Solubilization of zinc oxide from filter dust with Penicillium simplicissimum: bioreactor leaching and stoichiometry

Filter dusts from metal-processing industries contain valuable metals which should be recycled. Some disadvantages of conventional recycling methods can be avoided by applying biohydrometallurgical methods. Leaching of zinc from zinc oxide contained in filter dust was possible in a bioreactor (stirr...

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Bibliographic Details
Published in:Environmental science & technology 1992-02, Vol.26 (2), p.340-346
Main Authors: Burgstaller, Wolfgang, Strasser, Hermann, Woebking, Hans, Schinner, Franz
Format: Article
Language:English
Subjects:
Biohydrometallurgy. Microbial leaching
Biological and medical sciences
Biotechnology
Filters
Fundamental and applied biological sciences. Psychology
Fungi
Industrial applications and implications. Economical aspects
Manufacturing
Penicillium simplicissimum
Recycling
Zinc
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Summary:Filter dusts from metal-processing industries contain valuable metals which should be recycled. Some disadvantages of conventional recycling methods can be avoided by applying biohydrometallurgical methods. Leaching of zinc from zinc oxide contained in filter dust was possible in a bioreactor (stirred tank reactor) especially constructed for this purpose. Zinc solutions of 0.41 M were obtained after 9 days of leaching. The zinc concentration was doubled compared to leaching experiments in shake-flask cultures. The solubilization of zinc oxide was caused by the action of protons originating from citric acid produced by the fungus.
ISSN:0013-936X
1520-5851
DOI:10.1021/es00026a015