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§ 461.71 Effluent limitations representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available (BPT).
(a) Except as provided in 40 CFR 125.30 through 125.32, any existing point source subject to this subpart must achieve the following effluent limitations representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available:
(1) Subpart G—Wet Amalgamated Powder Anodes.
BPT Effluent Limitations
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| Metric units—mg/kg of Zinc | ||
| English units—pounds per 1,000,000 pounds of Zinc | ||
| Chromium | 1.67 | 0.68 |
| Mercury | 0.95 | 0.38 |
| Silver | 1.56 | 0.65 |
| Zinc | 5.55 | 2.32 |
| Manganese | 2.58 | 1.10 |
| Oil and grease | 76.0 | 45.6 |
| TSS | 155.8 | 74.1 |
| pH | ( 1) | ( 1) |
1 Within the range of 7.5–10.0 at all times.
(2) Subpart G—Gelled Amalgam Anodes.
BPT Effluent Limitations
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| Metric units—mg/kg of Zinc | ||
| English units—pounds per 1,000,000 pounds of Zinc | ||
| Chromium | 0.30 | 0.12 |
| Mercury | 0.17 | 0.07 |
| Silver | 0.28 | 0.12 |
| Zinc | 0.99 | 0.42 |
| Manganese | 0.46 | 0.20 |
| Oil and grease | 13.6 | 8.16 |
| TSS | 27.9 | 13.26 |
| pH | ( 1) | ( 1) |
1 Within the range of 7.5–10.0 at all times.
(3) Subpart G—Zinc Oxide, Formed Anodes.
BPT Effluent Limitations
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| Metric units—mg/kg of Zinc | ||
| English units—pounds per 1,000,000 pounds of Zinc | ||
| Chromium | 62.9 | 25.7 |
| Mercury | 35.8 | 14.3 |
| Silver | 58.7 | 24.3 |
| Zinc | 208.8 | 87.2 |
| Manganese | 97.2 | 41.5 |
| Oil and grease | 2,860.0 | 1,716.0 |
| TSS | 5,863.0 | 2,789.0 |
| pH | ( 1) | ( 1) |