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Articles 1 - 9 of 9
Full-Text Articles in Engineering
Investigating The Role Of Iron In The Photogranulation Phenomenon, Abeera Ayaz Ansari
Investigating The Role Of Iron In The Photogranulation Phenomenon, Abeera Ayaz Ansari
Doctoral Dissertations
Oxygenic photogranules (OPGs) are dense spherical microbial aggregates that are used for self-aerating wastewater treatment. Filamentous cyanobacteria are key granulating species, providing structural backbone and integrity in OPGs. Currently, the mechanisms for selecting filamentous cyanobacteria and their ability to form spherical OPGs are not well understood. Literature shows that iron (Fe) availability plays a significant role in the cyanobacterial growth and colony formation. Moreover, Fe availability is known to be dependent upon light, which is an essential growth substrate for the phototrophs. This research has investigated the role of Fe in the photogranulation phenomenon and the impact of light intensity …
Scaling Up The Oxygenic Photogranule (Opg) Wastewater Treatment Process, Joseph G. Gitau
Scaling Up The Oxygenic Photogranule (Opg) Wastewater Treatment Process, Joseph G. Gitau
Doctoral Dissertations
Photogranular biomass has yet to be utilized at large scale for wastewater treatment despite their potential to lower energy demand due to self-aerating capacity in addition to better process control compared to conventional technologies. An evaluation of critical driving factors affecting scaling up has yet to be undertaken. The current generation of oxygenic photogranules under hydrostatic conditions (a deviation from orthodox conditions creating other granules) limit seeding of larger reactors in time and scale. In addition, evaluating the photosynthetic productivity of granules which exist as closely commingled consortia with tightly coupled production and consumption processes, has yet to be undertaken. …
Modeling Of Electrical Grid Systems To Evaluate Sustainable Electricity Generation In Pakistan, Muhammad Mustafa Amjad
Modeling Of Electrical Grid Systems To Evaluate Sustainable Electricity Generation In Pakistan, Muhammad Mustafa Amjad
Masters Theses
Pakistan has always had a history of severe energy shortfalls, which rose up to an alarming 33% in 2013. This situation was countered by investments in the energy sector through the China Pakistan Economic Corridor (CPEC), which were unfortunately largely based on brown fuels. Although beneficial in the short term, these investments do not bode well for the climate scenario of Pakistan, with various parts of the country already having experienced temperatures rise of 1-3°C. To ensure that the current situation doesn’t exacerbate and is tackled in a timely manner, this research aims to examine how the untapped potential of …
A Framework For Meeting Economic And Ecological Objectives In Hydropower Operations, Sarah L. Pfeifle
A Framework For Meeting Economic And Ecological Objectives In Hydropower Operations, Sarah L. Pfeifle
Environmental & Water Resources Engineering Masters Projects
Hydropower is a low carbon energy source that provides reliable power, but imposes large, artificial sub-daily changes in flow that negatively impact ecological systems. Hydropower management faces the challenge of meeting economic and ecological objectives, neither of which can be fully optimized because of their Pareto nature. This study introduces an operational framework, called seasonal flexibility, as tool that aims to meet both sets of objectives. Economic objectives are met by allowing releases to deviate from inflows to generate power when it is most valuable. Ecological objectives are met by dynamically managing environmental flows to mitigate downstream impacts. Flexibility is …
Analysis Of Road Salt Loading And Transport In The Wachusett Reservoir Watershed, Joshua Soper
Analysis Of Road Salt Loading And Transport In The Wachusett Reservoir Watershed, Joshua Soper
Environmental & Water Resources Engineering Masters Projects
Chloride exports from the widespread application of road salt serve as a primary contribution to water body salinity in cold climate regions. The detrimental effects of road salt pollution on water quality include an apparent relationship between chloride and water corrosivity. This study utilizes regression based chloride load estimation to support mass balances and analyze transport flow-paths to the Wachusett Reservoir from its predominantly rural watershed. Results from hydrograph and load separation techniques show that average loading and discharge from baseflow contributed approximately 74% and 65% of the total loading and discharge, respectively. The baseflow dominated tributary chloride loading is …
Optimizing Household Water Decisions For Managing Intermittent Water Supply In Mexico City, Savannah Wunderlich
Optimizing Household Water Decisions For Managing Intermittent Water Supply In Mexico City, Savannah Wunderlich
Environmental & Water Resources Engineering Masters Projects
Nearly 1 billion people around the world experience intermittent water supply (IWS), including about 70% of residents in the Mexico City area. Households with IWS often rely on multiple sources of water to meet their needs, including municipal piped water, trucked water, and rainwater. When calculating water costs and reliability of supply, models of these systems must account for household decision-making regarding the volume of water to use from each different source each day. Modeling these household decisions (or “control policies”) is challenging, especially when households use rainwater as a water source, due to the complexity of the input variables …
3d Printed Architected Materials For Improving Biofilm Carriers For Wastewater Treatment Applications, Bryan Ovelheiro
3d Printed Architected Materials For Improving Biofilm Carriers For Wastewater Treatment Applications, Bryan Ovelheiro
Environmental & Water Resources Engineering Masters Projects
Wastewater infrastructure in the United States has been in dire need of improvement for quite a while. It was estimated that wastewater treatment systems would need about $57.2 billion to maintain acceptable levels of treatment in the coming years (Christen, 2003). This is just for maintaining the treatment systems in place, without any room for improvement, and it only accounts for about 31.6% of the total waster infrastructure need in this area (Christen, 2003). In fact, without sufficient upgrades, water quality gains achieved through the passing of the Clean Water and Safe Drinking Water acts could be lost (Christen, 2003). …
Complexities Of Attraction Water Systems: A Review & An Experiment Showcasing Their Effects, Marcia Rojas
Complexities Of Attraction Water Systems: A Review & An Experiment Showcasing Their Effects, Marcia Rojas
Environmental & Water Resources Engineering Masters Projects
The presence of dams has direct negative effects on populations of migrating fish and their riverine habitat as well as impacts on the ecosystem services they provide. Fishways, provide upstream and downstream passage that is safe and timely, comprising specifically of “physical structures, facilities, or devices necessary to maintain all life stages of such fish, and project operations and measures related to such structures, facilities, or devices which are necessary to ensure the effectiveness of such structures, facilities or devices for such fish” (National Energy Policy Act 1992). Fishways, sloped channels or elevators that connect the tailrace to the head …
Hudson River Estuary Tidal Marsh Sediment Data, Brian Yellen, Jonathan Woodruff
Hudson River Estuary Tidal Marsh Sediment Data, Brian Yellen, Jonathan Woodruff
Data and Datasets
This repository contains data from sediment cores collected at six tidal wetland complexes that are located within the Hudson River Estuary. The sites include Stockport Marsh, Esopus Delta, Tivoli North Bay, Tivoli South Bay, Vanderburgh Cove, and Iona Island Marsh. A variety of core collection tools and methods were used to collect uncompacted records, including gouge coring, Russian peat coring, and piston push coring, with the method determined by coring environment. The general workflow for cores included (1) splitting; (2) Itrax XRF scanning; (3) subsampling cores ~10 cm spacing; (4) drying and burning samples for percent water, organic, and mineral …