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Articles 1 - 12 of 12
Full-Text Articles in Environmental Engineering
Assessing The Water Quality Benefits Of Green Infrastructure Stormwater Control Measures., Sam Abdollahian
Assessing The Water Quality Benefits Of Green Infrastructure Stormwater Control Measures., Sam Abdollahian
Electronic Theses and Dissertations
Permeable pavements systems and tree boxes are a common type of Green Infrastructure (GI) Stormwater Control Measures (SCMs) that are often used for mitigating the stormwater runoff. In this study two permeable pavement systems and a tree box installed along parking lanes of an urban street in Louisville, KY, were investigated to evaluate their performance on improving stormwater runoff quality. The water quality monitoring was accomplished by analysis of samples collected from stormwater runoff and the captured stormwater volume at the bottom of the permeable pavements’ sub-base reservoir and by a drain gauge (lysimeter) installed in the tree box. Pollutants …
The Role Of Al And Fe In Controlling Internal P Loading, Lake Auburn, Me, Heather Doolittle
The Role Of Al And Fe In Controlling Internal P Loading, Lake Auburn, Me, Heather Doolittle
Electronic Theses and Dissertations
Lake Auburn, Maine, U.S.A. is a historically oligotrophic lake serving as the primary drinking water source to a population of 40,000. In 2011 and 2012 the local water district observed decreasing water quality, evidenced by increasing epilimnetic total phosphorus (P) concentrations, increasing lake turbidity and the appearance of cyanobacteria. These conditions are especially concerning due to Lake Auburn’s exemption from filtration by the EPA. The decline in water quality has been linked to widespread hypolimnetic summer anoxia, causing internal P loading from the lake sediment. This study evaluated the chemical P speciation in hypolimnetic sediment from Lake Auburn following the …
Trihalomethane Removal And Re-Formation In Spray Aeration Processes Treating Disinfected Groundwater, Cassandra Smith
Trihalomethane Removal And Re-Formation In Spray Aeration Processes Treating Disinfected Groundwater, Cassandra Smith
Electronic Theses and Dissertations
Historically, chlorination has been widely utilized as a primary and secondary disinfectant in municipal water supplies. Although chlorine disinfection is effective in inactivating pathogenic microbes, the use of chlorine creates the unintentional formation of regulated chemicals. On January 4, 2006, the United States Environmental Protection Agency (EPA) promulgated the Stage 2 Disinfectants/Disinfection by-product rule (DBPR) that focuses on public health protection by limiting exposure to four trihalomethanes (THM) and five haloacetic acids (HAA5), formed when chlorine is used for microbial pathogen control. This thesis examines post-aeration TTHM formation when employing spray-aeration processes to remove semi-volatile TTHMs from chlorinated potable water …
Optimization Of Glycerol And Biodiesel Waste Prefermentation To Improve Ebpr, Marzieh Ghasemi
Optimization Of Glycerol And Biodiesel Waste Prefermentation To Improve Ebpr, Marzieh Ghasemi
Electronic Theses and Dissertations
The enhanced biological phosphorus removal (EBPR) process efficiency relies on different operational and process conditions especially the type of carbon source available in the wastewater. Acetic acid and propionic acid are the two major volatile fatty acids (VFAs) found in domestic wastewater which can drive biological phosphorus (P) removal to the desired level. However, often domestic wastewater does not have a sufficient amount of VFAs. Due to high acetate and propionate production-cost, it is not economic to add acetate and propionate directly in full-scale wastewater treatment plants. This brought up the idea of using external carbon sources (e. g. molasses …
Modeling The Impact Of Future Climate On Drainage Infrastructures, Tyler J. Baumbach
Modeling The Impact Of Future Climate On Drainage Infrastructures, Tyler J. Baumbach
Electronic Theses and Dissertations
Research has shown a potential 20% increase in future heavy and extreme precipitation events over the Midwestern States. Drainage infrastructures designed using current design conditions may not be able to convey projected runoffs resulting in flooding and damage to infrastructure. The objective of this paper is to determine the effects of future climate variability on culvert selections in a southwest South Dakota watershed. The scope of the study was defined through a comprehensive literature review. Future climate events were based on a 20% increase in current annual precipitation over the Upper White River Subbasin Watershed. A portion of the White …
Mathematical Modeling Of Carbon Removal In The A-Stage Activated Sludge System, Thomas Nogaj
Mathematical Modeling Of Carbon Removal In The A-Stage Activated Sludge System, Thomas Nogaj
Electronic Theses and Dissertations
This research developed a dynamic activated sludge model (ASM) to better describe the overall removal of organic substrate, quantified as chemical oxygen demand (COD), from A-stage high rate activated sludge (HRAS) systems. This dynamic computer model is based on a modified ASM1 (Henze et al., 2000) model. It was determined early in the project that influent soluble COD, which is normally represented by a single state variable in ASM1, had to be subdivided into two state variables (SBs and SBf, or slow and fast fractions) to simulate the performance of A-stage systems. Also, the addition of state variables differentiating colloidal …
