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 S—Primary Molybdenum and Rhenium Subcategory (§421.210 to §421.217) > 421.216—Pretreatment standards for new sources.

421.216—Pretreatment standards for new sources.

Except as provided in 40 CFR 403.7, any new source subject to this subpart which introduces pollutants into a publicly owned treatment works must comply with 40 CFR part 403 and achieve the following pretreatment standards for new sources. The mass of wastewater pollutants in primary molybdenum and rhenium process wastewater introduced into a POTW shall not exceed the following values:
(a) Molybdenum sulfide leachate.
PSNS 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
(b) Roaster SO2 scrubber.
PSNS 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
(c) Molybdic oxide leachate.
PSNS 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
(d) Hydrogen reduction furnace scrubber.
PSNS 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
(e) Depleted rhenium scrubbing solution.
PSNS 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
[50 FR 38355, Sept. 20, 1985, as amended at 55 FR 31702, 31703, Aug. 3, 1990]