Wis. Admin. Code Department of Natural Resources NR 256.23

Current through October 28, 2024

Section NR 256.23 - Effluent limitations representing the degree of effluent reduction attainable by the application of the best available technology economically achievable

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

		BAT Effluent Limitations
		Noncontinuous Direct Dischargers
Maximum for any 1 day	Maximum for monthly average	Maximum for any 1 day	Maximum for monthly average	Annual average
Pollutant or pollutant property	kg/1,000 kkg (pounds per million pounds) of metal poured		mg/l⁽¹⁾	mg/l⁽¹⁾	(2)
Copper (T)	0.0307	0.0168	0.77	0.42	0.0068
Lead (T)	0.0211	0.0104	0.53	0.26	0.006
Zinc (T)	0.0303	0.0116	0.76	0.29	0.0072

(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

		BAT Effluent Limitations
		Noncontinuous Direct Dischargers
Maximum for any 1 day	Maximum for monthly average	Maximum for any 1 day	Maximum for monthly average	Annual average
Pollutant or pollutant property	kg/1,000 kkg (pounds per million pounds) of metal poured		mg/l⁽¹⁾	mg/l⁽¹⁾	(2)
Copper (T)	0.928	0.506	0.77	0.42	0.205
Lead (T)	0.639	0.314	0.53	0.26	0.181
Zinc (T)	0.916	0.35	0.76	0.29	0.217

(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

		BAT Effluent Limitations
		Noncontinuous Direct Dischargers
Maximum for any 1 day	Maximum for monthly average	Maximum for any 1 day	Maximum for monthly average	Annual average
Pollutant or pollutant property	kg/62.3 million Sm³ (pounds per billion SCF) of air scrubbed		mg/l⁽¹⁾	mg/l⁽¹⁾	(2)
Copper (T)	0.553	0.301	0.77	0.42	0.122
Lead (T)	0.38	0.187	0.53	0.26	0.108
Zinc (T)	0.545	0.208	0.76	0.29	0.129
Total phenols	0.617	0.215	0.86	0.3	0.144

(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

		BAT Effluent Limitations
		Noncontinuous Direct Dischargers
Maximum for any 1 day	Maximum for monthly average	Maximum for any 1 day	Maximum for monthly average	Annual average
Pollutant or pollutant property	kg/1,000 kkg (pounds per million pounds) of metal poured		mg/l⁽¹⁾	mg/l⁽¹⁾	(2)
Copper (T)	8.48	4.63	0.77	0.42	1.87
Lead (T)	5.84	2.86	0.53	0.26	1.65
Zinc (T)	8.37	3.19	0.76	0.29	1.98

(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

		BAT Effluent Limitations
		Noncontinuous Direct Dischargers
Maximum for any 1 day	Maximum for monthly average	Maximum for any 1 day	Maximum for monthly average	Annual average
Pollutant or pollutant property	kg/62.3 million Sm³ (pounds per billion SCF) of air scrubbed		mg/l⁽¹⁾	mg/l⁽¹⁾	(2)
Copper (T)	1.81	0.988	0.77	0.42	0.4
Lead (T)	1.25	0.612	0.53	0.26	0.353
Zinc (T)	1.79	0.673	0.76	0.29	0.424
Total phenols	2.02	0.706	0.86	0.3	0.471

(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

		BAT Effluent Limitations
		Noncontinuous Direct Dischargers
Maximum for any 1 day	Maximum for monthly average	Maximum for any 1 day	Maximum for monthly average	Annual average
Pollutant or pollutant property	kg/1,000 kkg (pounds per million pounds) of metal poured		mg/l⁽¹⁾	mg/l⁽¹⁾	(2)
Copper (T)	0.392	0.214	0.77	0.42	0.0865
Lead (T)	0.27	0.132	0.53	0.26	0.0763
Zinc (T)	0.387	0.148	0.76	0.29	0.0916

(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.

Wis. Admin. Code Department of Natural Resources NR 256.23

Cr. Register, June 1989, No. 402, eff. 7-1-89.