Life-Cycle Assessment of Urine Diversion and Conversion to Fertilizer Products at the City Scale

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Show simple item record Hilton, Stephen
dc.contributor.advisor Keoleian, Gregory 2020-10-16T13:19:11Z NO_RESTRICTION en_US 2020-10-16T13:19:11Z 2020-08 202-08
dc.description.abstract Urine diversion has been proposed as an approach for producing renewable fertilizers and reducing nutrient loads to wastewater treatment plants. Life cycle assessment was used to compare environmental impacts of the operations phase of urine diversion and fertilizer processing systems (via 1) a urine concentration alternative and 2) a struvite precipitation and ion exchange alternative) at a city scale to conventional systems. Scenarios in Vermont, Michigan, and Virginia were modeled, along with additional sensitivity analysis to understand the importance of key parameters, such as the electricity grid and wastewater treatment method. Both urine diversion technologies had better environmental performance than the conventional system, and led to reductions of 29-47% in greenhouse gas emissions, 26-41% in energy consumption, approximately half the freshwater consumption, and 25-64% in eutrophication, while acidification ranged between a 24% decrease to a 90% increase. In some situations wastewater treatment chemical requirements were eliminated. The environmental performance improvement was usually dependent on offsetting the production of synthetic fertilizers. This study suggests that urine diversion could be applied broadly as a strategy for both improving wastewater management and decarbonization. en_US
dc.language.iso en_US en_US
dc.subject Life Cycle Assessment en_US
dc.subject urine diversion en_US
dc.subject wastewater en_US
dc.subject fertilizer en_US
dc.title Life-Cycle Assessment of Urine Diversion and Conversion to Fertilizer Products at the City Scale en_US
dc.type Thesis en_US
dc.description.thesisdegreename Master of Science en_US
dc.description.thesisdegreediscipline School for Environment and Sustainability en_US
dc.description.thesisdegreegrantor University of Michigan en_US
dc.contributor.committeemember Daigger, Glen
dc.identifier.uniqname sphilton en_US
dc.owningcollname Dissertations and Theses (Ph.D. and Master's)
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