Abstract
Polymeric aluminum ferric sulfate (PAFS) was a novel inorganic composite coagulant, prepared by direct oxidation process using aluminum oxide (Al2O3) and ferrous sulfate heptahydrate (FeSO4⋅7H2O) as typical materials. In order to obtain the optimal removal rate of the turbidity and humic acid, the optimum preparation conditions of PAFS was investigated as follows: SO4 2-/Fe, NO3 −/Fe, PO4 3-/Fe, Al/Fe molar ratio and reaction temperature. The resultant polymer was characterized by scanning electron microscopytrans (SEM). The results showed that the optimum preparation conditions were SO42-/Fe of 0.35, Al/Fe of 0.11, NO3 −/Fe of 0.45, PO4 3-/Fe of 0.09 and reaction temperature of 80°C, and the maximum turbidity and HA removal efficiency could reach 98.4%, 93.5%, respectively.
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