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

View all text of Subpart B [§ 421.20 - § 421.27]

§ 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

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

[49 FR 8792, Mar. 8, 1984, as amended at 52 FR 25556, 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 (b), (c), (e), and (g), 1316 (b) and (c), 1317 (b) and (c), 1318 and 1361; 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 421.23