Regulations last checked for updates: May 19, 2024

Title 40 - Protection of Environment last revised: May 16, 2024
All TitlesTitle 40Chapter IPart 421Subpart Z - Subpart Z—Secondary Tantalum Subcategory
View all text of Subpart Z [§ 421.280 - § 421.287]
§ 421.282 - 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) Tantalum alloy leach and rinse.

BPT Limitations for the Secondary Tantalum Subcategory

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/kg (pounds per million pounds) of tantalum powder produced
Copper438.100230.600
Lead96.85046.120
Nickel442.800292.900
Zinc336.700140.700
Tantalum103.800
Total suspended solids9,455.0004,497.000
pH( 1)( 1)

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

(b) Capacitor leach and rinse.

BPT Limitations for the Secondary Tantalum Subcategory

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/kg (pounds per million pounds) of tantalum powder produced from leaching
Copper38.38020.200
Lead8.4844.040
Nickel38.78025.650
Zinc29.49012.320
Tantalum9.090
Total suspended solids828.200393.900
pH( 1)( 1)

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

(c) Tantalum sludge leach and rinse.

BPT Limitations for the Secondary Tantalum Subcategory

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/kg (pounds per million pounds) of equivalent pure tantalum powder produced
Copper390.100205.300
Lead86.23041.060
Nickel394.200260.700
Zinc299.700125.200
Tantalum92.390
Total suspended solids8,417.0004,003.000
pH( 1)( 1)

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

(d) Tantalum powder acid wash and rinse.

BPT Limitations for the Secondary Tantalum Subcategory

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/kg (pounds per million pounds) of tantalum powder produced
Copper0.6650.350
Lead0.1470.070
Nickel0.6720.445
Zinc0.5110.214
Tantalum0.158
Total suspended solids14.3506.825
pH( 1)( 1)

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

(e) Leaching wet air pollution control.

BPT Limitations for the Secondary Tantalum Subcategory

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/kg (pounds per million pounds) of equivalent pure tantalum powder produced
Copper9.2724.880
Lead2.0500.976
Nickel9.3706.198
Zinc7.1252.977
Tantalum2.196
Total suspended solids200.10095.160
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 421.282
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