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Dissertations / Theses on the topic 'Nitrogen oxides Environmental aspects'

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Published: 4 June 2021

Last updated: 2 February 2022

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1

Ahmed, Sauda. "Modeling of Ultrafine Particle Emissions and Ambient Levels for the Near Roadside Environment." PDXScholar, 2017. https://pdxscholar.library.pdx.edu/open_access_etds/3506.

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Various epidemiological studies have linked exposure to Ultrafine Particles (UFP; diameter< 100 nm) to adverse health impacts. Roadway traffic is one of the major sources of UFPs and heavily influences UFP concentrations in the nearby vicinity of major roadways. Modeling efforts to predict UFPs have been limited due to the scarcity of reliable information on emissions, lack of monitoring data and limited understanding of complex processes affecting UFP concentrations near sources. In this study continuous measurement of ultrafine particle number concentrations (PNC) and mass concentrations of

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2

Nordin, Anders. "On the chemistry of combustion and gasification of biomass fuels, peat and waste : environmental aspects." Doctoral thesis, Umeå universitet, Kemiska institutionen, 1993. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-110672.

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3

Crawford, Ian Stewart. "Catalytic reduction of nitric oxide by carbon monoxide or hydrogen over a Monel metal catalyst." Title page, contents and summary only, 1987. http://web4.library.adelaide.edu.au/theses/09EN/09enc899.pdf.

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4

Thornton, Matthew Jaeger. "Modal vehicle activity on freeways and freeway onramps : an assessment of the oxides of nitrogen emissions impacts resulting from changes in vehicle operating mode due to ramp metering systems." Diss., Georgia Institute of Technology, 2000. http://hdl.handle.net/1853/20785.

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5

Lim, Guo Quan. "Evaluation of the Influence of Non-Conventional Sources of Emissions on Ambient Air Pollutant Concentrations in North Texas." Thesis, University of North Texas, 2015. https://digital.library.unt.edu/ark:/67531/metadc804841/.

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Emissions of air pollutants from non-conventional sources have been on the rise in the North Texas area over the past decade. These include primary pollutants such as volatile organic compound (VOC) and oxides of nitrogen (NOx) which also act as precursors in the formation of ozone. Most of these have been attributed to a significant increase in oil and gas production activities since 2000 within the Barnett Shale region adjacent to the Dallas-Fort Worth metroplex region. In this study, air quality concentrations measured at the Denton Airport and Dallas Hinton monitoring sites operated by t

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6

Shihady, Steven. "TREATMENT OF NITROGEN OXIDES BY CHLORELLA VULGARIS ALGAE IN PHOTOBIOREACTORS." DigitalCommons@CalPoly, 2014. https://digitalcommons.calpoly.edu/theses/1284.

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The effectiveness of algae to treat NO2and NO in simulated flue gas was tested using Chlorella vulgaris in photobioreactors (PBRs) using NOxconcentrations between 30 ppm to 780 ppm. NOxdissolved and reacted in water to form NO3-and NO2-in the PBR growth medium, providing a nitrogen source that the algae readily assimilated for cell synthesis. Three 20-L photobioreactors were inoculated with a pure culture of C. vulgaris prepared in Bristol growth medium and algae were grown in the PBRs at 25°C and pH of 7.0 in a modified Bristol medium that did not contain nitrogen compounds. The C. vulgaris g

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7

Walecka-Hutchison, Claudia. "Nitrogen dynamics in diesel biodegradation : effects of water potential, soil C:N ratios, and nitrogen cycling on biodegradation efficacy." Diss., The University of Arizona, 2005. http://hdl.handle.net/10150/191274.

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Respirometric experiments were performed to evaluate the role of nitrogen in aerobic diesel biodegradation. Specific objectives included 1) evaluating the effects of water potential induced by various nitrogen amendments on diesel biodegradation rates in arid region soils, 2) comparing concurrent effects of C:N ratios and soil water potential on diesel degradation rates, and 3), measuring gross rates of nitrogen cycling processes in diesel-contaminated soil to determine duration of fertilizer bioavailability. In all studies, increasing nitrogen fertilization resulted in a decrease in total wat

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8

Samoylov, Alexander V. "Improvement of the efficiency of vehicle inspection and maintenance programs through incorporation of vehicle remote sensing data and vehicle characteristics." Diss., Georgia Institute of Technology, 2013. http://hdl.handle.net/1853/50410.

