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 65 for “"Nitrate-nitrogen"”.
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Measurement and Modeling of Nitrate-Nitrogen Transport in Subsurface Bioreactors
… was selected for this study. The nitrate-N concentrations of the bioreactor were monitored in 16 monitoring wells installed at 1.5 m intervals and 0.76 m from each corner. A Finite Element Method routine was used for transient, two-dimensional groundwater flow, and the Random Walk …
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Evaluation and prediction of hydrology and nitrate-nitrogen transport in tile-drained watersheds
… altered hydrology, and increased transport of nitrate-nitrogen (NO3-N) to surface water. The direct link between subsurface tile drainage and transport of nonpoint-source pollutants, particularly NO3-N, to surface waters is a primary concern for downstream drinking water supplies and hypoxia in …
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Effect of different kinds of organic materials & fertilizers on the accumlation of ammonia & nitrate nitrogen in composts
Thesis (M.S.)--Michigan State College of Agriculture and Applied Science. Dept. of Soils, 1940
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Evaluating effects of water quality BMPs on nitrate-nitrogen losses and crop yield at field and watershed scales
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2023-12-01
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The effect of fertilizers on the vegetative composition of a hay mixture and on the total nitrogen, nitrate nitrogen, and lime requirements of soils planted to different crops
… in the hay, on the plays. Part II deals with the Nitrates, total Nitrogen, and Lime requirements of the soil on the different plats.
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Nutrient Transport in the Lake Poinsett System
… 1.66 x 104 kg (PO4) phosphorus, 1.28 x 104 kg nitrate nitrogen, and 3.90 x 104 kg organic carbon. The Big Sioux River-Dry Lake system contributed 63% of the phosphorus, 45% of the nitrate nitrogen, and 43% of the organic carbon load. The remaining portion entered Lake Poinsett from the Lake …
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The link between Permeable Interlocking Concrete Pavement (PICP) design and nutrient removal
… for the treatment of various nutrients (ammonia-nitrogen, orthophosphate-phosphorus and nitrate-nitrogen) commonly found in stormwater runoff. Ten experimental cells each housing a different permeable pavement design were constructed in the NEB laboratory at the UCT. Infiltration tests (ASTM …
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Evaluation of an Effluent Treatment Strategy to Control Nitrogen From a Recirculating Aquaculture Facility
… and stoichiometrically under different initial nitrate-nitrogen and soluble organic carbon to nitrate-nitrogen ratios. Characterization of soluble organic carbon (measured as soluble chemical oxygen demand, sCOD) indicated that volatile fatty acids (VFA) were generated during the fermentation of …
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Impedance-based moisture content sensor assessment for gas-phase biofilters
… well as different particle size distribution and nitrogen (ammonia-nitrogen, nitrate-nitrogen) concentrations of biofilter media. The results show that both particle size distribution and nitrogen concentrations significantly affected impedance-based moisture sensing. A mathematical model was …
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Columnar denitrification of a munitions waste
The removal of nitrate nitrogen from a munitions waste by means of bacterial reduction was investigated using packed anaerobic columns. The feasibility of using a munitions waste high in organic carbon (Water Dry Process Waste) as the organic carbon source was also investigated. Simultaneously the …
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Mineral requirements of selected species of aquatic hyphomycetes
… replicates were averaged. Phosphorus, calcium, nitrogen, zinc, iron, magnesium, and sulfur requirements were demonstrated for all four species. Efforts to demonstrate requirements for potassium were unsuccessful. Manganese toxicity was demonstrated for Clavariopsis aquatica DeWildeman and a …
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Septic tank nutrients in groundwater entering Lake Sallie, Minnesota
… the septic tank but. 40% of the effluent nitrogen reached the lake. Sampling lakeward and landward of five septic tanks indicated that nitrate and possibly ammonium ions travel in groundwater and that nitrogen is contributed to groundwater by septic tanks. </p><p> Seepage entering the lake …
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Evaluation of Constructed Wetlands for the Waste Management of a Large Scale Swine Production Unit
… the result of testing for the following: ammonia nitrogen, nitrate nitrogen, total phosphorus, total suspended solids, dissolved solids, dissolved oxygen, biological oxygen demand, and Fecal Coliform Bacteria. The wetland was divided into nine connected cells that covered approximately 3.8 …
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Studies of the resistance of tobacco to a second attack of Peronospora tabacina adam
… soil in the greenhouse were analyzed for ammonia-nitrogen, nitrate-nitrogen, reducing sugars and total sugars. Similar analyses were made of samples of leaf tissue from tobacco plants grown in crocks of quartz sand and irrigated with nutrient solutions and from plants grown in crocks of sand-peat …
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Developing methods of strip cropping cucumbers with rye/vetch
… on pest and beneficial insects, petiole sap nitrate-nitrogen, soil moisture, yields and economic viability were assessed. Four treatments, namely cucumber direct seeded in black plastic mulch on tilled bare ground (conventional); cucumber direct seeded in black plastic mulch laid over …
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Effect of pH on the denitrification of activated sludge effluent at high oxygen tensions
… given by sanitary engineers to the problem of nitrogen removal in sewage treatment. This attention is brought about by several problems associated with nitrogen. First, in some locations, such as our southwest United States, there is both an essentially constant supply of water and an …
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Managing Cattail (Typha latifolia) Growth in Wetland Systems
… examined. Soluble reactive phosphorous (SRP), nitrate-nitrogen (NO3-N), and ammonia-nitrogen (NH3-N) removals were tested at a constructed wetland receiving municipal wastewater effluent. Over all, no significant differences in nutrients occurred between diverse planted and cattail areas. T. …
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Lipid Production from a Louisiana Native Chlorella vulgaris/Leptolyngbya sp. Co-culture for Biofuel Applications
… of this co-culture via optimizing irradiance and nitrogen levels, lipid extraction method and modeling of pilot photobioreactor (HISTAR). Effects of irradiance and nitrate nitrogen levels on total lipid yield, neutral lipid portion, and fatty acid profile of non-aerated and aerated co-cultures …
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An Uncertainty-Based Approach to the Total Maximum Daily Load Development
… Duration curves for dissolved oxygen and nitrate-nitrogen exhibit high variability in the load estimated using daily data as compared to those based on bi-weekly and monthly data. It is found that, the temporal scale-induced uncertainty in model outputs is linearly and inversely correlated …
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