Relevant bibliographies by topics / Denitrification rate

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers

Academic literature on the topic 'Denitrification rate'

Author: Grafiati
Published: 4 June 2021
Last updated: 18 February 2022

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the lists of relevant articles, books, theses, conference reports, and other scholarly sources on the topic 'Denitrification rate.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Journal articles on the topic "Denitrification rate"

1

Bergstrom, D. W., and E. G. Beauchamp. "Relationships between denitrification rate and determinant soil properties under barley." Canadian Journal of Soil Science 73, no. 4 (November 1, 1993): 567–78. http://dx.doi.org/10.4141/cjss93-056.

Full text
Abstract:
To better understand environmental regulation of denitrification, we examined relationships between denitrification rate and six determinant soil properties: moisture content, air-filled porosity, NO3− content, respiration rate, mineralizable-C concentration and denitrifying enzyme activity (DEA). Soil cores were collected on 27 sampling dates over a growing season at a site seeded to barley (Hordeum vulgare). Denitrification rate was measured using a static core technique and acetylene blockage. Moisture content and air-filled porosity and, to a lesser extent, mineralizable-C concentration and respiration rate were more strongly related to denitrification rate than was DEA. Denitrification rate was unrelated to NO3− content. On most sampling dates, mean denitrification rate increased substantially only below an air-filled porosity of 0.3. Moreover, the distribution of individual measurements of denitrification rate was less skewed at lower air-filled porosities. Approximately 60% of variation in mean values of denitrification rate for each sampling date could be accounted for by measurements of bulk soil properties, of which moisture content and air-filled porosity were most important. Measurements of bulk soil properties did not account for nil values of denitrification rate at low air-filled porosities or for small-scale spatial variability. Such measurements were better indicators of temporal variation — that is, when denitrification occurred — than of actual rates. Key words: Denitrification, air-filled porosity, denitrifying enzyme activity
APA, Harvard, Vancouver, ISO, and other styles
2

Kozub, D. D., and S. K. Liehr. "Assessing Denitrification Rate Limiting Factors in a Constructed Wetland Receiving Landfill Leachate." Water Science and Technology 40, no. 3 (August 1, 1999): 75–82. http://dx.doi.org/10.2166/wst.1999.0140.

Full text
Abstract:
The focus of this research was to investigate denitrification in constructed wetlands to improve the nitrogen treatment capabilities of these systems. A free water surface flow constructed wetland located at the New Hanover County Solid Waste Management Facility, near Wilmington, North Carolina, USA, was used for this research. Field water sampling in conjunction with a laboratory acetylene block method was used to quantify nitrogen removals in the wetland. Background denitrification rates as well as potential denitrification rates using sodium acetate and sodium phosphate were measured in the laboratory. According to field measurements, average nitrate nitrogen loading and removal rates in the constructed wetland during 1997 were 11.1 ± 3.4 g N/m3/d and 4.5 ± 2.2 g N/m3/d, respectively. Denitrification rates measured in the laboratory with the addition of sodium acetate were higher than background denitrification rates while the addition of sodium phosphate had no effect on the denitrification rates. Results suggested denitrification in the wetland was limited by the availability of easily degradable sources of organic carbon. Background denitrification rates measured using the laboratory method were comparable to the nitrate nitrogen removal rates measured by field water sampling.
APA, Harvard, Vancouver, ISO, and other styles
3

Vabolienė, Giedrė, and Algirdas Bronislovas Matuzevičius. "ASSESMENT OF NITRIFICATION AND DENITRIFICATION RATE IN BIOLOGICAL NITROGEN REMOVAL FROM WASTEWATER." JOURNAL OF ENVIRONMENTAL ENGINEERING AND LANDSCAPE MANAGEMENT 15, no. 2 (June 30, 2007): 77–84. http://dx.doi.org/10.3846/16486897.2007.9636912.

Full text
Abstract:
Biological nitrogen removal from wastewater is based on nitrification and denitrification processes in biological treatment plants with activated sludge. Slowed growth of nitrification bacteria is one of basic problems in biological nitrogen removal from wasterwater. Using biological nitrogen removal technologies at changing nitrification and denitrification rate, it is very important to evaluate properly aeration and reduced aeration duration and to estimate nitrification and denitrification rate. To this purpose an investigation was carried out at Utena Wastewater Treatment Plant. Nitrification and denitrification rate was estimated during five experiments in aeration tanks when the duration of aeration and reduced aeration was from 120 to 180 min. Nitrification and denitrification rate at a different aeration regime and impact of aeration regime on biological nitrogen removal was estimated in the work.
APA, Harvard, Vancouver, ISO, and other styles
4

Bode, H., C. F. Seyfried, and A. Kraft. "High-Rate Denitrification of Concentrated Nitrate Wastewater." Water Science and Technology 19, no. 1-2 (January 1, 1987): 163–74. http://dx.doi.org/10.2166/wst.1987.0198.

