Chloe Zhang
Plastic is a highly versatile material that we use a lot of. However, only about 16% of plastic waste is recycled into new plastics, with the rest going to landfill, incineration, or being dumped. This is due to a variety of factors, including inefficient systems, the complexity of recycling different types of plastics, and a lack of awareness about how to recycle properly. To prepare plastic for recycling, it is important to understand the recycling symbols on plastic packaging, which indicate the type of plastic and how to recycle it. Sorting plastics based on these symbols is crucial, as different plastics have varying processing needs, such as different melting temperatures. After sorting, plastics are typically cleaned, shredded, melted, and remoulded into new products. However, chemical recycling, which breaks down plastics into their chemical building blocks, is emerging as an alternative to conventional mechanical recycling.
| Characteristics | Values |
|---|---|
| Plastic types | PET, HDPE, PETE |
| Plastic symbols | 7 plastic recycling symbols |
| Plastic items | Bottles, containers, bags, film, styrofoam, cups, detergent jugs, salad bags, food containers, pouches, bread bags, etc. |
| Plastic preparation | Rinse, clean, cut, separate |
| Plastic recycling process | Sorting, shredding, melting, remoulding, chemical recycling, pyrolysis, distillation |
| Plastic recycling challenges | Low recycling rate, contamination, lack of awareness, inefficient systems, complexity of different plastic types, mixed-material items |
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What You'll Learn
Plastic waste recycling
Firstly, it is important to understand the different types of plastic and their respective recycling processes. Plastic packaging often contains symbols that indicate the type of plastic and how it can be recycled. These symbols provide information on the specific processing criteria, such as different melting temperatures, and the products that the plastic can be recycled into. Understanding these symbols aids in effectively segregating plastics and ensures they are recycled correctly.
The next step in the plastic waste recycling process is the collection of plastic materials. Collectors from the government or private companies gather post-consumer plastic waste from various sources, including homes, schools, and other institutions. After collection, the plastic waste is sorted and grouped into their respective types. Sorting can be done mechanically or by hand, and it is important to ensure that all contaminants are removed.
Once sorted and cleaned, the plastic waste undergoes further processing. This stage involves shredding the plastic into flakes or melting it to form pellets or "nurdles." These shredded or melted plastics are then ready to be moulded into new products.
It is worth noting that not all plastic waste is suitable for recycling. Compostable plastics, for example, should not be mixed with non-compostable plastics as they can contaminate the recycling stream. Additionally, some plastic products are made from a combination of different plastics or materials, which can be challenging to separate and may not be accepted by all recycling facilities.
To prepare plastic waste for recycling, individuals can take several steps. Reusing and repurposing plastic items is a great way to extend their life and reduce the need for new plastic production. When it comes to recycling, understanding the local guidelines and accepted materials is crucial. Checking with local recycling providers or visiting websites like Earth911 can help determine which plastics can be recycled and where to drop them off if they are not accepted in curbside recycling. Before placing plastic items in the recycling bin, it is recommended to give them a quick rinse to prevent contamination, but over-washing can be a waste of time and water.
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Mechanical recycling
The first step in mechanical recycling is the collection of plastic waste from various sources, such as curbside pickup from residences, businesses, schools, and local recycling centres. At this stage, some initial sorting of plastics may occur, separating them from non-plastic materials. The collected plastic waste is then transported to dedicated facilities for further processing.
Once the plastic waste arrives at a recycling plant, it undergoes a comprehensive sorting process. This stage involves both human and machine sorting to separate different types of plastics based on their recycling codes. Plastics are sorted by colour, thickness, and type, ensuring they are properly grouped for the next steps in the recycling process.
After sorting, the plastics are mechanically shredded or ground into smaller, more manageable pieces, often referred to as plastic flakes. This size reduction facilitates the removal of contaminants and prepares the plastic for further processing. The shredded plastic is then thoroughly washed to eliminate dust, dirt, food residue, drink residue, labels, and any unpleasant odours that may have been picked up during its previous life.
Following the washing stage, the clean plastic flakes undergo controlled sorting once again to ensure they are correctly grouped. Finally, the sorted plastic flakes are sent for extrusion, where they are melted and moulded into new recycled plastic pellets. These pellets are then sold to manufacturers for use in creating a variety of new products.
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Chemical recycling
One of the most prominent methods of chemical recycling is pyrolysis, which involves heating plastics to high temperatures in an oxygen-free environment. This process breaks down long polymer chains into short-chain hydrocarbons like diesel and naphtha. The resulting pyrolysis oil is a liquid mix of various compounds, including olefins, which are simple hydrocarbons that serve as building blocks for today's chemicals and polymers. Pyrolysis is most effective for handling a mixture of polyethylene and polypropylene and is currently mostly focused on fuel production. However, chemical companies are optimistic that more firms will use the process to create naphtha, which can be transformed into petrochemicals and plastics.
