Chloe Zhang
Plastic pollution is a pressing issue, with plastic bags being a major contributor to the problem. These bags, derived from fossil fuels, often end up in landfills and oceans, where they persist for extended periods, causing harm to marine life and the environment. While most petroleum-based plastics are not readily biodegradable, there is ongoing research into the potential of microorganisms to break down these resilient materials. This exploration focuses on various environments, including hot springs, island beaches, recycling facilities, and the guts of insects and invertebrates, where specific microbes may have evolved the capacity to degrade plastics. The quest for plastic-munching microbes and enzymes holds promise for innovative recycling methods and the development of biodegradable bioplastics.
| Characteristics | Values |
|---|---|
| Plastic bags can be broken down by microorganisms | Yes, but it is a very slow process |
| Types of plastic bags that can be broken down | Traditional plastics such as PE, PS, PP, PVC, PET, PUR, and other plastic polymers |
| Types of microorganisms that can break down plastic bags | Bacteria, fungi, Firmicutes, Proteobacteria, Ascomycetes, Basidiomycetes, etc. |
| Factors influencing the breakdown process | Environmental conditions, enzyme systems, and industrial composting facilities |
| Impact of plastic bags on microorganisms | Impairs the growth of Prochlorococcus, a marine bacterium essential for oxygen production |
| Global efforts to address plastic bag waste | Bans, regulations, and recycling initiatives in various countries and communities |
| Recycling processes for plastic bags | Sorting, melting, and solidifying into pellets for lower-grade plastics; enzyme-based recycling |
| Challenges with plastic bags | Not easily biodegradable, photo-degrade into microplastics, and contain toxic additives |
| Health risks associated with plastic bags | Endocrine disruptors linked to cancers, birth defects, and immune system suppression |
| Environmental impact of plastic bags | Confused as food by marine life, contribute to pathogen dispersal, and provide raft for antibiotic resistance |
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What You'll Learn
Microorganisms can break down plastic
Plastic is a long-chain molecule or macromolecule with a high molecular weight, hydrophobicity, and crystallinity. These properties have made it difficult for most microorganisms to break down plastic. However, recent research has shown that some microorganisms can break down plastic.
Ideonella sakaiensis is a bacterium capable of breaking down and consuming polyethylene terephthalate (PET), a contributor to microplastic pollution in oceans that is used in everything from water bottles to clothing. The bacterium was first identified in 2016 by a team of researchers led by Kohei Oda of the Kyoto Institute of Technology and Kenji Miyamoto of Keio University. The bacteria was first isolated from a consortium of microorganisms in a sediment sample taken outside of a plastic bottle recycling facility in Sakai City, Japan. The entire microbial community was shown to mineralize 75% of the degraded PET into carbon dioxide once it had been initially degraded and assimilated by Ideonella sakaiensis.
Researchers have also genetically engineered a marine microorganism to break down plastic in saltwater. The modified organism can break down PET. The researchers worked with two species of bacteria. The first, Vibrio natriegens, thrives in saltwater and reproduces very quickly. The second, Ideonella sakaiensis, produces enzymes that enable it to break down and metabolize PET. By introducing the plasmid containing the I. sakaiensis genes into V. natriegens bacteria, the researchers were able to get V. natriegens to produce the desired enzymes on the surfaces of their cells. The researchers then demonstrated that V. natriegens could break down PET in a saltwater environment at room temperature.
In addition to these microorganisms, researchers across the globe are searching for plastic-munching microbes in various environments, including searing hot springs in Yellowstone National Park, remote island beaches in the Pacific Ocean, and a plastic recycling factory in Japan.
The discovery and development of microorganisms that can break down plastic hold great potential for addressing the global problem of plastic pollution.
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Plastic-eating microbes
Plastic pollution is a pressing issue, with only 19% of plastic being recycled as of 2017. The rest is often incinerated, buried in landfills, or dumped in the environment. While reducing plastic production and usage is ideal, plastic-eating microbes may provide a solution to our existing plastic waste problem.
In 2001, Japanese scientists discovered bacteria in a rubbish dump that were breaking down plastic and using the carbon for energy. These microbes hold the potential to fully process plastic into basic nutrients. Since then, researchers have been searching for plastic-eating microbes in various environments, including mangrove forests in Indonesia, hot springs in Yellowstone National Park, and remote island beaches in the Pacific Ocean.
One approach to harnessing the power of these microbes is to identify and isolate the specific enzymes they use to break down plastic. By understanding the structure and function of these enzymes, we can develop more efficient methods for plastic recycling. For example, a French company, Carbios, is working on building the world's first enzyme-fueled plastic recycling factory, aiming to convert plastic trash into raw materials for new PET plastic.
Another strategy is to incorporate spores of plastic-eating bacteria into plastic products. These spores remain dormant during the useful lifetime of the product but become active when exposed to nutrients in compost, allowing them to digest the plastic and mitigate plastic pollution. This approach not only helps eliminate plastic waste but also enhances the toughness of the material during its intended use.
While these developments are promising, it is important to note that most petroleum-based plastics are not readily biodegradable. They are designed to be durable and resistant to degradation, which contributes to their persistence in the environment for extended periods. As a result, the quest for plastic-eating microbes and the development of biodegradable alternatives remain crucial in addressing the global issue of plastic pollution.
