Chloe Zhang
Recycling plastic is an important way to help the environment, as it takes between 100 and 1000 years for plastic to decompose in a landfill. There are several ways to get paid for recycling plastic, such as selling plastic bottles to recycling centres, or through online platforms and specialised companies. Some states have bottle bills, which allow people to make money from recycling plastic bottles. However, it is important to note that the price per pound of plastic fluctuates according to the market. Aside from plastic, there are other items that can be recycled for money, such as aluminium cans, cardboard boxes, and electronics.
How do we get money for recycling plastic?
| Characteristics | Values |
|---|---|
| Return plastic bottles to recycling facilities and stores | Varies from 5p to 10p coupons or in-store vouchers |
| Sell plastic bottles on eBay or Amazon | Wine bottles can be sold for up to £29.99 for a box of twenty-four |
| Recycle plastic at Cash for Cans centres | Get paid between 40p and 60p per kilo of cans |
| Recycle plastic at collection sites, waste depots, and recycling centres | N/A |
| Recycle plastic at special collection events | N/A |
| Recycle plastic at stores involved with e-waste recycling | N/A |
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What You'll Learn
Plastic waste collection
Collection Techniques
Residential and Commercial Collection
Plastic waste is typically collected from homes, businesses, schools, and other institutions by government or private waste collectors. This waste can be collected through kerbside collection services, where local authorities or waste management contractors collect household recycling on a weekly or bi-weekly schedule. Alternatively, residents can drop off their plastic waste at designated collection points, such as recycling centres or stores that accept specific types of plastic for recycling.
Sorting and Separation
After collection, plastic waste undergoes sorting and separation based on various factors. Plastic types are identified and separated using methods like Near-Infrared (NIR) sensors, which can detect the NIR spectral images of different plastics. Additionally, plastics are sorted by colour, thickness, and usage. This sorting process can be done manually or through automated machines at recycling plants.
Washing and Shredding
Once sorted, the plastic waste undergoes a washing process to remove impurities, including product labels, adhesives, and food residue. This step is crucial to prevent contamination and ensure the plastic can be effectively recycled. After washing, the plastic is shredded into smaller pieces, which can be used as raw materials or additives and also facilitate the removal of additional impurities.
Recycling and Repurposing
The shredded plastic is then sent to specialised recycling centres, where it undergoes further processing. It is cleaned, melted down into pellets, and then used to manufacture new products. This recycling process prevents soft plastics from ending up in landfills or oceans, protecting wildlife and the environment.
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Sorting and identification
Sorting Plastics
The first step in sorting plastics is to separate them into different streams or categories. This separation is necessary because different plastics have different melting points, densities, and chemical compositions, which affect how they can be recycled. For example, PVC, often used in pipes and packaging, is challenging to recycle due to its chemical composition. Mixing PVC with other plastics, such as PET, can cause dangerous chemical reactions, leading to the release of harmful acids or toxic dioxin emissions. Therefore, accurate sorting is essential for safety and to prevent contamination.
Identification Techniques
Automated sorting systems play a significant role in identifying and sorting plastic items. These systems use advanced technology, including sensors, optical scanners, and pneumatic systems, to identify and categorize plastics based on their unique attributes. The sensors analyze factors such as density, colour, and behaviour when exposed to specific wavelengths of light. Once a specific type of plastic is identified, pneumatic systems use air jets to divert the plastic items into their respective collection bins, keeping the process efficient and streamlined.
While automation has improved accuracy, manual intervention is still necessary for irregularly shaped or unusually coloured plastic items that pose a challenge for the sensors. Skilled workers step in to ensure correct sorting decisions are made, and they also identify and separate non-recyclable plastics.
Technological Advancements
To further enhance sorting and identification processes, several innovative technologies are being developed:
- Fluorescent Markers: The Prism project, a UK consortium, has developed fluorescent markers that provide unique signals to sorting equipment, allowing for the identification of various polymers and multi-layer packaging. These markers can be used alongside NIR (near-infrared) technology to distinguish between different polymer streams and identify black plastics, which are usually invisible to NIR systems.
- NIR-Detectable Pigments: Nextek has created NIR-detectable pigments as an alternative to carbon black used by manufacturers. This innovation allows sorting systems to detect and recycle plastics that were previously difficult to identify.
- Digital Watermarks: The European HolyGrail project introduces the concept of invisible codes stamped onto the surface of items. Cameras on the sorting line can detect these codes, providing information about the packaging material. Dutch company Filigrade is working on one such watermark, claiming a 98% accuracy rate.
Data Sheets and Specifications
For industrial-scale plastic recycling, providing detailed data sheets and technical specifications to the recycling company is essential. These specifications include information such as Melt Flow, Resin Number, Extrusion or Injection Grade, Izod, and Durometer, ensuring the recycling company has all the necessary details to process the plastic materials effectively.
