Accumulation and effects of cadmium on sulphate-reducing bacterial biofilms

Article Abstract:

The accumulation of cadmium on biofilms was investigated using biofilms with pure- and mixed-cultures of sulphur bacteria to determine the factors that affect the uptake of this heavy metal. Results reveal that cadmium is localized on the superficial layer of the biofilm and that the degree of heavy metal adsorption is correlated with the presence of polysaccharides indicating that accumulation takes place via entrapment or precipitation. Biofilms with mixed cultures were more efficient in accumulating cadmium.

Physiological aspects, Environmental aspects, Cadmium, Sulfur bacteria

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Mixed sulphate-reducing bacterial cultures for bioprecipitation of toxic metals: factorial and response-surface analysis of the effects of dilution rate, sulphate and substrate concentration

Article Abstract:

The use of factorial methods to clarify significant variables and a response-surface analysis to ferret out more details was found to be effective in providing information useful to process optimization as well as efficient in making use of experimental results. This experimental approach was applied in studying the effect of process variables on alkalization and elimination of contaminating toxic metals from a simulated acid leachate by continuous mixed cultures of sulphate-reducing bacteria.

Research, Analysis, Usage, Evaluation, Bioremediation, Factor analysis, Discriminant analysis, Sulfates, Combinatorial optimization, Response surfaces (Statistics)

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