Wisconsin Administrative Code › Department of Natural Resources › NR 200-299 - Environmental Protection Wisconsin Pollutant Discharge Elimination System › Chapter NR 257 - Aluminum forming › Subchapter I - Rolling With Neat Oils Subcategory › Section NR 257.12 - 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 1
Core with an annealing furnace scrubber
					 BPT
Pollutant or pollutant property
Maximum for
any 1 day
Maximum for monthly average
mg/off-kg (lb/million off-lbs) of aluminum rolled
								  with neat oils
Chromium
0.0360
0.0147
Cyanide
0.0237
0.0098
Zinc
0.119
0.0498
Aluminum
0.525
0.257
Oil and grease
1.634
0.980
Suspended solids
3.348
1.593
pH
(1)
(1)
1Within the range of 7.0 to 10
					 at all times.
Table 2
Core without an annealing furnace scrubber
					 BPT
Pollutant or pollutant property
Maximum for any 1 day
Maximum for monthly average
mg/off-kg (lb/million off-lbs) of aluminum rolled
								  with neat oils
Chromium
0.0244
0.010
Cyanide
0.0161
0.0067
Zinc
0.0808
0.0338
Aluminum
0.356
0.174
Oil and grease
1.11
0.664
Suspended solids
2.27
1.079
pH
(1)
(1)
1 Within the range of 7.0 to 10
					 at all times.
Table 3
Continuous sheet casting spent lubricant
					 BPT
Pollutant or pollutant property
Maximum for any 1 day
Maximum for monthly average
mg/off-kg (lb/million off-lbs) of aluminum sheet
								  cast by continuous methods
Chromium
0.00086
0.00035
Cyanide
0.00057
0.00024
Zinc
0.0029
0.0012
Aluminum
0.0127
0.0063
Oil and grease
0.0393
0.0236
Suspended solids
0.805
0.0383
pH
(1)
(1)
1 Within the range of 7.0 to 10 at all times.
Table 4
Solution heat treatment contact cooling water
					 BPT
Pollutant or pollutant property
Maximum for any 1 day
Maximum for monthly average
mg/off-kg (lb/ of million off-lbs)aluminu m
								  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
pH
315.91 (1)
150.25 (1)
1 Within the range of 7.0 to 10
					 at all times.
Table 5
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
0.262
0.110
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 6
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 7
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.