic crisis.
One promising technique involves processing polypropylene and polyethylene into propane, as described in a 2020 study by MIT researcher Julie Rorrer. Another method, detailed in a 2020 Science publication, can break down common consumer plastics and reform them into bioplastics with the help of an engineered soil bacterium. French biotechnology company Carbios is working on a similar approach, aiming to recycle PET using an engineered enzyme. This type of recycling is theoretically more circular as it doesn't require the high heat that often leads to degradation in recycled plastics.
In addition to these innovative recycling methods, refill and reuse schemes are gaining traction worldwide. For example, the company Algramo in Chile offers various liquid products like shampoo and laundry detergent in reusable plastic bottles through a network of filling stations. They aim to eliminate the "poverty tax" by charging the same unit price regardless of volume. Refill, a UK-based organization, has developed an app that connects users to places where they can reduce, reuse, and refill their everyday items, helping them cut down on single-use plastic. Their campaign has influenced behaviour changes, with 75% of app users significantly reducing their plastic usage.
Community-led initiatives are also making an impact. Nipe Fagio in Tanzania manages waste and recycling systems, reducing landfill waste by 75-80% in several cities. Extended Producer Responsibility (EPR) plans are being considered to fund such programs and address the management of plastic bottles and packaging after their initial use. Additionally, countries like Indonesia are witnessing game-changing reuse ventures, such as digital apps that enhance refill convenience.
To further accelerate progress, Greenpeace International calls for a global plastics treaty, urging governments and big brands to reduce plastic packaging, invest in refill and reuse, and prioritize policy changes. With these new recycling methods and refill/reuse schemes, there is hope for a more sustainable future, but widespread implementation and policy support are crucial to effectively tackling the plastic crisis.
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Frequently asked questions
In 2018, the US recycled three million tons of plastic, which equates to an 8.7% recycling rate. However, other sources state that only 5-6% of plastic is recycled in the US.
In 2018, 27 million tons of plastic ended up in landfills in the US, which was 18.5% of all municipal solid waste (MSW) landfilled.
Plastic is difficult to recycle because there are thousands of different types that cannot be recycled together. The only exception is plastics labelled 1 and 2, such as clear drinking bottles, milk jugs, and some food packaging. When plastic is recycled improperly, it can end up in landfills, water sources, and even human bodies.
One solution is for consumers to reduce their plastic consumption by avoiding products packaged in plastic and seeking out stores that offer product refills in reusable containers. Some companies, such as Algramo, founded in Chile in 2013, allow customers to buy liquid products in reusable plastic bottles from a network of filling stations. Another solution is for governments to implement extended producer responsibility (EPR) plans, which require producers of plastic bottles and packaging to provide funding to support the management of these materials after their initial use.
