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Textile industries monopolize the use of synthetic and natural colors, claiming they are safe for the environment. These dyes have disastrous repercussions when released into the terrestrial and aquatic environment. The main purpose of the study was to isolate a biosurfactant‐producing bacterium from textile effluent‐contaminated soil and study its potential for dye degradation. Biosurfactant was extracted from Rhodococcus ruber strain TES III, a bacterium isolated from textile water contaminated soil. This biosurfactant‐producing bacterium was capable of decolorizing both synthetic dyes like methyl orange, methylene blue, and natural dyes like Indigo. There was a 2‐fold increase in methyl orange degradation after 48 hours, a 1‐fold increase in methylene blue degradation, and a 4.13‐fold increase in indigo dye degradation. Based on the foregoing data, we conclude that the biosurfactant‐producing bacteria Rhodococcus ruber strain TES III has a high potential for dye degradation and hence can be used in wastewater treatment of textile industries.

In the chemical industry, 1,4-diethylene dioxide, commonly called dioxane, is widely used as a solvent as well as a stabilizing agent for chlorinated solvents. Due to its high miscibility, dioxane is a ubiquitous water contaminant. This study investigates the effectiveness of catalyst- and ultrasound (US)-assisted persulfate (PS) activation with regard to degrading dioxane. As a first step, a composite catalyst was prepared using zeolite. A sonochemical dispersion and reduction method was used to dope zeolite with iron nanoparticles (FeNP/Z). In the subsequent study, the reaction kinetics of dioxane degradation following the single-stage and two-stage addition of PS was examined in the presence of a catalyst. Using GC-MS analysis, intermediate compounds formed from dioxane degradation were identified, and plausible reaction pathways were described. Upon 120 min of sonication in the presence of a catalyst with a two-stage injection of PS, 95% 100 mg/L dioxane was degraded. Finally, the estimated cost of treatment is also reported in this study. Sonolytically activated PS combined with a FeNP/Z catalyst synergizes the remediation of biorefractory micropollutants such as dioxane.

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