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EN
It has been demonstrated that various flotation reagents influence, in a different manner, the metabolic activity of the sulfur-oxidizing bacteria Acidithiobacillus thiooxidans (strain C1 being isolated from the Fe-Zn tailings water) growing in the Waksman/Joffe (W/J) liquid culture medium that contains thiosulfate as a sole energy source for bacteria growth. The ethyl- and amyl xanthates as well as the frothing reagent stimulated, to a limited extent, the tested C1-bacteria metabolic activity. The very well documented bacterially-influenced acidification of the W/J solution supplemented with the ethylor the amyl xanthates suggests the possibility of these substances effective acid-degradation in the post-industrial environments rich in various flotation reagents, mainly xanthates. Both the activator containing the carbamate ethyl-derivative and the modifier composed of Cu(II)-ions caused a complete inactivation of the A. thiooxidans C1-metabolism. It is suggested that some unexpected chemical reactions may proceed in the tested systems, as a result of interactions between the culture medium components, flotation reagents, their decomposition products, and also the products of bacterial metabolism.
PL
Badano sorpcję jonów Cu(II) z rozcieńczonych roztworów wodnych przez granulki alginianowe. Wyznaczono izotermy równowagi dla szerokiego zakresu stężeń alginianów w granulkach. Stwierdzono, że równanie Langmuira dobrze opisywało dane doświadczalne, a stale równowagowe zależały od stężenia alginianu w granulkach.
EN
The sorption of Cu(II) ions from dilute aqueous solutions by alginate beads was studied. Equilibrium isotherms were determined for wide range of alginate concentrations in the beads. It was found that the Langmuir equation described the experimental data well and the equilibrium constants depended on concentration of alginate in the beads.
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