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 274.122 - 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 12-1
Secondary Silver Film Stripping
BPT Effluent Limitations
Maximum for any 1 day
Maximum for monthly average
Pollutant or pollutant property
mg/troy ounce of silver from film
								  stripping
Copper
95.670
50.350
Zinc
73.510
30.720
Ammonia (as N)
6,712.000
2,951.000
Total suspended solids
2,065.000
981.800
pH
(1)
(1)
(1) Within the range of 7.5 to 10.0 at all times.
Table 12-2
Secondary Silver Film Stripping Wet Air Pollution Control
					 and Precipitation and Filtration of Film Stripping Solutions Wet Air Pollution
					 Control
BPT Effluent Limitations
Maximum for any 1 day
Maximum for monthly average
Pollutant or pollutant property
mg/troy ounce precipitation and stripping
of silver from filtration of film
								  solutions
Copper
1.843
0.970
Zinc
1.416
0.592
Ammonia (as N)
129.300
56.840
Total suspended solids
39.770
18.920
pH
(1)
(1)
(1) Within the range of 7.5 to 10.0 at all times.
Table 12-3
Secondary Silver Precipitation and Filtration of Film
					 Stripping Solutions
BPT Effluent Limitations
Maximum for any 1 day
Maximum for monthly average
Pollutant or pollutant property
mg/troy ounce of silver precipitated
Copper
109.400
57.570
Zinc
84.050
35.120
Ammonia (as N)
7,674.000
3,374.000
Total suspended solids
2,361.000
1,123.000
pH
(1)
(1)
(1) Within the range of 7.5 to 10.0 at all times.
Table 12-4
Secondary Silver Precipitation and Filtration of
					 Photographic Solutions
BPT Effluent Limitations
Maximum for any 1 day
Maximum for monthly average
Pollutant or pollutant property
mg/troy ounce of silver precipitated
Copper
50.540
26.600
Zinc
38.836
16.226
Ammonia (as N)
3,545.000
1,559.000
Total suspended solids
1,090.600
518.700
pH
(1)
(1)
(1) Within the range of 7.5 to 10.0 at all times.
Table 12-5
Secondary Silver Precipitation and Filtration of
					 Photographic Solutions 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 from precipitation and
								  filtration of photographic solutions
Copper
23.070
12.140
Zinc
17.730
7.406
Ammonia (as N)
1,618.000
711.400
Total suspended solids
497.800
236.800
pH
(1)
(1)
(1) Within the range of 7.5 to 10.0 at all times.
Table 12-6
Secondary Silver Electrolytic Refining
BPT Effluent Limitations
Maximum for any 1 day
Maximum for monthly average
Pollutant or pollutant property
mg/troy ounce of silver from electrolytic
								  refining
Copper
1.444
0.760
Zinc
1.110
0.464
Ammonia (as N)
101.300
44.540
Total suspended solids
31.160
14.820
pH
(1)
(1)
(1) Within the range of 7.5 to 10.0 at all times.
Table 12-7
Secondary Silver Furnace 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 roasted, smelted, or
								  dried
Copper
1.273
0.670
Zinc
0.978
0.409
Ammonia (as N)
89.310
39.260
Total suspended solids
27.470
13.070
pH
(1)
(1)
(1) Within the range of 7.5 to 10.0 at all times.
Table 12-8
Secondary Silver Leaching
BPT Effluent Limitations
Maximum for any 1 day
Maximum for monthly average
Pollutant or pollutant property
mg/troy ounce of silver produced from
								  leaching
Copper
0.164
0.086
Zinc
0.126
0.053
Ammonia (as N)
11.470
5.040
Total suspended solids
3.526
1.677
pH
(1)
(1)
(1) Within the range of 7.5 to 10.0 at all times.
Table 12-9
Secondary Silver Leaching Wet Air Pollution Control and
					 Precipitation of Nonphotographic Solutions 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 produced from leaching or
								  precipitated
Copper
8.417
4.430
Zinc
6.468
2.703
Ammonia (as N)
590.500
259.600
Total suspended solids
181.700
86.390
pH
(1)
(1)
(1) Within the range of 7.5 to 10.0 at all times.
Table 12-10
Secondary Silver Precipitation and Filtration of
					 Nonphotographic Solutions
BPT Effluent Limitations
Maximum for any 1 day
Maximum for monthly average
Pollutant or pollutant property
mg/troy ounce of silver precipitated
Copper
5.833
3.070
Zinc
4.482
1.873
Ammonia (as N)
409.300
179.900
Total suspended solids
125.900
59.870
pH
(1)
(1)
(1) Within the range of 7.5 to 10.0 at all times.
Table 12-11
Secondary Silver Floor and Equipment Washdown
BPT 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
Total suspended solids
0.000
0.000
pH
(1)
(1)
(1) Within the range of 7.5 to 10.0 at all
					 times.