title: Biosorption of Congo Red from aqueous solution by Bacillus weihenstephanensis RI12; effect of SPB1 biosurfactant addition on biodecolorization potency.
abstract: Bacillus weihenstephanensis RI12, isolated from hydrocarbon contaminated soil, was assessed for Congo Red bio-treatment potency. Results suggested the potential of this bacterium for use in effective treatment of Congo Red contaminated wastewaters under shaking conditions at acidic and neutral pH value. The strain could tolerate higher doses of dyes as it could decolorize up to 1,000 mg/l of Congo Red. When used as microbial surfactant to enhance Congo Red biodecolorization, Bacillus subtilis SPB1-derived lipopeptide accelerated the decolorization rate and maximized the decolorization efficiency at an optimal concentration of biosurfactant of about 0.075%. Studies ensured that Congo Red removal by this strain could be due to an adsorption phenomena. Germination potencies of tomato seeds using the treated dyes under different conditions showed the efficient biotreatment of the azo dye Congo Red especially with the addition of SPB1 biosurfactant. To conclude, the addition of SPB1 bioemulsifier reduced energy costs by reducing the effective decolorization period; the biosurfactant stimulated bacterial decolorization method may provide a highly efficient, inexpensive and time-saving procedure in the treatment of textile effluents.
authors.affiliation: National School of Engineers of Sfax, Unité "Enzymes et Bioconversion", ENIS, Université de Sfax, BP W 3038 Sfax, Tunisia and Higher Institute of Biotechnology of Sfax, Université de Sfax, Sfax, Tunisia E-mail: inesmnif2011@gmail.com.
authors.forename: Inès
authors.initials: I
authors.lastname: Mnif
authors.affiliation: National School of Engineers of Sfax, Unité "Enzymes et Bioconversion", ENIS, Université de Sfax, BP W 3038 Sfax, Tunisia and Higher Institute of Biotechnology of Sfax, Université de Sfax, Sfax, Tunisia E-mail: inesmnif2011@gmail.com.
authors.forename: Raouia
authors.initials: R
authors.lastname: Fendri
authors.affiliation: National School of Engineers of Sfax, Unité "Enzymes et Bioconversion", ENIS, Université de Sfax, BP W 3038 Sfax, Tunisia and Higher Institute of Biotechnology of Sfax, Université de Sfax, Sfax, Tunisia E-mail: inesmnif2011@gmail.com.
authors.forename: Dhouha
authors.initials: D
authors.lastname: Ghribi
mesh_terms: D000327:Adsorption; D001407:Bacillus / Q000145:classification / Q000378:metabolism*; D001673:Biodegradation, Environmental; D004396:Coloring Agents; D003224:Congo Red / Q000737:chemistry / Q000378:metabolism*; D006863:Hydrogen-Ion Concentration; D013501:Surface-Active Agents / Q000737:chemistry*; D014865:Waste Disposal, Fluid / Q000379:methods; D062065:Wastewater; D014874:Water Pollutants, Chemical / Q000737:chemistry / Q000378:metabolism
chemical_list: D004396:Coloring Agents; D003224:Congo Red; D013501:Surface-Active Agents; D062065:Wastewater; D014874:Water Pollutants, Chemical