Electrochemical oxidation and aerobic biodegradation with isolated bacterial strains for dye wastewater: Combined and integrated approach

Degradation of Procion Scarlet a reactive dye in dye effluent is investigated by electrochemical and biological oxidation in individual, combined and integrated methods. The main objective of the present work is to reduce the COD and colour of the dye effluent containing Procion Scarlet dye. The influence of various experimental parameters such as COD, colour, power consumption and mass flux were calculated and presented. Microbiological experiments were performed by bacteria which is isolated from textile outlet site soil. From the results, individual electro oxidation process maximum COD removal of about 80% and colour removal of 97.9% was achieved at an optimum current density of about 10.25 A/dm2 whereas bio-oxidation process reduced COD and colour removal of about 50% and 42.4% respectively. Integrated process reduced the COD and colour removal of 80% and 96.4% respectively at an optimum current density range of 6.84 A/dm2, whereas combined processes showed the COD and colour removal of 90% and 98.5% respectively at an optimized current density of 7.6 and 10.2 A/dm2. After post treatment the treated effluent can be reused.

► Combined and integrated technology for COD reduction of textile dye effluent. ► Integrated system gives better efficiency with less power consumption. ► The alternative technique to integrate electrochemical–biological treatment might be well accepted. ► Assessment of Microbial Degradation Capability by isolated bacterial strains.