Full-scale sequencing batch reactor (SBR) for domestic wastewater: Performance and diversity of microbial communities

► Real operational conditions (low dissolved oxygen) of a full-scale SBR. ► Characterization of microbial diversity in a full-scale SBR to improve operational conditions by molecular techniques. ► The greater activity found by DPAO microorganism (DPAO/PAO was 70%) not necessarily leads to phosphorou...

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Published in:	Bioresource technology Vol. 132; pp. 262 - 268
Main Authors:	Fernandes, Heloísa, Jungles, Mariele K., Hoffmann, Heike, Antonio, Regina V., Costa, Rejane H.R.
Format:	Journal Article
Language:	English
Published:	Kidlington Elsevier Ltd 01-03-2013 Elsevier
Subjects:	Applied sciences Bacteria Bacteria - genetics Bacteria - metabolism Bacteria - ultrastructure Biodiversity Biological and medical sciences Biological Oxygen Demand Analysis Biomass Bioreactors Biotechnology Brazil Decentralized system Denaturing Gradient Gel Electrophoresis DNA, Ribosomal - genetics Domestic Electrophoresis Euglypha Exact sciences and technology Flocculation Fundamental and applied biological sciences. Psychology In Situ Hybridization, Fluorescence Methods. Procedures. Technologies Microbial diversity Microorganisms Microscopy, Electron, Scanning Nitrobacter Nitrosomonas Nitrospira Oxygen demand Phosphorus - metabolism Pollution Reactors Sequencing Sequencing batch reactor Species Specificity Various methods and equipments Waste Disposal, Fluid - methods Waste water Wastewater Wastewaters Water Purification - methods Water treatment and pollution Brazil Microbial diversity Decentralized system Sequencing batch reactor Wastewater Domestic waste water Microorganism Biodiversity Microbial community Waste water
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Summary:	► Real operational conditions (low dissolved oxygen) of a full-scale SBR. ► Characterization of microbial diversity in a full-scale SBR to improve operational conditions by molecular techniques. ► The greater activity found by DPAO microorganism (DPAO/PAO was 70%) not necessarily leads to phosphorous removal. This work describes the performance and microbial diversity in a sequencing batch reactor of a decentralized full-scale system for urban wastewater treatment under limited aeration. The removal efficiency was: 83% for soluble chemical oxygen demand (SCOD), 60% for N–NH4+, 70% for total suspended solids (TSS) and 80% for volatile suspended solids (VSS). The biomass concentration had a maximum value around 8.7gVSSL−1 for organic load rate of 0.6gCODL−1d−1. The food/microorganism ratios showed average of 0.2gCOD/gVSSd. The sludge bacterial flocs were formed an irregular arrangement with organisms attached such as Euglypha sp. and pedunculate ciliates. It was observed the presence of Bacteria domains including Nitrosomonas spp., Nitrobacter spp., Nitrospira and C. “Accumulibacter” cluster. The DPAO activity was 70%. Denaturing gradient gel electrophoresis showed changes in ribotype number over biological treatment time among the groups observed being some are linked to nutrient removal. The reactor showed viability to treat domestic wastewater.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	0960-8524 1873-2976
DOI:	10.1016/j.biortech.2013.01.027