CFR / Title 40 / Part 421 / Sec. 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------------------------------------------------------------------------

Maximum for

Pollutant or pollutant property Maximum for monthly

any 1 day average------------------------------------------------------------------------

mg/troy ounce of

precious metals,

including silver,

incinerated or smelted

--------------Copper........................................ 5.760 2.745Cyanide (total)............................... 0.900 0.360Zinc.......................................... 4.590 1.890Combined metals............................... 1.350 ...........Ammonia (as N)................................ 599.900 263.700------------------------------------------------------------------------

(b) Raw material granulation.

PSES for the Secondary Precious Metals Subcategory------------------------------------------------------------------------

Maximum for

Pollutant or pollutant property Maximum for monthly

any 1 day average------------------------------------------------------------------------

mg/troy ounce of

precious metals in the

granulated raw material

--------------Copper........................................ 0.819 0.390Cyanide (total)............................... 0.128 0.051Zinc.......................................... 0.653 0.269Combined metals............................... 0.192 ...........Ammonia (as N)................................ 85.310 37.500------------------------------------------------------------------------

(c) Spent plating solutions.

PSES for the Secondary Precious Metals Subcategory------------------------------------------------------------------------

Maximum for

Pollutant or pollutant property Maximum for monthly

any 1 day average------------------------------------------------------------------------

mg/liter of spent

plating solution used as

a raw material

--------------Copper........................................ 1.280 0.610Cyanide (total)............................... 0.200 0.080Zinc.......................................... 1.020 0.420Combined metals............................... 0.300 ...........Ammonia (as N)................................ 133.300 58.600------------------------------------------------------------------------

(d) Spent Cyanide stripping solutions.

PSES for the Secondary Precious Metals Subcategory------------------------------------------------------------------------

Maximum for

Pollutant or pollutant property Maximum for monthly

any 1 day average------------------------------------------------------------------------

mg/troy ounce of gold

produced by cyanide

stripping

--------------Copper........................................ 4.736 2.257Cyanide (total)............................... 0.740 0.296Zinc.......................................... 3.774 1.554Combined metals............................... 1.110 ...........Ammonia (as N)................................ 493.200 216.800------------------------------------------------------------------------

(e) Refinery wet air pollution control.\1\---------------------------------------------------------------------------

\1\ 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.

PSES for the Secondary Precious Metals Subcategory------------------------------------------------------------------------

Maximum for

Pollutant or pollutant property Maximum for monthly

any 1 day average------------------------------------------------------------------------

mg/troy ounce of

precious metals,

including silver,

produced in refinery

(f) Gold solvent extraction raffinate and wash water.

PSES for the Secondary Precious Metals Subcategory------------------------------------------------------------------------

Maximum for

Pollutant or pollutant property Maximum for monthly

any 1 day average------------------------------------------------------------------------

mg/troy ounce of gold

produced by solvent

extraction

--------------Copper........................................ 0.806 0.384Cyanide (total)............................... 0.126 0.050Zinc.......................................... 0.643 0.265Combined metals............................... 0.189 ...........Ammonia (as N)................................ 83.980 36.920------------------------------------------------------------------------

(g) Gold spent electrolyte.

PSES for the Secondary Precious Metals Subcategory------------------------------------------------------------------------

Maximum for

Pollutant or pollutant property Maximum for monthly

any 1 day average------------------------------------------------------------------------

mg/troy ounce of gold

produced by electrolysis

--------------Copper........................................ 0.011 0.005Cyanide (total)............................... 0.002 0.001Zinc.......................................... 0.009 0.004Combined metals............................... 0.003 ...........Ammonia (as N)................................ 1.160 0.510------------------------------------------------------------------------

(h) Gold precipitation and filtration.

PSES for the Secondary Precious Metals Subcategory------------------------------------------------------------------------

Maximum for

Pollutant or pollutant property Maximum for monthly

any 1 day average------------------------------------------------------------------------

mg/troy ounce of gold

precipitated

--------------Copper........................................ 5.632 2.684Cyanide (total)............................... 0.880 0.352Zinc.......................................... 4.488 1.848Combined metals............................... 1.320 ...........Ammonia (as N)................................ 586.500 257.800------------------------------------------------------------------------

(i) Platinum precipitation and filtration.

PSES for the Secondary Precious Metals Subcategory------------------------------------------------------------------------

Maximum for

Pollutant or pollutant property Maximum for monthly

any 1 day average------------------------------------------------------------------------

mg/troy ounce of

platinum precipitated

--------------Copper........................................ 6.656 3.172Cyanide (total)............................... 1.040 0.416Zinc.......................................... 5.304 2.184Combined metals............................... 1.560 ...........Ammonia (as N)................................ 693.200 304.700------------------------------------------------------------------------

(j) Palladium precipitation and filtration.

PSES for the Secondary Precious Metals Subcategory------------------------------------------------------------------------

Maximum for

Pollutant or pollutant property Maximum for monthly

any 1 day average------------------------------------------------------------------------

mg/troy ounce of

palladium precipitated

--------------Copper........................................ 7.680 3.660Cyanide (total)............................... 1.200 0.480Zinc.......................................... 6.120 2.520Combined 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------------------------------------------------------------------------

Maximum for

Pollutant or pollutant property Maximum for monthly

any 1 day average------------------------------------------------------------------------

mg/troy ounce of other

platinum group metals

precipitated

(l) Spent solution from PGC salt production.

PSES for the Secondary Precious Metals Subcategory------------------------------------------------------------------------

Maximum for

Pollutant or pollutant property Maximum for monthly

any 1 day average------------------------------------------------------------------------

mg/troy ounce of gold

contained in PGC product

--------------Copper........................................ 1.152 0.549Cyanide (total)............................... 0.180 0.072Zinc.......................................... 0.918 0.378Combined metals............................... 0.270 ...........Ammonia (as N)................................ 120.000 52.740------------------------------------------------------------------------

(m) Equipment and floor wash.

PSES for the Secondary Precious Metals Subcategory------------------------------------------------------------------------

Maximum for

Pollutant or pollutant property Maximum for monthly

any 1 day average------------------------------------------------------------------------

mg/troy ounce of

precious metals,

including silver,

produced in refinery

--------------Copper........................................ 0.000 0.000Cyanide (total)............................... 0.000 0.000Zinc.......................................... 0.000 0.000Combined metals............................... 0.000 ...........Ammonia (as N)................................ 0.000 0.000------------------------------------------------------------------------

(n) Preliminary treatment.

PSES for the Secondary Precious Metals Subcategory------------------------------------------------------------------------

Maximum for

Pollutant or pollutant property Maximum for monthly

any 1 day average------------------------------------------------------------------------

Mg/troy ounce of total

precious metals produced

through this operation

-------------------------Copper........................................ 64.000 30.500Cyanide (Total)............................... 10.000 4.000Zinc.......................................... 51.000 21.000Combined Metals............................... 15.000 ...........Ammonia (as N)................................ 6665.000 2930.000------------------------------------------------------------------------ [50 FR 38365, Sept. 20, 1985, as amended at 55 FR 31710, 31711, Aug. 3, 1990]