View all text of Subpart AC [§ 421.310 - § 421.317]
§ 421.315 - Pretreatment standards for existing sources.
Except as provided in 40 CFR 403.7, any existing source subject to this subpart which introduces polutants 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 secondary tungsten and cobalt process wastewater introduced into a POTW shall not exceed the following values:
(a) Tungsten detergent wash and rinse.
PSES for the Secondary Tungsten and Cobalt Subcategory
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average | mg/kg (pounds per million pounds) of tungsten scrap washed | Copper | 0.250 | 0.119 | Nickel | 0.107 | 0.072 | Ammonia (as N) | 25.990 | 11.430 | Cobalt | 0.538 | 0.236 | Tungsten | 0.679 | 0.302 |
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(b) Tungsten leaching acid.
PSES for the Secondary Tungsten and Cobalt Subcategory
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average | mg/kg (pounds per million pounds) of tungsten produced | Copper | 3.291 | 1.569 | Nickel | 1.414 | 0.951 | Ammonia (as N) | 342.700 | 150.700 | Cobalt | 7.096 | 3.111 | Tungsten | 8.947 | 3.985 |
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(c) Tungsten post-leaching wash and rinse.
PSES for the Secondary Tungsten and Cobalt Subcategory
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average | mg/kg (pounds per million pounds) of tungsten produced | Copper | 6.583 | 3.137 | Nickel | 2.829 | 1.903 | Ammonia (as N) | 685.600 | 301.400 | Cobalt | 14.194 | 6.223 | Tungsten | 17.900 | 7.972 |
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(d) Synthetic scheelite filtrate.
PSES for the Secondary Tungsten and Cobalt Subcategory
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average | mg/kg (pounds per million pounds) of synthetic scheelite produced | Copper | 21.330 | 10.170 | Nickel | 9.164 | 6.165 | Ammonia (as N) | 2,221.000 | 976.300 | Cobalt | 45.984 | 20.160 | Tungsten | 57.980 | 25.820 |
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(e) Tungsten carbide leaching wet air pollution control.
PSES for the Secondary Tungsten and Cobalt Subcategory
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average | mg/kg (pounds per million pounds) of tungsten carbide scrap | Copper | 2.241 | 1.068 | Nickel | 0.963 | 0.648 | Ammonia (as N) | 233.400 | 102.600 | Cobalt | 4.833 | 2.119 | Tungsten | 6.093 | 2.714 |
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(f) Tungsten carbide wash water.
PSES for the Secondary Tungsten and Cobalt Subcategory
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average | mg/kg (pounds per million pounds) of tungsten carbide produced | Copper | 10.670 | 5.083 | Nickel | 4.583 | 3.083 | Ammonia (as N) | 1,111.000 | 488.300 | Cobalt | 22.999 | 10.083 | Tungsten | 29.000 | 12.920 |
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(g) Cobalt sludge leaching wet air pollution control.
PSES for the Secondary Tungsten 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 from cobalt sludge | Copper | 45.800 | 21.830 | Nickel | 19.680 | 13.240 | Ammonia (as N) | 4,770.000 | 2,097.000 | Cobalt | 98.756 | 43.295 | Tungsten | 124.500 | 55.460 |
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(h) Crystallization decant.
PSES for the Secondary Tungsten 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 | 53.310 | 25.410 | Nickel | 22.910 | 15.410 | Ammonia (as N) | 5,552.000 | 2,441.000 | Cobalt | 114.954 | 50.397 | Tungsten | 144.9 | 64.56 |
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(i) Acid wash decant.
PSES for the Secondary Tungsten 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 | 24.400 | 11.630 | Nickel | 10.490 | 7.053 | Ammonia (as N) | 2,541.000 | 1,117.000 | Cobalt | 52.611 | 23.065 | Tungsten | 66.34 | 29.55 |
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(j) Cobalt hydroxide filtrate.
PSES for the Secondary Tungsten 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 | 72.510 | 34.560 | Nickel | 31.160 | 20.960 | Ammonia (as N) | 7,551.000 | 3,320.000 | Cobalt | 156.346 | 68.543 | Tungsten | 197.1 | 87.8 |
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(k) Cobalt hydroxide filter cake wash.
PSES for the Secondary Tungsten 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 | 139.600 | 66.510 | Nickel | 59.970 | 40.340 | Ammonia (as N) | 14,530.000 | 6,389.000 | Cobalt | 300.094 | 131.932 | Tungsten | 379.400 | 169.000 |
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