Wisconsin Administrative Code › Department of Natural Resources › NR 200-299 - Environmental Protection Wisconsin Pollutant Discharge Elimination System › Chapter NR 257 - Aluminum forming › Subchapter III - The Extrusion Subcategory › Section NR 257.32 - Effluent limitations representing the degree of effluent reduction attainable by 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 the application of BPT:
Table 66
Core operation BPT
Pollutant or pollutant property
Maximum for any 1 day
Maximum for monthly average
mg/off-kg (lb/million off-lbs) of aluminum
								  extruded
Chromium
0.16
0.066
Cyanide
0.11
0.044
Zinc
0.53
0.22
Aluminum
2.34
1.16
Oil and grease
7.32
4.39
Suspended solids
15.00
7.13
pH
(1)
(1)
1 Within the range of 7.0 to 10
					 at all times.
Table 67
Extrusion press leakage BPT
Pollutant or pollutant property
Maximum for any 1 day
Maximum for monthly average
mg/off-kg (lb/million off-lbs) of aluminum
								  extruded
Chromium
0.65
0.27
Cyanide
0.43
0.18
Zinc
2.16
0.90
Aluminum
9.51
4.73
Oil and grease
29.56
17.74
Suspended solids
60.60
28.82
pH
(1)
(1)
1 Within the range of 7.0 to 10
					 at all times.
Table 68
Direct chill casting contact cooling water
					 BPT
Pollutant or pollutant property
Maximum for any 1 day
Maximum for monthly average
mg/off-kg (lb/million off-lbs) of aluminum
								  cast
Chromium
0.59
0.24
Cyanide
0.39
0.16
Zinc
1.94
0.81
Aluminum
8.55
4.26
Oil and grease
26.58
15.95
Suspended solids
54.49
25.92
pH
(1)
(1)
1 The pH shall be maintained
					 within the range of 7.0 to 10.0 at all times, except for those situations when
					 this waste stream is discharged separately and without commingling with any
					 other wastewater, in which case the pH shall be within the range of 6.0 to 10.0
					 at all times.
Table 69
Press heat treatment contact cooling water
					 BPT
Pollutant or pollutant property
Maximum for any 1 day
Maximum for monthly average
mg/off-kg (lb/million off-lbs) of aluminum
								  quenched
Chromium
3.39
1.39
Cyanide
2.24
0.93
Zinc
11.25
4.70
Aluminum
49.55
24.66
Oil and grease
154.10
92.46
Suspended solids
315.91
150.25
pH
(1)
(1)
1 Within the range of 7.0 to 10
					 at all times.
Table 70
Solution heat treatment contact cooling water
					 BPT
Pollutant or pollutant property
Maximum for any 1 day
Maximum for monthly average
mg/off-kg (lb/million off-lbs) of aluminum
								  quenched
Chromium
3.39
1.39
Cyanide
2.24
0.93
Zinc
11.25
4.70
Aluminum
49.55
24.66
Oil and grease
154.10
92.46
Suspended solids
315.91
150.25
pH
(1)
(1)
1 Within the range of 7.0 to 10
					 at all times.
Table 71
Cleaning or etching bath BPT
Pollutant or pollutant property
Maximum for any 1 day
Maximum for monthly average
mg/off-kg (lb/million off-lbs) of aluminum
								  cleaned or etched
Chromium
0.079
0.032
Cyanide
0.052
0.022
Zinc
0.26
0.109
Aluminum
1.15
0.573
Oil and grease
3.58
2.15
Suspended solids
7.34
3.49
pH
(1)
(1)
1 Within the range of 7.0 to 10
					 at all times.
Table 72
Cleaning or etching rinse and hot water seal
					 BPT
Pollutant or pollutant property
Maximum for any 1 day
Maximum for monthly average
mg/off-kg (lb/million off-lbs) of aluminum
								  cleaned or etched
Chromium
6.12
2.51
Cyanide
4.04
1.67
Zinc
20.31
8.49
Aluminum
89.46
44.52
Oil and grease
278.24
166.95
Suspended solids
570.39
271.29
pH
(1)
(1)
1 Within the range of 7.0 to 10
					 at all times.
Table 73
Cleaning or etching scrubber liquor BPT
Pollutant or pollutant property
Maximum for any 1 day
Maximum for monthly average
mg/off-kg (lb/million off-lbs) of aluminum
								  cleaned or etched
Chromium
7.00
2.86
Cyanide
4.61
1.91
Zinc
23.22
9.70
Aluminum
102.24
50.88
Oil and grease
318.00
190.80
Suspended solids
651.90
310.05
pH
(1)
(1)
1 Within the range of 7.0 to 10
					 at all times.
Table 74
Degassing scrubber liquor BPT
Pollutant or pollutant property
Maximum for any 1 day
Maximum for monthly average
mg/off-kg (lb/million off-lbs) of aluminum
								  degassed
Chromium
1.15
0.47
Cyanide
0.76
0.32
Zinc
3.81
1.59
Aluminum
16.78
8.35
Oil and grease
52.18
31.31
Suspended solids
106.97
50.88
pH
(1)
(1)
1 Within the range of 7.0 to 10
					 at all times.