Metal Finishing Guide Book

2012-2013

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725 Process Solvents Emulsifying agents Alkalis Acids ��� Acids ��� ��� ��� ��� Material Input ��� Acid/alkaline solutions ��� Heavy metal-bearing solutions ��� Cyanide-bearing solutions ��� Metals (e.g., salts) ��� Complexing agents ��� Alkalis Chemical Conversion Coatings Electroplating Plating Table 1. Process Inputs and Pollution Generated by Metal Finishingvii Miscellaneous (e.g., polishing, hot dip coating and etching) ��� Dilute metals ��� Dilute acids Anodizing Surface Finishing Solvent Degreasing and Emulsion Alkaline and Acid Cleaning Surface Preparation ��� Metal fumes ��� Acid fumes ��� Particulates ��� Metal ion-bearing mists ��� Acid mists ��� Metal ion-bearing mists ��� Acid mists ��� Metal ion-bearing mists ��� Acid mists ��� Metal ion-bearing mists ��� Acid mists ��� Solvents ��� Caustic mists Air Emission ��� Metal ��� Acid wastes ��� Cyanide ��� Metal wastes ��� Acid/alkaline ��� Cyanide ��� Metal wastes ��� Metal salts ��� Acid ��� Base wastes ��� Acid wastes ��� Solvent ��� Alkaline ��� Acid wastes Process Wastewater ��� ��� ��� ��� Polishing sludges Hot dip tank dross Etching sludges Scrubber residues ��� Cyanide ��� Metal wastes ��� Metal ��� Reactive wastes ��� Spent solutions ��� Wastewater treatment sludges ��� Base metals ��� Spent solutions ��� Wastewater treatment sludges ��� Base metals ��� Ignitable wastes ��� Solvent wastes ��� Still bottoms Solid Waste

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