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Pilot Testing of Structured Sheet Media IFAS for Wastewater Biological Nutrient Removal (BNR)

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IFAS systems with various media have been increasingly implemented for enhanced nutrient removal. PVC structured sheet media have received little attention for IFAS applications despite their wide use for attached biomass retention in trickling filters. This pilot study was first conducted to evaluate the fabric media IFAS proposed for Springettsbury Township, Pennsylvania WWTP. Observations from the fabric media testing led to the following investigation of PVC structured sheet media IFAS to meet stringent nutrient limits.

The pilot results demonstrated that structured sheet media IFAS is capable of achieving complete nitrification with a surface nitrification rate of 0.88 g/m2-day. No media fouling was encountered. The unique shearing pattern from airlift pumping through structured sheet media creates thin and high-density biofilm for efficient oxygen and substrate mass transfer. The detrimental effects of red worm growth observed in this study with fabric media were not similarly observed with PVC structured sheet media.
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Keywords: Biological Nutrient Removal (BNR); Fabric Media; Integrated Fixed-Film Activated Sludge (IFAS); Nitrification; PVC Structured Sheet Media

Document Type: Research Article

Publication date: 2009-01-01

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