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Defluoridation of groundwater using diatomaceous earth : optimization of adsorption conditions, kinetics and leached metals risk assessment

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dc.contributor.author Izuagie, Anthony A.
dc.contributor.author Gitari, Wilson M.
dc.contributor.author Gumbo, Jabulani R.
dc.date.accessioned 2016-08-19T13:20:25Z
dc.date.available 2016-08-19T13:20:25Z
dc.date.issued 2015-08-27
dc.identifier.citation To cite this article: Anthony A. Izuagie, Wilson M. Gitari & Jabulani R. Gumbo (2015): Defluoridation of groundwater using diatomaceous earth: optimization of adsorption conditions, kinetics and leached metals risk assessment, Desalination and Water Treatment, DOI: 10.1080/19443994.2015.1083894 en_US
dc.identifier.uri To link to this article: http://dx.doi.org/10.1080/19443994.2015.1083894
dc.identifier.uri http://hdl.handle.net/11602/634
dc.description The original article can be accessed at http://dx.doi.org/10.1080/19443994.2015.1083894 en_US
dc.description.abstract In Sub-Saharan Africa, many rural communities depend on boreholes as the most appropriate source of water supply. Sadly, water from some of the boreholes contains fluoride above the WHO guideline of 1.5 mg/L. Hence, defluoridation is necessary. The aim of this study is to investigate the fluoride uptake capacity of diatomaceous earth (DE), a natural resource at optimized conditions by batch method. X-ray fluorescence analysis showed that the major component is silica (83.1%), while Al2O3 is the main minor component. XRD shows it is an amorphous material. For 8 mg/L fluoride spiked water, the highest per cent fluoride removal at optimum adsorption conditions (contact time: 30 min, adsorbent dosage: 8 g/L, pH 2, temperature: 298 K and shaking speed: 200 rpm) was between 23.4 and 25.6%. PO3 4 in tested field water was observed to reduce the fluoride uptake capacity of fluoride. The sorption data fitted better into Freundlich isotherm than Langmuir isotherm. Fluoride sorption process was found to be a second-order kinetic. Inductively coupled plasma-mass spectrometer analysis of treated water revealed that metal and non-metal species were released at trace levels. Modification of DE would be necessary to enhance the fluoride adsorption capacity en_US
dc.language.iso en en_US
dc.publisher Taylor and Francis en_US
dc.subject Defluoridation en_US
dc.subject Optimization en_US
dc.subject Kinetics en_US
dc.subject Leached metals en_US
dc.subject Assessment en_US
dc.title Defluoridation of groundwater using diatomaceous earth : optimization of adsorption conditions, kinetics and leached metals risk assessment en_US
dc.type Article en_US


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