Fluoride contamination of groundwater, both anthropogenic and natural, is a major problem worldwide. In this study, fluoride removal by crushed limestone 99 pure calcite was investigated by batch studies and surface-sensitive techniques from solutions with fluoride concentra tions from 150 molL 3 mgL to 110 mM 2100 mgL.
This fluoride removal efficiency was higher than with the limestone reactor of Reardon and Wang by a further reduction of 1.19 mgL fluoride in total yet still lower than the predicted efficiency. One important reason of the lower fluoride removal efficiency than with prediction is that the citrate ions suppressed the precipitation of calcite.
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Jan 30, 2016018332The aim of this research work is to develop a novel cost effective strategy for fluoride removal, applicable to rural areas of developing countries. Most of the adsorbent based technologies for fluoride removal work at acidic pH which is not a feasible condition for application in rural areas. This study investigates the feasibility of three low-cost adsorbents calcium carbonate, activated.
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Jun 30, 2000018332A two-column limestone reactor has been designed to reduce fluoride concentrations from wastewaters to below the maximum contaminant level MCL limit of 4 mgL. The reactor functions by forcing calcite CaCO3 to dissolve and fluorite CaF2 to precipitate in the first column. The second column is not necessary to remove fluoride but is used to precipitate the calcite dissolved in the first.
Of the acid to water before treatment with crushed limestone lowers the F-concentration from its initial value of 10 mgL to below 2 mgL, which is much better compared to the fluoride removal by limestone filtration alone 14. The ability of the crushed limestone chips to remove F-increased with increasing the acid concentration.
Fluoride removal from water using crushed limestone. limestone lowers the F-concentration from its initial value of 10 mgL to below 2 mgL, which is much better compared to the fluoride removal by limestone filtration alone 14. The ability of the crushed limestone chips to remove F-increased with increasing the acid concentration.
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Pre-acidified fluoride water using two edible acids, viz., acetic acid AA and citric acid CA have been used for treatment by crushed limestone of diameter 3-4 mm to precipitate fluoride as.
Apr 01, 2015018332The cost of limestone is US 27 per metric ton. Taking the fluoride removal capacity of limestone as 1.01 mgg, the cost of limestone for fluoride removal from 0.526 mM to below 0.052 mM at 10 mM PA, has been estimated as US 0.00021L of treated water.
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