This drawing shows the innards of a modern waste-to-energy plant. Municipal solid waste is chopped up as its fed into the boiler, where the combustion takes place. To reduce air pollutants, the plant recirculates the combustion air and sprays a lime and water into the flue gas, among other things. At the end, a series of bags (at right) capture particulates. This plant is able to operate at 80 percent below EPA limits on air pollutants and reduce the volume of trash by about 80 percent. Metals are recycled, too.
October 21, 2011 9:47 AM PDT
Photo by: Martin LaMonica/CNET
| Caption by: Martin LaMonica
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