Wisconsin Administrative Code › Department of Natural Resources › NR 200-299 - Environmental Protection Wisconsin Pollutant Discharge Elimination System › Chapter NR 273 - Nonferrous metals forming and metal powders › Subchapter IV - Precious Metals › Section NR 273.043 - 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 4-17
Precious Metals
Rolling Spent Emulsions
BAT Effluent Limitations
Maximum for any 1 day
Maximum for monthly average
Pollutant or pollutant property
mg/off-kg (pounds per million off-pounds) of
								  precious metals rolled with emulsions
Cadmium
0.026
0.012
Copper
0.147
0.077
Cyanide
0.023
0.010
Silver
0.032
0.013
Table 4-18
Precious Metals
Drawing Spent Emulsions
BAT Effluent Limitations
Maximum for any 1 day
Maximum for monthly average
Pollutant or pollutant property
mg/off-kg (pounds per million off-pounds) of
								  precious metals drawn with emulsions
Cadmium
0.016
0.007
Copper
0.091
0.048
Cyanide
0.014
0.006
Silver
0.020
0.008
Table 4-19
Precious Metals
Drawing Spent Soap Solutions
BAT Effluent Limitations
Maximum for any 1 day
Maximum for monthly average
Pollutant or pollutant property
mg/off-kg (pounds per million off-pounds) of
								  precious metals drawn with soap solutions
Cadmium
0.001
0.0005
Copper
0.006
0.003
Cyanide
0.0009
0.0004
Silver
0.002
0.0006
Table 4-20
Precious Metals
Metal Powder Production
Wet Atomization Wastewater
BAT Effluent Limitations
Maximum for any 1 day
Maximum for monthly average
Pollutant or pollutant property
mg/off-kg (pounds per million off-pounds) of
								  precious metals powder wet atomized
Cadmium
2.27
1.0
Copper
12.7
6.68
Cyanide
1.94
0.802
Silver
2.74
1.14
Table 4-21
Precious Metals
Heat Treatment Contact Cooling Water
BAT Effluent Limitations
Maximum for any 1 day
Maximum for monthly average
Pollutant or pollutant property
mg/off-kg (pounds per million off-pounds) of
								  extruded precious metals heat treated
Cadmium
0.142
0.063
Copper
0.793
0.417
Cyanide
0.121
0.050
Silver
0.171
0.071
Table 4-22
Precious Metals
Semi-Continuous or Continuous Contact Cooling Water
BAT Effluent Limitations
Maximum for any 1 day
Maximum for monthly average
Pollutant or pollutant property
mg/off-kg (pounds per million off-pounds) of
								  precious metals cast by the semi-continuous or continuous method
Cadmium
0.350
0.155
Copper
1.96
1.03
Cyanide
0.299
0.124
Silver
0.430
0.175
Table 4-23
Precious Metals
Direct Chill Casting Contact Cooling Water
BAT Effluent Limitations
Maximum for any 1 day
Maximum for monthly average
Pollutant or pollutant property
mg/off-kg (pounds per million off-pounds) of
								  precious metals cast by the direct chill method
Cadmium
0.3676
0.162
Copper
2.05
1.08
Cyanide
0.313
0.130
Silver
0.443
0.184
Table 4-24
Precious Metals
Shot Casting Contact Cooling Water
BAT Effluent Limitations
Maximum for any 1 day
Maximum for monthly average
Pollutant or pollutant property
mg/off-kg (pounds per million off-pounds) of
								  precious metals shot cast
Cadmium
0.125
0.055
Copper
0.698
0.367
Cyanide
0.107
0.044
Silver
0.151
0.063
Table 4-25
Precious Metals
Pressure Bonding Contact Cooling Water
BAT Effluent Limitations
Maximum for any 1 day
Maximum for monthly average
Pollutant or pollutant property
mg/off-kg (pounds per million off-pounds) of
								  precious metals base metal pressure bonded
Cadmium
0.0297
0.013
Copper
0.159
0.084
Cyanide
0.0247
0.010
Silver
0.0342
0.014
Table 4-26
Precious Metals
Surface Treatment Spent Baths
BAT Effluent Limitations
Maximum for any 1 day
Maximum for monthly average
Pollutant or pollutant property
mg/off-kg (pounds per million off-pounds) of
								  precious metals surface treated
Cadmium
0.033
0.015
Copper
0.183
0.097
Cyanide
0.028
0.012
Silver
0.040
0.017
Table 4-27
Precious Metals
Surface Treatment Rinse
BAT Effluent Limitations
Maximum for any 1 day
Maximum for monthly average
Pollutant or pollutant property
mg/off-kg (pounds per million off-pounds) of
								  precious metals surface treated
Cadmium
0.210
0.093
Copper
1.17
0.616
Cyanide
0.179
0.074
Silver
0.253
0.105
Table 4-28
Precious Metals
Alkaline Cleaning Spent Baths
BAT Effluent Limitations
Maximum for any 1 day
Maximum for monthly average
Pollutant or pollutant property
mg/off-kg (pounds per million off-pounds) of
								  precious metals alkaline cleaned
Cadmium
0.021
0.009
Copper
0.114
0.060
Cyanide
0.018
0.007
Silver
0.025
0.010
Table 4-29
Precious Metals
Alkaline Cleaning Rinse
BAT Effluent Limitations
Maximum for any 1 day
Maximum for monthly average
Pollutant or pollutant property
mg/off-kg (pounds per million off-pounds) of
								  precious metals alkaline cleaned
Cadmium
0.381
0.168
Copper
2.13
1.12
Cyanide
0.325
0.135
Silver
0.459
0.191
Table 4-30
Precious Metals
Alkaline Cleaning Prebonding Wastewater
BAT Effluent Limitations
Maximum for any 1 day
Maximum for monthly average
Pollutant or pollutant property
mg/off-kg (pounds per million off-pounds) of
								  precious metals and base metal cleaned prior to bonding
Cadmium
0.400
0.174
Copper
2.210
1.16
Cyanide
0.337
0.139
Silver
0.476
0.197
Table 4-31
Precious Metals
Tumbling or Burnishing Wastewater
BAT Effluent Limitations
Maximum for any 1 day
Maximum for monthly average
Pollutant or pollutant property
mg/off-kg (pounds per million off-pounds) of
								  precious metals tumbled or burnished
Cadmium
0.412
0.182
Copper
2.300
1.21
Cyanide
0.351
0.145
Silver
0.496
0.206
Table 4-32
Precious Metals
Sawing or Grinding Spent Emulsions
BAT Effluent Limitations
Maximum for any 1 day
Maximum for monthly average
Pollutant or pollutant property
mg/off-kg (pounds per million off-pounds) of
								  precious metals sawed or ground with emulsions
Cadmium
0.0327
0.014
Copper
0.178
0.094
Cyanide
0.0277
0.011
Silver
0.0381
0.016