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]
§ 421.312 - 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) Tungsten detergent wash and rinse.

BPT Limitations 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
Copper0.3710.195
Nickel0.3740.248
Ammonia (as N)25.99011.430
Cobalt0.7680.337
Tungsten1.3570.542
Oil and grease3.9002.340
Total suspended solids7.9953.803
pH( 1)( 1)

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

(b) Tungsten leaching acid.

BPT Limitations 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
Copper4.8852.571
Nickel4.9373.265
Ammonia (as N)342.700150.700
Cobalt10.1304.448
Tungsten17.8907.147
Oil and grease51.42030.850
Total suspended solids105.40050.140
pH( 1)( 1)

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

(c) Tungsten post-leaching wash and rinse.

BPT Limitations 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
Copper9.7725.143
Nickel9.8756.532
Ammonia (as N)685.600301.400
Cobalt20.2638.897
Tungsten35.80014.300
Oil and grease102.90061.720
Total suspended solids210.900100.300
pH( 1)( 1)

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

(d) Synthetic scheelite filtrate.

BPT Limitations 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
Copper31.66016.660
Nickel31.99021.160
Ammonia (as N)2,221.000976.300
Cobalt65.64428.824
Tungsten116.00046.320
Oil and grease333.200200.000
Total suspended solids683.100324.900
pH( 1)( 1)

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

(e) Tungsten carbide leaching wet air pollution control.

BPT Limitations 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
Copper3.3271.751
Nickel3.3622.224
Ammonia (as N)233.400102.600
Cobalt6.8993.029
Tungsten12.1904.868
Oil and grease35.02021.010
Total suspended solids71.79034.150
pH( 1)( 1)

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

(f) Tungsten carbide wash water.

BPT Limitations 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
Copper15.8308.333
Nickel16.00010.580
Ammonia (as N)1,111.000488.300
Cobalt32.83214.416
Tungsten58.00023.170
Oil and grease166.700100.000
Total suspended solids341.700162.500
pH( 1)( 1)

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

(g) Cobalt sludge leaching wet air pollution control.

BPT Limitations 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
Copper67.99035.780
Nickel68.70045.440
Ammonia (as N)4,770.0002,097.000
Cobalt140.97761.901
Tungsten249.00099.470
Oil and grease715.600429.400
Total suspended solids1,467.000697.700
pH( 1)( 1)

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

(h) Crystallization decant.

BPT Limitations 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
Copper79.14041.650
Nickel79.97052.900
Ammonia (as N)5,552.0002,441.000
Cobalt164.10172.055
Tungsten289.900115.800
Oil and grease833.000499.800
Total suspended solids1,708.000812.200
pH( 1)( 1)

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

(i) Acid wash decant.

BPT Limitations 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
Copper36.22019.060
Nickel36.60024.210
Ammonia (as N)2,541.0001,117.000
Cobalt75.10432.977
Tungsten132.70052.990
Oil and grease381.300228.800
Total suspended solids781.600371.700
pH( 1)( 1)

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

(j) Cobalt hydroxide filtrate.

BPT Limitations 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
Copper107.60056.650
Nickel108.80071.940
Ammonia (as N)7,551.0003,320.000
Cobalt223.18997.999
Tungsten394.300157.500
Oil and grease1,133.000679.800
Total suspended solids2,323.0001,105.000
pH( 1)( 1)

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

(k) Cobalt hydroxide filter cake wash.

BPT Limitations 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
Copper207.200109.100
Nickel209.400138.500
Ammonia (as N)14,530.0006,389.000
Cobalt429.598188.631
Tungsten758.900303.100
Oil and grease2,181.0001,309.000
Total suspended solids4,471.0002,126.000
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 31713, 31714, 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 421.312
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