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

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 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