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Project Name: Treatment of Compact Disc Manufacturing Wastewater for Metal Removal
Country: USA
Description: The client operates CD master manufacturing operations at plants located in California and Massachusetts. Historic waste handling practices have included the containerization of several waste streams for disposal as hazardous and non-hazardous wastes. In an effort to reduce the disposal of waste streams as hazardous waste, samples were obtained of seven segregated waste streams for analytical testing and independent confirmation of their hazardous characteristics. Waste streams demonstrating non-hazardous characteristics underwent further evaluation to identify pretreatment alternatives. Data generated from characterization and treatability testing was provided for use in the development of a single pretreatment system design that would meet the federal, state, and local requirements at either facility. Analytical results indicated that only two of the segregated samples have RCRA hazardous waste characteristics that preclude on-site pretreatment. The remaining samples were evaluated for treatability of non-hazardous levels of nickel and zinc employing a variety of chemical coagulants and flocculants as well as filtration technologies. It was determined the Dimethyldithiocarbamate (DOC) enhanced precipitation followed by coagulation and anionic polymer floc enhancement was capable of reducing metals to levels well below discharge limits.
 

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