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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 T - Secondary Molybdenum and Vanadium Subcategory

  § 421.222 - Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available.  

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  • § 421.222 Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available.

    Except as provided in 40 CFR 125.30 through 125.32, any existing point source subject to this subpart shall achieve the following effluent limitations representing the degree of effluent reduction attainable by the application of the best practicable technology currently available:

    (a) Leach tailings.

    BPT Limitations for the Secondary Molybdenum and Vanadium Subcategory

    Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
    mg/kg (pounds per million pounds) of technical grade molybdenum plus vanadium plus pure grade molybdenum produced
    Arsenic 40.778 18.145
    Chromium 8.585 3.512
    Lead 8.195 3.902
    Nickel 37.460 24.779
    Iron 23.410 11.902
    Molybdenum [Reserved] [Reserved]
    Ammonia (as N) 8078.000 3551.000
    Total Suspended Solids 799.950 380.460
    pH (1) (1)

    1 Within the range of 7.5 to 10.0 at all times.

    (b) Molybdenum filtrate solvent extraction raffinate.

    BPT Limitations for the Secondary Molybdenum and Vanadium Subcategory

    Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
    mg/kg (pounds per million pounds) of technical grade molybdenum plus vanadium plus pure grade molybdenum produced
    Arsenic 121.720 54.162
    Chromium 25.625 10.483
    Lead 24.460 11.648
    Nickel 111.819 73.964
    Iron 69.887 35.526
    Molybdenum [Reserved] [Reserved]
    Ammonia (as N) 24114.000 10600.000
    Total Suspended Solids 2387.800 1135.660
    pH (1) (1)

    1 Within the range of 7.5 to 10.0 at all times.

    (c) Vanadium decomposition wet air pollution control.

    BPT Limitations for the Secondary Molybdenum and Vanadium Subcategory

    Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
    mg/kg (pounds per million pounds) of vanadium produced by decomposition
    Arsenic 0.000 0.000
    Chromium 0.000 0.000
    Lead 0.000 0.000
    Nickel 0.000 0.000
    Iron 0.000 0.000
    Molybdenum 0.000 0.000
    Ammonia (as N) 0.000 0.000
    Total suspended solids 0.000 0.000
    pH (1) (1)

    1 Within the range of 7.5 to 10.0 at all times.

    (d) Molybdenum drying wet air pollution control.

    BPT Limitations for the Secondary Molybdenum and Vanadium Subcategory

    Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
    mg/kg (pounds per million pounds) of molybdenum produced
    Arsenic 0.000 0.000
    Chromium 0.000 0.000
    Lead 0.000 0.000
    Nickel 0.000 0.000
    Iron 0.000 0.000
    Molybdenum 0.000 0.000
    Ammonia (as N) 0.000 0.000
    Total suspended solids 0.000 0.000
    pH (1) (1)

    1 Within the range of 7.5 to 10.0 at all times.

    (e) Pure Grade Molybdenum.

    BPT Limitations for the Secondary Molybdenum and Vanadium Subcategory

    Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
    mg/kg (pounds per million pounds) of pure molybdenum produced
    Arsenic 48.655 21.650
    Chromium 10.243 4.190
    Lead 9.778 4.656
    Nickel 44.698 29.566
    Iron 27.936 14.201
    Molybdenum [Reserved] [Reserved]
    Ammonia (as N) 9638.000 4237.000
    Total Suspended Solids 954.480 453.960
    pH (1) (1)

    1 Within the range of 7.5 to 10.0 at all times.

    [50 FR 38357, Sept. 20, 1985, as amended at 55 FR 31703, Aug. 3, 1990]