Denitrification. Medical search. Frequent questions

The first AOM-D that has been proposed is based on methane oxidation/denitrification by methanotrophs or syntrophic reaction between methanotrophs and denitrifying bacteria. (uwaterloo.ca)

Biological nitrogen removal from wastewater is conventionally performed via nitrification and denitrification processes. (iwaponline.com)
Biological processes used for nitrification and denitrification of saline wastewater results in low treatment efficiencies because of plasmolysis or loss of activity of organisms in the presence of salt. (deu.edu.tr)
Biological nitrification and denitrification of synthetic wastewater containing different concentrations of salt were investigated in this study. (deu.edu.tr)
Salt concentrations above 2% resulted in significant reductions in performances of both nitrification and denitrification. (deu.edu.tr)
The five processes in the nitrogen cycle - fixation, uptake, mineralization, nitrification, and denitrification - are all driven by microorganisms. (visionlearning.com)
four micro-oxygen reactors (zones O1-O4) were used for simultaneous partial nitrification and denitrification through low-dissolved oxygen gradient control, step-feed, and swine wastewater-digested swine wastewater distribution. (bvsalud.org)
effluent total nitrogen, 53 ± 19 mg/L). Mass balance coupled with quantitative polymerase chain reaction analysis revealed that simultaneous partial nitrification and denitrification was achieved in four micro-oxygen zones. (bvsalud.org)

Denitrification in sediment communities was reduced by 41 to 73% in shaded conditions, but was not affected when left in ambient light. (monash.edu)
We examined the effect of short-term exposure to various oxygen and sulfide concentrations on sediment nitrification, denitrification and DNRA from a chronically hypoxic basin in Roskilde Fjord, Denmark. (lu.se)
Sediment denitrification is an important nitrate (NO 3 - ) removal process from agricultural streams. (cgu.org.tw)
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Bulk sediment and sediment grain properties were measured along with microbial colonization and cell abundances, oxygen consumption and denitrification rates. (nature.com)
Control of pH during denitrification in subsurface sediment microcosms using encapsulated phosphate buffer. (cdc.gov)
Denitrification, a process in which nitrate (NO-3) is used as an electron acceptor during microbial respiration, often occurs in saturated sediment where oxygen has been depleted. (cdc.gov)
Because these encapsulated buffers were effective at maintaining a neutral pH during denitrification in sediment microcosms, they may facilitate remediation of subsurface contaminants through the mediation of pH-limited biological or chemical processes. (cdc.gov)
In the study we can establish that the species in our experiment almost always chose denitrification regardless of the oxygen level in the sediment and bottom water - even though this produced less energy", says Helena Filipsson, geology researcher at Lund University. (lu.se)

Moreover, the relative abundance of 14N can be analyzed to distinguish denitrification apart from other processes in nature. (wikipedia.org)
However, denitrification is always before aerobic processes in conventional activated sludge treatment plants and thereby more exposed to inhibitory compounds. (iwaponline.com)
This research investigated spatial-temporal variation in benthic bacterial community structure, rates of denitrification and dissimilatory nitrate reduction to ammonium (DNRA) processes and abundances of corresponding genes and transcripts at three sites-the estuary-head, mid-estuary and the estuary mouth (EM) along the nitrate gradient of the Colne estuary over an annual cycle. (gla.ac.uk)
The soil-emitted N2O is generally predominantly derived from denitrification and, to a smaller extent, nitrification, both processes controlled by environmental factors and their interactions, and are influenced by agricultural management. (plymouth.ac.uk)
However, adverse effects of salt on performance of nitrifcation/denitrification processes has not been systematically investigated and mathematically formulated. (deu.edu.tr)
In all of the treatment processes, it is necessary to create a suitable dissolved oxygen (DO) environment, cultivate a dominant microbial flora, and design an economical return ratio to achieve the effect of biological denitrification. (trea.com)
To conclude, the currently used sub-modules are not able to consistently simulate the denitrification and decomposition processes. (uni-giessen.de)
Recent research shows that an internal carbon source, derived from the treatment of waste activated sludge (WAS), could be used as an alternative to external carbon sources for denitrification in biological wastewater treatment processes. (odu.edu)
Anaerobic microbial processes including denitrification, methanogenesis, and methanotrophy are responsible for releasing greenhouse gases (N 2 O, CH 4 , CO 2 ) into the atmosphere (Schlesinger, 1997). (kenyon.edu)

