40 CFR 421.115: Pretreatment standards for existing sources.

Except as provided in 40 CFR 403.7 and 403.13, any existing source subject to this subpart which introduces pollutants into a publicly owned treatment works must comply with 40 CFR part 403 and achieve the following pretreatment standards for existing sources. The mass of wastewater pollutants in primary columbium-tantalum process wastewater introduced into a POTW shall not exceed the following values:

(a) Subpart K—Concentrate Digestion Wet Air Pollution Control.

PSES

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.

PSES

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.

PSES

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.

PSES

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.

PSES

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.

PSES

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.

PSES

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 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.

PSES

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.

PSES

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

Ammonia (as N) 272.400 119.700

Fluoride 71.510 40.860

(j) Subpart K—Tantalum Powder Wash.

PSES

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.

PSNS

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