Evaluation of moving-bed biofilm sequencing batch reactor (MBSBR) in operating A2O process with emphasis on biological removal of nutrients existing in wastewater |
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| Authors: | M. Seyedsalehi J. Jaafari C. Hélix-Nielsen G. Hodaifa M. Manshouri S. Ghadimi H. Hafizi H. Barzanouni |
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| Affiliation: | 1.Department of Environmental Engineering, Science and Research Branch,Islamic Azad University,Tehran,Iran;2.Department of Environmental Health, School of Public Health,Guilan University of Medical Sciences,Rasht,Iran;3.Department of Environmental Engineering,Technical University of Denmark,Kgs. Lyngby,Denmark;4.Faculty of Chemistry and Chemical Engineering,University of Maribor,Maribor,Slovenia;5.Department of Molecular Biology and Biochemical Engineering, Chemical Engineering Area,University of Pablo de Olavide,Seville,Spain;6.The Chang School of Continuing Education,Ryerson University,Toronto,Canada;7.Department of Health & Safety Executive Engineering,Kar Higher Education Institute,Qazvin,Iran;8.Department of Chemistry,Isfahan University of Technology,Isfahan,Iran |
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| Abstract: | In this study, the performance of moving-bed biofilm sequencing batch reactor in operating the anaerobic/anoxic/oxic (A2O) process for treatment of wastewaters containing nitrogen and phosphorous was evaluated. For this purpose, a pilot system with two bench-scale sequencing batch reactors with a total volume of 30 L and functional volume of 10 L was used. The installation was elaborated using plexiglass, in which 60% of the functional volume consisted of PVC suspended carriers (Kaldnes K3) with a specific surface area of 560 m2/m3. The independent variables used in this study were hydraulic retention time (HRT) (1.5, 2, 2.5, 3, and 3.5 h) and the initial organic load (300, 500, 800, 1000 mg O2/L). The results showed impressive performance in the case of an initial organic load of 300 mg O2/L and HRT of 3 h with maximum removal of COD and TN, respectively, by 95.1 and 89.8%. In the case of an initial organic load of 1000 mg O2/L and HRT of 3.5 h, the maximum total phosphorus removal was 72.3%. Therefore, according to the analysis of data obtained by different HRTs, it was revealed that the system of A2O has greater efficiency in removing organic matter from wastewater in the shortest possible time. |
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