Regulations last checked for updates: May 21, 2024

Title 40 - Protection of Environment last revised: May 17, 2024
All TitlesTitle 40Chapter IPart 461Subpart G - Subpart G—Zinc Subcategory
View all text of Subpart G [§ 461.70 - § 461.75]
§ 461.71 - Effluent limitations representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available (BPT).

(a) Except as provided in 40 CFR 125.30 through 125.32, any existing point source subject to this subpart must achieve the following effluent limitations representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available:

(1) Subpart G—Wet Amalgamated Powder Anodes.

BPT Effluent Limitations

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
Metric units—mg/kg of Zinc
English units—pounds per 1,000,000 pounds of Zinc
Chromium1.670.68
Mercury0.950.38
Silver1.560.65
Zinc5.552.32
Manganese2.581.10
Oil and grease76.045.6
TSS155.874.1
pH( 1)( 1)

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

(2) Subpart G—Gelled Amalgam Anodes.

BPT Effluent Limitations

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
Metric units—mg/kg of Zinc
English units—pounds per 1,000,000 pounds of Zinc
Chromium0.300.12
Mercury0.170.07
Silver0.280.12
Zinc0.990.42
Manganese0.460.20
Oil and grease13.68.16
TSS27.913.26
pH( 1)( 1)

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

(3) Subpart G—Zinc Oxide, Formed Anodes.

BPT Effluent Limitations

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
Metric units—mg/kg of Zinc
English units—pounds per 1,000,000 pounds of Zinc
Chromium62.925.7
Mercury35.814.3
Silver58.724.3
Zinc208.887.2
Manganese97.241.5
Oil and grease2,860.01,716.0
TSS5,863.02,789.0
pH( 1)( 1)

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

(4) Subpart G—Electrodeposited Anodes.

BPT Effluent Limitations

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
Metric units—mg/kg of zinc deposited
English units—pounds per 1,000,000 pounds of zinc deposited
Chromium1,404.0574.0
Mercury798.0319.0
Silver1,308.0543.0
Zinc4,657.01,946.0
Manganese2,169.0925.0
Oil and grease63,800.038,280.0
TSS130,700.062,210.0
pH( 1)( 1)

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

(5) Subpart G—Silver Powder, Formed Cathodes.

BPT Effluent Limitations

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
Metric units—mg/kg of silver applied
English units—pounds per 1,000,000 pounds of silver applied
Chromium86.235.3
Mercury49.019.6
Silver80.433.3
Zinc286.2119.6
Manganese133.356.8
Oil and grease3,920.02,350.0
TSS8,036.03,822.0
pH( 1)( 1)

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

(6) Subpart G—Silver Oxide Powder, Formed Cathodes.

BPT Effluent Limitations

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
Metric units—mg/kg of silver applied
English units—pounds per 1,000,000 pounds of silver applied
Chromium57.723.6
Mercury32.813.1
Silver53.722.3
Zinc191.379.9
Manganese89.138.0
Oil and grease2,620.01,570.0
TSS5,370.02,554.0
pH( 1)( 1)

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

(7) Subpart G—Silver Peroxide Cathodes.

BPT Effluent Limitations

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
Metric units—mg/kg of silver applied
English units—pounds per 1,000,000 pounds of silver applied
Chromium13.85.65
Mercury7.853.14
Silver12.95.34
Zinc45.819.2
Manganese21.49.11
Oil and grease628.0377.0
TSS1,287.0612.0
pH( 1)( 1)

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

(8) Subpart G—Nickel Impregnated Cathodes.

BPT Effluent Limitations

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
Metric units—mg/kg of nickel applied
English units—pounds per 1,000,000 pounds of nickel applied
Chromium721.6295.2
Mercury410.0164.0
Nickel3,149.02,083.0
Silver672.4279.0
Zinc2,394.41,000.4
Manganese1,115.2475.6
Oil and grease32,800.019,680.0
TSS67,240.031,980.0
pH( 1)( 1)

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

(9) Subpart G—Miscellaneous Wastewater Streams.

BPT Effluent Limitations

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
Metric units—mg/kg of cells produced
English units—pounds per 1,000,000 pounds of cells produced
Chromium3.851.58
Cyanide2.541.05
Mercury2.190.88
Nickel16.8211.12
Silver3.591.49
Zinc12.795.34
Manganese5.962.54
Oil and grease175.20105.12
TSS359.16170.82
pH( 1)( 1)

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

(10) Subpart G—Silver Etch.

BPT Effluent Limitations

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
Metric units—mg/kg of silver processed
English units—pounds per 1,000,000 pounds of silver processed
Chromium21.68.84
Mercury12.34.91
Silver20.28.35
Zinc71.730.0
Manganese33.414.3
Oil and grease982.0589.2
TSS2,013.1957.5
pH( 1)( 1)

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

(11) Subpart G—Silver Peroxide Production.

BPT Effluent Limitations

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
Metric units—mg/kg of silver peroxide processed
English units—pounds per 1,000,000 pounds of silver peroxide processed
Chromium23.09.40
Mercury13.15.22
Silver21.48.88
Zinc76.231.80
Manganese35.515.10
Oil and grease1,044.0627.00
TSS2,140.01,018.00
pH( 1)( 1)

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

(12) Subpart G—Silver Powder Production.

BPT Effluent Limitations

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
Metric units—mg/kg of silver powder processed
English units—pounds per 1,000,000 pounds of silver powder processed
Chromium9.333.82
Mercury5.302.12
Silver8.693.61
Zinc30.9512.93
Manganese14.426.15
Oil and grease424.0254.40
TSS869.0413.40
pH( 1)( 1)

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

(b) There shall be no discharge allowance for process wastewater pollutants from any battery manufacturing operation other than those battery manufacturing operations listed above.

[49 FR 9134, Mar. 9, 1984; 49 FR 13879, Apr. 9, 1984]
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) (the “Act”); 33 U.S.C. 1311,1314,c,e,and, 1316 (b) andc, 1317 (b) andc,and; 86 Stat. 816, Pub. L. 92-500; 91 Stat. 1567, Pub. L. 95-217
source: 49 FR 9134, Mar. 9, 1984, unless otherwise noted.
cite as: 40 CFR 461.71
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