40 C.F.R. § 467.32
Except as provided in 40 CFR 125.30 through 125.32 , any existing point source subject to this subpart must achieve the following effluent limitations representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available:
Subpart C
Core
| Pollutant or pollutant property | BPT effluent limitations | |
| 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 | 15.0 | 7.13 |
| pH | (1) | (1) |
1 Within the range of 7.0 to 10.0 at all times.
Subpart C
Extrusion Press Leakage
| Pollutant or pollutant property | BPT effluent limitations | |
| 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 With the range of 7.0 to 10.0 at all times.
Subpart C
Direct Chill Casting Contact Cooling Water
| Pollutant or pollutant property | BPT effluent limitations | |
| 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.
Subpart C
Press Heat Treatment Contact Cooling Water
| Pollutant or pollutant property | BPT effluent limitations | |
| 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 10.0 at all times.
Subpart C
Solution Heat Treatment Contact Cooling Water
| Pollutant or pollutant property | BPT effluent limitations | |
| 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 10.0 at all times.
Subpart C
Cleaning or Etching Bath
| Pollutant or pollutant property | BPT effluent limitations | |
| 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 10.0 at all times.
Subpart C
Cleaning or Etching Rinse
| Pollutant or pollutant property | BPT effluent limitations | |
| 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 10.0 at all times.
Subpart C
Cleaning or Etching Scrubber Liquor
| Pollutant or pollutant property | BPT effluent limitations | |
| 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 10.0 at all times.
Subpart C
Degassing Scrubber Liquor
| Pollutant or pollutant property | BPT effluent limitations | |
| 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 10.0 at all times.
40 C.F.R. §467.32