Upgrading of an Extended Aeration System to Improve Wastewater Treatment


  • Mohamed Ayoub Associate Professor, Faculty of Engineering, Tanta University, Tanta, 31511, Egypt
  • Ahmed El-Morsy Associate Professor, Faculty of Engineering, Tanta University, Tanta, 31511, Egypt


Activated sludge, extended aeration, primary sedimentation, upgrade, wastewater treatment


According to this study, an extended aeration system can be upgraded by adding surface turbine aerators to the tanks and building new primary sedimentation tanks. Moreover, the biochemical oxygen demand (BOD5), chemical oxygen demand (COD), and total suspended solids (TSS) were also observed to be 440, 682, and 212 mg/L after primary settling, respectively. These values represent the removal of about 35% of the organic load and about 68% of the suspended solids, which reduces the organic load and sediments entering the secondary treatment. Furthermore, effluent BOD5, COD, and TSS values were 30, 47, and 32 mg/L respectively, while those permitted values are 60 mg/L of BOD5, 80 mg/L of COD, and 50 mg/L of TSS reflecting the success of the upgrading work.


. Baars, J. K. (1962). The use of oxidation ditches for treatment of sewage for small communities. Bulletin of the World Health Organization, 26(4), 465.‏

. Metcalf, E. (2003). Inc., wastewater engineering, treatment and reuse. New York: McGraw-Hill.‏

. Zhan, J. X., Ikehata, M., Mayuzumi, M., Koizumi, E., Kawaguchi, Y., & Hashimoto, T. (2013). An aeration control strategy for oxidation ditch processes based on online oxygen requirement estimation. Water science and technology, 68(1), 76-82.‏

. Yang, Y., Wu, Y., Yang, X., Zhang, K., & Yang, J. (2010). Flow field prediction in full-scale Carrousel oxidation ditch by using computational fluid dynamics. Water Science and Technology, 62(2), 256-265.‏

. Liu, Y., Shi, H., Xia, L., Shi, H., Shen, T., Wang, Z., ... & Wang, Y. (2010). Study of operational conditions of simultaneous nitrification and denitrification in a Carrousel oxidation ditch for domestic wastewater treatment. Bioresource technology, 101(3), 901-906.‏

. Fenu, A., Wambecq, T., de Gussem, K., & Weemaes, M. (2020). Nitrous oxide gas emissions estimated by liquid-phase measurements: robustness and financial opportunity in single and multi-point monitoring campaigns. Environmental Science and Pollution Research, 27(1), 890-898.‏

. Park, J., Kim, C., Hong, Y., Lee, W., Chung, H., Jeong, D. H., & Kim, H. (2020). Distribution and Removal of Pharmaceuticals in Liquid and Solid Phases in the Unit Processes of Sewage Treatment Plants. International journal of environmental research and public health, 17(3), 687.‏ ‏

. Pasveer, A. (1959). A contribution to the development in activated sludge treatment. J. Proc. Inst. Sewage Purif, 4, 436.‏

. Stensel, H. D., & Coleman, T. E. (2000). Technology Assessments: Nitrogen Removal Using Oxidation Ditches: Project 96-CTS-1. Water Environment Research Foundation.‏

. Fouad, M., & El-Morsy, A. (2012). Upgrade of a large scale oxidation ditch plant. Water Practice and Technology, 7(2).‏

. Moulick, S., Mal, B., & Bandyopadhyay, S. (2002). Prediction of aeration performance of paddle wheel aerators. Aquacultural Engineering, 25(4), 217-237.‏

. Thakre, S. B., Bhuyar, L. B., & Deshmukh, S. J. (2008). Effect of different configurations of mechanical aerators on oxygen transfer and aeration efficiency with respect to power consumption. International Journal of Aerospace and Mechanical Engineering, 2(2), 100-108.‏

