Evaluating arsenic and manganese removal from water by chlorine oxidation followed by clarification.
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2015
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This paper investigates the simultaneous removal of arsenic [As(V) or As(III)] and manganese [Mn(II)] from natural waters of low and high turbidity by clarification (with polyaluminum chloride and aluminum sulfate as primary coagulants) associated or not with chlorine pre-oxidation. The results showed that the clarification process exhibited low Mn(II) removal, that varied from 6% to 18% and from 19% to 27% for natural waters of low and high turbidity, respectively. The use of chlorine as pre-oxidant increased Mn(II) removal up to 77% and was associated with the formation of birnessite. Regarding As(V) removal by clarification, particularly for high turbidity water, a concentration lower than that established by the National Drinking Water Quality Standards (10 μg.L-1) was achieved in almost all tests. Oxidation preceding the clarification led to AsIII removal efficiencies from 80% to 90% for both coagulants and types of water
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Arsenic, Manganese, Clarification, Oxidation, Water treatment
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PIRES, V. G. R. et al. Evaluating arsenic and manganese removal from water by chlorine oxidation followed by clarification. Brazilian Journal of Chemical Engineering, v. 32, n. 2, p. 409-419, 2015. Disponível em: <http://www.scielo.br/pdf/bjce/v32n2/0104-6632-bjce-32-2-0409.pdf>. Acesso em: 21 out. 2015.