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Dissertations / Theses on the topic 'Nitrifying'

Author: Grafiati

Published: 4 June 2021

Last updated: 28 January 2023

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1

Encarnacion, Gem Deangkinay. "Microbial ecology of nitrifying simulated premises plumbing." Diss., Montana State University, 2012. http://etd.lib.montana.edu/etd/2012/encarnacion/EncarnacionG0512.pdf.

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Because of the Stage 2 Disinfectants and Disinfection Rule limiting then concentration of disinfection by products in drinking water, the use of chloramine as an alternative to chlorine has been increasing. However, the ammonia introduced by chloramination can lead to nitrification which results in the production of nitrite and nitrate, leading to regulatory violations. Nitrification in reactors with copper and polyvinyl chloride (PVC) surfaces was established by indigenous organisms from Bozeman tap water and has been stably maintained for more than 6 years. Statistical analyses of polymerase

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2

McKinlay, Sarah M. "The interactions between ammonifying and nitrifying bacteria." Thesis, University of Aberdeen, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.338396.

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The effects of adhesion to surfaces on the specific growth rates of <I>Nitrosomonas europaea </I>and <I>Nitrobacter </I>sp. were determined in batch culture systems both in monoculture and co-culture. It was found that the presence of a glass slide in co-cultures of these bacteria significantly reduced the specific growth rates of both species of bacteria. In monoculture, the specific growth rate of <I>N. europaea </I>was significantly lower in a mature biofilm system. The specific rates of production of ammonia by these four species of <I>Pseudomonas </I>were investigated in minimal medium. A

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3

Schopf, Alexander Gerald. "Advancement of Nitrifying Wastewater Treatment Design and Operation." Thesis, Université d'Ottawa / University of Ottawa, 2021. http://hdl.handle.net/10393/41961.

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There is an urgent need to develop ammonia removal treatment systems for municipal and industrial wastewater treatment due to the increasingly stringent ammonia effluent discharge regulations implemented by Canada, the United States, and the European Union. The objective of this dissertation is to develop new understanding and advance the current design and operation of total ammonia nitrogen (TAN) removal via the moving bed biofilm reactor technology (MBBR) for municipal and industrial wastewaters. The first specific objective is to develop a passive, low operationally intensive, efficient an

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4

Cheatham, Amy Kathleen. "Responses of Nitrifying Bacteria to Aquaculture Chemotherapeutic Agents." Diss., Virginia Tech, 2009. http://hdl.handle.net/10919/26879.

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As in any animal production industry, disease is inevitable; therefore, it is imperative that aquaculturists are able to effectively manage the disease and maintain their high production levels in an effort to bridge the gap between supply and demand in the seafood industry that has been caused in part by global over-fishing. This management responsibility lies not only in understanding the impact of the treatment on the cultured species, but also in understanding the impact of the treatment to the aquaculture system as an ecosystem. Currently, there is a narrow variety of chemicals approved b

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5

Forrest, Daina. "Tertiary Nitrifying Moving Bed-Biofilm Reactor: A Study of Carrier and Loading Effects on Nitrifying Kinetics, Biologically Produced Solids and Microbial Community." Thesis, Université d'Ottawa / University of Ottawa, 2014. http://hdl.handle.net/10393/31425.

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There is an increasing need for tertiary level wastewater treatment in Canada, driven in some cases by both provincial and federal regulation (Canada Gazette, 2012). Tertiary nitrification is the biologically mediated oxidation of nitrogen in the form of ammonia to nitrate following secondary treatment of carbonaceous material (Barnes & Bliss, 1983). The application of tertiary nitrification can prove challenging in the Canadian climate because of the temperature sensitive nature of nitrifiers (Hwang & Oleszkiewicz, 2007). Hence the greater than 1000 lagoon treatment plants currently in operat

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6

Song, Weining. "Some aspects of the utilization of inorganic nitrogen compounds and carbon compounds by "Nitrobacter hamburgensis" /." Title page, contents and summary only, 1987. http://web4.library.adelaide.edu.au/theses/09A/09as724.pdf.

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7

Ren, Baisha. "Understanding Extracellular Polymeric Substances in Nitrifying Moving Bed Biofilm Reactor." Thesis, Université d'Ottawa / University of Ottawa, 2015. http://hdl.handle.net/10393/32879.

