Maya Ellison
Bioplastics are plastic materials produced from renewable biomass sources such as sugarcane, corn, and yeast. They are biodegradable materials that come from renewable sources and can be used to reduce plastic waste. Bioplastics can utilize previously unused waste materials such as straw, woodchips, sawdust, and food waste. Biodegradable plastics, on the other hand, are plastics that can be decomposed by living organisms, usually microbes, into water, carbon dioxide, and biomass. They are commonly produced with renewable raw materials, micro-organisms, petrochemicals, or combinations of all three. Biodegradable plastics are becoming a more frequent option on store shelves as the demand for green products grows. However, it is important to note that not all bioplastics are biodegradable, and some biodegradable plastics are fully petroleum-based.
| Characteristics | Values |
|---|---|
| Definition of Bioplastics | Bioplastics are plastic that is made (at least in part) by plants or fibers and/or is biodegradable in some way. |
| Definition of Biodegradable Plastics | Biodegradable plastic can be broken down completely into water, carbon dioxide, and compost by microorganisms under the right conditions. |
| Compostable Plastics | Compostable plastic will biodegrade in a compost site. |
| Compostable vs Biodegradable | Compostable plastics are a type of biodegradable plastic. |
| Degradable Plastics | All plastic is degradable, even traditional plastic. Photodegradable plastic breaks down more readily in sunlight; oxo-degradable plastic disintegrates more quickly when exposed to heat and light. |
| Bioplastics and the Environment | Bioplastics are generally considered to be more eco-friendly than traditional plastics, but a 2010 study found that this wasn't necessarily true when the materials' life cycles were taken into consideration. Bioplastics produce fewer greenhouse gas emissions than traditional plastics over their lifetime. |
| Bioplastics and the Ocean | If a bioplastic ends up in the ocean, it will behave like traditional plastic unless it is marine biodegradable certified. |
| Bioplastics and Composting | Compostable bioplastics are engineered to fully decompose within 12 weeks at a commercial composting facility. Some bioplastics are home compostable. |
| Bioplastics and Recycling | While recycling is the preferred outcome for most packaging, composting is preferred to landfill or litter. |
| Bioplastics and the Food Industry | Compostable solutions are an exciting innovation for the food industry because they allow consumers to compost the package and the food remnants in the packaging, diverting food waste from landfills. |
| Bioplastics and the Packaging Industry | Bioplastics are currently used in disposable items like packaging, containers, straws, bags, and bottles. The global bioplastic market is projected to grow from $17 billion in 2022 to $57 billion in 2032. |
| Bioplastics and the Medical Industry | Bioplastics like PHA are used for medical applications such as sutures, slings, bone plates, and skin substitutes due to their biodegradable nature and ability to not harm living tissue. |
| Bioplastics and the Automotive Industry | Carmakers like Ford and General Motors are using soy-based polyurethanes to manufacture seats, headrests, and tire gaskets. |
| Bioplastics and Regulation | There are no federal standards that define or regulate bioplastic, biodegradable, or compostable products. Most states do not require 'compostable' products to be certified, leading to consumer confusion. |
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What You'll Learn
Bioplastics are not all equally biodegradable
Bioplastics are derived from renewable biological sources such as plants, unlike traditional plastics that are petroleum-based. They are designed to address environmental concerns associated with conventional plastics, including pollution and reliance on fossil fuels. Bioplastics are generally considered to be more eco-friendly than traditional plastics, but this is not always the case when their entire life cycle is taken into account.
Bioplastics that don't biodegrade quickly are called "durable", and some bioplastics made from biomass that cannot easily be broken down by microorganisms are considered non-biodegradable. Compostable plastics can increase contamination at composting facilities, as accepting food packaging leads to a lot of unwanted, non-biodegradable items getting tossed in with them, resulting in the end product containing a lot of conventional plastic.
Furthermore, the production of bioplastics can have varied carbon footprints. While some bioplastics have a lower carbon footprint than traditional plastics, others may have an even greater environmental impact when their lifetime impact is considered. For example, compostable and bioplastic packaging may produce significantly more greenhouse gas emissions than single-use plastic due to the emissions created during the agricultural phase.
In conclusion, while bioplastics have the potential to be more environmentally friendly than traditional plastics, it is important to recognize that not all bioplastics are equally biodegradable, and their environmental impact can vary depending on various factors such as the production process, infrastructure, and proper disposal methods.
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Biodegradable plastics are compostable
Biodegradable plastics are a potential solution to the global plastic pollution problem. They are made from renewable raw materials, microorganisms, petrochemicals, or a combination of these. Biodegradable plastics can be decomposed by microorganisms into water, carbon dioxide, and biomass. However, they may not always break down as intended if not managed properly.
Compostable plastics are a type of biodegradable plastic that can be broken down by microorganisms under controlled conditions of oxygen, temperature, and moisture. They leave no toxic residue and biodegrade within a few weeks to months. Certified compostable bioplastics can fully decompose within 12 weeks at a commercial composting facility.
While biodegradable plastics are compostable, not all composting facilities accept them due to contamination concerns. Many compostable plastics require industrial composting facilities with specific temperature and pressure conditions to break down, and most cities lack this infrastructure. Additionally, there is consumer confusion due to a lack of standardized labelling and federal standards for compostable products.
To ensure proper composting of biodegradable plastics, consumers should check their local recycling guidelines and only recycle items accepted by their program. Proper waste management and recovery systems are crucial to prevent biodegradable plastics from causing environmental damage if they end up as litter.
