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Use of Calcite for Defluoridation of Drinking Water in Acidic medium

Author Affiliations

  • 1 Department of Chemical Engineering, Malaviya National Institute of Technology Jaipur, Rajasthan, INDIA

Res.J.chem.sci., Volume 4, Issue (6), Pages 62-65, June,18 (2014)


A higher level of fluoride in drinking water poses serious health hazards to humans. Fluoride accumulates in bones and teeth in the form of fluorapatite which causes the bones to become brittle. Oral intake of fluoride higher than 1.0 to 1.5mg/L results in skeletal and dental fluorosis. Batch experiments were carried out to investigate the removal of fluoride from acid treated water by using calcite as the adsorbent. The effect of calcite dosage with different concentrations of acetic acid on defluoridation capacity was evaluated. The removal efficiency of fluoride increased with increase in the dose of calcite. Calcite is found to be a very low cost material and treating it with 0.05M acetic acid has resulted in increasing the defluoridation capacity to 75.6%. For a dosage of 7gm/l of calcite used for treating water with acetic acid the removal was 65.03% and the pH of treated water was observed to be 6.7 to 7.4 which makes it fit for drinking purposes. Results obtained depicted that the defluoridation is due to both adsorption and precipitation processes. It was found that the acidified water was neutralized by calcite and the pH of treated water was in the range of 6.7 to 7.4 after treatment. This study indicated that calcite is a very low cost adsorbent and can be used as a defluoridation agent.


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