CFR > Title 40 - Protection of Environment > CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY > SUBCHAPTER N—EFFLUENT GUIDELINES AND STANDARDS (Parts 400–471) > PART 421—NONFERROUS METALS MANUFACTURING POINT SOURCE CATEGORY > SUBPART T—Secondary Molybdenum and Vanadium Subcategory (§421.220 to §421.227) > 421.222—Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available.

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
Code of Federal Regulations 559
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]