Wis. Admin. Code Department of Natural Resources NR 256.43

Current through November 25, 2024

Section NR 256.43 - 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:

Table 75

ZINC 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)	0.0334	0.0187	0.77	0.42	0.0076
Lead (T)	0.0237	0.0116	0.53	0.26	0.0067
Zinc (T)	0.0339	0.0129	0.76	0.29	0.008

(1) These concentrations shall be multiplied by the ratio of (5.34/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 76

ZINC CASTING SUBCATEGORY DIE 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)	0.0066	0.0036	0.77	0.42	0.0015
Lead (T)	0.0046	0.0022	0.53	0.26	0.0013
Zinc (T)	0.0066	0.0025	0.76	0.29	0.0016
Total phenols	0.0074	0.0026	0.86	0.3	0.0017

(1) These concentrations shall be multiplied by the ratio of (1.04/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 77

ZINC 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 Sm SCF) of air scrubbe	I³ (pounds per billion d	mg/l⁽¹⁾	mg/l⁽¹⁾	(2)
Copper (T)	1.56	0.852	0.77	0.42	0.345
Lead (T)	1.07	0.527	0.53	0.26	0.304
Zinc (T)	1.54	0.588	0.76	0.29	0.365
Total phenols	1.74	0.608	0.86	0.3	0.406

(1) These concentrations shall be multiplied by the ratio of (0.243/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 78

ZINC CASTING SUBCATEGORY MOLD COOLING OPERATIONS

BAT Effluent Limitations
			Noncontinuous Direct Dischargers
Maximum for any 1 day	Maximum for monthly average	Maximum for 1 day	any 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)	0.304	0.166	0.77	0.42	0.067
Lead (T)	0.209	0.103	0.53	0.26	0.0591
Zinc (T)	0.3	0.114	0.76	0.29	0.071

(1) These concentrations shall be multiplied by the ratio of (47.3/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 256.43

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