Omar Khalid
Biodegradable plastics are plastics that can be broken down by microorganisms into water, carbon dioxide, and biomass. They are often touted as eco-friendly alternatives to traditional plastics, which can take up to 500 years to decompose while leaching toxic chemicals into the ground. However, biodegradable plastics are rarely recyclable and may not break down as intended if not managed properly. They may also contaminate the recycling stream and require specific conditions, such as industrial composting facilities, to biodegrade. While some biodegradable plastics have been developed, the best solution to prevent pollution and waste is to avoid single-use plastics altogether.
| Characteristics | Values |
|---|---|
| Definition | Biodegradable plastic is defined by its ability to break down completely into substances found in nature, such as water, carbon dioxide, and biomass, within a reasonable timeframe. |
| Composition | Biodegradable plastics are commonly produced with renewable raw materials, microorganisms, petrochemicals, or combinations of these. They are made from bio-based sources such as seaweed, sugar beets, or other plants, instead of fossil fuels. |
| Benefits | Reduced use of fossil fuel resources, smaller carbon footprint, and faster decomposition compared to traditional plastics. |
| Limitations | Biodegradable plastics are rarely recyclable and often end up in landfills unless properly composted. They may also release metals and take a long time to degrade in certain circumstances. |
| Standards | There is no international standard for defining home-compostable plastics. However, national standards exist in Australia (AS 5810) and France (NF T 51-800). |
| Innovations | Scientists at the University of California, Berkeley, have developed a process to make biodegradable plastics truly compostable, using just heat and water within a few weeks. |
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What You'll Learn
Biodegradable plastic is not always compostable
The world has produced over nine billion tons of plastic since the 1950s, with 165 million tons polluting our oceans. With growing consumer awareness, companies are facing pressure to reduce their use of disposable plastics and adopt more eco-friendly alternatives. This has led to a rise in biodegradable and compostable plastic products. However, the terms "biodegradable" and "compostable" are often misused and misunderstood, leading to confusion and greenwashing.
Biodegradable plastic is defined by its ability to break down completely into natural substances within a reasonable timeframe. While compostable plastic also biodegrades, it is specifically designed and tested for processing in home or industrial composting facilities, where specific conditions like temperature and moisture are maintained to create usable soil conditioners. Biodegradable plastic, on the other hand, lacks defined conditions for breaking down and is typically tested under controlled laboratory conditions.
The problem with biodegradable plastic is that it may not always biodegrade as intended in the natural environment. Nature does not have the same controlled conditions as a laboratory, so there is no guarantee that biodegradable plastic will break down if littered. In such cases, biodegradable plastic can have the same detrimental effects as non-biodegradable plastic, contributing to pollution and harming ecosystems. Additionally, biodegradable plastic is rarely recyclable and often ends up in landfills, further exacerbating the issue.
To clarify, biodegradable does not always mean compostable. Compostable plastic is designed for either home or industrial composting facilities, depending on the specific item. Commercial composters may not accept certified compostable plastic items, and both compostable and biodegradable plastic can contaminate the recycling stream. Therefore, it is crucial to check local recycling guidelines and only recycle items accepted by the program.
In conclusion, while biodegradable and compostable plastics can play a role in reducing waste, they are not a panacea for the plastic pollution crisis. Consumers should be cautious of misleading labels and understand that proper waste disposal and reduction in plastic usage are essential to mitigating the environmental impact of plastics.
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Bioplastics are not always biodegradable
Bioplastics are often touted as being eco-friendly, but they are not always biodegradable. The term "bioplastic" is used for two separate things: bio-based plastics (plastics made at least partly from biological matter) and biodegradable plastics (plastics that can be completely broken down by microbes in a reasonable timeframe, given specific conditions). Not all bio-based plastics are biodegradable, and not all biodegradable plastics are bio-based.
Even biodegradable bioplastics may not biodegrade in every environment. They often require high-temperature industrial composting facilities to break down, and very few cities have the infrastructure needed to deal with them. As a result, bioplastics often end up in landfills, where they may release methane, a greenhouse gas 23 times more potent than carbon dioxide.
Biodegradable bioplastics are also rarely recyclable. They can contaminate batches of recycled plastic and harm recycling infrastructure. For example, if bioplastic contaminates recycled PET (polyethylene terephthalate, the most common plastic used for water and soda bottles), the entire lot could be rejected and end up in a landfill. Therefore, separate recycling streams are necessary to properly discard bioplastics.
Furthermore, the crops that produce bioplastics can also be used to feed people, so the land required for bioplastics competes with food production. A 2010 study from the University of Pittsburgh found that bioplastics were not necessarily more eco-friendly when their life cycles were taken into consideration.
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Biodegradable plastic may not break down in nature
Biodegradable plastic is often touted as a solution to the plastic pollution crisis. However, the reality is more complex. While biodegradable plastic can break down completely into substances found in nature, this process relies on specific conditions that may not be present in natural environments.
Biodegradable plastic is typically made from bio-based sources such as seaweed, sugar beets, or plants, rather than fossil fuels. It is designed to be broken down by microorganisms into water, carbon dioxide, and compost. However, the presence and activity of these microorganisms depend on factors such as oxygen levels, UV exposure, and temperature, which can vary widely in nature.
