Title 40
SECTION 421.122
421.122 Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available.
§ 421.122 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 L - Film Stripping.
BPT Effluent Limitations
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/troy ounce of silver from film stripping | ||
| Copper | 95.670 | 50.350 |
| Zinc | 73.510 | 30.720 |
| Ammonia (as N) | 6,712.000 | 2,951.000 |
| Total suspended solids | 2,065.000 | 981.800 |
| pH | ( 1) | ( 1) |
1 Within the range of 7.5 to 10.0 at all times.
(b) Subpart L - Film Stripping Wet Air Pollution Control and Precipitation and Filtration of Film Stripping Solutions Wet Air Pollution Control.
BPT Effluent Limitations
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/troy ounce of silver from precipitation and filtration of film stripping solutions | ||
| Copper | 1.843 | .970 |
| Zinc | 1.416 | .592 |
| Ammonia (as N) | 129.300 | 56.840 |
| Total suspended solids | 39.770 | 18.920 |
| pH | ( 1) | ( 1) |
1 Within the range of 7.5 to 10.0 at all times.
(c) Subpart L - Precipitation and Filtration of Film Stripping Solutions.
BPT Effluent Limitations
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/troy ounce of silver precipitated | ||
| Copper | 109.400 | 57.570 |
| Zinc | 84.050 | 35.120 |
| Ammonia (as N) | 7,674.000 | 3,374.000 |
| Total suspended solids | 2,361.000 | 1,123.000 |
| pH | ( 1) | ( 1) |
1 Within the range of 7.5 to 10.0 at all times.
(d) Subpart L - Precipitation and Filtration of Photographic Solutions.
BPT Effluent Limitations
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/troy ounce of silver precipitated | ||
| Copper | 50.540 | 26.600 |
| Zinc | 38.836 | 16.226 |
| Ammonia (as N) | 3,545.000 | 1,559.000 |
| Total suspended solids | 1,090.600 | 518.700 |
| pH | ( 1) | ( 1) |
1 Within the range of 7.5 to 10.0 at all times.
(e) Subpart L - Precipitation and Filtration of Photographic Solutions Wet Air Pollution Control.
BPT Effluent Limitations
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/troy ounce of silver from precipitation and filtration of photographic solutions | ||
| Copper | 23.070 | 12.140 |
| Zinc | 17.730 | 7.406 |
| Ammonia (as N) | 1,618.000 | 711.400 |
| Total suspended solids | 497.800 | 236.800 |
| pH | ( 1) | ( 1) |
1 Within the range of 7.5 to 10.0 at all times.
(f) Subpart L - Electrolytic Refining.
BPT Effluent Limitations
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/troy ounce of silver from electrolytic refining | ||
| Copper | 1.444 | .760 |
| Zinc | 1.110 | .464 |
| Ammonia (as N) | 101.300 | 44.540 |
| Total suspended solids | 31.160 | 14.820 |
| pH | ( 1) | ( 1) |
1 Within the range of 7.5 to 10.0 at all times.
(g) Subpart L - Furnace Wet Air Pollution Control.
BPT Effluent Limitations
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/troy ounce of silver roasted, smelted, or dried | ||
| Copper | 1.273 | .670 |
| Zinc | .978 | .409 |
| Ammonia (as N) | 89.310 | 39.260 |
| Total suspended solids | 27.470 | 13.070 |
| pH | ( 1) | ( 1) |
1 Within the range of 7.5 to 10.0 at all times.
(h) Subpart L - Leaching.
BPT Effluent Limitations
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/troy ounce of silver produced from leaching | ||
| Copper | .164 | .086 |
| Zinc | .126 | .053 |
| Ammonia (as N) | 11.470 | 5.040 |
| Total suspended solids | 3.526 | 1.677 |
| pH | ( 1) | ( 1) |
1 Within the range of 7.5 to 10.0 at all times.
(i) Subpart L - Leaching Wet Air Pollution Control and Precipitation of Nonphotographic Solutions Wet Air Pollution Control.
BPT Effluent Limitations
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/troy ounce of silver produced from leaching or silver precipitated | ||
| Copper | 8.417 | 4.430 |
| Zinc | 6.468 | 2.703 |
| Ammonia (as N) | 590.500 | 259.600 |
| Total suspended solids | 181.700 | 86.390 |
| pH | ( 1) | ( 1) |
1 Within the range of 7.5 to 10.0 at all times.
(j) Subpart L - Precipitation and Filtration of Nonphotographic Solutions.
BPT Effluent Limitations
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/troy ounce of silver precipitated | ||
| Copper | 5.833 | 3.070 |
| Zinc | 4.482 | 1.873 |
| Ammonia (as N) | 409.300 | 179.900 |
| Total suspended solids | 125.900 | 59.870 |
| pH | ( 1) | ( 1) |
1 Within the range of 7.5 to 10.0 at all times.
(k) Subpart L - Floor and Equipment Washdown.
BPT Effluent Limitations
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/troy ounce of silver production | ||
| Copper | .000 | .000 |
| Zinc | .000 | .000 |
| Ammonia (as N) | .000 | .000 |
| Total suspended solids | .000 | .000 |
| pH | ( 1) | ( 1) |
1 Within the range of 7.5 to 10.0 at all times.