Earth’s field MRI for the non-invasive detection of fouling in spiral-wound membrane modules in pressure vessels during operation
Vrouwenvelder, Johannes S.
KAUST DepartmentWater Desalination and Reuse Research Center (WDRC)
Biological and Environmental Sciences and Engineering (BESE) Division
Environmental Science and Engineering Program
Permanent link to this recordhttp://hdl.handle.net/10754/652943
MetadataShow full item record
AbstractFouling of spiral-wound reverse osmosis (SWRO) membrane systems is a pervasive problem. Here we demonstrate that a mobile, low cost magnetic resonance imaging (MRI) apparatus operating at the earth’s magnetic field (low magnetic field, LF) can non-invasively (i) image the inside of a SWRO membrane system with glass fiber outside casing in a pressure vessel during cross flow operation and can (ii) detect the location of foulant, in this study sodium alginate. LF-MRI images of the module were successfully acquired in less than eight minutes using a spin-echo protocol, the internal structure of the modules was clearly evident and images compared well with high resolution MRIs obtained using a large-sized, costly high magnetic field superconducting MRI system. By parameter optimisation (specifically the echo time employed) it was possible to differentiate flowing and stagnant fluid in the clean and fouled membrane systems, and to determine the presence of alginate foulant on the feed-side of the fouled SWRO membrane system. This study motivates further investigation of the sensitivity of LF-MRI and the development of bespoke low cost LF-MRI hardware for the monitoring of industrial SWRO membrane installations.
CitationUjihara R, Fridjonsson EO, Bristow NW, Vogt SJ, Bucs SS, et al. (2018) Earth’s field MRI for the non-invasive detection of fouling in spiral-wound membrane modules in pressure vessels during operation. DESALINATION AND WATER TREATMENT 135: 16–24. Available: http://dx.doi.org/10.5004/dwt.2018.23156.
SponsorsR. Ujihara acknowledges scholarship funding from the Forrest Research Foundation. The authors acknowledge the facilities and scientific and technical assistance of the National Imaging Facility, a National Collaborative Research Infrastructure Strategy (NCRIS) capability, at the Centre for Microscopy, Characterisation and Analysis, The University of Western Australia, and especially the assistance of Dr. Kirk Feindel.
JournalDESALINATION AND WATER TREATMENT