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Articles 1 - 8 of 8
Full-Text Articles in Engineering
Sustainable Underground Reactive Barrier To Attenuate Contaminants From Agricultural Drainage, Yuchuan Fan
Sustainable Underground Reactive Barrier To Attenuate Contaminants From Agricultural Drainage, Yuchuan Fan
Doctoral Dissertations
Denitrifying bioreactor (DNBR) has become a popular edge-of-field practice applied to reduce nitrate over the Mississippi river and to prevent a downstream hypoxic zone occurring at the Gulf of Mexico. Despite widespread field and laboratory studies, fewer investigations have been directed toward a systematic means of evaluating the nitrate removal performance achieved by various filling materials, abiotic factors, and other critical parameters. Our ultimate goal is to improve the nitrate removal by choosing the optimum fill materials and operate under optimal conditions, meanwhile, modeling the DNBR by critical variables. This study begins by establishing a global database. Forty filling materials …
A Connectivity Framework To Explore The Role Of Anthropogenic Activity And Climate On The Propagation Of Water And Sediment At The Catchment Scale, Christos Giannopoulos
A Connectivity Framework To Explore The Role Of Anthropogenic Activity And Climate On The Propagation Of Water And Sediment At The Catchment Scale, Christos Giannopoulos
Doctoral Dissertations
Anthropogenic disturbance in intensively managed landscapes (IMLs) has dramatically altered critical zone processes, resulting in fundamental changes in material fluxes. Mitigating the negative effects of anthropogenic disturbance and making informed decisions for optimal placement and assessment of best management practices (BMPs) requires fundamental understanding of how different practices affect the connectivity or lack thereof of governing transport processes and resulting material fluxes across different landscape compartments within the hillslope-channel continuum of IMLs. However, there are no models operating at the event timescale that can accurately predict material flux transport from the hillslope to the catchment scale capturing the spatial and …
Metabolomics, Genomics And Transcriptomics Unravel Fluoroalkane Metabolism In Pseudomonas Sp. Strain 273., Yongchao Xie
Metabolomics, Genomics And Transcriptomics Unravel Fluoroalkane Metabolism In Pseudomonas Sp. Strain 273., Yongchao Xie
Doctoral Dissertations
Fluorinated organics have been developed and produced for various applications in the industrial, military, medical and agrochemical fields; they are now emerging as persistent organic pollutants with demonstrated adverse health impacts on mammals, including humans. The high bond dissociation energy of C-F bond hinders microbial degradation and defluorination. The present work demonstrates Pseudomonas sp. strain 273 can utilize the 1-fluoroalkanes (C7 to C10 and C14) and 1,10-difluorodecane (DFD) as the sole carbon source in the presence of oxygen. In this study, fluorine mass balance analysis determined that the majority (> 90%) of the fluorine from the …
Impact And Application Of Real-Time Control On Stormwater Systems, Aaron A. Akin
Impact And Application Of Real-Time Control On Stormwater Systems, Aaron A. Akin
Doctoral Dissertations
Stormwater control measures (SCMs) such as dry extended detention basins and wet ponds are common practices implemented by engineers and designers to mitigate the impact of stormwater runoff. These practices are designed based on historical rainfall data to attenuate runoff to pre-development conditions and, once they are installed, are unable to adapt to changing rainfall patterns or watershed restoration objectives. To solve these climate resiliency issues, several studies were conducted which investigated the impact of retrofitting such systems with a controllable outlet to increase or change detention times during rainfall events along with the novel instrumentation and methodologies necessary for …
Identifying And Assessing Bacterial Contamination In Stormwater Runoff And Receiving Streams, Songyi Liu
Identifying And Assessing Bacterial Contamination In Stormwater Runoff And Receiving Streams, Songyi Liu
Doctoral Dissertations
Stormwater runoff has been recognized as a significant non-point source of pollution responsible for serious ecological impacts. Microbial pollutants represent one of the major contaminants of concern in stormwater runoff and the receiving streams. Traditionally, fecal indicator bacteria (FIB) have been used extensively to assess the microbial quality of water, particularly the extent of fecal contamination in water. However, the application of FIB as indicators of microbial contamination bears known disadvantages of cultivation-dependent techniques, such as the inability to identify the majority of microbial populations that are not amenable to cultivation under laboratory conditions. The effectiveness of a cultivation-independent sequencing …
The Performance Impacts Of Real-Time Control On Bioretention, Padmini P. Persaud
The Performance Impacts Of Real-Time Control On Bioretention, Padmini P. Persaud
Doctoral Dissertations
Bioretention is a green infrastructure practice used to restore natural hydrologic regimes and improve stormwater quality. Extreme weather combined with demands for treatment of a growing number of priority pollutants has put a strain on these systems, making meeting performance goals difficult. The addition of smart stormwater technology has the potential to help address these issues as more control is provided to modify internal conditions and optimize sometimes conflicting outcomes. The use of real-time control is tested in this research to determine how bioretention performance is impacted by this technology. Column studies incorporating forecasts and historic rainfall were used to …
Valorization Of Secondary Agriculture Residues, Narendra Kumar
Valorization Of Secondary Agriculture Residues, Narendra Kumar
Doctoral Dissertations
Secondary agriculture residues have the potential to be major contributors as resources for energy and sustainably sourced materials production. Separating secondary agricultural residues, which have already been transported to processing centers, into individual biomass components could convert these wastes into bioproducts. Many types of pretreatments to achieve this separation involve chemicals that are hazardous for the environment. Several deep eutectic solvents (DES) that are biocompatible have been investigated for their ability to deconstruct rice hulls and sugarcane bagasse. Mass yield, enzymatic hydrolysis of the pretreated biomass, fiber analysis, and Fourier transform infrared spectroscopy have confirmed that the DES formic acid:choline …
Exposure Assessment Of Emerging Contaminants: Rapid Screening And Modeling Of Plant Uptake, Majid Bagheri
Exposure Assessment Of Emerging Contaminants: Rapid Screening And Modeling Of Plant Uptake, Majid Bagheri
Doctoral Dissertations
"With the advent of new chemicals and their increasing uses in every aspect of our life, considerable number of emerging contaminants are introduced to environment yearly. Emerging contaminants in forms of pharmaceuticals, detergents, biosolids, and reclaimed wastewater can cross plant roots and translocate to various parts of the plants. Long-term human exposure to emerging contaminants through food consumption is assumed to be a pathway of interest. Thus, uptake and translocation of emerging contaminants in plants are important for the assessment of health risks associated with human exposure to emerging contaminants. To have a better understanding over fate of emerging contaminants …