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Selenium Reduction by Shigella Fergusonii Strain Tb42616 and Pantoea Vagans Strain Ewb32213-2 in Bioreactor Systems

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Selenium Reduction by Shigella Fergusonii Strain Tb42616 and Pantoea Vagans Strain Ewb32213-2 in Bioreactor Systems University of Kentucky UKnowledge Theses and Dissertations--Civil Engineering Civil Engineering 2019 BIOLOGICAL SELENIUM CONTROL: SELENIUM REDUCTION BY SHIGELLA FERGUSONII STRAIN TB42616 AND PANTOEA VAGANS STRAIN EWB32213-2 IN BIOREACTOR SYSTEMS Yuxia Ji University of Kentucky, [email protected] Author ORCID Identifier: https://orcid.org/0000-0002-4866-4856 Digital Object Identifier: https://doi.org/10.13023/etd.2019.393 Right click to open a feedback form in a new tab to let us know how this document benefits ou.y Recommended Citation Ji, Yuxia, "BIOLOGICAL SELENIUM CONTROL: SELENIUM REDUCTION BY SHIGELLA FERGUSONII STRAIN TB42616 AND PANTOEA VAGANS STRAIN EWB32213-2 IN BIOREACTOR SYSTEMS" (2019). Theses and Dissertations--Civil Engineering. 91. https://uknowledge.uky.edu/ce_etds/91 This Doctoral Dissertation is brought to you for free and open access by the Civil Engineering at UKnowledge. It has been accepted for inclusion in Theses and Dissertations--Civil Engineering by an authorized administrator of UKnowledge. For more information, please contact [email protected]. STUDENT AGREEMENT: I represent that my thesis or dissertation and abstract are my original work. Proper attribution has been given to all outside sources. I understand that I am solely responsible for obtaining any needed copyright permissions. I have obtained needed written permission statement(s) from the owner(s) of each third-party copyrighted matter to be included in my work, allowing electronic distribution (if such use is not permitted by the fair use doctrine) which will be submitted to UKnowledge as Additional File. I hereby grant to The University of Kentucky and its agents the irrevocable, non-exclusive, and royalty-free license to archive and make accessible my work in whole or in part in all forms of media, now or hereafter known. I agree that the document mentioned above may be made available immediately for worldwide access unless an embargo applies. I retain all other ownership rights to the copyright of my work. I also retain the right to use in future works (such as articles or books) all or part of my work. I understand that I am free to register the copyright to my work. REVIEW, APPROVAL AND ACCEPTANCE The document mentioned above has been reviewed and accepted by the student’s advisor, on behalf of the advisory committee, and by the Director of Graduate Studies (DGS), on behalf of the program; we verify that this is the final, approved version of the student’s thesis including all changes required by the advisory committee. The undersigned agree to abide by the statements above. Yuxia Ji, Student Dr. Yi-Tin Wang, Major Professor Dr. Timothy Taylor, Director of Graduate Studies BIOLOGICAL SELENIUM CONTROL: SELENIUM REDUCTION BY SHIGELLA FERGUSONII STRAIN TB42616 AND PANTOEA VAGANS STRAIN EWB32213-2 IN BIOREACTOR SYSTEMS ________________________________________ DISSERTATION ________________________________________ A dissertation submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy in the College of Engineering at the University of Kentucky By Yuxia Ji Lexington, Kentucky Director: Dr. Yi-Tin Wang, Professor of Civil Engineering Lexington, Kentucky 2019 Copyright © Yuxia Ji 2019 ABSTRACT OF DISSERTATION BIOLOGICAL SELENIUM CONTROL: SELENIUM REDUCTION BY SHIGELLA FERGUSONII STRAIN TB42616 AND PANTOEA VAGANS STRAIN EWB32213-2 IN BIOREACTOR SYSTEMS Se(VI) and Se(IV), as the two major species of selenium in water, are toxic to aquatic lives and may cause adverse health effects to humans at high levels. Biological reduction of Se(VI) is a two-stage process first from Se(VI) to Se(IV) and then from Se(IV) to Se(0) with potential accumulation of the more toxic Se(IV) due to the slower rate of the second stage. Selenium reduction was first evaluated with batch cultures of Shigella fergusonii strain TB42616 (TB) and Pantoea vagans strain EWB32213-2 (EWB) isolated in our laboratory from sludge and coal slurry sediment samples, respectively. In order to facilitate Se(VI) reduction and reduce Se(IV) accumulation, the Se(VI)-reducing strain TB was co-cultured with a Se(IV)-reducing strain EWB. Although Se(VI) reduction rate was not affected, Se(IV) reduction was significantly enhanced with low Se(IV) accumulation in the defined co-culture. Effects of culture composition as well as nitrate and arsenate on Se(VI) reduction were also investigated. A co-culture composition of 10:1 (EWB:TB) ratio was observed to achieve the best total selenium reduction. In addition, nitrate at 50 mg/L was observed to inhibit Se(IV) reduction but not Se(VI) reduction, while arsenate at 200 