Bioplastic myths busted
Bioplastics, PLA-lined coffee cups and compostable packaging have been in the spotlight with much confusion surrounding their end-of-life and what they are. While it’s great to see bioplastics in the media, the inaccurate reporting is confusing consumers and underestimating the potential benefit these materials can have in diverting organic waste from landfill cleaning up recycling streams and reducing the amount of plastic polluting the world’s oceans.
In this article, I will debunk 10 of these myths and misconceptions about bioplastics.
Like most myths, they are inspired by reality but are mixing up fact and fiction and, in this case, are ultimately unhelpful to a budding industry that is solidly progressing toward a resource-efficient and sustainable future.
1: Bioplastic is just a biodegradable plastic
Bioplastics are a large family of different materials. A plastic material is defined as a bioplastic if it is either biobased, biodegradable, or features both properties.
‘Biobased’ means that the material or product is derived from biomass (plants such as corn, sugarcane, or cellulose), but it doesn’t necessarily mean that it’s biodegradable. Some common plastics like PET can be made from renewable feedstock for instance. Renewable PET (also called “green PET”) and conventional oil-based PET are chemically identical and are not biodegradable.
Biodegradation is a process during which microorganisms that are available in the environment convert materials into natural substances such as water, carbon dioxide, and compost (artificial additives are not needed). The process of biodegradation depends on the surrounding environmental conditions (e.g. location or temperature), on the material and on the application. The term “biodegradable” can be misleading and should be used carefully as it doesn’t imply specific timeframes or conditions. That’s why precise claims that can be verified, such as “compostable” are more accurate and transparent.
Compostable describes materials that are suitable for microbial treatment at the end of life in a composting environment, whether commercial or in the home. Products or materials that pass the required standard for such microbial treatment in these environments may be verified as compostable according to the requirements of the Australian Standards AS 4736-2006 (biodegradable materials suitable for commercial composting) and Australian Standard AS 5810-2010 (biodegradable plastics suitable for home composting).
Biodegradable plastics, also called “oxo-degradable plastics”, are conventional plastics made with fossil fuel and an additive which allegedly allows the rapid degradation of the product. The main problem with these claims is that there is no independently verified conclusive proof that the plastic will completely biodegrade. They are actually known to create small fragments called microplastics, which, when ingested by animals, can eventually make their way up the food chain. All they do is offer consumers and brand owners a false sense of sustainability.
2: All bioplastics are compostable
Not all bioplastics are compostable. The bioplastic we use in BioPak packaging is certified compostable to AS4736 or EN13432, the Australian and European industrial compostability standards. This means it will completely break down in a compost environment within a defined timeframe and leave behind no toxic residues.
Industrial compost facilities harness a natural reaction to process organic waste into compost. Organic waste naturally generates heat once microorganisms start breaking it down. In a commercial compost facility, the temperature and humidity are closely monitored and controlled to optimize and speed up the process. This allows bioplastics that are certified industrially compostable to break down within 12 weeks. Composting is Nature’s way of recycling.
3: Bioplastics can contaminate organic waste for commercial composting
Certified compostable bioplastics do not decrease the quality of the compost created. All BioPak compostable packaging has been certified to AS4736 or EN13432, which means that our products have been independently and completely tested (including inks, glues etc.) for acceptance in suitable commercial compost facilities. Certification gives the composters the confidence that the organic waste they’re accepting will not contaminate their feedstock and will break down within their processing times.
The biggest potential area of impact for compostable plastics is in foodservice. From coffee cups to sandwich packaging to takeaway containers, the packaging and the food waste can be composted together. In addition to its undisputed role in increasing food waste collections, compostable packaging mainly biodegrades into carbon and contributes to the composting process by delivering energy and acting as a bulking agent.
The BioPak Compost Network is proof that organic recycling of foodservice packaging is scalable, practical, and commercially viable. There is a significant opportunity to collect and compost the estimated 900,000 tonnes of organic waste the foodservice and hospitality industry generates. Together with our customers and partners, we’re proving the model in order to empower councils and waste management industries to step up.
4: Bioplastics contaminate mechanical recycling streams
Biobased plastics (see Myth #1) are chemically identical to their fossil-fuel based version, and they can be recycled together.
Compostable bioplastics can technically be recycled via chemical or mechanical recycling. However, due to their relatively low share of plastic volumes, there are only a couple of recycling facilities globally that have the ability to recycle them.