Full text
Abstract:
The principles of high-rate denitrification are explained. In the experimental section of the paper the results of nine lab-scale experiments are described and compared with data gained from reviewed literature. The tests were performed in continuous flow stirred-tank and wash-out reactors under mesophilic and thermophilic conditions. The experimental results confirm that high-rate denitrification is an extremely efficient process. Removal rates of up to 25 kg NOx-Nel./ (m3·d) were achieved with the activated sludge systems. The nitrate sludge loading was found to be the significant design parameter for the process if there is an excess of organic substrate. The maximum rate achieved by thermophilic bacteria was 10 kg NOx-Nel./(kg MLVSS·d) which exceeded by 33 % that for mesophilic organisms. Due to this, in the wash-out reactors the thermophilic system was superior to the mesophilic at system-related, inevitably similar MLVSS concentrations. But because of a temperature-dependent type of growth (thermophilic: disperse; mesophilic: flocculating), in the case of systems with recycling of biomass, higher removal rates (per volume) were obtained for the mesophilic reactors.
APA, Harvard, Vancouver, ISO, and other styles
5

Walczak, J., and M. Zubrowska-Sudol. "The rate of denitrification using hydrodynamically disintegrated excess sludge as an organic carbon source." Water Science and Technology 77, no. 9 (March 17, 2018): 2165–73. http://dx.doi.org/10.2166/wst.2018.125.

Full text
Abstract:
Abstract This study investigates the potential of hydrodynamically disintegrated excess activated sludge when used as a supplementary carbon source for denitrification. Two objectives constituted this study: (i) to analyse the denitrification rate by using excess sludge subjected to hydrodynamic disintegration (HD), performed at different energy densities, as an organic carbon source, and (ii) to analyse the impact of hydrolysis of disintegrated sludge on the denitrification rate. Nitrate reduction tests were conducted to assess the denitrification rate for the following sources of organic carbon: thickened excess sludge disintegrated at three levels of energy density (70, 140 and 210 kJ/L), acetic acid solution and municipal wastewater after mechanical treatment. It was found that the HD of excess sludge conducted at different levels of energy density led to dissolved organic compounds characterised by various properties as donors of H+ in the denitrification process. The susceptibility of disintegrated sludge to anaerobic hydrolysis decreased along with the increasing energy density. The obtained organic carbon contributed to a lower increase in the denitrification rate in comparison to that when disintegrated sludge not subjected to hydrolysis was applied.
APA, Harvard, Vancouver, ISO, and other styles
6

Jiang, Feng, Zhen-Sheng Liang, Guo-Liang Peng, Jin Qian, and Guang-Hao Chen. "Nitrogen removal capacity of simultaneously autotrophic and heterotrophic denitrification in a sewer receiving nitrified source-separated urine." Water Practice and Technology 8, no. 1 (March 1, 2013): 33–40. http://dx.doi.org/10.2166/wpt.2013.005.

Full text
Abstract:
Discharging source-separated and nitrified urine into sewer helps to save cost and space in biological nitrogen treatment as in-sewer denitrification is induced. This unique denitrification process may become complicated in sewers with sulfide contamination as simultaneously autotrophic and heterotrophic denitrification possibly occur but may compete each other for nitrate in oxidation of sulfide and organics. The objective of this study is to estimate the mixed denitrification rate in a sulfide-contaminated sewer when nitrified urine (mainly nitrite and nitrate) is discharged. In this study two investigations were conducted: (1) determination of the autotrophic, heterotrophic and mixed denitrification rates via lab batch tests and (2) determination of the total nitrogen removal rate in a 6.5-km long force main sewer via field study with calcium nitrate dosed at an average influent rate of 15.6 mg N/L. The lab tests determined the rates of autotrophic, heterotrophic and mixed denitrification at 0.36 ± 0.06, 6.54 ± 0.04 and 1.99 ± 0.1 mg N/L/h, respectively, while the field study estimated the total in-sewer denitrification rate at 2.32 mg N/L/h in the sewer when sulfide was present. Simultaneously autotrophic and heterotrophic denitrification was found when sewage was contaminated with sulfide. However, nitrogen removal rate of heterotrophic denitrification was 3.3 times higher that of the mixed denitrification process. The results indicate that discharging source-separated and nitrified urine into sewer is meaningful to decentralized sewage treatment, especially when sulfide is absent in the sewer.
APA, Harvard, Vancouver, ISO, and other styles
7

Lie, Ewa, and Thomas Welander. "Influence of dissolved oxygen and oxidation–reduction potential on the denitrification rate of activated sludge." Water Science and Technology 30, no. 6 (September 1, 1994): 91–100. http://dx.doi.org/10.2166/wst.1994.0256.

Full text
Abstract:
The influence of low concentrations of dissolved oxygen (DO) and the oxidation-reduction potential (ORP) on the denitrification activity of activated sludge has been studied in batchwise experiments. The ORP was maintained at different levels by automatic titration with air and the denitrification activity was determined by following the disappearance of nitrate. Oxygen was found to have a negative effect on denitrification even at lower concentrations than can be measured with conventional oxygen probes (<0.1 mg/L). The ORP was found to be a useful indicator of the DO concentration at this low level and the denitrification rate was found to decrease linearly with increasing ORP. However, the effect of the ORP on denitrification differed between sludges from different treatment plants. A linear relationship was also found between the ORP and the DO concentration in the region of measurable DO concentrations. Extrapolation of this straight line into the region where DO was under the detection limit indicated that oxygen exerts an inhibitory effect on denitrification at such low concentrations as a few μg/L.
APA, Harvard, Vancouver, ISO, and other styles
8

Machefert, S. E., and N. B. Dise. "Hydrological controls on denitrification in riparian ecosystems." Hydrology and Earth System Sciences 8, no. 4 (August 31, 2004): 686–94. http://dx.doi.org/10.5194/hess-8-686-2004.

