Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best available technology economically achievable.

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 available technology economically achievable: (a) Subpart K—Concentrate Digestion Wet Air Pollution Control. BAT 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 .174 .081 Zinc .635 .261 Ammonia (as N) 82.910 36.450 Fluoride 21.770 12.440 (b) Subpart K—Solvent Extraction Raffinate. BAT 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 2.592 1.203 Zinc 9.442 3.888 Ammonia (as N) 1,233.000 542.5000 Fluoride 324.000 185.100 (c) Subpart K—Solvent Extraction Wet Air Pollution Control. BAT 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 .069 .032 Zinc .251 .103 Ammonia (as N) 32.790 14.420 Fluoride 8.610 4.920 (d) Subpart K—Precipitation and Filtration. BAT 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 3.833 1.780 Zinc 13.960 5.750 Ammonia (as N) 1,825.000 802.200 Fluoride 479.100 273.800 (e) Subpart K—Precipitation and Filtration Wet Air Pollution Control. BAT 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 1.778 .826 Zinc 6.478 2.668 Ammonia (as N) 846.600 372.200 Fluoride 222.300 127.000 (f) Subpart K—Tantalum Salt Drying. BAT 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 16.950 7.871 Zinc 61.750 25.430 Ammonia (as N) 8,070.000 3,548.000 Fluoride 2,119.000 1,211.000 (g) Subpart K—Oxides Calcining Wet Air Pollution Control. BAT 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 Lead 1.076 .500 Zinc 3.919 1.614 Ammonia (as N) 512.200 225.200 Fluoride 134.500 76.840 (h) Subpart K—Reduction of Tantalum Salt to Metal. BAT 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 46.500 21.590 Zinc 169.400 69.750 Ammonia (as N) 22,140.000 9,732.000 Fluoride 5,813.000 3,322.000 (i) Subpart K—Reduction of Tantalum Salt to Metal Wet Air Pollution Control. BAT 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 .572 .266 Zinc 2.084 .858 Fluoride 71.510 40.860 (j) Subpart K—Tantalum Powder Wash. BAT Effluent Limitations Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average mg/kg (pounds per million pounds) of tantalum powder washed Lead 5.721 2.656 Zinc 20.840 8.582 Ammonia (as N) 2,724.000 1,198.000 Fluoride 715.200 408.700 (k) Subpart K—Consolidation and Casting Contact Cooling. BAT 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 [49 FR 8817, Mar. 8, 1984, as amended at 50 FR 12253, Mar. 28, 1985]