Abstract
Bioadsorption phenomenon is more or less like a chemical reaction and several parameters are bound to affect the process. The pH, amount of adsorbent and agitation time influence the biosorptive potentiality. Hence, the present study on adsorption of Cr(VI) by activated Vetivera roots and Blue green algae Anabaena supports that it is an effective low cost adsorbent for the removal of Cr(VI) from plating effluent. Langmuir and Freundlich adsorption isotherm correlate the equilibrium adsorption data. In batch experiments both Vetiveria and Anabaena species were found to be cost effective biosorbent for the efficient removal of Cr(VI) from the effluent and comparatively Anabaena species was found to adsorb maximum Cr(VI) (88.86%) at a low contact time of 60 min. The data obtained from the experiments and modeling would prove useful in designing and fabricating an efficient treatment plant for Cr(VI) rich effluent.
Highlights
The treatment of waste water containing metals is a challenging problem; Due to rise in rigorous environmental policies, scientists all around the world are desired to develop precise techniques to control the amount of heavy metal in waste water and drinking water
Many researchers have reported the methods of biosorption on chemical modified solid surface [5], it takes some time for the adsorption of heavy metals in water bodies, especially, at ppm level
To envisage the bioadsorptive potentiality of Anabaena and Vetiveria, various methods pertaining to physicochemical analysis of chrome plating effluent, preparation of bioadsorbents, optimization and adsorption isotherm studies were performed
Summary
The treatment of waste water containing metals is a challenging problem; Due to rise in rigorous environmental policies, scientists all around the world are desired to develop precise techniques to control the amount of heavy metal in waste water and drinking water. The presence of heavy metals in wastewater is of great environmental concern and strongly declining microbial activity, as a result adversely affecting biological wastewater treatment processes. Earlier the method of ion exchange has been widely employed to remove heavy metals in water bodies [1,2], but the cost is high. There are reports available on the removal of heavy metals in effluent by complexation of dry biomass [3,4]. These methods were not employed on large scale. Many researchers have reported the methods of biosorption on chemical modified solid surface [5], it takes some time for the adsorption of heavy metals in water bodies, especially, at ppm level
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