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 X - Metal Powders
Section NR 273.102 - 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 10-1
Metal Powders
Metal Powder Production Atomization 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 powder wet atomized |
|
|
Copper |
9.58 |
5.04 |
|
Cyanide |
1.46 |
0.605 |
|
Lead |
2.12 |
1.01 |
|
Oil and grease |
101 |
60.5 |
|
Total suspended solids |
207 |
98.3 |
|
pH |
(1) |
(1) |
(1) Within the range of 7.5 to 10.0 at all times
Table 10-2
Metal Powders
Sizing 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 powder sized |
|
|
Copper |
0.028 |
0.015 |
|
Cyanide |
0.004 |
0.002 |
|
Lead |
0.006 |
0.003 |
|
Oil and grease |
0.292 |
0.175 |
|
Total suspended solids |
0.599 |
0.285 |
|
pH |
(1) |
(1) |
(1) Within the range of 7.5 to 10.0 at all times
Table 10-3
Metal Powders
Steam Treatment
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 powder metallurgy parts steam treated |
|
|
Copper |
1.51 |
0.792 |
|
Cyanide |
0.230 |
0.095 |
|
Lead |
0.333 |
0.159 |
|
Oil and grease |
15.9 |
9.51 |
|
Total suspended solids |
32.5 |
15.5 |
|
pH |
(1) |
(1) |
(1) Within the range of 7.5 to 10.0 at all times
Table 10-4
Metal Powders
Tumbling, Burnishing, and 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 powder metallurgy parts tumbled, burnished, or cleaned |
|
|
Copper |
8.36 |
4.40 |
|
Cyanide |
1.28 |
0.528 |
|
Lead |
1.85 |
0.880 |
|
Oil and grease |
88.0 |
52.800 |
|
Total suspended solids |
181 |
85.8 |
|
pH |
(1) |
(1) |
(1) Within the range of 7.5 to 10.0 at all times
Table 10-5
Metal Powders
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 powder metallurgy parts sawed or ground with emulsion |
|
|
Copper |
0.035 |
0.018 |
|
Cyanide |
0.005 |
0.002 |
|
Lead |
0.008 |
0.004 |
|
Oil and grease |
0.362 |
0.217 |
|
Total suspended solids |
0.742 |
0.353 |
|
pH |
(1) |
(1) |
(1) Within the range of 7.5 to 10.0 at all times
Table 10-6
Metal Powders
Sawing or Grinding 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 powder metallurgy parts sawed or ground with contact cooling water |
|
|
Copper |
3.08 |
1.62 |
|
Cyanide |
0.470 |
0.195 |
|
Lead |
0.681 |
0.324 |
|
Oil and grease |
32.4 |
19.5 |
|
Total suspended solids |
66.4 |
31.6 |
|
pH |
(1) |
(1) |
(1) Within the range of 7.5 to 10.0 at all times
Table 10-7
Metal Powders
Hot Pressing 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 powder cooled after pressing |
|
|
Copper |
16.7 |
8.80 |
|
Cyanide |
2.55 |
1.06 |
|
Lead |
3.70 |
1.76 |
|
Oil and grease |
176 |
106 |
|
Total suspended solids |
361 |
172 |
|
pH |
(1) |
(1) |
(1) Within the range of 7.5 to 10.0 at all times
Table 10-8
Metal Powders
Mixing 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 powder mixed |
|
|
Copper |
15.0 |
7.90 |
|
Cyanide |
2.29 |
0.948 |
|
Lead |
3.32 |
1.58 |
|
Oil and grease |
158 |
94.8 |
|
Total suspended solids |
324 |
154 |
|
pH |
(1) |
(1) |
(1) Within the range of 7.5 to 10.0 at all times
