STATISTICAL OPTIMIZATION OF ADSORPTION VARIABLES FOR BIOSORPTION OF CHROMIUM (VI) USING CRUDE TAMARIND POD SHELL AND ACTIVATED CARBON

Sudhanva.M.Desai, N.C.L.N Charyulu, Satyanarayana V Suggala

Abstract: Hexavalent Chromium is a major pollutant released during several industrial operations. In this study low-cost agro waste biosorbent tamarind (Tamarindus indica) pod shells with partial and complete Pyrolysed forms were explored for the removal of hexavalent chromium ions from aqueous solution. All the biosorption experiments were carried out in batch mode to optimize process parameters using response surface methodology. Based on central composite design, quadratic model was developed to correlate the variables to the response. Statistical analysis was carried out to identify the most influential factor for all the adsorbents. Through analysis of variance (ANOVA) it was observed that pH is significant for crude and temperature is significant for pyrolysed adsorbent. Among all the adsorbents tested, crude tamarind, removed a maximum of 96.09% of chromium with biomass loading of 4.59g/ 100ml at the optimized conditions of initial concentration 71.7213 mg/l, pH 2.47, and temperature of 41.82o C.

Keywords: Biosorption, Tamarindus indica, Hexavalent chromium, Pyrolysis, ANOVA

DOI: https://doi.org/10.15623/ijret.2014.0307076