ORIGINAL RESEARCH
Recovery of Chromium from Sludge
Formed after Neutralisation of Chromic
Wastewater
I. Bojanowska
Department of Environmental Engineering, Faculty of Chemistry, University of Gdańsk,
18 J. Sobieskiego St., 80-952 Gdańsk, Poland
18 J. Sobieskiego St., 80-952 Gdańsk, Poland
Pol. J. Environ. Stud. 2002;11(2):117–121
KEYWORDS
ABSTRACT
This paper describes chromium recovery from sludge generated while neutralising chromic wastewater.
Chromium(III) hydroxide is the main component of these sludges. The recovery method is based on the
transformation of chromium(III) hydroxide to chromium(VI) and was developed in our department. The
method includes precipitation of the chromium(III) hydroxide and its dissolution, oxidation of chromium(
III) to chromium(VI), solvent extraction and reextraction of chromium(VI). The chromium recovery
yield of each procedure stage was in the range of 92 to 99%. Overall chromium recovery yield was about
90%.
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