ELIMINATION OF HEXAVALENT CHROMIUM ION FROMELECTROPLATING INDUSTRIAL WASTEWATER USING LOCALLYAVAILABLE ADSORBENTSVATHSALA M.N., S. N. MAYA NAIK, M. MANOJ KUMAR AND SHANKARAAbstract Human made activities such as industrial practices have released large amount of waste waters into the environment, this has led to the existence of various emerging contaminants (which areexisting in the wastewaters) in the environmental parts. In the process of removing them fromdifferent parts of the environment, method of adsorption is used, this method is proved to be mosteconomical and reliable. In this study, sugarcane bagasse and groundnut shell has been used anadsorbents for the removal of Cr (VI) from electroplating industry waste water, this metal ion isknown to be potentially carcinogenic and mutagenic in nature. Batch experiments and Adsorption isotherms tests were carried out to study the adsorption characteristics of chromium. The removal efficiency of Cr (VI) from wastewater has been compared with different sorption parameters with two adsorbents. The effect of adsorbent dose, contact time and pH were analyzed using batch experiments. The isotherm models were studied to check the suitability of the sorption data of ion with sugarcane bagasse and groundnut shell. Column analysis has been done to check the removal efficiency under different bed depth and initial metal concentration. It is found that under optimum conditions, maximum reduction of Cr (VI) was observed to be 70.12% and 91.28% for sugarcane bagasse and groundnut shell respectively. In isotherm studies, Langmuir isothermmodel best fits for sugarcane bagasse sorption data with a value of R2=0.992 and Fruendlich modelts best to the sorption data of Cr (V I) by groundnut shell with value of R2=0.942. In the columnanalysis, the removal efficiency increases with the increase of bed depth whereas removal efficiency decreases with the increase of metal concentration. The study showed that groundnutshell (maximum removal is 91.40%) is more efficient than sugarcane bagasse (maximum removalis 78.13%). |