Economic performance of membrane distillation configurations in optimal solar thermal desalination systems
Moore, Sarah E.
Arnold, Robert G.
Sáez, A. Eduardo
AffiliationUniv Arizona, Dept Chem & Environm Engn
General Materials Science
General Chemical Engineering
Water Science and Technology
MetadataShow full item record
CitationKaranikola, V., Moore, S. E., Deshmukh, A., Arnold, R. G., Elimelech, M., & Sáez, A. E. (2019). Economic performance of membrane distillation configurations in optimal solar thermal desalination systems. Desalination, 472, 114164.
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AbstractIn this study we provide a comprehensive evaluation of the economic performance and viability of solar membrane distillation (MD). To achieve this goal, process models based on mass and energy balances were used to find the minimum cost of water in MD systems. Three MD configurations: direct contact, sweeping gas, and vacuum MD, were compared in terms of economic cost and energy requirements in optimized, solar-driven desalination systems constrained to produce 10 m(3) d(-1) of distillate from 3.5% or 15% salinity water. Simulation results were used to calculate the water production cost as a function of 13 decision variables, including equipment size and operational variables. Non-linear optimization was performed using the particle swarm algorithm to minimize water production costs and identify optimal values for all decision variables. Results indicate that vacuum MD outperforms alternative MD configurations both economically and energetically, desalting water at a cost of less than $15 per cubic meter of product water (both initial salt levels). The highest fraction of total cost for all configurations at each salinity level was attributed to the solar thermal collectors-approximately 25% of the total present value cost. Storing energy in any form was economically unfavorable; the optimization scheme selected the smallest battery and hot water tank size allowed. Direct contact MD consumed significantly more energy (primarily thermal) than other MD forms, leading to higher system economic costs as well.
Note24 month embargo; published online: 28 October 2019
VersionFinal accepted manuscript
SponsorsAgnese Nelms Haury Program in Environment and Social Justice at the University of Arizona; Campus Executive Laboratory-Driven Research and Development program at Sandia National Laboratories; NSF Nanosystems Engineering Research Center for Nanotechnology-Enabled Water Treatment [EEC-1449500]