E-waste, also known as electronic waste, refers to discarded electrical or electronic devices. E-waste typically includes items such as computers, cell phones, televisions, and other electronic equipment that have reached the end of their useful life. Because many of these items contain materials that are hazardous to the environment and human health, it is important to properly dispose of e-waste to prevent it from polluting the air, water, and soil.
There is a total of 54 EEE (Electrical and Electronic Equipment) product categories that are grouped into 6 general categories depending on their waste management characteristics:
EEE may contain up to 69 elements from the periodic table including precious metals like gold, silver, platinum, palladium, and many others. A large part of the e-waste is critical raw metals like cobalt, indium, germanium, bismuth, and antimony, as well as non-critical metals like aluminum and iron.
For example, the concentration of gold in mobile phones and personal computers can be relatively high, reaching 280 grams per ton of e-waste. (2)
The majority (about 32% or 17.4 Mt) of e-waste generated in 2019 comprised small equipment like vacuum cleaners, microwaves, toasters, electric kettles, video cameras, radio sets, electrical tools, small medical devices, monitoring equipment, and other kitchen and consumer electronic equipment.
The runner-up (about 24% or 13.1 Mt) was e-waste from the large equipment category that includes items like washing machines, driers, stoves, etc. (2)
Currently, e-waste represents about 2.7% of the total waste produced globally.
The world generates about 2 billion tonnes of waste annually out of which 53.6 Mt in 2019 was e-waste. (2,17)
Based on the recent stats, in 2019 China generated 10.1 Mt of e-waste which makes it the biggest contributor of electronic waste in the world. This amounts to about 19% of the total e-waste generated in the world.
The reasons for that are the concentration of EEE manufacturing in the country, as well as the large domestic population which creates a lot of local demand for electronics. (2)
In 2019 Asia generated the most e-waste (24.9 Mt), followed by the Americas (13.1 Mt) and Europe (12 Mt).
While in absolute numbers Asia is the biggest e-waste contributor, Europe is ranking first in terms of e-waste generated per capita. (2)
African countries generate the least e-waste. Countries like Burundi, Central African Republic, Guinea-Bissau, Malawi, Mozambique, Niger, and Sierra Leone each generated only 0.5 kg of e-waste per capita in 2019. (2)
Based on the statistics available, in 2018 China recycled 1546 kt of e-waste. China put in place legislation enforcing recycling collection and treatment of 14 various types of e-waste.
The country also set targets of sourcing 20% of raw materials for new EEE to come from recycled materials and recycle 50% of electronic waste by 2025. (2)
The world’s e-waste grew by 9.2 Mt between 2014 and 2019 and is projected to grow to 74.7 Mt by 2030.
With collection and recycling growing only 1.8 Mt between 2014 and 2019 rate at which we generate electronic waste significantly outpaces the recycling rate. (2)
The growth of e-waste has been a growing concern in recent years, as the demand for electronic devices continues to increase and the lifespans of these products continue to decrease.
According to recent estimates, the market is projected to grow to about USD 145 Billion by 2030 at a CAGR of 13.2%. (7)
Factors like economic growth, population increase, rapid urbanization, and as a result increase in demand for consumer electronics are a few of the factors leading to the fast growth of e-waste. Few repair options and the short life cycle of products are also significant contributors to the e-waste generation.
The amount of e-waste the world generates is estimated to grow to 74.7 Mt by 2030 – almost doubling since 2014. (2)
Temperature exchange equipment e-waste is growing at the fastest rate (7% per year on average), followed by large equipment (5% per year on average), and lamps and small equipment (4% per year on average).
This growth is attributed to the economic development of lower-income countries and increased consumption of household items. (2)
Several toxic additives and substances are contained in the e-waste. These include mercury, brominate flame retardants (BFR), chlorofluorocarbons (CFCs), or hydrochlorofluorocarbons. Improper collection and recycling of these materials poses significant risks to human health and the environment. Based on the Global E-waste Report, a total of 50 t of mercury and 71 kt of BFR plastics are found in globally undocumented flows of e-waste annually.
In addition to this, improper handling of e-waste also contributes to the global warming problem. 98 Mt of CO2-equivalents (or 0.3% of global emissions in 2019) were released into the environment because of improperly discarded fridges and air conditioners. (2)
Electronic waste contains hazardous substances, usually heavy metals such as mercury, cadmium, or lead, and chemicals such as chlorofluorocarbons (CFCs), hydrochlorofluorocarbons (HCFCs), and flame retardants.
