GroundRules
40 CFR 421.276: Pretreatment standards for new sources.
Where this section sits in the code
- Title 40—Protection of Environment
- CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY
- SUBCHAPTER N—EFFLUENT GUIDELINES AND STANDARDS
- PART 421—NONFERROUS METALS MANUFACTURING POINT SOURCE CATEGORY
- Subpart Y—Primary Rare Earth Metals Subcategory
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
Collected 2026-08-27T02:26:04Z. Source file · JSON