Full text
Abstract:
Abstract. Nitrous oxide fluxes and denitrification rates were measured in situ over a year at a riparian site in the UK. An exponential relationship was found between denitrification rates and soil moisture, with a sharp increase in denitrification rate at a water-filled pore space of 60–80%. Similar relationships were found in other studies compiled for comparison. The present study is unique in measuring denitrification in an "intact" ecosystem in the field, rather than in cores in the field or the lab. The exponential relationship between denitrification rate and soil moisture, with a "threshold" at 60–80% water-filled pore space (20–40% gravimetric moisture), has proven to be comparable across a wide range of ecosystems, treatments and study conditions. Whereas moisture content determines the potential for denitrification, the absolute rate of denitrification is determined by available nitrate (NO3-), dissolved organic carbon and temperature. As a first approximation, denitrification rates can be simply modelled by using a general exponential relationship between denitrification potential and water-filled pore space (or volumetric/gravimetric water content) multiplied by a constant value determined by the nitrogen status of the site. As such, it is recommended that the current relationship used in INCA to relate denitrification to soil moisture be amended to an exponential form, with a threshold of approximately 70% for the onset of denitrification. Keywords: nitrous oxide, denitrification, soil moisture, nitrogen, eutrophication, riparian
APA, Harvard, Vancouver, ISO, and other styles
9

Duc, Phung Anh. "ASSESS THE DENITRIFICATION POTENTIAL OF FERMENTED BIOSOLIDS BASED ON THEIR SPECIFIC DENITRIFICATION RATE (SDNR)." Vietnam Journal of Science and Technology 54, no. 2A (March 19, 2018): 112. http://dx.doi.org/10.15625/2525-2518/54/2a/11919.

Full text
Abstract:
The study examined the potential of fermented and dark-fermented biosolids as external carbon sources for denitrification improvement. This was done by up-scaling the selected two (out of seven) sludge fermentation conditions from past studies, carrying out ammonia stripping pre-treatment to fix the C/N ratio, before finding their specific denitrification rate (SDNR) using SDNR experiment set-up. The gotten SDNR were then compared to the SDNR of other substances gotten from both previous studies and literature, to weight the denitrification potential of fermented biosolids as a substance. The results found that with an initial COD of 607-704 mgCOD/L, the SDNR of the two fermented biosolids and dark fermented biosolids were found to be 8.35 ± 0.41 and 8.56 ± 0.71 respectively. This was much higher than the 1.53 -2.57 for sucrose and 1.29 ± 0.21 for wastewater found in earlier study using the same methodology; and comparable to the denitrification potential value for the well-studied methanol
APA, Harvard, Vancouver, ISO, and other styles
10

Mikawa, Kazuhiro, Hiroyoshi Emori, Tadashi Takeshima, Eiichi Ishiyama, and Kazuhiro Tanaka. "High rate and compact two-stage post-denitrification process with single-sludge pre-denitrification." Water Science and Technology 34, no. 1-2 (July 1, 1996): 467–75. http://dx.doi.org/10.2166/wst.1996.0405.

Full text
Abstract:
For the sewage treatment plants near rivers and closed water bodies in urbanized areas there is a growing demand for introduction of advanced treatment processes for nitrogen and phosphorus removal for water quality conservation and environmental protection. In order to achieve the total nitrogen content of below 10 mg/L in effluent, a compact single sludge pre-denitrification process by dosing immobilized pellets in the nitrification tank (PEGASUS process) has been already developed (Tanaka et al. 1992). Furthermore, a two-stage PEGASUS process and a PEGASUS process with post-denitrification were developed and investigated for nitrogen removal. Both processes achieved the total nitrogen of less than 5mg/L.
APA, Harvard, Vancouver, ISO, and other styles
More sources

Dissertations / Theses on the topic "Denitrification rate"

1

Richens, Jared. "Evaluating the Impact of External Carbon Source in Laboratory-Based Denitrification Rate Experiments." DigitalCommons@USU, 2018. https://digitalcommons.usu.edu/etd/6912.

