bathroom greywater treatment using advanced sequencing batch reactor (sbr)

greywater (i.e., discharges from shower, hand basin, bath, laundry and kitchen) accounts for up to 75% of the wastewater produced in households. it contains low concentrations of organic compounds, nutrients and pathogens compared to the more highly concentrated black water (toilet). therefore, it makes sense to collect greywater, treat it separately and re-use it for irrigation, infiltration, washing or other non-potable applications. the purpose of this study was to investigate the performance of an advanced sbr in the bathroom greywater treatment (in particular the detergent). for this purpose, a rectangular sbr reactor was used in a lab scale with a working volume of 12 liters. the primary microorganisms of this reactor were prepared from the active sludge return to the aeration pond of the arak municipal wastewater treatment plant. the reactor was fed with the effluent from the initial settling ponds of the same treatment plant. after the system was set up and sufficient microorganisms were grown, the exploitation phase began with synthetic greywater. the experiments were carried out in three cycles of 4, 6 and 8 hours. the concentrations of las, cod and bod₅ at the inlet were 6.8 mg/l, 385 mg/l and 170 mg/l, and in the outlet, 0.95 mg/l, 19.25 mg/l and 8.5 mg/l, in fact, in the 8-hour cycle, the removal efficiency were 86%, 93% and 95%, respectively.