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Emissions from light-duty passenger vehicles represent a significant portion of total criteria pollutant emissions in the United States. Since the 1970s, emissions testing of these vehicles has been required in many major metropolitan areas, including Atlanta, GA, that were designated to be in non-attainment for one or more of the National Ambient Air Quality Standards. While emissions inspections have successfully reduced emissions by identifying and repairing high emitting vehicles, they have been increasingly inefficient as emissions control systems have become more durable and fewer vehicl

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9

Cochlan, William Patrick. "Nitrogen uptake by marine phytoplankton : the effects of irradiance, nitrogen supply and diel periodicity." Thesis, University of British Columbia, 1989. http://hdl.handle.net/2429/30628.

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Diel patterns of nitrogen (NO₃⁻, NH₄⁺, urea) uptake were investigated in natural assemblages of phytoplankton from neritic and oceanic environments off the coast of British Columbia. This is the first study to report nitrogen uptake rates and extensive measurements of ambient NH₄⁺ and urea concentrations in these waters. Calculated rates of N uptake, 15 based on ¹⁵N incorporation into particulate matter during time course experiments, were maximal during the day and minimal at night. Besides the obvious effects of irradiance, the amplitude of the periodicity in uptake rate was influenced

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10

Hengnirun, Somgiat. "A computer simulation model for manurial nitrogen management : environmental aspects (MANIMEA)." Thesis, McGill University, 1996. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=40357.

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The MANIMEA $ rm ( underline{MA}nurial underline{NI}trogen underline{M}anagement{:} underline{E}nvironmental underline{A}spects)$ model is a one-dimensional dynamic model that simultaneously simulates nitrogen transformations (volatilization, net mineralization-immobilization, and denitrification), nitrogen transport (runoff and leaching), plant uptake, and adsorption in homogeneous, unsaturated soils. The simulated system is divided into two components: the applied manure layer and the soil. The model describes the transformation processes occurring in both components separately. It is also c

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11

Bose, Arun Chand. "Pulverized coal combustion: Fuel nitrogen mechanisms in the rich post-flame." Diss., The University of Arizona, 1989. http://hdl.handle.net/10150/184635.

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Chemical kinetic mechanisms governing the fate of coal nitrogen in the fuel-rich stage of a pulverized-coal staged combustion process were investigated. Emphasis was on determination of the effects of coal rank, temperature and stoichiometric ratios on the speciation and rates of destruction of nitrogenous species and correlation of coal data by a unif1ed mechanism. The relative importance of homogeneous and heterogeneous mechanisms during post-flame interconversion reactions of the fuel nitrogen pool was quantified. Experiments with doped propane gas and a high- and low-grade coals, burned un

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12

Anand, Archana. "The nitrogen isotope fingerprint of wastewater effluents in Hong Kong." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2014. http://hdl.handle.net/10722/207619.

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Nitrogen pollution in marine waters is directly tied to human development – including agricultural runoff, atmospheric deposition, and urban wastewater effluents. After more than a century of urbanization, Hong Kong faces a major challenge in mitigating marine pollution, particularly nitrogen. Indeed, nitrogen pollution may be one of the primary causes of benthic ecosystem decline as evidenced by a contraction in the historical distribution of corals and seagrasses. Such ecosystems provide vital ecosystem services, not limited to nursery grounds for economically important fisheries. While the

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13

Goldman, Jeffrey Scott. "Time and place specific policies for controlling ozone precursor nitrogen oxides in New England's electric power sector." Thesis, Massachusetts Institute of Technology, 1994. http://hdl.handle.net/1721.1/35422.

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14

Ma, Xiaobo, and 馬？波. "Nitrogen flux analysis and its implications for environmental management in Huizhou, China." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2004. http://hub.hku.hk/bib/B30157274.

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15

Chen, Wan-Ru. "Interactions of tetracycline antibiotics with dissolved metal ions and metal oxides." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/24698.

