Combined biological and advanced oxidation process for decolorization of textile dyes

The present study evaluated the efficiency of combined biological and AOPs treatment (Bio–AOP) using Aeromonas hydrophila SK16 and AOPs-H2O2 (4%) for the remediation of the textile dyes. Bio–AOP treatment showed 100% decolorization of Reactive Red 180 (RR 180), Reactive Black 5 (RB 5) and Remazol Red (RR), while 72% decolorization was observed in individual treatments. Combined treatment significantly reduced BOD and COD of RR 180–78 and 68%, RB 5–52 and 83% and RR—42 and 47%, respectively as compare to individual treatment. Significant increased levels of tyrosinase, laccase, lignin peroxidase, riboflavin reductase and azoreductase were observed in A. hydrophila SK16. Fourier-transform infrared spectroscopy and high-performance liquid chromatography analysis showed noteworthy biotransformation of textile dyes. Possible metabolic pathway of degradation of dyes were predicted based on GC–MS analysis. This study indicates that the Bio–AOP treatment is more efficient than an individual treatment of textile wastewater.