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Water and wastewater treatment solutions incorporating biofilm systems are becoming increasingly popular due to more stringent regulations pertaining to drinking water and wastewater effluent discharge in Canada and in other parts of the world. As a major component of biofilm, extracellular polymeric substances (EPS) have been considered as an important factor affecting the physical and chemical properties of biofilm. Further, the selected method of EPS extraction and the methods of detecting the composition of the EPS have shown to affect the results of EPS measurements. In this research, pr

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8

Delatolla, Robert. "Nitrifying biofilms at cold temperatures: kinetics and in-situ characterization." Thesis, McGill University, 2009. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=32550.

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The biological process of nitrification is currently the most economical and commonly employed means of removing ammonia from wastewater. Although nitrification is cost-effective and has been used in many treatment facilities in North America, the temperature sensitivity of suspended growth nitrifying bacteria is of considerable concern when designing wastewater treatment facilities in many North American cities. Notwithstanding the limited ability of suspended growth treatment systems to achieve nitrific

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9

Song, June S. "Effect of copper on nitrifying and heterotrophic populations in activated sludge." Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file., 142 p, 2005. http://proquest.umi.com/pqdweb?did=954050351&sid=7&Fmt=2&clientId=8331&RQT=309&VName=PQD.

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10

Smith, Timothy R. "Evaluating the effectiveness of commercial nitrifying bacteria in a constructed wetland." Virtual Press, 1996. http://liblink.bsu.edu/uhtbin/catkey/1020149.

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This research was conducted to determine the effects of commercially available nitrifying bacteria in a constructed wetland. The study was conducted at Paws, Inc., near Desoto, Indiana during the summer of 1995. The wetland, called Solar Aquatics Treatment System (SAS), was developed by Ecological Engineering Associates and constructed in a, greenhouse. The commercial nitrifying bacteria (Bacta-Pur), contained Nitrosomonas and Nitrobacter Spp. and have been added to the wetland for the past five years to aid in the removal of nitrogen.Water samples were taken from the wetland and analyzed for

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11

Song, June Sup. "Effect of copper on nitrifying and heterotrophic populations in activated sludge." Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file, 142 p, 2005. http://proquest.umi.com/pqdweb?did=954050351&sid=7&Fmt=2&clientId=8331&RQT=309&VName=PQD.

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12

Lako, Joseph. "Analysis of ammonia-oxidizing bacteria associated with the roots of Proteaceae plant species in soils of Fynbos ecosystem." Thesis, University of the Western Cape, 2005. http://etd.uwc.ac.za/index.php?module=etd&amp.

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The major objective of this study was to investigate soil ammonia-oxidizing bacterial diversity and composition associated with plant roots of Proteaceae plants and to compare it with non-plant associated soil.

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13

Montràs, Boet Anna. "Mathematical modelling and molecular analysis of a nitrifying packed bed biofilm reactor." Doctoral thesis, Universitat Autònoma de Barcelona, 2009. http://hdl.handle.net/10803/5327.

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MELiSSA (Micro Ecological Life Support System Alternative) és el sistema desenvolupat per l'Agència Espacial Europea (ESA) i el consorci MELiSSA en el camp del suport de vida durant missions de llarga durada a l'espai. Basat en un ecosistema aquàtic, MELiSSA va ser concebut com una eina per desenvolupar la tecnologia necessària per a un sistema de suport de vida biològic que en un futur ha de permetre la producció d'aliment, aigua i oxigen a partir dels residus orgànics generats per una tripulació. <br/>Per assolir aquest objectiu, el concepte MELiSSA compta amb l'activitat combinada de cinc c

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14

Fouratt, Melissa Amanda. "Application of Molecular Techniques to the Characterization of a Nitrifying Bioaugmentation Culture." Thesis, Virginia Tech, 2001. http://hdl.handle.net/10919/33171.

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Nitrification is the biological process whereby ammonia is converted first to nitrite by ammonia-oxidizing bacteria, and then the nitrite is subsequently converted to nitrate by nitrite-oxidizing bacteria. Ammonia and nitrite levels are closely monitored during treatment of wastewater due to their toxicity to other biological processes. Sybron Chemicals, Inc., is a company that manufactures a nitrifying bioaugmentation culture (1010N) that is used to enhance the naturally occurring levels of biological nitrification. The microbial population of the 1010N product has been examined using a c

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15

Ray, Anirban. "Identification, Enumeration and Diversity of Nitrifying Bacteria in the Laurentian Great Lakes." Bowling Green State University / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1351276518.

