40 CFR 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

Copper 0.371 0.195

Nickel 0.374 0.248

Ammonia (as N) 25.990 11.430

Cobalt 0.768 0.337

Tungsten 1.357 0.542

Oil and grease 3.900 2.340

Total suspended solids 7.995 3.803

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

Copper 4.885 2.571

Nickel 4.937 3.265

Ammonia (as N) 342.700 150.700

Cobalt 10.130 4.448

Tungsten 17.890 7.147

Oil and grease 51.420 30.850

Total suspended solids 105.400 50.140

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

Copper 9.772 5.143

Nickel 9.875 6.532

Ammonia (as N) 685.600 301.400

Cobalt 20.263 8.897

Tungsten 35.800 14.300

Oil and grease 102.900 61.720

Total suspended solids 210.900 100.300

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

Copper 31.660 16.660

Nickel 31.990 21.160

Ammonia (as N) 2,221.000 976.300

Cobalt 65.644 28.824

Tungsten 116.000 46.320

Oil and grease 333.200 200.000

Total suspended solids 683.100 324.900

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

Copper 3.327 1.751

Nickel 3.362 2.224

Ammonia (as N) 233.400 102.600

Cobalt 6.899 3.029

Tungsten 12.190 4.868

Oil and grease 35.020 21.010

Total suspended solids 71.790 34.150

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

Copper 15.830 8.333

Nickel 16.000 10.580

Ammonia (as N) 1,111.000 488.300

Cobalt 32.832 14.416

Tungsten 58.000 23.170

Oil and grease 166.700 100.000

Total suspended solids 341.700 162.500

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

Copper 67.990 35.780

Nickel 68.700 45.440

Ammonia (as N) 4,770.000 2,097.000

Cobalt 140.977 61.901

Tungsten 249.000 99.470

Oil and grease 715.600 429.400

Total suspended solids 1,467.000 697.700

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

Copper 79.140 41.650

Nickel 79.970 52.900

Ammonia (as N) 5,552.000 2,441.000

Cobalt 164.101 72.055

Tungsten 289.900 115.800

Oil and grease 833.000 499.800

Total suspended solids 1,708.000 812.200

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

Copper 36.220 19.060

Nickel 36.600 24.210

Ammonia (as N) 2,541.000 1,117.000

Cobalt 75.104 32.977

Tungsten 132.700 52.990

Oil and grease 381.300 228.800

Total suspended solids 781.600 371.700

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

Copper 107.600 56.650

Nickel 108.800 71.940

Ammonia (as N) 7,551.000 3,320.000

Cobalt 223.189 97.999

Tungsten 394.300 157.500

Oil and grease 1,133.000 679.800

Total suspended solids 2,323.000 1,105.000

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

Copper 207.200 109.100

Nickel 209.400 138.500

Ammonia (as N) 14,530.000 6,389.000

Cobalt 429.598 188.631

Tungsten 758.900 303.100

Oil and grease 2,181.000 1,309.000

Total suspended solids 4,471.000 2,126.000

pH (1) (1)

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