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Journal articles on the topic 'Denitrification processe'

Author: Grafiati

Published: 9 March 2023

Last updated: 31 July 2025

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1

Zhu, Minyi, Minhui Ma, Shuo Chen, Rongfang Yuan, and Shaona Wang. "Study on the Synchronous Removal of Nitrogen and Phosphorus by Autotrophic/Heterotrophic Denitrification in the Presence of Pyrite." Molecules 30, no. 11 (2025): 2412. https://doi.org/10.3390/molecules30112412.

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Pollution caused by N and P is a significant contributor to water eutrophication. While traditional biological treatment processes can remove some N and P elements from water, the effluent quality often fails to meet the stringent requirements of sensitive areas. The autotrophic denitrification’s simultaneous nitrogen and phosphorus removal pro-cess, known for its low operating cost and minimal sludge production, has garnered considerable attention from researchers. In this study, natural pyrite was used for the removal of nitrogen and phosphorus in a denitrification system, and the underlying

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2

Pániková, Kristína, Zuzana Bílková, and Jitka Malá. "The Behavior of Terbuthylazine, Tebuconazole, and Alachlor during Denitrification Process." Journal of Xenobiotics 13, no. 4 (2023): 560–71. http://dx.doi.org/10.3390/jox13040036.

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Pesticide compounds can influence denitrification processes in groundwater in many ways. This study observed behavior of three selected pesticides under denitrifying conditions. Alachlor, terbuthylazine, and tebuconazole, in a concentration of 0.1 mL L−1, were examined using two laboratory denitrifications assays: a “short” 7-day and a “long” 28-day test. During these tests, removal of pesticides via adsorption and biotic decomposition, as well as the efficiency of nitrate removal in the presence of the pesticides, were measured. No considerable inhibition of the denitrification process was ob

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3

de Beer, Dirk, Andreas Schramm, Cecilia M. Santegoeds, and Helle K. Nielsen. "Anaerobic processes in activated sludge." Water Science and Technology 37, no. 4-5 (1998): 605–8. http://dx.doi.org/10.2166/wst.1998.0726.

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We found anoxic zones in aerated activated sludge flocs, and demonstrated denitrification under normal operating conditions. Sulfate reduction was not found. Micro-environments and microbial conversions in flocs from bulking and non-bulking activated sludge were determined with microsensors for H2S, O2, NO2− and NO3−. Denitrification and sulfate reduction rates were mmeasured with 15N- and 35S-tracer techniques. We showed that under normal reactor conditions (ca. 20% air saturation) anoxic zones develop within flocs allowing denitrification. The denitrification rates amounted to 40% of the rat

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4

Kuenen, J. Gijs, and Lesley A. Robertson. "Combined nitrification-denitrification processes." FEMS Microbiology Reviews 15, no. 2-3 (1994): 109–17. http://dx.doi.org/10.1111/j.1574-6976.1994.tb00129.x.

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5

Tonkovic, Zlatko. "Energetics of enhanced biological phosphorus and nitrogen removal processes." Water Science and Technology 38, no. 1 (1998): 177–84. http://dx.doi.org/10.2166/wst.1998.0043.

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Recent advances by researchers with in vivo NMR spectroscopy using labelled isotopes of carbon and phosphorus have elucidated some of the biochemical pathways involved in enhanced biological phosphorus and nitrogen removal processes. This has permitted a greater understanding of carbon and phosphorus cycling within cellular processes. All microbiological processes associated with energy transformations are dependent on enzyme induction. The enhanced phosphorus removal apparatus in certain organisms is dependent on the environmental conditions in order to induce the necessary enzymes. Enzyme ex

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6

Schneider, Irina, Ivaylo Yotinov, Nora Dinova, et al. "Assessment of Denitrification and Nitrification Processes during Landfill Leachate Treatment." Processes 11, no. 10 (2023): 2960. http://dx.doi.org/10.3390/pr11102960.

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Landfill leachate is generated from waste degradation in landfill sites, and its treatment includes biological or combined treatment with physico-chemical methods. A frequently applied technology in the biological stage of landfill leachate treatment plants is based on denitrification and nitrification. Nevertheless, with the availability of a huge number of scientific reports, the management of denitrification and nitrification (D/N) processes in the frame of real wastewater treatment plants (WWTPs) is rather difficult and always remains a critical technological problem. This study aims to pe

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7

Lv, Shuai-Shuai, Yu Zhang, Hong-Jun Ni, Xing-Xing Wang, Wei-Yang Wu, and Chun-Yu Lu. "Effects of Additive and Roasting Processes on Nitrogen Removal from Aluminum Dross." Coatings 12, no. 6 (2022): 730. http://dx.doi.org/10.3390/coatings12060730.

