Hydrodynamic study of a novel membrane aerated biofilm reactor (MABR): Tracer experiments and CFD simulation

摘要: The membrane-aerated biofilm reactor (MABR) is a promising technology for wastewater treatment, especially simultaneous organic and nitrogen removal. mass transfer phenomena induced by flow velocity pattern required in order to improve the design removal pollutants efficiency. Tracer experiments residence time distribution (RTD) theory were used characterize special MABR. liquid phase patterns investigated through tracer pulse stimulus-response technique using dextran blue as model tracer. RTD curves analyzed cold-model tests (axial dispersion ADM, tanks series TIS mixing cell MCM). detailed of was obtained from computational fluid dynamic (CFD) simulation. According experimental results studies CFD simulation, demonstrated be analogous completely mixed with deviations ideal hydrodynamic behavior; stagnant zones (low velocity) 85% its volume, being remainder channeling trouble (high velocity). These quantitatively described (macromixing level-global mixing) minimum quadratic error function value (S) 0.01. local (micromixing level) allowed determining location each zone; zone situated area where membranes are located; therefore it possible assume that degradation reactions would take place this area.