Alexei Volkov
Polylactic Acid (PLA) is a bioplastic made from renewable and natural materials such as corn, cassava, and sugarcane. It is often considered a more environmentally friendly alternative to traditional plastics due to its compostability and biodegradability. However, there are several issues with PLA that complicate its eco-friendliness. For example, PLA requires specific conditions, such as high heat and the presence of certain bacteria, to biodegrade effectively, and it is not always properly disposed of or recycled. Additionally, the fertilizers and pesticides used in its production can contribute to greenhouse gas emissions and pollution. While PLA has its advantages, it is important to consider the challenges associated with its use and disposal when evaluating its environmental impact.
| Characteristics | Values |
|---|---|
| Compostable plastics other than PLA | Polylactic Acid (PLA) is made from renewable and natural materials such as corn, cassava, and sugarcane. However, it is not the only compostable plastic. |
| Compostability of PLA | PLA is compostable but only in specific environments with certain oxygen levels and temperatures above 140°F, typically found in industrial compost settings. |
| Biodegradability of PLA | PLA is biodegradable under certain conditions, such as high heat and the presence of specific bacteria, but it can take 80+ years to biodegrade without a commercial composter. |
| Environmental Impact | PLA has a lower carbon footprint and emits fewer greenhouse gases than conventional plastics. However, the fertilizers and pesticides used in its production can release pollutants and greenhouse gases. |
| Recycling Infrastructure | The recycling infrastructure for PLA is still developing, and it cannot be recycled with regular plastic materials. It requires separate sorting and closed composting environments to avoid contaminating the recycling stream. |
| Additives and Processing | The biodegradability of PLA can be affected by additives used in its production, and it undergoes artificial processes such as fermentation, polymerization, and the use of chemical assistants. |
| Cost and Availability | PLA is inexpensive to produce and can be more affordable than conventional plastics as its availability increases. |
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What You'll Learn
- Compostable plastic packaging has been criticised by a committee of MPs in the UK
- PLA is fragile and often used for single-use products
- PLA is less durable, crystalline and heat resistant than petroleum-based plastic
- PLA requires a lot of land to produce
- PLA bioplastic is certified industrially compostable
Compostable plastic packaging has been criticised by a committee of MPs in the UK
Compostable plastic packaging has been criticised by the UK Parliament's Environment, Food and Rural Affairs (Efra) Committee for its potential negative environmental impact. The Committee's report on plastic food and drink packaging, released in September 2019, recommended that the government focus on reducing all single-use packaging rather than switching to compostable alternatives. The report expressed concern that compostable plastics have been introduced without the necessary infrastructure or consumer understanding for proper disposal.
The Efra Committee's report specifically highlighted issues with the labelling of compostable packaging, stating that the required treatment infrastructure is often lacking. This has resulted in compostable packaging contaminating the dry recycling stream or becoming litter. The report also emphasised that compostable plastics are not a substitute for most plastic packaging and should be used selectively. For example, compostable packaging can be useful for intercepting and improving food waste collections and reducing packaging waste that cannot be recycled.
The committee's concerns are shared by the think tank Green Alliance, which has singled out compostable and biodegradable plastic packaging as environmentally detrimental. The Green Alliance asserts that replacing plastic with other materials is not always the best solution, as all materials have some environmental impact. This sentiment is echoed by the Bio-Based and Biodegradable Industries Association (BBIA), which defends the role of compostable packaging when used appropriately.
While compostable plastic packaging, such as Polylactic Acid (PLA), is made from renewable and natural materials, it is not without its eco-issues. PLA, for instance, requires specific conditions, such as high temperatures and exposure to digestive microbes, to biodegrade effectively. These conditions are typically only found in industrial compost environments, and many cities lack the necessary infrastructure for this process. As a result, PLA products often end up in landfills or oceans, contributing to waste rather than providing an eco-friendly solution.
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PLA is fragile and often used for single-use products
Polylactic Acid (PLA) is a plastic material made from renewable and natural materials such as corn, cassava, and sugarcane. It is also made from the waste left over from existing processes like corn cultivation. PLA is mainly used for short-lived and disposable packaging. Due to its fragility, it is not meant to last long-term and is often used for single-use products.
PLA is less durable, crystalline, and heat resistant than petroleum-based plastics and even bioplastic counterparts. It has a low melting point and is not suitable for hot food or reheating. The contents should not exceed 40°C (or 105°F). PLA is also very fragile and, as a result, often needs to be blended with petroleum-based polymers to strengthen it for use.
Because of its fragility, PLA is often used for single-use products. In 2022, of the total PLA production, about 35% was used for flexible packaging (e.g. films, bags, labels) and 30% for rigid packaging (e.g. bottles, jars, containers). PLA is used in a large variety of consumer products such as disposable tableware, cutlery, straws, bags, and housings for kitchen appliances and electronics.
While PLA is compostable, it is not without its issues. It needs to be sorted separately and brought to a "closed composting environment" as otherwise, it contaminates the recycling stream. However, many big cities do not have the correct industrial facilities for the process, which leads to PLA being discarded into landfills.
