Cadmium biosorption on Spirulina platensis biomass.
Dry biomass of Spirulina platensis re-hydrated for 48 h was employed as a biosorbent in tests of cadmium(II) removal from water. Various concentrations of biomass (from 1 to 4 g l(-1)) and metal (from 100 to 800 mg l(-1)) were tested. Low biomass levels (X(o)2 g l(-1)) ensured metal removal up to 98% only at Cd(0)= 100 and 200 mg l(-1), while X(o)2.0 g l(-1) were needed at Cd(0)=400 mg l(-1) to achieve satisfactory results. Whereas X(o)=4.0 g l(-1) was effective to remove up to Cd(0)=500 mg l(-1), a further increase in metal concentration (Cd(0)=600 and 800 mg l(-1)) led to progressive worsening of the system performance. At a given biomass levels, the kinetics of the process was better at low Cd(2+) concentrations, while, raising the adsorbent level from 1.0 to 2.0 g l(-1) and then to 4.0 g l(-1), the rate constant of biosorption increased by about one order of magnitude in both cases and the adsorption capacity of the system progressively decreased from 357 to 149 mg g(-1).
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Department of Chemical and Process Engineering "G.B. Bonino", Genoa University, via Opera Pia 15, I-16145 Genoa, Italy.
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D000327:Adsorption; D001673:Biodegradation, Environmental; D018533:Biomass; D002104:Cadmium / Q000378:metabolism*; D003890:Desiccation; D004787:Environmental Pollution; D007700:Kinetics; D019216:Metals, Heavy / Q000378:metabolism; D008954:Models, Biological; D053545:Spirulina / Q000254:growth & development / Q000378:metabolism*; D014871:Water Microbiology
D019216:Metals, Heavy; D002104:Cadmium