Environment friendly degradation and detoxification of Congo red dye and textile industry wastewater by a newly isolated Bacillus cohnni (MW406977)

Abstract Textile industry wastewater (TIWW) is a major source of environmental pollution causing serious threats to the all life forms and thus, it must be adequately treated before its final discharge for the safety of environment and public health. In present study, a potential bacterial strain (RKS9) was isolated from textile (wastewater & sludge) sample for the effective treatment of TIWW resulting in a significant reduction in pollution parameters such as ADMI color (93.87%), COD (77.35%), BOD (86.02%), TDS (66.75%), TOC (67.25%), TSS (60.34%), and phenol (68.55%) within 48 h. This bacterium also decolorized 99% of Congo red dye (100 mg L−1) within 12 h and removed 59.76%, 40.51%, 52.71% and 26.51% cadmium, chromium, lead and nickel, respectively from TIWW. The activities of azoreductase, laccase, lignin peroxidase (LiP) and manganese peroxidase (MnP) was monitored and metabolites produced during the treatment of dye and TIWW were also analyzed by FT-IR and GC-MS analysis. The phytotoxicity of untreated and treated TIWW was assessed by seed germination and seedling growth parameters of Phaseolus mungo L and results showed a significant reduction in the toxicity of treated TIWW suggesting that the isolated bacterium RKS9 has a remarkable potential to effectively decolorize/detoxify the TIWW.