A Study on the Wastewater Treatment Plant using a Combined Activated Sludge and Filtration : Part 1-Analyses on the Treatment Performance of Domestic Wastewater

Abstract

A wastewater treatment plant (Aerated Filter), combined with the operational advantages of complex-media filter and the efficiency of activated sludge, was designed to give an effluent with good quality for reuse of recycled wastewater, providing consistent and relatively maintenance-free service. In this study, the experiments on the performance in the treatment of the plant were conducted, using pilot and full-scale treatment facilities. The results revealed that the quality of treated water was not dependent on activated sludge characteristics, the amount of the treated water was linear to the square root of water head of filtration, and the average reductions in COD and BOD across the facilities were 98 and 85%, respectively. In addition, it was found that COD and BOD were mostly reduced in the upper of the filtration bed, however, those were also reduced in the lower on the case of the load being placed in that, and the quality of treated water was dependent on soluble COD which was included in the aeration zone.