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ABSTRACT
Biosorption is a natural phenomenon where living organisms remove heavy metals from aqueous solutions, offers a promising alternative for previous methods for removal of heavy metals. Bacteria, in particular, have shown great potential as biosorbents for heavy metals. The project was aimed at determination of lead biosorption efficiency of Bacteria isolated from the soil of Uwelu metal dumpsite. Soil sample was collected from Uwelu metal dumpsite, Benin City, Edo state, Nigeria, the sample was taken to the laboratory for bacteria isolation and identification. The isolates were screened for Lead percentage tolerance. The screened isolates were test for Lead biosorption efficiency. The bacteria identified were Bacillus megaterium, Enterobacter aerogenes, Klebsiella pneumonia, Enterobacter cloacae, Pseudomonas aeruginosa, Bacillus mycoides and Enterococcus faecalis. The bacterial isolates with the highest percentage tolerance to lead were Bacillus megaterium and Bacillus mycoides. Results from the biosorption deduction for pH change of the medium were observed for two days, lead metal increased from 6.8 to 6.16 further towards the alkaline side for Bacillus megaterium, while for Bacillus mycoides increased from 6.8 to 6.17 towards the alkaline side. Analysis on Lead biosorption removal, showed that Bacillus megaterium had 6.8% Lead sorption while Bacillus mycoides was 2.6%. Bacillus megaterium from metal dumpsite have the ability to remove the heavy metal Lead effectively. The biosorption of heavy metal by bacteria is a promising technology for the remediation of heavy metal polluted soils.
