40 CFR 421.265: Pretreatment standards for existing sources.

Except as provided in 40 CFR 403.7 and 403.13, any existing 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 existing sources. The mass of wastewater pollutants in secondary precious metals process wastewater introduced into a POTW must not exceed the following values:

(a) Furnace wet air pollution control.

PSES 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.

PSES 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 (as N) 85.310 37.500

(c) Spent plating solutions.

PSES 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

Combined metals 0.300

Ammonia (as N) 133.300 58.600

(d) Spent Cyanide stripping solutions.

PSES 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

PSES 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.

PSES 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.

PSES 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 0.003

Ammonia (as N) 1.160 0.510

(h) Gold precipitation and filtration.

PSES 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.

PSES 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.

PSES 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 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.

PSES 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.

PSES 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.

PSES 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 Treatment.

PSES 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