Design characteristics of pooled circular stepped cascade aeration system |
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| Institution: | 1. Agricultural and Food Engineering Department, IIT Kharagpur, Kharagpur 721302, West Bengal, India;2. School of Civil Engineering, KIIT University, Bhubaneswar 751024, Odisha, India;1. Department of Social and Environmental Engineering, Graduate School of Engineering, Hiroshima University, 1-4-1 Kagamiyama, Higashihiroshima, Hiroshima 739-8527, Japan;2. Biomedical Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Central 6, Higashi 1-1-1, Tsukuba, Ibaraki 305-8566, Japan;3. Department of Environmental System Engineering, Nagaoka University of Technology, 1603-1 Kamitomioka, Nagaoka, Niigata 940-2188, Japan;4. Department of Civil Engineering, Gifu National College of Technology, 2236-2 Kamimakuwa, Motosu, Gifu 501-0495, Japan;5. Water and Soil Environmental Division, National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, Ibaraki 305-8506, Japan;1. Environmental Engineering program, The American University in Cairo (AUC), Cairo, Egypt;2. Department of Construction Engineering, The American University in Cairo (AUC), Cairo, Egypt;1. Institute of Agricultural Bio-Environmental Engineering, College of Bio-systems Engineering and Food Science, Zhejiang University, Hangzhou 310058, PR China;2. Department of Biological and Environmental Engineering, Cornell University, Riley Robb Hall, Ithaca, NY 14853, USA;1. School of Business, Society and Engineering, Mälardalen University, SE 721 23,Västerås, Sweden;2. Ningbo RX New Materials Tech. Co., Ltd. Ningbo 315200, China;3. School of Chemical Science and Engineering, Royal Institute of Technology, SE 100 44, Stockholm, Sweden |
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| Abstract: | Aeration experiments were conducted in a brick masonry tank of dimension 4 m × 4 m × 1.5 m to study the design characteristics of pooled circular stepped cascade (PCSC) aeration system. Based on dimensional analysis, non-dimensional numbers related to geometric, dynamic and process parameters were proposed. The non-dimensional geometric parameters – number of steps (N), ratio of total height of cascade (H) to the bottom radius of cascade (Rb), % coverage of circumference of each step by enclosure (Pe) and number of enclosures in each step (Ne) were optimized. Maintaining the optimized geometric parameters (N = 6, H/Rb = 0.25, Pe = 20% and Ne = 9), aeration experiments were further conducted at different discharges (Q) to develop simulation equations for prediction of aeration characteristics of PCSC aeration system at different dynamic conditions. Simulation equations for oxygen transfer and power consumption based on Froude (Fr) criterion were developed subject to 0.0014 ≤ Fr ≤ 0.0144. SAE of the developed prototype PCSC aerators based on estimated brake power ranged between 2.43 and 3.23 kg O2/kWh. |
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| Keywords: | Aeration Oxygen transfer Pooled circular stepped cascade Standard aeration efficiency |
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