The combination of manure with the medium fertilizers rate has also resulted in high denitrification levels, while the soil nitrogen fixation activity has restored only at flowering stage. (frontiersin.org)
Significance and Impact of the Study: The long-term acclimated sludge used in this study resulted in high denitrification performance at a high salinity, indicating that the design of a high-performance denitrification system for saline wastewater will be possible. (elsevierpure.com)

Therefore, simple but sophisticated methods for measuring denitrification rates within the groundwater are crucial for predicting and managing N-fluxes within these anthropogenic ecosystems. (wiley.com)

Facultative anaerobic bacteria perform denitrification as a type of respiration that reduces oxidized forms of nitrogen in response to the oxidation of an electron donor such as organic matter. (wikipedia.org)
The denitrification process does not only provide energy to the organism performing nitrate reduction to dinitrogen gas, but also some anaerobic ciliates can use denitrifying endosymbionts to gain energy similar to the use of mitochondria in oxygen respiring organisms. (wikipedia.org)
Anaerobic oxidation of methane coupled to denitrification (AOM-D) is a unique microbial process which can oxidize methane coupled with nitrate reduction. (uwaterloo.ca)
The second AOM-D that has been proposed, is based on syntrophic reaction between reverse methanogenesis by anaerobic methanotrophic (ANME) archaea (or methanogen-like archaea) and denitrification by bacteria. (uwaterloo.ca)
In general, the proteins required for denitrification are only produced under (close to) anaerobic conditions, and if anaerobically grown, cells are exposed to O2 and then the activities of the proteins are inhibited. (uea.ac.uk)

Oxygen consumption and denitrification rates were linearly correlated to the microbial cell abundances, which ranged from 2.9 to 5.4·10 8 cells cm −3 . (nature.com)

There is no easily applicable and validated method available for determination of denitrification process efficiency and inhibition. (iwaponline.com)
Finally, it can be concluded that the newly developed system represents a comprehensive and simply applicable tool for the determination of denitrification in aquifers. (wiley.com)

Typically, denitrification occurs in anoxic environments, where the concentration of dissolved and freely available oxygen is depleted. (wikipedia.org)
Upon oxygen exposure, the bacteria is able to utilize nitrous oxide reductase, an enzyme that catalyzes the last step of denitrification. (wikipedia.org)
These soil samples were incubated at 20°C in the presence of (15NH2)2CO, Ca(15NO3)2, and Na15NO2 to investigate the biological activity, expressed as oxygen consumption rate (O2CR), carbon dioxide production rate (CO2PR), and potential denitrification (both biological and chemical) activity under controlled conditions in the laboratory. (gc.ca)
Volumetric oxygen consumption ranged from 14 to 77 µmol O 2 l −1 h −1 while nitrogen-loss via denitrification was between 3.7 and 8.4 µmol N l −1 h −1 . (nature.com)
nitrate, nitrite, ammonium and nitrous oxide) in the oxygen-depleted hypolimnion of the east lobe of the Lake implied that denitrification is or was active in the west, but not in the east lobe. (princeton.edu)

Contrary to the nitrification process, denitrification is accomplished by a relatively wide range of microorganisms (prokaryotic microorganisms, chemoorgano-heterotrophs, chemo-litho-autotrophs). (iwaponline.com)