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Plastic biodegradation
Biodegradation is the process of breaking down a material into compounds found in nature with the help of microorganisms. However, most petroleum-based plastics are not biodegradable because they are not consumed by microorganisms. This is due to the intrinsic composition and properties of plastics, such as their durability and resistance to degradation. The same characteristics that make plastics functional, such as their stability, low cost, and durability, also make biodegradation challenging.
Despite this, some microorganisms have been found to possess plastic-degrading abilities. For example, bacteria and their enzymes have been shown to play a role in the biodegradation of plastics. The specific mechanisms are still being explored, but research has identified bacterial enzymes such as PET hydrolase and PCL-cutinase, which can degrade different polymers.
To enhance plastic biodegradation, researchers have proposed various strategies, including the use of plastic-eating microbes. For instance, Muhammad Reza Cordova, a marine biologist, is searching for microbes that can break down plastics by collecting samples from water bottles, plastic bags, and plastic foam cups in Indonesia. In addition to microbial-mediated degradation, other methods such as pyrolysis, photodegradation, thermal degradation, and chemical catalytic degradation have been explored for non-biological plastic degradation.
The development of biodegradable plastics is another approach to address the plastic waste problem. Biodegradable plastics are engineered to biodegrade in soil or water, and compostable plastics can be broken down by biological treatment at industrial composting facilities. However, it is important to note that not all biodegradable plastics are compostable, and the term "biodegradable" in marketing has specific time-related requirements.
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Microbial degradation rate
Plastic bags are derived from organic products such as crude oil, natural gas, and coal. The useful breakdown of plastic bags takes more than a thousand years. This is because most petroleum-based plastics are not readily biodegradable. In other words, they are not consumed by microorganisms and returned to compounds found in nature. However, some microorganisms have been found to degrade synthetic plastics.
The rate of microbial degradation of plastics depends on the type of plastic and the microorganisms involved. For example, in an experiment, the microbial degradation rate of polyethylene (PE) was calculated to be in the range of 0.36–0.39% after 2 years. When the polyethylene was extracted with cyclohexane to remove its low molecular weight components, the microbial degradation rate dropped to 0.16%.
The biodegradation rate of polystyrene (PS) by three fungi and three bacteria isolated from soil-buried PS films was quite low, and there was no evidence of changes in the physical or chemical properties of its long-chain molecules after microbial degradation. However, Mor and Sivan (2008) found that an actinomycete, Rhodococcus ruber C208, was able to utilize PS as its sole carbon source, resulting in a weight loss of 0.8% within 8 weeks.
In another example, the transformation rate from PS waste to PHA was 10%. Goff et al. attempted to improve this conversion rate by performing a batch fermentation of P. putida CA-3 grown on styrene oil in a stirred tank reactor with an optimized nitrogen feeding strategy.
The rate of microbial degradation is also influenced by the environment. Plastic-contaminated places are characterized by extreme environmental conditions, such as low or elevated temperatures, acidic or alkaline pH, high salt concentrations, or high pressure. These conditions can affect the degradation ability of bacteria and the efficiency of biodegradation.
Overall, the microbial degradation rate of plastics varies depending on the specific plastic, the microorganisms involved, and the environmental conditions. While some microorganisms have shown the ability to degrade synthetic plastics, the process can be slow and the efficiency varies. Further research and exploration of different microorganisms and enzymes are needed to improve the microbial degradation of plastics.
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Biodegradable plastics
Plastic bags are a common source of pollution, choking beaches, reefs, and forests. They are difficult to recycle and often end up in landfills or the environment, where they can persist for hundreds of years. However, some plastic bags are labelled as 'biodegradable', which means they can be decomposed by microorganisms into water, carbon dioxide, and biomass.
There are two main classes of biodegradable plastics: bioplastics, which are derived from renewable raw materials, and plastics made from petrochemicals with biodegradable additives to enhance biodegradation. Biodegradable plastics are commonly used for disposable items such as packaging, cutlery, and food service containers. They can be foamed into packing materials, extruded, and injection-moulded using conventional machines, and they are also waterproof and can be coloured to match conventional plastics.
However, the effectiveness of biodegradable plastics depends on the waste management system. Many biodegradable plastics are designed to degrade in industrial composting systems, which require well-managed waste systems to function properly. If products made from biodegradable plastics are discarded into conventional waste streams such as landfills or the open environment, they may not break down as intended. For example, compostable plastic bags, utensils, and cup lids often do not break down during typical composting, contaminating other recyclable plastics.
Additionally, some "biodegradable" plastic items only break down into smaller pieces like microplastics, which are not easily biodegradable and can still cause environmental harm. To address this issue, universal standards and a compostable logo have been implemented to guide consumers and give them confidence in a plastic's biodegradability. Nevertheless, the development and use of biodegradable plastics are important steps towards reducing plastic pollution and promoting more sustainable practices.
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Frequently asked questions
Yes, microorganisms can break down plastic bags. However, the rate of degradation is extremely slow and may not be fast enough to support microbial growth.
Microorganisms can break down plastic polymers and obtain energy from them with the help of enzymes.
Scientists and engineers are working on replacing petroleum-based plastics with bioplastics, which can be broken down by microorganisms. Researchers are also searching for plastic-eating microbes in various environments, such as hot springs and beaches, to find solutions to the plastic waste problem.
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