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Taking high nitrogen aluminum dross as the research object, the effects of the additives sodium carbonate and cryolite and the roasting process on the denitrification effect of aluminum dross were studied. The principle of additive denitrification was studied by XRD, SEM and TG-DSC. The experimental results show that sodium carbonate and cryolite can quickly reduce the content of aluminum nitride in aluminum dross. The optimum denitrification process parameters were also obtained simultaneously. When the mass ratio of cryolite to aluminum dross was 0.4, the roasting temperature was 900 °C, and

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8

Yin, Fang-Fang, and Hui-Fang Guo. "Influence of additional methanol on both pre- and post-denitrification processes in treating municipal wastewater." Water Science and Technology 85, no. 5 (2022): 1434–43. http://dx.doi.org/10.2166/wst.2022.060.

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Abstract Changes in functional properties of biological denitrification in the long-term use of methanol were explored in both pre- and post-denitrification processes. The two systems employed were sequencing batch reactor (SBR) using post-denitrification in temporal sequence, and Carrousel oxidation ditch, which was equipped with a separate pre-denitrification zone. In the SBR, stable nitrate reduction rates reached after 37 days elapsed with addition of methanol (TOC/N = 1.4–1.8) at the start of anoxic phase, and specific denitrification rate increased from 0.378 mgNOx-N·(gVSS·h)−1 to 2.406

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9

Sözen, S., N. Artan, D. Orhon, and E. Avcioglu. "Assessment of the denitrification potential for biological nutrient removal processes using OUR/NUR measurements." Water Science and Technology 46, no. 9 (2002): 237–46. http://dx.doi.org/10.2166/wst.2002.0248.

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The denitrification potential, a key parameter in nutrient removal activated sludge systems, is mathematically described in terms of mass balance expressions for different carbon sources, namely, easily biodegradable substrate, slowly biodegradable substrate and biomass. Mass balance was derived both for single-anoxic (pre-denitrification) and dual anoxic (Bardenpho) systems. Correction factors for anoxic growth were experimentally determined using respirometry for domestic sewage and meat processing wastewater. The denitrification potential expressions were evaluated for different process con

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10

Qiu, Gao Shun, Ling Feng Qiu, and Yi Ming Chen. "The Realization of Nitrification and Denitrification Processes in Low C/N Sewage." Advanced Materials Research 233-235 (May 2011): 600–603. http://dx.doi.org/10.4028/www.scientific.net/amr.233-235.600.

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The influences of HRT, C/N ratio on simultaneous nitrification and denitrification (SND) and the rule of pH in a sequencing batch reactor (SBR) were investigated while treating low C/N synthetic municipal wastewater. The results showed that the function of SND became more outstanding and the removal rate of TN, NH4+-N was improved greatly by lengthening HRT appropriately; when the C/N increased, the denitrification effect of the simultaneous nitrification and denitrification would be improved; .At the same time, the variation of pH value was well related to ammonia oxidation. So that judgment

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11

Mees, Juliana Bortoli Rodrigues, Simone Damasceno Gomes, and Rosemeri Cristina Dallago. "Conventional and new concepts of biological treatment processes for the nitrogen removal from wastewater." Revista Eletrônica Científica Inovação e Tecnologia 3, no. 5 (2012): 2. http://dx.doi.org/10.3895/recit.v3.n5.4154.

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Nitrogenous compounds are predominant in many wastewater and need treatment prior to discharge in order to prevent oxygen depletion and eutrophication of surface water bodies. Nitrogen removal is usually accomplished through sequential nitrification and denitrification processes. Here, it is presented a review of the conventional biological nitrogen removal by nitrification-denitrification and also some processes that make use of new concepts, as: Anammox, Sharon, and Simultaneous nitrification and denitrification (SND).

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12

Naqvi, S. W. A. "Denitrification processes in the Arabian Sea." Journal of Earth System Science 103, no. 2 (1994): 279–300. http://dx.doi.org/10.1007/bf02839539.

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13

Deng, Weifeng, Litao Wang, Lang Cheng, Wenbo Yang, and Dawen Gao. "Nitrogen Removal from Mature Landfill Leachate via Anammox Based Processes: A Review." Sustainability 14, no. 2 (2022): 995. http://dx.doi.org/10.3390/su14020995.

