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421.85—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 primary zinc process wastewater introduced into a POTW shall not exceed the following values:
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/kg (pounds per million pounds) of zinc reduced | ||
| Cadmium | .334 | .134 |
| Zinc | 1.702 | .701 |
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/kg (pounds per million pounds) of concentrate leached | ||
| Cadmium | .180 | .072 |
| Zinc | .919 | .378 |
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/kg (pounds per million pounds) of zinc processed through leaching | ||
| Cadmium | .000 | .000 |
| Zinc | .000 | .000 |
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/kg (pounds per million pounds) of cathode zinc produced | ||
| Cadmium | .086 | .035 |
| Zinc | .441 | .182 |
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/kg (pounds per million pounds) of cathode zinc produced | ||
| Cadmium | .150 | .060 |
| Zinc | .766 | .315 |
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/kg (pounds per million pounds) of zinc cast | ||
| Cadmium | .051 | .021 |
| Zinc | .262 | .108 |
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/kg (pounds per million pounds) of zinc cast | ||
| Cadmium | .036 | .014 |
| Zinc | .185 | .076 |
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/kg (pounds per million pounds) of cadmium produced | ||
| Cadmium | 1.234 | .494 |
| Zinc | 6.295 | 2.592 |
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