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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 S - Primary Molybdenum and Rhenium Subcategory

  § 421.214 - Standards of performance for new sources.  

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  • § 421.214 Standards of performance for new sources.

    Any new source subject to this subpart shall achieve the following new source performance standards:

    (a) Molybdenum sulfide leachate.

    NSPS for the Primary Molybdenum and Rhenium Subcategory

    Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
    mg/kg (pounds per million pounds) of molybdenum sulfide leached
    Arsenic 0.644 0.287
    Lead 0.130 0.060
    Nickel 0.255 0.171
    Selenium 0.380 0.171
    Molybdenum [Reserved] [Reserved].
    Ammonia (as N) 61.720 27.130
    Fluoride 16.210 9.214
    Total suspended solids 6.945 5.556
    pH (1) (1)

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

    (b) Roaster SO2 scrubber.

    NSPS for the Primary Molybdenum and Rhenium Subcategory

    Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
    mg/kg (pounds per million pounds) of molybdenum sulfide roasted
    Arsenic 2.334 1.041
    Lead 0.470 0.218
    Nickel 0.924 0.621
    Selenium 1.377 0.621
    Molybdenum [Reserved] [Reserved].
    Ammonia (as N) 223.800 98.390
    Fluoride 58.770 33.410
    Total suspended solids 25.190 20.150
    pH (1) (1)

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

    (c) Molybdic oxide leachate.

    NSPS for the Primary Molybdenum and Rhenium Subcategory

    Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
    mg/kg (pounds per million pounds) of molybdenum contained in molybdic oxide leached
    Arsenic 16.100 7.182
    Lead 3.244 1.506
    Nickel 6.371 4.286
    Selenium 9.499 4.286
    Molybdenum [Reserved] [Reserved].
    Ammonia (as N) 1,544.000 678.800
    Fluoride 405.400 230.500
    Total suspended solids 173.800 139.000
    pH (1) (1)

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

    (d) Hydrogen reduction furnace scrubber.

    NSPS for the Primary Molybdenum and Rhenium Subcategory

    Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
    mg/kg (pounds per million pounds) of molybdenum metal powder produced
    Arsenic 3.183 1.420
    Lead 0.641 0.298
    Nickel 1.260 0.847
    Selenium 1.878 0.847
    Molybdenum [Reserved] [Reserved].
    Ammonia (as N) 305.300 134.200
    Fluoride 80.150 45.570
    Total suspended solids 34.350 27.480
    pH (1) (1)

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

    (e) Depleted rhenium scrubbing solution.

    NSPS for the Primary Molybdenum and Rhenium Subcategory

    Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
    mg/kg (pounds per million pounds) of molybdenum sulfide roasted
    Arsenic 0.995 0.444
    Lead 0.201 0.093
    Nickel 0.394 0.265
    Selenium 0.587 0.265
    Molybdenum [Reserved] [Reserved].
    Ammonia (as N) 95.440 41.960
    Fluoride 25.060 14.250
    Total suspended solids 10.740 8.592
    pH (1) (1)

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

    [50 FR 38355, Sept. 20, 1985, as amended at 55 FR 31702, Aug. 3, 1990]