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§ 421.112 Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available.
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 practicable technology currently available:
(a) Subpart K—Concentrate Digestion Wet Air Pollution Control.
BPT Effluent Limitations
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/kg (pounds per million pounds) of concentrate digested | ||
| Lead | 2.612 | 1.244 |
| Zinc | 9.080 | 3.794 |
| Ammonia (as N) | 829.000 | 364.500 |
| Fluoride | 217.700 | 124.400 |
| Total suspended solids | 255.000 | 121.300 |
| pH | ( 1) | ( 1) |
1 Within the range of 7.5 to 10.0 at all times.
(b) Subpart K—Solvent Extraction Raffinate.
BPT Effluent Limitations
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/kg (pounds per million pounds) of concentrate digested | ||
| Lead | 3.888 | 1.851 |
| Zinc | 13.520 | 5.647 |
| Ammonia (as N) | 1,233.000 | 542.500 |
| Fluoride | 324.000 | 185.100 |
| Total Suspended Solids | 379.500 | 189.500 |
| pH | ( 1) | ( 1) |