Effect of Particle Size on Loading Capacity and Water Quality in Water Defluoridation with 200°C Calcined Bauxite, Gypsum, Magnesite and their Composite Filter

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dc.contributor.authorThole, Bernard
dc.contributor.authorMtalo, Felix W.
dc.contributor.authorMasamba, W. R. L.
dc.date.accessioned2016-03-23T08:00:16Z
dc.date.available2016-03-23T08:00:16Z
dc.date.issued2012-01-12
dc.description.abstractDefluoridation was carried out with bauxite, gypsum, magnesite and their composite calcined at 200°C to determine relationship between particle size, capacity and water quality, in an attempt to formulate a composite filter in the ratio of loading capacities. Particles of 0.5 to 1.0, 1.0 to 1.4, 1.4 to 2.0 and 2.0 to 3.0 mm diameter were employed in batch defluoridation. Color, hardness, pH,   3 2 F ,Cl , Al ,Fe were determined hourly until fluoride equilibrium was obtained. Results showed that capacities were inversely correlated to particle size obtaining polynomial, linear and logarithmic relations of capacity (mg/g) to particle size (mm); Cs   Pz Pz 2 ( ) (composite, gypsum), Cs  Pz  (bauxite) and Cs   ln Pz  (magnesite). Bauxite, gypsum and composite decreased but magnesite increased pH. Particle size and pH changes were positively correlated, highly for bauxite (r2 = 0.915), fairly for composite and magnesite (r2 = 0.855 and 0.853, respectively) and lowly correlated for gypsum (r2 = 0.562). Smaller particles obtained higher apparent colour, hardness, alkalinity and sulphate. There was no relationship between particle size and  3 2 Cl , Al ,Fe . Sorption capacities of these materials increase with decrease in particle size, however decrease in particle size enhances colour, hardness and sulphate levels. In optimizing the materials for defluoridation particle size can be decreased while monitoring colour, hardness, alkalinity and sulphate levels. Particles of diameter 2 mm were optimum in the present experiments.en_US
dc.identifier.citationThole, B., Mtalo, F. and Masamba, W., 2012. Effect of particle size on loading capacity and water quality in water defluoridation with 200 C calcined bauxite, gypsum, magnesite and their composite filter. African Journal of Pure and Applied Chemistry, 6(2), pp.26-34.en_US
dc.identifier.doi10.5897/AJPAC11.037
dc.identifier.issn1996 - 0840
dc.identifier.urihttp://hdl.handle.net/123456789/1235
dc.language.isoenen_US
dc.publisherCollege of Engineering and Technology, University of Dar es Salaamen_US
dc.subjectBauxiteen_US
dc.subjectcompositeen_US
dc.subjectdefluoridationen_US
dc.subjectgypsumen_US
dc.subjectmagnesiteen_US
dc.titleEffect of Particle Size on Loading Capacity and Water Quality in Water Defluoridation with 200°C Calcined Bauxite, Gypsum, Magnesite and their Composite Filteren_US
dc.typeJournal Article, Peer Revieweden_US
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