MDC paper final.pdf
Final Accepted Manuscript
AffiliationDepartment of Chemical and Environmental Engineering, University of Arizona
Water and Energy Sustainable Technology (WEST) Center, University of Arizona
Membrane distillation coefficient
Membrane element design
MetadataShow full item record
CitationHardikar, M., Marquez, I., Phakdon, T., Sáez, A. E., & Achilli, A. (2022). Scale-up of membrane distillation systems using bench-scale data. Desalination.
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AbstractA procedure to design full-scale air gap membrane distillation (AGMD) processes is presented. A mathematical model was then developed for both direct contact membrane distillation (DCMD) and AGMD. The model is centered on solving local mass and energy balances using a finite difference approach. The full-scale model was calibrated by utilizing the membrane distillation coefficient (MDC) determined by DCMD bench-scale experiments, as the sole adjustable parameter. The MDC was then used to model the water production and energy efficiency of a spiral-wound AGMD full-scale element. The model yields accurate representation of full-scale AGMD elements using polytetrafluoroethylene (PTFE) and polyethylene (PE) membranes. Full-scale experimental results obtained over a wide range of feed flow rates (2 to 4.5 L/min), temperatures (40 to 80 °C), and salinities (0 to 200 g/L NaCl) confirmed that the developed procedure can be applied to model and design large-scale AGMD elements. Furthermore, the model guides the selection of specific temperature and flow conditions at a given salinity and element geometry to maximize water production and energy efficiency. This methodology is suitable for rapid evaluation of novel MD membranes performance in field AGMD applications.
Note24 month embargo; available online: 1 March 2022
VersionFinal accepted manuscript