Effluent limitations representing the degree of effluent reduction attainable by the application of the best available technology economically achievable.

Except as provided in 40 CFR 125.30 through 125.32, any existing point source subject to this subpart must achieve the following effluent limitations representing the degree of effluent reduction attainable by the application of the best available technology economically achievable. The discharge of process wastewater pollutants from the core shall not exceed the values set forth below: Subpart B Core Pollutant or pollutant property BAT effluent limitations Maximum for any 1 day Maximum for monthly average mg/off-kg (lb/million off-lbs) of aluminum rolled with emulsions Chromium 0.057 0.024 Cyanide 0.038 0.016 Zinc 0.19 0.079 Aluminum 0.84 0.42 Subpart B Direct Chill Casting Contact Cooling Water Pollutant or pollutant property BAT effluent limitations Maximum for any 1 day Maximum for monthly average mg/off-kg (lb/million off-lbs) of aluminum cast Chromium 0.59 0.24 Cyanide 0.39 0.16 Zinc 1.94 0.81 Aluminum 8.55 4.26 Subpart B Solution Heat Treatment Contact Cooling Water Pollutant or pollutant property BAT Effluent Limitations Maximum for any 1 day Maximum for monthly average mg/off-kg (lb/million off-lbs) of aluminum quenched Chromium 0.90 0.37 Cyanide 0.59 0.25 Zinc 2.98 1.25 Aluminum 13.10 6.52 Subpart B Cleaning or Etching Bath Pollutant or pollutant property BAT effluent limitations Maximum for any 1 day Maximum for monthly average mg/off-kg (lb/million off-lbs) of aluminum cleaned or etched Chromium 0.079 0.032 Cyanide 0.052 0.022 Zinc 0.26 0.109 Aluminum 1.15 0.573 Subpart B Cleaning or Etching Rinse Pollutant or pollutant property BAT effluent limitations Maximum for any 1 day Maximum for monthly average mg/off-kg (lb/million off-lbs) of aluminum cleaned or etched Chromium 0.61 0.25 Cyanide 0.41 0.17 Zinc 2.03 0.85 Aluminum 8.95 4.45 Subpart B Cleaning or Etching Scrubber Liquor Pollutant or pollutant property BAT effluent limitations Maximum for any 1 day Maximum for monthly average mg/off-kg (lb/million off-lbs) of aluminum cleaned or etched Chromium 0.85 0.35 Cyanide 0.56 0.23 Zinc 2.82 1.18 Aluminum 12.43 6.19 [48 FR 49149, Oct. 24, 1983; 49 FR 11631, 11633, Mar. 27, 1984]