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 36 for “"agricultural runoff"”.
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Recovery of Antibiotic Resistance Genes From Agricultural Runoff
… indicator bacteria (FIB), and release of ARGs in runoff over six storm events. Two FIB (Escherichia coli and enterococci) and two ARGs (sulI and ermB) were quantified in runoff from each of the constructed plots throughout the growing season. FIB and ARGs were recovered from all plots, including …
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An Assessment of Floating Treatment Wetlands for Reducing Nutrient Loads from Agricultural Runoff in Coastal Virginia
… documented FTW performance with regard to urban runoff treatment, however evaluation of FTW effectiveness for treatment of agricultural runoff has received less attention. Due to high fertilization and irrigation rates, commercial nursery runoff contains much higher concentrations of N and P than …
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Understanding the role of scale in assessing sediment and nutrient loads from Coastal Plain watersheds delivered to the Chesapeake Bay
Urban and agricultural runoff is the principal contributor to non-point source (NPS) pollution and subsequent impairments of streams, rivers, lakes, and estuaries. Urban and agricultural runoff is a major source of sediment, nitrogen (N) and phosphorus (P) loading to receiving waters. Coastal …
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The Impact of Feed Management Software on Whole-Farm Nutrient Balance on Virginia Dairy Farms
Agricultural runoff is the largest source of nitrogen and phosphorus pollution entering the Chesapeake Bay, contributing 38% of nitrogen and 45% of phosphorus (USEPA, 2010). Since agricultural runoff is the number one contributing source of nitrogen and phosphorus entering the Chesapeake Bay, …
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Southeast Michigan wastewater treatment plants as potential sources of microplastic pollution in the Rouge River and Huron River
… waterways from a variety of sources, such as agricultural runoff, anthropogenic litter, and wastewater treatment plants (WWTPs). To determine whether WWTPs are a source of microplastics to the Lower Rouge and Huron Rivers, we measured microplastic load upstream and downstream of two Southeast …
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Measuring Bioavailable Copper in Estuarine Waters using an Ion Exchange Resin
… strongly bound copper in estuarine waters and agricultural drainage. Copper bound to an ion exchange resin has been operationally defined as bioavailable copper, or copper that is available for uptake by aquatic organisms. Initial laboratory testing indicated that the percent of copper bound to …
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Impact of Substrate on Nutrient Removal in In-Ditch Bioreactors
… or grassed waterways, collect nutrient-laden runoff from agricultural fields and transport it to nearby waterbodies. The high nitrogen and phosphorus content in this water leads to negative effects, such as eutrophication in the receiving waters. In-ditch bioreactors are a simple, inexpensive …
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Water Quality Impacts from Agricultural Land-Use in the Karst Groundwater Basin of Qingmuguan, Chongqing, China
… differences in pesticide concentrations between agricultural and residential areas hydrologically linked by karst conduits. In late 2007 the fluvial connections in a simple karst system near Chongqing were confirmed using dye tracing techniques. Once these connections were established and the …
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A study of an integrated management initiative to improve the Berg River, Western Cape, South Africa
… environmental stress due to polluted urban runoff, wastewater effluent discharges, agricultural runoff and the presence of alien invasive flora. The Management and Transition Framework (MTF) is adopted in this study as the framework that underpins the structured analysis of the Berg River …
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Availability and Surface Runoff of Phosphorus from Compost Amended Mid-Atlantic Soils
… manure increases the risk for P enrichment of agricultural runoff. Transport of these residuals to areas where P may be efficiently utilized is necessary to reduce the threat to water quality. Composting can improve biosolids and manure handling characteristics to make their transportation more …
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The Missoula Poplar Project: Utilizing Poplars to Enhance Wastewater Treatment
Wastewater treatment plants rank second to agricultural runoff in the top ten major pollution sources to U.S. surface waters. Such nutrient-rich inputs can degrade aquatic ecosystems by accelerating eutrophication events, especially in summer months when surface water flows are low. Alternative …
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The Missoula Poplar Project: Utilizing Poplars to Enhance Wastewater Treatment
Wastewater treatment plants rank second to agricultural runoff in the top ten major pollution sources to U.S. surface waters. Such nutrient-rich inputs can degrade aquatic ecosystems by accelerating eutrophication events, especially in summer months when surface water flows are low. Alternative …
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Development of Fungal Bioreactors for Water Related Treatment and Disinfection Applications
Wastewater, recycled irrigation water, and agricultural runoff can contain high levels of pathogenic bacteria, which pose a threat to human and ecosystem health. The use of a bioreactor containing mycelial mats of filamentous fungi is a novel treatment technology that incorporates physical, …
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Control of agricultural nonpoint source pollution in Kranji Catchment, Singapore
… both of which can be directly traced to agricultural runoff. Water quality samples were collected along the main drainage channel in the Neo Tiew subcatchment, which drains to Kranji Reservoir, in an effort to determine the source and degree of agricultural nonpoint source pollution in …
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Multifunctional experimental assessment in a newly established Mediterranean restored marsh : marsh elevation, carbon accumulation and pollutant concentration reduction
… plain flooding risk. Traditional and current agricultural practices have transformed large areas of marshes and lagoons into rice fields, now occupying up to 60% of the deltaic plain. Agricultural runoff carries substantial loads of pesticide and fertilizer to natural habitats. To reduce …
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Phosphorus Retention and Fractionation in Masonry Sand and Light Weight Expanded Shale Used as Substrate in a Subsurface Flow Wetland
… as stormwater wetlands and wetlands for treating agricultural runoff.
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Between a bass and a hard place: the fragmented distribution of an endangered redfin in the Heuningnes River System of the Cape Fold Ecoregion
… that they are affected by pollution from agricultural runoff. Moving forward, conservation practitioners should consider non-native eradication projects, through either chemical or mechanical removal. Additionally, they should also consider creating a buffer of indigenous vegetation, which …
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The lethal and sublethal effects of aldicarb on the estuarine grass shrimp, Palaemonetes pugio
… drainage basins for various pollutants such as agricultural runoff. The estuarine grass shrimp, Palaemonetes pugio, has been shown to be a sensitive indicator of pesticide exposure. In this study, emphasis was placed on the quantification of the lethal and sublethal effects of aldicarb on three …
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The effects of a toxic metals spill on aquatic fauna in streams near Culpeper, Virginia
… sites were influenced by various factors (agricultural runoff, road runoff, silt, heavy metal pollution, possible chemical pollution). Unfortunately, it was difficult to distinguish which effects were caused by heavy metal or chemical contaminants. Consequently, the results of the community …
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