Removal of Pb²âº from aqueous system by live Oscillatoria laete-virens (Crouan and Crouan) Gomont isolated from industrial effluents.
World J Microbiol Biotechnol
; 28(10): 3053-65, 2012 Oct.
Article
in En
| MEDLINE
| ID: mdl-22806744
ABSTRACT
Cyanobacteria have been found to be potential biosorbents of metal ions from waste water. The Pb²âº removal capacity of growing cells of indigenous cyanobacterium Oscillatoria laete-virens (Crouan and Crouan) Gomont was studied under batch experiments and it was found capable of removing Pb²âº of lower concentrations (below 100 mg L⻹). The effects of different concentrations of Pb²âº, on the growth rate of alga were also evaluated. The research parameters include the pH of the solution, contact time, initial concentration of Pb²âº, and culture density. Of the parameters studied, the pH of the solution was found to be the most crucial. The removal of Pb²âº peaked at an initial pH of 5. The data obtained from the equilibrium experiments were found well fitting with the Langmuir isotherm with a maximum sorptive capacity (q(max)) of 20.36 mg g⻹, indicating a good biosorbtive potential of growing cells. This was confirmed using scanning electron microscope and energy dispersive X-ray analysis, which showed the adsorption of lead on the surface of the cell. The species could tolerate a concentration as high as 60 mg L⻹ of Pb²âº. It was observed that the removal obeyed the pseudo-second-order kinetics. The percentage removal was found to decrease with increasing metal concentration, from 10 to 100 mg L⻹. FTIR analysis indicates the involvement of amino, carboxylic and amide groups in the sorption process. Among the desorbing agents evaluated, an efficient recovery of 90.2 % was achieved by HCl, in 24 h. Thus Oscillatoria laete-virens (Crouan and Crouan) Gomont seems to be a promising metal biosorbent for the treatment of Pb²âº, in waste waters.
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Oscillatoria
/
Wastewater
/
Industrial Waste
/
Lead
Language:
En
Journal:
World J Microbiol Biotechnol
Year:
2012
Document type:
Article
Affiliation country:
India