Removal of Pollutants by Lime Precipitation at Metal Processing Plant Aa

Pollutant (mg/L) Raw Wastewater Treated Effluent Percent Removal pH (pH units) 2.8 7.1 —

TSS 24 11 54

Copper 180,000 2000 99

Zinc 110,000 8700 92

Source: U.S. EPA, Development Document for Effluent Limitations Guidelines and Standards for the Aluminum Forming Point Source Category, Vols. 1 & 2, U.S. EPA, Washington, DC, 1984; U.S. EPA, Aluminum Forming Point Source Category, 2008. a Data are based on the average of three influent/effluent samples.

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