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 273.042 - 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 4-1
Precious Metals
Rolling Spent Emulsions
BPT 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
Oil and grease
1.54
0.925
Total suspended solids
3.16
1.51
pH
(1)
(1)
(1) Within the range of 7.5 to 10.0 at all times
Table 4-2
Precious Metals
Drawing Spent Emulsions
BPT 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
Oil and grease
0.950
0.570
Total suspended solids
1.95
0.926
pH
(1)
(1)
(1) Within the range of 7.5 to 10.0 at all times
Table 4-3
Precious Metals
Drawing Spent Soap Solutions
BPT 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
0.001
0.0006
Oil and grease
0.063
0.038
Total suspended solids
0.128
0.061
pH
(1)
(1)
(1) Within the range of 7.5 to 10.0 at all times
Table 4-4
Precious Metals
Metal Powder Production
Wet Atomization Wastewater
BPT 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
1.00
Copper
12.7
6.70
Cyanide
1.94
0.802
Silver
2.70
1.14
Oil and grease
134
80.2
Total suspended solids
274
130
pH
(1)
(1)
(1) Within the range of 7.5 to 10.0 at all times
Table 4-5
Precious Metals
Heat Treatment Contact Cooling Water
BPT 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
1.42
0.626
Copper
7.93
4.17
Cyanide
1.21
0.501
Silver
1.71
0.709
Oil and grease
83.4
50.1
Total suspended solids
171
81.3
pH
(1)
(1)
(1) Within the range of 7.5 to 10.0 at all times
Table 4-6
Precious Metals
Semi-Continuous or Continuous Contact Cooling Water
BPT 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
3.50
1.55
Copper
19.6
10.3
Cyanide
2.99
1.24
Silver
4.23
1.75
Oil and grease
206
124
Total suspended solids
423
209
pH
(1)
(1)
(1) Within the range of 7.5 to 10.0 at all times
Table 4-7
Precious Metals
Direct Chill Casting Contact Cooling Water
BPT 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
3.67
1.62
Copper
20.5
10.8
Cyanide
3.13
1.30x
Silver
4.43
1.84x
Oil and grease
216
130
Total suspended solids
443
211
pH
(1)
(1)
(1) Within the range of 7.5 to 10.0 at all times
Table 4-8
Precious Metals
Shot Casting Contact Cooling Water
BPT 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
1.25
0.551
Copper
6.98
3.67
Cyanide
1.07
0.441
Silver
1.51
0.624
Oil and grease
73.4
44.1
Total suspended solids
151
71.6
pH
(1)
(1)
(1) Within the range of 7.5 to 10.0 at all times
Table 4-9
Precious Metals
Pressure Bonding Contact Cooling Water
BPT 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 metal base metal pressure bonded
Cadmium
0.029
0.013
Copper
0.159
0.084
Cyanide
0.024
0.010
Silver
0.034
0.014
Oil and grease
1.67
1.00
Total suspended solids
3.43
1.63
pH
(1)
(1)
(1) Within the range of 7.5 to 10.0 at all times
Table 4-10
Precious Metals
Surface Treatment Spent Baths
BPT 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
Oil and grease
1.93
1.16
Total suspended solids
3.95
1.88
pH
(1)
(1)
(1) Within the range of 7.5 to 10.0 at all times
Table 4-11
Precious Metals
Surface Treatment Rinse
BPT 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
2.10
0.924
Copper
11.7
5.16
Cyanide
1.79
0.739
Silver
2.53
1.05
Oil and grease
123
73.9
Total suspended solids
253
120
pH
(1)
(1)
(1) Within the range of 7.5 to 10.0 at all times
Table 4-12
Precious Metals
Alkaline Cleaning Spent Baths
BPT 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
Oil and grease
1.20
0.720
Total suspended solids
2.46
1.170
pH
(1)
(1)
(1) Within the range of 7.5 to 10.0 at all times
Table 4-13
Precious Metals
Alkaline Cleaning Rinse
BPT 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
3.81
1.68
Copper
21.3
11.2
Cyanide
3.25
1.35
Silver
4.59
1.91
Oil and grease
224
135
Total suspended solids
459
219
pH
(1)
(1)
(1) Within the range of 7.5 to 10.0 at all times
Table 4-14
Precious Metals
Alkaline Cleaning Prebonding Wastewater
BPT 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
3.95
1.74
Copper
22.1
11.6
Cyanide
3.37
1.39
Silver
4.76
1.97
Oil and grease
232
139
Total suspended solids
476
226
pH
(1)
(1)
(1) Within the range of 7.5 to 10.0 at all times
Table 4-15
Precious Metals
Tumbling or Burnishing Wastewater
BPT 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
4.12
1.82
Copper
23.0
12.1
Cyanide
3.51
1.45
Silver
4.96
2.06
Oil and grease
242
145
Total suspended solids
496
236
pH
(1)
(1)
(1) Within the range of 7.5 to 10.0 at all times
Table 4-16
Precious Metals
Sawing or Grinding Spent Emulsions
BPT 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
0.032
0.014
Copper
0.178
0.094
Cyanide
0.027
0.011
Silver
0.039
0.016
Oil and grease
1.87
1.12
Total suspended solids
3.83
1.82
pH
(1)
(1)
(1) Within the range of 7.5 to 10.0 at all
					 times