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
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.
