Regulations last checked for updates: May 19, 2024

Title 40 - Protection of Environment last revised: May 16, 2024
All TitlesTitle 40Chapter IPart 421Subpart S - Subpart S—Primary Molybdenum and Rhenium Subcategory
View all text of Subpart S [§ 421.210 - § 421.217]
§ 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
Arsenic0.9680.431
Lead0.1950.093
Nickle0.8890.588
Selenium0.5700.255
Molybdenum[Reserved][Reserved].
Ammonia (as N)61.72027.130
Fluoride16.2109.214
Total suspended solids18.9809.029
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
Arsenic3.5091.561
Lead0.7050.336
Nickel3.2242.133
Selenium2.0650.924
Molybdenum[Reserved][Reserved].
Ammonia (as N)223.80098.390
Fluoride58.77033.410
Total suspended solids68.84032.740
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
Arsenic24.21010.770
Lead4.8652.317
Nickel22.24014.710
Selenium14.2506.371
Molybdenum[Reserved][Reserved]
Ammonia (as N)1,544.000678.800
Fluoride405.400230.500
Total suspended solids474.900225.900
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
Arsenic47.86021.300
Lead9.6174.580
Nickel43.97029.080
Selenium28.17012.600
Molybdenum[Reserved][Reserved]
Ammonia (as N)3,052.0001,342.000
Fluoride801.400455.700
Total suspended solids938.800446.500
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
Arsenic1.4970.666
Lead0.3010.143
Nickel1.3750.909
Selenium0.8810.394
Molybdenum[Reserved][Reserved]
Ammonia (as N)95.44041.960
Fluoride25.06014.250
Total suspended solids29.36013.960
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 31701, Aug. 3, 1990]
authority: Secs. 301, 304 (b), (c), (e), and (g), 306 (b) and (c), 307 (b) and (c), 308 and 501 of the Clean Water Act (the Federal Water Pollution Control Act Amendments of 1972, as amended by the Clean Water Act of 1977) and the Water Quality Act of 1987 (the “Act”); 33 U.S.C. 1311,1314,c,e,and, 1316 (b) andc, 1317 (b) andc,1318; 86 Stat. 816, Pub. L. 92-500; 91 Stat. 1567, Pub. L. 95-217; 101 Stat. 7, Pub. L. 100-4
source: 49 FR 8790, Mar. 8, 1984, unless otherwise noted.
cite as: 40 CFR 421.212
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