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

  1. Law
  2. CFR 40
  3. Protection of Environment
  4. Environmental Protection Agency
  5. Effluent Guidelines and Standards
  6. Nonferrous Metals Manufacturing Point Source Category
  7. Secondary Tin Subcategory
  8. 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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§ 421.292 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 technology currently available:

(a) Tin smelter SO2 scrubber.

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BPT 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 metal produced
Arsenic 19.220 8.554
Lead 3.863 1.840
Iron 11.040 5.611
Tin 3.495 2.024
Total suspended solids 377.100 179.400
pH (1) (1)

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

(b) Dealuminizing rinse.

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BPT 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 0.015 0.007
Cyanide (total) 0.010 0.004
Fluoride 1.225 0.700
Tin 0.013 0.008
Total suspended solids 1.435 0.683
pH (1) (1)

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

(c) Tin mud acid neutralization filtrate.

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BPT Limitations for the Secondary Tin Subcategory

Pollutant or pollutant property Minimum for any 1 day Maximum for monthly average
mg/kg (pounds per million pounds) of neutralized, dewatered tin mud produced
Lead 2.120 1.009
Cyanide (total) 1.464 0.606
Fluoride 176.600 100.400
Tin 1.918 1.110
Total suspended solids 206.900 98.420
pH (1) (1)

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

(d) Tin hydroxide wash.

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BPT Limitations for the Secondary Tin Subcategory

Pollutant or pollutant property Minimum for any 1 day Maximum for monthly average
mg/kg (pounds per million pounds) of tin hydroxide washed
Lead 5.020 2.391
Cyanide (total) 3.466 1.434
Fluoride 418.400 237.900
Tin 4.542 2.630
Total suspended solids 490.100 233.100
pH (1) (1)

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

(e) Spent electrowinning solution from new scrap.

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BPT Limitations for the Secondary Tin Subcategory

Pollutant or pollutant property Minimum for any 1 day Maximum for monthly average
mg/kg (pounds per million pounds) of cathode tin produced
Lead 7.056 3.360
Cyanide (total) 4.872 2.016
Fluoride 588.000 334.300
Tin 6.384 3.696
Total suspended solids 688.800 327.600
pH (1) (1)

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

(f) Spent electrowinning solution from municipal solid waste.

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BPT Limitations for the Secondary Tin Subcategory

Pollutant or pollutant property Minimum for any 1 day Maximum for monthly average
mg/kg (pounds per million pounds) of MSW scrap used as raw material
Lead 0.050 0.024
Cyanide (total) 0.035 0.014
Fluoride 4.165 2.368
Tin 0.045 0.026
Total suspended solids 4.879 2.321
pH (1) (1)

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

(g) Tin hydroxide supernatant from scrap.

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BPT 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 23.370 11.130
Cyanide (total) 16.140 6.677
Fluoride 1,947.000 1,107.000
Tin 21.140 12.240
Total suspended solids 2,281.000 1,085.000
pH (1) (1)

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

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

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BPT 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 48.30 23.00
Cyanide (total) 33.35 13.80
Fluoride 4,025.00 2,289.00
Tin 43.70 25.30
Total suspended solids 4,715.00 2,243.00
pH (1) (1)

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

(i) Tin hydroxide filtrate.

Expand Table

BPT 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 10.520 5.009
Cyanide (total) 7.263 3.005
Fluoride 876.500 498.400
Tin 9.517 5.510
Total suspended solids 1,027.000 488.400
pH (1) (1)

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


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