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16

Mofokeng, Teboho. "Full-scale trials of external nitrification on plastic media nitrifying trickling filter." Master's thesis, University of Cape Town, 2008. http://hdl.handle.net/11427/5024.

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Includes abstract.<br>Includes bibliographical references.<br>In South Africa, many wastewater treatment plants (WWTP) still make us of their rock filled trickling filters. Instead of using them for organics removal and nitrification, there is growing interest in integrating them with biological excess P removal activated sludge (BEPRAS) systems in an external nitrification flow scheme (Hu et al., 2000). In such a scheme, the full influent flow (after primary settling) is discharged to the anaerobic reactor of the BEPRAS system, after which the activated sludge is separated from the water by i

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17

Jones, Nicole Jean. "NITRIFYING BACTERIAL ABUNDANCE IN RELATION TO NITROGEN AND PHOSPHORUS COMPOUNDS IN WETLANDS." OpenSIUC, 2012. https://opensiuc.lib.siu.edu/theses/829.

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Floodplain lakes are wetlands which receive flood waters from nearby rivers or other sources. Water samples were taken from floodplain lakes near the Illinois River, the Mississippi River, and the Cache River in Southern Illinois. Fluorescence in situ hybridization (FISH), spectrophotometry, and gene probes were used to investigate the effect of nutrient and chemical concentrations on the abundance of nitrifying bacteria; specifically ammonia-oxidizing Nitrosococcus and Nitrosomonadales and nitrite-oxidizing Nitrospira and Nitrobacter. Nitrosococcus was the dominant ammonia-oxidizing bacteria

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18

Young, Bradley. "Nitrifying MBBR Performance Optimization in Temperate Climates Through Understanding Biofilm Morphology and Microbiome." Thesis, Université d'Ottawa / University of Ottawa, 2017. http://hdl.handle.net/10393/36001.

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Nitrification is currently the most common means of ammonia removal from wastewaters in temperate climates. In conventional suspended growth systems operating in northern climate regions, nitrification completely ceases at temperatures below 8°C. This is a considerable concern in passive treatment systems where wastewater temperatures can reach as low as 1°C for extended periods in the winter months. There is evidence biofilm technologies have the ability to nitrify at low temperatures, however, the literature is missing an understanding of low temperature nitrification and the subsequent impa

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19

Meng, Yiyu. "Nitrite oxidising bacteria in soil : examination of the interactions with ammonia oxidisers and the influence of pH on their diversity and distribution." Thesis, University of Aberdeen, 2016. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?pid=231853.

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Nitrification is a central part of the nitrogen cycle, whereby the most reduced form, ammonia, is converted to the most oxidised form, nitrate via nitrite. The first step is performed by ammonia oxidising bacteria (AOB) and archaea (AOA), with the second step performed by nitrite oxidising bacteria (NOB). Although both groups are closely associated in nature, ammonia oxidisers have received more attention compared to NOB as ammonia oxidation is considered the rate-limiting step. Nitrobacter and Nitrospira are two important groups of soil NOB. To determine whether there are specific association

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20

Zaklikowski, Anna Emilia. "The Effect of Chlorine and Chloramines on the Viability and Activity of Nitrifying Bacteria." Thesis, Virginia Tech, 2006. http://hdl.handle.net/10919/33758.

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<p> Nitrification is a significant concern for drinking water systems employing chloramines for secondary disinfection. Utilities have implemented a range of disinfection strategies that have varying levels of effectiveness in the prevention and control of nitrification events, including optimizing the chlorine-to-ammonia ratio, maintaining chloramine residual throughout the distribution system, controlling pH, and temporal switching to free chlorination. Annual or semi-annual application of free chlorination is practiced by 23% of chloraminating systems on a temporary basis as a preventativ

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21

Morris, Michael. "Studies in the behaviour of a nitrifying verical flow constructed wetland wastewater treatment system." Thesis, University of Worcester, 1999. http://eprints.worc.ac.uk/750/.

