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Effective Biofilm Control on High Surface Density Vertical-Flow Structured Sheet Media for Submerged Applications

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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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Keywords: Aeration Mixing; Airlift Bioreactor; Biofilm Control; Integrated Fixed-Film Activated Sludge (IFAS); Vertical-Flow (VF) Structured Sheet Media

Document Type: Research Article

Publication date: 2010-01-01

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