Abstract
Arsenate oxyanions were removed from aqueous solutions by sorption onto synthetic goethite, which was applied as fine particulate suspension during laboratory experiments. The main parameters affecting this treatment process were investigated, namely the concentrations of goethite and of arsenic(V), contact time, temperature, solution pH values and ionic strength variations, and typical adsorption isotherms were calculated. The study of flocculation of goethite particulates in bench scale was subsequently carried out in presence of pentavalent arsenic (being a toxic pollutant), by applying an appropriate optical technique. The flocculation dynamics of dispersed goethite particles was examined, complemented by turbidity and electrophoretic mobility measurements.
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