Total subcategories 61
Phase I 26
Phase II 35
Subcategories studied 12 Discharges in industry
Zero discharge 215
Source: From U.S. EPA, Treatability Manual, Volume II Industrial Descriptions, report EPA-600/2-82-001b, U.S. EPA, Washington, DC, September 1981.
BPT Limitations for the Nonferrous Metals Industry3
Secondary Aluminum Smelting
Primary Aluminum Chlorine Demagging Smelting (kg/T (kg/T of Magnesium
Oil and grease Ammonia
(as nitrogen) pH, pH units Fluoride Aluminum Arsenic Cadmium Copper Lead Selenium Zinc of Product)
Wet Processing (kg/T of Product)
Primary Copper Primary Copper
Secondary Copperb c (mg/L)
Primary Leadbc (mg/L)
Primary Zinc (kg/T of Product)
Source: From 2-36, U.S. EPA, Effluent guidelines and standards for nonferrous metals, 40CFR421; 39FR12822, April 8, 1974; Amended by 40FR8514, February 27, 1975; 40FR48348,
October 15, 1975; 41FR 54850, December 15, 1976, U.S. EPA, Washington, DC, 1974-1976. Dashes indicate parameters not regulated for BPT in this subcategory.
a Average daily value over 30 consecutive days; maximum daily value permitted is twice the average amount, except for the secondary aluminum subcategory for which maximum values are not available. T = metric ton = 1000 kg = 2204.6 lb. b There shall be no discharge or process wastewater pollutants to navigable waters except for a volume equivalent to the precipitation in excess of the 10-yr 24-h rainfall event. 0 BPT limitations established for the volume of wastewater equal to the difference between the mean precipitation for that month that falls within the impoundment and the mean evaporation from the pond water surface.
are grouped as Phase I. The remaining subcategories have been identified as Phase II of the nonfer-rous metals subcategories (Table 3.2).
The information on aluminum is collected from the U.S. EPA,1,2 the Aluminum Association,10 the U.S. Trade Commission11 and the U.S. Department of Commerce.12
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