Biosorptive profile of synthetic and natural humiresin for the remediation of metallic water pollutants

To evaluate the bioremediation efficiency of natural humic substances, over it's synthetic counterpart, a comparative batch equilibration biosorption assay have been carried out employing radiotracers on different humi-resins. The biosorptive profile of various humiresins as devised hereby, attempts to justify an innovative and concrete role of dry cow dung powder (DCP), in 'as it is form', for the bioremediation of metal pollutants such as Cr(III), Cr(VI), Cd(II), Hg(II) and Sr(II). Our comparative results conclude that, with all other optimized parameters as obtained 100 mg of DCP removes Cr(III) at pH 6, Cd(II) at pH 3 and Hg(II) at pH 3 to 70-75 and 80-85 % respectively. Also, at pH 1 with 250 mg of DCP 70-75 % Cr(VI) is removed. Similarly, 90-95 % of Sr(II) is sequestered at pH 6, with 350 mg of DCP. The study on thermodynamic, kinetic and isotherm modelling of DCP indicates feasible, eco-friendly and efficient process.