decolorization of textile dye by isolated bacterial strains from textile waste and their ability to produce polyhydroxyalkanoate

Polyhydroxyalkanoate (pha) is a type of polymer that is biodegradable, biocompatible, and eco-friendly. in this research, certain bacteria from textile waste, such as curing and bleaching, leather, and sizing waste, were found to produce pha and remove color from textile dyes. three types of bacteria were identified as bacillus cereus sh2, priestia megaterium sh3, and bacillus cereus sh4 through genetic sequencing. these bacteria were grown in a medium with disperse red 73 to assess their ability to remove color and produce phas. the presence of pha in the extracted biopolymer was confirmed using fourier transform infrared spectroscopy (ftir). among the bacteria, sh4 was the most efficient at producing pha (49.09 %), with a concentration of 0.54 gl-1. sh2 showed significant color removal ability (98.91 %), indicating its potential in the treatment of dye wastewaters. the isotherm, kinetics, and thermodynamics of the process were also investigated. the findings indicated that the absorption kinetics and isotherms were most accurately described by the pseudo-first-order and langmuir models, respectively. the thermodynamic analysis of the adsorption process revealed that the adsorption occurred spontaneously and was endothermic in nature. this is the first report of the newly isolated strains from textile waste and their ability in degradation of disperse red 73 and produce pha.