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Mature landfill leachate is a complex and highly polluted effluent with a large amount of ammonia nitrogen, toxic components and low biodegradability. Its COD/N and BOD5/COD ratios are low, which is not suitable for traditional nitrification and denitrification processes. Anaerobic ammonia oxidation (anammox) is an innovative biological denitrification process, relying on anammox bacteria to form stable biofilms or granules. It has been extensively used in nitrogen removal of mature landfill leachate due to its high efficiency, low cost and sludge yield. This paper reviewed recent advances of

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14

Heggie, David T., Graham W. Skyring, Joseph Orchardo, Andrew R. Longmore, Geoffrey J. Nicholson, and William M. Berelson. "Denitrification and denitrifying efficiencies in sediments of Port Phillip Bay: direct determinations of biogenic N2 and N-metabolite fluxes with implications for water quality." Marine and Freshwater Research 50, no. 6 (1999): 589. http://dx.doi.org/10.1071/mf98054.

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High-precision measurements of N2 in benthic chamber waters indicated that denitrification occurs within the major sedimentary facies in Port Phillip Bay. The integrated fluxes of biogenic N2 , ammonia, nitrate and nitrite showed that the stoichiometric relationship between organic C and N in the muddy sediments, occupying about 70% of the seafloor, was 5.7, this being similar to the Redfield ratio of 6.6. High denitrifying efficiencies (75–85%; denitrification rates ~1.3 mmol N2 m–2 day–1) at organic carbon loadings of ~15–25 mmol m–2 day–1 indicate that most N processed through the sediments

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15

Wentzel, M. C., G. A. Ekama, and G. v. R. Marais. "Processes and Modelling of Nitrification Denitrification Biological Excess Phosphorus Removal Systems – A Review." Water Science and Technology 25, no. 6 (1992): 59–82. http://dx.doi.org/10.2166/wst.1992.0114.

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This paper reviews developments in modelling the kinetics of activated sludge systems: Completely aerobic nitrification, anoxic/aerobic nitrification denitrification (ND), and anaerobic/anoxic/aerobic nitrification denitrification biological excess phosphorus removal (NDBEPR) systems. The paper highlights the progress in developing a general NDBEPR activated sludge kinetic model – development of polyP organism enhanced cultures, their kinetics, simplification of the kinetics for enhanced cultures under constant flow and load conditions, extension of the simplified model to mixed culture NDBEPR

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16

Capodaglio, Andrea G., Petr Hlavínek, and Massimo Raboni. "Advances in wastewater nitrogen removal by biological processes: state of the art review." Ambiente e Agua - An Interdisciplinary Journal of Applied Science 11, no. 2 (2016): 250. http://dx.doi.org/10.4136/ambi-agua.1772.

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The paper summarizes the state-of-the-art of the most recent advances in biological nitrogen removal, including process design criteria and technological innovations. With reference to the Modified Ludzck Ettinger (MLE) process (pre-denitrification and nitrification in the activated sludge process), the most common nitrogen removal process used nowadays, a new design equation for the denitrification reactor based on specific denitrification rate (SDNR) has been proposed. In addition, factors influencing SDNR (DO in the anoxic reactor; hydrodynamic behavior) are analyzed, and technological solu

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17

McMurray, S. H., R. L. Meyer, R. J. Zeng, Z. Yuan, and J. Keller. "Integration of titrimetric measurement, off-gas analysis and NOx− biosensors to investigate the complexity of denitrification processes." Water Science and Technology 50, no. 11 (2004): 135–41. http://dx.doi.org/10.2166/wst.2004.0681.

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The denitrification process, namely the reduction of nitrate (NO3−) to nitrogen gas (N2), often cannot be simply modelled as a single step process. For a more complete and comprehensive model the intermediates, particularly nitrite (NO2−) and nitrous oxide (N2O), need to be investigated. This paper demonstrates the integration of titrimetric measurements and off-gas analysis with on-line nitrite plus nitrate (NOx−) biosensors, highlighting the necessity of measuring process intermediates with high time-scale resolution to study and understand the kinetics of denitrification. Investigation of a

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18

Ernst, Anneliese, Christian Steinbach, Kai Wagner, and Uwe Waller. "Virtual Sensing of Nitrite: A Novel Control for Safe Denitrification in Recirculating Aquaculture Systems (RASs)." Fishes 9, no. 10 (2024): 398. http://dx.doi.org/10.3390/fishes9100398.

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Recirculating aquaculture system (RAS) technology is seen worldwide as a solution for sustainable fish production. However, there are still deficiencies in the process technology imperiling consistent operation and thus economic results. Drawbacks are linked to essential processes of the water treatment systems such as denitrification. Nitrogenous waste needs to be removed from RAS process water to maintain an adequate production environment for fish and to mitigate the environmental impact of discharged process water. At present, denitrification lacks reliable process control, especially rega

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19

Aioub, Ahmed A. A., Shuquan Jin, Jiezhang Xu, and Qichun Zhang. "Reduction of Nitrogen through Anaerobic Processes in Chinese Rice Paddy Soils." Nitrogen 5, no. 3 (2024): 655–66. http://dx.doi.org/10.3390/nitrogen5030043.

