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Electrically conductive spacers for self-cleaning membrane surfaces via periodic electrolysis / David, Gethin; Nidal, Hilal; Paolo, Bertoncello; Benjamin, Clifford

Desalination, Volume: 416, Pages: 16 - 23

Swansesa University Authors: David, Gethin, Nidal, Hilal, Paolo, Bertoncello, Benjamin, Clifford

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Abstract

The use of an electrically conductive membrane has attracted significant interest in water treatment technology due to remarkable performance in fouling mitigation domain. In electrochemical systems, when external potential is applied, water electrolysis occurs and the generated gases efficiently cl...

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Published in: Desalination
ISSN: 0011-9164
Published: 2017
Online Access: Check full text

URI: https://cronfa.swan.ac.uk/Record/cronfa33009
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Abstract: The use of an electrically conductive membrane has attracted significant interest in water treatment technology due to remarkable performance in fouling mitigation domain. In electrochemical systems, when external potential is applied, water electrolysis occurs and the generated gases efficiently clean the membrane surface. However, fabricating and integrating conductive membranes in current water treatment modules is challenging. The present work applies, for the first time, the electrolysis concept at the spacer component of the module rather than the membrane. Two types of materials were tested, a titanium metal spacer and a polymeric spacer. The polymeric spacer was made conductive via coating with a carbon-based ink comprised of graphene nanoplates (GNPs). A membrane system composed of the carbon coated/titanium metal spacer attached to the surface of a polyvinylidene fluoride (PVDF) microfiltration membrane and was assembled to the case of membrane module. The conductive spacers worked as an electrode (cathode) in electrochemical set-up. The membrane system was subjected to fouling and then exposed to periodic electrolysis, wherein in-situ cleaning of membrane surface by hydrogen bubbles generation at the spacer is applied.
Keywords: Membrane fouling; Conductive spacer; electrolysis; self-cleaning; bubble generation.
Start Page: 16
End Page: 23