International E-publication: Publish Projects, Dissertation, Theses, Books, Souvenir, Conference Proceeding with ISBN.  International E-Bulletin: Information/News regarding: Academics and Research

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)

Abstract

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.

References

  1. World Health Organization, Guidelines for drinking water quality, 3rd Edition, WHO, Geneva, (2004)
  2. Aoba T. and Fejerskov O., Dental fluorosis: chemistry and biology, Crit. Rev. Oral. Biol. Med.,13(2), 155-170(2002)
  3. Teotia M., Teotia S. P. S. and Kunwar K. B., Endemic skeletal fluorosis, Arch. Dis. Child., 46(249), 686-691(1971)
  4. Sharma J. D., Sohu D. and Jain P., Prevalence of neurological manifestations in a human population exposed to fluoride in drinking water, Fluoride,42(2), 127-132(2009)
  5. Sehn. P., Fluoride removal with extra low energy reverse osmosis membranes: three years of large scale field experience in Finland, Desalination,223(1), 73-84(2007)
  6. Tahaikt M., El Habbani R., Ait Haddou A., Achary I., Amor Z., Taky M., and Elmidaoui A., Fluoride removal from groundwater by nanofiltration. Desalination, 212(1),46-53(2007)
  7. Thavamani S. S. and Rajkumar R. Removal of Cr(VI), Cu(II), Pb(II) and Ni(II) from Aqueous Solutions by Adsorption on Alumina, Res. J. Chem. Sci . 3(8), 44-48(2013)
  8. Al-Mamun M., Poostforush M., Mukul S.A. and Subhan M.A. Comparison studies of Adsorption Properties on Ni(II) Removal by Strong and Weak acid Cation-exchange Resins, Res. J. Chem. Sci . 3(3), 34-41(2013)
  9. Karthika C and Sekar M. Comparison studies of Adsorption Properties on Ni(II) Removal by Strong and Weak acid Cation-exchange Resins, Res. J. Chem. Sci .,3(3), 65-69(2013)
  10. Tang Y., Guan X., Su T., Gao N. and Wang J., Fluoride adsorption onto activated alumina: Modeling the effects of pH and some competing ions. Colloids. Surf A., 337(1), 33-38,(2009)
  11. George, S., Pandit, P., and Gupta, A. B., Residual aluminium in water defluoridated using activated alumina adsorption–Modeling and simulation studies, Water Res., 44(10), 3055-3064(2010)
  12. Malay D.K, and Salim A.J., Comparative Study of Batch Adsorption of Fluoride Using Commercial and Natural Adsorbent, Res. J. Chem. Sci . 1(7), 68-75 (2011)
  13. Tor A., Removal of fluoride from an aqueous solution by using montmorillonite. Desalination, 201(1),267–276,(2006)
  14. Asgari G., Roshani, B., Ghanizadeh, G. The investigation of kinetic and isotherm of fluoride adsorption onto functionalize pumice stone, J. Hazard. Mater., 217,123-132(2012)
  15. Dwivedi S., Mondal P. and Balomajumder C., Removal of Fluoride using Citrus limetta in batch Reactor: Kinetics and Equilibrium Studies, Res. J. Chem. Sci . 4(1), 50-58(2014)
  16. Kumar S., Gupta A., and Yadav J. P., Fluoride removal by mixtures of activated carbon prepared from Neem(Azadirachta indica) and Kikar(Acacia arabica) leaves. Indian, J. Chem. Technol., 14(4), 355-361(2007)
  17. Ma W., Ya F., Wang R., and Zhao Y. Fluoride removal from drinking water by adsorption using bone char as a biosorbent, Int. J. of Environ. Technol. and Manag., 9(1),59-69(2008)
  18. George S., Pandit P., Gupta A.B. and Agarwal M., Modeling and Simulation studies for Aluminium-Fluoride Interactions in Nalgonda Defluoridation Process, Chem. Prod. and Process. Model., 4(1),(2009)
  19. Turner B.D. Binning P., Stipp S.L.S., Fluoride removal by calcite: evidence for fluorite precipitation and surface adsorption, Environ. Sci. Technol., 39(24) , 9561–9568, (2005)
  20. Islam M. and Patel R.K., Evaluation of removal efficiency of fluoride from aqueous solution using quick lime, J. Hazard. Mater., 143(1) ,303–310, (2007)
  21. Jain S. and Jayaram R.V. Removal of fluoride from contaminated drinking water using unmodified and aluminium hydroxide impregnated blue lime stone waste, Sep. Sci. Technol., 44(6) ,1436–1451, (2009)