Regulations last checked for updates: May 19, 2024

Title 40 - Protection of Environment last revised: May 16, 2024
All TitlesTitle 40Chapter IPart 421Subpart B - Subpart B—Primary Aluminum Smelting Subcategory
View all text of Subpart B [§ 421.20 - § 421.27]
§ 421.24 - Standards of performance for new sources.

Any new source subject to this subpart shall achieve the following new source performance standards:

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

Pollution Control—NSPS

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/kg (pound per million pounds) of paste produced
Benzo(a)pyrene.000
Antimony.000.000
Nickel.000.000
Aluminum.000.000
Fluoride.000.000
Oil and grease.000.000
Total suspended solids.000.000
pH( 1)( 1)

1 Within the range of 7.0 to 10.0 at all times.

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

NSPS

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/kg (pound per million pounds) of anodes cast
Benzo(a)pyrene0.0070.003
Antimony.403.180
Nickel.115.077
Aluminum1.277.566
Fluoride12.4405.518
Oil and grease2.0902.090
Total suspended solids3.1352.508
pH( 1)( 1)

1 Within the range of 7.0 to 10.0 at all times.

(c) Subpart B—Anode Bake Plant Wet Air Pollution Control.

NSPS

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/kg (pound per million pounds) of anodes baked
Benzo(a)pyrene.000
Antimony.000.000
Nickel.000.000
Aluminum.000.000
Fluoride.000.000
Oil and grease.000.000
Total suspended solids.000.000
pH( 1)( 1)

1 Within the range of 7.0 to 10.0 at all times.

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

NSPS

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/kg (pound per million pounds) of cryolite recovered
Benzo(a)pyrene1.1810.547
Antimony420.400189.200
Cyanide157.60070.060
Nickel80.57035.030
Aluminum273.200122.600
Fluoride29,430.00013,310.000
Oil and grease350.300350.300
Total suspended solids2,172.000945.800
pH( 1)( 1)

1 Within the range of 7.0 to 10.0 at all times.

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

NSPS

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/kg (pound per million pounds) of cryolite recovered
Benzo(a)pyrene1.1810.547
Antimony67.61030.120
Cyanide157.60070.060
Nickel19.27012.960
Aluminum214.00094.930
Fluoride2,084.000924.800
Oil and grease350.300350.300
Total suspended solids2,172.000945.800
pH( 1)( 1)

1 Within the range of 7.0 to 10.0 at all times.

(f) Subpart B—Potline Wet Air Pollution Control.

NSPS

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
Oil and grease.000.000
Total suspended solids.000.000
pH( 1)( 1)

1 Within the range of 7.0 to 10.0 at all times.

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

NSPS

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
Oil and grease.000.000
Total suspended solids.000.000
pH( 1)( 1)

1 Within the range of 7.0 to 10.0 at all times.

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

NSPS

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/kg (pound per million pounds) aluminum produced from electrolytic reduction
Benzo(a)pyrene0.0450.021
Antimony2.5881.153
Nickel.738.496
Aluminum8.1943.634
Fluoride79.79035.400
Oil and grease13.41013.410
Total suspended solids20.12016.090
pH( 1)( 1)

1 Within the range of 7.0 to 10.0 at all times.

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

NSPS

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
Oil and grease.000.000
Total suspended solids.000.000
pH( 1)( 1)

1 Within the range of 7.0 to 10.0 at all times.

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

NSPS

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
Oil and grease.000.000
Total suspended solids.000.000
pH( 1)( 1)

1 Within the range of 7.0 to 10.0 at all times.

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

NSPS

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)
Antimony2.5651.143
Nickel.731.492
Aluminum8.1203.602
Fluoride79.08035.090
Oil and grease13.29013.290
Total suspended solids19.94015.950
pH( 2)( 2)

1 There shall be no discharge allowance for this pollutant.

2 The pH shall be maintained within the range of 7.0 to 10.0 at all times except for those situations when this waste is discharged separately and without commingling with any other waste-water in which case the pH shall be within the range of 6.0 to 10.0 at all times.

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

NSPS

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
Fluoride6.1882.746
Oil and grease1.0401.040
Total suspended solids1.5601.248
pH( 2)( 2)

1 There shall be no discharge allowance for this pollutant.

2 Within the range of 7.0 to 10.0 at all times.

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

NSPS

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/kg (pounds 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
Oil and grease.000.000
Total suspended solids.000.000
pH( 1)( 1)

1 Within the range of 7.0 to 10.0 at all times.

[49 FR 8792, Mar. 8, 1984; 49 FR 26739, June 29, 1984, as amended at 52 FR 25558, July 7, 1987]
authority: Secs. 301, 304 (b), (c), (e), and (g), 306 (b) and (c), 307 (b) and (c), 308 and 501 of the Clean Water Act (the Federal Water Pollution Control Act Amendments of 1972, as amended by the Clean Water Act of 1977) and the Water Quality Act of 1987 (the “Act”); 33 U.S.C. 1311,1314,c,e,and, 1316 (b) andc, 1317 (b) andc,1318; 86 Stat. 816, Pub. L. 92-500; 91 Stat. 1567, Pub. L. 95-217; 101 Stat. 7, Pub. L. 100-4
source: 49 FR 8790, Mar. 8, 1984, unless otherwise noted.
cite as: 40 CFR 421.24
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