Federal regulations · Through 2026-08-25 · Newer source version available

40 CFR 421.232: 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) Raw Material dust control.
BPT Limitations for the Primary Nickel and Cobalt Subcategory
Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/kg (pounds per million pounds) of copper, nickel, and cobalt in the crushed raw material
Copper 0.146 0.077
Nickel 0.148 0.098
Ammonia (as N) 10.260 4.512
Cobalt 0.016 0.007
Total suspended solids 3.157 1.502
pH (1) (1)
1 Within the range of 7.5 to 10.0 at all times.
(b) Nickel wash water.
BPT Limitations for the Primary Nickel and Cobalt Subcategory
Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/kg (pounds per million pounds) of nickel powder washed
Copper 0.064 0.034
Nickel 0.065 0.043
Ammonia (as N) 4.515 1.985
Cobalt 0.007 0.003
Total suspended solids 1.389 0.660
pH (1) (1)
1 Within the range of 7.5 to 10.0 at all times.
(c) Nickel reduction decant.
BPT Limitations for the Primary Nickel and Cobalt Subcategory
Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/kg (pounds per million pounds) of nickel produced
Copper 24.120 12.700
Nickel 24.370 16.120
Ammonia (as N) 1,692.000 743.900
Cobalt 2.666 1.143
Total suspended solids 520.500 247.600
pH (1) (1)
1 Within the range of 7.5 to 10.0 at all times.
(d) Cobalt reduction decant.
BPT Limitations for the Primary Nickel and Cobalt Subcategory
Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/kg (pounds per million pounds) of cobalt produced
Copper 40.660 21.400
Nickel 41.080 27.180
Ammonia (as N) 2,852.000 1,254.000
Cobalt 4.494 1.926
Total suspended solids 877.300 417.300
pH (1) (1)
1 Within the range of 7.5 to 10.0 at all times.

Where this section sits in the code

Title 40—Protection of Environment
CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY
SUBCHAPTER N—EFFLUENT GUIDELINES AND STANDARDS
PART 421—NONFERROUS METALS MANUFACTURING POINT SOURCE CATEGORY
Subpart U—Primary Nickel and Cobalt Subcategory

(a) Raw Material dust control.

BPT Limitations for the Primary Nickel and Cobalt Subcategory

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

mg/kg (pounds per million pounds) of copper, nickel, and cobalt in the crushed raw material

Copper 0.146 0.077

Nickel 0.148 0.098

Ammonia (as N) 10.260 4.512

Cobalt 0.016 0.007

Total suspended solids 3.157 1.502

pH (1) (1)

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

(b) Nickel wash water.

BPT Limitations for the Primary Nickel and Cobalt Subcategory

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

mg/kg (pounds per million pounds) of nickel powder washed

Copper 0.064 0.034

Nickel 0.065 0.043

Ammonia (as N) 4.515 1.985

Cobalt 0.007 0.003

Total suspended solids 1.389 0.660

pH (1) (1)

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

BPT Limitations for the Primary Nickel and Cobalt Subcategory

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

mg/kg (pounds per million pounds) of nickel produced

Copper 24.120 12.700

Nickel 24.370 16.120

Ammonia (as N) 1,692.000 743.900

Cobalt 2.666 1.143

Total suspended solids 520.500 247.600

pH (1) (1)

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

(d) Cobalt reduction decant.

BPT Limitations for the Primary Nickel and Cobalt Subcategory

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

mg/kg (pounds per million pounds) of cobalt produced

Copper 40.660 21.400

Nickel 41.080 27.180

Ammonia (as N) 2,852.000 1,254.000

Cobalt 4.494 1.926

Total suspended solids 877.300 417.300

pH (1) (1)

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

Collected 2026-08-27T02:26:04Z. Source file · JSON

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