Chloe Zhang
Aluminum and plastic are two of the most common materials that end up in landfills. While aluminum can take over 100 years to decompose, plastic items can take anywhere from 500 to 1,000,000 years to fully decompose. This stark difference in decomposition rates is due to the inherent properties of the materials and the way they interact with the environment. Aluminum, for example, is sensitive to acidic substances, while plastic does not easily break down through biodegradation.
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What You'll Learn
Aluminum cans take 100 years to decompose
Aluminum is a highly recyclable material, and it can be recycled infinitely without any loss in quality. Recycling aluminum cans can result in them being back on the shelf in as little as six weeks. However, when aluminum ends up in landfills, it can take over a century to break down. This is due to the specific properties of aluminum, which oxidizes easily and is protected by an oxide layer that prevents corrosion.
On the other hand, plastic is not easily biodegradable. It can take anywhere from 500 to 4000 years for plastic to break down, and this process is dependent on factors like sunlight and oxygen availability. While some biodegradable plastics exist, they still require specific conditions, such as industrial compost, to degrade effectively.
The significant difference in decomposition rates between aluminum and plastic underscores the importance of recycling and proper waste management. While aluminum is highly recyclable, plastic can be re-processed several times before it starts to break down. Nevertheless, the sheer volume of plastic produced and discarded, coupled with its resistance to biodegradation, poses a severe environmental challenge.
To summarize, aluminum cans and plastic both have long decomposition times, but aluminum decomposes much faster than plastic. Recycling is crucial for minimizing the environmental impact of these materials, and proper waste management strategies are essential to address the challenges posed by their decomposition rates.
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Plastic takes over a million years to decompose
Plastic is an incredibly useful material, but it is also incredibly harmful in terms of the waste it creates. Plastic is designed to last for decades, if not hundreds of years. It has only been in circulation since 1907, and experts estimate that some plastics can last hundreds of years before they finally break down.
The decomposition of plastic depends on several factors, including the type of plastic, the environment it is in, and the presence of microorganisms that can break it down. Most scientists agree that plastic can take anywhere from 20 to 500 years to decompose, and even then, it never fully disappears; it just gets smaller and smaller. The plastic in coffee pods, for example, takes more than 500 years to break down, and during this process, harmful amounts of methane gas are released.
The longevity of plastic in the environment is a significant issue, as plastic waste can be found everywhere, from the peaks of mountains to the depths of the oceans. It has been estimated that humans ingest a credit card's worth of plastic per week, and plastic pollution has increased so much that it is now affecting both the environment and livelihoods.
To address the problem of plastic waste, it is essential to reduce plastic consumption, recycle or reuse plastic products, and support innovations such as plant-based plastics or plastic-eating bacteria that can break down plastic waste more efficiently.
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Plastic coating is added to aluminum cans containing acidic drinks
Aluminium cans take around 100 years to decompose, while plastic can take over a million years. This is because microorganisms cannot digest plastic. However, plastic coatings are added to the interior of aluminium cans containing acidic drinks, such as Coke, to prevent the acid from eating away at the oxide and eventually the can. Without this coating, the drink would decompose the can in just three days.
The plastic coating, made from epoxy, is typically only a few microns thick and is designed to be affordable, sprayable, curable, strong, flexible, and sticky. It costs about half a penny per can. The formula for the coating is proprietary and specific to the type of food or beverage the can will hold. For example, coatings for tomatoes must be stain-resistant, while those for fish must resist sulfur. There are even specific coatings for chocolate and meat.
The process of creating the epoxy coatings involves using a cross-linking resin, curing catalysts, and additives to give the coating colour or clarity, lubrication, antioxidative properties, flow, stability, plasticity, and a smooth surface. The resin can be epoxy, vinyl, acrylic, polyester, or oleoresin, and could even be styrene, polyethylene, or polypropylene. The mixture also requires either a solvent or a photo-initiator to cure the epoxy through baking or exposure to ultraviolet (UV) light. The most common cross-linking agent for epoxy coatings is bisphenol-A, or BPA.
