Wu, G., Rodgers, M. and Zhan, X.

2008

June

Biochemical Engineering Journal

Nitrification in sequencing batch reactors with and without glucose addition at 11o C

Published

()

ammonia oxidizing bacteria fluorescence in situ hybridization glucose heterotrophs nitrification IN-SITU HYBRIDIZATION AMMONIA-OXIDIZING BACTERIA NITRIFYING BACTERIA ACTIVATED-SLUDGE HETEROTROPHIC BACTERIA POPULATION-STRUCTURE RETENTION TIME BIOFILMS NITRIFIERS DYNAMICS

40

373

378

Nitrification was investigated in two laboratory-scale sequencing batch reactors (SBRs) at 11 degrees C, one with glucose addition (G-Reactor) and the other without (N-Reactor). The characteristics of nitrification and the distribution of ammonia oxidizing bacteria (AOB) within activated sludge floes in the two reactors were examined. A high specific nitrification rate existed in the N-Reactor, while a high volumetric nitrification rate existed in the G-Reactor. The proportion of AOB enriched in the N-Reactor was about three times that in the G-Reactor. The activated sludge floes in the N-Reactor had a larger floc size and a higher biomass density than in the G-Reactor. AOB were mainly in a form of clusters in the activated sludge floes in the N-Reactor, but were well dispersed throughout the floes in the G-Reactor. (C) 2008 Elsevier B.V. All rights reserved.

DOI 10.1016/j.bej.2008.01.010