ISSN:
1476-5535
Keywords:
Zoogloea ramigera
;
Immobilization
;
Adsorption
;
Cadmium
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
,
Process Engineering, Biotechnology, Nutrition Technology
Notes:
Summary Zoogloea ramigera 115 was immobilized into beads of calcium-alginate and placed into batch air-bubbled column reactors. In the absence of any added nutrients the immobilized bacterium adsorbed Cd from solutions containing levels of 2 and 20 μg ml−1 per day, over a period of 21 and 20 days, respectively. Adsorption of Cd from solutions containing 20 μg ml−1 Cd was better than 90% for 16 days. Beads treated with Cd at 2 μg ml−1 never adsorbed less than 95% of the metal. Alginate adsorbed Cd as well, but inclusion of cells changed the effectiveness of adsorption. Of a 250 μg ml−1 Cd solution, alginate adsorbed 70.4% Cd in 60 min whereas alginate plus cells adsorbed 90.5% in the same time span. Temperature had no effect on adsorption by immobilized cells at levels of 2 and 10 μg ml−1 Cd. However at higher concentrations, binding was enhanced as temperature increased.Z. ramigera beads were stable during all treatments and for prolonged periods of time (21 days).
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01576431
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