Heat Pump Used to Drain Contaminated Sludge in a Steel Factory

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Courtesy of Natural Resources Canada (NRCan)

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In 1987, new regulations required that factories dispose of their contaminated water and waste themselves. Making galvanised steel wire, the Stelfil factory produces sludge contaminated with lead and zinc. Stelfil spent thousands of dollars to bury this waste and evaluated three systems to remove most of the water: a gas dryer, an induction heated screw conveyor and a heat pump system. Even though it had never been used in those particular conditions, the heat pump (HP) system was chosen and demonstrated good results. Energy savings of 300 MWh were achieved as well as economical savings of CAD 50,000 per year.

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