40 CFR 421.293: 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) Tin smelter SO2 scrubber.

BAT Limitations for the Secondary Tin Subcategory

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average

mg/kg (pounds per million pounds) of crude tapped tin produced

Arsenic 12.790 5.703

Lead 2.575 1.196

Iron 11.040 5.611

Tin 3.495 2.024

(b) Dealuminizing rinse.

BAT Limitations for the Secondary Tin Subcategory

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average

mg/kg (pounds per million pounds) of dealuminized scrap produced

Lead 0.010 0.005

Cyanide (total) 0.007 0.003

Fluoride 1.225 0.697

Tin 0.013 0.008

(c) Tin mud acid neutralization filtrate.

BAT Limitations for the Secondary Tin Subcategory

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average

mg/kg (pounds per million pounds) of neutralized dewatered tin mud produced

Lead 1.413 0.656

Cyanide (total) 1.009 0.404

Fluoride 176.600 100.400

Tin 1.918 1.110

(d) Tin hydroxide wash.

BAT Limitations for the Secondary Tin Subcategory

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average

mg/kg (pounds per million pounds) of tin hydroxide washed

Lead 3.347 1.554

Cyanide (total) 2.391 0.956

Fluoride 418.400 237.900

Tin 4.542 2.630

(e) Spent electrowinning solution from new scrap.

BAT Limitations for the Secondary Tin Subcategory

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average

mg/kg (pounds per million pounds) of cathode tin produced

Lead 4.704 2.184

Cyanide (total) 3.360 1.344

Fluoride 588.000 334.300

Tin 6.384 3.696

(f) Spent electrowinning solution from municipal solid waste.

BAT Limitations for the Secondary Tin Subcategory

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average

mg/kg (pounds per million pounds) of MSW scrap used as raw material

Lead 0.033 0.015

Cyanide (total) 0.024 0.010

Fluoride 4.165 2.368

Tin 0.045 0.026

(g) Tin hydroxide supernatant from scrap.

BAT Limitations for the Secondary Tin Subcategory

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average

mg/kg (pounds per million pounds) of tin metal recovered from scrap

Lead 15.580 7.233

Cyanide (total) 11.130 4.451

Fluoride 1,947.000 1,107.000

Tin 21.140 21.240

(h) Tin hydroxide supernatant from plating solutions and sludges.

BAT Limitations for the Secondary Tin Subcategory

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average

mg/kg (pounds per million pounds) of tin metal recovered from plating solutions and sludges

Lead 32.20 14.95

Cyanide (total) 23.00 9.20

Fluoride 4,025.00 2,289.00

Tin 43.70 25.30

(i) Tin hydroxide filtrate.

BAT Limitations for the Secondary Tin Subcategory

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average

mg/kg (pounds per million pounds) of tin metal produced

Lead 7.012 3.256

Cyanide (total) 5.009 2.004

Fluoride 876.500 498.400

Tin 9.517 5.510