Open Access. Powered by Scholars. Published by Universities.®
- Institution
Articles 1 - 5 of 5
Full-Text Articles in Engineering
Controls On Phosphorus Export From An Agricultural Watershed: Amsden Brook, Fort Fairfield, Maine Usa., Gregory J. Mcdonald
Controls On Phosphorus Export From An Agricultural Watershed: Amsden Brook, Fort Fairfield, Maine Usa., Gregory J. Mcdonald
Electronic Theses and Dissertations
This study explores the sources and mechanisms of phosphorus (P) mobilization during base flow within the Amsden Brook watershed, Fort Fairfield, Maine, USA. Amsden Brook is an agriculturally dominated watershed drained by a spring-fed and perennial first- to second-order stream. We characterized the P concentrations within the watershed to investigate connections between soils, stream sediment, surface water, and groundwater. Waters were monitored monthly during the 2017 snow-free period for temperature, pH, dissolved oxygen, conductivity, soluble reactive P (SRP), total P, strong acid anions, strong base cations, dissolved organic carbon (DOC), Al, Fe, and Mn. Phosphorus speciation within soils and sediment …
The Impact Of Phosphorous Species On Dewaterability Of Wastewater Solids, Erik Anderson
The Impact Of Phosphorous Species On Dewaterability Of Wastewater Solids, Erik Anderson
Master's Theses (2009 -)
Phosphorus regulations are causing Water Resource Recovery Facilities (WRRFs) to implement new technologies to remove phosphorus (P) before they discharge liquid effluent. Enhanced Biological Phosphorus Removal (EBPR) is often employed to remove P from water. However, sludges from EBPR plants have shown decreases in dewaterability soon after EBPR was initiated. This decline in dewaterability is not well understood, nor is the best way to improve the dewatering EBPR sludge. Specifically, the role of different P species on sludge dewaterability is not well understood. Several laboratory experiments were conducted at the Marquette University Water Quality Center with the following objectives: i) …
Measuring And Calculating Current Atmospheric Phosphorous And Nitrogen Loadings On Utah Lake Using Field Samples, Laboratory Methods, And Statistical Analysis: Implication For Water Quality Issues, Jacob Milton Olsen
Theses and Dissertations
Atmospheric nutrient loading and transport though precipitation and dry deposition is one of the least understood yet one of the most important pathways of nutrient transport into many lakes. These nutrients, phosphorus and nitrogen, are essential for aquatic life and often play major roles in algae blooms that occur in lakes and reservoirs. Often heavy algal growth intensifies a variety of water quality problems. Utah Lake may be even more susceptible to atmospheric deposition due to its large surface area to volume ratio and proximity to Great Basin dust sources. In this study, eight months of atmospheric deposition data were …
Hydrology And Phosphorus Model For Agricultural Watershed: Swat Simulation Of Discharge And Nutrient Flux In The Medway Creek Watershed, Omar El Abusanina
Hydrology And Phosphorus Model For Agricultural Watershed: Swat Simulation Of Discharge And Nutrient Flux In The Medway Creek Watershed, Omar El Abusanina
Electronic Thesis and Dissertation Repository
High nutrient concentrations in surface water have been a serious concern that impacts water quality and ecology. High Phosphorus levels in Medway Creek indicate the presence of a pollution source in the watershed that needs to be identified and quantified. To investigate this issue, the Soil and Water Assessment Tool (SWAT) program has been used in this study with the Geographic Information System (GIS) to model the Medway Creek watershed and assess stream flow and nutrient flux. In this research, the SWAT model has been built, calibrated, and validated using two independent observed data sets to evaluate the SWAT efficiency …
Modeling Canopy Effect In The Great Lakes Cladophora Model, Ankita Bakshi
Modeling Canopy Effect In The Great Lakes Cladophora Model, Ankita Bakshi
Dissertations, Master's Theses and Master's Reports
Cladophora glomerata is a filamentous green alga native to the Great Lakes. However, its nuisance growth in phosphorus rich waters negatively affects the lakes’ aesthetic and water quality. The Great Lakes Cladophora Model (GLCM) v1, developed in 1982, was the first mechanistic model to simulate Cladophora growth basing phosphorus availability and environmental conditions followed by Cladophora Growth Model and GLCM v2. In this study, the light and temperature mediation factors for Cladophora net growth are revised as a necessary step prior to the development of a self-shading algorithm. The concept of a fixed-value, maximum achievable biomass (carrying capacity) employed in …