§ 421.276 Pretreatment standards for new sources.
Current through Aug 22, 2025 · Read all of Part 421
Except as provided in 40 CFR 403.7, any new 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 new sources. The mass of wastewater pollutants in primary rare earth metals process wastewater introduced into a POTW shall not exceed the following values:
(a) Dryer vent water quench and scrubber.
PSNS for the Primary Rare Earth Metals Subcategory
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/kg (pounds per million pounds) of mischmetal produced from wet rare earth chlorides | ||
| Hexachlorobenzene | 0.042 | 0.042 |
| Chromium (total) | 1.544 | 0.626 |
| Lead | 1.168 | 0.542 |
| Nickel | 2.295 | 1.544 |
(b) Dryer vent caustic wet air pollution control.
PSNS for the Primary Rare Earth Metals Subcategory
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/kg (pounds per million pounds) of mischmetal produced from wet rare earth chlorides | ||
| Hexachlorobenzene | 0.007 | 0.007 |
| Chromium (total) | 0.272 | 0.110 |
| Lead | 0.206 | 0.095 |
| Nickel | 0.404 | 0.272 |
(c) Electrolytic cell water quench and scrubber.
PSNS for the Primary Rare Earth Metals Subcategory
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/kg (pounds per million pounds) of total mischmetal produced | ||
| Hexachlorobenzene | 0.094 | 0.094 |
| Chromium (total) | 3.474 | 1.409 |
| Lead | 2.629 | 1.221 |
| Nickel | 5.165 | 3.474 |
(d) Electrolytic cell caustic wet air pollution control.
PSNS for the Primary Rare Earth Metals Subcategory
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/kg (pounds per million pounds) of total mischmetal produced | ||
| Hexachlorobenzene | 0.000 | 0.000 |
| Chromium (total) | 0.000 | 0.000 |
| Lead | 0.000 | 0.000 |
| Nickel | 0.000 | 0.000 |
(e) Sodium hypochlorite filter backwash.
PSNS for the Primary Rare Earth Metals Subcategory
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/kg (pounds per million pounds) of total mischmetal produced | ||
| Hexachlorobenzene | 0.004 | 0.004 |
| Chromium (total) | 0.134 | 0.054 |
| Lead | 0.101 | 0.047 |
| Nickel | 0.199 | 0.134 |