Matching Items (13)
Filtering by
- Creators: Barrett, The Honors College
- Creators: Kavazanjian, Edward
- Creators: Allenby, Braden
- Creators: Cadillo – Quiroz, Hinsby
Description
Currently conventional Subtitle D landfills are the primary means of disposing of our waste in the United States. While this method of waste disposal aims at protecting the environment, it does so through the use of liners and caps that effectively freeze the breakdown of waste. Because this method can keep landfills active, and thus a potential groundwater threat for over a hundred years, I take an in depth look at the ability of bioreactor landfills to quickly stabilize waste. In the thesis I detail the current state of bioreactor landfill technologies, assessing the pros and cons of anaerobic and aerobic bioreactor technologies. Finally, with an industrial perspective, I conclude that moving on to bioreactor landfills as an alternative isn't as simple as it may first appear, and that it is a contextually specific solution that must be further refined before replacing current landfills.
ContributorsWhitten, George Avery (Author) / Kavazanjian, Edward (Thesis director) / Allenby, Braden (Committee member) / Houston, Sandra (Committee member) / Civil, Environmental and Sustainable Engineering Programs (Contributor) / Barrett, The Honors College (Contributor)
Created2013-05
Description
Human beings are social creatures and need social connections to thrive in society. I observed low social connectedness amongst the students with disabilities in my high school and wanted to do more research on the cause of this occurrence. In my literary analysis and proposal, I highlight the effects social isolation and loneliness have on the well-being of people. While concluding that negative health effects come from low social connection, I researched the prevalence of low social connection amongst the disabled population and found that although low social connectedness can impact anyone, those with disabilities experience more low social connectedness than those without disabilities. I then analyzed ways in which low social connection can be addressed and focused on measuring social isolation and loneliness as indicators of low connectedness. I proposed a promising mentorship program intervention for my chosen population, young adults with disabilities, to help them increase social connection. This proposal may be adapted for use with any population. My goal for this program is to help increase social connection, promote societal support, and increase self-esteem and knowledge of their desired career and life skills as they transition into adult roles. Furthermore, I hope this paper may help spread awareness and get society to think of ways interventions to promote social connectedness can be implemented for people, like young adults with disabilities, who experience low social connectedness.
ContributorsBabatunde, Oreoluwa (Author) / Pohl, Janet (Thesis director) / Dykstra, LeAnn (Committee member) / Barrett, The Honors College (Contributor) / Edson College of Nursing and Health Innovation (Contributor)
Created2023-12
Description
I have designed a college-level course to help college-aged students build and maintain healthy friendships. Every week, students will engage in collaborative activities and learn a variety of topics related to friendship, including the benefits of friendship, barriers to friendship, and friendship maintenance mechanisms. As part of their final project, students will demonstrate their knowledge of making and maintaining healthy friendships by completing a case study in which students will be expected to apply their learnings from class to a chosen friendship and observe how the friendship changes as a result. In order to establish the need for the course I made, I first conducted a literature review on friendship, loneliness, and factors that may contribute to young adults having difficulties making friends.