Full text
Abstract:
Limitations in the quality of transformation rates used with water quality models such as QUAL2K have led to the need to identify methods that can effectively and accurately determine these rates. During the early stages of method development of a Utah Department of Environmental Quality (Utah DEQ) funded project seeking to identify such methods, it was determined that under certain situations external carbon amendment may be required to successfully determine denitrification rates. The focus of this study was to evaluate the potential impacts that introducing external carbon sources may have on estimating the laboratory denitrification rates resulting from these methods. Ultimately it was shown that, carbon amendment does not negatively impact the comparability of laboratory-generated rates to those that could be measured using in-situ methods. Additionally, it was determined that the Substrate Chemical Product method discussed herein should be used along with a no carbon, glucose, and sodium acetate amended treatments. After analysis of the data, the highest rate should be used if differences caused by carbon amendment can be identified.
APA, Harvard, Vancouver, ISO, and other styles
2

Elmi, Abdirashid A. "Denitrification in sandy loam soil as influenced by water table depth and nitrogen fertilization rate." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape10/PQDD_0003/MQ44163.pdf.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Kjellin, Johan. "Coupled Hydrological and Microbiological Processes Controlling Denitrification in Constructed Wetlands." Licentiate thesis, Stockholm : [Mark- och vattenteknik, Kungliga Tekniska högskolan], 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4370.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Yatham, Venkata Krishna Reddy. "Study of Nitrogen Removal Rate and Trouble shooting of Pilot plant (ITEST)." Thesis, KTH, Mark- och vattenteknik (flyttat 20130630), 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-171806.

Full text
Abstract:
This paper is about improving the efficiency of nitrogen and other organic nutrient removal from activated sewage treatment by adopting an innovative technology. The work is to study the changes in nitrogen removal in pilot-scale experiments with the ITEST unit. The report also describes the various sources contributing to the eutrophication of the sea and water, caused by an increase in nutrient levels in different water bodies. Ineffective treatment of sewage contributes to the eutrophication. In the Baltic regions the temperature will be zero (0) or less than zero degree-centigrade during winter season. It results in decreased or fall in temperatures of incoming water to wastewater treatment plants. The temperature is an important parameter for sewage/wastewater treatment processes. Bacteriological nitrification and denitrification is an effective process for removing nitrogen from wastewater. From various research works and articles, it can be found that 23 + / - 2 °C, is the optimum temperature for nitrification and denitrification processes. So, the main aim is to study the effect of maintaining the incoming wastewater temperature by use of heat exchangers on incoming water to an activated sludge process line in pilot plant scale. In the pilot plant there were two testing lines; one line with heating system and the second line without heating system. A temperature of 19 to 20 °C was maintained in the influent to testing line. The nitrogen removal rates were compared between the two lines during the test period of approximately more than 8 months. Other biological activities in the treatment process were also compared between the two lines.
APA, Harvard, Vancouver, ISO, and other styles
5

Ersan, Yusuf Cagatay. "The Effects Of Seed Sludge Type And Anoxic/aerobic Period Sequence On Aerobic Granulation And Cod, N Treatment Performance." Master's thesis, METU, 2013. http://etd.lib.metu.edu.tr/upload/12615330/index.pdf.

Full text
Abstract:
The aim of this master thesis study was improvement of the required operational conditions for aerobic granulation in sequencing batch reactors (SBRs). In the first part of the study, membrane bioreactor sludge (MBS) and conventional activated sludge (CAS), were used to investigate the effect of suspended seed sludge type on granulation in SBRs. The MBS granules were found to be advantageous in terms of size, resistance to toxic effects, stability and recovery compared to CAS granules. During non-inhibitory conditions, sCOD removal efficiencies were 70±
13% and 67±
11% for MBS and CAS, and total nitrogen (TN) removal efficiencies were 38±
8% and 26±
8%, respectively. In the second part of the study, the effects of period sequence (anoxic-aerobic and aerobic-anoxic) on aerobic granulation from MBS, and sCOD, N removal efficiencies were investigated. Granules developed in anoxic-aerobic period sequence were more stable and larger (1.8-3.5 mm) than granules developed in aerobic-anoxic sequence. Under steady conditions, almost 95% sCOD, 90% Total Ammonia Nitrogen (TAN) and around 39-47 % of TN removal was achieved. Almost 100% denitrification in anoxic period was achieved in anoxic-aerobic period sequence and it was observed around 40% in aerobic-anoxic period sequence. The effects of influent sulfate (from 35.1 mg/L to 70.2 mg/L) on treatment efficiencies of aerobic granules were also investigated. The influent SO42- concentrations of 52.6 mg/L to 70.2 mg/L promoted sulfate reduction. The produced sulfide (0.24 mg/L to 0.62 mg/L) inhibited the ammonia-oxidizing bacteria (AOB) performance by 10 to 50%.
APA, Harvard, Vancouver, ISO, and other styles
6

Thunberg, Andreas. "Energieffektivisering av luftningssteget på Käppalaverket, Lidingö." Thesis, Uppsala University, Department of Earth Sciences, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-88824.

Full text
Abstract:

This master thesis in energy optimization was made during the autumn of 2006 at Käppala wastewater treatment plant in Lidingö, Stockholm. A preceding thesis, where all electricity consumption was mapped, showed that the aeration in the biological treatment is the single largest consumer in the plant, and it is therefore of interest to reduce this cost. The oxygen control strategy used at Käppala WWTP is working well from a nutrient removal point of view, but not from an economic one. The last aerobic zones have a very low oxygen consumption during low loading periods which give rise to enhanced dissolved oxygen concentrations with excessive costs and reduced denitrification as a result. But also during periods of normal loading unnecessary high oxygen concentration are sometimes given.

