Please use this identifier to cite or link to this item: https://doi.org/10.1016/j.jbiotec.2005.07.002
Title: Use of adapted Aspergillus niger in the bioleaching of spent refinery processing catalyst
Authors: Santhiya, D.
Ting, Y.-P. 
Keywords: Aspergillus niger
Bioleaching
Hazardous waste
Spent catalyst
Issue Date: 2-Jan-2006
Source: Santhiya, D., Ting, Y.-P. (2006-01-02). Use of adapted Aspergillus niger in the bioleaching of spent refinery processing catalyst. Journal of Biotechnology 121 (1) : 62-74. ScholarBank@NUS Repository. https://doi.org/10.1016/j.jbiotec.2005.07.002
Abstract: Spent refinery processing catalyst is listed as a hazardous waste; the toxicity characteristic leaching procedure (TCLP) extracts of the catalyst are found to contain heavy metals at concentrations exceeding the regulated levels. In the present investigation, Aspergillus niger was adapted to single metal ions Ni, Mo or Al (at 100-2000 mg/L in steps of 100 mg/L) and then to a mixture of Ni, Mo and Al (at a mass ratio of 1:2:6, as approximately present in the spent catalyst). Adaptation experiments with single metals showed that the fungus could tolerate up to 1000 mg/L Ni, 1200 mg/L Mo and 2000 mg/L Al. In the presence of a mixture of these metals, the fungus was able to tolerate up to 100 mg/L Ni, 200 mg/L Mo and 600 mg/L Al. One-step bioleaching experiments with 1 wt% spent catalyst (of particle size <37 μm) were carried out using un-adapted and various adapted fungal strains. In contrast to the adapted strains, the un-adapted strain showed no growth in the presence of the catalyst. Ni:Mo:Al-adapted strain was the most efficient in the leaching of metals from the catalyst (at 78.5% Ni, 82.3% Mo and 65.2% Al) over 30 days due to its tolerance to the toxic elements at 1 wt%. More importantly, the Ni:Mo:Al-adapted strain was capable of bioleaching up to 3 wt% spent catalyst. The TCLP extracts of the spent catalyst after bioleaching using the Ni:Mo:Al-adapted strain showed the concentrations of Ni and Mo were well within the regulated levels. © 2005 Elsevier B.V. All rights reserved.
Source Title: Journal of Biotechnology
URI: http://scholarbank.nus.edu.sg/handle/10635/64774
ISSN: 01681656
DOI: 10.1016/j.jbiotec.2005.07.002
Appears in Collections:Staff Publications

Show full item record
Files in This Item:
There are no files associated with this item.

SCOPUSTM   
Citations

56
checked on Dec 18, 2017

WEB OF SCIENCETM
Citations

49
checked on Nov 22, 2017

Page view(s)

32
checked on Dec 17, 2017

Google ScholarTM

Check

Altmetric


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.