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This work was intended to study the effect of aeration cycle on efficiency of wastewater treatment in Sequencing Batch Reactor (SBR). Ratio of anaerobic to aerobic period was varied at 2:6, 4:4 and 6:2 using a total reaction time of 8 h/cycle. The sludge retention time (SRT) used in this study was 10 days; and synthetic wastewater had COD of 500 mg/l. The results showed that the sludge characteristics with short aeration time were compact and large flocs, and no stalked ciliates-protozoa were observed. The COD removal efficiencies under anaerobic to aerobic ratio of 2:6, 4:4 and 6:2 were 88, 91 and 94%, respectively. The ammonia removal efficiencies under anaerobic to aerobic ratio of 2:6, 4:4 and 6:2 were 75, 53 and 13% respectively. The effluents of nitrite and nitrate were 33, 21 and 3 mg/l, and 30, 14 and 2 mg/l for anaerobic to aerobic ratio of 2:6, 4:4 and 6:2 respectively. The results in this work suggested that the anaerobic to aerobic ratio of 6:2 was the most suitable condition for wastewater treatment in the SBR system.
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