When was the last time you bought a new phone, laptop, television, or fridge? What did you do with the old device? If you did not intend to re-use it, your old device became electronic waste, also known as e-waste. E-waste may represent only 2% of solid waste streams, but it is the fastest growing waste stream and can represent 70% of the hazardous waste that ends up in landfills. In 2018, 50 million tonnes of e-waste were generated, which had an equivalent weight of approximately 5,000 Eiffel Towers. The generation of e-waste is expected to be 240% higher in 2050, with 120 million tonnes.
The biggest challenge of e-waste is its diverse composition, which differs in products across different categories. It contains more than 1,000 different substances, and this makes e-waste recycling a complex and expensive process. Iron and steel constitute about 50% of the e-waste followed by plastics (21%), non-ferrous metals (13%) and other constituents. Non-ferrous metals include precious metals such as gold, silver, copper, nickel, platinum, and palladium. However, e-waste also contains hazardous substances, such as heavy metals like lead, chromium, mercury, and cadmium, and persistent organic pollutants like flame retardants. In total, only 20% of e-waste is recycled through appropriate channels. The vast majority is illegally traded to low- and middle-income countries, where there is a demand for raw materials, and disposal costs for toxic waste are cheaper due to poorer environmental protection measures. This activity is a clear example of environmental injustice, as introduced in a previous post.
To stop this illegal trade, the international treaty of the Basel Convention on the Control of Transboundary Movements of Hazardous Wastes and Their Disposal was adopted in 1989 and is now being ratified by 187 countries. This treaty requires all countries to obtain prior informed consent from a receiving country before exporting hazardous waste. Yet large amounts of e-waste continue to be shipped illegally through a complex web of transshipment ports to avoid detection by authorities. Loopholes in current e-waste regulations also allow for the export of e-waste to developing countries under the guise of “donation” and “recycling” purposes. China was the largest importer of e-waste in the world until it decided to ban waste imports in 2018. Now, the pressure is increasing in Southeast Asian countries, especially Thailand, which is also preparing to ban e-waste imports.
In the receiver countries, e-waste is usually disposed of inappropriately in open dumpsites. There, many adults and children live off the informal waste sector, which means that they extract and sell recyclable and reusable materials from mixed waste, without being registered as official workers. Most of the informal recyclers do not have protective equipment and get exposed to pollutants when breaking the e-waste components apart with their bare hands and burning insulated cables as a fast and cheap method to recover copper. This last activity causes huge air pollution and health problems due to emissions of black carbon, heavy metals and toxic chemicals. Soil and water bodies in dumpsites are also terribly polluted due to the leaching of pollutants from waste, especially when it rains. Lead is the pollutant that poses the greatest threat at the dumpsite. It is detected at high levels in soil, food and worker’s blood. Lead exposure is cumulative and can affect the nervous system, the blood system, the kidneys and reproduction. Even low exposures can damage brain development in fetuses and children, who may develop intellectual impairment.