40 CFR 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

Chromium 1.67 0.68

Mercury 0.95 0.38

Silver 1.56 0.65

Zinc 5.55 2.32

Manganese 2.58 1.10

Oil and grease 76.0 45.6

TSS 155.8 74.1

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

Chromium 0.30 0.12

Mercury 0.17 0.07

Silver 0.28 0.12

Zinc 0.99 0.42

Manganese 0.46 0.20

Oil and grease 13.6 8.16

TSS 27.9 13.26

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

Chromium 62.9 25.7

Mercury 35.8 14.3

Silver 58.7 24.3

Zinc 208.8 87.2

Manganese 97.2 41.5

Oil and grease 2,860.0 1,716.0

TSS 5,863.0 2,789.0

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

Chromium 1,404.0 574.0

Mercury 798.0 319.0

Silver 1,308.0 543.0

Zinc 4,657.0 1,946.0

Manganese 2,169.0 925.0

Oil and grease 63,800.0 38,280.0

TSS 130,700.0 62,210.0

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

Chromium 86.2 35.3

Mercury 49.0 19.6

Silver 80.4 33.3

Zinc 286.2 119.6

Manganese 133.3 56.8

Oil and grease 3,920.0 2,350.0

TSS 8,036.0 3,822.0

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

Chromium 57.7 23.6

Mercury 32.8 13.1

Silver 53.7 22.3

Zinc 191.3 79.9

Manganese 89.1 38.0

Oil and grease 2,620.0 1,570.0

TSS 5,370.0 2,554.0

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

Chromium 13.8 5.65

Mercury 7.85 3.14

Silver 12.9 5.34

Zinc 45.8 19.2

Manganese 21.4 9.11

Oil and grease 628.0 377.0

TSS 1,287.0 612.0

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

Chromium 721.6 295.2

Mercury 410.0 164.0

Nickel 3,149.0 2,083.0

Silver 672.4 279.0

Zinc 2,394.4 1,000.4

Manganese 1,115.2 475.6

Oil and grease 32,800.0 19,680.0

TSS 67,240.0 31,980.0

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

Chromium 3.85 1.58

Cyanide 2.54 1.05

Mercury 2.19 0.88

Nickel 16.82 11.12

Silver 3.59 1.49

Zinc 12.79 5.34

Manganese 5.96 2.54

Oil and grease 175.20 105.12

TSS 359.16 170.82

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

Chromium 21.6 8.84

Mercury 12.3 4.91

Silver 20.2 8.35

Zinc 71.7 30.0

Manganese 33.4 14.3

Oil and grease 982.0 589.2

TSS 2,013.1 957.5

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

Chromium 23.0 9.40

Mercury 13.1 5.22

Silver 21.4 8.88

Zinc 76.2 31.80

Manganese 35.5 15.10

Oil and grease 1,044.0 627.00

TSS 2,140.0 1,018.00

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

Chromium 9.33 3.82

Mercury 5.30 2.12

Silver 8.69 3.61

Zinc 30.95 12.93

Manganese 14.42 6.15

Oil and grease 424.0 254.40

TSS 869.0 413.40

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.