40 CFR § 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
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) |
Within the range of 7.5 to 10.0 at all times.
(c) Subpart K—Solvent Extraction Wet Air Pollution Control.
BPT Effluent Limitations
1 Within the range of 7.5 to 10.0 at all times.
(d) Subpart K—Precipitation and Filtration.
BPT Effluent Limitations
1 Within the range of 7.5 to 10.0 at all times.
(e) Subpart K—Precipitation and Filtration Wet Air Pollution Control.
BPT Effluent Limitations
1 Within the range of 7.5 to 10.0 at all times.
(f) Subpart K—Tantalum Salt Drying.
BPT Effluent Limitations
1 Within the range of 7.5 to 10.0 at all times.
(g) Subpart K—Oxides Calcining 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 columbium-tantalum oxide dried | ||
| Lead | 16.140 | 7.685 |
| Zinc | 56.100 | 23.440 |
| Ammonia (as N) | 5,122.000 | 2,252.000 |
| Fluoride | 1,345.000 | 768.500 |
| Total suspended solids | 1,576.000 | 749.200 |
| pH | ( 1) | ( 1) |
1 Within the range of 7.5 to 10.0 at all times.
(h) Subpart K—Reduction of Tantalum Salt to Metal.
BPT Effluent Limitations
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/kg (pounds per million pounds) of tantalum salt reduced | ||
| Lead | 69.750 | 33.220 |
| Zinc | 242.500 | 101.300 |
| Ammonia (as N) | 22,140.000 | 9,732.000 |
| Fluoride | 5,813.000 | 3,322.000 |
| Total suspended solids | 6,809.000 | 3,239.000 |
| pH | ( 1) | ( 1) |
1 Within the range of 7.5 to 10.0 at all times.
(i) Subpart K—Reduction of Tantalum Salt to Metal Wet Air Pollution Control.
BPT Effluent Limitations
1 Within the range of 7.5 to 10.0 at all times.
(j) Subpart K—Tantalum Powder Wash.
BPT Effluent Limitations
1 Within the range of 7.5 to 10.0 at all times.
(k) Subpart K—Consolidation and Casting Contact Cooling.
BPT Effluent Limitations
1 Within the range of 7.5 to 10.0 at all times.