Coals found in Iowa have sulfur contents that exceed the amount allowed by most federal, state, county and municipal sulfur dioxide emission standards. Tightening and strict enforcement of the state implementation plan regulations may increase the demand for desulfurization by cleaning of...

Sulfur dioxide emission standards for coal-fired stationary boilers generally range from 1.2 pounds per million Btu of heat input for large boilers constructed after August 17, 1971 to 5 to 6 pounds of SO2 emissions for other large boilers constructed on or before August 17, 1971 and for boilers...