Wis. Admin. Code Department of Natural Resources NR 257.22
Except as provided in 40 CFR 125.30 to 125.32, any existing point source subject to this subchapter shall achieve the following effluent limitations representing the degree of effluent reduction attainable by the application of BPT:
Table 36
Core operation BPT
Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
mg/off-kg (lb/million off-lbs) of aluminum rolled with emulsions | ||
Chromium | 0.057 | 0.024 |
Cyanide | 0.038 | 0.016 |
Zinc | 0.19 | 0.079 |
Aluminum | 0.84 | 0.416 |
Oil and grease | 2.60 | 1.56 |
Suspended solids | 5.33 | 2.53 |
pH | (1) | (1) |
1 Within the range of 7.0 to 10 at all times.
Table 37
Direct chill casting contact cooling water BPT
Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
mg/off-kg (lb/million off-lbs) of aluminum cast | ||
Chromium | 0.59 | 0.24 |
Cyanide | 0.39 | 0.16 |
Zinc | 1.94 | 0.81 |
Aluminum | 8.55 | 4.26 |
Oil and grease | 26.58 | 15.95 |
Suspended solids pH | 54.49 (1) | 25.92 (1) |
1 The pH shall be maintained within the range of 7.0 to 10.0 at all times, except for those situations when this waste stream is discharged separately and without commingling with any other wastewater, in which case the pH shall be within the range of 6.0 to 10.0 at all times.
Table 38
Solution heat treatment contact cooling water BPT
Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
mg/off-kg (lb/million off-lbs) of aluminum quenched | ||
Chromium | 3.39 | 0.39 |
Cyanide | 2.24 | 0.93 |
Zinc | 11.25 | 4.70 |
Aluminum | 49.55 | 24.66 |
Oil and grease | 154.10 | 92.46 |
Suspended solids | 315.91 | 150.25 |
pH | (1) | (1) |
1 Within the range of 7.0 to 10 at all times.
Table 39
Cleaning or etching bath BPT
Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
mg/off-kg (lb/million off-lbs) of aluminum cleaned or etched | ||
Chromium | 0.079 | 0.032 |
Cyanide | 0.052 | 0.022 |
Zinc | 0.262 | 0.109 |
Aluminum | 1.15 | 0.573 |
Oil and grease | 3.58 | 2.15 |
Suspended solids | 7.34 | 3.49 |
pH | (1) | (1) |
1 Within the range of 7.0 to 10 at all times.
Table 40
Cleaning or etching rinse and hot water seal BPT
Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
mg/off-kg (lb/million off-lbs) of aluminum cleaned or etched | ||
Chromium | 6.12 | 2.51 |
Cyanide | 4.04 | 1.67 |
Zinc | 20.31 | 8.49 |
Aluminum | 89.46 | 44.52 |
Oil and grease | 278.24 | 166.95 |
Suspended solids | 570.39 | 271.29 |
pH | (1) | (1) |
1 Within the range of 7.0 to 10 at all times.
Table 41
Cleaning or etching scrubber liquor BPT
Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
mg/off-kg (lb/million off-lbs) of aluminum cleaned or etched | ||
Chromium | 7.00 | 2.86 |
Cyanide | 4.61 | 1.91 |
Zinc | 23.22 | 9.70 |
Aluminum | 102.24 | 50.88 |
Oil and grease | 318.00 | 190.80 |
Suspended solids | 651.90 | 310.05 |
pH | (1) | (1) |
1Within the range of 7.0 to 10 at all times.
Wis. Admin. Code Department of Natural Resources NR 257.22