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    Assessing the Viability of Microalgae as a Bioremediation Method for Per- and Polyfluoroalkyl Substances (PFAS)

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    Author
    Bah, Abbass
    Issue Date
    2022
    Keywords
    Algae
    Bioremediation
    PFAS
    PFOA
    PFOS
    Advisor
    Ogden, Kimberly L.
    
    Metadata
    Show full item record
    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, presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
    Abstract
    Per- and Polyfluoroalkyl Substances (PFAS) are a class of emerging contaminants that accumulate in soils and groundwater, often finding their way into the bodies of humans and wildlife alike. Traditional treatment technologies for removing contaminants from water are either ineffective (chlorination, UV irradiation, advanced oxidization), or costly (granular activated carbon, ion exchange, reverse osmosis, nanofiltration). Thus, bioremediation has been looked into as a cheaper, more sustainable alternative for PFAS removal. This study seeks to evaluate the viability of biosorption via microalgae as a treatment method for PFAS-contaminated water supplies. C. sorokiniana was the algal species considered as it has exhibited the capability of removing toxic contaminants such as arsenic and uranium from groundwater. No significant growth inhibition was exhibited by the C. sorokiniana grown in 1 ppm PFOA and PFOS solutions. The linear growth rate of the control was 0.15 g/L/d while the linear growth rates for PFOA and PFOS were both 0.12 g/L/d. Over two weeks, C. sorokiniana exhibited 37% and 20% removal of PFOA in two sample flasks (PFOA 1 and PFOA 2 respectively) in addition to 9.2% and 20% removal of PFOS in two sample flasks (PFOS 1 and PFOS 2 respectively). Statistical significance was measured using a 2 – tailed Student’s t – test with a 5% significance level. The only statistically significant removal observed in these two weeks took place in the PFOA 1 flask. Using the Langmuir Adsorption Model, no adsorption of PFOA or PFOS to the algal cells was observed within the 24 hour experiment. These results imply that bioremediation via C. sorokiniana is feasible, but further work must be done to assess the efficacy and economic feasibility.
    Type
    text
    Electronic Thesis
    Degree Name
    M.S.
    Degree Level
    masters
    Degree Program
    Graduate College
    Chemical Engineering
    Degree Grantor
    University of Arizona
    Collections
    Master's Theses

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