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Effect of seed sludge microbial community and activity on the performance of anaerobic reactors during the start-up period.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Oz, N. A. Ince, O. Turker, G. Ince, B. K.
Description	Country affiliation: Turkey Author Affiliation: Oz NA ( Department of Environmental Engineering, Faculty of Engineering and Architecture, Canakkale Onsekiz Mart University, Terzioglu Campus, Canakkale, Turkey. nilgunayman@comu.edu.tr)
Abstract	In this study, two laboratory-scale anaerobic batch reactors started up with different inoculum sludges and fed with the same synthetic wastewater were monitored in terms of performance and microbial community shift by denaturant gradient gel electrophoresis fingerprinting and subsequent cloning, sequencing analysis in order to reveal importance of initial quality of inoculum sludge for operation of anaerobic reactors. For this purpose, two different seed sludge were evaluated. In Reactor1 seeded with a sludge having less diverse microbial community (19 operational taxonomic unit (OTU's) for Bacterial and 8 OTU's for Archaeal community, respectively) and a methanogenic activity of 150 ml CH(4) g TVS(-1) day(-1), a chemical oxygen demand (COD) removal efficiency of 78.8 ± 4.17% was obtained at a substrate to microorganism (S/X) ratio of 0.38. On the other hand, Reactor2, seeded with a sludge having a much more diverse microbial community (24 OTU's for Bacterial and 9 OTU's for Archaeal communities, respectively) and a methanogenic activity, 450 ml CH(4) g TVS(-1) day(-1), operated in the same conditions showed a better start-up performance; a COD removal efficiency of over 98% at a S/X ratio of 0.53. Sequence analysis of Seed2 revealed the presence of diverse fermentative and syntrophic bacteria, whereas excised bands of Seed1 related to fermentative and sulfate/metal-reducing bacteria. This study revealed that a higher degree of bacterial diversity, especially the presence of syntrophic bacteria besides the abundance of key species such as methanogenic Archaea may play an important role in the performance of anaerobic reactors during the start-up period.
File Format	HTM / HTML
ISSN	09593993
Issue Number	2
Volume Number	28
e-ISSN	15730972
Journal	World Journal of Microbiology and Biotechnology
Language	English
Publisher	Springer
Publisher Date	2012-02-01
Publisher Place	Germany
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Anaerobiosis Methane Research Support, Non-u.s. Gov't Discipline Microbiology Sewage Microbiology Bioreactors Waste Disposal, Fluid Metabolism Journal Article Discipline Biotechnology Denaturing Gradient Gel Electrophoresis
Content Type	Text
Resource Type	Article
Subject	Physiology Medicine Applied Microbiology and Biotechnology Biotechnology

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