Abilities of Three Microorganisms for Cleaning Cadmium Contaminated Soils

Ihimekpen, N. I.; Atikpo, E.; Kayode-Ojo, N.; Michael, A.

doi:10.5829/ijee.2020.11.02.12

Document Type : Original Article

Authors

¹ Department of Civil Engineering, Faculty of Engineering, University of Benin, Benin City, Edo State, Nigeria

² Department of Civil and Environmental Engineering, Faculty of Engineering, Delta State University, Oleh Campus, PMB 1, Abraka, Delta State, Nigeria.

³ Department of Environmental Technology, Faculty of Environmental Science, Federal University Technology, Owerri, Imo State, Nigeria

https://doi.org/10.5829/ijee.2020.11.02.12

Abstract

The abilities of three indigenous bacteria for bioremediation of cadmium contaminated soils collected from Agbabu Farm Settlement close to mining sites in Ondo state, Nigeria was studied to provide helpful information for soils remediation and soils health management in this sub-region for Millennium Development Goals accomplishment. Bacillus subtilis, Proteus mirabilis, and Escherichia coli isolated from the soils were inoculated into different soil samples conditioned with optimized factors determined from the first phase experiments. The conditioned samples were experimented for residual cadmium concentration with time in days using Atomic Absorption Spectrophotometer. The soil cadmium attenuation from the initial concentration of 70.21 mg/kg to below the maximum allowable of 3 mg/kg was hard for the organisms. Bacillus subtilis performed correction at time 35 days with an efficiency of 96.10 % and residual concentration of 2.74 mg/kg. Proteus mirabilis and Escherichia coli with respective, high efficiencies of 85.05% and 79.35% failed. The removal rate capacities were -0.131d^-1 for B. subtilis; -0.111d^-1for P. mirabilis; -0.105d^-1 for E. coli. Four kinetic models fitted described the experimental data well. The models assessment revealed the removals to be transport controlled as diffusion process was the rate-controlling step.

Keywords

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Iranica Journal of Energy & Environment

Abilities of Three Microorganisms for Cleaning Cadmium Contaminated Soils

References

References

Volume 11, Issue 2
June 2020
Pages 170-177

Abilities of Three Microorganisms for Cleaning Cadmium Contaminated Soils

References

References

Volume 11, Issue 2June 2020Pages 170-177

Volume 11, Issue 2
June 2020
Pages 170-177