In laboratory settings, biodegradable plastic is tested under controlled conditions to ensure it breaks down as intended. However, nature does not provide such controlled conditions. As a result, there is no guarantee that biodegradable plastic will actually biodegrade if it ends up in natural environments, such as oceans or soil.
When biodegradable plastic does not break down as expected, it can have similar negative consequences as non-biodegradable plastic. It can pollute ecosystems and habitats, contribute to the growing plastic pollution crisis, and harm the plants, animals, and people that depend on these environments.
Furthermore, the recycling and composting of biodegradable plastic present additional challenges. Biodegradable plastic often cannot be recycled due to the presence of chemical additives, and it may not be accepted by commercial composters even if certified as compostable. Improper disposal of biodegradable plastic can lead to contamination in the recycling stream and further environmental damage.
While biodegradable plastic may be a step towards more sustainable materials, it is not a panacea for the plastic pollution crisis. To effectively address this crisis, a multifaceted approach is necessary, including reducing plastic usage, improving recycling and composting practices, and developing truly eco-friendly alternatives.
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Bioplastics are not always eco-friendly
Bioplastics are often praised as being eco-friendly, but they may not always be. While bioplastics are generally considered to be more eco-friendly than traditional plastics, a 2010 study from the University of Pittsburgh found that this was not necessarily true when the materials' life cycles were taken into consideration.
Bioplastics are made from organic materials such as corn starch, sugar cane, wheat, seaweed, sugar beets, or other plants, instead of fossil fuels. They are also relatively expensive; for example, PLA can be 20 to 50 percent more costly than comparable materials because of the complex process used to convert corn or sugarcane into the building blocks for PLA. However, prices are coming down as researchers and companies develop more efficient and eco-friendly strategies for producing bioplastics.
Biodegradable bioplastics can break down or "biodegrade" when microorganisms digest the building blocks that make up the material. However, this only happens under specific conditions, such as controlled levels of oxygen, UV exposure, and temperature in a lab. In nature, these conditions cannot be guaranteed, and biodegradable bioplastics may not break down as intended, having the same negative consequences as traditional plastics.
Additionally, biodegradable bioplastics are rarely recyclable and often end up in landfills. Compostable bioplastics are designed to be processed in either home or industrial composting facilities, but they can contaminate the recycling stream if they end up in the wrong facility. Bioplastics can also contain toxic chemicals, and little is known about the safety of these compounds.
Overall, while bioplastics may be a step in the right direction, they are not a perfect solution to the plastic pollution crisis. It is important to reduce and reuse plastic and shift to a circular economy, rather than relying solely on bioplastics as an eco-friendly alternative.
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Biodegradable plastic can be made from plants, animals, or microorganisms
Biodegradable plastic is a more sustainable alternative to traditional plastics, which are derived from non-renewable fossil fuels and can take centuries to break down, causing environmental pollution and harm to wildlife. Bioplastics, on the other hand, are made from renewable resources and have the potential to be more environmentally friendly. They can be produced from plants, animals, or microorganisms, each offering unique advantages in terms of sustainability and biodegradability.
Plants provide a significant source of renewable resources for bioplastic production. Corn starch, sugarcane, cassava, potato starch, and cellulose are common plant-based materials used in bioplastic manufacturing. These plant-based bioplastics are biodegradable and compostable, reducing plastic waste in landfills and oceans. They also offer economic benefits by creating new markets for agricultural products and reducing dependence on non-renewable resources. However, challenges such as higher production costs and limited scalability must be addressed to make plant-based bioplastics more widely adopted.
Animal processing co-products and wastes, such as collagen, gelatin, keratin, myofibrillar proteins, and chitosan, can be utilized in the production of biodegradable plastics. While these materials have applications in the food and pharmaceutical industries, their potential for generating bioplastics is underutilized. By converting these animal-based renewable sources into bioplastics, we can reduce our reliance on petroleum-based materials, lower manufacturing costs, and contribute to a more circular bio-economy.
Microorganisms play a crucial role in the biosynthesis of certain bioplastics, such as polyhydroxyalkanoate (PHA) and polyhydroxybutyrate (PHB). PHA is produced by microorganisms, sometimes genetically engineered, that are deprived of certain nutrients but fed high levels of carbon. Companies can then harvest the microbe-made PHA, which has a chemical structure similar to traditional plastics. PHB, on the other hand, is an attractive substitute for petrochemical plastic due to its similar properties, biocompatibility, and biodegradability. While the cost of PHB production currently inhibits its widespread use, intensive research is being conducted to reduce costs and improve its processing properties.
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Frequently asked questions
Biodegradable plastics are plastics that can be decomposed by the action of 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 often made from biobased sources such as seaweed, sugar beets, or other plants, instead of fossil fuels. Bioplastics and ‘compostable’ plastics tend to be made from plant biomass, such as corn starch, sugar cane, or wheat.
Biodegradable plastics are very rarely recyclable, and they often end up in landfills unless composted appropriately. They can also contaminate the recycling stream. Compostable and biodegradable plastic alone will not solve the plastic pollution crisis. However, if sourced responsibly, biodegradable plastics can offer environmental benefits.
While biodegradable plastics do exist, they rarely work as intended in nature. They often require specific conditions to break down, such as regulated temperatures for approximately 6 months, or industrial composting facilities. Some biodegradable plastics also fragment into microplastics rather than fully biodegrading. However, scientists are working on new processes to make biodegradable plastics truly compostable.
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