Wisconsin Administrative Code › Department of Natural Resources › NR 200-299 - Environmental Protection Wisconsin Pollutant Discharge Elimination System › Chapter NR 274 - Nonferrous metals manufacturing › Subchapter XXVI - Secondary Precious Metals › Section NR 274.262 - Effluent limitations representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available

Current through June 24, 2024
Except as provided in
					 40 CFR 125.30
					 to
					 125.32, any
					 existing point source subject to this subchapter shall achieve the following
					 effluent limitations representing the degree of effluent reduction attainable
					 by application of BPT:
Table 26-1
Secondary Precious Metals Furnace Wet Air Pollution
					 Control
BPT Effluent Limitations
Maximum for any 1 day
Maximum for monthly average
Pollutant or pollutant property
mg/troy ounce of precious metals,
including silver, incinerated or
smelted
Copper
136.400
71.800
Cyanide
20.820
8.616
Zinc
104.800
43.800
Ammonia (as N)
9,571.000
4,207.000
Combined metals
21.54
Total suspended solids
2,944.000
1,400.000
pH
(1)
(1)
(1) Within the range of 7.5 to 10.0 at all times.
Table 26-2
Secondary Precious Metals Raw Material
					 Granulation
BPT Effluent Limitations
Maximum for any 1 day
Maximum for monthly average
Pollutant or pollutant property
mg/troy ounce of precious metal in the granulated
								  raw material
Copper
12.050
6.340
Cyanide
1.839
0.761
Zinc
9.256
3.867
Ammonia (as N)
845.100
371.500
Combined metals
1.902
Total suspended solids
259.900
123.600
pH
(1)
(1)
(1) Within the range of 7.5 to 10.0 at all times.
Table 26-3
Secondary Precious Metals Spent Plating
					 Solutions
BPT Effluent Limitations
Maximum for any 1 day
Maximum for monthly average
Pollutant or pollutant property
mg/liter of spent plating solution used as a raw
								  material
Copper
1.900
1.000
Cyanide
0.290
0.120
Zinc
1.460
0.610
Ammonia (as N)
133.300
58.600
Combined metals
0.300
Total suspended solids
41.000
19.500
pH
(1)
(1)
(1) Within the range of 7.5 to 10.0 at all times.
Table 26-4
Secondary Precious Metals Spent Cyanide Stripping
					 Solutions
BPT Effluent Limitations
Maximum for any 1 day
Maximum for monthly average
Pollutant or pollutant property
mg/troy ounce of gold produced by cyanide
								  stripping
Copper
7.030
3.700
Cyanide
1.073
0.444
Zinc
5.402
2.257
Ammonia (as N)
493.200
216.800
Combined metals
1.110
Total suspended solids
151.700
72.150
pH
(1)
(1)
(1) Within the range of 7.5 to 10.0 at all times.
Table 26-5
Secondary Precious Metals Refinery Wet Air Pollution
					 Control(1)
BPT Effluent Limitations
Maximum for any 1 day
Maximum for monthly average
Pollutant or pollutant property
mg/troy ounce of precious metals,
including silver, produced in the
refinery
Copper
39.900
21.000
Cyanide
6.090
2.520
Zinc
30.660
12.810
Ammonia (as N)
2,799.000
1,231.000
Combined metals
6.300
Total suspended solids
861.000
409.500
pH
(2)
(2)
(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.
(2) Within the range of 7.5 to 10.0 at all times.
Table 26-6
Secondary Precious Metals Gold Solvent Extraction
					 Raffinate and Wash Water
BPT Effluent Limitations
Maximum for any 1 day
Maximum for monthly average
Pollutant or pollutant property
mg/troy ounce of gold produced by solvent
								  extraction
Copper
1.197
0.630
Cyanide
0.183
0.076
Zinc
0.920
0.384
Ammonia (as N)
83.980
36.920
Combined metals
0.189
Total suspended solids
25.830
12.290
pH
(1)
(1)
(1) Within the range of 7.5 to 10.0 at all times.
