Lead tolerance and bioremoval by four strains of green algae from Nigerian fish ponds
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Date
2021-03
Authors
Oyebamiji, O.O
Corcoran, A.A
Edauri, N.P
Ilori, M.O
Amund, O.O
Holguin, F.O
Boeing, W.J
Journal Title
Journal ISSN
Volume Title
Publisher
Elsevier
Abstract
Heavy metals from industry pose threats to human and environmental health. Microalgae are prime candidates to remove heavy metals from water and soil due to their metal-binding affinities, high growth rates, and contamination tolerance. Strain selection and composition of resulting contaminated biomass must be considered for downstream processing. In this study, we assessed the ability of four microalgae strains (Chlorophyceae) that were isolated from contaminated Nigerian fish ponds to take up dissolved lead at environmentally relevant concentrations (<0.05 mg Lā1 ā WHO standard). In a microplate assay, all strains grew in the presence of lead, tolerating concentrations up to 60 ppm, though the addition of dissolved lead affected the growth of the four strains. In a photobioreactor assay, all strains demonstrated the ability to take up dissolved lead, with removal efficiencies ranging from 86 to 93%. The concentrations of lead in contaminated biomass, removal efficiencies, and bioconcentration factors were greatest in one of the isolates Chlorella sp. MOW 12. Our results reinforce the fact that live microalgae have a greater biosorption capacity. Lead recovery from freeze-dried biomass using five different reagents showed that a 0.1 M hydrochloric acid solution was the most effective, with 83.4% recovery. We also showed that presence of lead in the culture medium resulted in an increase in the quantity of protein in the biomass. Elemental analysis of lead-bound biomass showed an increase in elements including boron and copper and a decrease in cobalt and sodium. Synergystic and antagonystic effect in uptake of other elements was strain specific, suggesting the possibility of tailored wastewater treatments depending on specific requirements.
Description
Scholarly article
Keywords
Heavy metal , Elemental analysis , Removal efficiency , Bioremoval , Bioconcentration factor , Research Subject Categories::MEDICINE
Citation
Oyebamiji, O.O Corcoran, A.A Edauri, N.P Ilori, M.O Amund, O.O Holguin, F.O Boeing, W.J. (2021). Lead tolerance and bioremoval by four strains of green algae from Nigerian fish ponds. Algal research, Vol.58, 7p.