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Separation methods
The separation of plastics is a crucial step in the recycling process, as different plastics have distinct properties and resin types. Here are some methods used to separate plastics for recycling:
Automated Sorting Systems
Modern recycling relies heavily on technology, with automated sorting systems playing a central role. These systems utilize sensors and optical scanners to identify and categorize plastic items based on their unique attributes. Factors such as density, colour, and behaviour when exposed to specific wavelengths of light are analysed to sort the plastics accurately. This technology enables high-speed and precise sorting, revolutionizing the recycling process.
Manual Intervention
While automated systems have improved sorting accuracy, manual intervention is still necessary in certain cases. Skilled workers are crucial in sorting irregularly shaped or unusually coloured plastic items that might confuse the sensors. Additionally, they ensure that non-recyclable plastics, such as PVC, are identified and separated from the recyclable stream. PVC, commonly used in pipes and packaging, poses recycling challenges due to its chemical composition.
Density Separation
Another method for separating plastics is by density, which is measured by comparing the mass per unit volume. Commercial firms often use the floatation technique, where heavy plastics sink in a brine (salt) solution, while lighter ones float, facilitating easy separation. Different brine solutions can be used to separate a variety of plastics.
The combination of automated systems, manual labour, and density separation techniques ensures that plastics are accurately identified, sorted, and prepared for the recycling process. These separation methods contribute to the efficient recycling of plastic waste, giving it a second life.
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Shredding and washing
Shredding is the process of breaking down plastic waste into smaller pieces. This step is essential as it reduces the plastic items into manageable sizes for further processing. The shredded plastic can then be sorted further to separate different types of plastic. There are various methods to shred plastic, depending on the technology available. In advanced facilities, plastic is shredded mechanically into flakes of similar size, which can then be washed and further processed.
Washing the shredded plastic is an important step to ensure the final recycled product is safe and clean. The washing process helps remove contaminants such as dirt, residue, and other impurities from the plastic. This step is particularly important as plastic waste often contains harmful chemicals and toxins that need to be eliminated before the plastic can be reused.
The washing process can be done in various ways, depending on the type of plastic and the technology available. One common method is to use a wet process known as a sink-float separator. In this process, a tank is filled with water, and the shredded plastic is added. The high-density plastic sinks, while the low-density plastic floats, allowing for easy separation. This process not only helps in washing the plastic but also further sorts the plastic by density.
After shredding and washing, the plastic undergoes further processing, such as melting and extrusion, to form pellets or other recycled products. It is important to note that the recycling process can vary depending on the specific facility and the type of plastic being recycled.
While shredding and washing are essential steps in plastic recycling, they are just a part of the complex process of giving plastic waste a new life. Plastic recycling helps reduce our dependence on landfills, conserve resources, and protect the environment from plastic pollution and greenhouse gas emissions.
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Reprocessing and manufacturing
Plastic recycling is the process of turning plastic waste into other products. This process can reduce the need for landfills, conserve resources, and protect the environment from plastic pollution and greenhouse gas emissions. Recycling rates for plastic are low compared to other materials, with only around 9% of plastic waste being recycled globally.
Once plastic waste has been collected from homes, businesses, and recycling centres, it is sent to Material Recovery Facilities (MRFs) or Plastic Recovery Facilities (PRFs). Here, the plastic is sorted by type using methods such as sink/float separation or Near-Infrared (NIR) scanning. Plastic with different resin codes or resin numbers, which indicate the type of plastic, are often recycled separately.
After sorting, the plastic is washed, shredded into smaller pieces or flakes, and then melted and extruded into pellets. This process is known as reprocessing. The pellets, or recyclate, are then purchased by manufacturers to be incorporated into new products.
To increase the percentage of plastic that can be fully recycled, manufacturers can minimise mixing packaging materials and eliminate contaminants. The Association of Plastic Recyclers has issued a "Design Guide for Recyclability" to improve the recyclability of plastic products. Designers, brands, and retailers can also play a role by creating products that can be easily and effectively recycled and by incorporating recycled plastic into their designs.
Some examples of products made from recycled plastic include decking, food storage containers, playground equipment, and clothing made from plastic bottles. Consumers can also play a role in increasing recycling rates by seeking out products made from recycled plastic and properly separating and disposing of their plastic waste.
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Frequently asked questions
Start by collecting plastic bottles and taking them to your nearest supermarket. Many supermarkets have recycling initiatives that give you money or coupons in exchange for plastic bottles.
In the UK, Sainsbury's, Iceland, Tesco, and Morrisons are some of the supermarkets that offer these incentives. For example, Sainsbury's gives you a 5p coupon for each bottle, while Iceland and Tesco offer a 10p coupon. Morrisons provides 100 Morrisons More Points for every bottle returned, up to a maximum of 20 bottles per day.
Yes, you can explore options beyond supermarkets. Some retailers like H&M and Marks and Spencer offer vouchers for your recycled items. Additionally, you can sell your recyclables on online platforms such as eBay.
Different types of plastic may have varying values, but it's important to note that the recycling process itself can be complex and costly. Low-density polyethylene plastics are commonly recycled, and some recycling centers specialize in this type of plastic.
