Wisconsin Administrative Code
Department of Natural Resources
NR 200-299 - Environmental Protection Wisconsin Pollutant Discharge Elimination System
Chapter NR 274 - Nonferrous metals manufacturing
Subchapter III - Secondary Aluminum Smelting
Section NR 274.032 - Effluent limitations representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available
Current through August 26, 2024
(1) 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.
(2) Facilities which use water for metal cooling may not discharge process wastewater pollutants to waters of the state.
(3) Facilities which use aluminum fluoride in their magnesium removal process may not discharge process wastewater pollutants to waters of the state.
(4) Facilities which use chlorine in their magnesium removal process shall achieve the following limitations:
Table 3-1
Secondary Aluminum Smelting Magnesium Removal Process Using Chlorine
|
BPT Effluent Limitations |
|
|
Maximum av values for 30 cerage of daily onsecutive days |
|
|
Pollutant or pollutant property |
kg/kkg (pounds per 1,000 pounds) of magnesium removed |
|
Total suspended solids |
175 |
|
Chemical oxygen demand |
6.5 |
|
pH |
(1) |
(1) Within the range of 7.5 to 9.0.
(5) Facilities which process residues by wet methods shall achieve the following limitations:
Table 3-2
Secondary Aluminum Smelting Residue Processed By Wet Methods
|
BPT Effluent Limitations |
|
|
Maximum aver values for 30 conage of daily secutive days |
|
|
Pollutant or pollutant property |
kg/kkg (pounds per 1,000 pounds) of hot aluminum metal |
|
Total suspended solids |
1.5 |
|
Fluoride |
0.4 |
|
Ammonia (as N) |
0.01 |
|
Aluminum |
1.0 |
|
Copper |
0.003 |
|
Chemical oxygen demand |
1.0 |
|
pH |
(1) |
(1) Within the range of 7.5 to 9.0.
