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 Code of Federal Regulations (Last Updated: July 5, 2024)
 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

  § 421.85 - Pretreatment standards for existing sources.  

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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:

    (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