The complete recycling process of e-waste

As a result of technological advances, planned obsolescence, media and storage changes (tapes, CDs, HDs, SSDs), and easier access due to costs decreasing, the amount of e-waste generated worldwide has exploded in recent years. Globally, e-waste is becoming the fastest-growing waste stream due to increasing availability and use of electronics.

Any electronic device that has reached the end of its useful life is considered e-waste. In reality, the majority of items that are labeled "e-waste" are not, since old devices that are no longer desired but still functional (or that can be repaired) can be donated, reused, or refurbished.

Here are some of the types of e-waste.

E-waste includes a broad range of products, with the following most commonly occurring categories:

Small Appliances:-

·       vacuum cleaners

·       microwaving

·       ventilation systems

·       toasters

·       e-kettles

·       electronic shavers

·       scalers

·       calculators

·       sets of radios

·       digital cameras

·       electric and electronic toys

·       electric and electronic tools

·       small medical equipment

·       instruments for monitoring and controlling

A large piece of equipment:-

·       Machines for washing

·       Dryers for clothes

·       Machines for washing dishes

·       Stoves that run on electricity

·       Big printers

·       Photocopiers

·       Photovoltaics

The following equipment is used for temperature exchange:

·       freezers

·       Refrigerators

·       HVAC systems

·       Air conditioners

However, despite the fact that these groups of items are growing by weight, businesses and individuals who are looking for ways to recycle e-waste are more likely to focus on small IT and telecommunication equipment, including cell phones, GPS devices, routers, modems, computers, printers, and telephones. Because of their miniaturization, they are a smaller part of the waste stream, but the circuit boards and batteries inside of them contribute to the many problems e-waste causes.

What are the benefits of electronic waste recycling?

In order to understand how electronic waste is recycled, it's important to understand why. It is possible to offset the negative impacts of waste management while also providing a number of benefits, primarily through recycling.

Across the US, and indeed the world, municipalities are raising awareness of the problem and urging businesses to take greater responsibility for their e-waste disposal. By empowering producers, consumers will have more options for recycling (or reusing) e-waste products.

 

E-waste management today cannot keep up with our consumption, so large-scale recycling of e-waste is essential. We will soon be surrounded by broken electronics unless we improve our management systems.

Problems associated with not recycling electronic waste

When e-waste is not properly managed, toxic chemicals can leak into the ground, air, and water supplies.

E-waste mismanagement can release pollutants such as:

·       Leading

·       Aluminium

·       Phopher

·       Benzene

·       Chromium

·       Plutonium

·       Dioxins containing bromine

·       Aromatic polycyclic hydrocarbons

In particular, heavy metals such as mercury and cadmium can damage ecosystems, build up in food chains, and be harmful directly to humans.

Additionally, in order to manufacture electronics, new natural resources must be mined rather than reusing what is already in the economy. PCBs (printed circuit boards) typically contain precious metals, with gold, silver, platinum, and palladium all present and becoming increasingly difficult to locate. Due to the mining, transportation, and production required to source and extract valuable metals for "disposable" devices, this has a massive ecological impact.

Recycling electronic waste has several advantages:

Alternatively, e-waste can be recycled to recover metals such as gold, copper, glass, aluminum, lithium, and plastic. In 2016, roughly 55 billion euros worth of raw materials were found in e-waste, according to one study. Further, these materials are reused to manufacture new products, reducing their environmental impact, minimizing the release of hazardous materials into the environment, and improving the overall sustainability of the electronics manufacturing process.

Recycling and reuse also have an economic impact, with 681,000 jobs created by recycling and reuse annually. As the fastest growing waste stream, e-waste is likely to become increasingly significant as we become more reliant on digital devices.

 

Here is the process flow chart for recycling e-waste:

Process for recycling e-waste:

Step 1 – Collection:

Electronic products are collected through recycling bins, collection locations, take-back programs, or on-demand collection services as the first stage of recycling e-waste. A special electronics recycler then processes the mixed e-waste.

At this stage of the process, it is advisable to separate e-waste by type, which is why many collection sites have different bins or boxes for different items. Batteries, which require special treatment and can damage other waste if mixed with e-waste, are a particular concern.

Step 2: Storing E-waste:

Although it may seem unimportant, good storage is essential. CRT televisions and monitors, for example, have glass screens that are highly contaminated by lead. Previously, they were recycled into new computer monitors, but the growth of new technology and subsequent decline in demand for CRT products means that most of these glasses are simply being stored indefinitely.

Step 3- Sorting, dismantling, and shredding by hand:

The e-waste is then manually sorted, during which various items (such as batteries and bulbs) are removed for processing. During this process, some items may also be manually dismantled in order to reuse or recover valuable components.

A key part of the process is to shred the e-waste into small pieces, which enables precise sorting of materials. When electronics are broken down into pieces less than a few centimeters in length, they can be separated mechanically.

 

Step 4: Mechanical Separation:

There are actually several processes involved in mechanically separating the different materials. There is magnetic separation as well as water separation.

Separation by magnetic attraction:

Iron and steel are pulled from the mixed e-waste by a large magnet, which passes the shredded e-waste under it. Separating nonferrous metals can also be accomplished by eddy currents. Dedicated recycling plants can then be used to smelt these materials. This stage involves separating other materials, such as plastics with embedded metal and circuit boards.

Separation of water:

Plastic and glass dominate the solid waste stream now, so water is used to separate the materials, followed by further purification for plastic separation and hand-sorting obvious contaminants.

Step 5: Recovery:

Now that all the materials have been separated, they are ready to be sold or reused. Plastics and steel, for instance, can be recycled in another stream. Other materials can be processed onsite and sold alongside usable components in the early stages.