By modifying the aeration control strategy three full-scale experiments have been made, with the intention to reduce the air consumption. The experiments were carried out during week 37-50 in the autumn of 2006 and showed that savings could be made.

The regular oxygen control at Käppala WWTP controls the oxygen level in the aerobic compartment with two DO-setpoints; one in the first aerobic zone and one in the last. The zones in between are controlled by an airflow fractionation depending on the oxygen level in the first and last zone. In the first strategy to be evaluated, all four zones in the aerated part were individually controlled with its own setpoint. Two different setpoint combinations were tested. By using the fact that the efficiency in the oxygen transfer rate was higher at low airflows, savings of approximately 16 % were achieved. In the second strategy tested, an ammonia-feedback control combined with a DO-feedback controlled the DO-set point in the first aerobic zone. This strategy adjusted the DO- set points to the loading variations, and this gave a decreased airflow of approximately 9 %. Finally the two strategies were combined. All zones were then controlled individually with DO-set points set by an ammonium-feedback and a DO-feedback. The strategy gave savings in the airflow of approximately 18 %. In all three trials the aerated zones were more efficiently used, and the estimated savings are 550 000 SEK/year, and with a preserved nutrient removal efficiency.


Under hösten 2006 har ett examensarbete om energieffektivisering på Käppalaverket på Lidingö utförts. Ett föregående examensarbete där all elenergiförbrukning kartlades visade att blåsmaskinerna i biosteget står för den enskilt största förbrukningen i verket och det är därför av intresse att minska denna kostnad. Syrestyrningsstrategin som används på Käppalaverket fungerar mycket bra ur reningssynpunkt, men är inte optimal ur energisynpunkt. Dels luftas de första aeroba zonerna för mycket vid låg belastning vilket ger upphov till kraftigt förhöjda syrekoncentrationer i de sista aeroba zonerna med höga luftningskostnader och risk för försämrad denitrifikation, men även under normal belastning har det visat sig att onödigt höga syrekoncentrationer ibland ges.

Tre fullskaliga optimeringsförsök har utförts, med syfte att minska luftförbrukningen med bibehållen reningsgrad. Försöken pågick från vecka 37 till 50 hösten 2006, och visade att det finns möjlighet att spara energi genom att modifiera syrestyrningsstrategin.

Den reguljära syreregleringen i Käppalaverket styr syrehalten i den aeroba bassängen mot två syrebörvärden; ett i den första luftade zonen och ett i den sista. Luftflödet till de mellanliggande zonerna styrs av luftflödesandelar beroende på syrehalten i dessa två zoner. Den första strategin som utvärderades styrde istället samtliga zoner individuellt med egna börvärden, där två olika strukturer på de satta börvärdena användes. Genom att utnyttja en högre effektivitet i syreöverföringshastigheten vid låga luftflöden uppnåddes luftflödesbesparingar på ca 16 % i första försöket.

I den andra strategin styrdes syrebörvärdet i den första luftade zonen med hjälp av två återkopplingar, en från utgående ammoniumhalt och en från syrehalten i den sista luftade zonen.

Tack vare att strategin anpassade syrebörvärdena efter belastningen av syretärande ämnen erhölls luftflödesbesparingar på ca 9 %. Slutligen kombinerades de två strategierna; samtliga zoner styrdes individuellt med börvärden satta av en ammonium-återkoppling och en syre-återkoppling. Strategin medförde luftflödesbesparingar på ca 18 %. I samtliga försök utnyttjades de luftade zonerna bättre, och besparingspotentialen uträknad från 2005 års elpriser blev som mest 550 000 SEK/år, detta med en bibehållen reningsgrad.

APA, Harvard, Vancouver, ISO, and other styles
7

Bamber, Kevin William. "Nitrogen Cycling from Fall Applications of Biosolids to Winter Small Grains." Thesis, Virginia Tech, 2015. http://hdl.handle.net/10919/71870.

Full text
Abstract:
Environmental concerns about winter nitrogen (N) leaching loss limit the amount of biosolids applied to winter small grains in Virginia. Ten field studies were established 2012-2014 in Virginia to determine the agronomic and environmental feasibility of fall biosolids applications to soft red winter wheat (Triticum aestivum L.). Eight studies were located in the Coastal Plain physiographic province and two in the Ridge and Valley physiographic province. The effects of eight biosolids and urea N treatments on 1) biomass production at Zadoks growth stage (GS) 25-30, 2) soil inorganic N at GS 25-30, 3) soil mineralizable N at GS 25-30,4) N use efficiency (NUE) at GS 58, 5) grain yield, 6) end-of-season soil inorganic N, and 7) estimated N recovery were studied. Anaerobically digested (AD) and lime stabilized (LS) biosolids were fall applied at estimated plant available N (PAN) rates of 100 kg N ha-1 and 50 kg N ha-1. The 50 kg N ha-1 biosolids treatments were supplemented with 50 kg N ha-1 as urea in spring. Urea N was split applied at 0, 50, 100 and 150 kg N ha-1, with 1/3 applied in fall and 2/3 in spring. Biomass at GS 25-30 increased with urea N rate and biosolids always resulted in equal or greater biomass than urea. Soil mineralizable N at GS 25-30 rarely responded to fall urea or biosolids N rate, regardless of biosolids type. Biosolids and urea applied at the agronomic N rate resulted in equal grain yield and estimated N recovery in soils where N leaching loss risk was low, regardless of biosolids type or application strategy. Lime stabilized biosolids and biosolids/urea split N application increased grain yield and estimated N recovery in soils with high or moderate N leaching loss risk. Therefore, AD and LS biosolids can be fall-applied to winter wheat at the full agronomic N rate in soils with low N leaching loss risk, while LS biosolids could be applied to winter wheat at the full agronomic N rate in soils with moderate or high N leaching loss risk.
Master of Science
APA, Harvard, Vancouver, ISO, and other styles
8

