title: Biological treatment of colored wastewater by Streptomyces fulvissimus CKS 7.
abstract: This study aims to investigate the biological processes related to the biodegradable potential of growing microbial cells for contaminated water treatment. Thus, the use of the Streptomyces fulvissimus CKS 7 (CKS7) has been evaluated for decolorizing efficiency of a solution containing a cationic triphenylmethane dye, crystal violet. The color reduction was monitored by UV-Vis spectroscopic analysis, through changes in their absorption spectrum and comparing the results with those of the respective controls. It was found that the CKS7 performed well and reached up to 100% effectiveness. The required process parameters have been apparently mild and include the reaction temperature of 27-30 °C, 10% inoculum size, under shaking conditions, whereas the time course of decolorization had been concentration dependent. A possible mechanism for removing dye from the working medium was accomplished in two steps: the binding of the dye on the bacterial cell surface, in addition to the dye biodegradation by the bacterial intracellular enzymes. After one cycle of the complete dye removal, the adapted culture was successfully reused for the same purpose. The phytotoxicity analysis revealed that non-toxic compounds were present in decolorized medium, indicating that the CKS7 bacteria seem to be a promising application for contaminated water treatment.
authors.affiliation: Department of Biochemical Engineering and Biotechnology, Faculty of Technology and Metallurgy, University of Belgrade, Karnegijeva 4, 11000 Belgrade, Serbia E-mail: abuntic@tmf.bg.ac.rs.
authors.forename: A V
authors.initials: AV
authors.lastname: Buntić
authors.affiliation: Department of Biochemical Engineering and Biotechnology, Faculty of Technology and Metallurgy, University of Belgrade, Karnegijeva 4, 11000 Belgrade, Serbia E-mail: abuntic@tmf.bg.ac.rs.
authors.forename: M D
authors.initials: MD
authors.lastname: Pavlović
authors.affiliation: Department of Biochemical Engineering and Biotechnology, Faculty of Technology and Metallurgy, University of Belgrade, Karnegijeva 4, 11000 Belgrade, Serbia E-mail: abuntic@tmf.bg.ac.rs.
authors.forename: S S
authors.initials: SS
authors.lastname: Šiler-Marinković
authors.affiliation: Department of Biochemical Engineering and Biotechnology, Faculty of Technology and Metallurgy, University of Belgrade, Karnegijeva 4, 11000 Belgrade, Serbia E-mail: abuntic@tmf.bg.ac.rs.
authors.forename: S I
authors.initials: SI
authors.lastname: Dimitrijević-Branković
mesh_terms: D019149:Bioreactors; D004396:Coloring Agents / Q000737:chemistry / Q000378:metabolism*; D005840:Gentian Violet / Q000378:metabolism; D013302:Streptomyces / Q000378:metabolism*; D014865:Waste Disposal, Fluid / Q000379:methods; D062065:Wastewater / Q000382:microbiology*; D014874:Water Pollutants, Chemical / Q000737:chemistry / Q000378:metabolism; D018508:Water Purification
chemical_list: D004396:Coloring Agents; D005840:Gentian Violet; D062065:Wastewater; D014874:Water Pollutants, Chemical