Sofia Martinez
Plastic is everywhere, and it's designed to last. Since 1907, nearly all plastics ever created still exist in some form today. This is because plastic does not decompose like organic material, and bacteria cannot break it down. However, plastic can be broken down by a process called photodegradation, where UV rays from the sun break the bonds holding the molecular chain together. This process happens faster in the ocean, but it causes significant harm to marine life as microplastics are often mistaken for food. While recycling is an option, it is not a perfect solution as it can be a complex and energy-intensive process that may release toxic fumes. Biodegradable plastics are an alternative, but they are not a cure-all, as they often require industrial composting facilities to break down effectively.
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What You'll Learn
Plastic-eating bacteria
Plastic is not a material that decomposes easily. It is designed to last for decades, if not hundreds of years. The decomposition of plastic is influenced by factors such as the material's structure and environmental factors like sunlight exposure.
Traditional plastic bottles are made of polyethylene terephthalate (PET), a lightweight and flexible material that does not decompose easily because bacteria cannot break down the chemicals used in its composition. However, plastic-eating bacteria have been discovered, offering a potential solution to the challenge of plastic waste.
In 2001, Japanese scientists led by Kohei Oda, a professor at the Kyoto Institute of Technology, discovered bacteria at a rubbish dump that could break down plastic bottles, toys, and other items. The bacteria, named Ideonella sakaiensis, produce a specific enzyme that breaks down PET, the most common plastic in clothing and packaging. This discovery has sparked further research and innovation in the field of plastic degradation.
For example, researchers have developed a plastic-eating E. coli that can transform PET waste into adipic acid, which is used to create nylon materials, drugs, and fragrances. Additionally, since 2021, a French company named Carbios has been utilizing a bacterial enzyme to process PET plastic waste, breaking it down into precursor molecules that can be used to create new plastic. This process brings us closer to achieving infinitely recyclable plastic materials.
The discovery and utilization of plastic-eating bacteria hold great potential for addressing the global plastic crisis. By harnessing the power of these microbes, we can transform plastic waste into valuable resources and contribute to a more sustainable future.
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Decomposition factors
The material and structure of plastic play a significant role in how long it takes to decompose. Single-use plastic bags, for example, take about two decades to break down, while plastic bottles made with polyethylene terephthalate (PET) can take up to 450 years. This is because the chemicals in PET are difficult for bacteria to consume and break down, and they require UV light to degrade. Other types of plastic, like polylactic acid (PLA), a plastic made from corn, can decompose much faster, breaking down into water and carbon dioxide in 47 to 90 days under the right conditions, such as high temperatures in commercial composting facilities.
Bacteria also play a crucial role in the decomposition of plastic. While most bacteria cannot consume and break down the chemicals in plastic, certain types of bacteria, like the species discovered at a dumpsite, can use plastic as food and even survive the toxic chemicals released during the breakdown process. Additionally, enzymes can help break down polymers into smaller units, accelerating the decomposition process.
Environmental factors, such as sunlight exposure, temperature, and humidity, also influence the decomposition rate of plastic. Sunlight, specifically ultraviolet (UV) radiation, breaks down the chemical structure of plastic over time. Warmer temperatures and higher humidity can also accelerate the process, with enzymes breaking down polymers into smaller units within hours under these conditions. However, plastic buried in landfills may not receive sufficient sunlight, slowing down the decomposition process.
It is worth noting that even when plastic breaks down into microplastics, it never fully disappears from the environment. The total amount of plastic ever made, approximately 8.3 billion tonnes, is still present in some form today, impacting ecosystems and human health worldwide.
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Biodegradable alternatives
Plastic is not a material that decomposes easily and can take anywhere from 20 to 500 years to do so, depending on the material and structure. Due to this, many biodegradable alternatives to plastic have been developed.
Paper and Cardboard
Paper and cardboard are easy replacements for plastic in packaging. Paper can be made from trees or stones, and is printable, recyclable, and waterproof. It can be used to make FDA-certified food cartons and can replace plastic in supermarket bags, takeout food cartons, and zip lock bags.
Mushroom-based Products
Packaging made from mycelium, a mushroom root, can replace plastic. The fibres in the mushroom bind agricultural waste into an alternative kind of foam. Agricultural waste products such as rice hulls, cotton hulls, or wheat chaff are placed in a mold and then injected with mushroom spawn. The final product looks and acts like foam without being as harmful to the environment. It is organic, biodegradable, and can be used as compost or mulch.
Milk Plastic
Milk plastic is made from casein, the protein found in milk. It has been used to make plastic for over a century but newer, more long-lasting technology made petrochemical plastic more popular. Now, companies have developed technology that combines casein with clay and a reactive molecule, making the plastic much sturdier.
