4.  Kinetics of Fluoride Removal from Groundwater Using MgO

Authors: K. Margandan, R. Agrawal, R. Acharya, S. Sharma and K. Qanungo


Abstract:

Using MgO (light) the adsorption of fluoride from fluoride contaminated groundwater samples from three tube wells of the villages of Pilaniyon Ki Dhani and Kumaron Ki Dhani, a sub-village of Shola in Lakshmangargh Tehsil of the Sikar District of Rajasthan, India has been studied. The pseudo first order adsorption, pseudo second order adsorption, Elovich and intraparticle diffusion models have been used to fit the fluoride adsorption capacity (qt) data. A very high correlation coefficient for all the tube wells (R2 = 0.997, 0.996, 0.997) were found using the pseudo second order rate equation. Using the constants derived from the least square regression plots, the modeled fluoride adsorption capacity (qt) has been calculated from the various equations. The sum of square error calculations of the calculated qt values is minimum for the Elovich equations. In the initial period of contact of MgO with the fluoride contaminated ground water, the fluoride removal is mainly by intraparticle diffusion. The percentage of fluoride removal increases with increasing dosage of MgO while at the same time the adsorption capacity at equilibrium decreases. The minimum dosage of MgO which causes the maximum percentage removal of fluoride from water, while at the same time has the highest equilibrium adsorption capacity has been determined.


Keywords: MgO, adsorption, kinetics, groundwater

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