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REMOVAL OF FLUORIDE FROM CONTAMINATED WATER USING LIME SLURRY IMPREGNATED FLY-ASH

Abstract

Fly-ash (FA) collected from coal fired power station (Kota Thermal Power Station) was impregnated with lime slurry, activated thermally and used as a low cost adsorption catalyst (LSFA) for defluoridating contaminated water. The synthesized LSFA catalyst was characterized for structural minirological, physicochemical and morphological properties using XRD, XRF, FT-IR and SEM analytical techniques. Results showed that activated fly-ash due to increased crystallinity property and increased Si-O-Ca phases possesses more activity over surface to act as a suitable adsorbent to remediate fluoride from drinking water. The application of fly-ash and Kota stone (lime) slurry in synthesis of a low cost adsorbent finds a noble way to utilize these abundant waste materials whose indiscriminate disposal pose a threat to the environment. The adsorption kinetics of F-over the LSFA investigated using batch techniques. The Langmuir and Freundlich isotherm models were applied to the equilibrium data. Out of the five kinetics models applied, first order kinetics model was found to be the best to represent the adsorption kinetics.

SHEFALI SAXENA, SHWETA SAXENA , U. CHANDRAWAT AND A. RANI

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