Removal of cadmium in leachate from waste alumina beads using electrochemical technology

Document Type

Article

Publication Date

12-1-2002

Abstract

US Air Force uses alumina beads (aluminum oxide) as a blast media in routine maintenance operations. These spent alumina beads fail to pass the TCLP test for their cadmium contents. A chemical process consisting of leaching and electrochemical methods is investigated for the feasibility of treating the alumina beads. Dilute nitric acid was found the most effective solution for cadmium leaching. Electrochemical reduction was able to reduce cadmium content in the leachate from 180 mg/L to 15 mg/L. With consumable aluminum electrodes, electrochemical coagulation reduced the cadmium concentration to less than 1 mg/L. Electroflotation was effective for metal sludge, ferric, aluminum, and ferrous hydroxide separations with the assistance of commercial surfactants.

Identifier

0142058759 (Scopus)

Publication Title

Chemical Engineering Communications

External Full Text Location

https://doi.org/10.1080/00986440212476

ISSN

00986445

First Page

827

Last Page

848

Issue

6

Volume

189

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