Water recovery and on-site reuse of laundry wastewater by a facile and cost-effective system: Combined biological and advanced oxidation process

Combined biological and physicochemical process was selected for treatment of laundry wastewater. The results show that after microbial adaptation, almost 91% of COD was removed at food to microorganism (F/M) ratio of 0.12 gBOD/gMLSS.d. Dehydrogenase activity of the biomass showed an increasing trend and finally reached 3.8 mu gTF/g(biomass).d corresponding to the highest process performance. 16SrRNA fragment and phylogenetic analysis identified Pseudomonas pharmacofabricae and Bacillus spp. as the dominant bacteria. The effluent of the biological process was then injected into the UV/O-3 process for complete removal of residual COD and detergent. Finally, miaofiltration and ultrafiltration were used to remove any remaining suspended solids. The operating cost analysis showed that 0.65 epsilon/m(3) treated wastewater is required for treatment of the laundry wastewater. Accordingly, the suggested combination of the biological and physicochemical process could be a promising and highly efficient process for treatment and reuse of laundry wastewater. (C) 2021 Elsevier B.V. All rights reserved.

Automated summary

The combined biological and physicochemical process efficiently removed COD and detergent from laundry wastewater, showing promising potential for treatment and reuse. This process utilized microbial adaptation, dehydrogenase activity, and identified dominant bacteria for improved performance. Operating cost analysis indicated the feasibility of the suggested approach.