Hexavalent Chromium, Chromate Conversion, Chromic Acid Anodizing

Aerospace component manufacturers use hexavalent chromium (Cr⁺⁶) conversion coating for corrosion inhibition on aluminum structures and components. Evoqua supplies services and equipment to supply high purity deionized (DI) water for rinse water and process bath makeup for this process. Rinsewaters from hexavalent chromium conversion coating require treatment and the treatment residuals (ion exchange media or sludge) are regulated as RCRA hazardous waste (D007, F019).

Evoqua’s wastewater ion exchange systems and capital equipment are used to remove the hazardous components, allowing the treated rinse water to either be recycled back to the rinse baths or discharged to the POTW. The contaminant-laden ion exchange media is shipped back to Evoqua’s owned and operated RCRA treatment facility for compliant processing which epitomizes the “cradle to grave” waste treatment approach.