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Air
  The 1990 Amendment to the U.S. Clean Air Act named the SunCoke Energy non-recovery technology as the Maximum Achievable Control Technology (MACT) for U.S. cokemaking. All new coke plants built in the United States must comply with those MACT standards; all older positive-pressure cokemaking technology fails to comply. SunCoke Energy's coke oven emissions are extremely low since negative draft prevents leaks and long retention time at high temperatures incinerates virtually all typical coke plant emissions. Most ambient air emissions are also reduced.

Water
  There are no waste water discharges from a SunCoke Energy heat recovery plant. The plant is a net water consumer with machine cooling water reused to provide quench water.

Solid Waste
  There are no hazardous solid wastes or sludges from a SunCoke Energy heat recovery plant. The only solid wastes are non-hazardous calcium sulfate and calcium sulfite from the spray dryer flue gas desulfurization system which can be recycled to other industries, used as fertilizer for certain crops, or land filled.

This table shows that not only are the Indiana Harbor Plant stack gas concentrations of CO substantially lower than typical industrial combustion sources, but are even lower than urban and rural ambient air concentrations.

TYPICAL CARBON MONOXIDE (CO) CONCENTRATIONS
CO-PPM (dry basis)  
   
Automobile with catalytic converter 10,000
Hazardous waster incinerator (standard) 100
Coal fired spreader stoker boiler 70
Pulverized coal boiler 40
Natural gas fired boiler 20
Urban ambient air 5 - 50
Rural ambient air 1 - 3
SunCoke Energy heat recovery stack (1) 0.6
(1) Measured over 2 day period, July 1998  

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