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Please use this identifier to cite or link to this item: http://hdl.handle.net/10373/205

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Title: Structural analysis of anaerobic granules in a phase separated reactor by electron microscopy
Authors: Baloch, M. I.
Akunna, Joseph C.
Kierans, M.
Collier, Phillip J.
Affiliation: University of Abertay Dundee. School of Contemporary Sciences
Keywords: Anaerobic granular sludge
Electron microscopy
Phase separation
Acidogenesis
Methanogenesis
Issue Date: Mar-2008
Publisher: Elsevier Science B.V., Amsterdam
Type: Journal Article
Refereed: peer-reviewed
Rights: Published version (c)Elsevier Science B.V., Amsterdam, available from DOI: 10.1016/j.biortech.2007.03.016
Citation: Baloch, M. I., et al. 2008. Structural analysis of anaerobic granules in a phase separated reactor by electron microscopy. Bioresource Technology. 99(5): pp.922-929. [Online] Available from: DOI: 10.1016/j.biortech.2007.03.016
Abstract: This paper discusses the microbial community structure of anaerobic granules and the effect of phase separation in anaerobic reactor on the characteristics of granules. Electron micrographs revealed that the core of anaerobic granular sludge consists predominantly of Methanosaeta-like cells, a key microorganism in granulation process. Granules in the methanogenic dominant zone of the reactor were stable and densely packed with smooth regular surface. On the other hand, granules subjected to acidogenic activities were less stable structures with broken parts and an irregular fissured surface. Anaerobic granules consisted of a vast diversity of species from the outer surface to the core of the granule and possessed a multi-layered structure. Viruses in the granules suggests the presence of bacteriophage in the granular biomass. These could be responsible for destroying cells and weakening the internal structure of granules, and thus possibly causing the breaking of granules. The observation of protozoa-like microorganism on the exterior zone of granular structure is believed to play an important role as bacterial predator and control the growth of bacterial cells. The images observed in this study shows that anaerobic granule harbour diverse number of microbial species, and act differently in acidogenic and methanogenic microbial zones
URI: http://hdl.handle.net/10373/205
ISSN: 0960-8524
Appears in Collections:Science Engineering & Technology Collection

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