40 CFR 421.112: 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) Subpart K—Concentrate Digestion Wet Air Pollution Control.

BPT Effluent Limitations

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average

mg/kg (pounds per million pounds) of concentrate digested

Lead 2.612 1.244

Zinc 9.080 3.794

Ammonia (as N) 829.000 364.500

Fluoride 217.700 124.400

Total suspended solids 255.000 121.300

pH (1) (1)

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

(b) Subpart K—Solvent Extraction Raffinate.

BPT Effluent Limitations

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average

mg/kg (pounds per million pounds) of concentrate digested

Lead 3.888 1.851

Zinc 13.520 5.647

Ammonia (as N) 1,233.000 542.500

Fluoride 324.000 185.100

Total Suspended Solids 379.500 189.500

pH (1) (1)

Within the range of 7.5 to 10.0 at all times.

(c) Subpart K—Solvent Extraction Wet Air Pollution Control.

BPT Effluent Limitations

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average

mg/kg (pounds per million pounds) of concentrate digested

Lead 1.032 .491

Zinc 3.586 1.498

Ammonia (as N) 327.400 143.900

Fluoride 85.960 49.120

Total suspended solids 100.700 47.890

pH (1) (1)

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

(d) Subpart K—Precipitation and Filtration.

BPT Effluent Limitations

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average

mg/kg (pounds per million pounds) of concentrate digested

Lead 5.750 2.738

Zinc 19.990 8.350

Ammonia (as N) 1,825.000 802.200

Fluoride 479.100 273.800

Total suspended solids 561.300 267.000

pH (1) (1)

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

(e) Subpart K—Precipitation and Filtration Wet Air Pollution Control.

BPT Effluent Limitations

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average

mg/kg (pounds per million pounds) of concentrate digested

Lead 26.680 12.700

Zinc 92.730 38.740

Ammonia (as N) 8,466.000 3,722.000

Fluoride 2,223.000 1,270.000

Total suspended solids 2,604.000 1,239.000

pH (1) (1)

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

(f) Subpart K—Tantalum Salt Drying.

BPT Effluent Limitations

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average

mg/kg (pounds per million pounds) of tantalum salt dried

Lead 25.430 12.110

Zinc 88.390 36.930

Ammonia (as N) 8,070.000 3,548.000

Fluoride 2,119.000 1,211.000

Total suspended solids 2,482.000 1,181.000

pH (1) (1)

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

(g) Subpart K—Oxides Calcining Wet Air Pollution Control.

BPT Effluent Limitations

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average

mg/kg (pounds per million pounds) of columbium-tantalum oxide dried

Lead 16.140 7.685

Zinc 56.100 23.440

Ammonia (as N) 5,122.000 2,252.000

Fluoride 1,345.000 768.500

Total suspended solids 1,576.000 749.200

pH (1) (1)

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

(h) Subpart K—Reduction of Tantalum Salt to Metal.

BPT Effluent Limitations

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average

mg/kg (pounds per million pounds) of tantalum salt reduced

Lead 69.750 33.220

Zinc 242.500 101.300

Ammonia (as N) 22,140.000 9,732.000

Fluoride 5,813.000 3,322.000

Total suspended solids 6,809.000 3,239.000

pH (1) (1)

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

(i) Subpart K—Reduction of Tantalum Salt to Metal Wet Air Pollution Control.

BPT Effluent Limitations

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average

mg/kg (pounds per million pounds) of tantalum salt reduced

Lead .858 .409

Zinc 2.983 1.246

Ammonia (as N) 272.400 119.700

Fluoride 71.510 40.860

Total suspended solids 83.770 39.840

pH (1) (1)

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

(j) Subpart K—Tantalum Powder Wash.

BPT Effluent Limitations

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average

mg/kg (pounds per million pounds) of tantalum power washed

Lead 8.582 4.087

Zinc 29.830 12.470

Ammonia (as N) 2,724.000 1,198.000

Fluoride 715.200 408.700

Total suspended solids 837.800 398.500

pH (1) (1)

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

(k) Subpart K—Consolidation and Casting Contact Cooling.

BPT Effluent Limitations

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average

mg/kg (pounds per million pounds) of columbium or tantalum cast or consolidated

Lead .000 .000

Zinc .000 .000

Ammonia (as N) .000 .000

Fluoride .000 .000

Total suspended solids .000 .000

pH (1) (1)

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