Compostable bioplastics do not contaminate non-bioplastic recycling waste streams. Material Recycling Facilities use sophisticated sorting technologies and treatment and compostable bioplastics are easily identified and separated if they are mixed with other materials. Industrial composting is the best end-of-life option for certified compostable bioplastics such as PLA.
5: Bioplastics biodegrade in landfill
There is no oxygen in landfill and as a result, waste biodegrades very, very slowly. Organic waste such as food waste does end up breaking down, releasing methane, an extremely powerful greenhouse gas.
Compostable bioplastic like PLA is considered to remain inert in landfill, due to this lack of oxygen. Industrial composting is the best end-of-life option for certified compostable bioplastics such as PLA.
6: Bioplastic is just as harmful to the environment as plastic
Bioplastics do not rely on the depletion of a finite fossil source of energy like conventional plastics do. Fossil fuel extraction and the plastic industry are linked to climate change and significant pollution at all stages of production. Bioplastics use 70% less fossil fuels in their production than fossil fuel-based plastics.
The current generation of bioplastics are produced using renewable, abundant and cost-effective sources of plant starch such as corn, sugar beet, cassava and sugarcane. Scientists are working on using algae, bacteria, carbon dioxide and methane gas as next-generation feedstocks that will further reduce the environmental impact of these materials.
7: Bioplastic production depletes feedstock and diverts land from food production
Production of bioplastic has little to no effect on food prices or supply. The land used to grow the renewable feedstock for the production of bioplastics amounted to approximately 0.82 million hectares in 2017, which accounted for less than 0.02% of the global agricultural area of 5 billion hectares, 97% of which were used for pasture, feed and food. Despite the market growth predicted in the next five years, the land use share for bioplastics will remain around 0.02%.
There are also many opportunities for alternative feedstock – including using an increased share of food residues, non-food crops or cellulosic biomass, methane gas and CO2 – that could lead to even less land use demand for bioplastics than the amount given above.
8: Bioplastics contain GMOs
The use of GMO crops is not a technical requirement for the manufacturing of any bioplastic commercially available today. If GM crops are used, the reasons lie in the economic or regional feedstock supply situation. If GM crops are used in bioplastic production, the multiple-stage processing and high heat used to create the polymer removes all traces of genetic material. This means that the final bioplastic product contains no genetic traces. The resulting bioplastic is therefore well suited to use in food packaging as it contains no genetically modified material and cannot interact with the contents.
We use Ingeo™ bioplastic made by Natureworks which is certified GMO-free by Eurofins GeneScan. Eurofins is recognised by both government and NGOs as the leading authority for testing food, feed and raw materials.
9: Reusables are the only eco-friendly solution to solve the world’s plastic problem
While we wholeheartedly support BYO reusables as a solution to single-use plastic consumption, we also recognise it’s not always a practical option. When reusables are not cost-efficient or cause hygiene concerns, compostable single-use foodservice disposables are the best solution – providing a safe, hygienic, and cost-effective way to serve food and beverages to large numbers of people.
10: There’s no point creating compostable packaging when commercial composting infrastructure isn’t yet widely available
The classic ‘chicken and egg’ adage! Waste management industries are the end of the line in our linear consumption economy. Innovation happens at the beginning of the product life-cycle and flows down the line to the waste management industries.
When PET bottles were first introduced they were not recycled and the same can be said for aluminium and metal cans. Only when sufficient demand for a raw material exists does recycling make commercial sense.
Sometimes, we have to lead by example. That’s why we have launched the Compost Network – working with commercial composting facilities in Australia and New Zealand to make commercial composting infrastructure for organics and compostable packaging more readily available. Together with our partners, we are proving the composting infrastructure model as a case study for local councils and waste collection contractors to adopt and make part of the journey towards zero waste. In fact, in the last 12 months, an increasing number of councils have followed suit and introduced food waste collections that include certified compostable packaging.
And it’s good for the local economy too. According to the Australian Organics Recycling Association, one job is supported for every 1,550 tonnes of organic material recycled in Australia. That means that if we can capture the 900,000 tonnes of organic waste the food service industry in Australia produces annually, we can create 581 jobs locally and create much needed compost for our farmers to produce our food.
Information taken from BioPak’s website.
Post by Tallis Baker
Planet Friendly Packaging acknowledges the traditional custodians of the land on which we work.
Our thoughts go out to everyone affected by COVID-19. Stay safe.