Pathogen Indicator Monitoring In The Ross Barnett Reservoir, Hannie Quay Parker Capps
Pathogen Indicator Monitoring In The Ross Barnett Reservoir, Hannie Quay Parker Capps
Electronic Theses and Dissertations
Man-made reservoirs are often used for both water supply and recreation. The Ross Barnett Reservoir in central Mississippi, a 33,000-acre man-made lake, provides drinking water to the city of Jackson, MS, and forty-eight surrounding communities. Further, an estimated 2.5 million people visit the Reservoir each year for recreational purposes, including boating, fishing, water-skiing, and swimming. Protecting the water quality in the Reservoir is important for these visitors and inhabitants along the shoreline, and for these reasons, the U.S. Environmental Protection Agency has selected it as a Priority Watershed in Mississippi. Presently, there is a concern regarding recent data collected that …
Assessing Biofiltration Pretreatment For Ultrafiltration Membrane Processes, Andrea Cumming
Assessing Biofiltration Pretreatment For Ultrafiltration Membrane Processes, Andrea Cumming
Electronic Theses and Dissertations
An engineered biological filtration (biofiltration) process treating a nutrient-enriched, low-alkalinity, organic-laden surface water downstream of conventional coagulation-clarification and upstream of an ultrafiltration (UF) membrane process was assessed for its treatment effectiveness. The impact of biofiltration pretreatment on UF membrane performance was evaluated holistically by investigating the native source water chemistry and extending the analysis into the drinking water distribution system. The biofiltration process was also compared in treatment performance to two alternative pretreatment technologies, including magnetic ion exchange (MIEX®) and granular activated carbon (GAC) adsorption. The MIEX®, GAC adsorption, and biologically active carbon (BAC) filtration pretreatments were integrated with conventional …
Life-Cycle Greenhouse Gas Emissions And Water Footprint Of Residential Waste Collection And Management Systems, Mousa Maimoun
Life-Cycle Greenhouse Gas Emissions And Water Footprint Of Residential Waste Collection And Management Systems, Mousa Maimoun
Electronic Theses and Dissertations
Three troublesome issues concerning residential curbside collection (RCC) and municipal solid waste (MSW) management systems in the United States motivated this research. First, reliance upon inefficient collection and scheduling procedures negatively affect RCC efficiency, greenhouse gas (GHG) emissions, and cost. Second, the neglected impact of MSW management practices on water resources. Third, the implications of alternative fuels on the environmental and financial performance of waste collection where fuel plays a significant rule. The goal of this study was to select the best RCC program, MSW management practice, and collection fuel. For this study, field data were collected for RCC programs …
An Improved Biosolid Gasifier Model, Hannah Mclean
An Improved Biosolid Gasifier Model, Hannah Mclean
Electronic Theses and Dissertations
As populations increase and cities become denser, the production of waste, both sewage sludge and food biomass, increases exponentially while disposal options for these wastes are limited. Landfills have minimal space for biosolids; countries are now banning ocean disposal methods for fear of the negative environmental impacts. Agricultural application of biosolids cannot keep up with the production rates because of the accumulation of heavy metals in the soils. Gasification can convert biosolids into a renewable energy source that can reduce the amount of waste heading to the landfills and reduce our dependence on fossil fuels. A recently published chemical kinetic …
Ammonia Oxygen Demand Determination For The Design Of An Oxygenation System In A Water Supply Reservoir, Armond Jenkins
Ammonia Oxygen Demand Determination For The Design Of An Oxygenation System In A Water Supply Reservoir, Armond Jenkins
Electronic Theses and Dissertations
The Occoquan Reservoir is a eutrophic reservoir that is part of an indirect potable reuse system. To protect the reservoir water quality, a high quality nitrified product water from a water reclamation facility and an oxygenation system are used during periods of thermal stratification to prevent the onset of anaerobic conditions above the sediments. During the stratified warmest months of the year, oxygen depletion rates exceed nitrate and artificial oxygen supply rates near the dam resulting in ammonia accumulation in the water column. Field observations and laboratory experiments revealed that sediment ammonia release rates ranged from 170-542 mg/m2∙day. …
Color Removal From Pulp Mill Effluent Using Coal Ash Produced From Georgia Power Coal Combustion Plants, Christopher B. Willett
Color Removal From Pulp Mill Effluent Using Coal Ash Produced From Georgia Power Coal Combustion Plants, Christopher B. Willett
Electronic Theses and Dissertations
Two environmental concerns currently face Georgia: coal fly ash (CFA) waste from coal power plants, and the effluent generated by pulp mills. Pulp mill effluent discolors surface waters into which it is discharged, and has been proven to negatively impact the dissolved oxygen and carbon necessary for aquatic life. The proposed solution is a cost-effective adsorption treatment using an inexpensive but abundantly available waste material: CFA. CFA possesses beneficial properties that allow it to effectively remove contaminants, and is available at significantly reduced cost. The primary research objective was to define treatment parameters that would result in the maximum removal …