Wisconsin Administrative Code › Department of Natural Resources › NR 200-299 - Environmental Protection Wisconsin Pollutant Discharge Elimination System › Chapter NR 274 - Nonferrous metals manufacturing › Subchapter XII - Secondary Silver › Section NR 274.123 - Effluent limitations representing the degree of effluent reduction attainable by the application of the best available technology economically achievable

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 BAT:
Table 12-12
Secondary Silver Film Stripping
BAT Effluent Limitations
Maximum for any 1 day
Maximum for monthly average
Pollutant or pollutant property
mg/troy ounce of silver from film
								  stripping
Copper
64.450
30.720
Zinc
51.360
21.150
Ammonia (as N)
6,712.000
2,951.000
Table 12-13
Secondary Silver Film Stripping Wet Air Pollution Control
					 and Precipitation and Filtration of Film Stripping Solutions Wet Air Pollution
					 Control
BAT Effluent Limitations
Maximum for any 1 day
Maximum for monthly average
Pollutant or pollutant property
mg/troy ounce of silver from precipitation and
								  filtration of film stripping solutions
Copper
1.242
0.592
Zinc
0.990
0.408
Ammonia (as N)
129.300
56.840
Table 12-14
Secondary Silver Precipitation and Filtration of Film
					 Stripping Solutions
BAT Effluent Limitations
Maximum for any 1 day
Maximum for monthly average
Pollutant or pollutant property
mg/troy ounce of silver precipitated
Copper
73.690
35.120
Zinc
58.720
24.180
Ammonia (as N)
7,674.000
3,374.000
Table 12-15
Secondary Silver Precipitation and Filtration of
					 Photographic Solutions
BAT Effluent Limitations
Maximum for any 1 day
Maximum for monthly average
Pollutant or pollutant property
mg/troy ounce of silver precipitated
Copper
34.048
16.226
Zinc
27.132
11.172
Ammonia (as N)
3,545.000
1,559.000
Table 12-16
Secondary Silver Precipitation and Filtration of
					 Photographic Solutions Wet Air Pollution Control
BAT Effluent Limitations
Maximum for any 1 day
Maximum for monthly average
Pollutant or pollutant property
mg/troy ounce of silver from precipitation and
								  filtration of photographic solutions
Copper
15.540
7.706
Zinc
12.380
5.099
Ammonia (as N)
1,618.000
711.400
Table 12-17
Secondary Silver Electrolytic Refining
BAT Effluent Limitations
Maximum for any 1 day
Maximum for monthly average
Pollutant or pollutant property
mg/troy ounce of silver from electrolytic
								  refining
Copper
0.973
0.464
Zinc
0.775
0.319
Ammonia (as N)
101.300
44.540
Table 12-18
Secondary Silver Furnace Wet Air Pollution Control
BAT Effluent Limitations
Maximum for any 1 day
Maximum for monthly average
Pollutant or pollutant property
mg/troy ounce of silver roasted, smelted, or
								  dried
Copper
0.000
0.000
Zinc
0.000
0.000
Ammonia (as N)
0.000
0.000
Table 12-19
Secondary Silver Leaching
BAT Effluent Limitations
Maximum for any 1 day
Maximum for monthly average
Pollutant or pollutant property
mg/troy ounce of silver produced from
								  leaching
Copper
0.110
0.053
Zinc
0.088
0.036
Ammonia (as N)
11.470
5.040
Table 12-20
Secondary Silver Leaching Wet Air Pollution Control and
					 Precipitation of Nonphotographic Solutions Wet Air Pollution Control
BAT Effluent Limitations
Maximum for any 1 day
Maximum for monthly average
Pollutant or pollutant property
mg/troy ounce of silver produced from leaching or
								  precipitated
Copper
5.671
2.703
Zinc
4.519
1.861
Ammonia (as N)
590.500
259.600
Table 12-21
Secondary Silver Precipitation and Filtration of
					 Nonphotographic Solutions
BAT Effluent Limitations
Maximum for any Maximum for 1 day monthly
								  average
Pollutant or pollutant property
mg/troy ounce of silver precipitated
Copper
3.930
1.873
Zinc
3.132
1.290
Ammonia (as N)
409.300
179.900
Table 12-22
Secondary Silver Floor and Equipment Washdown
BAT Effluent Limitations
Maximum for any 1 day
Maximum for monthly average
Pollutant or pollutant property
mg/troy ounce of silver production
Copper
0.000
0.000
Zinc
0.000
0.000
Ammonia (as N)
0.000
0.000