Wis. Admin. Code Department of Natural Resources NR 257.32
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 66
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 extruded | ||
Chromium | 0.16 | 0.066 |
Cyanide | 0.11 | 0.044 |
Zinc | 0.53 | 0.22 |
Aluminum | 2.34 | 1.16 |
Oil and grease | 7.32 | 4.39 |
Suspended solids | 15.00 | 7.13 |
pH | (1) | (1) |
1 Within the range of 7.0 to 10 at all times.
Table 67
Extrusion press leakage BPT
Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
mg/off-kg (lb/million off-lbs) of aluminum extruded | ||
Chromium | 0.65 | 0.27 |
Cyanide | 0.43 | 0.18 |
Zinc | 2.16 | 0.90 |
Aluminum | 9.51 | 4.73 |
Oil and grease | 29.56 | 17.74 |
Suspended solids | 60.60 | 28.82 |
pH | (1) | (1) |
1 Within the range of 7.0 to 10 at all times.
Table 68
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 | 54.49 | 25.92 |
pH | (1) | (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 69
Press 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 | 1.39 |
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 70
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 | 1.39 |
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 71
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 | 0.26 | 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 72
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 73
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) |
1 Within the range of 7.0 to 10 at all times.
Table 74
Degassing 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 degassed | ||
Chromium | 1.15 | 0.47 |
Cyanide | 0.76 | 0.32 |
Zinc | 3.81 | 1.59 |
Aluminum | 16.78 | 8.35 |
Oil and grease | 52.18 | 31.31 |
Suspended solids | 106.97 | 50.88 |
pH | (1) | (1) |
1 Within the range of 7.0 to 10 at all times.
Wis. Admin. Code Department of Natural Resources NR 257.32