Publication
Title
Nitric oxide preferentially inhibits nitrite oxidizing communities with high affinity for nitrite
Author
Abstract
The prerequisite to the development success of the novel mainstream processes partial nitritation/anammox is the out-selection of nitrite oxidizing bacteria (NOB). A recent study suggested that this could be achieved through NO production by ammonium oxidizing bacteria under cyclic oxic-anoxic conditions. Indeed, it is known that among NOB, Nitrobacter species are reversibly inhibited by NO. However, the effect of NO on the activity of the NOB genus Nitrospira is not studied so far. Such an understanding is needed, since Nitrospira related NOB are mostly prevailing in sewage treatment plants. This study quantified the effect of NO on the nitratation activity of sludge types with different Nitro bacter/Nitrospira ratios. In an oxic bubbling column, a dosage of 4.4 mg NO L-1 d(-1) (similar to 2 mu g NO-N L-1 in liquid phase) inhibited the Nitrobacter dominated sludge with 24%. For the Nitrospira dominated sludge types, the inhibition was strongly correlated with the nitrite half saturation constant (K-s) ranging from 0% to 30-50% and 60-80% inhibition of the nitrite oxidation for K-s of 0.72, 0.36 and 0.06 mg NO2- -N L-1, respectively. This study showed that nitrifying communities with high affinity for nitrite and low specific nitrite oxidation rates (K-strategists) can be strongly inhibited by NO. The degree of inhibition could be confirmed in a set-up with NO dosage through an artificial alginate-based biofilm, ensuring a more direct contact between NO and the microorganisms. (C) 2014 Elsevier B.V. All rights reserved.
Language
English
Source (journal)
Journal of biotechnology. - Amsterdam
Publication
Amsterdam : 2015
ISSN
0168-1656
Volume/pages
193(2015), p. 120-122
ISI
000346826800019
Full text (Publisher's DOI)
Full text (publisher's version - intranet only)
UAntwerpen
Faculty/Department
Research group
[E?say:metaLocaldata.cgzprojectinf]
Publication type
Subject
External links
Web of Science
Record
Identification
Creation 09.02.2015
Last edited 27.07.2017