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J Appl Microbiol

Title:		Bacterial community dynamics during reduction of odorous compounds in aerated pig manure slurry
Author(s):		Hanajima D; Haruta S; Hori T; Ishii M; Haga K; Igarashi Y;
Address:		"Pollution Control Research Team, National Institute of Livestock and Grassland Science, Tsukuba, Ibaraki, Japan. hanadi@affrc.go.jp"
Journal Title:		J Appl Microbiol
Year:		2009
Volume:		20081219
Issue:		1
Page Number:		118 - 129
DOI:		10.1111/j.1365-2672.2008.03984.x
ISSN/ISBN:		1365-2672 (Electronic) 1364-5072 (Linking)
Abstract:		"AIMS: To study the microbial community responsible for the reduction of the polluting load during aerobic digestion of pig slurry. METHODS AND RESULTS: We analysed bacterial succession by nonculture-based methods and determined the physicochemical parameters and polluting substances during 6 days of aerobic digestion. The bacterial subpopulations evolved by aeration, predominantly Bacillus spp., degraded organic matter and vigorously consumed oxygen, as indicated by low oxidation-reduction potential (ORP). In this phase, the volatile fatty acid (VFA) levels drastically decreased, and VFAs were almost depleted on day 4. Simultaneously, the ammonia concentration decreased to its lowest level on day 4; thereafter, it increased until the end of the process. After the decrease in the total organic carbon content in the supernatant of the decomposed slurry, the ORP increased (approximately 0 mV), and the microbial community showed an abundance of lineages belonging to the phylum Proteobacteria. CONCLUSIONS: Bacillus was the predominant member of the bacterial community driving the VFA-removal process. Their predominance was related to the presence of available carbon, including VFAs and changes in ORP. SIGNIFICANCE AND IMPACT OF THE STUDY: Information on the relationships among the involved microbes, polluting materials and physicochemical parameters will aid process design and retrofitting of the process"
Keywords:		"Aerobiosis/physiology Animals Bacteria/*isolation & purification/metabolism *Biodegradation, Environmental Colony Count, Microbial Escherichia coli/growth & development/metabolism Manure/analysis/*microbiology Nitrates/*analysis Nitrogen/*analysis Polymer;"
Notes:		"MedlineHanajima, D Haruta, S Hori, T Ishii, M Haga, K Igarashi, Y eng Research Support, Non-U.S. Gov't England 2009/01/06 J Appl Microbiol. 2009 Jan; 106(1):118-29. doi: 10.1111/j.1365-2672.2008.03984.x. Epub 2008 Dec 19"