
	Where results make sense

Topic: Denitrification

In the News (Mon 17 Jun 13)

EXECUTIVE POWER

Iran

ANALYSIS

Pakistan

Family compact

	Denitrification - Wikipedia, the free encyclopedia
		Denitrification is the process of reducing nitrate, a form of nitrogen available for consumption by many groups of organisms, into gaseous nitrogen, which is far less accessible to life forms but makes up the bulk of our atmosphere.
		Denitrification and nitrification are parts of the nitrogen cycle.
		Denitrification is the second step in the nitrification-denitrification process: the conventional way to remove nitrogen from sewage and municipal wastewater.
	en.wikipedia.org /wiki/Denitrification (268 words)

	Denitrification in Aquatic and Marine Environments (Site not responding. Last check: 2007-11-04)
		Steady-state and transient-state denitrification rates were measured in sediment cores from a brackish river of the Chesapeake Bay using high precision membrane inlet mass spectrometry.
		Denitrification was independent of salinity over the range of 1-13 ppt and directly dependent on nitrate concentration over the range of 0-200 µM in the overlying water.
		Denitrification was observed when the water colunm nitrate concentration was <1 µM, indicating that nitrification in the sediments was occurring.
	www.hpl.umces.edu /kana/denitrification/denitrif.htm (272 words)

	Research (Site not responding. Last check: 2007-11-04)
		Denitrification (the microbial conversion of available nitrogen NO3 to unavailable nitrogen (N2)) is probably the most important nitrogen cycling pathway, because it is one of the few natural processes that is capable of counteracting the process of eutrophication (Kemp et al., 1990).
		Sediment denitrification typically occurs in the upper 10 or 20 mm of the sediment (Jorgensen, 1996) and around animal burrows and is primarily controlled by small-scale gradients in labile carbon, nitrogen and oxygen (Figure 1).
		Denitrification is probably the most important nitrogen cycling pathway because it is one of the few natural processes that is capable of counteracting the process of eutrophication.
	www.scu.edu.au /schools/rsm/ccb/Research.html (4416 words)

	Measurement of Denitrification in Sediments with the 15N Isotope Pairing Technique -- Steingruber et al. 67 (9): 3771 ... (Site not responding. Last check: 2007-11-04)
		Denitrification, dissimilatory reduction of nitrate to ammonium, and nitrification in a bioturbated estuarine sediment as measured with
		Sediment mineralisation, nutrient fluxes, denitrification and dissimilatory nitrate reduction to ammonium in an estuarine fjord with sea cage trout farms.
		Denitrification in estuarine sediments in the eastern Gulf of Finland, Baltic Sea.
	aem.asm.org /cgi/content/full/67/9/3771 (4161 words)

	State Water Resources Research Institute Program
		Denitrification by microbes in surface waters could account for much of the fate of this missing N, implying larger losses from agricultural fields than would be estimated solely by river N fluxes.
		Denitrification was detected at all sites yet they found a wide range in denitrification rates, with water nitrate and sediment C and N concentration explaining much of the variation.
		Denitrification rates were also correlated with increasing river size where there were greater rates of sedimentation resulting from higher current velocities, as well as increased nutrient concentrations in the water column (Garcia-Ruiz et al., 1998).
	water.usgs.gov /wrri/00grants/ILsediment.html (2492 words)

	Determination of Denitrification Capacity of the Widely Distributed Soil Series of the Turkish Republic of Northern ...
		Denitrification, therefore, occurs in many soil conditions, stimulated by nitrate and water contents of soil, temperature and insufficient oxygen diffusion (Gök et al., 1999; Boşgelmez et.
		The highest denitrification losses (N2+N2O) were determined in Balıkesir (749 g N g ds-1) whereas the lowest were 137 g N g ds-1 in Türkmenköy.
		Significant differences both in denitrification and biological activity parameters should be most probably due to varying of soil properties, which also affected the biological properties as well.
	www.toprak.org.tr /isd/can_36.htm (1525 words)

	Virtual Tour of the Treatment Plant (Site not responding. Last check: 2007-11-04)
		Denitrification is an anaerobic biological process, employed to convert the nitrate-nitrogen in the effluent from the activated sludge-nitrification process into nitrogen gas.
		A supplemented carbon source (methanol) is added to the denitrification filter influent to provide a food source for the denitrifying culture in the filters.
		There are 32 denitrification filters arranged for control in two groups of ten and two groups of six.
	www.tampagov.net /dept_wastewater/Advanced_Water_Treatment_Plant/Virtual_Tour/Denitrification.asp (348 words)

	[No title] (Site not responding. Last check: 2007-11-04)
		Bryan, B.A. ``Physiology and Biochemistry of Denitrification in - Denitrification Nitrification, and Atmospheric Nitrous Oxide.
		``Vigorous Denitrification by a Heterotrophic Nitrifier of the Genus Alcaligenes." Curr.
		Goering, J.J., Cline, J.D., ``Denitrification in Seawater", Limnol Oceanogr., 15:306-308, 1970.
	bridge.ecn.purdue.edu /~alleman/w3-n2/TXT2.txt (13900 words)