Watkins, Natalie Lisa. "The ability of nitrification inhibitors to decrease denitrification rates in dairy farm soils." The University of Waikato, 2007. http://hdl.handle.net/10289/2518.

Full text
Abstract:
Increasing pressure is being placed on the dairy industry to reduce nitrogen losses from soil. Nitrification inhibitors are a management strategy that could be implemented on dairy farms to help reduce losses of nitrogen. Nitrification inhibitors work by temporarily inhibiting the microbial conversion of soil ammonium to nitrate. Past trials have indicated that nitrification inhibitors can increase grass production and decrease nitrate leaching; however, little is known about the long-term effects on other soil nitrogen processes such as denitrification. Denitrification rates in soils can be limited by the availability of substrate (carbon and nitrate) and by insufficient anaerobic microsites. The objective of this thesis was to establish whether the nitrification inhibitor, dicyandiamide (DCD), could decrease denitrification rates in dairy farm soils by limiting nitrate availability. A field trial was established at Dexcel's research farm near Hamilton, New Zealand on a Typic Orthic Allophanic Soil. Twenty replicated field plots were established in a paddock, ten plots acted as controls and ten plots had DCD applied to the soil once a month at a rate of 30 kg ha-1 yr-1. Denitrification rates were measured using the acetylene inhibition technique on intact soil cores. Ammonium and nitrate concentration, soil carbon availability, denitrifying enzyme activity and soil pH were measured from soil samples collected monthly. Two further field experiments and one laboratory experiment were undertaken. The distribution of denitrifying enzyme activity with soil depth was measured to ensure that the depth to which denitrification was sampled (15 cm) in the field experiment was sufficient. DCD degradation in the field during 20 days was measured to establish how long the effects of DCD might last. A laboratory study investigated whether DCD would decrease denitrifying enzyme activity in soil, when soil conditions were optimized for denitrification. More than 80% of the denitrifying enzyme activity occurred in the top 15 cm of the soil profile, indicating that the depth to which samples were collected was sufficient. There was no significant decrease in denitrification rates in the field experiment when DCD was added. Nitrification was partially inhibited as shown by a significant increase in soil ammonium (+14%) and a significant decline in soil nitrate (-17%) in the DCD-amended soils compared to the control soils. However, the decline in soil nitrate was not great enough for nitrate to limit denitrification. Nitrate concentrations were consistently greater than 5 mg NO3- kg-1 soil (the proposed threshold for declines in denitrification). The laboratory study supported the field study with DCD having no effect on denitrifying enzyme activity and nitrate concentrations remaining above 5 mg NO3- kg-1 soil. So while DCD reduced nitrification rates and the formation of nitrate, denitrification rates were not limited by nitrate availability. DCD was completely degraded in the soil 19 days after DCD application, with a half-life of 2.9 days, which may be a reason for the minor inhibition of nitrification. Denitrifying enzyme activity, carbon availability and soil pH were all unaffected by the application of DCD.
APA, Harvard, Vancouver, ISO, and other styles
9

Olsson, Camilla. "Nitrous Oxide in Himmerfjärden: Seasonal Variability in Production Rates and Fluxes." Thesis, Stockholms universitet, Institutionen för geologiska vetenskaper, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-119634.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

Machado, Ana Margarida Pinto Henrique. "" Influence of Marsh Flora on Denitrification Rates and the Abundance and Community Structure of Denitrifying "." Dissertação, Instituto de Ciências Biomédicas Abel Salazar, 2010. http://hdl.handle.net/10216/57201.

Full text
APA, Harvard, Vancouver, ISO, and other styles
More sources

Books on the topic "Denitrification rate"

1

Molot, Lewis A. Nitrogen mass balances and denitrification rates in Central Ontario lakes. [Toronto]: Queen's Printer for Ontario, 1993.

Find full text
APA, Harvard, Vancouver, ISO, and other styles

Book chapters on the topic "Denitrification rate"

1

Joyce, Alyssa, Mike Timmons, Simon Goddek, and Timea Pentz. "Bacterial Relationships in Aquaponics: New Research Directions." In Aquaponics Food Production Systems, 145–61. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-15943-6_6.

