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    Enhanced ammonia recovery from wastewater by Nafion membrane with highly porous honeycomb nanostructure and its mechanism in membrane distillation

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    Ammonia recovery by Nafion in MD JMS 2019 online version.pdf
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    Type
    Article
    Authors
    Guo, Jiaxin
    Lee, Jung Gil
    Tan, Tian
    Yeo, Joonho
    Wong, Pak Wai
    Ghaffour, NorEddine cc
    An, Alicia Kyoungjin
    KAUST Department
    Biological and Environmental Sciences and Engineering (BESE) Division
    Environmental Science and Engineering
    Environmental Science and Engineering Program
    Water Desalination & Reuse Center
    Water Desalination and Reuse Research Center (WDRC)
    Date
    2019-07-17
    Online Publication Date
    2019-07-17
    Print Publication Date
    2019-07
    Embargo End Date
    2021-07-17
    Permanent link to this record
    http://hdl.handle.net/10754/656155
    
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    Abstract
    Removing nitrogen from wastewater by conventional treatment methods requires substantial energy, only to release it back to the atmosphere as gaseous nitrogen. Herein, we investigated the applicability of membrane distillation (MD) in resource recovery from sludge digestate by controlling the volatility and pressure of the vapor transport across the membrane to concentrate ammonia in the permeate stream. A mixture of Nafion ionomer and Multiwall Carbon Nanotubes (MWCNTs) were incorporated into a Poly (vinylidene fluoride-co-hexafluoropropene; PVDF-HFP) nanofiber matrix to fabricate a nanoporous honeycomb Nafion membrane featuring high recovery and increased mechanical strength. Theoretical modeling was conducted to predict the expected performance of the fabricated Nafion membrane under different operation conditions and to reveal the mechanism behind the enhanced recovery of Nafion membranes in the MD process. The resultant Nafion (8%)/MWCNT (2.5%)/PVDF-HFP nanofibrous membrane showed up to three times higher ammonia recovery compared to the commercial PVDF membrane from a feed with an ammonia concentration of 300 mg/L. The theoretical analysis quantitatively revealed that the Nafion containing membrane can not only suppress the negative effect of membrane's structural resistance on the ammonia recovery efficiency but also enhance the efficiency. In addition, we also uncovered that the effect of Nafion on ammonia recovery efficiency was maximized when the Nafion 8% membrane was employed. This study demonstrated an innovative and realistically applicable MD treatment process for recovering resource, which integrates low-grade heat and has scaling-up potential for wastewater treatment plants.
    Citation
    Guo, J., Lee, J.-G., Tan, T., Yeo, J., Wong, P. W., Ghaffour, N., & An, A. K. (2019). Enhanced ammonia recovery from wastewater by Nafion membrane with highly porous honeycomb nanostructure and its mechanism in membrane distillation. Journal of Membrane Science, 590, 117265. doi:10.1016/j.memsci.2019.117265
    Sponsors
    This work was fully supported by the Research Grant Council of Hong Kong through Project 11207717.
    Publisher
    Elsevier BV
    Journal
    Journal of Membrane Science
    DOI
    10.1016/j.memsci.2019.117265
    Additional Links
    https://linkinghub.elsevier.com/retrieve/pii/S0376738819310555
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.memsci.2019.117265
    Scopus Count
    Collections
    Articles; Biological and Environmental Sciences and Engineering (BESE) Division; Environmental Science and Engineering Program; Water Desalination and Reuse Research Center (WDRC)

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