ContributorsLiu, Stephanie (Author) / Mox, Kyle (Thesis director) / Shiota, Michelle (Committee member) / Barrett, The Honors College (Contributor) / Department of Psychology (Contributor) / Economics Program in CLAS (Contributor) / School of Mathematical and Statistical Sciences (Contributor)
Created2023-05
Characterization and Manipulation of Microbiomes From Arid Landfills for Improved Methane Production
Description
Environmentally harmful byproducts from solid waste’s decomposition, including methane (CH4) emissions, are managed through standardized landfill engineering and gas-capture mechanisms. Yet only a limited number of studies have analyzed the development and composition of Bacteria and Archaea involved in CH4 production from landfills. The objectives of this research were to compare microbiomes and bioactivity from CH4-producing communities in contrasting spatial areas of arid landfills and to tests a new technology to biostimulate CH4 production (methanogenesis) from solid waste under dynamic environmental conditions controlled in the laboratory. My hypothesis was that the diversity and abundance of methanogenic Archaea in municipal solid waste (MSW), or its leachate, play an important role on CH4 production partially attributed to the group’s wide hydrogen (H2) consumption capabilities. I tested this hypothesis by conducting complementary field observations and laboratory experiments. I describe niches of methanogenic Archaea in MSW leachate across defined areas within a single landfill, while demonstrating functional H2-dependent activity. To alleviate limited H2 bioavailability encountered in-situ, I present biostimulant feasibility and proof-of-concepts studies through the amendment of zero valent metals (ZVMs). My results demonstrate that older-aged MSW was minimally biostimulated for greater CH4 production relative to a control when exposed to iron (Fe0) or manganese (Mn0), due to highly discernable traits of soluble carbon, nitrogen, and unidentified fluorophores found in water extracts between young and old aged, starting MSW. Acetate and inhibitory H2 partial pressures accumulated in microcosms containing old-aged MSW. In a final experiment, repeated amendments of ZVMs to MSW in a 600 day mesocosm experiment mediated significantly higher CH4 concentrations and yields during the first of three ZVM injections. Fe0 and Mn0 experimental treatments at mesocosm-scale also highlighted accelerated development of seemingly important, but elusive Archaea including Methanobacteriaceae, a methane-producing family that is found in diverse environments. Also, prokaryotic classes including Candidatus Bathyarchaeota, an uncultured group commonly found in carbon-rich ecosystems, and Clostridia; All three taxa I identified as highly predictive in the time-dependent progression of MSW decomposition. Altogether, my experiments demonstrate the importance of H2 bioavailability on CH4 production and the consistent development of Methanobacteriaceae in productive MSW microbiomes.
ContributorsReynolds, Mark Christian (Author) / Cadillo-Quiroz, Hinsby (Thesis advisor) / Krajmalnik-Brown, Rosa (Thesis advisor) / Wang, Xuan (Committee member) / Kavazanjian, Edward (Committee member) / Arizona State University (Publisher)
Created2022
Description
Zero-Valent Metals (ZVM) are highly reactive materials and have been proved to be effective in contaminant reduction in soils and groundwater remediation. In fact, zero-Valent Iron (ZVI) has proven to be very effective in removing, particularly chlorinated organics, heavy metals, and odorous sulfides. Addition of ZVI has also been proved in enhancing the methane gas generation in anaerobic digestion of activated sludge. However, no studies have been conducted regarding the effect of ZVM stimulation to Municipal Solid Waste (MSW) degradation. Therefore, a collaborative study was developed to manipulate microbial activity in the landfill bioreactors to favor methane production by adding ZVMs. This study focuses on evaluating the effects of added ZVM on the leachate generated from replicated lab scale landfill bioreactors. The specific objective was to investigate the effects of ZVMs addition on the organic and inorganic pollutants in leachate. The hypothesis here evaluated was that adding ZVM including ZVI and Zero Valent Manganese (ZVMn) will enhance the removal rates of the organic pollutants present in the leachate, likely by a putative higher rate of microbial metabolism. Test with six (4.23 gallons) bioreactors assembled with MSW collected from the Salt River Landfill and Southwest Regional Landfill showed that under 5 grams /liter of ZVI and 0.625 grams/liter of ZVMn additions, no significant difference was observed in the pH and temperature data of the leachate generated from these reactors. The conductivity data suggested the steady rise across all reactors over the period of time. The removal efficiency of sCOD was highest (27.112 mg/lit/day) for the reactors added with ZVMn at the end of 150 days for bottom layer, however the removal rate was highest (16.955 mg/lit/day) for ZVI after the end of 150 days of the middle layer. Similar trends in the results was observed in TC analysis. HPLC study indicated the dominance of the concentration of heptanoate and isovalerate were leachate generated from the bottom layer across all reactors. Heptanoate continued to dominate in the ZVMn added leachate even after middle layer injection. IC analysis concluded the chloride was dominant in the leachate generated from all the reactors and there was a steady increase in the chloride content over the period of time. Along with chloride, fluoride, bromide, nitrate, nitrite, phosphate and sulfate were also detected in considerable concentrations. In the summary, the addition of the zero valent metals has proved to be efficient in removal of the organics present in the leachate.