Table 26-7
Secondary Precious Metals Gold Spent
					 Electrolyte
BPT Effluent Limitations
Maximum for any 1 day
Maximum for monthly average
Pollutant or pollutant property
mg/troy ounce of gold produced by
								  electrolysis
Copper
0.017
0.009
Cyanide
0.003
0.001
Zinc
0.103
0.005
Ammonia (as N)
0.160
0.510
Combined metals
0.003
Total suspended solids
0.357
0.170
pH
(1)
(1)
(1) Within the range of 7.5 to 10.0 at all times.
Table 26-8
Secondary Precious Metals Gold Precipitation and
					 Filtration
BPT Effluent Limitations
Maximum for any 1 day
Maximum for monthly average
Pollutant or pollutant property
mg/troy ounce of gold precipitated
Copper
8.360
4.400
Cyanide
1.276
0.528
Zinc
6.424
2.684
Ammonia (as N)
586.500
257.800
Combined metals
1.320
Total suspended solids
180.400
85.800
pH
(1)
(1)
(1) Within the range of 7.5 to 10.0 at all times.
Table 26-9
Secondary Precious Metals Platinum Precipitation and
					 Filtration
BPT Effluent Limitations
Maximum for any 1 day
Maximum for monthly average
Pollutant or pollutant property
mg/troy ounce of platinum precipitated
Copper
9.880
5.200
Cyanide
1.508
0.624
Zinc
7.592
3.172
Ammonia (as N)
693.200
304.700
Combined metals
1.560
Total suspended solids
213.200
101.400
pH
(1)
(1)
(1) Within the range of 7.5 to 10.0 at all times.
Table 26-10
Secondary Precious Metals Palladium Precipitation
					 and Filtration
BPT E
ffluent Limitations
Maximum for any 1 day
Maximum for monthly average
Pollutant or pollutant property
mg/troy ounce of palladium precipitated
Copper
11.400
6.000
Cyanide
1.740
0.720
Zinc
8.760
3.660
Ammonia (as N)
799.800
351.600
Combined metals
1.800
Total suspended solids
246.000
117.000
pH
(1)
(1)
(1) Within the range of 7.5 to 10.0 at all times.
Table 26-11
Secondary Precious Metals Other Platinum Group
					 Metals Precipitation and Filtration
BPT Effluent Limitations
Maximum for any 1 day
Maximum for monthly average
Pollutant or pollutant property
mg/troy ounce of other platinum group metals
								  precipitated
Copper
9.880
5.200
Cyanide
1.508
0.624
Zinc
7.592
3.172
Ammonia (as N)
693.200
304.700
Combined metals
1.560
Total suspended solids
213.200
101.400
pH
(1)
(1)
(1) Within the range of 7.5 to 10.0 at all times.
Table 26-12
Secondary Precious Metals Spent Solution for PGC
					 Salt Production
BPT Effluent Limitations
Maximum for any 1 day
Maximum for monthly average
Pollutant or pollutant property
mg/troy ounce of gold contained in PGC
								  product
Copper
1.710
0.900
Cyanide
0.261
0.108
Zinc
1.314
0.549
Ammonia (as N)
120.000
52.740
Combined metals
0.270
Total suspended solids
36.900
17.550
pH
(1)
(1)
(1) Within the range of 7.5 to 10.0 at all times.
Table 26-13
Secondary Precious Metals Equipment and Floor
					 Wash
BPT Effluent Limitations
Maximum for any 1 day
Maximum for monthly average
Pollutant or pollutant property
mg/troy ounce of precious metals, including
								  silver, produced in the refinery
Copper
0.000
0.000
Cyanide
0.000
0.000
Zinc
0.000
0.000
Ammonia (as N)
0.000
0.000
Combined metals
0.000
0.000
Total suspended solids
0.000
0.000
pH
(1)
(1)
(1) Within the range of 7.5 to 10.0 at all times.
Table 26-14
Secondary Precious Metals Preliminary
					 Treatment
BPT Effluent Limitations
Maximum for any 1 day
Maximum for monthly average
Pollutant or pollutant property
mg/troy ounce of precious metals, metals produced
								  through this operation
Copper
95.000
50.000
Cyanide
14.500
6.000
Zinc
73.000
30.500
Ammonia (as N)
6,665.000
2,930.000
Combined metals
15.000
Total suspended solids
2,050.000
975.000
pH
(1)
(1)
(1) Within the range of 7.5 to 10.0 at all times.