Separation and Sorting Technology - Recycling Inside

Waste separation is the process of separating waste into different elements. Waste sorting can be done manually at the household and collected or automatically separated in materials recovery facilities. Hand sorting was the first method used in the history of waste sorting.

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Separating waste is the innovation of traditional waste collection and disposal. With the growing waste production and deterioration of the environment, it becomes the typical focus on achieving garbage utilization and improving the quality of the living environment.

Waste separation is an essential step before the disposal of waste. The valuable waste can be sorted for recycling and reusing through separation, such as plastics, paper, rubber, bottles, glass, etc. Separation of waste for recycling improves the level of resources utilization and reduces the amount of garbage.

Magnetic separation is separating components of mixtures by using different types of magnets to attract magnetic materials. The process that is used for magnetic separation detaches non-magnetic material from those that are magnetic.

Magnetic separation can be used in different environments and markets, so are magnetic separators used primarily for recovering metal from waste or purifying secondary materials by removing metals. But magnetic separators are also used in electromagnetic cranes that separate magnetic material from scraps and unwanted substances. Magnetic separation is also used in the mining and mineral industry and plays a small role in the food and pharmaceutical industry. For example, to remove metal contaminants from product streams.

How is a magnetic separator used in recycling applications?

A magnetic separator consists of a powerful electromagnet placed or suspended from a ceiling or device. Materials can be passed over a tabletop magnetic separator, while suspended magnetic separators often hover over material to remove imperfections. Magnetic separators can also be cylinders that objects pass through.

In the recycling industry, magnets are commonly used to attract ferrous materials, such as tin, iron, steel, and many more. Magnets are found along assembly lines where they will be placed either above or below the conveyor belts to attract said materials or minerals.

Screening is the most standard form of separating solid waste, depending on its size, by using one or more screening surfaces. Screening has several applications in solid waste resources. Screens can be used before or after shredding and after air separation of waste in various applications. Rotary drum screens and various vibrating screens are the most commonly used screens nowadays.

Selection of screening systems

Screening systems come in many shapes and sizes and provide various sorting solutions. Popular screening systems include the screen drum, trommel screens, mobile screens, vibrating screens, and many more.

The following variables affect the decision of selecting the most appropriate screen:

• Separation efficiency.
• Material specification for screened components.
• Location where screening is to be applied.
• Characteristics of waste material to be screened and the screen design
• Operational characteristics (energy and maintenance requirements, simplicity of operation, reliability, and more.
• Site considerations include space and height access, noise, and environmental limitations.

Sensor-based sorting has become more established in recent years, and it’s commonly used in the mining industry. The benefits of automatic sorting using color, x-ray, or near-infrared sensors are increasingly common in the industry and therefore accepted as the standard process. Mining technologies, like sensor-based sorting, can address the problems the industry now faces, such as water shortages, declining ore grades, and increasing environmental regulations.

Usage of sensor-based sorting technology

Sensor-based sorting has been used in the food processing and waste/recycling industries. In recent years, the mining industry has become more common for sensor-based sorting.

Sensor-based sorting is used for particle sizes ranging between 0.5 to 300 mm and is completed before applying fine comminution and chemical processing techniques. The goals are to remove waste before production and recover the usable ore.

Robotic recycling sorting uses artificial intelligence (AI) and robotics to sort plastics, so humans don’t have to. With advanced cameras and technology, these companies count on robots to sort recycling.

How does robotic sorting work?

Cameras and high-tech computer systems trained to recognize specific objects will include the robotic components over conveyor belts to reach their target. Sensors attached to the arms can detect and interact with cans, glass, plastic containers, and any other recyclable items out of the otherwise garbage and place them in their respective bins.

Advantages of robotic recycling include:

• Reduced reliance on manual sorters, therefore, more reliable
• Increased agility and accuracy
• Improved knowledge
• Advantages of AI
• Quality control

Color sorters (often called optical sorters, digital sorters, or electronic color sorters) are sorting machines used on the production lines in bulk food processing and many other industries. They separate items by their colors, detecting the colors of things that pass before them.

Color sorters are primarily used in sorting grain (agricultural products), and the rice sorting industry is the first big market. Color sorters are also used for the food processing industry, such as coffee, nuts, and oil crops. Colour sorters are also found in the mining industry, more specifically, the diamond industry.

Color sorting in the recycling industry

In the recycling industry, the color sorter can distinguish between colored and colorless PET and HDPE flakes and separate flakes by color. Plastic color separators are used to separate mixed-color plastic flakes or particles, and Plastic-type separators separate plastics of the same color but different materials.

NIR sorting is the industry’s preferred plastics sorting technology because it can accurately identify the many different polymers already in use today. NIR technology is also widely used to recover valuable materials from streams in the waste industry.

