NDLI: Biosorptive recovery of platinum from platinum group metal refining wastewaters by immobilised Saccharomyces cerevisiae.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Mack, C. L. Wilhelmi, B. Duncan, J. R. Burgess, J. E.
Description	Country affiliation: South Africa Author Affiliation: Mack CL ( Department of Biochemistry Microbiology and Biotechnology, Rhodes University, PO Box 94, Grahamstown, 6140, South Africa.)
Abstract	The process of platinum group metal (PGM) refining can be up to 99.99% efficient at best, and although it may seem small, the amount of valuable metal lost to waste streams is appreciable enough to warrant recovery. The method currently used to remove entrained metal ions from refinery wastewaters, chemical precipitation, is not effective for selective recovery of PGMs. The yeast Saccharomyces cerevisiae has been found capable of sorbing numerous precious and base metals, and is a cheap and abundant source of biomass. In this investigation, S. cerevisiae was immobilised using polyethyleneimine and glutaraldehyde to produce a suitable sorbent, capable of high platinum uptake (150-170 mg/g) at low pH (<2). The sorption mechanism was found to be a chemical reaction, which made effective desorption impossible. When applied to PGM refinery wastewater, two key wastewater characteristics limited the success of the sorption process; high inorganic ion content and complex speciation of the platinum ions. The results proved the concept principle of platinum recovery by immobilised yeast biosorption and indicated that a more detailed understanding of the platinum speciation within the wastewater is required before biosorption can be applied. Overall, the sorption of platinum by the S. cerevisiae sorbent was demonstrated to be highly effective in principle, but the complexity of the wastewater requires that pretreatment steps be taken before the successful application of this process to industrial wastewater.
File Format	HTM / HTML
ISSN	02731223
Issue Number	1
Journal	Water Science & Technology
Volume Number	63
e-ISSN	19969732
Language	English
Publisher	IWA Publishing
Publisher Date	2011-01-01
Publisher Place	Great Britain (UK)
Access Restriction	Subscribed
Subject Keyword	Discipline Hydrology Platinum Metabolism Saccharomyces Cerevisiae Water Pollutants, Chemical Journal Article
Content Type	Text
Resource Type	Article
Subject	Environmental Engineering Water Science and Technology

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