Open Access. Powered by Scholars. Published by Universities.®

Engineering Commons

Open Access. Powered by Scholars. Published by Universities.®

Articles 1 - 4 of 4

Full-Text Articles in Engineering

Characterization Of Cryptosporidium Parvum Oocyst Attachment To Environmental Biofilm Surface, Xia Luo Jan 2015

Characterization Of Cryptosporidium Parvum Oocyst Attachment To Environmental Biofilm Surface, Xia Luo

Theses and Dissertations

Biofilms are communities of microorganisms that form on a solid surface. It has been shown previously that Cryptosporidium parvum is able to accumulate and survive in association with bacterial biofilms in aquatic environments. The long-term survival and sudden release of pathogenic microorganisms due to biofilm sloughing may lead to waterborne disease transmission. The fact that biofilms can immobilize C. parvum oocysts from the water column poses fundamental questions regarding interactions of oocysts with biofilm surfaces. Consequently, the main objectives of this study were to: 1) investigate the mechanisms that govern C. parvum oocyst attachment to environmental biofilms; 2) examine the ...


Characterizing The Hydrophobic Properties Of Activated Carbon And The Factors Affecting Voc Adsorption, Steven Michael Sheets Jan 2015

Characterizing The Hydrophobic Properties Of Activated Carbon And The Factors Affecting Voc Adsorption, Steven Michael Sheets

Theses and Dissertations

Regeneration is vital to the life cycle of adsorbents such as activated carbon. Regeneration losses, in the forms of adsorbent mass and adsorption capacity, have long plagued the life-cycle of conventional adsorbents. Adsorption losses are compounded by the presence of moisture in exhaust gas streams during VOC treatment, due to the competition for adsorbent sites between water and VOCs. Since water vapor often out-competes the VOCs for these sites, the carbon’s loss of adsorption capacity can be attributed to water’s affinity to the carbon surface. The present research explores the hypothesis that selective organic phase adsorbents can be ...


Effects Of Surface Properties On The Charge Regulated Bioenergetic Response Of Attached Bacteria: Exploration Within The Framework Of The Chemiosmotic Theory, Lynal Sunila Albert Jan 2015

Effects Of Surface Properties On The Charge Regulated Bioenergetic Response Of Attached Bacteria: Exploration Within The Framework Of The Chemiosmotic Theory, Lynal Sunila Albert

Theses and Dissertations

Microbial adhesion is critical to natural and engineered systems due to the ubiquitous presence of bacteria, their tendency to attach to biotic and abiotic surfaces and their ability to survive in habitats not suitable for most life. Many processes benefit from microbial adhesion, such as attached-growth wastewater treatment and symbiotic nitrogen fixation. In other scenarios, microbial adhesion is highly detrimental and examples include pathogenic biofilm infections on medical implants and devices and bio-corrosion of pipelines and ship hulls. Studies have demonstrated that the metabolic state of adhered bacteria can vary based on the physiochemical properties of the solid surface, but ...


Integrating Tunable Anion Exchange With Reverse Osmosis For Enhanced Recovery During Inland Brackish Water Desalination, Ryan Casey Smith Jan 2015

Integrating Tunable Anion Exchange With Reverse Osmosis For Enhanced Recovery During Inland Brackish Water Desalination, Ryan Casey Smith

Theses and Dissertations

For inland desalination plants, managing and discarding produced brine leftover from the production of pure drinking water can be a significant operating cost. By increasing the recovery of the desalination process, brine volume and disposal costs will be reduced. Achieving high recovery is not immediately possible as when the recovery is increased, there is a higher potential for the precipitation of calcium sulfate which, for reverse osmosis (RO) processes, can foul and damage the RO membrane. Ion exchange may be used as a pretreatment method to selectively remove and replace sulfate by chloride which does not pose any threat to ...