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Code of Federal Regulations (Last Updated: July 5, 2024) |
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Title 40 - Protection of Environment |
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Chapter I - Environmental Protection Agency |
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SubChapter N - Effluent Guidelines and Standards |
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Part 421 - Nonferrous Metals Manufacturing Point Source Category |
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Subpart X - Secondary Precious Metals Subcategory |
§ 421.266 - Pretreatment standards for new sources.
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§ 421.266 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 secondary precious metals process wastewater introduced into a POTW shall not exceed the following values:
(a) Furnace wet air pollution control.
PSNS 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 (b) Raw material granulation.
PSNS 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 Ammonia 85.310 37.500 (c) Spent plating solutions.
PSNS 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 materail 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 (d) Spent cyanide stripping solutions.
PSNS 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 (e) Refinery Wet Air Pollution Control.[1]
PSNS 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 (f) Gold solvent extraction raffinate and wash water.
PSNS 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 (g) Gold spent electrolyte.
PSNS 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 0.011 0.005 Cyanide (total) 0.002 0.001 Zinc 0.009 0.004 Combined metals 0.300 Ammonia (as N) 1.160 0.510 (h) Gold precipitation and filtration.
PSNS 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 (i) Platinum precipitation and filtration.
PSNS 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 1.560 Ammonia (as N) 693.200 304.700 (j) Palladium precipitation and filtration.
PSNS 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 7.680 3.660 Cyanide (Total) 1.200 0.480 Zinc 6.120 2.520 Combined Metals 1.800 Ammonia (as N) 799.800 351.600 (k) Other platinum group metals precipitation and filtration.
PSNS 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 (l) Spent solution from PGC salt production.
PSNS 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 (m) Equipment and floor wash.
PSNS 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 (n) Preliminary Treatmenttreatment.
PSNS for the Secondary Precious Metals Subcategory
Pollutant or pollutant property Maximum for any 1 day Maximum for monthly averge 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 [50 FR 38365, Sept. 20, 1985, as amended at 55 FR 31711, Aug. 3, 1990]