	Denitrification
		Denitrification : The biological reduction of nitrate to nitrogen gas by denitrifying bacteria in soil.
		Denitrification in soil and sub surface sediments by Timothy B. Parkin
		Denitrification activity in soils and sediments by TB Parkin.
	www.mongabay.com /reference/environment/Denitrification.html (387 words)

	Denitrification of the polar stratosphere project (Site not responding. Last check: 2007-11-04)
		Denitrification is the removal of reactive nitrogen species from the stratosphere.
		The effect of denitrification is to increase ozone depletion in the polar stratosphere since it hinders an important gas phase chemical reaction that deactivates ozone destroying chlorine species.
		The model denitrification fields will then be used in chemical transport models to investigate the effect on ozone depletion.
	www.env.leeds.ac.uk /research/ias/aerosols/denitrification.htm (493 words)

	Nitrous Oxide Emission and Denitrification in Chronically Nitrate-Loaded Riparian Buffer Zones -- Hefting et al. 32 ...
		Denitrification in strips parallel to the stream in the forested and grassland riparian buffer zones, and N
		Denitrification as a sink for dissolved nitrous oxide in a freshwater riparian fen.
		Measuring the contributions of nitrification and denitrification to the flux of nitrous oxide from soil.
	jeq.scijournals.org /cgi/content/full/32/4/1194 (5372 words)

	Denitrification in Seepage-Irrigated Vegetable Fields in South Florida (Site not responding. Last check: 2007-11-04)
		Denitrification studies in columns on soils from south Florida have found that when soil organic matter content is less than 0.91%, it becomes the limiting factor for denitrification, when NO supply is not limiting (Tsai, 1989).
		Denitrification estimates found in the literature from short-term studies (few days) from world-wide ecosystems are overall in good agreement (Table 2).
		The denitrification estimate from lysimeter-grown bell pepper was obtained by difference (Stanley and Clark, 1993) and is likely to over-represent denitrification rate in the field due to the accumulation of error in the fraction determined by difference.
	edis.ifas.ufl.edu /HS248 (5016 words)

	The Potential for Denitrification of Ground Water by Coastal Plain Sediments in the Patuxent River Basin, Maryland by ...
		In this classification, a high potential for denitrification means that ground water passing through the unit will discharge with low nitrate concentrations regardless of the nitrate concentration from the source; this indicates that nitrate has been removed from the ground water.
		A low denitrification potential means that ground water with a high nitrate concentration will have a high nitrate concentration when it discharges as stream base flow, with little or no removal of nitrate from the ground water.
		For settings with an intermediate denitrification potential, some fraction of the total volume of ground water may undergo denitrification, and nitrate concentrations in discharging waters may be relatively low but may still exceed natural background levels (typically less than 0.1 milligram per liter as nitrogen).
	md.water.usgs.gov /publications/fs-053-00/html (2064 words)

	WaterWorld - Deep Bed Denitrification Filters Play Role in Improved Wastewater Quality
		The combination of denitrification and solids removal in a deep bed filter process was first patented in 1979, and since then the technology has been responsible for helping improve wastewater quality at treatment plants across the country.
		During this form of denitrification, nitrate-nitrogen is biologically converted into nitrogen gas, thus playing an integral role in maintaining the integrity of the wastewater treatment plant’s receiving waters.
		During this fixed-film biological denitrification process, wastewater is forced to flow around nitrogen gas bubbles that accumulate in media voids in the filtration vessel, improving biomass contact and filtration efficiency.
	ww.pennnet.com /Articles/Article_Display.cfm?Section=ARTCL&ARTICLE_ID=233081&VERSION_NUM=2&p=41 (1484 words)

	Denitrification
		Denitrification is carried out by a variety of facultative anaerobic bacteria including Pseudomonas, Alcaligenes, Flavobacterium, and Bacillus.
		Denitrification is most important in soils with poor aeration, abundant organic matter, and sufficient nitrate.
		Tiedje, J. Ecology of denitrification and dissimilatory nitrate reduction to ammonium.
	www.oznet.ksu.edu /ed_agron645/lab/645lab8.htm (770 words)

	ARS \| Publication request: Denitrification Potential in Constructed Wetlands Used for the Treatment of Swine Wastewater (Site not responding. Last check: 2007-11-04)
		The high rates of denitrification in the bulrush wetlands are consistent with their reported high level of nitrogen treatment - greater than 25 pounds per acre in a day.
		We investigated denitrification and potential for denitrification in bulrush and cattail wetlands used for the treatment of swine lagoon wastewater.
		In the case of bulrush, denitrification in wetland cores decreased by >60% as the water depth increased from 48 to 88 mm, R2 = 0.88; the slope was -0.128 mg N/m2/h/mm depth.
	www.ars.usda.gov /research/publications/Publications.htm?seq_no_115=130064 (596 words)

