Wisconsin Administrative Code
Department of Natural Resources
NR 200-299 - Environmental Protection Wisconsin Pollutant Discharge Elimination System
Chapter NR 273 - Nonferrous metals forming and metal powders
Subchapter II - Magnesium
Section NR 273.022 - 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 2-1
Magnesium
Rolling Spent Emulsions
|
BPT Effluent Limitations |
||
|
Maximum for any 1 day |
Maximum for monthly average |
|
|
Pollutant or pollutant property |
mg/off-kg (pounds per million off-pounds) of magnesium rolled with emulsions |
|
|
Chromium |
0.033 |
0.014 |
|
Zinc |
0.109 |
0.046 |
|
Ammonia |
9.95 |
4.37 |
|
Fluoride |
4.440 |
1.97 |
|
Oil and grease |
1.49 |
0.895 |
|
Total suspended solids |
3.06 |
1.46 |
|
pH |
(1) |
(1) |
(1) Within the range of 7.5 to 10.0 at all times
Table 2-2
Magnesium
Forging Contact Cooling Water
|
BPT Effluent Limitations |
||
|
Maximum for any 1 day |
Maximum for monthly average |
|
|
Pollutant or pollutant property |
mg/off-kg (pounds per million off-pounds) of forged magnesium cooled with water |
|
|
Chromium |
1.27 |
0.520 |
|
Zinc |
4.22 |
1.77 |
|
Ammonia |
385 |
170 |
|
Fluoride |
172 |
76.3 |
|
Oil and grease |
57.8 |
34.7 |
|
Total suspended solids |
119 |
56.4 |
|
pH |
(1) |
(1) |
(1) Within the range of 7.5 to 10.0 at all times
Table 2-3
Magnesium
Forging Equipment Cleaning Wastewater
|
BPT Effluent Limitations |
||
|
Maximum for any 1 day |
Maximum for monthly average |
|
|
Pollutant or pollutant property |
mg/off-kg (pounds per million off-pounds) of forged magnesium |
|
|
Chromium |
0.018 |
0.007 |
|
Zinc |
0.059 |
0.025 |
|
Ammonia |
5.32 |
2.34 |
|
Fluoride |
2.38 |
1.06 |
|
Oil and grease |
0.798 |
0.479 |
|
Total suspended solids |
1.64 |
0.778 |
|
pH |
(1) |
(1) |
(1) Within the range of 7.5 to 10.0 at all times
Table 2-4
Magnesium
Direct Chill Casting Contact Cooling Water
|
BPT Effluent Limitations |
||
|
Maximum for any 1 day |
Maximum for monthly average |
|
|
Pollutant or pollutant property |
mg/off-kg (pounds per million off-pounds) of magnesium cast with direct chill methods |
|
|
Chromium |
1.74 |
0.711 |
|
Zinc |
5.77 |
2.41 |
|
Ammonia |
527 |
232 |
|
Fluoride |
235 |
105 |
|
Oil and grease |
79.0 |
47.4 |
|
Total suspended solids |
162 |
77.1 |
|
pH |
(1) |
(1) |
(1) Within the range of 7.5 to 10.0 at all times
Table 2-5
Magnesium
Surface Treatment Spent Baths
|
BPT Effluent Limitations |
||
|
Maximum for any 1 day |
Maximum for monthly average |
|
|
Pollutant or pollutant property |
mg/off-kg (pounds per million off-pounds) of magnesium surface treated |
|
|
Chromium |
0.205 |
0.084 |
|
Zinc |
0.681 |
0.285 |
|
Ammonia |
62.1 |
27.3 |
|
Fluoride |
27.8 |
12.3 |
|
Oil and grease |
9.32 |
5.59 |
|
Total suspended solids |
19.1 |
9.09 |
|
pH |
(1) |
(1) |
(1) Within the range of 7.5 to 10.0 at all times
Table 2-6
Magnesium
Surface Treatment Rinse
|
BPT Effluent Limitations |
||
|
Maximum for any 1 day |
Maximum for monthly average |
|
|
Pollutant or pollutant property |
mg/off-kg(pounds per million off-pounds) of magnesium surface treated |
|
|
Chromium |
8.32 |
3.4 |
|
Zinc |
27.6 |
11.5 |
|
Ammonia |
2520 |
1110 |
|
Fluoride |
1130 |
499 |
|
Oil and grease |
378 |
227 |
|
Total suspended solids |
775 |
369 |
|
pH |
(1) |
(1) |
(1) Within the range of 7.5 to 10.0 at all times
Table 2-7
Magnesium
Sawing or Grinding Spent Emulsions
|
BPT Effluent Limitations |
||
|
Maximum for any 1 day |
Maximum for monthly average |
|
|
Pollutant or pollutant property |
mg/off-kg (pounds per million off-pounds) of magnesium sawed or ground |
|
|
Chromium |
0.009 |
0.004 |
|
Zinc |
0.029 |
0.012 |
|
Ammonia |
2.60 |
1.15 |
|
Fluoride |
1.16 |
0.515 |
|
Oil and grease |
0.390 |
0.234 |
|
Total suspended solids |
0.800 |
0.381 |
|
pH |
(1) |
(1) |
(1) Within the range of 7.5 to 10.0 at all times
Table 2-8
Magnesium
Wet Air Pollution Control Scrubber Blowdown
|
BPT Effluent Limitations |
||
|
Maximum for any 1 day |
Maximum for monthly average |
|
|
Pollutant or pollutant property |
mg/off-kg (pounds per million off-pounds) of magnesium sanded and repaired or forged |
|
|
Chromium |
0.273 |
0.112 |
|
Zinc |
0.904 |
0.378 |
|
Ammonia |
82.5 |
36.3 |
|
Fluoride |
36.9 |
16.4 |
|
Oil and grease |
12.4 |
7.43 |
|
Total suspended solids |
25.4 |
12.1 |
|
pH |
(1) |
(1) |
(1) Within the range of 7.5 to 10.0 at all times