Full text
Abstract:
AbstractThe growth rates and welfare of fish and the quality of plant production in aquaponics system rely on the composition and health of the system’s microbiota. The overall productivity depends on technical specifications for water quality and its movement amongst components of the system, including a wide range of parameters including factors such as pH and flow rates which ensure that microbial components can act effectively in nitrification and remineralization processes. In this chapter, we explore current research examining the role of microbial communities in three units of an aquaponics system: (1) the recirculating aquaculture system (RAS) for fish production which includes biofiltration systems for denitrification; (2) the hydroponics units for plant production; and (3) biofilters and bioreactors, including sludge digester systems (SDS) involved in microbial decomposition and recovery/remineralization of solid wastes. In the various sub-disciplines related to each of these components, there is existing literature about microbial communities and their importance within each system (e.g. recirculating aquaculture systems (RAS), hydroponics, biofilters and digesters), but there is currently limited work examining interactions between these components in aquaponics system, thus making it an important area for further research.
APA, Harvard, Vancouver, ISO, and other styles
2

Bartoli, M., G. Castaldelli, D. Nizzoli, L. G. Gatti, and P. Viaroli. "Benthic Fluxes of Oxygen, Ammonium and Nitrate and Coupled-uncoupled Denitrification Rates within Communities of Three Different Primary Producer Growth Forms." In Mediterranean Ecosystems, 225–33. Milano: Springer Milan, 2001. http://dx.doi.org/10.1007/978-88-470-2105-1_29.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Inubushi, Kazuyuki, and Miwa Yashima. "Mitigation of Climate Change by Nitrogen Managements in Agriculture." In Nitrogen in Agriculture - Physiological, Agricultural and Ecological Aspects [Working Title]. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.99972.

Full text
Abstract:
Soil is one of the important sources of nitrous oxide (N2O), which is generally producing through soil microbial processes, such as nitrification and denitrification. Agricultural soils receive chemical and organic fertilizers to maintain or increase crop yield and soil fertility, but several factors are influencing N2O emissions, such as types and conditions of soil and fertilizer, and rate, form, and timing of application. Mitigation of N2O is a challenging topic for future earth by using inhibitors, controlled-release fertilizers, and other amendments, but the cost and side effects should be considered for feasibility.
APA, Harvard, Vancouver, ISO, and other styles
4

Ali, Nawab, and Mohammad Akmal. "Morphophysiological Traits, Biochemical Characteristic and Productivity of Wheat under Water and Nitrogen-Colimitation: Pathways to Improve Water and N Uptake." In Abiotic Stress in Plants [Working Title]. IntechOpen, 2020. http://dx.doi.org/10.5772/intechopen.94355.

Full text
Abstract:
Drought stress is the most prominent limiting factor and abiotic stress that manipulates the physiological pathway, biochemical traits and hence negatively affects wheat crop productivity. The global nitrogen (N) recovery indicated that about two-fifths of N inputs are lost in the ecosystems through emission, denitrification, gaseous loss, leaching, surface runoff and volatilization etc. Farmers are using higher rates of N to harvest maximum yield but about 50–60% of applied N to crop field is not utilized by the plants and are lost to environment causing environmental pollution. These deleterious environmental consequences need to be reduced by efficient management of N and/or water. N-availability is often regulated by soil water; hence crop is experiencing N- and water-limitation simultaneously. There is great impetus to optimize their uptake through interconnectedness of water and N for yield determination of wheat because of the water scarcity and N losses. It is further advocate that there is need to investigate the intricate role of economizing N rate and water simultaneously for wheat crop growth, yield and backing quality may be beneficial to be investigate.
APA, Harvard, Vancouver, ISO, and other styles
5

Peter-Contesse, Hayley. "Measuring Denitrification Rates in Soil." In Reference Module in Earth Systems and Environmental Sciences. Elsevier, 2017. http://dx.doi.org/10.1016/b978-0-12-409548-9.10655-4.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

Seitzinger, Sybil P. "Denitrification and Nitrification Rates in Aquatic Sediments." In Handbook of Methods in Aquatic Microbial Ecology, 633–41. CRC Press, 2018. http://dx.doi.org/10.1201/9780203752746-75.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

Barnard, James L., and P. G. J. Meiring. "SOURCES OF HYDROGEN DONORS AND THEIR EFFECTS ON DENITRIFICATION RATES." In Proceedings of the Conference on Nitrogen As a Water Pollutant, 577–88. Elsevier, 2013. http://dx.doi.org/10.1016/b978-1-4832-1344-6.50041-1.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

Henze, Mogens. "THE INFLUENCE OF RAW WASTEWATER BIOMASS ON ACTIVATED SLUDGE OXYGEN RESPIRATION RATES AND DENITRIFICATION RATES." In Water Pollution Research and Control Brighton, 603–7. Elsevier, 1988. http://dx.doi.org/10.1016/b978-1-4832-8439-2.50061-4.

Full text
APA, Harvard, Vancouver, ISO, and other styles
9

Rene, Eldon R., Sung Joo Kim, Dae Hee Lee, Woo Bong Je, Mirian Estefanía López, and Hung Suck Park. "Artificial Neural Network Modelling of Sequencing Batch Reactor Performance." In Handbook of Research on Computational Science and Engineering, 456–79. IGI Global, 2012. http://dx.doi.org/10.4018/978-1-61350-116-0.ch019.