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A novel configuration of vertical downflow constructed wetland was used to treat up to 75 m3 per day of sugar beet processing wastewaters. The 403 m2, two-stage pilot system included planted and unplanted cells of a variety of sand depths (0.15 - 0.4 m) and sand particle size distributions (d10 = 0.07 - 1.2 mm). The hydraulic regime of each bed was also manipulated. Typical beet processing wastewaters contained 235 mg BOD l-1, 45 mg NH4-N l-1, 0.03 mg PO4-P l-1, 16 mg TSS l-1, at pH 8.2 and 29 °C. Overall performance of the pilot system, with respect to BOD, NH4-N, and TSS removal, was similar

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22

Li, Chunju. "Dynamic variations of carbonaceous and nitrifying activities in hybrid reactors with different operating conditions /." View abstract or full-text, 2004. http://library.ust.hk/cgi/db/thesis.pl?CIVL%202004%20LI.

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Thesis (Ph. D.)--Hong Kong University of Science and Technology, 2004.<br>Includes bibliographical references (leaves 178-188). Also available in electronic version. Access restricted to campus users.

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23

Hughes, Leonie. "Multistage and multiple biomass approaches to efficient biological nitrogen removal using biofilm cultures." Thesis, Hughes, Leonie ORCID: 0000-0001-6496-988X (2008) Multistage and multiple biomass approaches to efficient biological nitrogen removal using biofilm cultures. PhD thesis, Murdoch University, 2008. https://researchrepository.murdoch.edu.au/id/eprint/674/.

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Nitrogen removal from wastewater is important for the revention of significant health and environmental impacts such as eutrophication. Nitrogen removal is achieved by the combined action of nitrification and denitrification. Nitrification is performed by autotrophic, slow growing microorganisms that require oxygen and are inhibited in the presence of denitrifiers when oxygen and COD are available due to competition for oxygen. Denitrification however, performed by relatively fast growing heterotrophic bacteria, is inhibited by oxygen and requires COD. This implies that nitrification and denit

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Hughes, Leonie. "Multistage and multiple biomass approaches to efficient biological nitrogen removal using biofilm cultures." Hughes, Leonie (2008) Multistage and multiple biomass approaches to efficient biological nitrogen removal using biofilm cultures. PhD thesis, Murdoch University, 2008. http://researchrepository.murdoch.edu.au/674/.

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Nitrogen removal from wastewater is important for the revention of significant health and environmental impacts such as eutrophication. Nitrogen removal is achieved by the combined action of nitrification and denitrification. Nitrification is performed by autotrophic, slow growing microorganisms that require oxygen and are inhibited in the presence of denitrifiers when oxygen and COD are available due to competition for oxygen. Denitrification however, performed by relatively fast growing heterotrophic bacteria, is inhibited by oxygen and requires COD. This implies that nitrification and denit

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25

Hjorth, Ingrid. "Molecular genetic analysis of the microbial community structure in nitrifying biofilms adapted to different salinities." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for bioteknologi, 2010. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-14053.

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Nitrification, the microbial oxidation of ammonia to nitrate, is a key step inthe biological cycling of nitrogen, and is often used in wastewater treatmentfor removal of ammonium. Fish-farming in flow-through systems such asopen net pens is the largest contributor to human discharge of inorganicnutrients along the Norwegian coast. It is important to limit these emissionsby converting to recirculating systems for nitrogen removal. However, thenitrification process is known to be sensitive to high concentrations of salts,a factor of importance when establishing technology for treatment of saline

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Bäckman, Jenny. "Nitrification and nitrifying bacterial communities in coniferous forest soils : effects of liming and clear-cutting /." Linköping : Univ, 2003. http://www.bibl.liu.se/liupubl/disp/disp2002/tek809s.pdf.

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27

Yang, Jeongwoo. "Fate and effect of alkyl benzyl dimethyl ammonium chloride in mixed aerobic and nitrifying cultures." Thesis, Atlanta, Ga. : Georgia Institute of Technology, 2007. http://hdl.handle.net/1853/19871.

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Thesis (M. S.)--Civil and Environmental Engineering, Georgia Institute of Technology, 2008.<br>Committee Chair: Spyros G. Pavlostathis; Committee Member: Ching-Hua Huang; Committee Member: John A. Pierson.

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28

Azimi, A. A. "The effects of reactor configuration on the performance of nitrifying activated sludges under transient loadings." Thesis, University of Leeds, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.233194.

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29

Daims, Holger. "Population structure and functional analyses by in situ techniques of nitrifying bacteria in wastewater treatment plants." [S.l. : s.n.], 2001. http://deposit.ddb.de/cgi-bin/dokserv?idn=963771582.

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30

Morris, Raymond Anthony. "Investigation of the Optimal Dissolved CO2 Concentration and pH Combination for the Growth of Nitrifying Bacteria." Scholar Commons, 2011. http://scholarcommons.usf.edu/etd/3256.