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Comprehending the anaerobic nitrogen transformations, including denitrification, anaerobic ammonium oxidation (anammox), and anaerobic ammonium oxidation linked with iron reduction (Feammox) in soil, is essential for improving soil fertility and minimizing the environmental impacts of nitrogen loss. Despite this, research on anaerobic nitrogen transformations, particularly Feammox in paddy soil, is sparse. This study examined soil denitrification, anammox, and Feammox, along with their respective contributions to nitrogen loss in paddy soil at various depths, under different fertilization and

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20

Dinçer, Ali R., and Fikret Kargı. "Kinetics of sequential nitrification and denitrification processes." Enzyme and Microbial Technology 27, no. 1-2 (2000): 37–42. http://dx.doi.org/10.1016/s0141-0229(00)00145-9.

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21

Collivignarelli, C., and G. Bertanza. "Simultaneous Nitrification-Denitrification Processes in Activated Sludge Plants: Performance and Applicability." Water Science and Technology 40, no. 4-5 (1999): 187–94. http://dx.doi.org/10.2166/wst.1999.0591.

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This paper deals with the development of technologies aimed to upgrade existing waste water treatment plants, paying attention to high process efficiencies and low costs. We established conditions for good N removal efficiencies in extended aeration activated sludge plants which are not equipped with specific denitrification steps. The experimental process is based on establishing conditions in the biological reactor which allow simultaneous nitrification and denitrification without alternating (in time or in space) anoxic and aerobic phases; the aeration system is controlled by means of disso

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22

Beliavski, M., I. Meerovich, S. Tarre, and M. Green. "Biological denitrification of brines from membrane treatment processes using an upflow sludge blanket (USB) reactor." Water Science and Technology 61, no. 4 (2010): 911–17. http://dx.doi.org/10.2166/wst.2010.613.

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This paper investigates denitrification of brines originating from membrane treatment of groundwater in an upflow sludge blanket (USB) reactor, a biofilm reactor without carrier. A simulated brine wastewater was prepared from tap water and contained a nitrate concentration of 125 mg/l as N and a total salt concentration of about 1%. In order to select for a suitable energy source for denitrification, two electron donors were compared: one promoting precipitation of calcium compounds (ethanol), while the other (acetic acid), no precipitation was expected. After extended operation to reach stead

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23

Hao, Lin, and Jiafang Huang. "Effect of Aquaculture Reclamation on Sediment Nitrates Reduction Processes in Mangrove Wetland." Journal of Marine Science and Engineering 10, no. 7 (2022): 857. http://dx.doi.org/10.3390/jmse10070857.

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Sediment denitrification, anaerobic ammonium oxidation (anammox), and nitrate dissimilation to ammonium (DNRA) play an important role in controlling the dynamics of nitrates (NOx−) and their fate in estuarine and coastal ecosystems. However, the effects of land-use change on NOx− reduction processes in mangrove sediments are still unclear. Here, we used a mud experiment method combined with a 15N stable isotope tracer method to study the mechanism and ecological environment of the change of land use pattern on the sediment NOx− reduction processes in mangrove wetlands. Our study showed that mo

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24

Gao, Lin, Chen Liu, Mingcong Li, and Xianbiao Lin. "Sediment Nitrate Dissimilatory Reduction Processes along a Salinity Gradient in an Estuarine and Coastal Wetland, China." Journal of Marine Science and Engineering 10, no. 6 (2022): 761. http://dx.doi.org/10.3390/jmse10060761.

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Nitrate (NO3−) dissimilatory reduction processes (denitrification, anammox and dissimilatory NO3− reduction to ammonium (DNRA)) in estuarine and coastal ecosystems play a crucial role in regulating reactive nitrogen loadings. However, nitrate reduction process rates and relative proportions along the estuarine salinity gradient remain poorly understood. Here, denitrification, anammox and DNRA were explored simultaneously along a salinity gradient in Yangtze Estuary based on nitrogen isotope-tracing experiments. Measured denitrification, anammox and DNRA process rates were in the range of 2.33–

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25

Isaacs, S., Terry Mah, and S. K. Maneshin. "Automatic monitoring of denitrification rates and capacities in activated sludge processes using fluorescence or redox potential." Water Science and Technology 37, no. 12 (1998): 121–29. http://dx.doi.org/10.2166/wst.1998.0519.

