Browsing by Author "Pereira, Jomara G."

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    Coagulação/floculação de suspensões ricas em óxidos de ferro por sulfato de alumínio.
    (2004) Guedes, Claudia Dumans; Pereira, Jomara G.; Lena, Jorge Carvalho de; Paiva, José Fernando de; Lima, Rosa Malena Fernandes
    The destabilization mechanism of suspensions of positively charged iron oxide particles by aluminum sulphate was investigated, aiming to evaluate the efficiency of the latter as a coagulant for natural surface waters from iron ore mining plants. Synthetic water s that simulate natural suspensions were used. The best coagulant dosage was found to be 100 mg/L at pH 4. The specific adsorption of hydrolysis products of aluminum salts on iron oxide particles and heterocoagulation processes involving differently charged substrates are proposed to explain the turbidity reduction of the suspensions.