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Ammonium (NH4+) is a biological nutrient that is transformed in a wastewater treatment plant (WWTP) in a process called activated sludge. This is accomplished in an aerobic environment using microorganisms and inorganic carbon that convert the ammonium to nitrate (NO3-). This process is termed nitrification. Removal of ammonium is necessary due to its oxygen demand and toxicity to the environment. Nitrification is considered a slow process due to the slow growth rate of the nitrifying bacteria. Ammonia oxidizing bacteria (AOB) first covert the ammonium (NH4+) to nitrite (NO2-) followed by

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Repke, Rodrigo Alberto 1988. "Efeito de diferentes concentrações e estirpes da bactéria Azospirillum brasilense nos componentes de produção em plantas de trigo /." Botucatu, 2016. http://hdl.handle.net/11449/144493.

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Orientador: Silvio José Bicudo<br>Coorientador: Rogério Peres Soratto<br>Banca: Marcio Christian S. Domingues<br>Banca: Priscila Gonzales Figueiredo<br>Banca: Carlos Jorge da Silva<br>Banca: Luciano Soares de Souza<br>Resumo: O triticum aestivum é uma espécie de ciclo anual, pertencente à família Poaceae. Cultivado em regiões de climas subtropical e temperado, ocupa a segunda maior área plantada no mundo. Para obtenção de altas produtividade dentre outros cuidados, é essencial o fornecimento de nutrientes na quantidade demandada pelas cultivares de alto potencial produtivo, com destaque para o

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Moore, J. Michael. "Nitrification inhibition by metalaxyl as influenced by pH, temperature, and moisture content in three soils." Diss., Virginia Polytechnic Institute and State University, 1989. http://hdl.handle.net/10919/54249.

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Metalaxyl, [N—(2,6-Dimethylphenyl)-N-(Methoxyacetyl)-alanine methyl ester], is used extensively in tobacco (Nicotiana tabacum L.) production for prevention of black shank (Phytophthora parasitica Dast. var. nicotianae), blue mold (Peronospora tabacina Adam), and damping-off (Pythigm spp.). Metalaxyl is also patented as a nitrification inhibitor, although not marketed for that purpose. Proper maturity and ripening of flue-cured tobacco depends on an adequate supply of N through the time of removal of the inflorescence, with a declining supply of N from that point. Use of a chemical which might

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Ruiz, Rueda Olaya. "Nitrifying and denitrifying bacterial communities in the sediment and rhizosphere of a free water surface constructed wetland." Doctoral thesis, Universitat de Girona, 2008. http://hdl.handle.net/10803/7871.

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La contínua descàrrega de nutrients, sobretot fosfats i nitrogen, és la major causa d'eutrofització dels ecosistemes aquàtics. Els sistemes de tractament basats en aiguamolls construïts s'han emprat per reduir ells nivells de nitrogen a l'aigua com a alternativa de baix cost als mètodes de depuració convencionals. L'eliminació del nitrogen a aquests sistemes depèn en bona part de la vegetació, i l'alternança de condicions aeròbiques i anaeròbiques per promoure els processos de nitrificació i desnitrificació. En aquest treball hem volgut investigar les activitats microbianes de nitrificació i

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Hoang, Phuong Ha, Hong Thu Nguyen, Trung Thanh Trung, Thanh Tung Tran, Lan Phuong Do, and Thi Nhi Cong Le. "Isolation and selection of nitrifying bacteria with high biofilm formation for treatment of ammonium polluted aquaculture water." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2017. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-227866.

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A biofilm is any group of microorganisms in which cells stick to each other and adhere to a surface by excreting a matrix of extracellular polymeric substances (EPS). The chemoautotrophic nitrifying bacteria hardly form biofilms due to their extremely low growth rate; however, biofilm formation of nitrifying bacteria trends to attach in carrier by extracellular polysaccharides that facilitate mutual adhesion, the forming biofilm is also beneficial in nitrogen removal in biological filter systems, especially in aquaculture water treatment systems. The microbial activity within bio-carrier is a

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Shishido, Masahiro 1960. "Effectiveness of dominant Rhizobium meliloti indigenous to Arizona soil." Thesis, The University of Arizona, 1988. http://hdl.handle.net/10150/276929.

