International Journal of Chemical Engineering
Author(s) : A.B.SATHYA , R.SIVASHANKAR, SREEDA PALLIPAD , V.SIVASUBRAMANIAN
Release of coloured textile effluent in to aquatic environment is detrimental as they prevent penetration of light in to water, thereby affecting aquatic life and creates harmful water. Biosorption is an alternative treatment available other than physicochemical and biological methods to treat these toxic effluents. This study investigates the potential of water hyacinths to adsorb hazardous azo dye metanil yellow from aqueous solution. Metanil Yellow, is a widely used toxic dye containing one or more azo bonds (-N=N-). Metanil Yellow is used in number of industries such as textile, dyeing, food, cosmetics, paper printing industries and with textile industries as large consumers. Biosorption process was carried out using immobilized dead aquatic weeds. The influences of adsorption parameters such as initial dye concentration, pH, contact time, adsorbent dosage, agitation speed, and temperature were evaluated and optimized. Further the mechanism of biosorption earned good fits for Langmuir isotherm model. The pseudo first order and second order kinetic model described well the experimental data. The batch studies clearly suggest that the maximum adsorption capacity for the removal of Matanil Yellow dye were obtained at 6 pH and up to 98.8 % color removal is achieved with contact time of 240mins. Further desorption techniques were employed to recover the loaded pollutants and it is found to be the reusability of the immobilized aquatic weeds after storage may be a potential advantage in wastewater treatment.