title: CFD simulation of mechanical draft tube mixing in anaerobic digester tanks.
abstract: Computational Fluid Dynamics (CFD) was used to simulate the mixing characteristics of four different circular anaerobic digester tanks (diameters of 13.7, 21.3, 30.5, and 33.5m) equipped with single and multiple draft impeller tube mixers. Rates of mixing of step and slug injection of tracers were calculated from which digester volume turnover time (DVTT), mixture diffusion time (MDT), and hydraulic retention time (HRT) could be calculated. Washout characteristics were compared to analytic formulae to estimate any presence of partial mixing, dead volume, short-circuiting, or piston flow. CFD satisfactorily predicted performance of both model and full-scale circular tank configurations.
authors.affiliation: Civil and Environmental Engineering Department, Colorado State University, 6218 Eagle Ridge Court, Fort Collins, CO 80523, USA. robert.meroney@colostate.edu
authors.forename: Robert N
authors.initials: RN
authors.lastname: Meroney
authors.forename: P E
authors.initials: PE
authors.lastname: Colorado
mesh_terms: D000693:Anaerobiosis; D019149:Bioreactors; D003198:Computer Simulation; D004867:Equipment Design; D007700:Kinetics; D008962:Models, Theoretical; D012722:Sewage; D014865:Waste Disposal, Fluid / Q000295:instrumentation* / Q000379:methods*
chemical_list: D012722:Sewage