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Full-Text Articles in Engineering

Fouling And Aging In Membrane Filtration : Hybrid Afm-Based Characterization, Modelling And Reactive Membrane Design, Wanyi Fu May 2019

Fouling And Aging In Membrane Filtration : Hybrid Afm-Based Characterization, Modelling And Reactive Membrane Design, Wanyi Fu

Dissertations

Membrane filtration has been extensively used in water and wastewater treatment, desalination, dairy making, and biomass/water separation. However, membrane fouling, aging and insufficient removal efficiency for dissolved organic matters remain major challenges for wider industrial applications. In order to tackle these challenges, this doctoral dissertation investigates mechanisms of membrane fouling and development of antifouling membrane filtration technologies. Specifically, four major research areas are explored: (i) nanoscale physicochemical characterization of the chemically modified polymeric membranes; (ii) quantitative modelling between membrane properties and membrane fouling and defouling kinetics; (iii) development of quantitative structure-activity relationships for membranes that undergo thermal and chemical ...


Effects Of Ozonation During Ceramic Microfiltration Of Water Containing Natural Organic Matter, Evan Martin Owen Jan 2019

Effects Of Ozonation During Ceramic Microfiltration Of Water Containing Natural Organic Matter, Evan Martin Owen

Civil Engineering Graduate Theses & Dissertations

The application of low-pressure membrane filtration such as microfiltration (MF) and ultrafiltration (UF) have become progressively well-established in the drinking and wastewater technology industry over the past few decades. While polymeric membranes dominate this sector of the water industry, ceramic membranes have become an increasingly popular and advantageous alternative to polymeric materials. Most importantly, ceramic membranes can be effectively employed to treat high-fouling impaired quality source water because of the inherent material robustness, that can withstand in-situ oxidative cleaning regimes.

Given the ozone (O3)-resistant nature of ceramic membranes, this research demonstrated that preozonation plays a crucial role in both ...


Hydraulic Fracturing Fluid Additives: Method For Detection With Mass Spectrometry, New Identifications, And Utility Of Biological Treatment, Kurban Andrew Sitterley Jan 2019

Hydraulic Fracturing Fluid Additives: Method For Detection With Mass Spectrometry, New Identifications, And Utility Of Biological Treatment, Kurban Andrew Sitterley

Civil Engineering Graduate Theses & Dissertations

Hydraulic fracturing simultaneously uses and generates billions of gallons of water every year that must be sourced and managed. Fracturing fluid chemicals, including many ethoxylated and propoxylated surfactants, are added to water to make fracturing fluid. Flowback and produced water, the primary contributors to the waste stream, are generated during the drilling operations and throughout the life of the well.

Inherent to developing a management approach is adequate methods of characterization and treatment for dissolved components. This research presents the development of a solid phase extraction method for identifying and detecting common fluid additives with mass spectrometry (MS). With this ...