Fluoride in drinking water and its removal

Meenakshi, Meenakshi; Maheshwari, R. C.

doi:10.1016/j.jhazmat.2006.02.024

Cited by 789 publications

(308 citation statements)

References 31 publications

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“…Groundwater forms a major source of drinking water in urban as well as rural areas. According to previous researchers, excessive fluoride concentrations have been reported in groundwater in more than 20 developed and developing countries including India where 19 states are facing acute fluoride problems (Meenakshi and Maheshwari 2006). In West Bengal, major part of Birbhum, Bankura, Purulia,and part of Burdwan, are intensly affected by fluoride (Hernández-Montoyaa et al 2012).…”

Section: Introductionmentioning

confidence: 99%

Optimizing adsorption of fluoride from water by modified banana peel dust using response surface modelling approach

Bhaumik

Mondal

2014

Appl Water Sci

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The present work highlighted the effective application of banana peel dust (BPD) for removal of fluoride (F -) from aqueous solution. The effects of operating parameters such as pH, initial concentration, adsorbent dose, contact time, agitation speed and temperature were analysed using response surface methodology. The significance of independent variables and their interactions were tested by the analysis of variance and t test statistics. Experimental results revealed that BPD has higher Fadsorption capacity (17.43, 26.31 and 39.5 mg/g). Fluoride adsorption kinetics followed pseudo-second-order model with high correlation of coefficient value (0.998). On the other hand, thermodynamic data suggest that adsorption is favoured at lower temperature, exothermic in nature and enthalpy driven. The adsorbents were characterised through scanning electron microscope, Fourier transform infrared spectroscopy and point of zero charges (pH ZPC ) ranges from pH 6.2-8.2. Finally, error analysis clearly demonstrates that all three adsorbents are well fitted with Langmuir isotherm compared to the other isotherm models. The reusable properties of the material support further development for commercial application purpose.

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Section: Introductionmentioning

confidence: 99%

Optimizing adsorption of fluoride from water by modified banana peel dust using response surface modelling approach

Bhaumik

Mondal

2014

Appl Water Sci

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“…Available techniques for the removal of fluoride belong to the following major categories: chemical precipitation [7,8], membrane processes [9], adsorption by activated alumina [10,11] ion exchange [12] and Nalgonda technique [13]. Nalgonda technique is also widely used in India because of its simplicity and cost effectiveness.…”

Section: Introductionmentioning

confidence: 99%

Fluoride removal by adsorption on thermally treated lateritic soils

Gomoro¹,

Zewge²,

Hundhammer³

et al. 2012

Bull. Chem. Soc. Eth.

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ABSTRACT. The ability of lateritic soils to remove fluoride from water has been studied. Important issues considered in the study include the relation between the mineral composition of soils and their ability to remove fluoride, the effect of thermal treatment of the soil on fluoride removal; the predominant fluoride containing species remain in the treated water and the possible mechanism of fluoride removal by lateritic soils. The fluoride removal capacity of thermally treated lateritic soils used in this study is in the range of 22 to 47 mmol/kg. The maximum capacity of 47 mmol/kg was obtained for RGS fired at 500 o C. The results obtained indicate that there is strong correlation between fluoride removal capacity and gibbsite content of the soil. From this it can be concluded that gibbsite is the active component in lateritic soils that strongly influence the fluoride removal capability. Speciation analysis reveals that at low initial fluoride concentrations the dissolution of gibbsite is facilitated by the adsorption of fluoride onto gibbsite. This may result in the formation of aluminum fluoro complexes in water.

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“…The use of cheaper alternative methods of defluoridation such as the Nalgonda Technique (popular in parts of India) utilizing alumina, lime and bleach to coagulate and precipitate fluoride from the water supply may not a viable option in this region of Thailand as the sludge produced becomes a waste substance that is difficult to manage. There are also questions regarding the efficacy and sustainability of this technique [16]. …”

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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Fluoride in drinking water and its removal

Cited by 789 publications

References 31 publications

Optimizing adsorption of fluoride from water by modified banana peel dust using response surface modelling approach

Optimizing adsorption of fluoride from water by modified banana peel dust using response surface modelling approach

Fluoride removal by adsorption on thermally treated lateritic soils

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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