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Thesis (Ph.D.)--Civil and Environmental Engineering, Georgia Institute of Technology, 2008.<br>Committee Chair: Huang, Ching-Hua; Committee Member: Kim, Jaehong; Committee Member: Pavlostathis, Spyros; Committee Member: Stack, Andrew; Committee Member: Yiacoumi, Sotira

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HAMA, PATRICIA. "Estudo da influencia da chuva acida na concentracao de aluminio em solos proximos a uma termoeletrica a carvao." reponame:Repositório Institucional do IPEN, 2001. http://repositorio.ipen.br:8080/xmlui/handle/123456789/10951.

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Made available in DSpace on 2014-10-09T12:46:00Z (GMT). No. of bitstreams: 0<br>Made available in DSpace on 2014-10-09T14:04:46Z (GMT). No. of bitstreams: 1 07316.pdf: 5554844 bytes, checksum: f2a2161155dc5992abc29a9496405892 (MD5)<br>Dissertacao (Mestrado)<br>IPEN/D<br>Instituto de Pesquisas Energeticas e Nucleares - IPEN/CNEN-SP

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17

Mainord, Jacinda L. "Investigation of Ambient Reactive Nitrogen Emissions Sources and Deposition in the Columbia River Gorge National Scenic Area." PDXScholar, 2017. https://pdxscholar.library.pdx.edu/open_access_etds/3621.

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Anthropogenic reactive nitrogen is emitted into the atmosphere from fossil fuel combustion (nitrogen oxides) and agricultural activities (nitrogen oxides and ammonia). Nitrogen oxide emissions have long been controlled for their role in ambient air pollution and human health effects. However, reactive nitrogen deposition is less understood even though it can play a significant role in altering biodiversity, impairing ecosystem and biogeochemical function and degrading cultural artifacts. Although nitrogen deposition is a natural part of biogeochemical cycling, many ecosystems across the United

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18

Dolan, Bianca Christine. "Effects of Increased Nitrogen Deposition on the Dominance of Hedera helix in the Pacific Northwest." PDXScholar, 2013. https://pdxscholar.library.pdx.edu/open_access_etds/680.

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Increased nitrogen deposition has been shown to promote the dominance of invasive species, and nitrogen deposition rates have steadily increased in most of the Western United States in recent years due to population increases. The purpose of this study was to determine if increased rates of nitrogen deposition are contributing to the success of Hedera helix in the Pacific Northwest. Plots were established in Lesser Park in Portland, Oregon and received monthly treatments of ammonium nitrate for one year. Growth, measured as change in percent cover, was compared between treated and untreated pl

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19

Haynes, Comas Lamar. "Simulation of tubular solid oxide fuel cell behavior for integration into gas turbine cycles." Diss., Georgia Institute of Technology, 1999. http://hdl.handle.net/1853/21797.

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20

Moss, Stuart Alan. "Nitrogen availability and pine seedling growth in organically- amended mine soils." Thesis, Virginia Polytechnic Institute and State University, 1986. http://hdl.handle.net/10919/101135.

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Adequate supply and availability of nitrogen (N) is a major factor hindering successful revegetation of reclaimed surface mines. Because topsoils are often unrecoverable, “topsoil substitutes”, made up of overburden materials devoid of N, are often used on reclaimed surfaces. Four replications of seven surface treatments were applied to 12 m² plots of 2:1 sandstone:siltstone material on a reclaimed coal surface mine in Wise Co., VA: 1) fertilizer (168 kg/ha N, 147 kg/ha P, and 139 kg/ha K), 2) limed (7.8 Mg/ha), fertilized topsoil (30 cm deep), 3) 112 Mg/ha sawdust + fertilizer + 336 kg/ha slo

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21

Sears, Jill R. "Spatial Distribution of Nitrogen Oxides, Benzene, Toluene, Ethylbenzene, and Xylenes in Hillsborough County, Florida| An Investigation of Impacts of Urban Forests on Ambient Concentrations of Air Pollutants Associated with Traffic." Thesis, University of South Florida, 2014. http://pqdtopen.proquest.com/#viewpdf?dispub=1548512.

