Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 412 for “"denitrification"”.
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Modelling Denitrification In Soil
Denitrification is a process used by many bacterial species to support anaerobic respiration, where, faced with a lack of oxygen, energy is instead created from available nitrates. Arable soils with high nitrogen content, and commonly-used fertilisers, encourage this process. Unfortunately, the …
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Denitrification in Membrane Bioreactors
… not contain nitrate or nitrite. The volumetric denitrification rate was 240 g-N day-1 m-3, which is within the range of denitrification rates obtained in tubular membrane modules. The treated effluent contained acetate, the carbon source of the biological process, and other inorganic nutrients, …
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Columnar denitrification of a munitions waste
… detention time of 8.76 hours. No difference in denitrification capacity was found between columns packed with activated carbon or sand, but the activated carbon was found to be an undesirable media because of its low specific gravity which permitted it to float after gasification began, and …
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Denitrification Under Salinity Stress in Biofilm Reactors
Denitrification represents a sustainable solution to remove nitrate from saline wastewaters generated by many industrial activities such as food processing, aquaculture, flue gas washing, etc. To improve the process’ performance under salinity inhibition, biofilm reactors could represent an elegant …
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A novel membrane process for autotrophic denitrification
… using hydrogen-oxidizing bacteria. Autotrophic denitrification is a biological process that reduces nitrate to nitrogen gas using an inorganic carbon source. Hydrogen gas is an electron donor and nitrate is the electron acceptor in the reaction. The specific research objectives were to:</p> <ul> …
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The regulation of denitrification in P. denitrificans
… compete for the binding sites upstream of the denitrification operons in a way that optimizes the metabolic rates of denitrification and subsequently eliminates the accumulation of toxic denitrification intermediates. Therefore a new model of regulation of denitrification in P. denitrificans is …
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Evaluating the Potential for Denitrification in PICP
… the inclusion of a submerged zone to improve denitrification. Since permeable interlocking concrete pavements (PICPs) are the most widely used PP structure internationally, this study investigated the potential for denitrification in PICP through the incorporation of a submerged zone in its …
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Reassessment of Biowish Activation Procedure for Denitrification
… multi-bacteria culture with the capability of denitrification. If an anaerobic nitrate rich activation procedure is used instead of the standard aerobic activation procedure, the denitrification rate is increased by 28 percent under the conditions of 30°C, 1C:1N, 200mg/L of carbon, and 200mg/L …
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Dissolution and Biokinetics of PCL in Denitrification Systems
… solid-phase carbon source for wastewater denitrification. Laboratory experiments examined the effects of temperature, bead mass, solvent type, hydraulic retention time, and bead reuse on PCL dissolution and soluble chemical oxygen demand (SCOD) release. The dissolution behavior was …
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Long term nitrate removal in a denitrification wall
… primarily through enhancing microbial denitrification. One technology utilizing this microbial process is a denitrification wall, which is an inexpensive, low-maintenance technology compared to other options to treat NO3--contaminated groundwater. Denitrification walls have been shown …
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Nitrification and denitrification in the activated sludge process
… of the single-sludge nitrification-denitrification process were investigated using influent organics as the carbon source and nitrate as an electron acceptor to see if any oxygen savings could be obtained. The key research tools used were mathematical modeling, computer simulation, …
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Modeling Groundwater Denitrification by Ferrous Iron Using PHREEQC
… ingesting it leads to potential health risks. Denitrification, the only effective process to eliminate nitrate, is limited by the abundance of biologically available electron donors. Thus, understanding the natural denitrification capacity of aquifers, through the analysis of all the major …
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Denitrification in a best management practice bioretention system
… a saturated anoxic zone intended to facilitate denitrification. Soil samples were collected from six depths within the rain garden, four of which were within the saturated anoxic zone. These samples were analyzed using endpoint PCR, targeting total bacterial 16S rRNA or a denitrification gene …
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Denitrification response to nutrient enrichment in New Zealand estuaries
… organic-rich sediments. Nutrient processing and denitrification in estuarine sediments represent important ecosystem functions regenerating nutrients for primary producers, and regulating the ability to remove excess terrestrially derived nitrogen. Denitrification therefore offers resilience to …
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Possible Groundwater Denitrification in the Decorah Formation (Middle Ordovician)
… The shale may contain electron donors for denitrification in the forms of organic carbon and sulfur minerals. </p><p>Three shallow monitoring wells were installed and sampled, and sediment samples collected and analyzed to determine if denitrification is occurring within the Decorah …
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Laboratory denitrification using sediments from the Elk Valley Aquifer
… a decrease in the content of sulfides related to denitrification could be measured in the laboratory using sediments of the Elk Valley Aquifer in eastern North Dakota. The experiment entailed analyzing sediments for sulfides and solid organic carbon and isolating them in sample containers with a …
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Denitrification in the Elk Valley aquifer, northeastern North Dakota
<p> Biological denitrification controls nitrate distribution in the Elk Valley aquifer, which underlies approximately 725 square kilometres of northeastern North Dakota and provides drinking water for farms and rural communities in the area. Increased irrigation has raised concerns over potential …
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A methodology for studying denitrification by recently formed sulfides
… N2, through the bacterially mediated process of denitrification. During this process, bacteria gain energy by transferring electrons from an "electron donor" to nitrate, the "electron acceptor". It is typically believed that organic carbon is the most important electron donor in the …
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