Wis. Admin. Code Department of Natural Resources NR 274.032

Current through October 28, 2024

Section NR 274.032 - Effluent limitations representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available

(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.

Wis. Admin. Code Department of Natural Resources NR 274.032

Cr. Register, March, 1991, No. 423, eff. 4-1-91.