Abstract
The occurrence of fluoride in groundwater has been reported in many countries, mainly because the excess fluoride in drinking water can lead to dental or skeletal fluorosis. Fluoride removal by coagulation with Moringa oleifera seeds, followed by separation with membranes, was investigated in this work. Artificially fluoridated water, at a starting fluoride concentration of 10 mg L−1, was submitted to a coagulation process with aqueous extracts of M. oleifera seeds. The coagulation process was followed by ultrafiltration with membranes at different pressures. The coagulation process with 2.5 g L−1 of M. oleifera promoted a reduction of 90.90 % in the fluoride content of the treated water, making it possible for poor communities to consume this water. It is noteworthy that the combined coagulation/filtration process using raw coagulant showed the highest values of colour and turbidity, which, however, were still below the limits set for drinking water by Brazilian legislation. The advantage of proposing a sequential process using membrane separation is that it removes colour and turbidity, caused by the use of M. oleifera as a coagulant, resulting in water that meets potability standards.
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The authors would like to thank the State University of Maringá and National Council for Scientific and Technological Development (CNPq) for the research support.
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dos Santos Bazanella, G.C., da Silva, G.F., Vieira, A.M.S. et al. Fluoride Removal from Water Using Combined Moringa oleifera/Ultrafiltration Process. Water Air Soil Pollut 223, 6083–6093 (2012). https://doi.org/10.1007/s11270-012-1342-y
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DOI: https://doi.org/10.1007/s11270-012-1342-y