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<p> Urban air pollution is responsible for high levels of morbidity and mortality in exposed populations due to its effects on cardiovascular and respiratory function. Transportation-related air pollutants account for the majority of harmful air pollution in urban areas. Forests are known to reduce air pollution through their ability to facilitate dry deposition and atmospheric gas exchange. This work characterizes the interactions between transportation air pollutants and urban forests in Hillsborough County, Florida. A highly spatially resolved passive air sampling campaign was conducted

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22

Jablonski, Leanne M. "Reproductive response to elevated CO2 : the roles of vegetative carbon storage, nitrogen and seed traits." Thesis, McGill University, 1997. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=34646.

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This study focused on the reproductive response to elevated CO2 of plants possessing below-ground storage. I tested the hypotheses that under elevated CO2: (1) Plants with greater non-foliar storage capacity win show more reproductive response and (2) The altered foliar physiology of carbon (C) and nitrogen (N) use will cause increases in seed number and quality. Carbon dioxide treatments of High (650 muL L-1) and Ambient (360 muL L-1) were used in a controlled environment, simulated growing season, and in a natural pasture community. Hypothesis 1 was tested experimentally using four Raphanus

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23

Villinski, John Eugene. "Reductive dissolution of manganese (IV) oxides and precipitation of iron (III) : implications for redox processes in an alluvial aquifer affected by acid mine drainage." Diss., The University of Arizona, 2001. http://etd.library.arizona.edu/etd/GetFileServlet?file=file:///data1/pdf/etd/azu_e9791_2001_96_sip1_w.pdf&type=application/pdf.

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24

Sweeney, Andrew Jeffrey. "Computer Simulation and Optimization of the NOx Abatement System at the Radford Facility and Army Ammunition Plant." Thesis, Virginia Tech, 1999. http://hdl.handle.net/10919/31404.

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This thesis discusses findings gained through work with the NOx abatement system at Radford Facility and Army Ammunition Plant (RFAAP). Removal of harmful substances from flue-gas emissions has garnered increased priority in the chemical industry in preceding decades, as governmental restrictions on these substances become more stringent and as national awareness concerning environmental quality and resource utilization continues to grow. These reasons make the study of NOx abatement an important and challenging endeavor. This work concerns itself specifically with reduction of NOx in flue-

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25

Norwood, Sasha Norien. "Characterization of Nano-scale Aluminum Oxide Transport Through Porous Media." PDXScholar, 2013. https://pdxscholar.library.pdx.edu/open_access_etds/981.

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Land application of biosolids has become common practice in the United States as an alternative to industrial fertilizers. Although nutrient rich, biosolids have been found to contain high concentrations of emerging contaminants (e.g. pharmaceuticals, personal care products) while containing a significant fraction of inorganic nano-scale colloidal materials such as oxides of iron, titanium, and aluminum. Given their reactivity and small size, there are many questions concerning the potential migration of these nano-sized colloidal materials through the soil column and into our surface and grou

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26

Johnson, Terrence G. "A model of nitrate leaching from agricultural systems in the northern neck of Virginia." Diss., Virginia Tech, 1992. http://hdl.handle.net/10919/37887.

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A model (VTCROPS) was developed to simulate the long-term effects of nitrogen (N) leaching to groundwater in the Northern Neck region of Virginia, and ultimately to the Chesapeake Bay. VTCROPS simulates N fate and transport in a soil-plant-atmosphere continuum in a vertical slice between two crop rows, enabling consideration of nonuniform fertilizer placement and root growth patterns. VTCROPS models atmospheric, soil and crop subsystems. Atmospheric conditions (rainfall, temperature, solar radiation) may be directly input by the user or generated using a stochastic climatic generator. The soil

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27

Downing, T. G. "The role of nitrogen in the regulation of microcystin content in Microcystis aeruginosa." Thesis, Stellenbosch : Stellenbosch University, 2005. http://hdl.handle.net/10019.1/50523.

