International Journal of Science, Technology and Society
Volume 4, Issue 1, January 2016, Pages: 1-6
Received: Jan. 1, 2016;
Accepted: Jan. 11, 2016;
Published: Jan. 25, 2016
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Francisco Lucas Olambo, Tanzania Industrial Research and Development Organization, Dar es Salaam, Tanzania
Joseph Yoeza Naimani Philip, Chemistry Department, University of Dar es Salaam, Dar es Salaam, Tanzania
James Epiphan Gabriel Mdoe, Chemistry Department, University of Dar es Salaam, Dar es Salaam, Tanzania
In some parts of Tanzania, fluoride ion concentrations in potable water are higher than recommended by WHO. Consequently, searches for economically and technically viable strategies are required to address this problem. This work aims to determine the potential of phosphate rock mined from Minjingu area in Northern Tanzania as water de-fluoridatant. The results obtained are reported herein. The rock particles were chemically activated and then characterised by XRF, XRD and nitrogen physisorption. Results showed that the main component of chemically activated rock particles was calcium hydroxyapatite with Ca/P ratio of 1.55 whereas the main component of non-activated particles was calcium fluoroapatite (Ca/P ratio of 1.66). The results also indicated that activated rock material was mesoporous with a BET surface area of 57.4 m2/g. Results for water defluoridation showed that the material had a fluoride ion percentage removal of about 90%, when the adsorbent dose was 8 g, contact time of 30 minutes, initial fluoride ion concentration 5 mg/L, pH values of 6.0 to 7.2 and batch volume of 50 mL. The material could be regenerated using 1% NaOH and reused in the water defluoridation process. Therefore, Minjingu Phosphate Rock (MPR) is potential water de-fluoridatant.
Francisco Lucas Olambo,
Joseph Yoeza Naimani Philip,
James Epiphan Gabriel Mdoe,
The Potential of Minjingu Phosphate Rock for Water Defluoridation, International Journal of Science, Technology and Society.
Vol. 4, No. 1,
2016, pp. 1-6.
Copyright © 2016 Authors retain the copyright of this article.
This article is an open access article distributed under the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/
) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Kashaigili J. J. (2010) Assessment of Groundwater Availability and its Current and Potential Use Impacts in Tanzania. Final Report Prepared for the International Water Management Institute, pp 1–58.
Roy S. and Dass G. (2013) Fluorine Contamination in Drinking Water. Resour. Environ. 3: 53-58.
Tiemann M. (2013) Fluoride in Drinking Water: A Review of Fluoridation and Regulations Issues: Report for Congress Congressional Research Services, pp 1–21.
WHO (2004) Fluoride in Drinking-water. Background Document for Development of WHO Guidelines for Drinking-water Quality. World Health Organization: Geneva, pp. 1–7.
WHO (1994) Fluorides and Oral Health. Report of a WHO Expert Committee on Oral Health Status and Fluoride Use. WHO Technical Report Series 846. WHO, Geneva, pp 1–34.
Ghiglieri G., Balia R., Ogiano G., and Pittalis D. (2010) Prospecting for Safe (low fluoride) Groundwater in the Eastern African Rift Valley: the Arumeru District Northern Tanzania. Hydrol. Earth. Syst. Sci. 14: 1081–1091.
Fawell J., Bailey K., Chilton J., Dahi E., Fewtrell L. and Magara Y. (2006) Fluoride in Drinking Water, World Health Organization. IWA Publishing, London, pp 1–134.
Gumbo F. J. and Mkongo G. (1995) Defluoridation for Rural Fluoride Affected Communities in Tanzania. Proceedings of the 1st international workshop on fluorosis and defluoridation of water, Ngurdoto, Tanzania, pp 109–114.
Feenstra L., Vasak L. and Griffioen J. (2007) Fluoride in Groundwater. Overview and Evaluation of Removal Methods, Report SP 2007-1. International Groundwater Resource Assessment Centre, Utrecht, Netherland, pp 1–21.
Thole B. (2013) Ground Water Contamination with Fluoride and Potential Fluoride Removal Technologies for East and Southern Africa; Perspectives in Water Pollution, Ahmad I (Ed.), pp 65–91.
Bjorvatn K. and Bårdsen A. (1995) Use of Activated Clay for Defluoridation of Water. Proceedings of the 1st International Workshop on Fluorosis and Defluoridation of Water, Ngurdoto, Tanzania, pp 49–55.
Meenekshi and Maheshwari R. C. (2006) Fluoride in Drinking Water and its Removal, J. Hazard. Mater, pp 456–463.
Kaseva E. M. (2006) Optimization of Regenerated Bone Char for Fluoride Removal in Drinking Water: A Case Study in Tanzania: J. Water Health, pp 139–147.
Dahi E., Mtalo F., Njau B. and Bregnhj H. (1996) Defluoridation Using the Nalgonda Technique in Tanzania. Proceedings of the 2nd WEDC Conference, New Delhi, pp 266–268.
Renuka, P. and Pushpanjal, K. (2013) Review on Defluoridation Technologies of Water. Int. J. Eng. Sci. 2: 86–94.
Mumtaz, N., Pandey, G. and Labhasetwar, P. K. (2014) Assessment of electrolytic process for water defluoridation. Int. J. Environ. Res. Public Health, pp 175-182.
Khairnar M. R., Dodamani, A. S., Jadhav, H. C., Naik, R. G. and Deshmukh, M. A. (2015) Mitigation of Fluorosis - A Review. J. Clin. Diagn. Res. pp 5-9.