Please use this identifier to cite or link to this item: http://hdl.handle.net/1822/1541

TitleHydraulic characteristics of an anoxic rotating biological contactor: influence of biofilm
Author(s)Teixeira, P.
Alves, M. M.
Oliveira, Rosário
KeywordsRotating biological contactor
Residence time distribution
Dispersion model
Dead space
diffusivity
Issue date2001
PublisherSelper
JournalEnvironmental Technology
Citation"Environmental technology". ISSN 1520-4081. 22 (2001) 1169-1175.
Abstract(s)The hydraulic characteristics of an anoxic rotating biological contactor were studied under different flow rates. The experiments were carried out with the reactor clean (without biomass) and containing denitrifying biofilm (Alcaligenes denitrificans) covering the disks. Residence Time Distribution (RTD) experiments were performed by the stimulus-response technique using lithium chloride as tracer. Experiments without biomass revealed the existence of hydraulic dead volumes (around 40% for hydraulic residence time of 0.94 and 2 hours) that occur in corners, where stagnant eddies form. When in normal operation, with the disks covered by biofilm and with biogas production, these values decreased significantly. For hydraulic residence time (HRT) of 2 hours a minimum dead volume was observed, being appropriate to run the reactor under this condition, from the hydraulic viewpoint. The Dispersion number decreased with increasing HRT from 0.94 h on, for both types of experiment, without, and in the presence of biomass. For this HRT the dispersion number was maximal in both situations. A considerable diffusion of tracer into the biofilm was detected, being faster in the more hydrated biofilm, and justifying the long tails observed in the RTD experimental curves.
TypeArticle
URIhttp://hdl.handle.net/1822/1541
ISSN1520-4081
1522-7278
Peer-Reviewedyes
AccessOpen access
Appears in Collections:CEB - Publicações em Revistas/Séries Internacionais / Publications in International Journals/Series

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