Bioremediation Efficiency of Heavy Metals and Azo Dyes by Individual or Consortium Bacterial Species Either as Free orImmobilized Cells: A Comparative Study

Allam, Nanis

doi:10.21608/ejbo.2017.689.1040

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	Bioremediation Efficiency of Heavy Metals and Azo Dyes by Individual or Consortium Bacterial Species Either as Free orImmobilized Cells: A Comparative Study
Article 13, Volume 57, Issue 3, December 2017, Page 555-564 PDF (2.06 MB)
Document Type: Regular issue (Original Article)
DOI: 10.21608/ejbo.2017.689.1040
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Author
Nanis Allam
Botany Department, Microbiology Section, Faculty of Science, Tanta University, Tanta, Egypt
Abstract
THE OBJECTIVE of the present study was to compare between free and immbolized bacterial cultuer/s in bioremediation of heavy metals and dyes to reduce environmental pollutants with the help of biological entities. The bacterial consortium consisting of Sphingomonas paucimobilis, Rhizobium radiobacter, and Bacillus subtilis was developed due to capabilities of the three bacterial species to remove heavy metals from industrial waste water and decolorize methyl orange and Congo red textile azo dyes than their corresponding single cultures. The immobilization of bacterial consortium on Ca-alginate increased its heavy metals removal efficiency more than 10% compared to consortium of free cells after 4 days. Also, decolorization ability of immobilized consortium was conducted for shorter time and higher concentrations of dyes than that of free one. The greater efficiency of immobilized consortium than free single culture may be correlated to synergistic activity of different metabolites of bacterial cultures and protection of cells from toxic pollutants that provided by Ca-alginate matrices which promoting an efficient bio-treatment of industrial effluents containing dyes and heavy metals.
Keywords
Single culture; Immobilization; Heavy metals; Decolorization; Azo dyes; consortium


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