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Title 40: Protection of Environment
PART 421—NONFERROUS METALS MANUFACTURING POINT SOURCE CATEGORY

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Subpart B—Primary Aluminum Smelting Subcategory

§ 421.20   Applicability: description of the primary aluminum smelting subcategory.

The provisions of this subpart are applicable to discharges resulting from the production of aluminum from alumina in the Hall-Heroult process.

§ 421.21   Specialized definitions.

For the purpose of this subpart:

(a) Except as provided below, the general definitions, abbreviations and methods of analysis set forth in part 401 of this chapter, shall apply to this subpart.

(b) The term product shall mean hot aluminum metal.

(c) If a permittee chooses to analyze for benzo(a)pyrene using any EPA-approved method, any “non-detected” measurements shall be considered zeroes for the purpose of determining compliance with this regulation.

[49 FR 8792, Mar. 8, 1984, as amended at 52 FR 25556, July 7, 1987]

§ 421.22   Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available.

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 practicable technology currently available (BPT):

[49 FR 8792, Mar. 8, 1984; 49 FR 29794, July 24, 1984]

§ 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

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

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

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

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

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

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

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

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

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

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

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

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

(n) Subpart B—Potline SO₂Emissions Wet Air Pollution Control.

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

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

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

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

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

[49 FR 8792, Mar. 8, 1984, as amended at 52 FR 25556, July 7, 1987]

§ 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.

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

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

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

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

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

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

(h) Subpart B—Potline SO₂Emissions Wet Air Pollution Control.

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

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

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

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

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

[49 FR 8792, Mar. 8, 1984; 49 FR 26739, June 29, 1984, as amended at 52 FR 25558, July 7, 1987]

§ 421.25   [Reserved]

§ 421.26   Pretreatment standards for new sources.

Except as provided in 40 CFR 403.7, any new source subject to this subpart which introduces pollutants into a publicly owned treatment works must comply with 40 CFR part 403 and achieve the following pretreatment standards for new sources. The mass of wastewater pollutants in primary aluminum process wastewater introduced into a POTW shall not exceed the following values:

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

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

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

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

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

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

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

(h) Subpart B—Potline SO₂Emissions Wet Air Pollution Control.

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

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

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

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

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

[49 FR 8792, Mar. 8, 1984; 49 FR 26739, June 29, 1984, as amended at 52 FR 25559, July 7, 1987]

§ 421.27   [Reserved]

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