Federal regulations · Through 2026-08-25 · Newer source version available

40 CFR 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:
(a) Subpart H—Zinc Reduction Furnace Wet Air Pollution Control.
PSES
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
(b) Subpart H—Preleach of Zinc Concentrates.
PSES
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
(c) Subpart H—Leaching Wet Air Pollution Control.
PSES
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
(d) Subpart H—Electrolyte Bleed Wastewater.
PSES
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
(e) Subpart H—Cathode and Anode Wash Wastewater.
PSES
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
(f) Subpart H—Casting Wet Air Pollution Control.
PSES
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
(g) Subpart H—Casting Contact Cooling.
PSES
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
(h) Subpart H—Cadmium Plant Wastewater.
PSES
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

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 H—Primary Zinc Subcategory

(a) Subpart H—Zinc Reduction Furnace Wet Air Pollution Control.

PSES