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Thesis (PhD)--University of Stellenbosch, 2005.<br>ENGLISH ABSTRACT: Several genera of cyanobacteria produce a range of toxins. The increased rate of eutrophication of surface fresh waters due to anthropogenic inputs has resulted in more frequent and severe cyanobacterial bloom events. Such bloom events make impoundments unsuitable for recreational use and increase the cost of production of potable water due to the necessity for removal of toxins released from cells during the purification process. Microcystis aeruginosa is the major freshwater bloom-forming toxic cyanobacterium. Conce

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28

TORRES, JARDÓN RICARDO. "COMPARATIVE ASSESSMENT OF THE SENSITIVITY OF OZONE TO NITROGEN OXIDES AND VOLATILE ORGANIC COMPOUNDS IN TWO DISSIMILAR METROPOLITAN AREAS OF NORTH AMERICA: CINCINNATI, OH (U.S.A.) AND MEXICO CITY, DF (MEXICO)." University of Cincinnati / OhioLINK, 2004. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1100032213.

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29

David, Clive Addison. "Post-harvest floor changes and nitrogen mobilization in an Engelmann spruce-subalpine fir forest." Thesis, University of British Columbia, 1987. http://hdl.handle.net/2429/26986.

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Engelmann spruce-subalpine fir [Picea engelmannii Parry ex Engelm.-Abies lasiocarpa (Hook.) Nutt.] (ESSF) forests occupy large portions of western North America, and of British Columbia (B.C.) in particular. These areas represent a harsh environment for plant growth. The ESSF forests of B.C. have presented serious problems of regeneration following harvesting; several factors stimulated speculation as to whether N supply limitations were involved. This study was intended to highlight the post-harvest N dynamics of an ESSF forest, and the implications of the latter for silvicultural practices.

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30

Rao, Meenakshi. "Investigating the Potential of Land Use Modifications to Mitigate the Respiratory Health Impacts of NO2| A Case Study in the Portland-Vancouver Metropolitan Area." Thesis, Portland State University, 2016. http://pqdtopen.proquest.com/#viewpdf?dispub=10131547.

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<p>The health impacts of urban air pollution are a growing concern in our rapidly urbanizing world. Urban air pollutants show high intra-urban spatial variability linked to urban land use and land cover (LULC). This correlation of air pollutants with LULC is widely recognized; LULC data is an integral input into a wide range of models, especially land use regression models developed by epidemiologists to study the impact of air pollution on human health. Given the demonstrated links between LULC and urban air pollution, and between urban air pollution and health, an interesting question arises

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31

Smith, Ronald David. "The influence of air mass origin on the wet deposition of nitrogen to Tampa Bay, Florida." [Tampa, Fla. : s.n.], 2003. http://purl.fcla.edu/fcla/etd/SFE0000099.

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32

Bhathena, Jasmine. "The physical and physiological effects of nitrogen and phosphorus limitation on a pulp and paper mill effluent biotreatment microbial community /." Thesis, McGill University, 2004. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=80228.

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The influence of nitrogen (N) and phosphorus (P) limitation on pulp and paper mill activated sludge (AS) floc properties was studied using a bioreactor fed with synthetic Kraft mill effluent. The bioreactor and synthetic effluent were designed and shown to perform like the real mill system providing the AS, establishing the in vivo relevance of the results. Limitation of either N or P produced inadequate effluent biotreatment, shown by poor BOD5 and suspended solids removal, and by decreased biomass health, performance, and floc settling. Greatly enhanced poly-beta-hydroxybutyrate (PHB)

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33

Sears, Jill. "Spatial Distribution of Nitrogen Oxides, Benzene, Toluene, Ethylbenzene, and Xylenes in Hillsborough County, Florida: An Investigation of Impacts of Urban Forests on Ambient Concentrations of Air Pollutants Associated with Traffic." Scholar Commons, 2013. http://scholarcommons.usf.edu/etd/4842.

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Urban air pollution is responsible for high levels of morbidity and mortality in exposed populations due to its effects on cardiovascular and respiratory function. Transportation-related air pollutants account for the majority of harmful air pollution in urban areas. Forests are known to reduce air pollution through their ability to facilitate dry deposition and atmospheric gas exchange. This work characterizes the interactions between transportation air pollutants and urban forests in Hillsborough County, Florida. A highly spatially resolved passive air sampling campaign was conducted to c

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34

Ling, Ge. "Assessment of nitrate leaching in the unsaturated zone on Oahu." Thesis, Water Resources Research Center, 1996. http://hdl.handle.net/10125/21929.

