§ 421.93 Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best available technology economically achievable.
Current through Aug 22, 2025 · Read all of Part 421
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:
Subpart I—Metallurgical Acid Plant—BAT Effluent Limitations
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/kg (pounds per/million pounds) of 100 pct sulfuric acid capacity | ||
| Arsenic | 3.550 | 1.584 |
| Cadmium | 0.511 | 0.204 |
| Copper | 3.269 | 1.558 |
| Lead | 0.715 | 0.332 |
| Zinc | 2.605 | 1.073 |
| Fluoride 1 | 89.390 | 50.820 |
| Molybdenum 1 | [Reserved] | [Reserved]. |
1 For Molybdenum acid plants only.
[50 FR 38343, Sept. 20, 1985, as amended at 55 FR 31697, Aug. 3, 1990]