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Author(s): Regina Nogueira
Luis F. Melo
Ulrike Pulrkhold
Stefan Wuertz
Michael Wagner
Title: Nitrifying and heterotrophic population dynamics in biofilm reactors: effects of hydraulic retention time and the presence of organic carbon
Issue Date: 2002
Abstract: Two biofilmreactors operated with hydraulic retention times of 0.8 and 5.0 h were used to study the links betweenpopulation dynamics and reactor operation performance during a shift in process operation from pure nitrification tocombined nitrification and organic carbon removal. The ammonium and the organic carbon loads were identical forboth reactors. The composition and dynamics of the microbial consortia were quantified by fluorescence in situhybridization (FISH) with rRNA-targeted oligonucleotide probes combined with confocal laser scanning microscopy,and digital image analysis. In contrast to past research, after addition of acetate as organic carbon nitrificationperformance decreased more drastically in the reactor with longer hydraulic retention time. FISH analysis showed thatthis effect was caused by the unexpected formation of a heterotrophic microorganism layer on top of the nitrifyingbiofilm that limited nitrifiers oxygen supply. Our results demonstrate that extension of the hydraulic retention timemight be insufficient to improve combined nitrification and organic carbon removal in biofilm reactors.
Document Type: Artigo em Revista Científica Internacional
Rights: openAccess
Appears in Collections:FEUP - Artigo em Revista Científica Internacional

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