This study was undertaken to investigate the mixing characteristics and establish aeration mixing criteria for a Vertical-Flow (VF) structured sheet media system. The results demonstrated that the optimized airlift pumping associated with the VF media system using fine bubble diffusers
is capable of achieving effective biofilm control for enhanced process performance. The media scouring velocities of 0.1-0.3 ft/sec obtained at aeration mixing criteria of 0.5-1.0 SCFM/ft2-media plan view has been shown sufficient for the excessive biomass control in typical
municipal IFAS retrofits. The identified scouring air requirements are often exceeded by the process air demand for the upgrade of a conventional activated sludge plant. Tapered aeration has been commonly implemented in the full-scale facilities, enabling a lower mixing air requirement and
providing process kinetic benefits and energy savings. Engineering design parameters other than aeration as integrated in the VF media system for effective mixing were also discussed in the paper.
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