The Inhibitory Effects of Free Nitrous Acid on the Energy Generation and Growth Processes of an EnrichedNitrobacterCulture

2006 ◽  
Vol 40 (14) ◽  
pp. 4442-4448 ◽  
Author(s):  
Vel M. Vadivelu ◽  
Zhiguo Yuan ◽  
Christian Fux ◽  
Jurg Keller
Keyword(s):  
Nitrous Acid ◽  
Energy Generation ◽  
Inhibitory Effects ◽  
Growth Processes ◽  
Free Nitrous Acid

Free ammonia and free nitrous acid inhibition on the anabolic and catabolic processes of Nitrosomonas and Nitrobacter

2007 ◽  
Vol 56 (7) ◽  
pp. 89-97 ◽  
Author(s):  
V.M. Vadivelu ◽  
J. Keller ◽  
Z. Yuan
Keyword(s):  
Nitrous Acid ◽  
Energy Production ◽  
Inhibitory Effect ◽  
Free Ammonia ◽  
Fish Analysis ◽  
Batch Reactors ◽  
Inhibitory Effects ◽  
Free Nitrous Acid ◽  
Production Capability ◽  
Batch Tests

The inhibitory effects of free ammonia (FA) and free nitrous acid (FNA) on the catabolic and anabolic processes of Nitrosomonas and Nitrobacter were investigated using a method that allows decoupling the growth and energy generation processes. Lab-scale sequencing batch reactors (SBRs) were operated for the enrichment of Nitrosomonas and Nitrobacter. Fluorescent In-Situ Hybridization (FISH) analysis showed that the reactors were 82% and 73% enriched with Nitrosomonas and Nitrobacter, respectively. Batch tests were carried out to measure the oxygen uptake rate (OUR) by the enriched cultures at various FA and FNA levels, in the presence (OURwithCO2) or absence (OURwithoutCO2) of inorganic carbon (CO2, HCO3− and CO32−). FA up to 16.0 mgNH3-N.L−1 was not found to have any inhibitory effect on either the catabolic or anabolic processes of the Nitrosomonas culture, but both these processes were inhibited by FNA. While an FNA level of 0.40–0.63 mgHNO2-N.L−1 inhibited the energy production capability of Nitrosomonas by 50%, the growth process of the culture was completely inhibited by FNA at a concentration of 0.40 mgHNO2-N.L−1. Both FA and FNA were found to have strong inhibition on the anabolic processes of Nitrobacter, but with limited inhibitory effects on the catabolism of this culture. The biosynthesis of Nitrobacter was totally inhibited at an FA level of 6.0 mgNH3-N.L−1 (or above) or an FNA level of 0.02 mgHNO2-N.L−1 (or above). At the same level of FA, the energy production capability of Nitrobacter was only inhibited by 12%, whereas an FNA level of up to 0.024 mgHNO2-N.L−1 did not show any inhibition on the energy production of Nitrobacter. Further, these inhibitory effects appears to be much stronger on Nitrobacter than on Nitrosomonas, supporting that FA and FNA inhibition may play a major role in the elimination of nitrite oxidizing bacteria in processes treating wastewater containing a high level of nitrogen.

Could nitrite/free nitrous acid favour GAOs over PAOs in enhanced biological phosphorus removal systems?

2011 ◽  
Vol 63 (2) ◽  
pp. 345-351 ◽  
Author(s):  
M. Pijuan ◽  
L. Ye ◽  
Z. Yuan
Keyword(s):  
Phosphorus Removal ◽  
Nitrous Acid ◽  
Wastewater Treatment Plants ◽  
Enhanced Biological Phosphorus Removal ◽  
Biological Phosphorus Removal ◽  
Inhibitory Effects ◽  
Nitrogen Gas ◽  
Free Nitrous Acid ◽  
Polyphosphate Accumulating Organisms ◽  
Biological Phosphorus

Enhanced biological phosphorus removal (EBPR) normally occurs together with nitrogen removal in wastewater treatment plants (WWTPs). In recent years, efforts have been devoted to remove nitrogen via the nitrite pathway (oxidation of ammonia to nitrite and reduction of nitrite to nitrogen gas without going through nitrate), reducing the requirement for carbon and oxygen in the plant. However nitrite and free nitrous acid (FNA), the protonated species of nitrite, have been shown to cause EBPR deterioration under certain concentrations. This study provides a direct comparison between the different levels of FNA inhibition in the aerobic processes of polyphosphate accumulating organisms (PAOs) and glycogen accumulating organisms (GAOs) by reviewing the studies published in this area. Also, new data is presented assessing the FNA effect on the anaerobic metabolism of these two groups of bacteria. Overall, FNA has shown inhibitory effects on most of the processes involved in the metabolism of PAOs and GAOs. However, the inhibition-initiation levels are different between different processes and, even more importantly between the two groups. In general, PAOs appear to be more affected than GAOs at the same level of FNA, thus giving GAOs competitive advantage over PAOs in EBPR systems when nitrite is present.

scholarly journals Free nitrous acid inhibition on carbon storage microorganisms: Accumulated inhibitory effects and recoverability

2016 ◽  
Vol 287 ◽  
pp. 285-291 ◽  
Author(s):  
Lily Ganda ◽  
Yan Zhou ◽  
Choon-Ping Lim ◽  
Yu Liu ◽  
Wun Jern Ng
Keyword(s):  
Carbon Storage ◽  
Nitrous Acid ◽  
Acid Inhibition ◽  
Inhibitory Effects ◽  
Free Nitrous Acid

Combined hydrothermal and free nitrous acid, alkali and acid pretreatment for biomethane recovery from municipal sludge

2021 ◽  
Vol 131 ◽  
pp. 376-385
Author(s):  
Farokh laqa Kakar ◽  
Neha Purohit ◽  
Frances Okoye ◽  
Steven N. Liss ◽  
Elsayed Elbeshbishy
Keyword(s):  
Nitrous Acid ◽  
Municipal Sludge ◽  
Acid Pretreatment ◽  
Free Nitrous Acid

Achieving nitritation by treating sludge with free nitrous acid: The effect of starvation

2019 ◽  
Vol 271 ◽  
pp. 159-165 ◽  
Author(s):  
Xi Nan ◽  
Bin Ma ◽  
Wenting Qian ◽  
Hongbo Zhu ◽  
Xiyao Li ◽  
...  
Keyword(s):  
Nitrous Acid ◽  
Free Nitrous Acid

Study of free nitrous acid (FNA)-based elimination of sulfamethoxazole: Kinetics, transformation pathways, and toxicity assessment

2021 ◽  
Vol 189 ◽  
pp. 116629
Author(s):  
Zhao Cheng ◽  
Zhiqiang Zuo ◽  
Shaolin Yang ◽  
Zhiguo Yuan ◽  
Xia Huang ◽  
...  
Keyword(s):  
Nitrous Acid ◽  
Toxicity Assessment ◽  
Free Nitrous Acid ◽  
Transformation Pathways
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