Sorption of heavy metals to Phormidium laminosum biomass
Journal Article
·
· Biotechnology and Applied Biochemistry
OSTI ID:456798
- Universidad del Pais Vasco, Bilbao (Spain)
The capacity to adsorb a number of heavy metals [Fe(II), Cr(III), Cd(II), Pb(II), Zn(II), Cu(II) and Ni(II)] by heat-dried biomass of the non-N{sub 2}-fixing cyanobacterium Phormidium laminosum was examined. Pretreatment of biomass with alkaline (1 M NaOH or Na{sub 2}CO{sub 3}) washes led to increased metal adsorption, whereas acid treatment was inadequate. Exopolysaccharides present in the mucilaginous layer covering nitrogen-starved cells did not improve the adsorption capacity of the biomass. Biosorption was a very fast and pH-dependent process for most metals investigated. Generally, binding showed a minimum at pH < 3, but increased clearly with pH and reached a maximum at about pH 6-7. In contrast, the amount of metal bound increased with the biomass and the amount of available metal. Constants from Langmuir isotherms were calculated and the order of relative affinities for the studied metals was established according to the sorption intensity. Far from being reduced, the biosorption of the tested metals, with the exception of Ni(II), was slightly enhanced in the presence of high concentrations of Ca{sup 2+} (up to 200 p.p.m.). Finally, desorption attempts with 0.1 M H{sub 2}SO{sub 4} succeeded to different degrees depending on the metal. Alkaline conditioned biomass of P. laminosum can constitute an interesting and novel biosorbent of heavy metals to depollute wastewaters, even in hard waters containing a high concentration of Ca{sup 2+}. 38 refs., 5 figs., 2 tabs.
- OSTI ID:
- 456798
- Journal Information:
- Biotechnology and Applied Biochemistry, Journal Name: Biotechnology and Applied Biochemistry Vol. 22; ISSN BABIEC; ISSN 0885-4513
- Country of Publication:
- United States
- Language:
- English
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