Metal Finishing Guide Book

2011-2012 Surface Finishing Guidebook

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Table I. Electroplating Job Shop Effluent Guidelines—Pretreatment Standards for Existing Sources Greater than 10,000 gal/day Pollutant Cadmium Chrome Copper Lead Nickel Zinc Cyanide, total Total metalsa Total toxic organics Maximum for any 1 day 1.2 7.0 4.5 0.6 4.1 4.2 1.9 10.5 2.13 consecutive monitoring days shall not exceed 0.7 4.0 2.7 0.4 2.6 2.6 1.0 6.8 — All values in mg/L; total metals is the sum of chromium, copper, nickel, and zinc. industry has taken major strides in pollution control through wastewater treat- ment system installation and operation, admirably fulfilling the regulatory intent. Substantial historical reductions for all metals have been demonstrated at many POTWs nationwide. STATUS OF WASTEWATER REGULATIONS The federal regulations listed in Tables I and II have now been in existence in excess of 10 years since the 1984 compliance dates. For those metal finishing companies still fortunate to be limited by these regulations, each limit and the applicability of the regulations are of intimate familiarity and compliance is being achieved on a day-to-day basis. Increasingly, POTWs are imposing, or are being forced to impose, local pretreatment limitations that are much more stringent than the fed- eral regulations. Often, these local limits are 10-25% of the Table I and II con- centrations. Properly selecting wastewater treatment technology, modifying production Table II. Metal Finishing Pretreatment Standards for Dischargers to POTWs Existing Source New Source 30-day Parameter Cadmium Chrome Copper Lead Nickel Silver Zinc Cyanide, total Cyanide, amenable Total toxic organics 524 maximum 0.69 2.77 3.38 0.69 3.98 0.43 2.61 1.20 0.86 2.13 POTW, publicly owned treatment works. All values in mg/L. 1-day average 0.26 1.71 2.07 0.43 2.38 0.24 1.48 0.65 0.32 — maximum 0.11 2.77 3.38 0.69 3.98 0.43 2.61 1.20 0.86 2.13 1-day 30-day average 0.07 1.71 2.07 0.43 2.38 0.24 1.48 0.65 0.32 — Average of daily values for 4

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