ContributorsPandit, Gandhar Abhay (Author) / Cadillo – Quiroz, Hinsby (Thesis advisor) / Olson, Larry (Thesis advisor) / Boyer, Treavor (Committee member) / Arizona State University (Publisher)
Created2019
Description
The purpose of this Honors Thesis was to first, understand the implications of social isolation and loneliness on an individuals’ physical and mental health and second, uncover successful strategies that individuals used to overcome social isolation and loneliness. This thesis used two primary data sets to draw conclusions about individuals’ subjective feelings of loneliness and isolation and to further understand what strategies were used to overcome these feelings. The results from this thesis demonstrated that individuals who successfully avoided feelings of social isolation and loneliness during the COVID-19 pandemic took up new activities, used strategies to facilitate communication, participated in community engagement, completed acts of service, practiced mindfulness and reflection, and made new connections.
ContributorsPishko, Claire (Author) / Harelson, Haley (Co-author) / Doebbeling, Bradley (Thesis director) / Meja, Mauricio (Committee member) / Barrett, The Honors College (Contributor) / School of Mathematical and Statistical Sciences (Contributor) / School of Molecular Sciences (Contributor)
Created2021-12
Description
For our thesis, we analyzed a set of data from the on-going longitudinal study, “Aging In the Time of COVID-19” (Guest et al., ongoing) from the Center for Innovation in Healthy and Resilient Aging at Arizona State University. This study researched how COVID-19 and the resulting physical/social distancing impacted aging individuals' health, wellbeing, and quality-of-life. The survey collected data regarding over 1400 participants’ social connections, health, and experiences during COVID-19. This study gathered information about participants’ comorbid conditions, age, sex, location, etc. We presented this work in the form of a website including the traditional elements of an Honors Thesis as well as a visual essay with the data analysis portion coded with the JavaScript library D3 and a list of resources for our target audience, older adults who are experiencing social isolation and/or loneliness.
ContributorsHarelson, Haley (Author) / Pishko, Claire (Co-author) / Doebbeling, Bradley (Thesis director) / Mejía, Mauricio (Thesis director) / Guest, Aaron (Committee member) / Barrett, The Honors College (Contributor) / School of Life Sciences (Contributor) / School of Mathematical and Statistical Sciences (Contributor)
Created2021-12
ContributorsHarelson, Haley (Author) / Pishko, Claire (Co-author) / Doebbeling , Bradley (Thesis director) / Mejía, Mauricio (Thesis director) / Guest, Aaron (Committee member) / Barrett, The Honors College (Contributor) / School of Life Sciences (Contributor)
Created2021-12
ContributorsHarelson, Haley (Author) / Pishko, Claire (Co-author) / Doebbeling , Bradley (Thesis director) / Mejía, Mauricio (Thesis director) / Guest, Aaron (Committee member) / Barrett, The Honors College (Contributor) / School of Life Sciences (Contributor)
Created2021-12
Description
this project is about interrupting existing patterns of urban loneliness. the project explores three urban typologies of loneliness and potential interferences for each landscape. obstacles to unloneliness are investigated, such as urban form and social media. each is evaluated for its effect on loneliness and how this effect can be used to influence urbanites to feel less lonely. the focus is on ideas and experimentation. physical interference seeks to challenge preconceptions of what a city is, how one experiences the urban environment, and the role social media plays in our daily lives. the goal is to determine a spatial representation of the effect urbanism and social media have on loneliness and to use that to suggest a new typology of public space to promote unloneliness within phoenix, san francisco, and new york city. physical interference is a manifestation of ideas surrounding the modern urban experience.
ContributorsMedeiros, Camille Nicole (Author) / Maddock, Bryan (Thesis director) / Neveu, Marc (Thesis director) / Cloutier, Scott (Committee member) / School of Sustainability (Contributor) / The Design School (Contributor) / Barrett, The Honors College (Contributor)
Created2019-05