Determination of Ammonia Oxidation Rate in Sub- and Supercritical Water

2002 ◽  
Vol 41 (24) ◽  
pp. 6020-6027 ◽  
Author(s):  
Nathalie Segond ◽  
Yukihiko Matsumura ◽  
Kazuo Yamamoto
Keyword(s):  
Supercritical Water ◽  
Oxidation Rate ◽  
Ammonia Oxidation ◽  
Ammonia Oxidation Rate

Ammonia Oxidizing Bacteria (AOB) kinetic parameters estimated using the actual maximum ammonia oxidation rate

2020 ◽  
Vol 147 ◽  
pp. 104876
Author(s):  
Alberto Mannucci ◽  
Cecilia Caretti ◽  
Iacopo Ducci ◽  
Claudio Lubello ◽  
Riccardo Gori ◽  
...  
Keyword(s):  
Kinetic Parameters ◽  
Oxidation Rate ◽  
Ammonia Oxidation ◽  
Ammonia Oxidizing Bacteria ◽  
Ammonia Oxidation Rate

scholarly journals Influence of ammonia oxidation rate on thaumarchaeal lipid composition and the TEX86 temperature proxy

2016 ◽  
Vol 113 (28) ◽  
pp. 7762-7767 ◽  
Author(s):  
Sarah J. Hurley ◽  
Felix J. Elling ◽  
Martin Könneke ◽  
Carolyn Buchwald ◽  
Scott D. Wankel ◽  
...  
Keyword(s):  
Water Column ◽  
Oxidation Rate ◽  
Nutrient Dynamics ◽  
Ammonia Oxidation ◽  
Membrane Lipids ◽  
Reducing Power ◽  
Archaeal Community ◽  
Surface Mixed Layer ◽  
Culture Methods ◽  
Ammonia Oxidation Rate

Archaeal membrane lipids known as glycerol dibiphytanyl glycerol tetraethers (GDGTs) are the basis of the TEX86 paleotemperature proxy. Because GDGTs preserved in marine sediments are thought to originate mainly from planktonic, ammonia-oxidizing Thaumarchaeota, the basis of the correlation between TEX86 and sea surface temperature (SST) remains unresolved: How does TEX86 predict surface temperatures, when maximum thaumarchaeal activity occurs below the surface mixed layer and TEX86 does not covary with in situ growth temperatures? Here we used isothermal studies of the model thaumarchaeon Nitrosopumilus maritimus SCM1 to investigate how GDGT composition changes in response to ammonia oxidation rate. We used continuous culture methods to avoid potential confounding variables that can be associated with experiments in batch cultures. The results show that the ring index scales inversely (R2 = 0.82) with ammonia oxidation rate (ϕ), indicating that GDGT cyclization depends on available reducing power. Correspondingly, the TEX86 ratio decreases by an equivalent of 5.4 °C of calculated temperature over a 5.5 fmol·cell−1·d−1 increase in ϕ. This finding reconciles other recent experiments that have identified growth stage and oxygen availability as variables affecting TEX86. Depth profiles from the marine water column show minimum TEX86 values at the depth of maximum nitrification rates, consistent with our chemostat results. Our findings suggest that the TEX86 signal exported from the water column is influenced by the dynamics of ammonia oxidation. Thus, the global TEX86–SST calibration potentially represents a composite of regional correlations based on nutrient dynamics and global correlations based on archaeal community composition and temperature.

Kinetic study of compost liquor nitrification

2011 ◽  
Vol 63 (5) ◽  
pp. 868-876 ◽  
Author(s):  
J. Gagnaire ◽  
X. Y. Wang ◽  
L. Chapon ◽  
P. Moulin ◽  
B. Marrot
Keyword(s):  
Activated Sludge ◽  
Oxidation Rate ◽  
Industrial Wastewater ◽  
Ammonia Oxidation ◽  
Industrial Effluent ◽  
The Real ◽  
Haldane Model ◽  
Real Wastewater ◽  
Ammonia Oxidation Rate ◽  
Ammonia Oxidising Bacteria

