Metal Finishing Guide Book

2012-2013

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Table I. Electroplating Job Shop Effluent Guidelines���Pretreatment Standards for Existing Sources Greater than 10,000 gal/day Average of daily values for 4 Maximum for consecutive monitoring Pollutant any 1 day days shall not exceed Cadmium 1.2 0.7 Chrome 7.0 4.0 Copper 4.5 2.7 Lead 0.6 0.4 Nickel 4.1 2.6 Zinc 4.2 2.6 Cyanide, total 1.9 1.0 Total metalsa 10.5 6.8 Total toxic organics 2.13 ��� 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 treatment 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 federal regulations. Often, these local limits are 10-25% of the Table I and II concentrations. Properly selecting wastewater treatment technology, modifying production Table II. Metal Finishing Pretreatment Standards for Dischargers to POTWs Existing Source New Source 1-day 30-day 1-day Parameter maximum average maximum Cadmium 0.69 0.26 0.11 Chrome 2.77 1.71 2.77 Copper 3.38 2.07 3.38 Lead 0.69 0.43 0.69 Nickel 3.98 2.38 3.98 Silver 0.43 0.24 0.43 Zinc 2.61 1.48 2.61 Cyanide, total 1.20 0.65 1.20 Cyanide, amenable 0.86 0.32 0.86 Total toxic organics 2.13 ��� 2.13 POTW, publicly owned treatment works. All values in mg/L. 626 30-day average 0.07 1.71 2.07 0.43 2.38 0.24 1.48 0.65 0.32 ���

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