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 26 for “"Nutrient Reduction"”.
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Mechanism of virus removal and nutrient reduction and modification of bio-sand filter
… These results suggest that the concentrations of nutrients in the feed water can influence the biofilm growth inside BSFs and can have a significant impact on virus removal.
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Targeted short-term nutrient reduction to manage Ventenata dubia an invasive winter annual grass: soil and plant responses
… below remnant targets. Early season short-term nutrient reduction to manage IWAGs is largely unexplored and would potentially decrease IWAG abundance, active earlier than most plants, but impact later season species less. Low rates of labile carbon, as sucrose, were applied to soils in a Pacific …
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Understanding subsurface hydrology of controlled drainage (drainage water management) and saturated buffers to optimize nutrient reduction goals in Illinois
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2024-05-01
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Sector-Targeting for Controlling Nutrient Loadings: A Case Study of the North Fork of the Shenandoah River Watershed
… quality standard. The economic costs of reducing nutrient loadings are often not taken into account during development. In this study, sector targeting is used to minimize the total cost of nutrient reduction by targeting sectors with lower costs per unit of pollution reduction. This study focuses …
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BMP Cost and Nutrient Management Effectiveness on Typical Beef and Beef-Poultry Farms in Shenandoah County, Virginia
… the change in whole-farm net revenues and nutrient reduction from the implementation of five best management practices (BMPs) on a typical beef and beef-poultry farm in Shenandoah County. Whole-farm net revenues, resource allocation, nutrient loss reductions, and the cost efficiency of …
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Two analyses of costs of agricultural NPS pollution: Transactions costs of expanding nutrient trading to agricultural working lands and Impacts of TCs and differential BMP adoption rates on the cost of reducing agricultural NPS pollution in Virginia
… represents the single largest source of nutrient loads to the Chesapeake Bay. Despite aggressive regulatory efforts in other nutrient source sectors, state authorities rely on educational programs and voluntary financial assistance programs to induce landowners to adopt best management …
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Modeling the formation of periodic hypoxia in partially mixed estuaries and its response to oligotrophication and climate change
… detrimental effects of anthropogenic nutrient enrichment in coastal marine ecosystems. Due to the physiological importance of oxygen as a key component of metabolic processes, the development and persistence of hypoxia can reduce the distribution of important species, modify food webs, …
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Assessment of total phosphorus concentration as a predictor and determinant of fishery productivity in southern Appalachian reservoirs: application to Smith Mountain Lake, Virginia
Phosphorus is often the limiting nutrient of primary productivity in southern Appalachian reservoirs, but its impact on higher trophic levels has not been assessed. Regression analysis was used to examine the relationship between total phosphorus concentrations and estimates of fish standing stock …
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Municipal wastewater treatment plants' nitrogen removal response to financial incentives in Maryland and Virginia
… (TMDL) for the entire watershed that established nutrient reduction targets to achieve Bay water quality objectives. The TMDL required states in the Chesapeake Bay watershed to create implementation plans to meet nutrient reductions. Maryland and Virginia specifically established stringent point …
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The Influence of Changing Nutrients and Warming on Phytoplankton and its Interactions with Zooplankton in the North Sea
… Hybrid interaction strengths increase under low nutrient and light availability. Bottom-up strength (from primary producers to grazers) is highest under high light availability, N:P between 20 and 25, and intermediate SST; whereas top-down strength (from grazers to primary producers) dominates …
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Evaluation of Passive Reduction of Salts and Nutrients from Greenhouse Effluent using Vegetated Bioreactors
… elevated concentrations of salts as well as nutrients such as nitrate and phosphate. The untreated release of this effluent can threaten the quality of our waters, while recycling it for repeated irrigation in greenhouses could reduce costs and save on water and nutrient resources. However, …
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Long-term spatiotemporal water quality and phytoplankton dynamics in Severn Sound, Ontario: a delisted great lakes area of concern
… disk visibility illustrate the influences of nutrient reduction strategies, and potential influences from invasive dreissenid mussels. Although an important driver of water quality changes, water temperature change was variable during the study, likely due to site-specific differences and …
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NUTRIENT RETENTION BY RIPARIAN FORESTED BUFFERS IN WESTERN MARYLAND: DO THEY WORK AND ARE THEY WORTH IT?
… a BMP, many have also reported a wide range of nutrient reductions. It is uncertain what factors control buffer function, yet they continue to be installed with high expectations. Water quality predictions become less accurate in hydrogeologically complex systems such as the Ridge and Valley …
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Improving performance and expanding application of denitrifying bioreactors for nutrient management in agricultural landscapes
… direct hydrologic pathways that transport excess nutrients from fields to surface waters. As a result, nitrate (NO₃) can bypass natural soil filtration and attenuation processes, contributing to elevated nutrient loads in downstream ecosystems and increasing risks to environmental and human …
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Identification and characterization of odorous metabolites produced by selected freshwater algae
… within the algal cells. Various combinations of nutrient reduction, early algal-bloom within-reservoir treatment, and removal of algal cells prior to oxidation were suggested as likely methods by which odor problems may be reduced.
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Constructed Floodplain Wetland Effectiveness for Stormwater Management
… overbank flows, and 3) quantify the event-scale nutrient assimilative capacity of the constructed wetland. CW water table elevations and hydraulic gradients were measured through an array of nested piezometers. During controlled flooding events, stream water was pumped from the creek and amended …
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Investigation of salinity and nutrient characteristics of two groundwater based flow systems on Virginia's Eastern Shore
… which were periodically sampled for inorganic nutrients and salinity. In the saltmarsh portion of the study site, salinity of monitoring well samples indicated the presence of two horizontal flow systems. The deeper flow system contained freshwater flowing seaward from upland areas. The …
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Green Technologies and Sensor Networks for BMP Evaluation in Stormwater Retention Ponds and Wetlands.
… stormwater Best Management Practices (BMP) for nutrient and erosion reduction and monitoring by incorporation of low impact green technologies and sensor networks. Previous research has found excessive nutrient loading of nitrogen and phosphorus species from urban stormwater runoff can lead to …
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Use of high-rate filamentous algal ponds for primary municipal wastewater treatment
… sp. were identified as target cultivars for nutrient bioremediation of primary municipal wastewater. The identification of target cultivars has previously been based on laboratory conditions, which are insufficient for practical applications. Chapter 3 assessed the biomass productivity and …
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Essays on Water Quality Management for the Chesapeake Bay Watershed
… considered when designing strategies to reduce nutrient runoff from agricultural activities. This dissertation is composed of three chapters that investigate cost-effective ways to mitigate water pollution from agricultural nonpoint pollution sources and explore farmers' incentives when …
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