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PLA is less durable, crystalline and heat resistant than petroleum-based plastic
Polylactic Acid (PLA) is a bioplastic made from renewable and natural materials such as corn, cassava, and sugarcane. It is often touted as a more sustainable alternative to traditional plastics due to its compostability and biodegradability. However, one of the primary drawbacks of PLA is its inferior durability, crystallinity, and heat resistance compared to petroleum-based plastics.
In terms of durability, PLA is very fragile and brittle, which limits its use in applications that require some level of plastic deformation at high-stress levels. This makes PLA more suitable for single-use products rather than long-term use items. To enhance its durability, PLA is often blended with petroleum-based polymers, which can compromise its compostability.
Regarding crystallinity, PLA exhibits a range of structures, from amorphous to semi-crystalline and highly crystalline forms. The degree of crystallinity impacts the mechanical properties of PLA, including its heat resistance and rigidity. Annealing, or heating PLA at specific temperatures, can increase crystallinity and improve its mechanical strength. However, even with these treatments, PLA's crystallinity and heat resistance are generally lower than that of petroleum-based plastics.
PLA's heat resistance is inferior to widely used plastics like polypropylene (PP). While PLA can withstand temperatures of up to 110°C, its heat deflection temperature can be increased by blending it with other polymers. For example, blending PLA with poly-D-lactide (PDLA) can increase its heat deflection temperature to up to 190°C. Despite these improvements, PLA's heat resistance is still not on par with that of petroleum-based plastics.
Overall, while PLA offers a more environmentally friendly alternative to traditional plastics due to its compostability, it faces challenges in terms of durability, crystallinity, and heat resistance. These limitations impact its applicability in certain contexts and often require it to be blended with petroleum-based polymers, reducing its sustainability advantages.
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PLA requires a lot of land to produce
Polylactic Acid (PLA) is a popular plastic material that is made from renewable and natural materials such as corn, cassava, and sugarcane. It is known to be compostable and biodegradable, but this is only true under very specific conditions. It requires temperatures exceeding 140°F (60°C), which can only be achieved in industrial compost environments.
Despite its popularity, there are some concerns about the sustainability of PLA. One of the main issues is that PLA requires a lot of land to produce. The Plastic Pollution Coalition estimated that 3.4 million acres of land would be needed to produce enough PLA to meet global demand. This would take away land needed for other important functions, such as growing food.
The large amount of land required for PLA production is due to the fact that it is made from plant-based resources. Growing crops and using fertilizers can impact land and waterways. The fertilizers and pesticides used to grow the plants that make up PLA can also release pollutants and large amounts of nitrous oxide, a potent greenhouse gas.
In addition, the recycling infrastructure for PLA has not yet been fully developed, and it is often not properly disposed of. As a result, PLA products often end up in landfills or oceans, contributing to plastic waste and environmental pollution.
While PLA is a viable solution for biodegradable and compostable plastic, the amount of land required for its production is a significant concern. As the demand for PLA increases, finding a balance between land use for PLA and other important functions, such as food production, will be crucial.
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PLA bioplastic is certified industrially compostable
Polylactic Acid (PLA) is a type of bioplastic made from renewable and natural materials such as corn, cassava, and sugarcane. It is often considered a more environmentally friendly alternative to conventional plastics due to its compostability and biodegradability.
While PLA is known to be compostable, it is important to note that it requires specific conditions for proper decomposition. PLA is certified for industrial composting, meeting standards such as AS4736 and EN13432. This means that PLA will break down within twelve weeks under commercial composting conditions, specifically in industrial compost environments with controlled temperature and oxygen levels. The composting process involves disintegration and fragmentation by heat, humidity, and fungi, followed by further biodegradation into CO2, water, and biomass.
However, the requirement for industrial composting facilities presents a challenge. Many cities lack the necessary infrastructure, leading to PLA being discarded into landfills or oceans instead of being properly composted. Additionally, PLA needs to be sorted separately from regular plastic materials to avoid contaminating the recycling stream.
To address these issues, companies like BioPak are working on creating the right infrastructure for waste collection to ensure proper disposal and composting of PLA. Furthermore, advancements in technology, such as CARBIOS Active, have made it possible for PLA to be composted even in domestic conditions, expanding its compostability beyond industrial settings.
While PLA bioplastic is certified for industrial composting, it is not currently certified for home composting (AS5810). However, with ongoing improvements in technology, there is hope that PLA will eventually become a fully home compostable resource.
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Frequently asked questions
Polylactic Acid (PLA) is a bioplastic made from renewable and natural materials such as corn, cassava and sugarcane.
Although PLA is known to be compostable, it is not automatically sustainable. The fertilisers and pesticides used to grow the plants that make up PLA could release more pollutants and the water needed to make PLA is 38% more than polypropylene and 10% more than PET. PLA also requires a lot of land to produce and is often used for single-use products.
PLA is made from rapidly renewable plant starch, whereas virgin PET plastic is mostly made using limited fossil resources. PLA production emits fewer greenhouse gas emissions than conventional plastics and it will break down within twelve weeks under commercial composting conditions.