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Groundwater contamination caused by agricultural fertilization is a widely recognized problem. In Hawaii, nitrogen fertilization from pineapple and sugarcane fields has posed a threat to several basal aquifers and has been implicated in coastal algae blooms. The concentration of nitrate-N in the Pearl Harbor basin on the island of Oahu was below 2.3 mg/L in the 1950’s and 1960’s, and has increased to as much as 7.6 mg/L in 1992 to 1994. The objective of this dissertation research is to develop a practical methodology for realistically estimating nitrate leaching from fertilized agricultural la

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35

Laurinaitis, Kastytis. "Dyzelinio variklio darbo proceso homogeniniu oro ir bioetanolio mišiniu tyrimas." Doctoral thesis, Lithuanian Academic Libraries Network (LABT), 2014. http://vddb.library.lt/obj/LT-eLABa-0001:E.02~2014~D_20140630_092709-45813.

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Darbe tirta tiekiamo oro temperatūros, deginių recirkuliacijos ir degalų savybių įtaka suslėgimu uždegamo homogeninio oro – bioetanolio mišinio degimo procesui, variklio darbo ir deginių emisijos rodikliams. Nustatytos variklio darbo homogeniniu oro – bioetanolio mišiniu maksimalios apkrovos zona, kurią riboja slėgio didėjimo greitis ir susidarantis detonacinis degimas. Gautieji rezultatai varikliui veikiant bioetanoliu, lyginti su rezultatais gautais varikliui veikiant baziniais degalais – benzinu. Dyzeliniam varikliui dirbant homogeniniu oro ir bioetanolio mišiniu, keičiant tiekiamo oro temp

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周厚華 and Donna Chaw. "Biochemical changes in the fermentation bedding of the "pig-on-litter"method of pig farming: with special emphasison biodegradation of nitrogen compounds and odour production." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1996. http://hub.hku.hk/bib/B43893740.

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Ndobeni, Afika. "Effect of temperature and carbon to nitrogen ratio on the performance of an upflow anaerobic sludge blanket reactor treating sugarcane molasses." Thesis, Cape Peninsula University of Technology, 2017. http://hdl.handle.net/20.500.11838/2622.

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Thesis (MTech (Chemical Engineering))--Cape Peninsula University of Technology, 2018.<br>The sugar industry contributes to the development of the economy in many countries, including South Africa. The wastewater generated by this industry has a high pollution load, and therefore requires treatment before discharge to the environment. The primary aims of this study were to determine the performance of an upflow anaerobic sludge blanket (UASB) reactor treating sugarcane molasses and to develop an empirical model to predict the behaviour of the UASB in terms of chemical oxygen demand (COD) remova

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Stewart, Alan V. "Plant breeding aspects of ryegrasses (Lolium sp.) infected with endophytic fungi." Phd thesis, University of Canterbury. Lincoln College, 1987. http://theses.lincoln.ac.nz/public/adt-NZLIU20071005.172250/.

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Some aspects of the presence of systemic endophytic fungi in agriculturally important New Zealand grasses were studied in relation to plant breeding. Seedling resistance to adult Argentine stem weevil feeding in perennial ryegrass, Italian ryegrass and tall fescue was found to be related to the presence of their respective Acremonium endophytes in the seed rather than to plant genetic resistance. In addition a study of perennial ryegrass revealed that this resistance was independent of endophyte viability. The seedling resistance conferred by the endophyte of Italian ryegrass was found to be b

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Cleghorn, Charles 1970. "Effect of soil covers on coal waste dumps in KwaZulu-Natal on abiotic factors and bacteria causing acid mine drainage." Thesis, Stellenbosch : Stellenbosch University, 1997. http://hdl.handle.net/10019.1/55521.