This study is a first kinetic approach about the compost liquor treatment by activated sludge. This industrial wastewater is highly loaded in organic and nitrogen compounds (COD≈12,000 mg L−1 and NH4+-N≈4,000 mg L−1). The possibility of its treatment in an urban WWTP is studied measuring ammonia oxidation rate with non-acclimated sludge to the industrial effluent. Compost liquor appears as an inhibitor substrate. The ammonia oxidation rate can be modelled by the Haldane model: UMAX=0.180 d−1, KS=12.0 mgN.L−1 and KI=26.0 mgN.L−1. The ammonia oxidation rate also follows for a synthetic substrate which has the same pollutant load as the real substrate. In this case, the ammonia oxidation rate can be modelled by the Monod model: UMAX=0.073 d−1 and KS=4.3 mgN.L−1. This result confirms that the ammonia oxidising bacteria are inhibited by the real wastewater. The following-up of nitrate production shows also the inhibition of nitrite oxidising bacteria. The compost liquor treatment seems not possible in an urban WWTP (<50,000 p.e.). That’s why a specific WWTP is recommended and an acclimation step of activated sludge is essential.

Phylogenetic and Microbial Community Analysis Based on amoA Gene and 16SrDNA in Nitrosification Biofilm Reactor

2011 ◽  
Vol 183-185 ◽  
pp. 1051-1056
Author(s):  
Tao Liu ◽  
Dong Li ◽  
Jie Zhang
Keyword(s):  
Microbial Community ◽  
Oxidation Rate ◽  
Ammonia Oxidation ◽  
Community Analysis ◽  
Biofilm Reactor ◽  
Microbial Community Analysis ◽  
Gene Encoding ◽  
Gene Libraries ◽  
Key Factor ◽  
Ammonia Oxidation Rate

In order to analyze microbial community and phylogenesis in nitrosification biofilm reactor, a partial stretch of the gene encoding the active-site polypeptide of ammonia monooxygenase (amoA) was amplified and the gene libraries were constructed. The result of gene sequences and phylogenetic analysis showed that Nitrosomonas eutropha was the predominant species in the reactor. Besides, there were also some kinds of ammonia-oxidizing microbe uncultured in the system. PCR-SSCP analysis of 16SrDNA of archaebacteria and eubacterium indicated that with the rising of ammonia oxidation rate, the structure and distribution of microbial community was influenced and the diversity of microbial communities decreased, and the decreasing of specificity in the reactor might be the key factor for the rising of ammonia oxidation rate.

The influence of trace NO2 on the kinetics of ammonia oxidation and the characteristics of nitrogen removal from wastewater

2010 ◽  
Vol 62 (5) ◽  
pp. 1037-1044 ◽  
Author(s):  
Daijun Zhang ◽  
Qing Cai ◽  
Bo Zu ◽  
Cui Bai ◽  
Ping Zhang
Keyword(s):  
Nitrogen Removal ◽  
Oxidation Rate ◽  
Ammonia Oxidation ◽  
Batch Reactor ◽  
Synthetic Wastewater ◽  
Ammonia Oxidizing Bacteria ◽  
Oxidation Activity ◽  
Batch Tests ◽  
Denitrification Activity ◽  
Ammonia Oxidation Rate

Ammonia oxidizing bacteria-enriched sludge was obtained in a sequencing batch reactor with synthetic wastewater. Batch tests of ammonia oxidation were carried out with the sludge, in the presence of only trace NO2 and in the presence of O2 and trace NO2, respectively. The Andrews model is used to describe NO2-dependent ammonia oxidation. The maximum ammonia oxidation rate of 139.11 mg N·(g sludge COD h)−1, occurred in the presence of 21% O2 and 100 ppm NO2, which was 3 times higher than the aerobic ammonia oxidation rate without NO2. The kinetic model of ammonia oxidation in the presence of O2 and trace NO2 is developed, and the function of NO2 apparently enhancing ammonia oxidation is suggested. The maximal nitrogen removel of 34.19% occurred at the 21% O2 and 100 ppm NO2 in the mixed gases. Nitrogen removal principally depended on the denitrification activity and NO2-dependent ammonia oxidation activity of ammonia-oxidizing bacteria (AOB).

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