Filtering by
- All Subjects: Sustainability
- Genre: Academic theses
- Creators: Basile, George
- Member of: ASU Electronic Theses and Dissertations
The built environment is responsible for a significant portion of global waste generation.
Construction and demolition (C&D) waste requires significant landfill areas and costs
billions of dollars. New business models that reduce this waste may prove to be financially
beneficial and generally more sustainable. One such model is referred to as the “Circular
Economy” (CE), which promotes the efficient use of materials to minimize waste
generation and raw material consumption. CE is achieved by maximizing the life of
materials and components and by reclaiming the typically wasted value at the end of their
life. This thesis identifies the potential opportunities for using CE in the built environment.
It first calculates the magnitude of C&D waste and its main streams, highlights the top
C&D materials based on weight and value using data from various regions, identifies the
top C&D materials’ current recycling and reuse rates, and finally estimates a potential
financial benefit of $3.7 billion from redirecting C&D waste using the CE concept in the
United States.
The results of my research indicated a number of important leverage points, including landfill fees, diversion mandates for organic waste, and renewable energy credits. Source separation of organic waste improves the range of uses, decreases processing costs, and facilitates P recovery, while creating jobs and contributing to a circular economy. Food is a significant component of the waste stream, and edible food is best diverted to food banks, while scraps are best given to livestock. Biomass energy systems produce multiple revenue streams, have high processing capacities, and concentrate P and other minerals to a greater extent than composting. Using recovered P in urban agriculture and native landscaping results in additional benefits to social-ecological systems by improving food security, reducing the urban heat island effect, sequestering carbon, and enhancing urban ecosystems.
Published frameworks were utilized to identify SB practices in use, and the Competing Values Framework (CVF) to identify dimensions of culture. Data from 1021 Corporate Sustainability Reports from 212 companies worldwide was collected for computerized text analysis, which provided a measure of the occurrence of a specific SB practice and the four dimensions of the CVF. Hypotheses were analyzed using cluster, crosstab, and t-test statistical methods.
The findings contribute significant insights to the Business and Sustainability field. Firstly, clustering of SB practice bundles identified organizations at various levels of SB practice awareness. The spectrum runs from a compliance level of awareness, to a set of organizations aware of the importance of culture change for sustainability. Top performing clusters demonstrated different priorities with regards to SB practices; these were in many cases, related to contextual factors, such as location or sector. This implies that these organizations undertook varying sustainability strategies, but all arrived at some successful level of sustainability. Another key finding was the association between the highest performing SB practice clusters and a culture dominated by Adhocracy values, corroborating theories presented in the literature, but were not empirically tested before.
The results of this research offer insights into the use of text analysis to study SB practices and organizational culture. Further, this study presents a novel attempt at empirically testing the relationship between SB practices and culture, and tying this to financial performance. The goal is that this work serves as an initial step in redefining the way in which businesses adopt SB practices. A transformation of SB practice adoption will lead to major improvements in sustainability strategies, and subsequently drive change for improved corporate sustainability.
Historically, Life Cycle Assessments (LCA) guided companies to make better decisions to improve the environmental impacts of their products. However, as new Circular Economy (CE) tools emerge, the usefulness of LCA in assessing linear products grow more and more obsolete. Research Question: How do LCA-based tools account for reuse/multiple life cycles of products verses CE-based tools?
The Kaiteki Innovation Framework (KIF) was used to address the question of circularity of two packaging materials using an Environmental LCA to populate its 12 CE dimensions. Any gaps were evaluated with 2 LCA- based and 2 CE-based tools to see which could address the leftover CE dimensions.
Results showed that to complete the KIF template, LCA data required one of the LCA-based tools: Social Life Cycle Assessment (SLCA) and both CE-based tools: Circular Transition Indicators (CTI) and Material Circularity Indicator (MCI) to supplement gaps in the KIF. The LCA addressed 5 of the KIF dimensions: Innovation Category Name, Description, GHG Impact, Other Environmental Impacts, and Value Chain Position. 3 analytical tools addressed 5 more:: Effect on Circularity, Social Impacts, Enabling Technologies, Tier 2 and 3 Requirements, and Value Chain Synergies. None of the tools could address the KIF Dimensions: State of Development or Scale Requirements. All in all, the KIF required both LCA-based and CE-based tools to cover social and socio-economic impacts from a cradle-to-cradle perspective with multiple circular loops in mind. These results can help in the research and development of innovative, circular products that can lead to a more environmentally preferred future.