Regulations last checked for updates: May 19, 2024

Title 40 - Protection of Environment last revised: May 16, 2024
All TitlesTitle 40Chapter IPart 421Subpart AC - Subpart AC—Secondary Tungsten and Cobalt Subcategory
View all text of Subpart AC [§ 421.310 - § 421.317]
§ 421.314 - Standards of performance for new sources.

Any new source subject to this subpart shall achieve the following new source performance standards:

(a) Tungsten detergent wash and rinse.

NSPS for the Secondary Tungsten and Cobalt Subcategory

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/kg (pounds per million pounds) of tungsten scrap washed
Copper0.2500.119
Nickel0.1070.072
Ammonia (as N)25.99011.430
Cobalt0.5380.236
Tungsten0.6790.302
Oil and grease1.9501.950
Total suspended solids2.9252.340
pH( 1)( 1)

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

(b) Tungsten leaching acid.

NSPS for the Secondary Tungsten and Cobalt Subcategory

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/kg (pounds per million pounds) of tungsten produced
Copper3.2911.569
Nickel1.4140.951
Ammonia (as N)342.700150.700
Cobalt7.0963.111
Tungsten8.9473.985
Oil and grease25.71025.710
Total suspended solids38.57030.850
pH( 1)( 1)

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

(c) Tungsten post-leaching wash and rinse.

NSPS for the Secondary Tungsten and Cobalt Subcategory

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/kg (pounds per million pounds) of tungsten produced
Copper6.5833.137
Nickel2.8291.903
Ammonia (as N)685.600301.400
Tungsten17.9007.972
Cobalt14.1946.223
Oil and grease51.43051.430
Total suspended solids77.15061.720
pH( 1)( 1)

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

(d) Synthetic scheelite filtrate.

NSPS for the Secondary Tungsten and Cobalt Subcategory

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/kg (pounds per million pounds) of synthetic scheelite produced
Copper21.33010.170
Nickel9.1646.165
Ammonia (as N)2,221.000976.300
Cobalt45.98420.160
Tungsten57.98025.820
Oil and grease166.600166.600
Total suspended solids249.900199.900
pH( 1)( 1)

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

(e) Tungsten carbide leaching wet air pollution control.

NSPS for the Secondary Tungsten and Cobalt Subcategory

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/kg (pounds per million pounds) of tungsten carbide scrap leached
Copper2.2411.068
Nickel0.9630.648
Ammonia (as N)233.400102.600
Cobalt4.8332.119
Tungsten6.0932.714
Oil and grease17.51017.510
Total suspended solids26.27021.010
pH( 1)( 1)

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

(f) Tungsten carbide wash water.

NSPS for the Secondary Tungsten and Cobalt Subcategory

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/kg (pounds per million pounds) of tungsten carbide produced
Copper10.6705.083
Nickel4.5833.083
Ammonia (as N)1,111.000488.300
Cobalt22.99910.083
Tungsten29.00012.920
Oil and grease83.33083.330
Total suspended solids125.000100.000
pH( 1)( 1)

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

(g) Cobalt sludge leaching wet air pollution control.

NSPS for the Secondary Tungsten and Cobalt Subcategory

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/kg (pounds per million pounds) of cobalt produced from cobalt sludge
Copper45.8021.83
Nickel19.6813.24
Ammonia (as N)4,770.002,097.00
Cobalt98.75643.295
Tungsten124.5055.46
Oil and grease357.80357.80
Total suspended solids536.70429.40
pH( 1)( 1)

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

(h) Crystallization decant.

NSPS for the Secondary Tungsten and Cobalt Subcategory

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/kg (pounds per million pounds) of cobalt produced
Copper53.31025.410
Nickel22.91015.410
Ammonia (as N)5,552.0002,441.000
Cobalt114.95450.397
Tungsten144.90064.560
Oil and grease416.500416.500
Total suspended solids624.800499.800
pH( 1)( 1)

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

(i) Acid wash decant.

NSPS for the Secondary Tungsten and Cobalt Subcategory

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/kg (pounds per million pounds) of cobalt produced
Copper24.40011.630
Nickel10.4907.053
Ammonia (as N)2,541.0001,117.000
Cobalt52.61123.065
Tungsten66.34029.550
Oil and grease190.600190.600
Total suspended solids285.900228.700
pH( 1)( 1)

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

(j) Cobalt hydroxide filtrate.

NSPS for the Secondary Tungsten and Cobalt Subcategory

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/kg (pounds per million pounds) of cobalt produced
Copper72.51034.560
Nickel31.16020.960
Ammonia (as N)7,551.0003,320.000
Cobalt156.34668.543
Tungsten197.10087.800
Oil and grease566.500566.500
Total suspended solids849.700679.800
pH( 1)( 1)

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

(k) Cobalt hydroxide filter cake wash.

NSPS for the Secondary Tungsten and Cobalt Subcategory

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/kg (pounds per million pounds) of cobalt produced
Copper139.60066.510
Nickel59.97040.340
Ammonia (as N)14,530.0006,389.000
Cobalt300.094131.932
Tungsten379.400169.000
Oil and grease1,090.0001,090.000
Total suspended solids1,636,0001,308.000
pH( 1)( 1)

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

[50 FR 38386, Sept. 20, 1985, as amended at 55 FR 31715, 31716, 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 421.314
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