Landfills around the world are filling up. In 2016, over 2 billion tonnes of waste was generated globally. In the next 30 years, that figure is expected to grow to 3.4 billion.
A recent report by UN Environment’s International Environmental Technology Centre has outlined one technology that has the potential to reduce the volume of waste entering landfills by up to 90 per cent – setting up of a waste to energy plant.
Waste-to-energy plants have been around for over 100 years, but today their use is on the rise. This is owing to the perception of the plants as a quick-fix solution to growing waste challenges. This phenomenon is especially apparent in Asia, where some 1,200 of the 1,700 plants worldwide are found.
The core concept of waste to energy plants has remained largely the same as a century ago. Burn solid waste at high temperatures so that the waste is eliminated and use the excess heat to power turbines and create electricity.
Historically, this would also produce significant amounts of ash and toxic gases. Today’s waste-to-energy plants, however, are much cleaner. Advanced technologies help to burn waste at extremely high temperatures, which ensures complete combustion. Emissions are also specially treated, which leaves minimal amounts of toxic byproducts like flue ash. Some tests have even shown that the air emitted by certain waste-to-energy chimneys can be cleaner than the air flowing in.
Waste-to-energy plants can also reduce greenhouse gas emissions compared to open burning and landfills. Open burning does not happen at a high-enough temperature for complete combustion, so emissions are dirty. And in landfills, biomaterial will decompose and emit methane, a powerful greenhouse gas.
The waste to energy plants are viewed as a clean energy source, however, a mismanaged plant will produce unsafe byproducts, even with advanced emission control technologies. In countries where there are detailed regulations governing waste-to-energy plants, it’s less of an issue. But where countries don’t have strategies for maintenance and monitoring or guidelines on health and safety, there is a much higher risk.
For example, a large-scale modern thermal waste-to-energy plant requires between 100,000–300,000 tonnes of municipal solid waste per year over, delivered daily over its lifetime. If an operator can’t procure enough waste, some plants could potentially drop below their optimal operating temperature. When that happens, efficiency drops and the risk of toxic emissions is increased.
In an extreme scenario, operating a plant may mean a government has to import waste or add coal to the waste stream, just to feed the fires.
And while a waste-to-energy plant may significantly reduce the amount of waste going to landfill, it does not eliminate the need for them entirely. The residues that such a plant does produce are hazardous and require safe disposal.
The benefits of the plants are clear, but the technology is not without its problems. For those countries eyeing the technology, getting the regulations and the legislation right will ensure the technology does more good than harm.
Thank you for reading. Please drop a line and help us do better.
The CSR Journal Team