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Title 40

Displaying title 40, up to date as of 10/06/2026. Title 40 was last amended 10/02/2026.
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Subpart H—Primary Zinc Subcategory

Source:

49 FR 8808, Mar. 8, 1984, unless otherwise noted.

§ 421.80 Applicability: Description of the primary zinc subcategory.

The provisions of this subpart are applicable to discharges resulting from the production of primary zinc by either electrolytic or pyrolytic means.

§ 421.81 Specialized definitions.

For the purpose of this subpart:

(a) Except as provided below, the general definitions, abbreviations, and methods of analysis set forth in 40 CFR part 401 shall apply to this subpart.

(b) The term product shall mean zinc metal.

§ 421.82 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:

Effluent Limitations

Effluent characteristics Maximum for any 1 day Average of Daily values for 30 consecutive days shall not exceed
(1) Metric Units (kg/kkg of product)
(1) English Units (pounds per 1,000 pounds of product)
TSS 0.42 0.21
As 0.0016 0.0008
Cd 0.008 0.004
Se 0.08 0.04
Zn 0.08 0.04
pH (1) (1)
Within the range of 6.0 to 9.0.

[49 FR 8808, Mar. 8, 1984; 49 FR 26739, June 29, 1984]

§ 421.83 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) Subpart H—Zinc Reduction Furnace Wet Air Pollution Control.

BAT Effluent Limitations

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/kg (pounds per million pounds) of zinc reduced
Cadmium .334 .134
Copper 2.135 1.018
Lead .467 .217
Zinc 1.702 .701

(b) Subpart H—Preleach of Zinc Concentrates.

BAT Effluent Limitations

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/kg (pounds per million pounds) of concentrate leached
Cadmium .180 .072
Copper 1.153 .550
Lead .252 .117
Zinc .919 .378

(c) Subpart H—Leaching Wet Air Pollution Control.

BAT Effluent Limitations

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/kg (pounds per million pounds) of zinc processed through leaching
Cadmium .000 .000
Copper .000 .000
Lead .000 .000
Zinc .000 .000

(d) Subpart H—Electrolyte Bleed Wastewater.

BAT Effluent Limitations

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/kg (pounds per million pounds) of cathode zinc produced
Cadmium .086 .035
Copper .553 .264
Lead .121 .056
Zinc .441 .182

(e) Subpart H—Cathode and Anode Wash Wastewater.

BAT Effluent Limitations

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/kg (pounds per million pounds) of cathode zinc produced
Cadmium .150 .060
Copper .961 .458
Lead .210 .098
Zinc .766 .315

(f) Subpart H—Casting Wet Air Pollution Control.

BAT Effluent Limitations

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/kg (pounds per million pounds) of zinc cast
Cadmium .051 .021
Copper .329 .157
Lead .072 .033
Zinc .262 .108

(g) Subpart H—Casting Contact Cooling.

BAT Effluent Limitations

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/kg (pounds per million pounds) of zinc cast
Cadmium .036 .014
Copper .232 .110
Lead .051 .024
Zinc .185 .076

(h) Subpart H—Cadmium Plant Wastewater.

BAT Effluent Limitations

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/kg (pounds per million pounds) of cadmium produced
Cadmium 1.234 .494
Copper 7.899 3.765
Lead 1.728 .802
Zinc 6.295 2.592

§ 421.84 Standards of performance for new sources.

Any new source subject to this subpart shall achieve the following new source performance standards:

(a) Subpart H—Zinc Reduction Furnace Wet Air Pollution Control.

NSPS

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/kg (pounds per million pounds) of zinc reduced
Cadmium .334 .134
Copper 2.135 1.018
Lead .467 .217
Zinc 1.702 .701
Total suspended solids 25.020 20.020
pH (1) (1)
1 Within the range of 7.5 to 10.0 at all times.

(b) Subpart H—Preleach of Zinc Concentrates.

NSPS

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/kg (pounds per million pounds) of concentrate leached
Cadmium .180 .072
Copper 1.153 .550
Lead .252 .117
Zinc .919 .378
Total suspended solids 13.520 10.810
pH (1) (1)
1 Within the range of 7.5 to 10.0 at all times.

(c) Subpart H—Leaching Wet Air Pollution Control.

NSPS

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/kg (pounds per million pounds) of zinc processed through leaching
Cadmium .000 .000
Copper .000 .000
Lead .000 .000
Zinc .000 .000
Total suspended solids .000 .000
pH (1) (1)
1 Within the range of 7.5 to 10.0 at all times.

(d) Subpart H—Electrolyte Bleed Wastewater.

NSPS

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/kg (pounds per million pounds) of cathode zinc produced
Cadmium .086 .035
Copper .553 .264
Lead .121 .056
Zinc .441 .182
Total suspended solids 6.480 5.184
pH (1) (1)
1 Within the range of 7.5 to 10.0 at all times.

(e) Subpart H—Cathode and Anode Wash Wastewater.

NSPS

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/kg (pounds per million pounds) of cathode zinc produced
Cadmium .150 .060
Copper .961 .458
Lead .210 .098
Zinc .766 .315
Total suspended solids 11.270 9.012
pH (1) (1)
1 Within the range of 7.5 to 10.0 at all times.

