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Treatments & Technologies
Air Emissions
Dust emission control technologies include cyclones, baghouses, and electrostatic precipitators (ESPs). Scrubbers are used to control acid mists. Fugitive emissions from charging and tapping of EAFs should be controlled by locating the EAF in an enclosed building or using hoods and by evacuating the dust to dust arrestment equipment to achieve an emissions level of less than 0.25 kg/t.
Wastewater Treatment
Spent pickle liquor containing hydrochloric acid is treated by spraying it into a roasting chamber and scrubbing the vapors. If hexavalent chrome is present in salt pickling or electrolytic pickling baths, it can be reduced with a sulfide reagent, iron salts, or other reducing agents. The remain- ing wastewaters are typically treated using oil- water separation flotation, precipitation, chemical flocculation, sedimentation/parallel plate separation/hydrocycloning, and filtration. Methods such as ultrafiltration may be used for oil emulsions. For continuous casting and cold rolling, oil should be less than 5 g/t and total suspended solids less than 10 g/t. For hot roll- ing, the corresponding values are 10 g/t and 50 g/t, respectively.
 
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