Removal of Fluorides in Drinking Water by Aloe Vera and Calcium Chloride

Abstract

The occurrence of high fluoride in groundwater has drawn considerable attention in the world. The contamination of fluoride in groundwater has influenced by fluoride rich rocks, pH, cation and anion exchange capacity of aquifer materials, bicarbonates, evaporation and temperature etc. The aloe (Aloe barbadensis Miller) and calcium chloride has been used to precipitate out fluoride ions from drinking water. The effect of different parameters on precipitation and adsorption studies like pH, agitation time, adsorbent dose and fluoride concentration have been analysed. The equilibrium adsorption data was studied for Langmuir and Freundlich isotherms. (10 mg L -1 ) was prepared by diluting 100 mL stock solution to 1000 mL using de-ionized water. Further, 1.4, 1.2, 1.0, 0.8, 0.6, 0.4, 0.2 and 0.0 mg L -1 fluoride solution were prepared for calibration curve. The test fluoride solutions of different initial fluoride concentrations were prepared by adding equivalent volume of standard fluoride solution to the tap water. For all experiments, 100 mL sample volume was used. All the experiments were conducted at room temperature of 23±2 0 C. The pH of the sample was adjusted by adding 0.1N HCl and 0.1N NaOH.