摘要：Pilot scale studies were conducted to investigate the contribution of the flow rate and the influence of theconcentration on the function of upflow anaerobic sludge blanket (UASB) reactor in wastewater treatment ofdomestic greywater. In this study, the flowrates used were 2.5 L/hr, 1.67 L/hr, and 1.25 L/hr. On varying theconcentration, the optimum processing conditions were obtained in the reactor with a high concentration forthe efficiency reduction of biochemical oxygen demand (BOD) and chemical oxygen demand (COD) as1440 mg/L for the COD and 667.8 mg/L for the BOD, with an average reduction of 84.15% for BOD and76.32% for COD. Optimum efficiency of phosphate reduction was obtained in the reactor with the concentrationbeing 0.3843 mg/L with an average value of 72.58%. In general, the optimum conditions were obtained at thelowest flow rate of 1.25 L/hr for all the parameters and the efficiency decreased with the average values of83.32% for BOD, 73.31% for COD and 71.24% for the phosphate. The optimum values for the organicloading rate (OLR) of greywater was 8.71 kgCOD/m 3 .day with the optimum condition for the UASB reactorobserved at the highest flow rate of 2.5 L/hr, the highest concentration 1440 mg/L COD at the hydraulicretention time of 4 hours, with an upflow velocity of 0.051 m/hour and temperature of 35°C.
