Defluoridation of Groundwater Using Raw Bauxite: Kinetics and Thermodynamics

Chikumbusho Kayira, Samson Sajidu, Wellington Masamba, Jonas Mwatseteza

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

High concentration of fluoride in drinking water causes dental and skeletal fluorosis, a slow, progressive and incurable disease. Removal of fluoride from water (defluoridation) offers a viable remedy to high fluoride content in water and fluorosis where other domestic water treatment solutions are not practicable. Conventional defluoridation technologies are either inefficient or require significant financial and technological investment. Therefore studies in developing countries have focused on local defluoridating agents for abating high fluorides and fluorosis. This study therefore investigated the efficiency of using raw bauxite in defluoridating groundwater through batch equilibrium studies. The bauxite exhibited defluoridation efficiency of up to 96.1% for groundwater with a fluoride concentration of 6.17mg/L at a bauxite dosage of 0.120kg/L. High fluoride uptake capacity of up to 275mg/kg was obtained for the raw bauxite. Gibbsite which is the main constituent of the raw bauxite was responsible for the fluoride removal. The intraparticle diffusion model revealed that fluoride sorption by the raw bauxite occurred through both surface complexation and penetrative diffusion. Ion exchange resulting in the precipitation of insoluble AlF3 might add to the fluoride removal. Fluoride sorption was spontaneous and showed first order kinetics. The activation energy and enthalpy of reaction were determined as 19.6 and 126.5kJ/mol, respectively.
Original languageEnglish
Pages (from-to)546-551
Number of pages6
JournalClean-Soil Air Water
Volume42
Issue number5
DOIs
Publication statusPublished - 2014

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bauxite
fluoride
thermodynamics
kinetics
groundwater
sorption
gibbsite
enthalpy
complexation
activation energy
ion exchange
water treatment
developing world
drinking water
water

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Kayira, Chikumbusho ; Sajidu, Samson ; Masamba, Wellington ; Mwatseteza, Jonas. / Defluoridation of Groundwater Using Raw Bauxite: Kinetics and Thermodynamics. In: Clean-Soil Air Water. 2014 ; Vol. 42, No. 5. pp. 546-551.
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abstract = "High concentration of fluoride in drinking water causes dental and skeletal fluorosis, a slow, progressive and incurable disease. Removal of fluoride from water (defluoridation) offers a viable remedy to high fluoride content in water and fluorosis where other domestic water treatment solutions are not practicable. Conventional defluoridation technologies are either inefficient or require significant financial and technological investment. Therefore studies in developing countries have focused on local defluoridating agents for abating high fluorides and fluorosis. This study therefore investigated the efficiency of using raw bauxite in defluoridating groundwater through batch equilibrium studies. The bauxite exhibited defluoridation efficiency of up to 96.1{\%} for groundwater with a fluoride concentration of 6.17mg/L at a bauxite dosage of 0.120kg/L. High fluoride uptake capacity of up to 275mg/kg was obtained for the raw bauxite. Gibbsite which is the main constituent of the raw bauxite was responsible for the fluoride removal. The intraparticle diffusion model revealed that fluoride sorption by the raw bauxite occurred through both surface complexation and penetrative diffusion. Ion exchange resulting in the precipitation of insoluble AlF3 might add to the fluoride removal. Fluoride sorption was spontaneous and showed first order kinetics. The activation energy and enthalpy of reaction were determined as 19.6 and 126.5kJ/mol, respectively.",
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Defluoridation of Groundwater Using Raw Bauxite: Kinetics and Thermodynamics. / Kayira, Chikumbusho; Sajidu, Samson; Masamba, Wellington; Mwatseteza, Jonas.

In: Clean-Soil Air Water, Vol. 42, No. 5, 2014, p. 546-551.

Research output: Contribution to journalArticle

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AU - Sajidu, Samson

AU - Masamba, Wellington

AU - Mwatseteza, Jonas

PY - 2014

Y1 - 2014

N2 - High concentration of fluoride in drinking water causes dental and skeletal fluorosis, a slow, progressive and incurable disease. Removal of fluoride from water (defluoridation) offers a viable remedy to high fluoride content in water and fluorosis where other domestic water treatment solutions are not practicable. Conventional defluoridation technologies are either inefficient or require significant financial and technological investment. Therefore studies in developing countries have focused on local defluoridating agents for abating high fluorides and fluorosis. This study therefore investigated the efficiency of using raw bauxite in defluoridating groundwater through batch equilibrium studies. The bauxite exhibited defluoridation efficiency of up to 96.1% for groundwater with a fluoride concentration of 6.17mg/L at a bauxite dosage of 0.120kg/L. High fluoride uptake capacity of up to 275mg/kg was obtained for the raw bauxite. Gibbsite which is the main constituent of the raw bauxite was responsible for the fluoride removal. The intraparticle diffusion model revealed that fluoride sorption by the raw bauxite occurred through both surface complexation and penetrative diffusion. Ion exchange resulting in the precipitation of insoluble AlF3 might add to the fluoride removal. Fluoride sorption was spontaneous and showed first order kinetics. The activation energy and enthalpy of reaction were determined as 19.6 and 126.5kJ/mol, respectively.

AB - High concentration of fluoride in drinking water causes dental and skeletal fluorosis, a slow, progressive and incurable disease. Removal of fluoride from water (defluoridation) offers a viable remedy to high fluoride content in water and fluorosis where other domestic water treatment solutions are not practicable. Conventional defluoridation technologies are either inefficient or require significant financial and technological investment. Therefore studies in developing countries have focused on local defluoridating agents for abating high fluorides and fluorosis. This study therefore investigated the efficiency of using raw bauxite in defluoridating groundwater through batch equilibrium studies. The bauxite exhibited defluoridation efficiency of up to 96.1% for groundwater with a fluoride concentration of 6.17mg/L at a bauxite dosage of 0.120kg/L. High fluoride uptake capacity of up to 275mg/kg was obtained for the raw bauxite. Gibbsite which is the main constituent of the raw bauxite was responsible for the fluoride removal. The intraparticle diffusion model revealed that fluoride sorption by the raw bauxite occurred through both surface complexation and penetrative diffusion. Ion exchange resulting in the precipitation of insoluble AlF3 might add to the fluoride removal. Fluoride sorption was spontaneous and showed first order kinetics. The activation energy and enthalpy of reaction were determined as 19.6 and 126.5kJ/mol, respectively.

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