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

40 CFR 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.

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 S—Primary Molybdenum and Rhenium Subcategory

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.

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.

Collected 2026-08-27T02:26:04Z. Source file · JSON

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