Another chemical recycling method is depolymerization, which breaks down polymers into monomers or shorter polymers called oligomers. These can then be used to create high-quality recycled polymers that are identical to the originals, eliminating downcycling. However, depolymerization currently only works for condensation polymers like polyethylene terephthalate (PET) and not for addition polymers like PP, PE, and PVC.
Solvent-based purification is another chemical recycling technique that uses solvents to remove additives or contaminants, such as plasticizers, leaving only the polymer. However, this method is not considered perpetual due to the risk of remaining contaminants and the loss of polymer properties caused by solvent damage. Additionally, the high energy consumption required to remove solvents after purification creates time and cost barriers to scaling this process.
Hydrothermal treatment (HTT) is a newer chemical recycling technology that uses water to heat and dissolve mixed plastics under supercritical conditions without direct combustion. This process produces higher yields than pyrolysis or gasification and avoids the toxic combustion products associated with pyrolysis.
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Recycling collection
Recycling plastic is essential for the health of the planet. However, it can be a challenging process due to the variety of plastic types and the inefficiency of current systems. To prepare your plastic for recycling collection, there are several steps you can take to ensure your waste is recycled correctly and efficiently.
Firstly, it is important to understand the different types of plastics and their specific recycling needs. Most plastic products will have symbols on their packaging, which indicate the type of plastic and provide instructions for recycling. These symbols are key to understanding how to recycle an item correctly. For instance, some plastics are compostable and should not be placed in a dry recycling collection or garden waste bin.
Once you have identified the type of plastic, you can check with your local recycling provider to see if they accept that particular type. You can do this by contacting your local government or using an online recycling locator tool. Many local authorities now offer collection facilities for plastic bottles, and an increasing number also collect mixed plastics packaging, such as pots, tubs, and trays. Retailers and grocery stores may also accept certain materials for recycling, such as plastic bags, wrappings, and soft plastics.
Before placing your plastic items in the recycling bin, it is important to ensure they are clean. Giving your plastic bottles or containers a quick rinse will prevent contamination to other recyclable items. However, it is not necessary to ensure they are spotless, as this can be a waste of time and water.
Finally, you can prepare your plastic for recycling by separating it into different types, if your local program requires this. This step may be done at the sorting facility, either mechanically or by hand, but it is always best to check.
By following these steps, you can ensure your plastic waste is correctly prepared for recycling collection, contributing to a more sustainable future.
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Recycling sorting
Plastic is one of the most popular and versatile materials, with over 380 million tonnes produced worldwide every year. However, only 16% of plastic waste is recycled to make new plastics, with the rest going to landfill, incineration, or being dumped.
Recycling and reusing plastic is essential for the health of the planet, and the first step is deciding to recycle. The next step is to ensure that the items are recycled correctly. Sorting plastic for recycling can be done at home, by taking items to a recycling centre, or through household recycling collections.
Sorting at Home
Plastic items can be sorted at home by checking the symbols on the packaging. These symbols indicate the type of plastic and how to recycle them. Some plastics are compostable and should not be put in with dry recycling collections or garden waste bins. It is important to check with your local recycling provider to learn which items they accept.
Taking Items to a Recycling Centre
Many local authorities now offer collection facilities for plastic bottles and other plastic packaging at Recycling Centres. Again, it is important to check which types of plastic your local authority collects.
Household Recycling Collections
Most plastic bottles are made from PET or HDPE, which are easy to recycle. These can usually be put out with your household recycling for collection. Once collected, the rubbish is sorted, either mechanically or by hand, into different kinds of materials and plastics.
Sorting Process
The sorting process involves several steps. First, the plastic is segregated based on density, with testing done by floatation on water. The next step is air classification, where the plastic is categorized based on thickness. Thinner pieces float, while thicker ones stay at the bottom. Finally, the plastic is crushed and melted to form pallets, which are then transformed into a new shape to make a new product.
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Frequently asked questions
Plastic bottles can be reused to make cups for storing pens and craft supplies, or as a planter for plants.
Symbols on plastic packaging can help explain which type of plastic they're made of and how to recycle them. Each of the seven plastic recycling symbols provides distinct recycling instructions.
Rinse the plastic with water to prevent contamination to other recyclable items. Check with your local recycling provider to learn if they accept the items.
Plastic bottles are usually made from two types of plastic that are easy to recycle - PET and HDPE. Many local authorities offer collection facilities for these plastic bottles.
Plastic is usually recycled mechanically, and each time its quality is degraded. The new, lower-grade plastic often becomes unsuitable for use in food packaging. Many products are made from a combination of plastics or a mix of plastics and other materials like metal or wood, which cannot be processed in most recycling facilities.