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A total of 200 Rhizobium meliloti isolates were sampled from alfalfa (Medicago sativa L.) nodules in five uninoculated fields throughout Arizona. Dominant strains (≥ 20% nodule occupancy at each site) were identified using plasmid profile analysis and intrinsic antibiotic resistance patterns. The major dominant strains and a commercial strain (102F77b) were evaluated for their N fixing effectiveness in a Leonard jar study. All strains were highly effective, and no significant differences were found (p ≥ 0.05) in shoot weight, root weight, nodule weight, acetylene reduction and total N content

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Ahmed, Warsama. "Nitrifying Moving Bed Biofilm Reactors at Low Temperatures and Cold Shock Conditions: A Kinetic, Biofilm and Microbiome Study." Thesis, Université d'Ottawa / University of Ottawa, 2020. http://hdl.handle.net/10393/41196.

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The nitrification process, the biologically mediated process of ammonia treatment in water resources recovery facilities (WRRF), remains the most common treatment process to mitigate the adverse effects of effluent ammonia discharges in surface water. However, it is well established that the temperature-sensitive process of nitrification remains hindered at low temperatures in conventional suspended growth technologies; specifically, passive treatment systems such as the lagoons, representing over 50% of Canadian treatment facilities in operation. As such, nitrification in lagoon facilities re

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Correa, Camila Zoe. "Reator de leito estruturado com recirculação submetido à aeração intermitente no tratamento de esgoto sanitário." Universidade Tecnológica Federal do Paraná, 2015. http://repositorio.utfpr.edu.br/jspui/handle/1/1680.

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O lançamento de compostos nitrogenados em corpos d’água pode resultar em problemas ambientais, sendo assim tratar águas residuárias, como o esgoto sanitário com o objetivo de remover não apenas matéria orgânica, mas tambémnitrogênio tem sido objeto de estudo há algumas décadas. O objetivo deste trabalho foi avaliar o desempenho de um reator de leito estruturado e fluxo contínuo, com recirculação, na remoção de matéria orgânica e nitrogênio presente em esgoto sanitário, sob diferentes ciclos de Aeração intermitente (AI) e avaliar a influência destes ciclos no desenvolvimento de bactérias nitrif

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Keuter, Sabine [Verfasser], and Eva [Akademischer Betreuer] Spieck. "Characterization of nitrifying bacteria in marine recirculation aquaculture systems with regard to process optimization / Sabine Keuter. Betreuer: Eva Spieck." Hamburg : Staats- und Universitätsbibliothek Hamburg, 2012. http://d-nb.info/1022196472/34.

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Smith, Robert C. "Ecological Factors in Design of a Two-Sludge Nitrifying Activated Sludge System Incorporating Side-Stream Treatment of Anaerobic Digester Supernatant." University of Cincinnati / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1291307830.

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Hüpeden, Jennifer [Verfasser], and Eva [Akademischer Betreuer] Spieck. "Taxonomic and functional diversity of nitrifying biofilm communities in biofilters of different recirculating aquaculture systems / Jennifer Hüpeden ; Betreuer: Eva Spieck." Hamburg : Staats- und Universitätsbibliothek Hamburg, 2020. http://d-nb.info/1209676087/34.

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Posso-Blandon, Lina. "Stimulation of nitrification by carbon dioxide in lab-scale activated sludge reactors." [Tampa, Fla.] : University of South Florida, 2005. http://purl.fcla.edu/fcla/etd/SFE0001285.

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Cao, Huiluo, and 曹慧荦. "Molecular ecology of ammonia oxidizing archaea and bacteria." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2011. http://hub.hku.hk/bib/B47155358.

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The newly recognized ammonia-oxidizing archaea (AOA) makes re-evaluation of the contribution to ammonia oxidization by both AOA and ammonia-oxidizing bacteria (AOB) necessary and meaningful. The growing population and increasing anthropogenic activities around coastlines have affected wetland and coastal marine ecosystems through discharging polluted water containing large amounts of reactive inorganic nitrogen. The objectives of this study were to detect the phylogenetic diversity and abundance of ammonia oxidizers including AOA and AOB on different scales and to elucidate the distribution p

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Zhan, Weixi. "The fate of dosed copper to inhibit nitrification in chloraminated water distribution system." Thesis, Curtin University, 2007. http://hdl.handle.net/20.500.11937/1359.