While the plastic coating helps to extend the life of the aluminium can, it is important to note that the can and the coating will eventually decompose, especially if they end up in a landfill. In landfills, the lack of oxygen can hinder the decomposition process, causing materials to take significantly longer to break down.
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Plastic decomposition requires oxygen, which is lacking in landfills
Decomposition of plastic requires oxygen, which is often lacking in landfills. Landfills are commonly used as a method for disposing of plastic waste, with 79% of all plastic produced ending up in landfills or the environment. However, the lack of oxygen in landfills can significantly slow down the decomposition of plastic.
Oxygen is essential for the microorganisms that break down organic matter through biodegradation. While plastic is not biodegradable, it can still be degraded through other processes such as oxidation and hydrolysis. Oxidation, in particular, is a critical step in the biodegradation of certain plastics like PE, which make up the majority of landfill plastic waste.
The depletion of oxygen in landfills can hinder these degradation processes, causing plastics to persist for much longer than they would on the surface. This is further exacerbated by the absence of UV light and the use of tarps that cover landfills, which further reduce oxygen availability. As a result, plastic waste can remain in landfills for hundreds or even thousands of years.
In contrast, aluminum cans take around 100 years to decompose, even in landfill conditions. This highlights the significant difference in decomposition rates between aluminum and plastic, with plastic taking much longer to break down. While both materials can be recycled, the faster decomposition of aluminum means it has a relatively lower impact on the environment when disposed of improperly.
To address the issue of plastic decomposition in landfills, interventions such as recycling, energy recovery, and reducing plastic consumption have been proposed. However, the implementation of these strategies has been limited, especially in developing countries, due to a lack of technical and economic resources. As a result, the problem of plastic accumulation in landfills persists, underscoring the importance of proper waste management and the need for more sustainable solutions.
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Aluminum is easily recycled
Aluminum is one of the most recycled and recyclable materials in use today. Aluminum is infinitely recyclable, and recycling it can be done with a closed-loop process. This means that a recycled aluminum beverage can, car door, or window frame can be recycled directly back into itself, and this process can happen indefinitely.
Aluminum is composed of atoms bonded together in a crystal structure, which makes it easy to melt and reform into a solid state without changing its fundamental properties. This is in contrast to plastics, which are polymers composed of very large molecules that break down when mechanically recycled. Traditional recycling methods will degrade plastics to the point that they are no longer recyclable into new plastic.
The process of recycling aluminum begins with the collection and sorting of aluminum scrap from various sources. Scrap aluminum comes primarily from either manufacturing scrap or end-of-life aluminum products such as vehicles, building materials, and consumer products. Once collected, the scrap is sorted based on factors like alloy type, grade, and impurity levels. Sorting may be done manually or using technologies like eddy current separators, air classifiers, and density separators. After sorting, the scrap may undergo pre-treatment processes such as shredding, crushing, and granulating to prepare it for melting. The scrap is then melted and undergoes liquid metal treatment to produce refined aluminum alloy suitable for casting or reprocessing. Different furnace types are used based on the type of scrap, desired metal quality, and economics.
The ease of recycling aluminum has made it appealing to companies looking to demonstrate a commitment to sustainable manufacturing. For example, companies like Coca-Cola, Pepsi, and Apple are now using recycled aluminum in their products. Additionally, increased recovery and recycling of aluminum are essential to industry-wide decarbonization, as each percentage increase in the end-of-life recycling rate reduces the carbon intensity of aluminum beverage can production.
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Frequently asked questions
Yes, aluminum decomposes faster than plastic. A single aluminum can takes 100 years to decompose, while a plastic bottle can take 4000 years, with most estimates being around 500 years.
The decomposition rate depends on various factors, such as the material's thickness, the presence of microorganisms, oxygen availability, and temperature. Aluminum is also more easily recycled than plastic, which can only be reprocessed a limited number of times.
Exposing plastic to a warm, wet environment can encourage faster decomposition as it provides the necessary conditions for microorganisms to break down the material. However, too much water can drive out air from the material, hindering the decomposition process.