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A novel method is described to automatically estimate several key parameters affecting denitrification in activated sludge processes: the nitrate concentration, the denitrification capacity, and the maximum (substrate unlimited) and actual denitrification rates. From these, the concentration of active denitrifying microorganisms and the quality of available organic substrate pool can be estimated. Additionally, a modification of the method allows the determination of the efficacy of various carbon substrates to enhance denitrification, and this can be used to determine optimal dosing rates of

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26

Teichgräber, Burkhard, and Andreas Stein. "Nitrogen elimination from sludge treatment reject water – comparison of the steam-stripping and denitrification processes." Water Science and Technology 30, no. 6 (1994): 41–51. http://dx.doi.org/10.2166/wst.1994.0251.

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Steam stripping and nitrification/denitrification for the elimination of nitrogen from sludge treatment reject water from the Central Sludge Treatment Facilities (CSTF) of the Emschergenossenschaft in Bottrop were tested in half-scale pilot plants. More than 90% efficiency could be achieved with both systems; the nitrification/denitrification process also removed organic nitrogen. Operational experience has shown that full scale application of both systems is possible. The design surface load of the stripping column has been evaluated as 10 m3/(m2*h) and the steam/water ratio as 0.12 t/m3. The

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27

Dorias, Bernd, and Peter Baumann. "Denitrification in trickling filters." Water Science and Technology 30, no. 6 (1994): 181–84. http://dx.doi.org/10.2166/wst.1994.0267.

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National and international regulations require a minimum nitrogen removal efficiency of 70% in most public sewage treatment plants. Unlike in activated sludge plants, selective denitrification in trickling filters was not possible until now. Therefore the aim was to employ trickling filter plants for selective denitrification, using innovative technology that involved minimum capital expenditure. For selective denitrification, it is necessary to prevent as much as possible the transfer of oxygen into the trickling filter while feeding the nitrate to be removed, a process similar to upstream de

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28

Henze, Mogens, Gert Holm Kristensen, and Rune Strube. "Rate-Capacity Characterization of Wastewater for Nutrient Removal Processes." Water Science and Technology 29, no. 7 (1994): 101–7. http://dx.doi.org/10.2166/wst.1994.0318.

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The detailed composition of wastewater has significant impact on the biological wastewater treatment processes. The carbon sources present govern the oxygen uptake rate, the rate of denitrification and the biological phosphorus uptake rate. In this paper, the respiration rate determinations used for the bi- or tri-substrate determinations are coupled to removal capacity in order to develop rate-capacity diagrams, that gives a fuller picture of the wastewater and its influence on the biological processes. The directly degradable carbon source gives high reaction rates, but the concentration and

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29

Campos, José Luis, Jacques Dumais, Juan Pablo Pavissich, et al. "Predicting Accumulation of Intermediate Compounds in Nitrification and Autotrophic Denitrification Processes: A Chemical Approach." BioMed Research International 2019 (July 7, 2019): 1–9. http://dx.doi.org/10.1155/2019/2051986.

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Nitrification and sulfur-based autotrophic denitrification processes can be used to remove ammonia from wastewater in an economical way. However, under certain operational conditions, these processes accumulate intermediate compounds, such as elemental sulphur, nitrite, and nitrous oxide, that are noxious for the environment. In order to predict the generation of these compounds, an analysis based on the Gibbs free energy of the possible reactions and on the oxidative capacity of the bulk liquid was done on case study systems. Results indicate that the Gibbs free energy is not a useful paramet

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30

Baas, Peter, Jennifer D. Knoepp, and Jacqueline E. Mohan. "Well-Aerated Southern Appalachian Forest Soils Demonstrate Significant Potential for Gaseous Nitrogen Loss." Forests 10, no. 12 (2019): 1155. http://dx.doi.org/10.3390/f10121155.

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Understanding the dominant soil nitrogen (N) cycling processes in southern Appalachian forests is crucial for predicting ecosystem responses to changing N deposition and climate. The role of anaerobic nitrogen cycling processes in well-aerated soils has long been questioned, and recent N cycling research suggests it needs to be re-evaluated. We assessed gross and potential rates of soil N cycling processes, including mineralization, nitrification, denitrification, nitrifier denitrification, and dissimilatory nitrate reduction to ammonium (DNRA) in sites representing a vegetation and elevation

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31

Heffernan, J. B., A. R. Albertin, M. L. Fork, B. G. Katz, and M. J. Cohen. "Denitrification and inference of nitrogen sources in the karstic Floridan Aquifer." Biogeosciences Discussions 8, no. 5 (2011): 10247–94. http://dx.doi.org/10.5194/bgd-8-10247-2011.

