Wisconsin Administrative Code › Department of Natural Resources › NR 200-299 - Environmental Protection Wisconsin Pollutant Discharge Elimination System › Chapter NR 274 - Nonferrous metals manufacturing › Subchapter XXV - Primary Precious Metals and Mercury › Section NR 274.252 - 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 25-1
Primary Precious Metals and Mercury Smelter Wet Air
					 Pollution Control
BPT Effluent Limitations
Maximum for any 1 day
Maximum for monthly average
Pollutant or pollutant property
mg/troy ounce of gold and silver smelted
Lead
0.546
0.260
Mercury
0.325
0.130
Silver
0.533
0.221
Zinc
1.898
0.793
Gold
0.130
Oil and grease
26.000
15.600
Total suspended solids
53.300
25.350
pH
(1)
(1)
(1) Within the range of 7.5 to 10.0 at all times
Table 25-2
Primary Precious Metals and Mercury Silver Chloride
					 Reduction Spent Solution
BPT Effluent Limitations
Maximum for any 1 day
Maximum for monthly average
Pollutant or pollutant property
mg/troy ounce of silver reduced in
								  solution
Lead
0.168
0.080
Mercury
0.100
0.040
Silver
0.164
0.068
Zinc
0.584
0.244
Gold
0.040
Oil and grease
8.000
4.800
Total suspended solids
16.400
7.800
pH
(1)
(1)
(1) Within the range of 7.5 to 10.0 at all times
Table 25-3
Primary Precious Metals and Mercury Electrolytic Cells Wet
					 Air Pollution Control
BPT Effluent Limitations
Maximum for any 1 day
Maximum for monthly average
Pollutant or pollutant property
mg/troy ounce of gold refined
								  electrolytically
Lead
83.160
39.600
Mercury
49.500
19.800
Silver
81.180
33.660
Zinc
289.100
120.800
Gold
19.800
Oil and grease
3,960.000
2,376.000
Total suspended solids
8,118.000
3,861.000
pH
(1)
(1)
(1) Within the range of 7.5 to 10.0 at all times
Table 25-4
Primary Precious Metals and Mercury Electrolyte
					 Preparation Wet Air Pollution Control
BPT Effluent Limitations
Maximum for any 1 day
Maximum for monthly average
Pollutant or pollutant property
mg/troy ounce of silver in the produced
								  electrolyte
Lead
0.021
0.010
Mercury
0.013
0.005
Silver
0.021
0.009
Zinc
0.073
0.031
Gold
0.005
Oil and grease
1.000
0.600
Total suspended solids
2.050
0.975
pH
(1)
(1)
(1) Within the range of 7.5 to 10.0 at all times.
Table 25-5
Primary Precious Metals and Mercury Calciner Wet Air
					 Pollution Control
BPT Effluent Limitations
Maximum for any 1 day
Maximum for monthly average
Pollutant or pollutant property
mg/kg (pounds per million pounds) of mercury
								  condensed
Lead
78.200
37.240
Mercury
46.550
18.620
Silver
76.340
31.650
Zinc
271.900
113.600
Gold
18.600
Oil and grease
3,724.000
2,234.000
Total suspended solids
7,634.000
3,631.000
pH
(1)
(1)
(1) Within the range of 7.5 to 10.0 at all times.
Table 25-6
Primary Precious Metals and Mercury Calcine Quench
					 Water
BPT Effluent Limitations
Maximum for any 1 day
Maximum for monthly average
Pollutant or pollutant property
mg/kg (pounds per million pounds) of mercury
								  condensed
Lead
7.392
3.520
Mercury
4.400
1.760
Silver
7.216
2.992
Zinc
25.700
10.740
Gold
1.760
Oil and grease
352.000
211.200
Total suspended solids
721.600
343.200
pH
(1)
(1)
(1) Within the range of 7.5 to 10.0 at all times.
Table 25-7
Primary Precious Metals and Mercury Calciner Stack Gas
					 Contact Cooling Water
BPT Effluent Limitations
Maximum for any 1 day
Maximum for monthly average
Pollutant or pollutant property
mg/kg (pounds per million pounds) of mercury
								  condensed
Lead
1.743
0.830
Mercury
1.038
0.415
Silver
1.702
0.706
Zinc
6.059
2.532
Gold
0.415
Oil and grease
83.000
49.800
Total suspended solids
170.200
80.930
pH
(1)
(1)
(1) Within the range of 7.5 to 10.0 at all times.
Table 25-8
Primary Precious Metals and Mercury Condenser
					 Blowdown
BPT Effluent Limitations
Maximum for any 1 day
Maximum for monthly average
Pollutant or pollutant property
mg/kg (pounds per million pounds) of mercury
								  condensed
Lead
5.796
2.760
Mercury
3.450
1.380
Silver
5.658
2.346
Zinc
20.150
8.418
Gold
1.380
Oil and grease
276.000
165.600
Total suspended solids
565.800
269.100
pH
(1)
(1)
(1) Within the range of 7.5 to 10.0 at all times.
Table 25-9
Primary Precious Metals and Mercury Mercury Cleaning Bath
					 Water
BPT Effluent Limitations
Maximum for any 1 day
Maximum for monthly average
Pollutant or pollutant property
mg/kg (pounds per million pounds) of mercury
								  condensed
Lead
0.588
0.280
Mercury
0.350
0.140
Silver
0.574
0.238
Zinc
2.044
0.854
Gold
0.140
Oil and grease
28.000
16.800
Total suspended solids
57.400
27.300
pH
(1)
(1)
(1) Within the range of 7.5 to 10.0 at all times.