Sofia Martinez
Plastic is a significant contributor to pollution, with 85% of the 40 million metric tons of plastic produced in the US each year ending up in landfills. Plastic is not biodegradable, but biodegradable plastic is becoming a more common alternative on store shelves. However, biodegradable plastic is not a perfect solution to plastic pollution. It often requires specific conditions to break down, such as industrial composting systems, and can take a long time to degrade. If not managed properly, biodegradable plastic can have the same environmental consequences as conventional plastic. Nevertheless, biodegradable plastic can be beneficial in certain applications, such as compostable takeout containers.
| Characteristics | Values |
|---|---|
| Are plastic containers biodegradable? | Most plastic containers are not biodegradable. |
| Biodegradable plastic alternatives | Lignin, seaweed, sugar beets, plants, hemp, paper, cellulose, PLA |
| Biodegradable plastic challenges | Requires well-managed waste systems, may release metals, may not break down as intended |
| Biodegradable plastic benefits | Reduces waste, environmentally friendly, compostable, made from bio-based sources |
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What You'll Learn
Plastic containers are not biodegradable
Most petroleum-based plastics are not biodegradable. They are designed to be durable and not break down during normal use, but this also means they don't break down after they're discarded. Plastic will not biodegrade regardless of how it is disposed of. Even without human intervention, wind currents, sunlight, and other natural processes will slowly wear plastic down, but this process can take hundreds or even thousands of years.
Single-use plastic packaging makes up about 40% of all plastic produced. These plastic items are used for a few hours before becoming trash, and when thrown into landfills, they release pollutants that persist. Plastic does not revert to nature as a banana peel or a wooden toy does. Instead, it breaks down into smaller pieces called microplastics, which can further break down into nanoplastics. These tiny particles can easily infiltrate our bodies through our skin, food, and even the air we breathe.
While biodegradable plastics are becoming a more frequent option on store shelves, they are not a perfect solution to the plastic pollution problem. Biodegradable plastic must be managed properly once it becomes waste, or it will not break down as intended. Compostable plastic, for example, must be recovered in either home or commercial compost, depending on what the item is designed for. Biodegradable plastic is tested under controlled conditions in a lab, but nature does not have controlled conditions, so it is uncertain if biodegradable plastic will actually biodegrade in the natural world if it is littered.
There are some biodegradable packaging options available, such as paper, hemp, and seaweed. However, not all of these options are suitable for food packaging, and some are not yet commercially available.
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Compostable plastic alternatives
Plastic containers are not biodegradable. However, there are compostable plastic alternatives available.
The demand for biodegradable and compostable plastic is increasing as more people are concerned about the impact of plastic waste on the environment. Biodegradable and compostable plastic can play a helpful role in reducing waste, but it is not a complete solution to the plastic pollution crisis. Proper waste management is critical to ensuring that biodegradable and compostable plastics break down as intended and do not contribute to environmental damage.
Other compostable plastic alternatives include packaging made from mycelium, the root of mushrooms. Agricultural waste products such as rice hulls, cotton hulls, or wheat chaff are combined with mushroom spawn in a mold to create a foam-like material that is organic, biodegradable, and can be used for compost or mulch. Additionally, milk plastic, made from casein, the protein found in milk, has been used as an alternative to traditional plastic.
Algae-based compounds are also being explored as potential replacements for plastic, offering similar properties without the negative environmental impact. While these alternatives show promise, challenges remain in terms of scaling up production and ensuring proper waste management to maximize their environmental benefits.
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Biodegradable plastic production
Plastic containers are not biodegradable. However, there is a growing trend of using biodegradable plastics for disposable items such as packaging, cutlery, and food service containers. Biodegradable plastics are derived from biopolymers extracted from decomposed plants and animals. They can also be manufactured using plant-based polymers, mainly starch, or a biopolymer called chitin, extracted from insect skins, shellfish shells, and fungal cell walls.
The manufacturing process for biodegradable plastics varies depending on the type of plastic being produced. It generally involves handling, mixing, extrusion, and cooling. Here is a more detailed breakdown of the process:
Raw Material Handling
The first step is to unload and store the raw materials, which may include starch, polymer pellets, and additives. Pneumatic conveying systems are used to transport these materials from storage to processing equipment.
Mixing and Blending
Specialized blenders are used to mix and blend the ingredients in the plastic formulation, ensuring they are evenly distributed. This step is crucial for achieving the desired properties in the final product.
