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§ 421.262 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) Furnace wet air pollution control.
BPT Limitations for the Secondary Precious Metals Subcategory
Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
---|---|---|
mg/troy ounce of precious metals, including silver, incinerated or smelted | ||
Copper | 136.400 | 71.800 |
Cyanide (total) | 20.820 | 8.616 |
Zinc | 104.800 | 43.800 |
Ammonia (as N) | 9,571.000 | 4,207.000 |
Combined metals | 21.54 | |
Total suspended solids | 2,944.000 | 1,400.000 |
pH | ( 1) | ( 1) |
1 Within the range of 7.5 to 10.0 at all times.
(b) Raw material granulation.
BPT Limitations for the Secondary Precious Metals Subcategory
Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
---|---|---|
mg/troy ounce of precious metal in the granulated raw material | ||
Copper | 12.050 | 6.340 |
Cyanide (total) | 1.839 | 0.761 |
Zinc | 9.256 | 3.867 |
Ammonia (as N) | 845.100 | 371.500 |
Combined metals | 1.902 | |
Total suspended solids | 259.900 | 123.600 |
pH | ( 1) | ( 1) |
1 Within the range of 7.5 to 10.0 at all times.
(c) Spent plating solutions.
BPT Limitations for the Secondary Precious Metals Subcategory
Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
---|---|---|
mg/liter of spent plating solution used as a raw material | ||
Copper | 1.900 | 1.000 |
Cyanide (total) | 0.290 | 0.120 |
Zinc | 1.460 | 0.610 |
Ammonia (as N) | 133.300 | 58.600 |
Combined metals | 0.300 | |
Total suspended solids | 41.000 | 19.500 |
pH | ( 1) | ( 1) |