British thermal unit (Btu): The amount of heat required to raise the temperature of one pound of water one degree Fahrenheit; equal to 252 calories. Btu is a unit of measurement that allows multiple energy sources, such as kilowatt-hours of electricity and therms of natural gas, to be converted to a common unit.Water resource recovery facility: A new term for wastewater treatment plants that reflects their broader role in recovering nutrients, materials, and energy, beyond producing clean water.
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