New chemical products formation from textile dye degradation, chitinolytic and antioxidant activity in new strain nbpc5-18 of Cellulosimicrobium sp. TH-20

•A new strain nbpc5–18 Cellulosimicrobium was isolated from the filaments of Scytonema.•Characterization by phenotypic, chemotaxonomic and 16S rRNA gene sequencing.•The strain from genus Cellulosimicrobium was used for the first time for dye degradation and showed efficient dye decolourization.•It also exhibits best antioxidant, chitin hydrolysis and antifungal activity.•The enzymes played crucial role and new chemical products were formed in degradation of dyes.