Faculty Publications


Reducing chromium air emissions without going broke

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Journal/Book/Conference Title

Proceedings of the AESF Annual Technical Conference

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Two experiments on chromium emission reduction have shown potential in reducing chromium emissions at lower costs. Although this did not meet the Environmental Protection Agency's proposed emission limit of 0.03 mg/dscm, data gathered at the laboratory bench top plating system and one in an industrial setting have indicated at least 55% reduction. Chromium emissions are a direct result of aerosol mist formation primarily due to hydrogen bubble generation at the cathode. Both experiments therefore focused either on the reduction of aerosol formation or elimination of chromium from exhaust air prior to atmospheric discharge. Aerosol source reduction technologies used in the experiments include fume suppressants, trivalent chromium processes, and polypropylene balls. Polypropylene balls act as impinger to break the bubbles and condense water and chromium prior to release in the environment. Because source reduction technologies do not involve installation and operation of large equipment, a low-cost emission control is achieved.

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