title: Flow field prediction in full-scale Carrousel oxidation ditch by using computational fluid dynamics.
abstract: In order to optimize the flow field in a full-scale Carrousel oxidation ditch with many sets of disc aerators operating simultaneously, an experimentally validated numerical tool, based on computational fluid dynamics (CFD), was proposed. A full-scale, closed-loop bioreactor (Carrousel oxidation ditch) in Ping Dingshan Sewage Treatment Plant in Ping Dingshan City, a medium-sized city in Henan Province of China, was evaluated using CFD. Moving wall model was created to simulate many sets of disc aerators which created fluid motion in the ditch. The simulated results were acceptable compared with the experimental data and the following results were obtained: (1) a new method called moving wall model could simulate the flow field in Carrousel oxidation ditch with many sets of disc aerators operating simultaneously. The whole number of cells of grids decreased significantly, thus the calculation amount decreased, and (2) CFD modeling generally characterized the flow pattern in the full-scale tank. 3D simulation could be a good supplement for improving the hydrodynamic performance in oxidation ditch designs.
authors.affiliation: School of Environmental Science and Engineering, Huazhong University of Science and Technology (HUST), 1037 Luoyu Road, Wuhan, Hubei 430074, People's Republic of China.
authors.forename: Yin
authors.initials: Y
authors.lastname: Yang
authors.forename: Yingying
authors.initials: Y
authors.lastname: Wu
authors.forename: Xiao
authors.initials: X
authors.lastname: Yang
authors.forename: Kai
authors.initials: K
authors.lastname: Zhang
authors.forename: Jiakuan
authors.initials: J
authors.lastname: Yang
mesh_terms: D000332:Aerobiosis; D019149:Bioreactors; D003198:Computer Simulation; D008962:Models, Theoretical; D010084:Oxidation-Reduction; D014865:Waste Disposal, Fluid / Q000379:methods*