The direct and indirect factors that control denitrification rates in tributary sediments can vary depending on the types of agricultural activities and vegetation. (cgu.org.tw)
and (2) the environmental factors that determine denitrification rates in tributary sediments. (cgu.org.tw)
The denitrification enzyme activity (DEA) in grassland stream sediments is positively correlated with precipitation likely due to the increased nutrient exchange rates between stream water and sediments, and was higher than in forest stream sediments, leading to a decrease in NO 3 - concentration ([NO 3 - ]) in stream sediments. (cgu.org.tw)
Impact of suburbanization on ground water quality and denitrification in coastal aquifer sediments. (cdc.gov)

Denitrification with Candy Carbon & Probiotic Scrubber II Industrial Wastewater Treatment Plant 0.7 MGD Denitrification efficiency in wastewater treatment is dependent on several environmental conditions. (biolynceus.net)

Furthermore, denitrification can occur in oxic environments as well. (wikipedia.org)
For example, the bacterial species Paracoccus denitrificans engages in denitrification under both oxic and anoxic conditions simultaneously. (wikipedia.org)
In the west lobe, measured denitrification rates exhibited a maximum at the depth of the chemocline and denitrification was not detectable in either the oxic surface waters or in the deep water where nitrate was absent. (princeton.edu)

abstract = "The distribution of denitrification was investigated in the hypolimnion of the east and west lobes of permanently ice-covered Lake Bonney, Taylor Valley, Antarctica. (princeton.edu)

Since denitrification can remove NO3−, reducing its leaching to groundwater, it can be strategically used to treat sewage or animal residues of high nitrogen content. (wikipedia.org)
Here, we provide isotopic evidence (δ15NNO3 and δ18ONO3) from shallow groundwater at the Hubbard Brook Experimental Forest indicating extensive denitrification during midsummer, when transient, perched patches of saturation developed in hillslopes, with poor hydrological connectivity to the stream, while streamwater showed no isotopic evidence of denitrification. (vt.edu)
Together, these measurements reveal the importance of denitrification in hydrologically disconnected patches of shallow groundwater during midsummer as largely overlooked control points for nitrogen loss from temperate forest catchments. (vt.edu)

Two approaches, which rely on the measurement of 28 N 2 , 29 N 2 and 30 N 2 , exhibit the best reliability in the case of a clear 15 N enrichment of evolved denitrification gases. (wiley.com)

Denitrification rates declined down the estuary, while DNRA rates were higher at the estuary head and middle than the EM. (gla.ac.uk)
In four out of the six 2-monthly time-points, rates of DNRA were greater than denitrification at each site. (gla.ac.uk)
Abundance of gene markers for nitrate-reduction (nitrate reductase narG and napA), denitrification (nitrite reductase nirS) and DNRA (DNRA nitrite reductase nrfA) declined along the estuary with significant relationships between denitrification and nirS abundance, and DNRA and nrfA abundance. (gla.ac.uk)
Spatially, rates of denitrification, DNRA and corresponding functional gene abundances decreased along the estuary. (gla.ac.uk)

Denitrification can lead to a condition called isotopic fractionation in the soil environment. (wikipedia.org)
The study aim was to evaluate the potential nitrogen fixation and denitrification in the rhizosphere soil of potato plants, crop yield and output quality in response to the different fertilization systems and the inoculation with Azospirillum brasilense 410. (frontiersin.org)
Under its use the increase of soil nitrogenase activity and low denitrification levels were observed. (frontiersin.org)
Denitrification was not detected when (15NH2)2CO (500 mg N L−1) was incubated with L-H and 0 to 5-cm soil profile samples under aerobic condition. (gc.ca)
The results agreed with previous findings where it is clear there are two N pools with different dynamics: added N producing intense denitrification vs. soil N resulting in less isotopic fractionation. (plymouth.ac.uk)
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Current models were developed before suitable soil N2 flux data were available, which may have led to inaccuracies in how denitrification was described. (uni-giessen.de)

Denitrification is commonly used to remove nitrogen from sewage and municipal wastewater. (wikipedia.org)
The present disclosure relates to the fields of environmental protection and sewage treatment, and specifically relates to a self-circulating high-efficiency biological denitrification device and a working process thereof, which are suitable for denitrification and dephosphorization of domestic sewage with a low carbon-to-nitrogen ratio. (trea.com)