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Abstract. Aquifer denitrification is among the most poorly constrained fluxes in global and regional nitrogen budgets. The few direct measurements of denitrification in groundwaters provide limited information about its spatial and temporal variability, particularly at the scale of whole aquifers. Uncertainty in estimates of denitrification may also lead to underestimates of its effect on isotopic signatures of inorganic N, and thereby confound the inference of N source from these data. In this study, our objectives are to quantify the magnitude and variability of denitrification in the Upper

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Heffernan, J. B., A. R. Albertin, M. L. Fork, B. G. Katz, and M. J. Cohen. "Denitrification and inference of nitrogen sources in the karstic Floridan Aquifer." Biogeosciences 9, no. 5 (2012): 1671–90. http://dx.doi.org/10.5194/bg-9-1671-2012.

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Abstract. Aquifer denitrification is among the most poorly constrained fluxes in global and regional nitrogen budgets. The few direct measurements of denitrification in groundwaters provide limited information about its spatial and temporal variability, particularly at the scale of whole aquifers. Uncertainty in estimates of denitrification may also lead to underestimates of its effect on isotopic signatures of inorganic N, and thereby confound the inference of N source from these data. In this study, our objectives are to quantify the magnitude and variability of denitrification in the Upper

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33

Busico, Gianluigi, Luigi Alessandrino, and Micòl Mastrocicco. "Denitrification in Intrinsic and Specific Groundwater Vulnerability Assessment: A Review." Applied Sciences 11, no. 22 (2021): 10657. http://dx.doi.org/10.3390/app112210657.

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Several groundwater vulnerability methodologies have been implemented throughout the years to face the increasing worldwide groundwater pollution, ranging from simple rating methodologies to complex numerical, statistical, and hybrid methods. Most of these methods have been used to evaluate groundwater vulnerability to nitrate, which is considered the major groundwater contaminant worldwide. Together with dilution, the degradation of nitrate via denitrification has been acknowledged as a process that can reduce reactive nitrogen mass loading rates in both deep and shallow aquifers. Thus, denit

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34

Grana, Matteo, Arianna Catenacci, and Elena Ficara. "Denitrification Capacity of Volatile Fatty Acids from Sludge Fermentation: Lab-Scale Testing and Full-Scale Assessment." Fermentation 10, no. 1 (2023): 25. http://dx.doi.org/10.3390/fermentation10010025.

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This work provides insights into the possibility of integrating recovered volatile fatty acids (VFAs) into biological nitrogen removal processes. VFAs are the main products of the acidogenic fermentation of waste sludge and are an effective carbon source for denitrification in activated sludge processes. The assessment of denitrification rates and the utilisation hierarchy of different VFAs are relevant to evaluating the possibility of replacing external carbon sources with the fermented liquid, FL, from acidogenic fermentation. To this scope, single VFAs, FL collected from a full-scale waste

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Sun, Pengfei, Jie Bai, Jie Lian, Yongyu Tan, and Xi Chen. "Single and Combined Effects of Phenanthrene and Silver Nanoparticles on Denitrification Processes in Coastal Marine Sediments." Microorganisms 12, no. 4 (2024): 745. http://dx.doi.org/10.3390/microorganisms12040745.

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The increasing production and utilization of polycyclic aromatic hydrocarbons (PAHs) and commercial silver nanoparticles (AgNPs) have raised concerns about their potential environmental release, with coastal sediments as a substantial sink. To better understanding the effects of these contaminants on denitrification processes in coastal marine sediments, a short-term exposure simulation experiment was conducted. We investigated the effects of single and combined contamination of phenanthrene (Phe) and AgNPs on denitrification processes in a coastal marine sediment. Results showed that all cont

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36

Rodziewicz, Joanna, Kamila Ostrowska, Wojciech Janczukowicz, and Artur Mielcarek. "Effectiveness of Nitrification and Denitrification Processes in Biofilters Treating Wastewater from De-Icing Airport Runways." Water 11, no. 3 (2019): 630. http://dx.doi.org/10.3390/w11030630.

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The basic factors determining the efficiency of the removal of nitrogen and carbon compounds from airport wastewater containing de-icing agents are low temperature and the C/N ratio (carbon to nitrogen ratio). Biofilm reactors (biofilters) create better conditions for nitrification and denitrification than suspended biomass reactors. The scope of the study included determination of the influence of the C/N ratio in the wastewater on nitrification, denitrification and organic compound removal in biofilm reactors depending on the temperature. The experiment was performed in 24 circular laborator

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Yang, Mengfan, Dongmei Xue, Fanqiao Meng, and Zhong-Liang Wang. "The effects of salinity on coupled nitrification and aerobic denitrification in an estuarine system." Water Science and Technology 71, no. 11 (2015): 1718–26. http://dx.doi.org/10.2166/wst.2015.159.

