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Articles 1 - 7 of 7
Full-Text Articles in Environmental Engineering
Integrated Strategies For Sustainable Wastewater-Based Algal Biofuel Production And Environmental Mitigation In The Us, Javad Roostaei
Integrated Strategies For Sustainable Wastewater-Based Algal Biofuel Production And Environmental Mitigation In The Us, Javad Roostaei
Wayne State University Dissertations
Integration of algae cultivation with wastewater treatment has received increasing interest as a cost-effective strategy for biofuel production. However, there has been no full assessment of algal biofuel production with wastewater on macro-scale by taking into account wastewater resources, land availability, CO2 emission resources, and geographic variation. This research addressed and evaluated the use of wastewater for algae cultivation, in terms of modeling and laboratory experiments. The first goal of this research was to develop a spatially explicit lifecycle model, by integrating life cycle assessment (LCA), and Geographic Information Systems (GIS) analysis, for the evaluation of the environmental and economic …
Analysis Of Micromixers To Minimize Scaling Effects On Reverse Osmosis Membranes, Jeremy Walker
Analysis Of Micromixers To Minimize Scaling Effects On Reverse Osmosis Membranes, Jeremy Walker
Wayne State University Dissertations
ABSTRACT
ANALYSIS OF MICROMIXERS TO MINIMIZE SCALING EFFECTS ON REVERSE OSMOSIS MEMBRANES
by
Jeremy Walker
December 2018
Advisor: Dr. Shawn McElmurry
Major: Civil Engineering
Degree: Doctor of Philosophy
Structural elements, typically mesh spacers, are required between membrane leaves in spiral
wound elements to ensure flow through reverse osmosis (RO) modules. The standard diamond-shaped
mesh spacer results in non-ideal hydrodynamics that can lead to fouling, which ultimately reduces the
flux of water through the membrane and the operational life of the unit. Additionally, traditional mesh
feed spacers do not allow for reverse flow cleaning due to obstructed flow paths and, once …
Evaluating Sediment Accumulation Behind Dams In The Great Lakes Watershed From Past To Present, Fatemeh Alighalehbabakhani Alighalehbabakhani
Evaluating Sediment Accumulation Behind Dams In The Great Lakes Watershed From Past To Present, Fatemeh Alighalehbabakhani Alighalehbabakhani
Wayne State University Dissertations
Reservoir sedimentation and the consequence long term loss of storage capacity have been a serious threat to the natural environmental system. However, there is only few information and physical measurements regarding to the sediment accumulation rate within the reservoirs. The average age of dams in the country is more than 50 years old, and with aging dams, the number of high-hazard dams continues to increase. There are some serious risks associated with aging dams. Dam removal or dam failure can release considerable sediment load to downstream reaches, eventually deteriorate water quality and fish habitat. The present dissertation investigates the historical …
Novel Approaches For Assessment Of Copper Toxicity: Fast Scan Cyclic Voltammetry And Optical Bioassays, Annette R. Tremonti
Novel Approaches For Assessment Of Copper Toxicity: Fast Scan Cyclic Voltammetry And Optical Bioassays, Annette R. Tremonti
Wayne State University Dissertations
Anthropogenic activities negatively impact fresh water ecosystems through toxic contaminants that are released into the environment. Copper (Cu) is a water contaminant that is fundamentally persistent once introduced into the environment that has the potential for bioaccumulation. Although Cu toxicity has been studied for decades, there is still a continuing problem with new sources and pathways. New approaches are needed to understand distribution and transport of Cu and its potential for complex biological impacts beyond the simple assessment of lethality. Several novel approaches were used in this research project to advance our understanding of Cu toxicity, including fast scan cyclic …
Enhanced Pump Schedule Optimization For Large Water Distribution Networks To Maximize Environmental And Economic Benefits, Seyed Mohsen Sadatiyan Abkenar
Enhanced Pump Schedule Optimization For Large Water Distribution Networks To Maximize Environmental And Economic Benefits, Seyed Mohsen Sadatiyan Abkenar
Wayne State University Dissertations
For more than four decades researchers tried to develop optimization method and tools to reduce electricity consumption of pump stations of water distribution systems. Based on this ongoing research trend, about a decade ago, some commercial pump operation optimization software introduced to the market. Using metaheuristic and evolutionary techniques (e.g. Genetic Algorithm) make some commercial and research tools able to optimize the electricity cost of small water distribution systems (WDS). Still reducing the environmental footprint of these systems and dealing with large and complicated water distribution system is a challenge.
In this study, we aimed to develop a multiobjective optimization …
The Energy Trilogy: An Integrated Sustainability Model To Bridge Wastewater Treatment Plant Energy And Emissions Gaps, A. Adhim A. Altalibi
The Energy Trilogy: An Integrated Sustainability Model To Bridge Wastewater Treatment Plant Energy And Emissions Gaps, A. Adhim A. Altalibi
Wayne State University Dissertations
ABSTRACT
An estimated 4% of national energy consumption is used for drinking water and wastewater services. Despite the awareness and optimization initiatives for energy conservation, energy consumption is on the rise owing to population and urbanization expansion and to commercial and industrial business advancement. The principal concern is since energy consumption grows, the higher will be the energy production demand, leading to an increase in CO2 footprints and the contribution to global warming potential.
This research is in the area of energy-water nexus, focusing on wastewater treatment plant (WWTP) energy trilogy - the group of three related entities, which includes …
Evaluating Chemical Toxicity: A Novel Behavioral Assay Using Daphnia, Maya A. Zein
Evaluating Chemical Toxicity: A Novel Behavioral Assay Using Daphnia, Maya A. Zein
Wayne State University Dissertations
Pharmaceuticals, and personal care products (PPCPs), and other emerging contaminants, such as pesticides, are increasingly being detected in the environment. Important sources of these contaminants are waste water treatment plants and agriculture. Many of these contaminants are biologically active at low concentrations, and may impair physiological processes in exposed organisms, alter reproductive, endocrine or immune system function, and ultimately affect fitness and survival. These chemicals are often found in the environment as complex mixtures, and this complicates their evaluation of their toxicity. There is a need for high-throughput assays to rapidly assess the toxicity of these emerging contaminants. A behavioral …