§ 421.245 Pretreatment standards for existing sources.
Except as provided in 40 CFR 403.7 and 403.13, any existing source subject to this subpart which introduces pollutants into a publicly owned treatment works must comply with 40 CFR part 403 and achieve the following pretreatment standards for existing sources. The mass of wastewater pollutants in secondary nickel process wastewater introduced into a POTW must not exceed the following values:
(a) Slag reclaim tailings.
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/kg (pounds per million pounds) of slag input to reclaim process | ||
| Chromium (total) | 5.653 | 2.313 |
| Copper | 24.410 | 12.850 |
| Nickel | 24.670 | 16.320 |
(b) Acid reclaim leaching filtrate.
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/kg (pounds per million pounds) of acid reclaim nickel produced | ||
| Chromium (total) | 2.198 | 0.899 |
| Copper | 9.491 | 4.995 |
| Nickel | 9.590 | 6.344 |
(c) Acid reclaim leaching belt filter backwash
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/kg (pounds per million pounds) of acid reclaim nickel produced | ||
| Chromium (total) | 0.528 | 0.216 |
| Copper | 2.278 | 1.199 |
| Nickel | 2.302 | 1.523 |