Simultaneous Nitrification and Denitrification in Wastewater Treatment by Sequencing Batch Reactor (SBR) without External Carbon Source

Document Type : Research Article


1 Department of Environmental Engineering, Science and Research Branch, Islamic Azad University, Tehran, I.R. IRAN

2 Environmental Technologies Research Center, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, I.R. IRAN


Nitrogen removal in Sequencing Batch Reactor (SBR) was studied. No external carbon source was added to the reactor. Step feeding process with an influent flow distribution was carried out to evaluate nitrogen removal from synthetic wastewater. Complete nitrification and denitrification were promoted while the reactor operated under Carbon/Nitrogen (C/N) ratio of 12.5 and Hydraulic Retention Time (HRT) of 1.47 d. The probabilities of values (p-value) of the results (0.31, 0.27 and 0.27) were used to test normal data distribution. Furthermore, P-values of the results were utilized in the analysis of variance and it was found that the results of the reactor operation with two times of carbon source addition, which had the best nitrogen removal efficiency, were significantly different. Generally, the reactor was operated at six different loading rates including 3 OLRs and 3 NLRs. The results showed that nitrogen removal efficiency of 91% could be achieved in SBR with two times of internal carbon source addition. The effluent concentrations of nitrogen compounds during the operation at different NLRs were below the standard levels.


Main Subjects

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