The minerals industry offers various fields of application for NIR spectroscopy, and NIR spectroscopy can be implemented as offline laboratory analysis and online process control. In both cases, the well-known characteristics, namely: short analysis time, non-destructive, easy sample preparation, relatively low cost) are the best reasons for using NIR spectroscopy in the minerals industry.

Benefits of NIR

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NIR sensors have already been proved to be efficient in the mechanical sorting of plastics in sorting facilities and the mineral industry. They are also an affordable option, as the development of MEMS technology has resulted in very cost-effective NIR solutions.

Putting the right practices in place can help you make sure you’re efficiently tackling waste removal, improving your environmental impact, and saving on costs.

1. Reduce waste

The first step towards more sustainable waste management practices is to cut back on the amount of waste you create. This means prioritising equipment and materials that you’ll use again and again, avoiding single-use products, and ensuring you only order items and materials you’ll actually use.

2. Implement cloud-based waste management software

Use waste management software to analyse your real-time data and gain new insights into areas like waste generation, removal, and recycling. This software can help illuminate where resources are being wasted, recycling practices are falling short, and inefficiencies lie.

For example, you can use cloud-based software to track real-time waste levels and set up automated alerts on when bins need to be emptied. This type of software can also reduce costs by helping you reduce unnecessary hauls.

You can also use waste management software to help make sure you’re segregating and removing waste in accordance with legislation, helping you reduce your risk of fines and reducing your environmental impact. Find out more about how cloud-based waste management software can help you optimise your processes.

3. Support on-site waste segregation

80% of companies don’t offer separate recycling for recyclables and non-recyclables, even though it costs up to £103.70 per tonne sent to landfill. Incorporating on-site waste segregation practices is one of the best ways to reduce your environmental impact and cut costs.

Put clear procedures and infrastructure in place to support appropriate waste segregation. This means providing on-site bins or disposal units for different waste streams such as recyclable, non-recyclable, and hazardous waste.

Make it easy for employees to engage in waste segregation by sharing your company's recycling and waste removal policy and providing clear labelling and colour coding for different types of bins or waste disposal units.

4. Repurposed materials and equipment

One of the best ways to improve industrial waste management is to reuse and repurpose your materials and equipment. By doing so, you can make more efficient use of scrap materials and equipment, saving money, improving efficiency, and saving time.

For example, you can melt metal and reuse it rather than forging new metal, saving energy and expense. A number of companies recycle non-hazardous waste such as oil filters, containers, and industrial transformers. While recycling one tonne of paper can save 17 trees.

You can set up on-site recycling facilities or request the help of a recycling partner (more on that below).

5. Choose the right partners

Waste disposal doesn’t just fall on your company alone, make sure you’re partnering with licensed, reputable waste management and recycling companies. These companies can help remove, purify, repurpose, or dispose of both hazardous and recyclable waste for you.

In addition, you can also enter into partnerships with other companies in which you trade materials that aren’t of use to you but that the other company can use in their work. For example, plastics, metals, paper, or other waste materials may be valuable to another business.

6. Optimise your processes

By implementing process optimisation, you can reduce the amount of waste you create. For example, many businesses with eco-friendly waste management practices utilise lean manufacturing principles.

A great example of this is a just-in-time inventory which involves only ordering as much inventory as you need, rather than stocking up. This can help you both cut storage costs and avoid potential waste.

7. Invest in employee training

Investing in ongoing employee training is essential for keeping employees aware of and engaged in best practices and ensuring they are confident engaging with your waste removal processes and technologies. Employee training can improve employee engagement, promote critical thinking, and ensure employee safety.

8. Request a regular waste audit

Improve recycling rates and waste segregation in your business by requesting a regular waste audit.

A waste audit involves bringing in an external expert who can help you clearly differentiate your commercial and industrial waste, review your current waste removal practices, and provide guidance on more efficient internal waste removal, segregation, and residual and recycling practices.

Beyond helping to deliver greater efficiency, a waste removal expert can provide cost-saving advice as well as guidance on how to make your practices greener.

9. Stay up to date with changing regulations

Regulations can change quickly in the waste removal space. Non-compliance can potentially lead to hefty fines. The U.K. government has previously introduced unlimited penalties for companies that pollute the environment.

To make sure you stay up to date with new regulations, regularly review the government website and subscribe to industry publications. Another wise idea is to consult an environmental compliance professional who can review your processes and offer specialised advice.

10. Embrace automation

Automated collection and sorting systems and competitors can help improve efficiency and safety, reduce human error, conserve energy, and save time. Take AI-powered robots that can identify and sort different waste materials, recycle and repurpose materials quickly and efficiently, and dispose of hazardous materials safely.

Bonus Tip: Stay informed about industry trends

Just as industry regulations are always in flux, new waste management trends and interesting innovations are making their way into the waste management industry.

To make sure you’re aware of the latest technologies and innovations, subscribe to industry publications. Don't shy away from attending industry events to find out more about what’s new in the industry and hear from waste management experts across the sector. Such events also give you the chance to network with peers and learn from their approaches.

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