| Abstrakt: |
This present work proposes, firstly, to characterize the quality of the physicochemical water brackish groundwater aquifers of the Terminal Complex (TC) from the region of Eloued-souf and to take stock of an item particularly fluoride, and, secondly, to study the comparison of power defluorinated of adsorbent materials such as (activated alumina AA, sodium clay SC and hydroxyapatite HAP) against the groundwater in the region of Eloued-souf. For this, a sampling campaign over twenty (16) wells and consumer taps was undertaken. The results show that the groundwaters are characterized by very high fluoride content and excessive mineralization and they require in some cases, specific treatment before supply. The study of adsorption for different adsorbents revealed removal efficiencies fluoride by three fairly similar adsorbents, The maximum adsorption is achieved after 60 minutes with a percentage of 90%, 83.4% and 73.95 % and with an adsorbed fluoride content of 0.22 mg/L, 0.318 mg/L and 0.52 mg/L for AA, HAP and SC, respectively. The acidity of the medium significantly affects the removal fluoride. Results deducted from the adsorption isotherms also showed that the retention follows the Langmuir model. The adsorption tests by adsorbent materials show that the physicochemical characteristics of brackish water are changed after treatment the adsorption mechanism is an exchange between the OH" ions and fluoride ions. Three materials are proving to be effective adsorbents for the fluoride removal that could be developed into a viable technology to help reduce the salinity of the Saharan hyper-fluorinated waters. Finally, a comparison between the results obtained different adsorbents allowed us to conclude that the defluoridation by activated alumina is the process of choice for many waters of the region of Eloued-souf, because it looks like a very interesting and promising technique. [ABSTRACT FROM AUTHOR] |
