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    Vermifiltration of Dairy Wastewater for Reuse: The Earthworm Revolution

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    azu_etd_hr_2017_0208_sip1_m.pdf
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    Author
    Stuffle, Calliandra Suzanne
    Issue Date
    2017
    Advisor
    Ogden, Kim
    
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    Publisher
    The University of Arizona.
    Rights
    Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
    Abstract
    The viability of using vermifiltration to remediate wastewater from a dairy processing plant to City of Phoenix disposal requirements was investigated. Contaminant species of concern were COD, BOD, and TSS. Vermifiltration uses a packed bed reactor with an active layer of worms and compost, where worms and associated microbes decompose contaminants from the wastewater. A pilot scale vermifiltration unit was built to investigate the feasibility of using Red Wiggler worms (Eisenia fetida) to treat wastewater from Shamrock Farms dairy processing plant. Approximately 80% of total organic carbon was removed from the wastewater in a 24 hour time period, while the experiment had not reached steady state. Projected removal of organic carbon at steady state matches literature values of over 90% removal. A full scale process was designed to remediate 600,000 gallons per day of wastewater onsite at the dairy processing plant. This optimized process includes an inlet stream heat exchanger to reduce the temperature to worm operating conditions and six vermifiltration beds with in-situ cooling. Water leaving the system meets disposal requirements. As designed, this process is not economically viable. Further research into species of worms with higher operating temperatures and heat dissipation methods could make this process economically sustainable.
    Type
    text
    Electronic Thesis
    Degree Name
    B.S.
    Degree Level
    bachelors
    Degree Program
    Honors College
    Chemical Engineering
    Degree Grantor
    University of Arizona
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    Honors Theses

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