Background: In this study, a hybrid treatment system (Fluidized Bed positioned in a biological reactor of an\nActivated Sludge process) was used to treat saline domestic wastewater. The performance of the mentioned hybrid\nsystem was compared with the conventional activated sludge. A pilot study was conducted, and Chemical Oxygen\nDemand (COD), Electrical Conductivity (EC), Total Dissolved Solids (TDS) and pH were measured to investigate\ntreatment efficiency. Three saline wastewater samples with salt concentrations of 0.5, 1, and 1.5 % and detention\ntimes of 2, 4 and 6 h were loaded into both rectors of hybrid system and activated sludge.\nResults: The results showed that Chemical Oxygen Demand (COD) removals at salt concentrations of 0.5, 1, 1.5 %\nwere equal to 80, 71, 48.5 for the hybrid system and 62, 47.7, 26.5 for the activated sludge system respectively.\nLikewise, similar results obtained for other contamination indices indicating the superiority of the hybrid system in\ncomparison to activated sludge system. Moreover, another advantage of the hybrid system was that the activated\nsludge needed sludge returning while sludge returning was not required in the hybrid system. In addition, by\nloading fixed rate of air into both systems, dissolved oxygen concentration in the hybrid reactor is higher than the\nconventional reactor.\nConclusions: Therefore, the hybrid system had a significantly higher efficiency than conventional reactor to treat\nsaline domestic wastewate
Loading....