Every year, Americans send millions of tons of food to the landfill. What if you could use all of those pizza crusts and rotten vegetables to heat your home? That's already happening in one unlikely ...

EAST PROVIDENCE — As a porous conveyor belt rolls forward, the murky soup it carries drains of water and leaves behind a thick sludge the consistency of wet cement. There’s no question about it. This ...

Since anaerobic digestion was developed at the beginning of the twentieth century, many approaches have been made to come up with the appropriate shape for sludge digesters. Designs were founded in ...