Belts move quickly at the Charlestown single stream recycling center with each belt holding less and less of the original mixed recycling refuse. Cardboard and much of the paper is automatically separated by rolling it over disks and letting heavier material fall to a belt below. Here mostly plastic and aluminum travels--at high speeds--to the next phase, where optical readers identify different types of plastic.
January 24, 2011 4:00 AM PST
Photo by: Martin LaMonica/CNET
| Caption by: Martin LaMonica
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