Title
Vertical migration of aggregated aerobic and anaerobic ammonium oxidizers enhances oxygen uptake in a stagnant water layer Vertical migration of aggregated aerobic and anaerobic ammonium oxidizers enhances oxygen uptake in a stagnant water layer
Author
Faculty/Department
Faculty of Sciences. Bioscience Engineering
Publication type
article
Publication
Berlin ,
Subject
Biology
Engineering sciences. Technology
Source (journal)
Applied microbiology and biotechnology. - Berlin, 1984, currens
Volume/pages
75(2007) :6 , p. 1455-1461
ISSN
0175-7598
ISI
000247463100028
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Abstract
Ammonium can be removed as dinitrogen gas by cooperating aerobic and anaerobic ammonium-oxidizing bacteria (AerAOB and AnAOB). The goal of this study was to verify putative mutual benefits for aggregated AerAOB and AnAOB in a stagnant freshwater environment. In an ammonium fed water column, the biological oxygen consumption rate was, on average, 76 kg O-2 ha(-1)day(-1). As the oxygen transfer rate of an abiotic control column was only 17 kg O-2 ha(-1) day(-1), biomass activity enhanced the oxygen transfer. Increasing the AnAOB gas production increased the oxygen consumption rate with more than 50% as a result of enhanced vertical movement of the biomass. The coupled decrease in dissolved oxygen concentration increased the diffusional oxygen transfer from the atmosphere in the water. Physically preventing the biomass from rising to the upper water layer instantaneously decreased oxygen and ammonium consumption and even led to the occurrence of some sulfate reduction. Floating of the biomass was further confirmed to be beneficial, as this allowed for the development of a higher AerAOB and AnAOB activity, compared to settled biomass. Overall, the results support mutual benefits for aggregated AerAOB and AnAOB, derived from the biomass uplifting effect of AnAOB gas production.
E-info
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