. Thakre, S. B., Bhuyar, L. B., & Deshmukh, S. J. (2009). Oxidation ditch process using curved blade rotor as aerator. International Journal of Environmental Science & Technology, 6(1), 113-122.‏

. Han, Y., Yang, T., Yan, X., Li, L., & Liu, J. (2020). Effect of aeration mode on aerosol characteristics from the same wastewater treatment plant. Water research, 170, 115324.‏

. Abusam, A., Keesman, K. J., Spanjers, H., Van Straten, G., & Meinema, K. (2002). Effect of oxidation ditch horizontal velocity on the nitrogen removal process. Official Publication of the European Water Association (EWA), 6, 1-9.‏

. Fouad, M., & El-Morsy, A. (2014). Sludge accumulation pattern inside oxidation ditch case study. Water science and technology, 69(12), 2468-2475.‏ ‏

. Gresch, M., Armbruster, M., Braun, D., & Gujer, W. (2011). Effects of aeration patterns on the flow field in wastewater aeration tanks. Water research, 45(2), 810-818.‏

. Gillot, S., Capela, S., & Heduit, A. (2000). Effect of horizontal flow on oxygen transfer in clean water and in clean water with surfactants. Water Research, 34(2), 678-683.‏

. Banasiak, R., Verhoeven, R., De Sutter, R., & Tait, S. (2005). The erosion behaviour of biologically active sewer sediment deposits: observations from a laboratory study. Water Research, 39(20), 5221-5231.‏

. Insel, G., Artan, N., & Orhon, D. (2005). Effect of aeration on nutrient removal performance of oxidation ditch systems. Environmental engineering science, 22(6), 802-815.‏

. Pang, H., Shi, H., & Shi, H. (2009). Flow characteristic and wastewater treatment performance of a pilot-scale airlift oxidation ditch. Frontiers of Environmental Science & Engineering in China, 3(4), 470.

. Simon, S., Roustan, M., Audic, J. M., & Chatellier, P. (2001). Prediction of mean circulation velocity in oxidation ditch. Environmental technology, 22(2), 195-204.‏

. Hartley, K. J. (2008). Controlling sludge settleability in the oxidation ditch process. Water research, 42(6-7), 1459-1466.‏

. Li, H., Fang-ying, J., Wei-wei, Z., Xuan, X., Rui-hong, C., Na, L., & Xiao-ling, H. (2014). Deposition pattern, effect on nitrogen removal and component analysis of deposited sludge in a carrousel oxidation ditch. Desalination and Water Treatment, 52(31-33), 6079-6087.‏

. Mantziaras, I. D., & Katsiri, A. (2011). Reaction rate constants and mean population percentage for nitrifiers in an alternating oxidation ditch system. Bioprocess and biosystems engineering, 34(1), 57-65.‏

. Teeter, A. M. (2000). Clay-silt sediment modeling using multiple grain classes: Part I: settling and deposition. In Proceedings in Marine Science (Vol. 3, pp. 157-171). Elsevier.‏

. Schipper, L. A., Robertson, W. D., Gold, A. J., Jaynes, D. B., & Cameron, S. C. (2010). Denitrifying bioreactors—an approach for reducing nitrate loads to receiving waters. Ecological engineering, 36(11), 1532-1543.‏

. Vermande, S., Simpson, K., Essemiani, K., Fonade, C., & Meinhold, J. (2007). Impact of agitation and aeration on hydraulics and oxygen transfer in an aeration ditch: Local and global measurements. Chemical engineering science, 62(9), 2545-2555.‏

. Standard Methods. (2017). Standard methods for the examination of water and wastewater. 23rd ed., American Public Health Association, Washington, USA.




How to Cite

Ayoub, M. ., & El-Morsy, A. . (2021). Upgrading of an Extended Aeration System to Improve Wastewater Treatment. American Scientific Research Journal for Engineering, Technology, and Sciences, 81(1), 23–35. Retrieved from https://asrjetsjournal.org/index.php/American_Scientific_Journal/article/view/6983