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Electronic Code of Federal Regulations

e-CFR Data is current as of July 25, 2014

Title 40: Protection of Environment
PART 421—NONFERROUS METALS MANUFACTURING POINT SOURCE CATEGORY
Subpart N—Primary Antimony Subcategory


§421.142   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 control technology currently available:

(a) Sodium Antimonate Autoclave Wastewater.

BPT Limitations for the Primary Antimony Subcategory

Pollutant or pollutant propertyMaximum for any 1 dayMaximum for monthly average
mg/kg (pounds per million pounds) of antimony contained in sodium antimonate product
Antimony44.84020.000
Arsenic32.65014.530
Mercury3.9061.562
Total suspended solids640.600304.700
pH(1)(1)

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

(b) Fouled anolyte.

BPT Limitations for the Primary Antimony Subcategory

Pollutant or pollutant propertyMaximum for any 1 dayMaximum for monthly average
mg/kg (pounds per million pounds) of antimony metal produced by electrowinning
Antimony44.84020.000
Arsenic32.65014.530
Mercury3.9061.562
Total suspended solids640.600304.700
pH(1)(1)

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

(c) Cathode Antimony Wash Water.

BPT Limitations for the Primary Antimony Subcategory

Pollutant or pollutant propertyMaximum for any 1 dayMaximum for monthly average
mg/kg (pounds per million pounds) of antimony metal produced by electrowinning
Antimony89.68040.000
Arsenic65.31029.060
Mercury7.8123.125
Total suspended solids1,281.000609.300
pH(1)(1)

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



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