Full text
Abstract:
Sequencing batch reactor (SBR) is a versatile, eco-friendly, and cost-saving process for the biological treatment of nutrient-rich wastewater, at varying loading rates. The performance of a laboratory-scale SBR was monitored to ascertain the chemical oxygen demand (COD) and total nitrogen (T-N) removals under four different operating conditions, by varying the operating time for the nitrification/denitrification steps, i.e., the cycle times. A multi-layered neural network was developed using COD, T-N, carbon to nitrogen ratio (C/N), aeration time, and mixed liquor suspended solids concentration (MLSS) data. This chapter compares the neural simulation results to the experimental results and extracts information on the significant factors affecting SBR performance. The application of artificial neural networks to biological processes such as SBR is a relatively new technique in wastewater and water quality management, and the results presented herein indicate the promising start of the adoption of computational science in this domain of research.
APA, Harvard, Vancouver, ISO, and other styles

Conference papers on the topic "Denitrification rate"

1

Cheng, Donghui, Mingzhu Liu, Honghan Chen, Jiangtao He, Guoping He, and Jian Lin. "Estimation Method of Denitrification Rate Constant in Aquifer." In 2010 4th International Conference on Bioinformatics and Biomedical Engineering (iCBBE). IEEE, 2010. http://dx.doi.org/10.1109/icbbe.2010.5517951.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

"Applications and Rate-limiting Parameters of Aerobic Denitrification." In 2018 3rd International Conference on Life Sciences, Medicine, and Health. Francis Academic Press, 2018. http://dx.doi.org/10.25236/iclsmh.18.033.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Daoming, Guan, Fan Jingfeng, Chen Jiayin, Shi Feng, Ming Hongxia, Chen Liguang, and Zhao Huade. "Seasonal Variation of Denitrification Rate in Estuary Sediments of Liaohe, China." In 2013 Third International Conference on Intelligent System Design and Engineering Applications (ISDEA). IEEE, 2013. http://dx.doi.org/10.1109/isdea.2012.295.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Wang, Sitan, Weiwei Fu, and Xuying Guo. "Study on Nitrate Rate from Groundwater with Shortcut Nitrification-denitrification A/O Membrane Bioreactor." In 2010 4th International Conference on Bioinformatics and Biomedical Engineering (iCBBE). IEEE, 2010. http://dx.doi.org/10.1109/icbbe.2010.5517966.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Maria B Tucholke, John E McCray, Geoffrey D Thyne, and Reagan M Waskom. "Correlating Denitrification Rates to Soil Texture using Hierarchical Cluster Analysis." In Eleventh Individual and Small Community Sewage Systems Conference Proceedings, 20-24 October 2007, Warwick, Rhode Island. St. Joseph, MI: American Society of Agricultural and Biological Engineers, 2007. http://dx.doi.org/10.13031/2013.23983.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

Song, K., M. Y. Song, T. S. Chon, and H. Kang. "Modeling of denitrification rates in eutrophic wetlands by artificial neural networks." In ENVIRONMENTAL TOXICOLOGY 2006. Southampton, UK: WIT Press, 2006. http://dx.doi.org/10.2495/etox060081.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

Rogers, David Brian. "QUANTIFYING DENITRIFICATION RATES IN A BIOMASS PRODUCTION AND NUTRIENT RECOVERY SITE." In GSA Annual Meeting in Indianapolis, Indiana, USA - 2018. Geological Society of America, 2018. http://dx.doi.org/10.1130/abs/2018am-320933.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

Kozub, Darlene D., and Sarah K. Liehr. "Measurement of Denitrification Rates in a Constructed Wetland Receiving Municipal Solid Waste Landfill Leachate." In Wetlands Engineering and River Restoration Conference 1998. Reston, VA: American Society of Civil Engineers, 1998. http://dx.doi.org/10.1061/40382(1998)188.

Full text
APA, Harvard, Vancouver, ISO, and other styles
9

Li, Lingling, Bo Yang, and Maojuan Bai. "Impact of High Salinity on Specific Oxygen Uptake, Nitrification and Denitrification Rates of Activated Sludge." In 2009 3rd International Conference on Bioinformatics and Biomedical Engineering (iCBBE). IEEE, 2009. http://dx.doi.org/10.1109/icbbe.2009.5162926.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

Li, Wei, Guoming Zhang, and Zhaojun Li. "Study on the Nitrous Oxide Emission and Denitrification Losses from Loess Plateau under Different Water Regimes and Nitrogen Fertilizer Rates." In 2008 International Workshop on Education Technology and Training & 2008 International Workshop on Geoscience and Remote Sensing. IEEE, 2008. http://dx.doi.org/10.1109/ettandgrs.2008.30.

Full text
APA, Harvard, Vancouver, ISO, and other styles
You might also be interested in the extended bibliographies on the topic 'Denitrification rate' for particular source types:
Journal articles Dissertations / Theses
We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!

To the bibliography