40 CFR 421.23 - Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best available technology economically achievable.

§ 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
1 There shall be no discharge allowance for this pollutant.
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
(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
1 There shall be no discharge allowance for this pollutant.
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
(r) Subpart B—Continuous Rod Casting Contact Cooling.
BAT Effluent Limitations
Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
1 There shall be no discharge allowance for this pollutant.
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
(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
[49 FR 8792, Mar. 8, 1984, as amended at 52 FR 25556, July 7, 1987]

Title 40 published on 2014-07-01

no entries appear in the Federal Register after this date.

This is a list of United States Code sections, Statutes at Large, Public Laws, and Presidential Documents, which provide rulemaking authority for this CFR Part.

This list is taken from the Parallel Table of Authorities and Rules provided by GPO [Government Printing Office].

It is not guaranteed to be accurate or up-to-date, though we do refresh the database weekly. More limitations on accuracy are described at the GPO site.


United States Code
Statutes at Large
Public Laws