Excellence in Research and Innovation for Humanity
%0 Journal Article
%A Haragobinda Srichandan and  Chandra Sekhar Gahan and  Dong-Jin Kim and  Seoung-Won Lee
%D 2012 
%J  International Journal of Environmental, Chemical, Ecological, Geological and Geophysical Engineering
%B World Academy of Science, Engineering and Technology
%I International Science Index 61, 2012
%T Bioleaching of Spent Catalyst using Moderate Thermophiles with Different Pulp Densities and Varying Size Fractions without Fe Supplemented Growth Medium
%U http://waset.org/publications/10084
%V 61
%X Bioleaching of spent catalyst using moderate thermophilic chemolithotrophic acidophiles in growth medium without Fe source was investigated with two different pulp densities and three different size fractions. All the experiments were conducted on shake flasks at a temperature of 65 °C. The leaching yield of Ni and Al was found to be promising with very high leaching yield of 92-96% followed by Al as 41-76%, which means both Ni and Al leaching were favored by the moderate thermophilic bioleaching compared to the mesophilic bioleaching. The acid consumption was comparatively higher for the 10% pulp density experiments. Comparatively minimal difference in the leaching yield with different size fractions and different pulp densities show no requirement of grinding and using low pulp density less than 10%. This process would rather be economical as well as eco-friendly process for future optimization of the recovery of metal values from spent catalyst.

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