View all text of Subpart X [§ 421.260 - § 421.267]
§ 421.263 - 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) Furnace wet air pollution control.
BAT Limitations for the Secondary Precious Metals Subcategory
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average | mg/troy ounce of precious metals, including silver, incinerated or smelted | Copper | 5.760 | 2.745 | Cyanide (total) | 0.900 | 0.360 | Zinc | 4.590 | 1.890 | Combined metals | 1.350 | Ammonia (as N) | 599.900 | 263.700 |
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(b) Raw material granulation.
BAT Limitations for the Secondary Precious Metals Subcategory
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average | mg/troy ounce of precious metals in the granulated raw material | Copper | 0.819 | 0.390 | Cyanide (total) | 0.128 | 0.051 | Zinc | 0.653 | 0.269 | Combined metals | 0.192 | Palladium | 0.064 | Platinum | 0.064 | Ammonia (as N) | 85.310 | 37.500 |
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(c) Spent plating solutions.
BAT Limitations for the Secondary Precious Metals Subcategory
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average | mg/liter of spent plating solution used as a raw material | Copper | 1.280 | 0.610 | Cyanide (total) | 0.200 | 0.080 | Zinc | 1.020 | 0.420 | Gold | Combined metals | 0.300 | Ammonia (as N) | 133.300 | 58.600 |
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(d) Spent cyanide stripping solutions.
BAT Limitations for the Secondary Precious Metals Subcategory
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average | mg/troy ounce of gold produced by cyanide stripping | Copper | 4.736 | 2.257 | Cyanide (total) | 0.740 | 0.296 | Zinc | 3.774 | 1.554 | Combined metals | 1.110 | Ammonia (as N) | 493.200 | 216.800 |
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(e) Refinery wet air pollution control
2.
2 This allowance applies to either acid or alkaline wet air pollution control scrubbers. If both acid and alkaline wet air pollution control scrubbers are present in a particular facility the same allowance applies to each.
BAT Limitations for the Secondary Precious Metals Subcategory
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average | mg/troy ounce of precious metals, including silver, produced in refinery | Copper | 1.280 | 0.610 | Cyanide (total) | 0.200 | 0.080 | Zinc | 1.020 | 0.420 | Combined metals | 0.300 | Ammonia (as N) | 133.300 | 58.600 |
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(f) Gold solvent extraction raffinate and wash water.
BAT Limitations for the Secondary Precious Metals Subcategory
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average | mg/troy ounce of gold produced by solvent extraction | Copper | 0.806 | 0.384 | Cyanide (total) | 0.126 | 0.050 | Zinc | 0.643 | 0.265 | Combined metals | 0.189 | Ammonia (as N) | 83.980 | 36.920 |
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(g) Gold spent electrolyte.
BAT Limitations for the Secondary Precious Metals Subcategory
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average | mg/troy ounce of gold produced by electrolysis | Copper | 0.0111 | 0.0053 | Cyanide (total) | 0.0017 | 0.0007 | Zinc | 0.0089 | 0.0037 | Combined metals | 0.0030 | Ammonia (as N) | 1.1600 | 0.5100 |
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(h) Gold precipitation and filtration.
BAT Limitations for the Secondary Precious Metals Subcategory
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average | mg/troy ounce of gold precipitated | Copper | 5.632 | 2.684 | Cyanide (total) | 0.880 | 0.352 | Zinc | 4.488 | 1.848 | Combined metals | 1.320 | Ammonia (as N) | 586.500 | 257.800 |
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(i) Platinum precipitation and filtration.
BAT Limitations for the Secondary Precious Metals Subcategory
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average | mg/troy ounce of platinum precipitated | Copper | 6.656 | 3.172 | Cyanide (total) | 1.040 | 0.416 | Zinc | 5.304 | 2.184 | Combined metals | 0.560 | Ammonia (as N) | 693.200 | 304.700 |
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(j) Palladium precipitation and filtration.
BAT Limitations for the Secondary Precious Metals Subcategory
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average | mg/troy ounce of palladium precipitated | Copper | 7.680 | 3.660 | Cyanide (total) | 1.200 | .480 | Zinc | 6.120 | 2.520 | Combined metals | 1.800 | Ammonia (as N) | 799.800 | 351.600 |
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(k) Other platinum group metals precipitation and filtration.
BAT Limitations for the Secondary Precious Metals Subcategory
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average | mg/troy ounce of other platinum group metals precipitated | Copper | 6.656 | 3.172 | Cyanide (total) | 1.040 | 0.416 | Zinc | 5.304 | 2.184 | Combined metals | 1.560 | Ammonia (as N) | 693.200 | 304.700 |
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(l) Spent solutions from PGC salt production.
BAT Limitations for the Secondary Precious Metals Subcategory
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average | mg/troy ounce of gold contained in PGC product | Copper | 1.152 | 0.549 | Cyanide (total) | 0.180 | 0.072 | Zinc | 0.918 | 0.378 | Combined metals | 0.270 | Ammonia (as N) | 120.000 | 52.740 |
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(m) Equipment and floor wash.
BAT Limitations for the Secondary Precious Metals Subcategory
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average | mg/troy ounce of precious metals, including silver, produced in refinery | Copper | 0.000 | 0.000 | Cyanide (total) | 0.000 | 0.000 | Zinc | 0.000 | 0.000 | Combined metals | 0.000 | Ammonia (as N) | 0.000 | 0.000 |
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(n) Preliminary treatment.
BAT Limitations for the Secondary Precious Metals Subcategory
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average | Mg/troy ounce of total precious metals produced through this operation | Copper | 64.000 | 30.500 | Cyanide (Total) | 10.000 | 4.000 | Zinc | 51.000 | 21.000 | Combined metals | 15.000 | Ammonia (as N) | 6665.000 | 2930.000 |
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