Bioleaching of spent fluid catalytic cracking catalyst using Aspergillus niger

被引:152
作者
Aung, KMM [1 ]
Ting, YP [1 ]
机构
[1] Natl Univ Singapore, Dept Chem & Biomol Engn, Singapore 119260, Singapore
关键词
bioleaching; Aspergillus niger; solid wastes; spent catalyst; two-step bioleaching;
D O I
10.1016/j.jbiotec.2004.10.008
中图分类号
Q81 [生物工程学(生物技术)]; Q93 [微生物学];
学科分类号
071005 ; 0836 ; 090102 ; 100705 ;
摘要
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. (C)D 2004 Elsevier B.V. All rights reserved.
引用
收藏
页码:159 / 170
页数:12
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