Every downstream waste process generates some amount of waste—meaning there is a residue of material that cannot be processed. For example, many recycling processes generate waste streams that cannot be turned into new commodities. EfW facilities generate a non hazardous ash residue composed of the noncombustible material in wastes and, to a lesser extent, materials added for air pollution control, such as activated carbon and lime.  Over one-third of our ash is used beneficially at landfills as daily cover or for roadway materials. This practice reduces the amount of virgin soils that need to be used at the landfill.

We are now advancing new ways to reuse and recover more materials from our ash. Learn more about our new Total Ash Processing System (TAPS).

Where Does the Ash go?

In the U.S., roughly half of the total ash is managed in traditional landfills, with the rest placed in ash monofills (or landfills only containing ash). Finding additional uses for ash is a key objective for Covanta and the industry.

For more information, please see Covanta’s white paper, Ash from Energy‐from‐Waste.