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Thesis (MSc)--Stellenbosch University, 1997.<br>ENGLISH ABSTRACT: The activity of iron-oxidizing bacteria, for example, Thiobacillut. ferrooxidans, in the outer layers of coal waste dumps results in the oxidation of pyrite with the formation of large volumes of acid mine drainage. The process requires atmospheric oxygen and moisture. Acid mine drainage may possibly be controlled by creating unfavourable environmental conditions in dumps for the iron-oxidizing bacteria. The present research investigated the possibility of inhibiting these bacteria and consequently acid formation in coal w

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Modinger, Heinrich. "Micro-organisms involved in iron oxidation and acid mine drainage formation in KwaZulu-Natal and their control by soil covers on coal waste dumps." Thesis, Stellenbosch : Stellenbosch University, 1998. http://hdl.handle.net/10019.1/55926.

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Thesis (MSc)--Stellenbosch University, 1998.<br>One copy microfiche.<br>ENGLISH ABSTRACT: The biologically catalysed oxidation of pyrite in the outer layers of coal waste dumps leads to the formation of acid mine drainage. The oxidation of pyrite to ferric iron and sulphate is a complex process involving various abiotic and biologically catalysed reactions. Pyrite is abiotically oxidized by ferric iron, with the formation of thiosulphate and ferrous iron. Thiosulphate decomposes to form various inorganic sulphur compounds. Bacterial catalysis of pyrite oxidation is achieved by iron-oxidi

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Yung, Matthew Maurice. "Oxidation catalysis in environmental applications nitric oxide and carbon monoxide oxidation for the reduction of combustion emissions and purification of hydrogen streams /." Columbus, Ohio : Ohio State University, 2007. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1187128442.

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Paixão, Filho Jorge Luiz da 1984. "Aplicação de lodo de lagoa facultativa em roseira." [s.n.], 2012. http://repositorio.unicamp.br/jspui/handle/REPOSIP/258485.

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Orientadores: Adriano Luiz Tonetti, Bruno Coraucci Filho<br>Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Civil, Arquitetura e Urbanismo.<br>Made available in DSpace on 2018-08-20T18:04:49Z (GMT). No. of bitstreams: 1 PaixaoFilho_JorgeLuizda_M.pdf: 2379245 bytes, checksum: 00497843fd17605c51498a78155246f6 (MD5) Previous issue date: 2012<br>Resumo: A geração de lodo de esgoto (LE) é uma característica intrínseca do tratamento das águas residuárias por processos biológicos. Aliado a isso, o aumento do número de estações de tratamento de esgoto tem demandad

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Sherman, Jessica F. "Soil Iron, Aluminum, and Phosphorus Dynamics in Response to Long-Term Nitrogen and Sulfur Additions at the Bear Brook Watershed in Maine." Fogler Library, University of Maine, 2005. http://www.library.umaine.edu/theses/pdf/ShermanJF2005.pdf.

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Truini, Margot. "The use of Hydrochemistry to Identify Potential Processes Operating in the Saddle Mountains Basalt Aquifer and the use of the Nitrate-nitrogen Isotope to Distinguish between Potential Sources of Nitrate to the Shallow Alluvial Aquifer in the Lower Umatilla Basin, Oregon." PDXScholar, 1996. https://pdxscholar.library.pdx.edu/open_access_etds/5206.

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Nitrate concentration in excess of national drinking-water standards (10 mg/l) are present in the shallow alluvial aquifer and Saddle Mountains Basalt (SMB) aquifer in the Lower Umatilla Basin, Oregon. To determine sources responsible for elevated nitrate concentrations in the SMB aquifer mass-balance and reaction-path models (NETPATH and PHREEQE) were used to understand observed geochemical trends. Nitrate-nitrogen isotopes were used to distinguish potential nitrate sources in the shallow alluvial aquifer. NETPATH-validated simple water/rock reactions in the SMB aquifers in Irrigon (dissolvin

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Hernandez-Romo, Adriana. "An analysis of nitrate contaminated water in Cherry Valley." CSUSB ScholarWorks, 2005. https://scholarworks.lib.csusb.edu/etd-project/2726.

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The purpose of this study was to evaluate the level of nitrate contamination in the water in Cherry Valley. It examines the theory that human effluent is the source of the nitrate and evaluates the role of politics in the nitrate issue.

