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Title: Bioleaching of spent fluid catalytic cracking catalyst using Aspergillus niger
Authors: Aung, K.M.M.
Ting, Y.-P. 
Keywords: Aspergillus niger
Solid wastes
Spent catalyst
Two-step bioleaching
Issue Date: 16-Mar-2005
Citation: Aung, K.M.M., Ting, Y.-P. (2005-03-16). Bioleaching of spent fluid catalytic cracking catalyst using Aspergillus niger. Journal of Biotechnology 116 (2) : 159-170. ScholarBank@NUS Repository.
Abstract: The use of the fungus Aspergillus niger for the bioleaching of heavy metals from spent catalyst was investigated, with fluid catalytic cracking (FCC) catalyst as a model. Bioleaching was examined in batch cultures with the spent catalysts at various pulp densities (1-12%). Chemical leaching was also performed using mineral acids (sulphuric and nitric acids) and organic acids (citric, oxalic and gluconic acids), as well as a mixture of organic acids at the same concentrations as that biogenically produced. It was shown that bioleaching realised higher metal extraction than chemical leaching, with A. niger mobilizing Ni (9%), Fe (23%), Al (30%), V (36%) and Sb (64%) at 1% pulp density. Extraction efficiency generally decreased with increased pulp density. Compared with abiotic controls, bioleaching gave rise to higher metal extractions than leaching using fresh medium and cell-free spent medium. pH decreased during bioleaching, but remained relatively constant in both leaching using fresh medium and cell-free spent medium, thus indicating that the fungus played a role in effecting metal extraction from the spent catalyst. © 2004 Elsevier B.V. All rights reserved.
Source Title: Journal of Biotechnology
ISSN: 01681656
DOI: 10.1016/j.jbiotec.2004.10.008
Appears in Collections:Staff Publications

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