In summary, biodegradable plastics are compostable under specific conditions, but infrastructure and standardization limitations currently challenge their effective implementation.
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Bioplastics are made using the same processes as traditional plastics
Bioplastics are made from renewable biomass sources, such as natural materials like shellac or cellulose, and can be produced from processing directly from natural biopolymers, including polysaccharides (e.g., corn starch or rice starch, cellulose, chitosan, and alginate) and proteins (e.g., soy protein, gluten, and gelatin). They can also be made from chemical synthesis from sugar derivatives (e.g., lactic acid) and lipids.
Starch-based bioplastics, for example, are often blended with biodegradable polyesters to produce starch/polylactic acid, starch/polycaprolactone, or starch/Ecoflex blends. These blends are used for industrial applications and are compostable. Another example is PHA (polyhydroxyalkanoate), which is made by microorganisms that produce plastic from organic materials. Companies can then harvest the microbe-made PHA, which has a similar chemical structure to traditional plastics.
Bioplastics can also utilize previously unused waste materials, such as straw, woodchips, sawdust, and food waste, and they can be made with a lower carbon footprint than their fossil counterparts. For instance, when biomass is used as a raw material and for energy production, the carbon footprint is reduced. However, it is important to note that not all bioplastics are equally biodegradable, and some bioplastics' processes result in a higher carbon footprint than fossil plastics.
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Bioplastics are generally considered to be more eco-friendly
Bioplastics are often advertised as the solution to the world's plastic pollution issues. They have several advantages over traditional plastics, such as reduced use of fossil fuels, a smaller carbon footprint, and faster decomposition. Bioplastics are also less toxic and do not contain bisphenol A (BPA), a hormone disruptor often found in traditional plastics.
However, bioplastics have their own set of issues. For example, they require land to grow the plants used in production, and these plants are often grown as monocrops, which is less environmentally beneficial than growing a diverse range of crops. The production of bioplastics also requires the use of fertilizers and pesticides, which can contribute to increased pollution. Additionally, bioplastics must be disposed of properly to avoid negative implications for recycling and landfills. Most bioplastics require industrial composting facilities to break down quickly and safely, but many cities lack the necessary infrastructure. If bioplastics are disposed of in landfills, they can produce methane, a greenhouse gas much more potent than carbon dioxide.
Furthermore, the lack of standardized definitions and regulations for bioplastics can lead to consumer confusion. The term 'bioplastics' is often used broadly to refer to plastic that is bio-based, biodegradable, or compostable, and it can even include plastic that is mostly made from fossil fuels. Without clear labelling, consumers may be misled about how to properly dispose of bioplastic products, leading to increased plastic waste.
While bioplastics have the potential to be more eco-friendly, it is important to carefully consider their entire life cycle, including land use, energy consumption, water use, greenhouse gas emissions, and proper disposal methods, to fully understand their environmental impact.
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Compostable plastics increase contamination
The use of compostable plastics has led to an increase in contamination, both in terms of chemical and non-biodegradable waste. Composting facilities are increasingly reluctant to accept bioplastics due to the contamination they cause. The lack of standardisation in labelling compostable products leads to consumer confusion, resulting in non-biodegradable items being tossed in with compostable foodware. This means that the end product often contains a significant amount of conventional plastic.
For instance, composters in Oregon have requested that residents refrain from placing any plastic compostable foodware in their green bins. Similarly, many commercial composting facilities in California do not accept bioplastics, and some refuse any foodware altogether. The contamination is not only due to non-biodegradable waste but also chemical additives. Compostable food serviceware has been found to contain per- and polyfluoroalkyl substances (PFAS).
The word 'bioplastics' lacks a standardised definition, and products labelled as biodegradable or compostable may not meet any standards. Bioplastics may be made from plant material such as corn, sugar beets, or potato starch, but they can also contain up to 80% fossil fuel-based plastic. The production of bioplastics can have a significant environmental impact, requiring fossil fuels, farmland, and water—resources that could be used to grow food.
Bioplastics are also not always properly discarded, leading to contamination in batches of recycled plastic and harming recycling infrastructure. While bioplastics are generally considered more eco-friendly than traditional plastics, a 2010 study from the University of Pittsburgh found that this was not always the case when considering the materials' life cycles. The biodegradability of bioplastics is advantageous, but most require high-temperature industrial composting facilities to break down, and very few cities have the necessary infrastructure. As a result, bioplastics often end up in landfills, where they can release methane, a potent greenhouse gas.
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Frequently asked questions
Bioplastics are plastics made from plants or other biological sources, such as wheat starch or corn starch. They are designed to be biodegradable, which means they can be broken down by microorganisms into water, carbon dioxide, and compost.
Biodegradable plastics are those that can be broken down by microorganisms into water, carbon dioxide, and compost. This process typically occurs in a commercial composting facility or a home compost heap.
Bioplastics are made from renewable resources, such as plants, while traditional plastics are derived from fossil fuels. Bioplastics also produce fewer greenhouse gas emissions over their lifetime and are generally considered more eco-friendly.
No, not all bioplastics are biodegradable. Some bioplastics are made from a combination of plants and petroleum-based plastics, which may not be easily broken down by microorganisms.
Biodegradable plastics provide a sustainable alternative to traditional plastics by offering a disposal option through composting. They help divert food waste from landfills and reduce the consumption of fossil fuel resources. Biodegradable plastics are also being used in the medical field due to their compatibility with living tissue.
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