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.