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Lalor, Briony Maree. "An assessment of the recovery of the microbial community in jarrah forest soils after bauxite mining and prescription burning." University of Western Australia. School of Earth and Geographical Sciences, 2009. http://theses.library.uwa.edu.au/adt-WU2010.0037.

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[Truncated abstract] Recovery of soil nutrients, microbial populations and carbon (C) and nitrogen (N) cycling processes are critical to the success of rehabilitation following major ecosystem disturbance. Bauxite mining represents a major ecosystem disturbance to the jarrah (Eucalyptus marginata) forest in the south-west of Western Australia. Mining has created a mosaic of mined areas in various stages of succession surrounded by non-mined forest areas. Initial site preparations within rehabilitation areas such as contour ripping alter soil structure (creation of mound and furrows) and over t

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Pattinson, Woodrow Jules. "An investigation into local air quality throughout two residential communities bisected by major highways in South Auckland, New Zealand." Thesis, University of Canterbury. Environmental Science, 2014. http://hdl.handle.net/10092/10002.

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Population exposure to traffic pollution is a rapidly developing, multi-disciplinary scientific field. While the link between long-term exposure and respiratory issues is well-established, there are probable links to a number of more serious health effects, which are still not fully understood. In the interests of protecting human health, it is prudent that we take a cautionary approach and actively seek to reduce exposure levels, especially in the home environment where people spend a significant portion of their time. In many large cities, a substantial number of homes are situated on land i

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Brittain, Jeffrey Thomas. "The Response of Zooplankton Communities in Montane Lakes of Different Fish Stocking Histories to Atmospheric Nitrogen Deposition Simulations." PDXScholar, 2015. https://pdxscholar.library.pdx.edu/open_access_etds/2394.

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Freshwater ecosystems are subject to a wide variety of stressors, which can have complex interactions and result in ecological surprises. Non-native fish introductions have drastically reduced the number of naturally fishless lakes and have resulted in cascading food web repercussions in aquatic and terrestrial habitats. Additional anthropogenic influences that result from increases in global airborne emissions also threaten wildlife habitat. Atmospheric nitrogen deposition has been recognized as an anthropogenic contributor to acidification and eutrophication of wilderness ecosystems. Plankto

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Šiuipys, Nerijus. "Priežemio ozono koncentracijos sklaida Kauno mieste ir jos ryšys su meteorologinėmis sąlygomis." Master's thesis, Lithuanian Academic Libraries Network (LABT), 2009. http://vddb.library.lt/obj/LT-eLABa-0001:E.02~2009~D_20090810_112539-45872.

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Viena didžiausių problemų, atsirandančių dėl oro taršos miestų ore, yra tarša, sukelta fotocheminių oksidantų, tarp jų, ir priežemio ozono. Darbo tikslas: nustatyti priežemio ozono koncentracijos sklaidą Kauno mieste ir jos ryšį su meteorologinėmis sąlygomis. Tyrimai buvo vykdomi 2006 - 2009 metais. Darbo objektas - Kauno miestas. Visoje miesto teritorijoje priežemio ozono koncentracija buvo matuota 10 skirtingų matavimo vietų. Ozono koncentracijai nustatyti buvo naudotas „Aeroqual 300 Series” ozono matuoklis. Priežemio ozono koncentracija buvo matuota vidudienį nuo 12 iki 14 ir vakare nuo 17

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Simpson, Lisa G. "Impact of long-term manure application on soil macronutrient levels in Southern Alberta." Thesis, Lethbridge, Alta. : University of Lethbridge, Dept. of Geography, c2010, 2010. http://hdl.handle.net/10133/3098.

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The role of manure applications on soil nutrient dynamics in years after manure applications cease has not been extensively studied. An investigation of two long-term manure trials in the Battersea Drain watershed in southern Alberta was undertaken in 2004 to determine changes in soil nutrient status three years after the initial study was completed. The investigation of the nutrient status of an intensive livestock operation was another component of the study. There was a significant decrease in levels of soil nitrogen, phosphorus and potassium in the plots that received manure application

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