Regulations last checked for updates: May 19, 2024

Title 40 - Protection of Environment last revised: May 16, 2024
All TitlesTitle 40Chapter IPart 421Subpart AA - Subpart AA—Secondary Tin Subcategory
View all text of Subpart AA [§ 421.290 - § 421.297]
§ 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.

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
Arsenic19.2208.554
Lead3.8631.840
Iron11.0405.611
Tin3.4952.024
Total suspended solids377.100179.400
pH( 1)( 1)

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

(b) Dealuminizing rinse.

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
Lead0.0150.007
Cyanide (total)0.0100.004
Fluoride1.2250.700
Tin0.0130.008
Total suspended solids1.4350.683
pH( 1)( 1)

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

(c) Tin mud acid neutralization filtrate.

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
Lead2.1201.009
Cyanide (total)1.4640.606
Fluoride176.600100.400
Tin1.9181.110
Total suspended solids206.90098.420
pH( 1)( 1)

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

(d) Tin hydroxide wash.

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
Lead5.0202.391
Cyanide (total)3.4661.434
Fluoride418.400237.900
Tin4.5422.630
Total suspended solids490.100233.100
pH( 1)( 1)

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

(e) Spent electrowinning solution from new scrap.

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
Lead7.0563.360
Cyanide (total)4.8722.016
Fluoride588.000334.300
Tin6.3843.696
Total suspended solids688.800327.600
pH( 1)( 1)

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

(f) Spent electrowinning solution from municipal solid waste.

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
Lead0.0500.024
Cyanide (total)0.0350.014
Fluoride4.1652.368
Tin0.0450.026
Total suspended solids4.8792.321
pH( 1)( 1)

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

(g) Tin hydroxide supernatant from scrap.

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
Lead23.37011.130
Cyanide (total)16.1406.677
Fluoride1,947.0001,107.000
Tin21.14012.240
Total suspended solids2,281.0001,085.000
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.

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
Lead48.3023.00
Cyanide (total)33.3513.80
Fluoride4,025.002,289.00
Tin43.7025.30
Total suspended solids4,715.002,243.00
pH( 1)( 1)

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

(i) Tin hydroxide filtrate.

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
Lead10.5205.009
Cyanide (total)7.2633.005
Fluoride876.500498.400
Tin9.5175.510
Total suspended solids1,027.000488.400
pH( 1)( 1)

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

authority: Secs. 301, 304 (b), (c), (e), and (g), 306 (b) and (c), 307 (b) and (c), 308 and 501 of the Clean Water Act (the Federal Water Pollution Control Act Amendments of 1972, as amended by the Clean Water Act of 1977) and the Water Quality Act of 1987 (the “Act”); 33 U.S.C. 1311,1314,c,e,and, 1316 (b) andc, 1317 (b) andc,1318; 86 Stat. 816, Pub. L. 92-500; 91 Stat. 1567, Pub. L. 95-217; 101 Stat. 7, Pub. L. 100-4
source: 49 FR 8790, Mar. 8, 1984, unless otherwise noted.
cite as: 40 CFR 421.292
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