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Chloramine as a secondary disinfectant has been widely used by many water utilities around the world especially in a distribution system requiring a longer retention time such as the 600km long Goldfield water distribution system of Western Australia. Chloramine is selected mainly due to its better stability and low by-products over other disinfectants. However, it is reported that under nitrifying conditions, chloramine residual could drop dramatically. Consequently the required disinfectant concentration can not be maintained. Nitrification, microbial process, is known to be causing rapid de

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Huang, Ying-Sheng. "Evidence for Multiple Functions of a Medicago Truncatula Transporter." Thesis, University of North Texas, 2014. https://digital.library.unt.edu/ark:/67531/metadc699903/.

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Legumes play an important role in agriculture as major food sources for humans and as feed for animals. Bioavailable nitrogen is a limiting nutrient for crop growth. Legumes are important because they can form a symbiotic relationship with soil bacteria called rhizobia that results in nitrogen-fixing root nodules. In this symbiosis, rhizobia provide nitrogen to the legumes and the legumes provide carbon sources to the rhizobia. The Medicago truncatula NPF1.7/NIP/LATD gene is essential for root nodule development and also for proper development of root architecture. Work in our lab on the MtNPF

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Pelivanoski, Bojan [Verfasser], and Martin [Akademischer Betreuer] Denecke. "Elucidating the potential of anaerobic wastewater treatment for nitrogen removal with nitrifying airlift reactor and lithotrophically denitrifying FeS granules / Bojan Pelivanoski ; Betreuer: Martin Denecke." Duisburg, 2021. http://d-nb.info/1232175870/34.

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Scudeletti, Daniele 1990. "Modos de inoculação de azospirillum brasilense em cana-de-açúcar /." Botucatu, 2016. http://hdl.handle.net/11449/146731.

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Orientador: Carlos Alexandre Costa Crusciol<br>Coorientador: Marcelo de Almeida Silva<br>Banca: Gabriela Ferraz Siqueira<br>Banca: Eduardo Negrisoli<br>Resumo: A cana-de-açúcar (Saccharum spp.) é uma cultura de grande importância econômica para o Brasil, pois além de gerar empregos em setores como agrícola, industriais e terceiros, a cultura também proporciona a produção de biomassa energética. Há muitas evidências de que esta cultura seja beneficiada pela interação com bactérias diazotróficas, principalmente as do gênero Azospirillum que, além da fixação de N atmosférico podem produzir fitorm

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Chauret, Christian. "Effect of tungsten on nitrate and nitrite reductases in Azospirillum brasilense SP 7." Thesis, McGill University, 1990. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=59635.

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Azospirillum brasilense reduced nitrate in W-containing Mo-limited medium, but at lower rates than in W-free medium. However nitrate reduction by Paracoccus denitrificans was completely suppressed under the same conditions. Nitrite reductase activity of growing A. brasilense was negatively affected by tungstate. Nitrite accumulation was shown to be the result of an inhibitory effect of nitrate on nitrite reductase activity. Both resting whole cell and cell-free extract preformed nitrite reductase activities were equally affected by increasing levels of tungstate. Preformed nitrate reductase ac

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Lee, Woo Hyoung. "Development and Use of Microelectrodes to Evaluate Nitrification within Chloraminated Drinking Water System Biofilms, and the Effects of Phosphate as a Corrosion Inhibitor on Nitrifying Biofilm." University of Cincinnati / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1258489526.

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Oliveira, Karina Vogel Vidal de. "Caracterização de comunidade microbiana em biofilme associada a filtro biológico para o tratamento de efluente de aquacultura." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2010. http://hdl.handle.net/10183/26913.

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Na aquacultura de recirculação são utilizados filtros biológicos para o tratamento do efluente antes que este retorne aos tanques. Estas unidades de tratamento têm como finalidade a transformação de nitrogênio amoniacal em nitrato, pois a amônia e o nitrito são tóxicos para os peixes. O nitrogênio amoniacal tende a se acumular na água de cultivo, pois é um importante produto de excreção dos organismos aquáticos e degradação da ração não consumida. Nestes filtros biológicos, os microorganismos responsáveis pelo tratamento da água residuária se encontram aderidos no meio de preenchimento, forman

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Miller, Jerry Lee 1960. "Desorption and biodegradation experiments: 1) Effect of application solvents on nitrifying bacteria, 2) Effect of surfactants on release and biodegradation of strongly bound soil residues of atrazine and naphthalene." Diss., The University of Arizona, 1997. http://hdl.handle.net/10150/565576.

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