StacksVerified U.S. regulatory reference

40 CFR §421.116

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
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 columbium-tantalum process wastewater introduced into a POTW shall not exceed the following values:
  1. (a)Subpart K—Concentrate Digestion Wet Air Pollution Control.
  2. (b)Subpart K—Solvent Extraction Raffinate.
  3. (c)Subpart K—Solvent Extraction Wet Air Pollution Control.
  4. (d)Subpart K—Precipitation and Filtration.
  5. (e)Subpart K—Precipitation and Filtration Wet Air Pollution Control.
  6. (f)Subpart K—Tantalum Salt Drying.
  7. (g)Subpart K—Oxides Calcining Wet Air Pollution Control.
  8. (h)Subpart K—Reduction of Tantalum Salt to Metal.
  9. (i)Subpart K—Reduction of Tantalum Salt to Metal Wet Air Pollution Control.
  10. (j)Subpart K—Tantalum Powder Wash.
  11. (k)Subpart K—Consolidation and Casting Contact Cooling.