(f) Subpart H—Casting Wet Air Pollution Control.

NSPS

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/kg (pounds per million pounds) of zinc cast
Cadmium .051 .021
Copper .329 .157
Lead .072 .033
Zinc .262 .108
Total suspended solids 3.855 3.084
pH (1) (1)
1 Within the range of 7.5 to 10.0 at all times.

(g) Subpart H—Casting Contact Cooling.

NSPS

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/kg (pounds per million pounds) of zinc cast
Cadmium .036 .014
Copper .232 .110
Lead .051 .024
Zinc .185 .076
Total suspended solids 2.715 2.172
pH (1) (1)
1 Within the range of 7.5 to 10.0 at all times.

(h) Subpart H—Cadmium Plant Wastewater.

NSPS

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/kg (pounds per million pounds) of cadmium produced
Cadmium 1.234 .494
Copper 7.899 3.765
Lead 1.728 .802
Zinc 6.295 2.592
Total suspended solids 92.570 74.050
pH (1) (1)
1 Within the range of 7.5 to 10.0 at all times.

[49 FR 8808, Mar. 8, 1984; 49 FR 26739, June 29, 1984, as amended at 49 FR 29795, July 24, 1984]

§ 421.85 Pretreatment standards for existing sources.

Except as provided in 40 CFR 403.7 and 403.13, any existing source subject to this subpart which introduces pollutants into a publicly owned treatment works must comply with 40 CFR part 403 and achieve the following pretreatment standards for existing sources. The mass of wastewater pollutants in primary zinc process wastewater introduced into a POTW shall not exceed the following values:

(a) Subpart H—Zinc Reduction Furnace Wet Air Pollution Control.

PSES

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/kg (pounds per million pounds) of zinc reduced
Cadmium .334 .134
Zinc 1.702 .701

(b) Subpart H—Preleach of Zinc Concentrates.

PSES

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/kg (pounds per million pounds) of concentrate leached
Cadmium .180 .072
Zinc .919 .378

(c) Subpart H—Leaching Wet Air Pollution Control.

PSES

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/kg (pounds per million pounds) of zinc processed through leaching
Cadmium .000 .000
Zinc .000 .000

(d) Subpart H—Electrolyte Bleed Wastewater.

PSES

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/kg (pounds per million pounds) of cathode zinc produced
Cadmium .086 .035
Zinc .441 .182

(e) Subpart H—Cathode and Anode Wash Wastewater.

PSES

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/kg (pounds per million pounds) of cathode zinc produced
Cadmium .150 .060
Zinc .766 .315

(f) Subpart H—Casting Wet Air Pollution Control.

PSES

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/kg (pounds per million pounds) of zinc cast
Cadmium .051 .021
Zinc .262 .108

(g) Subpart H—Casting Contact Cooling.

PSES

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/kg (pounds per million pounds) of zinc cast
Cadmium .036 .014
Zinc .185 .076

(h) Subpart H—Cadmium Plant Wastewater.

PSES

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/kg (pounds per million pounds) of cadmium produced
Cadmium 1.234 .494
Zinc 6.295 2.592

§ 421.86 Pretreatment standards for new sources.

Except as provided in 40 CFR 403.7, any new source subject to this subpart which introduces pollutants into a publicly owned treatment works must comply with 40 CFR part 403 and achieve the following pretreatment standards for new sources. The mass of wastewater pollutants in primary zinc process wastewaters introduced into a POTW shall not exceed the following values:

(a) Subpart H—Zinc Reduction Furnace Wet Air Pollution Control.

PSNS

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/kg (pounds per million pounds) of zinc reduced
Cadmium .334 .134
Zinc 1.702 .701

(b) Subpart H—Preleach of Zinc Concentrates.

PSNS

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/kg (pounds per million pounds) of concentrate leached
Cadmium .180 .072
Zinc .919 .378

(c) Subpart H—Leaching Wet Air Pollution Control.

PSNS

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/kg (pounds per million pounds) of zinc processed through leaching
Cadmium .000 .000
Zinc .000 .000

(d) Subpart H—Electrolyte Bleed Wastewater.

PSNS

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/kg (pounds per million pounds) of cathode zinc produced
Cadmium .086 .035
Zinc .441 .182

(e) Subpart H—Cathode and Anode Wash Wastewater.

PSNS

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/kg (pounds per million pounds) of cathode zinc produced
Cadmium .150 .060
Zinc .766 .315

(f) Subpart H—Casting Wet Air Pollution Control.

PSNS

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/kg (pounds per million pounds) of zinc cast
Cadmium .051 .021
Zinc .262 .108

(g) Subpart H—Casting Contact Cooling.

PSNS

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/kg (pounds per million pounds) of zinc cast
Cadmium 0.036 0.014
Zinc 0.185 0.076

(h) Subpart H—Cadmium Plant Wastewater.

PSNS

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/kg (pounds per million pounds) of cadmium produced
Cadmium 1.234 0.494
Zinc 6.295 2.592

§ 421.87 [Reserved]