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 ------------------------------------------------------------------------
BAT effluent limitations
---------------------------
Pollutant or pollutant property Maximum for
Maximum for monthly
any 1 day average------------------------------------------------------------------------
mg/off-kg (lb/million off-
lbs) of aluminum rolled
with emulsions
---------------------------Chromium.................................... 0.057 0.024Cyanide..................................... 0.038 0.016Zinc........................................ 0.19 0.079Aluminum.................................... 0.84 0.42------------------------------------------------------------------------
Subpart B
Direct Chill Casting Contact Cooling Water ------------------------------------------------------------------------
BAT effluent limitations
---------------------------
Pollutant or pollutant property Maximum for
Maximum for monthly
any 1 day average------------------------------------------------------------------------
mg/off-kg (lb/million off-
lbs) of aluminum cast
---------------------------Chromium.................................... 0.59 0.24Cyanide..................................... 0.39 0.16Zinc........................................ 1.94 0.81Aluminum.................................... 8.55 4.26------------------------------------------------------------------------
Subpart B
Solution Heat Treatment Contact Cooling Water ------------------------------------------------------------------------
BAT Effluent Limitations
---------------------------
Pollutant or pollutant property Maximum for
Maximum for monthly
any 1 day average------------------------------------------------------------------------
mg/off-kg (lb/million off-
lbs) of aluminum quenched
---------------------------Chromium.................................... 0.90 0.37Cyanide..................................... 0.59 0.25Zinc........................................ 2.98 1.25Aluminum.................................... 13.10 6.52------------------------------------------------------------------------
Subpart B
Cleaning or Etching Bath ------------------------------------------------------------------------
BAT effluent limitations
---------------------------
Pollutant or pollutant property Maximum for
Maximum for monthly
any 1 day average------------------------------------------------------------------------
mg/off-kg (lb/million off-
lbs) of aluminum cleaned
or etched
---------------------------Chromium.................................... 0.079 0.032Cyanide..................................... 0.052 0.022Zinc........................................ 0.26 0.109Aluminum.................................... 1.15 0.573------------------------------------------------------------------------
Subpart B
Cleaning or Etching Rinse ------------------------------------------------------------------------
BAT effluent limitations
---------------------------
Pollutant or pollutant property Maximum for
Maximum for monthly
any 1 day average------------------------------------------------------------------------
mg/off-kg (lb/million off-
lbs) of aluminum cleaned
or etched
---------------------------Chromium.................................... 0.61 0.25Cyanide..................................... 0.41 0.17Zinc........................................ 2.03 0.85Aluminum.................................... 8.95 4.45------------------------------------------------------------------------
Subpart B
Cleaning or Etching Scrubber Liquor ------------------------------------------------------------------------
BAT effluent limitations
---------------------------
Pollutant or pollutant property Maximum for
Maximum for monthly
any 1 day average------------------------------------------------------------------------
mg/off-kg (lb/million off-
lbs) of aluminum cleaned
or etched
---------------------------Chromium.................................... 0.85 0.35Cyanide..................................... 0.56 0.23Zinc........................................ 2.82 1.18Aluminum.................................... 12.43 6.19------------------------------------------------------------------------ [48 FR 49149, Oct. 24, 1983; 49 FR 11631 and 11633, Mar. 27, 1984]