Bioplastics
Bioplastics are made largely from renewable natural resources and have similar functionality to oil-based polymers. They have the potential to provide benefits for greenhouse gas balances and other environmental impacts. However, they are not widely used as they are not always cost-effective or fit for purpose.
Polylactic Acid (PLA)
PLA is a plastic made from corn that can decompose into water and carbon dioxide in 47 to 90 days. However, it requires the right conditions to achieve these results, such as commercial composting facilities with high temperatures.
Polyhydroxyalkanoate (PHA)
PHA is a biodegradable material that could be used in place of plastics that are moisture or oxygen barriers.
Other biodegradable alternatives to plastic include glass, metal, and stainless steel.
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Recycling methods
Plastic is not a material that decomposes easily, and it must be recycled. Plastic tends to break down into smaller particles until they are too small to be seen, and every molecule of plastic produced since 1907 is still present in the environment. The time it takes for plastic to decompose depends on the material and structure, as well as environmental factors such as sunlight exposure. It is estimated that plastic can take anywhere from 20 to 500 years to decompose. For example, a standard plastic bag takes around 20 years to decompose, while a plastic water bottle made with polyethylene terephthalate (PET) can take approximately 450 years.
Recycling is the process of collecting waste materials, transforming them back into raw materials, and processing them into new products. This helps to reduce waste and ensure that valuable resources are reused instead of being wasted after a single use. The recycling process can be broken down into three common steps:
- Collect and separate recyclable materials from waste.
- Apply one of the three known procedures (mechanical, chemical, or biological) to the residue and revert it into a raw material.
- Turn the raw material into a finished product.
Mechanical recycling is the most prevalent method of recycling plastic and has been used for decades. It involves grinding, washing, sorting, and reprocessing plastic waste to repurpose the material. The plastic can then be converted into other products, substituting for the use of virgin plastics.
Chemical recycling is a newer technology that aims to bring materials back to their raw, high-quality state. This process involves breaking down polymers, the large molecules that make up plastic materials, through pyrolysis, gasification, or depolymerization.
Biological recycling involves the use of bacteria to break down plastic. While most bacteria cannot consume and break down the chemicals used in plastic, certain types of bacteria have been found to break down plastic and survive the toxic chemicals released during the process.
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Environmental impact
Plastic is not a material that decomposes easily, and it is estimated that plastic can take anywhere from 20 to 500 years to decompose, depending on the material and structure. Petroleum-based plastics like Polyethylene terephthalate (PET) do not decompose in the same way organic material does. Instead, they break up into smaller pieces called microplastics, which are now everywhere on Earth. These microplastics pose a deadly problem for wildlife, causing punctured organs or intestinal blockages if ingested. In addition, as plastic degrades, it can leak toxins into the surrounding soil, leading to further environmental issues.
Recycling plastic waste is one way to reduce its environmental impact. Recycling plastic waste reduces fossil fuel utilization, power consumption, and landfilling, which leads to a decline in the emission of greenhouse gases and lowers carbon footprints. However, it is important to note that not all plastic is recycled, and some plastics intended for recycling end up in landfills or are incinerated. In addition, the recycling process can be energy-intensive and contribute to greenhouse gas emissions, especially when transportation is involved.
Another way to reduce the environmental impact of plastic is to use biodegradable plastic. There are two types of biodegradable plastic: plant-based hydro-biodegradable plastic and petroleum-based oxo-biodegradable plastic. Plant-based plastics, such as polylactic acid (PLA), a plastic made from corn, can decompose into water and carbon dioxide in 47 to 90 days under the right conditions. However, biodegradable plastics often require specific waste management methods, such as separate collection and specialized compost facilities, which can be difficult and expensive to implement.
Finally, reducing plastic use and consumption is crucial in minimizing its environmental impact. Single-use plastics, in particular, are a significant contributor to plastic pollution, as they are designed for one-time use and are often not recycled. By reducing plastic waste, reusing and repurposing plastic items, and choosing long-term sustainable alternatives, individuals and communities can help lessen the environmental impact of plastic.
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Frequently asked questions
Recycled plastic is designed to be reused and to retain its shape over time. It is not designed to break down faster. In fact, recycled plastic products are designed to be highly durable.
Plastic is not a material that decomposes easily and must be recycled. It can take anywhere from 20 to 500 years to decompose, depending on the material’s structure and environmental factors such as sunlight exposure.
Photodegradation is a type of decomposition that requires sunlight, not bacteria. When UV rays strike plastic, they break the bonds holding the long molecular chain together. Over time, this can turn a big piece of plastic into microplastics.