	Seasonal Dynamics of Denitrification along Topohydrosequences in Three Different Riparian Wetlands -- Clément et ...
		Nitrous oxide emissions and denitrification N-losses from agricultural soils in the Bornhöved Lake region: Influence of organic fertilizers and land-use.
		Denitrification in pasture and cropped soil clods as affected by pore space structure.
		Denitrification in a grassed and a wooded, valley and ridge, riparian ecotone.
	jeq.scijournals.org /cgi/content/full/31/3/1025 (5879 words)

	Nitrous oxide sources - Tropical Soils (Site not responding. Last check: 2007-11-04)
		Because of this, extra N inputs to these P limited tropical soils may cause nitrous oxide emissions hundreds of times greater than that which would be seen in N-limited temperate soils.
		These AOB have also been shown to oxidize certain amounts of the greenhouse gas methane as part of the nitrification process, though whether they have a significant impact on methane emissions from soil is still open to debate.
		Denitrification involves the reduction of nitrate in the soil to gaseous nitrogen (N
	www.ghgonline.org /nitroustropsoil.htm (474 words)

	WQ255 Denitrification, MU Extension
		Denitrification becomes significant when the soil is waterlogged for 36 hours or more.
		The positive implication is that denitrification converts nitrates (NO) to nitrogen gas, resulting in a net loss of nitrate from the soil system.
		The negative aspect of denitrification is that it takes place in soils that are waterlogged.
	muextension.missouri.edu /explore/envqual/wq0255.htm (532 words)

	Denitrification (Site not responding. Last check: 2007-11-04)
		Denitrification is when nitrate is in an anaerobic environment and reduces to nitrous oxide or dinitrogen gas.
		This presents a problem since the use of manures, organic by-products, and green manure crops is essential in sustainable agriculture.
		Soil moisture is the largest factor in denitrification.
	pasture.ecn.purdue.edu /AGEN521/epadir/sustain/denitrification.html (86 words)

	Analysis to delineate redox processes and flow paths in riparian zone glacial outwash aquifer-stream system
		Denitrification losses, inferred by measuring changes in NO concentration at various points across the riparian zone, are frequently offered as evidence of this process.
		The strongest denitrification response therefore was to organic C amendment, particularly the highly linear response of forest (OF1) and wetland edge (A1) sediments (Figure 8a).
		Blicher-Mathiesen, G., G.W. McCarty, and L.P. Nielsen, Denitrification and degassing in groundwater estimated from dinitrogen and argon, J. Hydrol., 208, 16-24, 1998.
	water.usgs.gov /nawqa/nutrients/pubs/wrr_v38/wrr_v38.html (9438 words)

	Denitrification and ammonia oxidation by Nitrosomonas europaea wild-type, and NirK- and NorB-deficient mutants -- ... (Site not responding. Last check: 2007-11-04)
		Denitrification and ammonia oxidation by Nitrosomonas europaea wild-type, and NirK- and NorB-deficient mutants -- Schmidt et al.
		O during denitrification, both mutants released high quantities of hydroxylamine into the medium which subsequently converted into nitrogen gases (auto-oxidation/chemodenitrification).
		Bodelier, P. E., Libochant, J. A., Blom, C. and Laanbroek, H. Dynamics of nitrification and denitrification in root-oxygenated sediments and adaptation of ammonia-oxidizing bacteria to low-oxygen or anoxic habitats.
	mic.sgmjournals.org /cgi/content/full/150/12/4107 (2686 words)

	Denitrification
		The biological denitrification process by which toxic nitrate ions are removed from water and converted by bacteria to nitrogen gas.
		A denitrification plant basically comprises an injection well for adding nutrients, a biological reactor, and a pumping well for the abstraction of treated water.
		The process requires a sufficient supply of nitrate, which serves as the oxygen source for the organic (heterotropic) reaction, plus an energy source (often organic matter such as methanol or ethanol), plus anaerobic conditions (dissolved oxygen below 0,5 mg/l).
	academic.sun.ac.za /polymer/WRC/denit.htm (169 words)

	Codenitrification and Denitrification Are Dual Metabolic Pathways through Which Dinitrogen Evolves from Nitrate in ... (Site not responding. Last check: 2007-11-04)
		Denitrification by the fungus Fusarium oxysporum and involvement of cytochrome P-450 in the respiratory nitrite reduction.
		Denitrification by yeasts and occurrence of cytochrome P450nor in Trichosporon cutaneum.
		Denitrification by the fungus Cylindrocarpon tonkinense: anaerobic cell growth and two isozyme forms of cytochrome P-450nor.
	jb.asm.org /cgi/content/full/184/11/2963 (2701 words)

	Hydroxyl / Denitrification - Biological Treatment (Site not responding. Last check: 2007-11-04)
		Denitrification of municipal effluent can be effected by an extension of Hydroxyl-F³R and F³RAS technology for Nitrification.
		Denitrification can be performed either with a return sludge (Hydroxyl-F³RAS) or without (Hydroxyl-F³R).
		A prerequisite for nitrogen removal is to achieve full nitrification, as described in the nitrification section.
	www.hydroxyl.com /municipal/capabilities/denitrification.html (154 words)

Try your search on: Qwika (all wikis)