Here, a newly developed automated online 15 N-tracer system is presented for measuring (N 2 +N 2 O) production due to denitrification in aquifer samples. (wiley.com)

Biological denitrification and phosphate adsorption filters are treatments options that can help reduce nitrate and phosphate concentration from agricultural subsurface drainage before it can be discharged in surface water. (sdstate.edu)

Aims: Denitrification efficiency at 10% salinity was compared with that at 2% salinity. (elsevierpure.com)
The characteristics of bacterial strains isolated from the denitrification system, where an improvement of denitrification efficiency was observed at a high salinity were investigated. (elsevierpure.com)
Denitrification efficiency at 10% salinity was higher than that at 2% salinity. (elsevierpure.com)
Conclusions: The improvement of denitrification efficiency at a high salinity was demonstrated. (elsevierpure.com)
Thus, it was determined that OpenCEL treated TWAS, without downstream solids separation, is not a feasible technology for denitrification enhancement regardless of PEF treatment efficiency. (odu.edu)

In this study, a thickened waste activated sludge (TWAS) treatment technology, developed by the company OpenCEL, was used to treat TWAS with pulsed electric fields (PEF) to transform it into an organic substrate for heterotrophic denitrification in a biological nutrient removal (BNR) system. (odu.edu)

It considers the aspects of denitrification that occur in archaea and certain fungi. (uea.ac.uk)

Previous research has shown that KH2PO4 microcapsules were effective at maintaining a neutral pH during denitrification in suspended bacterial cultures. (cdc.gov)

There were no consistent stimulatory effects of metal chelators or nutrient addition on the rate of denitrification in either lobe, so that the mechanisms underlying the unusual N cycle of the east lobe remain unknown. (princeton.edu)

A 4 kelvin decrease in the temperature of the Arctic stratosphere due to anthropogenic and/or natural effects can trigger the occurrence of widespread severe denitrification. (nasa.gov)
Ozone loss is amplified in a denitrified stratosphere, so the effects of falling temperatures in promoting denitrification must be considered in assessment studies of ozone recovery trends. (nasa.gov)

Biogeochemical models are essential for the prediction and management of nitrogen (N) cycling in agroecosystems, but the accuracy of the denitrification and decomposition sub-modules is critical. (uni-giessen.de)
The denitrification and decomposition sub-modules of DeNi, Coup and DNDC were tested using the data. (uni-giessen.de)

In terms of engineering application, our group has been operating a membrane biofilm reactor(MBfR)for denitrification, as shown in the figure below. (uwaterloo.ca)
The denitrification in the prior art generally adopts a combined reactor composed of a denitrification reactor and a secondary settling tank that are horizontally connected in series. (trea.com)

We conclude that all the ingredients necessary to allow denitrification to occur are present in the east lobe. (princeton.edu)

In this study, using Comamonas testosteroni as a model organism, we demonstrated the involvement of Comamonas biofilms in denitrification under bulk aerobic conditions and elucidated the influence of nitrate respiration on its biofilm lifestyle. (ntu.edu.sg)

In this study, a method for evaluation of inhibition on the activated sludge denitrification process was developed and validated using 3,5-dichlorophenol (3,5-DCP) as a model inhibitory compound and additionally controlled with real wastewater produced in the shale oil industry. (iwaponline.com)

Computed denitrification profiles for one Antarctic and two Arctic cold winters are presented. (nasa.gov)
The vertical range over which denitrification occurs is normally quite deep in the Antarctic but limited in the Arctic. (nasa.gov)
Spread of Denitrification From 1987 Antarctic and 1988-1989 Arctic. (nasa.gov)

The results indicated that over time periods as short as five days, denitrification increased the pH beyond the range considered to be optimal for microbial metabolism. (cdc.gov)

