40 CFR 421.23: Effluent limitations guidelines 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 shall achieve the following effluent limitations representing the degree of effluent reduction attainable by the application of the best available technology economically achievable:

(a) Subpart B—Anode and Cathode Paste Plant Wet Air Pollution Control

BAT Effluent Limitations

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average

mg/kg (pounds per million pounds) of paste produced

Benzo(a)pyrene 0.005 0.002

Antimony .263 .117

Nickel .075 .050

Aluminum .831 .369

Fluoride 8.092 3.591

(b) Subpart (B)—Anode Contact Cooling and Briquette Quenching.

BAT Effluent Limitations

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average

mg/kg (pounds per million pounds) of anodes cast

Benzo(a)pyrene 0.007 0.003

Antimony .403 .180

Nickel .115 .077

Aluminum 1.277 .566

Fluoride 12.440 5.518

(c) Subpart (B)—Anode Bake Plant Wet Air Pollution Control (Closed Top Ring Furnace).

BAT Effluent Limitations

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average

mg/kg (pounds per million pounds) of anodes baked

Benzo(a)pyrene 0.146 0.067

Antimony 8.346 3.719

Nickel 2.378 1.600

Aluminum 26.420 11.720

Fluoride 257.300 114.200

(d) Subpart B—Anode Bake Plant Wet Air Pollution Control (Open Top Ring Furnace With Spray Tower Only).

BAT Effluent Limitations

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average

mg/kg (pounds per million pounds) of anodes baked

Benzo(a)pyrene 0.002 0.001

Antimony .097 .043

Nickel .028 .019

Aluminum .306 .136

Fluoride 2.975 1.320

(e) Subpart B—Anode Bake Plant Wet Air Pollution Control (Open Top Ring Furnace With Wet Electrostatic Precipitator and Spray Tower).

BAT Effluent Limitations

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average

mg/kg (pounds per million pounds) of anodes baked

Benzo(a)pyrene 0.025 0.011

Antimony 1.409 .628

Nickel .402 .270

Aluminum 4.461 1.979

Fluoride 43.440 19.270

(f) Subpart B—Anode Bake Plant Wet Air Pollution Control (Tunnel Kiln).

BAT Effluent Limitations

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average

mg/kg (pounds per million pounds) of anodes baked

Benzo(a)pyrene 0.038 0.018

Antimony 2.197 .979

Nickel .626 .421

Aluminum 6.953 3.084

Fluoride 67.710 30.050

(g) Subpart B—Cathode Reprocessing (Operated With Dry Potline Scrubbing and Not Commingled With Other Process or Nonprocess Waters).

BAT Effluent Limitations

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average

mg/kg (pounds per million pounds) of cryolite recovered

Benzo(a)pyrene 1.181 0.547

Antimony 420.400 189.200

Cyanide 157.600 70.060

Nickel 80.570 35.030

Aluminum 273.200 122.600

Fluoride 29,430.000 13,310.000

(h) Subpart B—Cathode Reprocessing (Operated With Dry Potline Scrubbing and Commingled With Other Process or Nonprocess Waters).

BAT Effluent Limitations

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average

mg/kg (pounds per million pounds) of cryolite recovered

Benzo(a)pyrene 1.181 0.547

Antimony 67.610 30.120

Cyanide 157.600 70.060

Nickel 19.270 12.960

Aluminum 214.000 94.930

Fluoride 2,084.000 924.800

(i) Subpart B—Cathode Reprocessing (Operated With Wet Potline Scrubbing).

BAT Effluent Limitations

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average

mg/kg (pound per million pounds) of cryolite recovered

Benzo(a)pyrene .000

Antimony .000 .000

Cyanide .000 .000

Nickel .000 .000

Aluminum .000 .000

Fluoride .000 .000

(j) Subpart B—Potline Wet Air Pollution Control (Operated Without Cathode Reprocessing).

BAT Effluent Limitations

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average

mg/kg (pound per million pounds) of aluminum produced from electrolytic reduction

Benzo(a)pyrene 0.028 0.013

Antimony 1.618 .721

Nickel .461 .310

Aluminum 5.120 2.271

Fluoride 49.860 22.130

(k) Subpart B—Potline Wet Air Pollution Control (Operated With Cathode Reprocessing and Not Commingled With Other Process or Nonprocess Waters).

BAT Effluent Limitations

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average

mg/kg (pound per million pounds) of aluminum produced from electrolytic reduction

Benzo(a)pyrene 0.028 0.013

Antimony 10.060 4.525

Cyanide 3.771 1.676

Nickel 1.928 .838

Aluminum 6.537 2.933

Fluoride 703.900 318.500

(l) Potline Wet Air Pollution Control Cooperated With Cathode Reprocessing and Commingled With Other Process or Nonprocess Wastewaters).

BAT Effluent Limitations

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average

mg/kg (pound per million pounds) of aluminum produced from electrolytic reduction

Benzo(a)pyrene 0.028 0.013

Antimony 1.618 .721

Cyanide 3.771 1.676

Nickel 0.461 .310

Aluminum 5.120 2.271

Fluoride 49.860 22.130

(m) Subpart B—Potroom Wet Air Pollution Control.

BAT Effluent Limitations

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average

mg/kg (pound per million pounds) of aluminum produced from electrolytic reduction

Benzo(a)pyrene 0.056 0.026

Antimony 3.204 1.428

Nickel .913 .614

Aluminum 10.140 4.499

Fluoride 98.770 43.830

(n) Subpart B—Potline SO2 Emissions Wet Air Pollution Control.

BAT Effluent Limitations

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average

mg/kg (pound per million pounds) of aluminum produced from electrolytic reduction

Benzo(a)pyrene 0.045 0.021

Antimony 2.588 1.153

Nickel .738 .496

Aluminum 8.194 3.634

Fluoride 79.790 35.400

(o) Subpart B—Degassing Wet Air Pollution Control.

BAT Effluent Limitations

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average

mg/kg (pound per million pounds) of aluminum produced from electrolytic reduction

Benzo(a)pyrene (1) (1)

Antimony 5.036 2.244

Nickel 1.435 .965

Aluminum 15.940 7.071

Fluoride 155.300 68.880

1 There shall be no discharge allowance for this pollutant.

(p) Subpart B—Pot Repair and Pot Soaking.

BAT Effluent Limitations

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average

mg/kg (pound per million pounds) of aluminum produced from electrolytic reduction

Benzo(a)pyrene .000

Antimony .000 .000

Nickel .000 .000

Aluminum .000 .000

Fluoride .000 .000

(q) Subpart B—Direct Chill Casting Contact Cooling.

BAT Effluent Limitations

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average

mg/kg (pound per million pounds) of aluminum product from direct chill casting

Benzo(a)pyrene (1) (1)

Antimony 2.565 1.143

Nickel .731 .492

Aluminum 8.120 3.602

Fluoride 79.080 35.090

1 There shall be no discharge allowance for this pollutant.

(r) Subpart B—Continuous Rod Casting Contact Cooling.

BAT Effluent Limitations

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average

mg/kg (pound per million pounds) of aluminum product from rod casting

Benzo(a)pyrene (1) (1)

Antimony .201 .089

Nickel .057 .038

Aluminum .636 .282

Fluoride 6.188 2.746

1 There shall be no discharge allowance for this pollutant.

(s) Subpart B—Stationary Casting or Shot Casting Contact Cooling.

BAT Effluent Limitations

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average

mg/kg (pound per million pounds) of aluminum product from stationary casting or shot casting

Benzo(a)pyrene .000

Antimony .000 .000

Nickel .000 .000

Aluminum .000 .000

Fluoride .000 .000