mg/L exhibited slight inhibition on both Se(VI) and Se(IV) reduction. Biokinetic parameters were optimized with a Monod-type kinetic model using batch pure culture data through the Robust Global Optimization Algorithm embedded in a computer package. Se(VI) reduction by the defined co-culture was then simulated and verified over a range of culture compositions and initial Se(VI) concentrations, respectively. An inter-species inhibition term was incorporated into the model to illustrate the competition for Se(IV) during Se(VI) reduction in the co-culture. The model showed a significant increase of Se(IV) accumulation with higher initial Se(VI) concentration. However, Se(IV) accumulation can be reduced with increasing population ratio of EWB to TB in the defined co-culture. The relatively high correlation coefficients suggested that the model was robust and applicable in simulating Se(VI) reduction by the defined co- culture. Since activated alumina was reported to be more effective for Se(IV) adsorption than Se(VI), the effect of biological activities on selenium removal was investigated using continuous-flow reactors packed with alum-impregnated activated alumina (AIAA) and cultured with a Se(VI)-reducing strain TB under various influent Se(VI) concentrations and hydraulic retention times (HRTs). A selenium removal efficiency of 92% was achieved in a bioreactor with initial biomass of 2.2×106 cells/g-AIAA after a 70-day operation period. Little improvement was observed by lowering the influent Se(VI) concentration from 50 to 10 mg/L while the removal efficiency was significantly enhanced by either extending the hydraulic retention time from 3.2 to 5.0 days or increasing the attached biomass during the startup. An increase in mass ratios of Se(VI) reduction by immobilized cells to adsorption by AIAA was also observed with increasing cell mass during the operation. Se(VI) reduction using continuous-flow reactors packed with strain TB immobilized Ca2+-alginate beads was investigated under various hydraulic retention times (HRT) and influent Se(VI) concentrations. A high removal efficiency up to 98.7% was achieved under an HRT of 5 days and an influent Se(VI) concentration of 400 mg/L. The results showed that the overall selenium removal was positively correlated to the bed height of the reactor and the HRT but not related to the influent Se(VI) concentration. The steady state was analyzed using a mathematical model based on Monod-type equations with four biokinetic parameters optimized including the half-velocity constants and maximum specific reduction rates. The relatively high correlation coefficients indicate that the model is robust and valid to simulate Se(VI) reduction in the gel-beads- packed continuous-flow system. KEYWORDS: Selenium reduction; Bioremediation; Bioreactor; Biomass; Activated alumina; Immobilized cells. Yuxia Ji (Name of Student) 07/02/2019 Date BIOLOGICAL SELENIUM CONTROL: SELENIUM REDUCTION BY SHIGELLA FERGUSONII STRAIN TB42616 AND PANTOEA VAGANS STRAIN EWB32213-2 IN BIOREACTOR SYSTEMS By Yuxia Ji Yi-Tin Wang Director of Dissertation Timothy Taylor Director of Graduate Studies 07/02/2019 Date ACKNOWLEDGMENTS I would like to express my sincere gratitude to all civil engineering staff, laboratory technicians, fellow students, and the dissertation committee without whom this dissertation cannot be accomplished. First, and most importantly, I would like to thank my advisor, Dr. Yi-Tin Wang, who provided friendly guidance and valuable advice throughout the period of my study. His positive attitude greatly benefited me and encouraged me not to compromise. In addition to supervise my research work, Dr. Wang was also dedicated in securing funding to support my study and the research expenses. I would also like to thank members of my dissertation advisory committee, Dr. Kelly Pennell, Dr. Lindell Ormsbee, Dr. Dibakar Bhattacharyya and the outside examiner, Dr. Steve Rankin from the Department of Chemical Engineering for reading my dissertation and offering valuable suggestions on my thesis. I particularly thank my parents for selflessly supporting me to purse higher education. I also want to express gratitude to my grandparents who stood unswervingly to support me from my childhood. I want to grieve over and mourn my grandfather, Liyun Tang, who passed away during my study. I’ll miss him forever. Last but not least, I would also like to appreciate the civil engineering staff members, Bettie Berry, Jessica Clark, Kimberly Kelly, Bob Day, Suzy Wampler, and Jim Norvell for their generous help and friendship. I sincerely thank laboratory technicians John May, Tricia Coakley, and Megan Combs for their technical support. iii This research was supported by a U.S. Geological Survey Grant from the Kentucky Water Resources Research Institute and a teaching assistantship from the Department of Civil Engineering at the University
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