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- Creators: Debussy, Claude, 1862-1918
Description
This dissertation explores the use of bench-scale batch microcosms in remedial design of contaminated aquifers, presents an alternative methodology for conducting such treatability studies, and - from technical, economical, and social perspectives - examines real-world application of this new technology. In situ bioremediation (ISB) is an effective remedial approach for many contaminated groundwater sites. However, site-specific variability necessitates the performance of small-scale treatability studies prior to full-scale implementation. The most common methodology is the batch microcosm, whose potential limitations and suitable technical alternatives are explored in this thesis. In a critical literature review, I discuss how continuous-flow conditions stimulate microbial attachment and biofilm formation, and identify unique microbiological phenomena largely absent in batch bottles, yet potentially relevant to contaminant fate. Following up on this theoretical evaluation, I experimentally produce pyrosequencing data and perform beta diversity analysis to demonstrate that batch and continuous-flow (column) microcosms foster distinctly different microbial communities. Next, I introduce the In Situ Microcosm Array (ISMA), which took approximately two years to design, develop, build and iteratively improve. The ISMA can be deployed down-hole in groundwater monitoring wells of contaminated aquifers for the purpose of autonomously conducting multiple parallel continuous-flow treatability experiments. The ISMA stores all sample generated in the course of each experiment, thereby preventing the release of chemicals into the environment. Detailed results are presented from an ISMA demonstration evaluating ISB for the treatment of hexavalent chromium and trichloroethene. In a technical and economical comparison to batch microcosms, I demonstrate the ISMA is both effective in informing remedial design decisions and cost-competitive. Finally, I report on a participatory technology assessment (pTA) workshop attended by diverse stakeholders of the Phoenix 52nd Street Superfund Site evaluating the ISMA's ability for addressing a real-world problem. In addition to receiving valuable feedback on perceived ISMA limitations, I conclude from the workshop that pTA can facilitate mutual learning even among entrenched stakeholders. In summary, my doctoral research (i) pinpointed limitations of current remedial design approaches, (ii) produced a novel alternative approach, and (iii) demonstrated the technical, economical and social value of this novel remedial design tool, i.e., the In Situ Microcosm Array technology.
ContributorsKalinowski, Tomasz (Author) / Halden, Rolf U. (Thesis advisor) / Johnson, Paul C (Committee member) / Krajmalnik-Brown, Rosa (Committee member) / Bennett, Ira (Committee member) / Arizona State University (Publisher)
Created2013
ContributorsDebussy, Claude, 1862-1918 (Composer)
ContributorsDebussy, Claude, 1862-1918 (Composer)
ContributorsDebussy, Claude, 1862-1918 (Composer)
ContributorsDebussy, Claude, 1862-1918 (Composer)
ContributorsDebussy, Claude, 1862-1918 (Composer)
Description
Advancements in science and technology, particularly in the field of genome editing, hold significant potential to change how future generations will treat disease and may fundamentally change what it means to be human. There are concerns by scientists and non-scientists about how to explore the values and perceptions of the public regarding the implications of new technologies. Use of participatory Technology Assessment (pTA) has arisen as a type of interactive group discussion to disseminate information about technology and collect non-scientists' perceptions of the value, impact or usefulness of a technology and potential ethical issues or consequences to be considered. There is no one size fits all model of pTA; several are discussed in this paper, but there are similarities between them such as the structure of engagement or recruitment criteria. It is important to note a difference in public understanding of science and public engagement with science as it relates to the structure and execution of pTA. This study was undertaken to evaluate pTA as a tool to explore perceptions, values and opinions regarding a case study of CRISPR-Cas9, a tool for genome editing, among ASU Barrett undergraduate students.
ContributorsChapin, Natalie Ann (Author) / Brian, Jennifer (Thesis director) / Bennett, Ira (Committee member) / School of Life Sciences (Contributor) / Department of Psychology (Contributor) / Barrett, The Honors College (Contributor)
Created2016-12
Description
A comprehensive review of the managed retreat literature reveals mixed feelings towards the legality, practicality and cost of the policy action as a way to react to rising sea level and coastal erosion. Existing research shows increasing costs of severe storm damage borne to insurance companies and private citizens, furthering the need for long-term policy actions that mitigate the negative effects of major storms. Some main policy actions are restricting development, strategically abandoning infrastructure, funding buyout programs, utilizing rolling easements, and implementing a variety of protective structures. These policy actions face various problems regarding their feasibility and practicality as policy tools, including wavering public support and total costs associated with the actions. Managed retreat specifically faces public scrutiny, as many coastal property owners are reluctant to retreat from the shore. This paper will use examples of managed retreat in other countries (Netherlands, Belgium, and France) to develop plans for specific municipalities, using their models, costs and successes to generate in-depth policy plans and proposals. When observing Clatsop County, Oregon and assessing its policy options, its established that the best policy option is a combination of beach nourishment and Controlled Reduced Tides. This paper analyzes several features of the county, such as the importance of its coastal economic activity and its geographical makeup, to decide what policy actions would be best to mitigate its risk from sea level rise and flood damages. The process used to determine the best course of action for Clatsop County can be replicated in other municipalities, although the resulting policies will obviously be unique to the area.
ContributorsBarry, Matthew John (Author) / Wells, David (Thesis director) / Bennett, Ira (Committee member) / School of Public Affairs (Contributor) / Department of Economics (Contributor) / Barrett, The Honors College (Contributor)
Created2017-05
Description
The 21st century will be the site of numerous changes in education systems in response to a rapidly evolving technological environment where existing skill sets and career structures may cease to exist or, at the very least, change dramatically. Likewise, the nature of work will also change to become more automated and more technologically intensive across all sectors, from food service to scientific research. Simply having technical expertise or the ability to process and retain facts will in no way guarantee success in higher education or a satisfying career. Instead, the future will value those educated in a way that encourages collaboration with technology, critical thinking, creativity, clear communication skills, and strong lifelong learning strategies. These changes pose a challenge for higher education’s promise of employability and success post-graduation. Addressing how to prepare students for a technologically uncertain future is challenging. One possible model for education to prepare students for the future of work can be found within the Maker Movement. However, it is not fully understood what parts of this movement are most meaningful to implement in education more broadly, and higher education in particular. Through the qualitative analysis of nearly 160 interviews of adult makers, young makers and young makers’ parents, this dissertation unpacks how makers are learning, what they are learning, and how these qualities are applicable to education goals and the future of work in the 21st century. This research demonstrates that makers are learning valuable skills to prepare them for the future of work in the 21st century. Makers are learning communication skills, technical skills in fabrication and design, and developing lifelong learning strategies that will help prepare them for life in an increasingly technologically integrated future. This work discusses what aspects of the Maker Movement are most important for integration into higher education.
ContributorsWigner, Aubrey (Author) / Lande, Micah (Thesis advisor) / Allenby, Braden (Committee member) / Bennett, Ira (Committee member) / Arizona State University (Publisher)
Created2017
ContributorsDebussy, Claude, 1862-1918 (Composer)