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Full-Text Articles in Environmental Engineering
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 …
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 …
Methods For Estimating Sediment Yield And Dam Capacity In The Great Lakes Watershed, Jennifer Hui
Methods For Estimating Sediment Yield And Dam Capacity In The Great Lakes Watershed, Jennifer Hui
Wayne State University Theses
Sedimentation is the most important factor in the longevity of dams built in the United States. As most dams are reaching their capacity for sediment storage, this study investigated the historical and predicted future rates of sediment accumulation as well as the remaining storage capacity. This study examined the mechanisms influencing sediment production and storage in the watershed to provide future insight regarding potential control of this process. Twelve reservoirs throughout the Great Lakes watershed were selected and analyzed for their greater applicability to the entire watershed. Both historic and new data were collected on these dams to determine how …