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Technical
Note
Biosorption and
flotation biomass, loaded by precious or toxic metals
V. P. Nebera1, P. M. Siolozhenkin2
1 Moscow State Geological Prospecting
University, Russia
2 Institute Comprehensive Exploitaition Earth Resourses, Moscow, Russia
Received 10 April 2002; accepted 11 July 2002
ABSTRACT
Different
microorganisms have been studied, capable to accumulate metals by their cells because of
their resistivity to heavy metals. The separation of loaded biomass from the liquid by the
filtration, frequentative flocculation, centrifuging has low effectivity. The most
perspective is so named biosorbtive flotation. As sorbents can emerge biomasses of
different microorganisms: bacteria, micromycetes, fungi, yeasts (baker's, beer and
forage), active silts and microalga. Scientific and practical urgency of problem consists
in revealing an intercoupling between the sorption of non-ferrous and precios metals by
the biomass and its floatability, determination optimal parameters of flotation biomass
loaded by metals. This will allow to find basic role of polyvalent metals in
hydrophobizing the surface of cells of microorganisms, and reveal new aspects of metals
action at flotation separation biomasses of microorganisms, optimize technologies of
extraction of metals from the dilute solutions and give concrete recommendations on
bioflotation technologies of extraction of noble and non-ferrous metals.
Keywords: Biosorption; Bacteria; Micromycetes; Fungi; Yeasts; Alga; Metal ions;
Biomass flotation
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