As(III) removal from aqueous solutions using non-stoichiometric coprecipitation with iron(III) sulphate and filtration or flotation.
A study of As(III) removal from aqueous solutions was carried out, using iron (III) sulphate as a coprecipitation agent. When the initial As(III) concentration was 3775 mg l(-1), maximum As(III) removal was achieved at pH 9 and with a molar ratio of Fe(III)/As(III) equal to 11. Under these conditions the formed precipitates showed highest stability, relative to the fixation of As(III). Flotation, which can be applied as a subsequent solid/liquid separation method, was found to be particularly effective for solutions containing low As(III) concentrations (</= 10 mg(-1)).
Nenov
V
V
Department of Water Technology, University of Chemical Technology, BG-Burgas 8010, Bulgaria.
Zouboulis
A I
AI
Dimitrova
N
N
Dobrevsky
I
I