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
|
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
|
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
|
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
|
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
|
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
|
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
|
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
|
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
|
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
|
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
|
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
|
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
|
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
|
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
|
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
|
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
|
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 |
Code of Federal Regulations
465
|
| 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
|
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
|
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]