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 48 for “"Nitrate removal"”.
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Long term nitrate removal in a denitrification wall
… testing new ways to remove N (in the form of nitrate (NO3-)) from groundwater, 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 …
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Residence Time Distributions in Constructed Wetlands and Their Application to Modeling Nitrate Removal
Nitrate was used as a on-conservative compound along with a conservative compound to assess mass transport at the soil-water interface. Calibration of these tests yielded nitrate mass transfer coefficients. Even though no particular trend was observed for the nitrate mass transfer coefficients, the …
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Simulation and Optimization of a Constructed Wetland for Biomass Production and Nitrate Removal
… Constructed wetlands offer a promising nutrient removal mechanism while also providing an ideal environment for the growth of such grasses. In the present work, a hypothetical wetland system is designed to treat non-point source nutrient loadings and produce harvestable biomass for ethanol …
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Cumulative Impacts of Stream Restoration on Watershed-Scale Flood Attenuation, Floodplain Inundation, and Nitrate Removal
… a single watershed on flooding and nutrient removal. Previous studies have quantified the effects of stream restoration on flood attenuation. However, our first study fills a substantial knowledge gap by evaluating the impacts of different floodplain restoration practices, varied by location …
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Watershed Scale Impacts of Floodplain Restoration on Nitrate Removal and the Practical Applications of Modeling Cumulative Floodplain Restoration Hydraulics
… Stage-0 and bankfull floodplain restoration on nitrate removal in a generic 4th-order Virginia Piedmont watershed for small and sub-annual storm sizes (i.e. 2-year, 1-year, half-year, and monthly recurrence intervals). We used HEC-RAS hydraulics results from a prior study together with a nitrate …
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The Evaluation of Permeable Cementitious Media for Nutrient Removal
… systems have been studied for contaminant removal, but there are limitations to the current state of knowledge. Laboratory studies were utilized to fundamentally characterize permeable cementitious media for the removal of nitrate-nitrogen and orthophosphate-phosphorus. Batch reactor tests …
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Carbon dosing of denitrifying bioreactors to remove nitrate from agricultural drainage
… woodchips bioreactors effectively remove nitrate from a broad spectrum of wastewater. Even though bioreactors have a comparatively small spatial footprint and are straightforward to construct, the low long-term nitrate removal efficiency they provide compared to other mitigation options, …
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Compost Bioreactors for Removing Agricultural Chemicals From Tile Drainage Water
… denitrification in column studies. The extent of nitrate removal depended on the solid retention time, but could also have been influenced by the amount of compost in the column that could be utilized as an energy source by denitrifying microorganisms. The results of this study suggested that …
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Mechanism of virus removal and nutrient reduction and modification of bio-sand filter
… of this study were to assess the role of nitrate and ammonia concentrations in the feed water on the removal of bacteriophage MS2 using bio-sand filters (BSFs) and analyze the formation of the bacterial community in BSFs, and modify BSFs with different packing materials and structures. …
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Denitrifying woodchip bioreactors for aquaculture manifold design and potential water reuse
… RAS production currently lacks an affordable nitrate reduction technology. Early studies on denitrifying woodchip bioreactors, a biological nitrate-remediation system, have demonstrated their potential for RAS wastewater treatment. Bioreactors are highly effective at nitrate removal via the …
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Dissolution and Biokinetics of PCL in Denitrification Systems
… and sustainable alternative carbon source for nitrate removal in wastewater treatment systems.
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Performance, denitrification activity, and microbial community dynamics of denitrifying biofilters under fluctuating water level
… as a technology that reduces the export of nitrate from tile-drained fields. A better understanding of the microbial communities that allow the biofilter to function may provide insight to improve performance. Two studies were performed to achieve this aim. Laboratory-scale biofilters were …
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Effects of Using Clay Nanoparticles as a Soil Amendment to Remove Nitrate from Stormwater
… is used to treat stormwater pollutants such as nitrate, phosphorus, total suspended solids, and metals. Past research has indicated that the removal efficiency of nitrate by bioretention cells greatly varies from a 75% reduction in nitrate concentration to the addition of nitrate in the effluent …
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Microbial community analysis for denitrifying biofilters
… and low-maintenance technology for removing nitrate from agricultural drainage, capable of removing 50-80% of annual nitrate loads. Because increased riverine nitrate concentrations are correlated with indicators of eutrophy and degradation of coastal waters, including a large hypoxic zone in …
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Greenhouse Gas Production and Nutrient Reductions in Denitrifying Bioreactors
… DNBR research has established successful nitrate removal, whereas this study examines the potential to expand DNBR functionality to address excess phosphorus and mitigate the production of nitrous oxide, a potent greenhouse gas. Results from a laboratory experiment supported the hypothesis …
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Nitrogen Removal from Closed Aquaculture System by Bio-electrochemical System
Removal of nitrogen elements in culture water is one of the major concerns in recirculating aquaculture system (RAS). Maintaining a low concentration of nitrogen compounds is essential for a good quality of aquaculture production. Due to fish is very sensitive to the toxic ammonium/ammonia, …
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Microbial fuel cells coupled with open pond for wastewater treatment: is it viable?
… water body for energy production and contaminant removal. This MS project aims to explore whether it will be viable to apply SMFCs for wastewater treatment. Experimental SMFCs were studied in several configurations and operational modes for organic removal, nitrate reduction, and energy recovery. …
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Assessment of a Fixed Media Partial Denitrification/Anammox Process Startup in a Full-Scale Treatment Train
… can be used to effectively remove ammonia, nitrate, and nitrite from mainstream municipal waste streams. To retain slow growing anammox, some sort of retention system is needed with media being a common solution to this problem. PdNA has been successfully implemented in mainstream full-scale …
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Removal of nitrate from contaminated groundwater by floating alginate beads
Elevated levels of dissolved nitrate in waterways, particularly in groundwater, is a common and serious environmental problem that remains largely unsolved despite intensive research efforts. Major risks posed by dissolved nitrate in water are two-fold: (a) it is hazardous to human health, and (b) …
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