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Articles 1 - 9 of 9
Full-Text Articles in Environmental Engineering
Concentrated Wastewater Treatment Using A Ferric Iron-Dosed Anaerobic Upflow Sludge Blanket Reactor For Recovery Of Phosphorus And Ammonium, Carley E. Shingleton
Concentrated Wastewater Treatment Using A Ferric Iron-Dosed Anaerobic Upflow Sludge Blanket Reactor For Recovery Of Phosphorus And Ammonium, Carley E. Shingleton
Graduate Theses, Dissertations, and Problem Reports
This study evaluated the performance of a novel, ferric iron-dosed anaerobic bioreactor to recover two separate nutrient products from concentrated wastewaters -- phosphorus as vivianite (Fe3(PO4)2×8H2O) and an ammonium-containing effluent with low organics. A bench-scale upflow anaerobic sludge blanket (UASB) reactor fed with a synthetic wastewater (458.0 mg/L total organic carbon, 282.7 mg/L ammonium, and 84.4 mg/L phosphate) was dosed with a ferric chloride solution at an org. C/Fe3+ molar ratio ~17.5 to facilitate organic carbon oxidation coupled to iron reduction. The reactor design allowed natural settling of vivianite to its …
Climatic And Land Cover Sensitivities Of Stormwater Runoff In A Coastal Natural-Urban Basin Of Texas, Usa., Nusrat Nasrin Khan
Climatic And Land Cover Sensitivities Of Stormwater Runoff In A Coastal Natural-Urban Basin Of Texas, Usa., Nusrat Nasrin Khan
Graduate Theses, Dissertations, and Problem Reports
Changes in climatic and land use drivers typically drive stormwater runoff quantity and quality. This study focuses on determining the stormwater runoff sensitivities to variation in climatic and land cover changes in a coastal natural-urban basin. A mechanistic hydrologic model was developed for the Spring San Jacinto Basin (SSJB) of Texas, USA considering the basin as a pilot study area by using the U.S. Environmental Protection Agency (EPA)’s Storm Water Management Model 5.2. The SSJB drains an area of 1949 km2 ultimately into the northern Gulf of Mexico, USA through peripheral neighborhoods of the Greater Houston area. The model …
Stormwater Runoff Response Under Changing Climate And Land Uses Across Gradients Of Inland And Coastal Urban-Natural Basin, Mahmood Khan
Stormwater Runoff Response Under Changing Climate And Land Uses Across Gradients Of Inland And Coastal Urban-Natural Basin, Mahmood Khan
Graduate Theses, Dissertations, and Problem Reports
Climatic variability has caused significant shifts in the magnitude, frequency and spatiotemporal distribution of precipitation, generating excessive runoff that leads to frequent occurrences of extreme hydrologic events such as the pluvial (rainfall accumulation) and fluvial (riverine) floods. The conversion of natural areas into urban lands is further exacerbating the rainfall accumulation by increasing surface imperviousness that hinders infiltration of water into the soil. This dissertation predicts and characterizes potential shifts in the future annual stormwater runoff
volumes and runoff extremes under the standalone and coupled changes in climate and land use across inland and coastal urban-natural settings. The research was …
Stormwater Sensitivities To The Climatic And Land Cover Drivers In A Heavily Urbanized Coastal Basin Along The Northern Gulf Of Mexico, Usa., Md Faisal Razy
Stormwater Sensitivities To The Climatic And Land Cover Drivers In A Heavily Urbanized Coastal Basin Along The Northern Gulf Of Mexico, Usa., Md Faisal Razy
Graduate Theses, Dissertations, and Problem Reports
Stormwater runoff response in a complex coastal-urban basin varies with the changes in climatic and land cover drivers. This thesis aims to assess the runoff responses to variation in climatic and land cover variables and perform a sensitivity analysis in complex coastal-urban basins. The Buffalo San Jacinto Basin (BUSJ) of southeast Texas, USA was considered a pilot study area for this research. BUSJ is a heavily urbanized coastal basin, draining an area of 3132 km2 through the City of Houston, Texas into the northern Gulf of Mexico, USA. A process-based hydrological model was developed with fine spatio-temporal resolutions for …
Effects Of Changes In Land Use Land Cover And Climate On Long-Term Total Dissolved Solids Trends In The Mid-Atlantic Region Of The United States, Melaine Edouard Kolimedje
Effects Of Changes In Land Use Land Cover And Climate On Long-Term Total Dissolved Solids Trends In The Mid-Atlantic Region Of The United States, Melaine Edouard Kolimedje
