High Rate Nutrient Removal in Fluidized Bed Biofilm Reactors
Authors: Ghylin, T. W.; Dempsey, M. J.
Source: Proceedings of the Water Environment Federation, Biofilms 2010 , pp. 614-621(8)
Publisher: Water Environment Federation
Abstract:The fluidized bed biofilm reactor (FBBR) has been used for anaerobic digestion, carbon oxidation, nitrification, and denitrification of industrial and municipal wastewaters. Most recently, it has been used at full-scale for municipal tertiary denitrification. In fact, the FBBR has the highest biomass density and smallest footprint of any tertiary treatment available for biological nitrate removal.The FBBR uses small media particles that are suspended in vertically flowing wastewater, so that the media becomes fluidized and the bed expands. The particles are in continuous relative motion but are not transported by the wastewater, which passes through the bed at a relatively high rate (30 to 50 m/h−1). Because the bed is expanded, it does not trap solids and therefore never requires backwashing. Ideally, the wastewater passes through in plug-flow mode with minimal backmixing, although most systems have some degree of recycle to maintain vertical velocity.A key feature of the FBBR is its high biomass density (up to 40,000 mg/L MLVSS) when compared with typical suspended growth systems. This high biomass concentration results in a volumetric efficiency that is typically 10 times higher than activated sludge systems. This unique characteristic makes the FBBR a cost effective solution, especially where space is limited.
Document Type: Research article
Publication date: 2010-01-01
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