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Preliminary Assessment Of Low Cost Local Sorbent Materials For Water Defluoridation In Keren, Eritrea

Congress: 2015
Author(s): Beraki Mehari (Keren, Eritrea), Letensie Hadgu, Alfred Mayabi
Eritrean Institute of Technology1, Jomo Kenyatta University of Agriculture and Technology2

Keyword(s): Sub-theme 1: Water supply and demand,
AbstractWater in some parts of Eritrea has fluoride level above WHO guideline of 1.5 mg/L. One of the communities in Eritrea exposed to high fluoride in water is Keren community and as a result, they suffer dental and skeletal fluorosis. Fluoride sorbent local materials named crushed burnt clay pot, household ash, Keren and Adigerghish soil were studied in a batch defluoridation. The effect of amount of adsorbent, pH, contact time, particle size and fluoride concentration were examined. The pH of water played a major role and at pH 7, crushed burnt clay pot, Keren and Adigerghish soil performed at optimum but optimum pH for household ash was 4. However, contact time was similar and the equilibrium time was 120 minute. Particle size had no significant effect in case of crushed burnt clay pot, however, in the other three materials, fine particles performed better than coarse particles. In all adsorbents studied, similar increasing trend in adsorption were observed when fluoride concentration was increased. Fluoride adsorption comparisons were made and the study revealed that crushed burnt clay pot has superior capacity than the others. Its average fluoride removal capacity was about 0.26 mg fluoride/g medium. Others ranged from 0.08-0.1 mg/g for the same mass of 7 g and thus crushed burnt clay pot was selected for defluoridation. [1] SE. Manahan. Environmental chemistry. Lewis publishers, 6th ed., USA, 1994. [2] UNICEF, UNICEF’s Position on Fluoridation, A UNICEF Publication on Water, Environment, Sanitation and Hygiene, Issue 13, 1999. [3] A. F. Tekle-Haimanot, B. Bushera and Y. Mekonnen. “Fluoride Levels in Water and Emdemic Fluorosis in Ethiopian Rift Valley”,In Proceedings of the 1st International Workshop on Fluorosis Prevention and Defluoridation of Water, Ngurdoto, Tanzania, The International Society for Fluoride Research. Ethiopian rift, 1995. [4] C. 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