Review of fluoride removal from drinking water

Mohapatra, Mamata; Anand, S.; Mishra, B.K.; Giles, Dion E.; Singh, Pritam

doi:10.1016/j.jenvman.2009.08.015

Cited by 734 publications

(371 citation statements)

References 120 publications

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“…Ayoob et al (2008) assessed the conceptual overview on sustainability of different defluoridation technologies and indicated that despite the fact that membrane and electrochemical techniques have high capacity of fluoride removal they are not widely used because they are costly and energy intensive. Adsorption is considered an appropriate technique for small community water source defluoridation compared to other techniques (Mohapatra et al 2009). As a result, adsorption is frequently used as a robust technique to remove water soluble ions and an attractive method for the removal of fluoride in terms of low cost, simplicity of design, and operation (Tchomgui-Kamga et al 2010a;Miretzky and Cirelli 2011).…”

Section: Introductionmentioning

confidence: 99%

Experimental evaluation of sorptive removal of fluoride from drinking water using iron ore

et al. 2014

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High concentrations of fluoride in drinking water is a public health concern globally and of critical importance in the Rift Valley region. As a low-cost water treatment option, the defluoridation capacity of locally available iron ore was investigated. Residence time, pH, agitation rate, particle size of the adsorbent, sorbent dose, initial fluoride concentration and the effect of co-existing anions were assessed. The sorption kinetics was found to follow pseudo-first-order rate and the experimental equilibrium sorption data fitted reasonably well to the Freundlich model. The sorption capacity of iron ore for fluoride was 1.72 mg/g and the equilibrium was attained after 120 min at the optimum pH of 6. The sorption study was also carried out at natural pH conditions using natural ground water samples and the fluoride level was reduced from 14.22 to 1.17 mg/L (below the WHO maximum permissible limit). Overall, we concluded that iron ore can be used in water treatment for fluoride removal in the Rift Valley region and beyond.

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Section: Introductionmentioning

confidence: 99%

Experimental evaluation of sorptive removal of fluoride from drinking water using iron ore

et al. 2014

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“…Excess ingestion of fluoride with high concentration can induce mottling of teeth, softening of bones, even neurological damages [2]. So, fluorosis is an important public health problem all over the world, and an appropriate concentration of fluoride (0.5-1.5 mg/L) is required to prevent dental cavities [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

“…Among these methods, membrane and ion exchange processes are not very common due to its high installation and maintenance cost, while chemical precipitation results in relatively higher residual fluoride concentration in the effluents [5,7]. Adsorption process is a widely accepted technique because of its ease of operation and cost-effectiveness [3].…”

Section: Introductionmentioning

confidence: 99%

Enhanced fluoride adsorption using Al (III) modified calcium hydroxyapatite

Nie

Kong

2012

Journal of Hazardous Materials

182

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h i g h l i g h t sAl modified hydroxyapatite possessed a higher defluoridation capacity of 32.57 mg/g. Hydroxyl groups on the surface of Al-HAP was the adsorption sites for F − removal. Enhanced F − removal over Al-HAP was attributed to the modification with aluminum.a r t i c l e i n f o a b s t r a c tAluminum-modified hydroxyapatite (Al-HAP) was prepared and characterized using XRD and BET analyses. Al-HAP possessed higher defluoridation capacity (DC) of 32.57 mgF − /g than unmodified hydroxyapatite (HAP) which showed a DC of 16.38 mgF − /g. The effect of Al/Ca atomic ratio in Al-HAP, solution pH and co-existing anions was further studied. The results indicated that the adsorption data could be well described by the Langmuir isotherm model and the adsorption kinetic followed the pseudo-second-order model. The pH changes during the adsorption process suggested that the OH on the surface of Al-HAP was the adsorption sites. The more adsorption sites were formed on Al modified HAP, which possessed abundant surface hydroxyl groups, resulting in higher efficiency of F − removal. Thermodynamic parameters such as G• , H • and S • were calculated in order to understand the nature of adsorption process. The results revealed that the adsorption reaction was a spontaneous and endothermic process.

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“…It is a problem not unique to Thailand, as many areas of Africa and Asia have similar issues with excessive fluoride consumption resulting in efforts to remove excessive fluoride from drinking water employing various techniques such as coagulation-precipitation, adsorption, ion-exchange and more recently nano-filtration [15-17]. The different techniques are associated with varying levels of effectiveness linked to logistical and financial considerations.…”

Section: Discussionmentioning

confidence: 99%

Dental fluorosis in populations from Chiang Mai, Thailand with different fluoride exposures – Paper 1: assessing fluorosis risk, predictors of fluorosis and the potential role of food preparation

McGrady

Ellwood²,

Srisilapanan

et al. 2012

BMC Oral Health

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BackgroundTo determine the severity of dental fluorosis in selected populations in Chiang Mai, Thailand with different exposures to fluoride and to explore possible risk indicators for dental fluorosis.MethodsSubjects were male and female lifetime residents aged 8–13 years. For each child the fluoride content of drinking and cooking water samples were assessed. Digital images were taken of the maxillary central incisors for later blind scoring for TF index (10% repeat scores). Interview data explored previous cooking and drinking water use, exposure to fluoride, infant feeding patterns and oral hygiene practices.ResultsData from 560 subjects were available for analysis (298 M, 262 F). A weighted kappa of 0.80 was obtained for repeat photographic scores. The prevalence of fluorosis (TF 3+) for subjects consuming drinking and cooking water with a fluoride concentration of <0.9 ppm was 10.2%. For subjects consuming drinking and cooking water >0.9 ppm F the prevalence of fluorosis (TF 3+) rose to 37.3%. Drinking and cooking water at age 3, water used for infant formula and water used for preparing infant food all demonstrated an increase in fluorosis severity with increase in water fluoride level (p < 0.001). The probability estimate for the presentation of aesthetically significant fluorosis was 0.53 for exposure to high fluoride drinking (≥0.9 ppm) and cooking water (≥1.6 ppm).ConclusionsThe consumption of drinking water with fluoride content >0.9 ppm and use of cooking water with fluoride content >1.6 ppm were associated with an increased risk of aesthetically significant dental fluorosis. Fluoride levels in the current drinking and cooking water sources were strongly correlated with fluorosis severity. Further work is needed to explore fluorosis risk in relation to total fluoride intake from all sources including food preparation.

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Review of fluoride removal from drinking water

Cited by 734 publications

References 120 publications

Experimental evaluation of sorptive removal of fluoride from drinking water using iron ore

Experimental evaluation of sorptive removal of fluoride from drinking water using iron ore

Enhanced fluoride adsorption using Al (III) modified calcium hydroxyapatite

Dental fluorosis in populations from Chiang Mai, Thailand with different fluoride exposures – Paper 1: assessing fluorosis risk, predictors of fluorosis and the potential role of food preparation

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