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Salinity has significant effects on nitrification and denitrification processes, particularly in estuarine systems. A dissolved oxygen-enriched river and its estuary in northern China were selected to investigate the impact of salinity gradients (0.6, 4, 7.6, 11.4 and 14.7‰) obtained from the mixing of river samples and estuarine samples with different proportions on coupled nitrification and aerobic denitrification via incubation experiments (35 and 10 °C). Results indicated that: (a) nitrification and coupled nitrification-aerobic denitrification occurred for all treatments, which resulted i

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Eschenbach, W., and R. Well. "Predicting the denitrification capacity of sandy aquifers from shorter-term incubation experiments and sediment properties." Biogeosciences 10, no. 2 (2013): 1013–35. http://dx.doi.org/10.5194/bg-10-1013-2013.

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Abstract. Knowledge about the spatial variability of denitrification rates and the lifetime of denitrification in nitrate-contaminated aquifers is crucial to predict the development of groundwater quality. Therefore, regression models were derived to estimate the measured cumulative denitrification of aquifer sediments after one year of incubation from initial denitrification rates and several sediment parameters, namely total sulphur, total organic carbon, extractable sulphate, extractable dissolved organic carbon, hot water soluble organic carbon and potassium permanganate labile organic car

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Eschenbach, W., and R. Well. "Predicting long-term denitrification capacity of sandy aquifers from incubation experiments and sediment properties." Biogeosciences Discussions 9, no. 7 (2012): 8807–58. http://dx.doi.org/10.5194/bgd-9-8807-2012.

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Abstract. Knowledge about the spatial variability of denitrification rates and the lifetime of denitrification in nitrate-contaminated aquifers is crucial to predict the development of groundwater quality. Therefore, regression models were derived to estimate the measured denitrification capacity of incubated aquifer sediments from initial denitrification rates and several sediment parameters, namely total sulphur, total organic carbon, extractable sulfate, extractable dissolved organic carbon, hot water soluble organic carbon and potassium permanganate labile organic carbon. For this purpose,

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Yang, Yu, Guangya Wang, Jie Wang, Xu Zuo, and Hongtao Kao. "Numerical Simulation of Selective Non-Catalytic Reduction Denitrification Process in Precalciner and the Effect of Natural Gas Injection on Denitrification." Processes 11, no. 5 (2023): 1377. http://dx.doi.org/10.3390/pr11051377.

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Cement production is the third largest source of nitrogen oxides (NOx), an air pollutant that poses a serious threat to the natural environment and human health. Reducing NOx emissions from cement production has become an urgent issue. This paper aims to explore and investigate more efficient denitrification processes to be applied in NOx reduction from precalciner. In this study, firstly, the flow field, temperature field, and component fraction in the precalciner are studied and analyzed using numerical simulation methods. Based on this, the influence of the reductant injection height and am

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Choi, Okkyoung, Se-jin Cha, Hyunjin Kim, Hyunook Kim, and Byoung-In Sang. "Dynamic Changes of Microbiome with the Utilization of Volatile Fatty Acids as Electron Donors for Denitrification." Water 13, no. 11 (2021): 1556. http://dx.doi.org/10.3390/w13111556.

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Volatile fatty acids can be used as carbon sources for denitrification and are easily supplied as by-products from the anaerobic digestion of waste materials. Nitrification and denitrification processes were carried out in a single reactor feeding volatile fatty acids as electron donors and the changes in microbial communities in the reactor were investigated. The microbial communities in the alternating aerobic and anoxic systems were different, and their structure flexibly changed within one reactor. Bacteroidetes and Firmicutes were highly distributed during denitrification, whereas Proteob

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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 (2007): 77–84. http://dx.doi.org/10.3846/16486897.2007.9636912.

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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. Nitrificat

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Liu, W., L. Yao, Z. Wang, Z. Xiong, and G. Liu. "Human land uses enhance sediment denitrification and N<sub>2</sub>O production in Yangtze lakes primarily by influencing lake water quality." Biogeosciences 12, no. 20 (2015): 6059–70. http://dx.doi.org/10.5194/bg-12-6059-2015.

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Abstract. Sediment denitrification in lakes alleviates the effects of eutrophication through the removal of nitrogen to the atmosphere as N2O and N2. However, N2O contributes notably to the greenhouse effect and global warming. Human land uses (e.g. agricultural and urban areas) strongly affect lake water quality and sediment characteristics, which, in turn, may regulate lake sediment denitrification and N2O production. In this study, we investigated sediment denitrification and N2O production and their relationships to within-lake variables and watershed land uses in 20 lakes from the Yangtze

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Liu, W., L. Yao, Z. Wang, Z. Xiong, and G. Liu. "Human land uses enhance sediment denitrification and N<sub>2</sub>O production in Yangtze lakes primarily by influencing lake water quality." Biogeosciences Discussions 12, no. 10 (2015): 7815–44. http://dx.doi.org/10.5194/bgd-12-7815-2015.

