40 CFR 421.142 - Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available.

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§ 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 property Maximum for any 1 day Maximum for monthly average
mg/kg (pounds per million pounds) of antimony contained in sodium antimonate product
Antimony 44.840 20.000
Arsenic 32.650 14.530
Mercury 3.906 1.562
Total suspended solids 640.600 304.700
pH ( 1) ( 1)

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

(b) Fouled anolyte.

BPT Limitations for the Primary Antimony Subcategory

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/kg (pounds per million pounds) of antimony metal produced by electrowinning
Antimony 44.840 20.000
Arsenic 32.650 14.530
Mercury 3.906 1.562
Total suspended solids 640.600 304.700
pH ( 1) ( 1)

1 Within 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 property Maximum for any 1 day Maximum for monthly average
mg/kg (pounds per million pounds) of antimony metal produced by electrowinning
Antimony 89.680 40.000
Arsenic 65.310 29.060
Mercury 7.812 3.125
Total suspended solids 1,281.000 609.300
pH ( 1) ( 1)

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

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