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Nitric oxide preferentially inhibits nitrite oxidizing communities with high affinity for nitrite

Paper ID Volume ID Publish Year Pages File Format Full-Text
22976 43408 2015 3 PDF Available
Title
Nitric oxide preferentially inhibits nitrite oxidizing communities with high affinity for nitrite
Abstract

•NOB were partially inhibited with 2 μg NO-N L−1 in the liquid phase.•Both Nitrospira- as Nitrobacter-dominated sludge types could be inhibited by NO.•The degree of NO inhibition increased with the affinity for nitrite.•A lower NO inhibition was observed for sludge types with high specific NOB activity.

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 Nitrobacter/Nitrospira ratios. In an oxic bubbling column, a dosage of 4.4 mg NO L−1 d−1 (∼2 μg 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 (Ks) ranging from 0% to 30–50% and 60–80% inhibition of the nitrite oxidation for Ks 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.

Keywords
Activated sludge; Energy-positive; Greenhouse gases; Nitrifier intermediates; Nitrous oxide
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Nitric oxide preferentially inhibits nitrite oxidizing communities with high affinity for nitrite
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Biotechnology - Volume 193, 10 January 2015, Pages 120–122
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us