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    Elucidating the fouling mechanism in pharmaceutical wastewater treatment by membrane distillation

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    Type
    Article
    Authors
    Guo, Jiaxin
    Fortunato, Luca cc
    Deka, Bhaskar Jyoti
    Jeong, Sanghyun
    An, Alicia Kyoungjin
    KAUST Department
    Water Desalination and Reuse Research Center (WDRC)
    Date
    2019-11-09
    Online Publication Date
    2019-11-09
    Print Publication Date
    2020-02
    Embargo End Date
    2021-11-09
    Permanent link to this record
    http://hdl.handle.net/10754/660382
    
    Metadata
    Show full item record
    Abstract
    This study investigated the fouling mechanism in pharmaceutical wastewater treatment by membrane distillation, with a focus on the interfacial electrokinetic effect between the membrane and foulants as well as the surface hydrophobicity effect, and an advanced in-situ optical coherence tomography (OCT) technology. Three antibiotics with different surface charges were used as feed solutions, consisting of cefotaxime (CTX, negatively charged), tobramycin (TOB, positively charged) and ciprofloxacin (CFX, neutral) for studying the interfacial electrokinetic effect. In order to study the influence of membrane hydrophobicity on the fouling process, two commercial membranes with different hydrophobicity were employed; commercial polyvinylidene fluoride (C-PVDF) and commercial polytetrafluoroethylene (C-PTFE). Additionally, we also fabricated a fouling resistant polyvinylidene fluoride (PVDF) membrane coated with perfluorooctyltriethoxysilane (FTES)-TiO2 nanoparticles to engineer the surface charge and energy, and to achieve a superhydrophobic surface. After the MD operation, OCT scans detected no visible foulant layer on the three negatively charged membranes when treating negatively charged CTX. On the other hand, in the case of positively charged TOB, the rejection efficiency was only 78% due to its accumulation behavior on the C-PVDF membrane surface, with a thick foulant layer (326–408 μm) and blockage of pores, while the TiO2-PVDF membrane exhibited a stable performance.
    Citation
    Guo, J., Fortunato, L., Deka, B. J., Jeong, S., & An, A. K. (2020). Elucidating the fouling mechanism in pharmaceutical wastewater treatment by membrane distillation. Desalination, 475, 114148. doi:10.1016/j.desal.2019.114148
    Sponsors
    This work was supported by the Research Grant Council of Hong Kong through Project 21201316 and 11207717, and the Basic Science Research Program Fund through the National Research Foundation of Korea (NFR) funded by the Ministry of Education (2017R1A6A3A04004335). The authors declare no competing financial interests.
    Publisher
    Elsevier BV
    Journal
    Desalination
    DOI
    10.1016/j.desal.2019.114148
    Additional Links
    https://linkinghub.elsevier.com/retrieve/pii/S001191641930699X
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.desal.2019.114148
    Scopus Count
    Collections
    Articles; Water Desalination and Reuse Research Center (WDRC)

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