Wisconsin Administrative Code
Department of Natural Resources
NR 200-299 - Environmental Protection Wisconsin Pollutant Discharge Elimination System
Chapter NR 256 - Metal molding and casting
Subchapter II - Copper Casting Subcategory
Section NR 256.23 - Effluent limitations representing the degree of effluent reduction attainable by the application of the best available technology economically achievable

Current through August 26, 2024

Except as provided in 40 CFR 125.30 to 125.32, any existing point source subject to this subchapter, including noncontinuous direct dischargers, shall achieve the following BAT effluent limitations. Grinding scrubber operations may not discharge process wastewater pollutants to waters of the state.

TABLE 21

COPPER CASTING SUBCATEGORY

CASTING QUENCH OPERATIONS

(1) These concentrations shall be multiplied by the ratio of (4.8/x) where x is the actual normalized process wastewater discharge flow (in gallons per 1,000 pounds of metal poured) for a specific plant.

(2) kg/1,000 kkg (pounds per million pounds) of metal poured.

TABLE 22

COPPER CASTING SUBCATEGORY

DIRECT CHILL CASTING OPERATIONS

(1) These concentrations shall be multiplied by the ratio of (145/x) where x is the actual normalized process wastewater discharge flow (in gallons per 1,000 pounds of metal poured) for a specific plant.

(2) kg/1,000 kkg (pounds per million pounds) of metal poured.

TABLE 23

COPPER CASTING SUBCATEGORY

DUST COLLECTION SCRUBBER OPERATIONS

(1) These concentrations shall be multiplied by the ratio of (0.086/x) where x is the actual normalized process wastewater discharge flow (in gallons per 1,000 SCF of air scrubbed) for a specific plant.

(2) kg/62.3 million Sm3 (pounds per billion SCF) of air scrubbed.

TABLE 24

COPPER CASTING SUBCATEGORY

INVESTMENT CASTING

(1) These concentrations shall be multiplied by the ratio of (1,320/x) where x is the actual normalized process wastewater discharge flow (in gallons per 1,000 pounds of metal poured) for a specific plant.

(2) kg/1,000 kkg (pounds per million pounds) of metal poured.

TABLE 25

COPPER CASTING SUBCATEGORY

MELTING FURNACE SCRUBBER OPERATIONS

(1) These concentrations shall be multiplied by the ratio of (0.282/x) where x is the actual normalized process wastewater discharge flow (in gallons per 1,000 SCF of air scrubbed) for a specific plant.

(2) kg/62.3 million Sm3 (pounds per billion SCF) of air scrubbed. -

TABLE 26

COPPER CASTING SUBCATEGORY

MOLD COOLING OPERA TIONS

(1) These concentrations shall be multiplied by the ratio of (61/x) where x is the actual normalized process wastewater discharge flow (in gallons per 1,000 pounds of metal poured) for a specific plant.

(2) kg/1,000 kkg (pounds per million pounds) of metal poured.