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Abstract. Sediment denitrification in lakes alleviates the effects of eutrophication through removal of nitrogen to the atmosphere as N2O and N2. However, N2O contributes notably to the greenhouse effect and global warming. Human lands uses (e.g., agricultural and urban areas) strongly affect lake water quality and sediment characteristics, which, in turn, may regulate lake sediment denitrification and N2O production. In this study, we investigated sediment denitrification and N2O production and their relationships to within-lake variables and watershed land uses in 20 lakes from the Yangtze R

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Meng, Yangyang, Zhibin He, Bing Liu, Longfei Chen, Pengfei Lin, and Weicheng Luo. "Soil Salinity and Moisture Control the Processes of Soil Nitrification and Denitrification in a Riparian Wetlands in an Extremely Arid Regions in Northwestern China." Water 12, no. 10 (2020): 2815. http://dx.doi.org/10.3390/w12102815.

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Soil nitrification and denitrification are key nitrogen (N) removal processes in riparian wetlands in extremely arid regions, but the driving factors of the two N processes in these wetlands are still unclear. We measured soil nitrification and denitrification rates and related environmental properties in a typical riparian wetland in the middle reaches of the Heihe River, northwestern China. Our results showed that rates of soil nitrification and denitrification exhibited moderate variability, ranging from 52.77 to 221.18 μg kg−1 h−1 and 91.25 to 428.26 μg kg−1 h−1, respectively. Soil salinit

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Verstraete, W., and S. Philips. "Nitrification-denitrification processes and technologies in new contexts." Environmental Pollution 102, no. 1 (1998): 717–26. http://dx.doi.org/10.1016/s0269-7491(98)80104-8.

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Flere, Joel M., and Tian C. Zhang. "Nitrate Removal with Sulfur-Limestone Autotrophic Denitrification Processes." Journal of Environmental Engineering 125, no. 8 (1999): 721–29. http://dx.doi.org/10.1061/(asce)0733-9372(1999)125:8(721).

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Puznava, N., M. Payraudeau, and D. Thornberg. "Simultaneous nitrification and denitrification in biofilters with real time aeration control." Water Science and Technology 43, no. 1 (2001): 269–76. http://dx.doi.org/10.2166/wst.2001.0057.

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The aim of this article is to present a new biological aerated filter (BAF) for nitrogen removal based on simultaneous nitrification and denitrification. Contrary to the systems which integrate both an aerated and a non-aerated zone to allow complete nitrogen removal in one compact or two different units (pre-denitrification and nitrification), this upflow BAF system is based on the principle of simultaneous nitrification and denitrification since the filter is completely aerated. The denitrification process is possible due to the diffusion effect which dominates biofilm processes. The real ti

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Somes, C. J., A. Oschlies, and A. Schmittner. "Isotopic constraints on the pre-industrial oceanic nitrogen budget." Biogeosciences Discussions 10, no. 2 (2013): 3121–75. http://dx.doi.org/10.5194/bgd-10-3121-2013.

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Abstract. The size of the bio-available (i.e. "fixed") nitrogen inventory in the ocean influences global marine productivity and the biological carbon pump. Despite its importance, the pre-industrial rates for the major source and sink terms of the oceanic fixed nitrogen budget, N2 fixation and denitrification, respectively, are not well known. However, these processes leave distinguishable imprints on the ratio of stable nitrogen isotopes, δ15N, which can therefore help to infer their patterns and rates. Here we use δ15N observations from the water column and a new database of seafloor measur

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Glock, N., J. Schönfeld, A. Eisenhauer, C. Hensen, J. Mallon, and S. Sommer. "The role of benthic foraminifera in the benthic nitrogen cycle of the Peruvian oxygen minimum zone." Biogeosciences Discussions 9, no. 12 (2012): 17775–817. http://dx.doi.org/10.5194/bgd-9-17775-2012.

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Abstract. The discovery that foraminifera are able to use nitrate instead of oxygen as energy source for their metabolism has challenged our understanding of nitrogen cycling in the ocean. It was evident before that only prokaryotes and fungi are able to denitrify. Rate estimates of foraminiferal denitrification were very sparse on a regional scale. Here, we present estimates of benthic foraminiferal denitrification rates from six stations at intermediate water depths in and below the Peruvian oxygen minimum zone (OMZ). Foraminiferal denitrification rates were calculated from abundance and ass

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