Graduate Theses, Dissertations, and Problem Reports
The Mid-Atlantic region (MAR) of the U.S. is subjected to a variety of stressors that affect the headwaters of the major rivers. Some of these stressors are abandoned mine drainage, agriculture, municipal point sources, urban areas, out-of-basin diversions, competing water uses, rapid population growths in the lowlands, alterations in water availability due to climate change and habitat alteration. In addition to these regional stressors, the rapid population growths and energy sources shifting have resulted in changes in land use and land cover (LULC) over the last few decades. The interactive effects of LULC and interannual/long-term climate changes have resulted in …
Selective Precipitation And Recovery Of Rare Earth Elements From Acid Mine Drainage, Robyn Lauren Christoferson
Selective Precipitation And Recovery Of Rare Earth Elements From Acid Mine Drainage, Robyn Lauren Christoferson
Graduate Theses, Dissertations, and Problem Reports
The ability to secure rare earth elements (REEs) in the United States is of concern due to the rapid growth in demand and the monopolistic supply chain. The demand for REEs has skyrocketed in recent years due to the development of many green technologies. The United States and many other countries are currently reliant on China for REEs, who currently control greater than 90% of the global supply. Due to the severe impact of previous Chinese export quotas, it is important to lessen the reliance on importation and explore methods of recycling REEs from secondary sources. A secondary REE source …
Minimizing Trihalomethane Formation Through Source Water Monitoring And Optimizing Treatment Practices, Nashid Mirza
Minimizing Trihalomethane Formation Through Source Water Monitoring And Optimizing Treatment Practices, Nashid Mirza
Graduate Theses, Dissertations, and Problem Reports
Trihalomethanes, a family of halogenated disinfection byproducts, are prevalent in finished drinking water. According to USEPA’s Disinfectants and Disinfection Byproducts Rules (DBPRs), the regulatory standard of the total trihalomethanes (TTHMs) is 80 μg/L, and water treatment plant operators are required to closely monitor TTHMs in the finished water on a quarterly basis. Although total organic carbon (TOC) has been identified as a precursor for the TTHMs, knowledge gaps still exist in how specific water and treatment related factors (e.g., intake water quality, seasonal variation, contact time, and treatment train) affect TTHMs formation. Focusing on water treatment plants in southwestern Pennsylvania, …
Remotely Sensed Hydroclimatic Variability For Water Security In An Agricultural Basin, Ashish Kondal
Remotely Sensed Hydroclimatic Variability For Water Security In An Agricultural Basin, Ashish Kondal
Graduate Theses, Dissertations, and Problem Reports
The Indus Basin has supported agricultural practices since the Harappan civilization (3000-1500 BC). Abundance of water has always supported agriculture in the region and built the Indus Basin as one of the major agriculture based economies of the world. The obvious dependency of agriculture on weather and the vagaries of climate emphasizes the necessity of a comprehensive hydro-climate study of the region. The role of climate change in the Indus Basin has always been a contentious issue. Groundwater depletion is evident in the region, and its steady and alarmingly declining rate has brought concerns for the future of agriculture in …
Geotechnical Laboratory Testing For 2-D Fem Analysis Of Geomorphic And Planar Sloped Caps And Covers For Sustainable Mine Refuse Deposition, Sun Hee Park
Graduate Theses, Dissertations, and Problem Reports
This thesis reports the findings of the application of Geomorphic Landform Design principles to the Royal Scot abandoned coarse coal refuse (CCR) pile located in Greenbrier County, West Virginia. The Royal Scot facility has many environmental concerns including severe erosion, acid-mine/rock drainage, and sediment transport. A cap and cover system is proposed to be implemented which incorporates the GLD principles. A two-layer cap and cover system will be used to reclaim the site and return it back to a stable state and reduce the production of acid-mine drainage. The system is composed of a hydraulic barrier composed of compacted CCR, …