This is less common than denitrification in most ecosystems as a means of nitrate reduction. (wikipedia.org)
Thus, environmental factors affected by different types of agricultural activities and vegetation might regulate denitrification rates and [NO 3 - ] in agricultural stream ecosystems. (cgu.org.tw)

The results agreed with denitrification as the main source of fluxes at the highest saturations, but nitrification could have occurred at the lower saturation, even though moisture was still high (71 % WFSP). (plymouth.ac.uk)

Denitrification is a microbially facilitated process where nitrate (NO3−) is reduced and ultimately produces molecular nitrogen (N2) through a series of intermediate gaseous nitrogen oxide products. (wikipedia.org)
Gaseous losses of nitrogen to denitrification are especially poorly documented and are often ignored. (vt.edu)

Aquifers within agricultural catchments are characterised by high spatial heterogeneity of their denitrification potential. (wiley.com)

Denitrification has been mostly studied in Paracoccus denitrificans and Pseudomonas stutzeri and so it describes denitrification for each of these organisms in turn before considering to what extent general principles can be discerned. (uea.ac.uk)

Specialized denitrifiers, such as P. denitrificans and the denitrifying Pseudomonads, contain more than 40 genes, which encode the proteins that make up a full denitrification pathway. (uea.ac.uk)

To determine the utility of OpenCEL-treated TWAS as an internal carbon source to aid in denitrification, this study employed three 22 L Sequencing Batch Reactors (SBRs) continuously-operating for five months and simulating a 4-stage Bardenpho configuration to determine if treated TWAS could reduce or replace an external carbon source. (odu.edu)

Denitrification rates decreased at 5ºC compared to 22ºC for composted woodchips and fresh woodchips. (sdstate.edu)

The vertical NO y redistribution caused by the sedimentation of the NAT particles, in particular the denitrification and nitrification signals observed by the ACE-FTS satellite instrument and the in situ SIOUX instrument aboard the Geophysica, are reproduced by the improved model, and a small improvement with respect to the constant nucleation rate model is found. (copernicus.org)

In the east lobe, denitrification was detected below the chemocline, at the depths where ammonium, nitrate, nitrite and nitrous oxide are all present at anomalously high levels. (princeton.edu)

The highest doses of mineral fertilizers, N 120 P 120 K 120 , substantially affected the denitrification process and reduced the nitrogen fixation activity (in 1.9-2.2 times). (frontiersin.org)

For a given temperature history the degree of denitrification by NAD clouds is much less severe than that by NAT clouds. (nasa.gov)

Methods and Results: Two continuous feeding denitrification systems for saline solutions of 2% and 10% salinity, were operated. (elsevierpure.com)

The third approach, which uses only the ratio of 29 N 2 / 28 N 2 , overestimates the concentration of labelled denitrification products under these conditions. (wiley.com)

Below are the most recent publications written about "Denitrification" by people in Profiles. (rush.edu)

Anatomy1

Organisms34

Chemicals and Drugs37

Analytical, Diagnostic and Therapeutic Techniques and Equipment4

Phenomena and Processes28

Disciplines and Occupations2

Technology, Industry, Agriculture1

Information Science2

Health Care22

Geographicals1

Denitrifying bacteria1

Nitrification and denitrification7

Sediment10

Processes9

Resulted in high denitrification2

Measuring denitrification rates1

Anaerobic5

Consumption and denitrification1

Determination of denitrification2

Oxygen5

Microorganisms1

Sediments4

Wastewater treatment1

Oxic3

Abstract1

Groundwater3

Gases1

DNRA4

Soil9

Sewage2

Aquifer1

Subsurface1

Efficiency5

Biological nutrient removal1

Archaea1

Bacterial1

Nutrient1

Stratosphere2

Decomposition2

Reactor2

Occur1

Respiration1

Evaluation1

Antarctic3

Microbial1

Ecosystems2

Saturation1

Gaseous2

Catchments1

Paracoccus1

Pathway1

Carbon1

Rates1

Signals1

Nitrous1

Process1

Severe1

Methods1

Concentration1

Profiles1