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 273.023 - Effluent limitations representing the degree of effluent reduction attainable by the application of the best available technology economically achievable
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 BAT:
Table 2-9
Magnesium
Rolling Spent Emulsions
|
BAT 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 |
4.44 |
1.97 |
Table 2-10
Magnesium
Forging Contact Cooling Water
|
BAT 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 |
0.127 |
0.052 |
|
Zinc |
0.422 |
0.177 |
|
Ammonia |
38.5 |
17.0 |
|
Fluoride |
17.2 |
7.63 |
Table 2-11
Magnesium
Forging Equipment Cleaning Wastewater
|
BAT 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 |
0.002 |
0.0007 |
|
Zinc |
0.006 |
0.003 |
|
Ammonia |
0.532 |
0.234 |
|
Fluoride |
0.238 |
0.106 |
Table 2-12
Magnesium
Direct Chill Casting Contact Cooling Water
|
BAT 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 |
Table 2-13
Magnesium
Surface Treatment Spent Baths
|
BAT 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 |
Table 2-14
Magnesium
Surface Treatment Rinse
|
BAT 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 |
0.832 |
0.340 |
|
Zinc |
2.76 |
1.16 |
|
Ammonia |
252 |
111 |
|
Fluoride |
113 |
49.9 |
Table 2-15
Magnesium
Sawing or Grinding Spent Emulsions
|
BAT 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 |
Table 2-16
Magnesium
Wet Air Pollution Control Scrubber Blowdown
|
BAT 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 |
