40 CFR 464.23 - Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best available technology economically achievable.

View all text of Subpart B [§ 464.20 - § 464.27]

§ 464.23 - Effluent limitations guidelines 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 through 125.32, any existing point source subject to this subpart must achieve the following effluent limitations representing the degree of effluent reduction attainable by the application of the best available technology economically achievable, except that non-continuous dischargers shall not be subject to the maximum day and maximum for monthly average mass (kg/1,000 kkg or lb/million lb of metal poured; kg/62.3 million Sm 3 or lb/billion SCF of air scrubbed) effluent limitations for copper, lead, zinc, and total phenols. For non-continuous discharges, annual average mass limitations and maximum day and maximum for monthly average concentration (mg/l) limitations shall apply. Concentration limitations and annual average mass limitations shall only apply to non-continuous dischargers.

(a) Casting Quench Operations.

BAT Effluent Limitations

Pollutant or pollutant property	Maximum for any 1 day	Maximum for monthly average		kg/1,000 kkg (pounds per million pounds) of metal poured		Copper (T)	0.0307	.0168	Lead (T)	0.0211	.0104	Zinc (T)	0.0303	.0116

	Maximum for any 1 day	Maximum for monthly average	Annual average 1		(mg/l) 2	(mg/l) 2		Copper (T)	0.77	0.42	0.0068	Lead (T)	0.53	0.26	0.006	Zinc (T)	0.76	0.29	0.0072

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

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

(b) Direct Chill Casting Operations.

BAT Effluent Limitations

Pollutant or pollutant property	Maximum for any 1 day	Maximum for monthly average		kg/1,000 kkg (pounds per million pounds) of metal poured		Copper (T)	0.928	0.506	Lead (T)	0.639	0.314	Zinc (T)	0.916	0.35

	Maximum for any 1 day	Maximum for monthly average	Annual average 1		(mg/l) 2	(mg/l) 2		Copper (T)	0.77	0.42	0.205	Lead (T)	0.53	0.26	0.181	Zinc (T)	0.76	0.29	0.217

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

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

BAT Effluent Limitations

Pollutant or pollutant property	Maximum for any 1 day	Maximum for monthly average		kg/62.3 million Sm 3 (pounds per billion SCF) of air scrubbed		Copper (T)	0.553	0.301	Lead (T)	0.38	0.187	Zinc (T)	0.545	0.208	Total phenols	0.617	0.215

	Maximum for any 1 day	Maximum for monthly average	Annual average 1		(mg/l) 2	(mg/l) 2		Copper (T)	0.77	0.42	0.122	Lead (T)	0.53	0.26	0.108	Zinc (T)	0.76	0.29	0.129	Total phenols	0.86	0.3	0.144

1 kg/62.3 million Sm 3 (pounds per billion SCF) of air scrubbed.

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

(d) Grinding Scrubber Operations. No discharge of process wastewater pollutants to navigable waters.

(e) Investment Casting.

BAT Effluent Limitations

Pollutant or pollutant property	Maximum for any 1 day	Maximum for monthly average		kg/1000 kkg (pounds per million pounds) of metal poured		Copper (T)	8.48	4.63	Lead (T)	5.84	2.86	Zinc (T)	8.37	3.19

	Maximum for any 1 day	Maximum for monthly average	Annual average 1		(mg/l) 2	(mg/l) 2		Copper (T)	0.77	0.42	1.87	Lead (T)	0.53	0.26	1.65	Zinc (T)	0.76	0.29	1.98

1 kg/1000 kkg (pounds per million pounds) of metal poured.

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

(f) Melting Furnace Scrubber Operations.

BAT Effluent Limitations

Pollutant or pollutant property	Maximum for any 1 day	Maximum for monthly average		kg/62.3 million Sm 3 (pounds per billion SCF) of air scrubbed		Copper (T)	1.81	0.988	Lead (T)	1.25	0.612	Zinc (T)	1.79	0.673	Total phenols	2.02	0.706

	Maximum for any 1 day	Maximum for monthly average	Annual average 1		(mg/l) 2	(mg/l) 2		Copper (T)	0.77	0.42	0.4	Lead (T)	0.53	0.26	0.353	Zinc (T)	0.76	0.29	0.424	Total phenols	0.86	0.3	0.471

1 kg/62.3 million Sm 3 (pounds per billion SCF) of air scrubbed.

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

(g) Mold Cooling Operations.

BAT Effluent Limitations

Pollutant or pollutant property	Maximum for any 1 day	Maximum for monthly average		kg/1,000 kkg (pounds per million pounds) of metal poured		Copper (T)	0.392	0.214	Lead (T)	0.27	0.132	Zinc (T)	0.387	0.148

	Maximum for any 1 day	Maximum for monthly average	Annual average 1		(mg/l) 2	(mg/l) 2		Copper (T)	0.77	0.42	0.0865	Lead (T)	0.53	0.26	0.0763	Zinc (T)	0.76	0.29	0.0916

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

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

[50 FR 45247, Oct. 30, 1985; 51 FR 21761, June 16, 1986]