Extrusion and Molding
The mixed materials are then extruded and molded to form the desired shape of the plastic product.
Packaging and Storage
Once the biodegradable plastic products are created, they are packaged and stored for distribution.
It is important to note that while biodegradable plastics offer a more sustainable alternative to conventional plastics, they are not a perfect solution to the plastic pollution crisis. Proper waste management systems are necessary to ensure these materials break down as intended. Additionally, the environmental impact of producing biodegradable plastics from natural materials is still a subject of debate.
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Plastic pollution crisis
Plastic is a significant contributor to pollution, with plastic waste entering our oceans at an alarming rate of a dump truck's worth per minute. The issue is not just the amount of plastic being produced and discarded, but also the fact that plastic does not readily biodegrade. Even without human intervention, natural processes will slowly wear plastic down over hundreds or even thousands of years, but it does not revert to nature like organic waste. Instead, plastic breaks down into smaller and smaller pieces, eventually becoming microplastics and then nanoplastics, which can infiltrate our bodies through skin contact, ingestion, and inhalation.
The plastic pollution crisis has led to a growing demand for "green" products and an increase in the production of biodegradable plastics. Biodegradable plastics are designed to break down under specific conditions, such as exposure to sunlight, air, and water, and can be made from bio-based sources like seaweed, sugar beets, or other plants. However, it is important to note that biodegradable plastics are not a silver bullet solution to the plastic pollution crisis. They must be managed properly and paired with the right recovery systems to ensure they break down as intended. If biodegradable plastics are not disposed of correctly, they can end up in landfills or the natural environment, where they may not biodegrade and can contribute to the existing plastic pollution problem.
Compostable plastic, for example, must be recovered through home or commercial composting methods, depending on its specific design. Biodegradable plastic, on the other hand, does not have defined conditions for breaking down and may never fully biodegrade in nature. Additionally, some biodegradable plastics may release metals or fragment into microplastics that do not continue to degrade, further exacerbating the pollution issue. The effectiveness of biodegradable plastics in combating the pollution crisis is, therefore, dependent on proper waste management systems and consumer education.
To address the plastic pollution crisis, a multi-pronged approach is necessary. While biodegradable plastics can play a role in specific applications, such as compostable takeout containers, they are not a standalone solution. Reducing, reusing, and recycling plastic are crucial components of a circular economy. Investing in zero-waste solutions, such as refillable containers and reusable packaging, and advocating for legislation to support the transition away from single-use plastics are also essential strategies in mitigating the plastic pollution crisis.
The plastic pollution crisis is a pressing global issue that requires collective action. While biodegradable plastics may have a role in certain applications, they must be used in conjunction with other strategies to effectively reduce plastic pollution. Proper waste management, consumer education, and a shift towards more sustainable alternatives are key components in addressing this crisis and protecting the ecosystems and habitats that depend on it.
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Biodegradable food packaging
Plastic containers are typically made from petroleum-based plastic and do not biodegrade when disposed of. However, there are some petroleum-based plastics composed of weaker types of carbon chains that degrade efficiently and are suitable for biodegradable food packaging. For example, TIPA uses a blend of fossil fuel-based and bio-based materials in its certified biodegradable films and packaging.
The advantages of biodegradable food packaging are clear: it can help eliminate waste and boost food production by redirecting waste to compost, creating nutrient-rich soil to support farming and grow more food. However, biodegradable food packaging is not a panacea for the plastic pollution crisis. It requires proper waste management to ensure it breaks down as intended. If biodegradable plastic ends up as litter or in conventional waste streams like landfills, it may not break down, contributing to the plastic pollution problem.
To address these challenges, new standards for biodegradable plastic have been published, requiring it to degrade to a wax with no microplastics or nanoplastics within two years. Additionally, biodegradable plastic must be collected and paired with the right recovery systems to keep it out of nature. Compostable takeout containers, for example, can be sent to commercial composting facilities for proper disposal.
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Frequently asked questions
Conventional plastic containers are not biodegradable.
Plastic is derived from organic products such as cellulose, coal, natural gas, salt, and crude oil.
Biodegradable alternatives to conventional plastic containers include paper, hemp, seaweed, and cellulose.
Biodegradable containers are compostable, but they require specific conditions to break down. For example, compostable plastic must be recovered in either home or commercial compost, depending on what the item is designed for.
Biodegradable containers can be better for the environment, but they are not a panacea for plastic pollution. For example, biodegradable containers often require specific conditions to break down, and if they are not managed properly, they may not break down as intended.
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