Martí Calatayud, MC.; Schneider, S.; Wessling, M. (2018). On the rejection and reversibility of fouling in ultrafiltration as assessed by hydraulic impedance spectroscopy. Journal of Membrane Science. 564:532-542. https://doi.org/10.1016/j.memsci.2018.07.021
Por favor, use este identificador para citar o enlazar este ítem: http://hdl.handle.net/10251/147313
Title:
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On the rejection and reversibility of fouling in ultrafiltration as assessed by hydraulic impedance spectroscopy
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Author:
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Martí Calatayud, Manuel César
Schneider, S.
Wessling, Matthias
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UPV Unit:
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Universitat Politècnica de València. Departamento de Ingeniería Química y Nuclear - Departament d'Enginyeria Química i Nuclear
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Issued date:
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Abstract:
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[EN] The manifestation of critical fluxes in membrane filtration has typically served to set an upper value above which detrimental fouling events and a substantial increase of membrane resistance occurs. Despite the ...[+]
[EN] The manifestation of critical fluxes in membrane filtration has typically served to set an upper value above which detrimental fouling events and a substantial increase of membrane resistance occurs. Despite the usefulness of critical flux concepts for conducting sustainable membrane processes, the specific phenomena causing them cannot be easily identified via conventional membrane filtration modes. Usually arbitrary fouling rates are selected to delimit the boundary between under- and over-critical flux operation. Timescales respective for colloidal matter accumulation are overlooked.
Frequency response analysis of transmembrane pressures has been recently presented as a highly-sensitive method to track fouling in ultrafiltration. This hydraulic impedance spectroscopy method allows not only measuring membrane resistances but also corresponding time constants related to colloidal matter accumulation. In this work, hydraulic impedance spectra are gained for the ultrafiltration of different model foulants to assess the origin of critical fluxes for two different membranes. A correlation among characteristic impedance features and the type of fouling could be established: the evolution of phase shift between flux and pressure at increasing fluxes allows identifying the formation of external fouling layers, while registering of hysteresis loops at reversed frequency sequences signals the development of irreversible internal fouling. The hydraulic impedance method emerges as a precise and more sensitive monitoring tool to diagnose the beginning and nature of critical fouling.
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Subjects:
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Hydraulic impedance spectroscopy
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Ultrafiltration
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Membrane rejection
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Fouling
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Critical flux
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Constant flux
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Copyrigths:
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Reconocimiento - No comercial - Sin obra derivada (by-nc-nd)
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Source:
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Journal of Membrane Science. (issn:
0376-7388
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DOI:
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10.1016/j.memsci.2018.07.021
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Publisher:
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Elsevier
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Publisher version:
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https://doi.org/10.1016/j.memsci.2018.07.021
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Project ID:
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BMBF/02WCL1334A
GENERALITAT VALENCIANA/APOSTD/2017/059
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Thanks:
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M.W. acknowledges the support through an Alexander-von-Humboldt Professorship. M.C. Marti-Calatayud is grateful for the funding received from the Generalitat Valenciana (APOSTD/2017/059). M.C. Marti-Calatayud also appreciates ...[+]
M.W. acknowledges the support through an Alexander-von-Humboldt Professorship. M.C. Marti-Calatayud is grateful for the funding received from the Generalitat Valenciana (APOSTD/2017/059). M.C. Marti-Calatayud also appreciates the helpful suggestions received by Tao Luo and Georg Linz, as well as the fruitful discussions with Sarah Armbruster. This work was supported by the German Federal Ministry of Education and Research (BMBF) through the project BRAMAR (02WCL1334A). We thank Synder Filtration for the supplied membranes.
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Type:
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Artículo
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