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 Code of Federal Regulations (Last Updated: July 5, 2024)
 Title 40 - Protection of Environment
 Chapter I - Environmental Protection Agency
 SubChapter N - Effluent Guidelines and Standards
 Part 464 - Metal Molding and Casting Point Source Category
 Subpart D - Zinc Casting Subcategory

  § 464.43 - Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best available technology economically achievable.  

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  • § 464.43 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 Sm3 or lb/billion SCF of air scrubbed) effluent limitations for copper, lead, zinc, and total phenols. For non-continuous dischargers, annual average mass limitations and maximum day and maximum for monthly average concentration (mg/1) 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) 0.0344 0.0187
    Lead (T) 0.0237 0.0116
    Zinc (T) 0.0339 0.0129
    Maximum for any 1 day Maximum for monthly average Annual average1
    (mg/l)2 (mg/l)2
    Copper (T) 0.77 0.42 0.0076
    Lead (T) 0.53 0.26 0.0067
    Zinc (T) 0.76 0.29 0.008

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

    2 These concentrations must be multiplied by the ratio of (5.34/x) where x is the actual normalized process wastewater flow (in gallons per 1,000 pounds of metal poured) for a specific plant.

    (b) Die 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) 0.0066 0.0036
    Lead (T) 0.0046 0.0022
    Zinc (T) 0.0066 0.0025
    Total phenols 0.0074 0.0026
    Maximum for any 1 day Maximum for monthly average Annual average1
    (mg/l)2 (mg/l)2
    Copper (T) 0.77 0.42 0.0015
    Lead (T) 0.53 0.26 0.0013
    Zinc (T) 0.76 0.29 0.0016
    Total phenols 0.86 0.3 0.0017

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

    2 These concentrations must be multiplied by the ratio of (1.04/x) where x is the actual normalized process wastewater flow (in gallons per 1,000 pounds of metal poured) for a specific plant.

    (c) Melting Furnace Scrubber Operations.

    BAT Effluent Limitations

    Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
    kg/62.3 million Sm3 (pounds per billion SCF) of air scrubbed
    Copper (T) 1.56 0.852
    Lead (T) 1.07 0.527
    Zinc (T) 1.54 0.588
    Total phenolse 1.74 0.608
    Maximum for any 1 day Maximum for monthly average Annual average1
    (mg/l)2 (mg/l)2
    Copper (T) 0.77 0.42 0.345
    Lead (T) 0.53 0.26 0.304
    Zinc (T) 0.76 0.29 0.365
    Total phenols 0.86 0.3 0.406

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

    2 These concentrations must be multiplied by the ratio of (0.243/x) where x is the actual normalized process wastewater flow (in gallons per 1,000 pounds of metal poured) for a specific plant.

    (d) 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) 0.304 0.166
    Lead (T) 0.209 0.103
    Zinc (T) 0.3 0.114
    Maximum for any 1 day Maximum for monthly average Annual average1
    (mg/l)2 (mg/l)2
    Copper (T) 0.77 0.42 0.067
    Lead (T) 0.53 0.26 0.0591
    Zinc (T) 0.76 0.29 0.071

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

    2 These concentrations must be multiplied by the ratio of (47.3/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 21762, June 16, 1986]