Evaluation of Electrodialysis for Chromic Acid Recovery and Purification at Corpus Christi Army Depot
Final rept. Oct 1989-Apr 1991
IT ENVIRONMENTAL PROGRAMS INC CINCINNATI OH
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A large quantity of hazardous waste is generated during the maintenance, repair, and overhaul of a wide variety of military equipment at Army depots. Some of this waste is generated by the use of chronic acid solutions for chromium electroplating and the application and removal of chromate conversion coatings. Hazardous waste results when metal contamination builds up in the solutions to such a degree that the solutions must be disposed of as hazardous waste. Removal of this metal contamination should result in a lengthened bath life and reduced hazardous waste generation. As part of its pollution abatement and environmental control mission, the U.S. Army Toxic and Hazardous Materials Agency USATHAMA is pursuing R and D projects to assist depots in meeting the Army goal of a 50 percent reduction in hazardous waste by the end of 1992 compared with 1985 baseline levels. In one project, USATHAMA purchased, installed, operated, and evaluated an electrodialysis system on two chromic acid process solutions at Corpus Christi Army Depot CCAD in Corpus Christi, Texas. The objective of this task was to evaluate the systems ability to remove metal contamination and oxidize trivalent chromium an impurity to hexavalent chromium chronic acid.
- Environmental Health and Safety