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Breakthrough Characteristics and Flow-Rate Interaction in Water Defluoridation with a Bauxite-Gypsum-Magnesite Composite Filter

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dc.creator Thole, Bernard
dc.creator Mtalo, Felix W.
dc.creator Masamba, W. R. L. 2016-03-23T08:17:49Z 2016-03-23T08:17:49Z 2012-11 2018-03-27T08:40:41Z 2018-03-27T08:40:41Z
dc.identifier Bernard Thole., Felix Mtalo., & Wellington Masamba., (2012). Breakthrough characteristics and flow-rate interaction in Water Defluoridation with a Bauxite Gypsum-Magnesite composite Filter. Proceedings of Regional Water Conference –Gaberone Botswana
dc.identifier 10.2316/P.2012.762-012
dc.description Full text can be accessed at
dc.description Water defluoridation in a fixed bed column may be optimized through choice of flow rate. This, however, affects breakthrough characteristics. In any fixed bed system an understanding of flow rate and breakthrough interactions is therefore important to guide choice of design velocity. Consequently interactions between flow rate and break through characteristics were determined in a fixed bed column in defluoridation with a composite filter of bauxite, gypsum and magnesite. This was an attempt to optimize defluoridation with the three materials. Lower flow rates obtained longer service times but higher residual concentrations of sulphates and chlorides. Higher flow rates registered lower residual sulphate and chloride concentrations but obtained lower service times. There were no significant differences in residual concentrations of aluminium, iron, calcium and magnesium among the different flow rate regimes. Adsorbent exhaustion rates and critical bed depths increased with increase in flow rates, indicating that lower flow rates offered better technical system performance. Critical bed depths ranged from 5.23 to 10.89 cm for flow rate range of 0.68 to 1.25 ml/s. Operating lines were polynomic with generic form δ = C1 t2 - C2 t + C3, where δ is adsorbent exhaustion rate and t is empty bed residence time. Choice of flow rates, in this system requires a balance between service-time optimisation and water quality.
dc.language en
dc.subject Adsorption
dc.subject bauxite
dc.subject defluoridation
dc.subject gypsum
dc.subject magnesite
dc.subject critical bed depth
dc.title Breakthrough Characteristics and Flow-Rate Interaction in Water Defluoridation with a Bauxite-Gypsum-Magnesite Composite Filter
dc.type Conference Proceedings

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