Some of the contaminants in e-waste pose serious health risks and can be responsible for kidney damage, and skin disorders, and affect the nervous and immune systems. (2)
Improper e-waste management contributes to global warming. Improper recycling of fridges and air-conditioners led to the release of 98 Mt of CO2 equivalents into the environment in 2019 alone.
This accounts for about 0.3% of global energy-related emissions. (2)
The percentage of e-waste that ends up in landfills varies across the different regions. In countries with developed recycling infrastructure around 8% of the e-waste is discarded in waste bins and landfilled.
In other regions, such as Central Asia, most of the e-waste ends up in landfills or illegal dumping sites. In Eastern Europe recycling industry is in development, but for now doesn’t achieve the same rates of recycling as Northern and Western Europe. (2)
Recycling e-waste is important for several reasons. One of the primary reasons is that electronic devices often contain a variety of materials, including metals, plastics, and glass, which can be recovered and used to manufacture new products. This not only reduces the need to extract and process raw materials but also reduces the amount of waste that ends up in landfills.
In addition to the environmental benefits of recycling e-waste, there is also a significant monetary value to be gained from recovering and recycling these materials. For example, the metals in electronic devices can be recovered and sold to metal recyclers, who can then use them to manufacture new products.
Similarly, the plastics and other materials in electronic devices can be recovered and used to make new products, which can generate revenue for recyclers and manufacturers.
Overall, recycling e-waste is important for both environmental and economic reasons. By recovering and recycling materials from electronic devices, we can reduce waste, conserve natural resources, and generate revenue from the sale of recovered materials.
A wide variety of base and precious metals can be recovered from e-waste including:
Ferrous metals: Iron
Base metals: Copper, Tin, Lead, Nickel, Aluminum, Zinc
Precious metals: Iridium, Rhenium, Ruthenium, Rhodium, Palladium, Osmium, Platinum, Silver, and Gold
Rare-earth metals: Neodymium, Europium, Terbium, and other rare earth metals
Many other elements and metals can be found and recycled from e-waste: Lithium, Silicon, Cadmium, Tellurium, Titanium, Molybdenum, and some others.
There are a few reasons why e-waste recycling is so difficult.
E-waste recycling is very costly. The consumer products are not designed nor assembled with recycling principles in mind which brings complexity to the recycling process.
Recycling of e-waste is a very complicated process from a technical standpoint, requiring multiple steps of shredding, separation of plastic and metals, hydro and/or pyro metallurgical steps for metal recovery, and many other technological know-how.
On the other hand, a large amount of precious and base metals makes it worthwhile to invest in the recycling process design. For example, it is estimated that there are 280 grams of Gold in one ton of mobile phone e-waste. (2)
Several technologies are commonly used for effective e-waste recycling. These include:
We prepared a detailed blog on precious metals recovery from e-waste and highly recommend you read it.
In a circular economy, e-waste is seen as a valuable resource that can be recovered and recycled. This is because many of the materials used to make electronic devices can be recovered and used again in the production of new products. By recycling e-waste in a circular economy, we can reduce the need for mining and other forms of resource extraction, which can help to conserve the environment and reduce pollution.
Gold
These days gold mostly comes from mines. About 75% of the total supply of gold is mined every year. This is not nearly enough to cover the overall demand of about 4,000 metric tons and the rest is made up from recycling. (8)
About 90% of the recycled gold comes from jewelry with the rest (about 160 metric tons) coming from electronic waste and other technological sources. (6)
Silver
In 2021 about 23,000 tonnes of silver was mined and only about 5,000 tonnes of silver came from recycling. Recycled silver comes from a variety of sources including industrial, jewelry, silverware, and photography. (9) Silver from electronic waste represents about 900 tonnes per year and this number is expected to grow over the course of the next few years.
Copper
About 23 million tonnes of copper are mined on an annual basis worldwide. Copper is one of the most recycled metals as close to 9 million tonnes every year are recovered from end-of-life scrap and scrap generated during the industrial production processes. On average 32% of all copper in use was sourced through recycling. (10,11)
Palladium
Palladium produced currently is not enough to satisfy the demand, which leads to an increased requirement for recovery from scrap. With about 80% of palladium utilized in auto exhaust systems, recycling of catalytic converters has become very trendy, and recyclers are taking advantage of the deficit. (12)
World mine production yields about 200 tonnes of palladium annually with an additional 95 tonnes coming from recycling, mostly from catalytic converters. (13)
Most of the electronic waste can and should be recycled. E-waste contains materials and metals that can be reused and given a second life.
Some of the ways to increase the recycling rates of e-waste are:
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