Bioleaching of spent refinery processing catalyst using Aspergillus niger with high-yield oxalic acid.

@article{Santhiya2005BioleachingOS,
  title={Bioleaching of spent refinery processing catalyst using Aspergillus niger with high-yield oxalic acid.},
  author={Deenan Santhiya and Y -P. Ting},
  journal={Journal of biotechnology},
  year={2005},
  volume={116 2},
  pages={171-84}
}
A spent refinery processing catalyst was physically and chemically characterized, and subjected to one-step and two-step bioleaching processes using Aspergillus niger. During bioleaching of the spent catalysts of various particle sizes ("as received", 100-150 microm, <37 microm, and x =2.97 (average) microm) and pulp densities, the biomass dry weight and pH were determined. The corresponding leach liquor was analysed for excreted organic acids along with heavy metal values extracted from the… CONTINUE READING