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Bioresour Technol

Title:		Nitrate reduction by organotrophic Anammox bacteria in a nitritation/anammox granular sludge and a moving bed biofilm reactor
Author(s):		Winkler MK; Yang J; Kleerebezem R; Plaza E; Trela J; Hultman B; van Loosdrecht MC;
Address:		"Delft University of Technology, Department of Biotechnology, Julianalaan 65, 2628 BC Delft, The Netherlands"
Journal Title:		Bioresour Technol
Year:		2012
Volume:		20120329
Issue:
Page Number:		217 - 223
DOI:		10.1016/j.biortech.2012.03.070
ISSN/ISBN:		1873-2976 (Electronic) 0960-8524 (Linking)
Abstract:		"The effects of volatile fatty acids (VFAs) on nitrogen removal and microbial community structure in nitritation/anammox process were compared within a granular sludge reactor and a moving bed biofilm reactor. Nitrate productions in both systems were lower by 40-68% in comparison with expected nitrate production. Expected sludge production on VFAs was estimated to be 67-77% higher if heterotrophs were the main acetate degraders suggesting that Anammox bacteria used its organotrophic capability and successfully competed with general heterotrophs for organic carbon, which led to a reduced sludge production. FISH measurements showed a population consisting of mainly Anammox and AOB in both reactors and oxygen uptake rate (OUR) tests also confirmed that flocculent biomass consisted of a minor proportion of heterotrophs with a large proportion of AOBs. The dominant Anammox bacterium was Candidatus 'Brocadia fulgida' with a minor fraction of Candidatus 'Anammoxoglobus propionicus', both known to be capable of oxidizing VFAs"
Keywords:		"Bacteria, Anaerobic/classification/*metabolism Biofilms/*growth & development Bioreactors/*microbiology Equipment Design Equipment Failure Analysis Motion Nitrates/isolation & purification/*metabolism Quaternary Ammonium Compounds/isolation & purification;"
Notes:		"MedlineWinkler, Mari K H Yang, Jingjing Kleerebezem, Robbert Plaza, Elzbieta Trela, Jozef Hultman, Bengt van Loosdrecht, Mark C M eng Research Support, Non-U.S. Gov't England 2012/04/24 Bioresour Technol. 2012 Jun; 114:217-23. doi: 10.1016/j.biortech.2012.03.070. Epub 2012 Mar 29"