Biological Treatment of Colored Wastewater by Streptomyces fulvissimus CKS 7

Abstract

This study aims to investigate an advanced biological processes these are relayed to biodegradable potential of growing microbial cells for contaminated water treatment. Thus the use of the Streptomyces fulvissimus CKS 7 has been evaluated for decolorizing efficiency of a solution containing a cationic triphenylmethane dye, crystal violet (CV). The color reduction was monitored by UV–Vis spectroscopic analysis, through changes in their absorption spectrum and comparing the results, to those of the respective controls. It was found that the CKS 7 performed well and reached up to 100 % of effectiveness. The required process parameters have been apparently mild and include the 10 % inoculum size, reaction temperature of 27-30° C, under shaking conditions, whereas the time course of decolorization has been concentration dependent. A possible mechanism for removing dye from working medium was accomplished in two steps: binding of the dye by bacterial cells on their surface in addition to dye biodegradation by bacterial intracellular enzymes. After one cycle of the complete dye removal, adapted culture was successfully reused for the same purpose. The phytotoxicity analysis revealed that no toxic compounds were present in decolorized medium, indicating that the use of CKS 7 bacteria seems to be promising applicants for contaminated water treatment.