CENTRAL COMPOSITE DESIGN OPTIMIZATION OF FLUORIDE REMOVAL BY SPIROGYRA BIOMASSN. SIVARAJASEKAR, R. SUBASHINI, J. PRAKASH MARAN AND S. KANDASAMYAbstract In this work, microwave assisted thermally activated adsorbent was prepared from Spirogyra biomass and the variable affecting adsorptive efficiency for fluoride removal were simultaneously optimized using the central composite design (CCD). The effects of variables viz. adsorbent dosage (0.1 1.0 g L-1), sample pH (3 9), initial concentration (30 60 mg L-1), and temperature (25 45oC) were optimized. The statistical parameters were calculated and the quadratic polynomial model with R2 = 0.9886 and F value = 7168.95 was obtained. Further, the response surface diagrams were plotted accordingly. Non-linear optimization was carried out and under the defined optimum conditions the predicted fluoride removal efficiency with 95% confidence level was found to be 88.74±2.1%, which is in agreement with the experimentally arrived value of 87.96±2.3%.
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