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The development of the Membrane/Drum Dryer Process for use on treating Flexographic Ink Washwaters is discussed. The system is a physical treatment process designed to remove the organic and heavy metal contaminants in washwaters. It produces a liquid and solid by-product The liquid by-product is clean enough to discharge to the local sewer or can be reused. The solid material, comprised of ink residue, is dried non-leachable, flaky powder that can be sent to the local landfill. Tables are provided that compares the waste strength of the raw flexo washwater to the typical effluent from the membrane/drum dryer process and the typical pre-treatment limits imposed by a municipality A table describing TCLP test results is also enclosed.
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Flexographic Ink Washwater Treatment Using the Membrane/Drum Dryer Process, 1997 Environmental Confe