40 CFR 421.212: 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 limitation representing the degree of effluent reduction attainable by the application of the best practicable technology currently available:

(a) Molybdenum sulfide leachate.

BPT Limitations for the Primary Molybdenum Rhenium Subcategory

Pollutant or pollutant property Maximum for any 1 day Maximum monthly average

mg/kg (pounds per million pounds) of molybdenum sulfide leached

Arsenic 0.968 0.431

Lead 0.195 0.093

Nickle 0.889 0.588

Selenium 0.570 0.255

Molybdenum [Reserved] [Reserved].

Ammonia (as N) 61.720 27.130

Fluoride 16.210 9.214

Total suspended solids 18.980 9.029

pH (1) (1)

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

(b) Roaster SO2 scrubber.

BPT Limitations for the Primary Molybdenum and Rhenium Subcategory

Pollutant of pollutant property Maximum for any 1 day Maximum for monthly average

mg/kg (pounds per million pounds) of molybdenum sulfide roasted

Arsenic 3.509 1.561

Lead 0.705 0.336

Nickel 3.224 2.133

Selenium 2.065 0.924

Molybdenum [Reserved] [Reserved].

Ammonia (as N) 223.800 98.390

Fluoride 58.770 33.410

Total suspended solids 68.840 32.740

pH (1) (1)

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

(c) Molybdic oxide leachate.

BPT Limitations 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 24.210 10.770

Lead 4.865 2.317

Nickel 22.240 14.710

Selenium 14.250 6.371

Molybdenum [Reserved] [Reserved]

Ammonia (as N) 1,544.000 678.800

Fluoride 405.400 230.500

Total suspended solids 474.900 225.900

pH (1) (1)

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

(d) Hydrogen reduction furnace scrubber.

BPT Limitations 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 47.860 21.300

Lead 9.617 4.580

Nickel 43.970 29.080

Selenium 28.170 12.600

Molybdenum [Reserved] [Reserved]

Ammonia (as N) 3,052.000 1,342.000

Fluoride 801.400 455.700

Total suspended solids 938.800 446.500

pH (1) (1)

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

(e) Depleted rhenium scrubbing solution.

BPT Limitations 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 1.497 0.666

Lead 0.301 0.143

Nickel 1.375 0.909

Selenium 0.881 0.394

Molybdenum [Reserved] [Reserved]

Ammonia (as N) 95.440 41.960

Fluoride 25.060 14.250

Total suspended solids 29.360 13.960

pH (1) (1)

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