Up-scaling reverse electrodialysis.

08:00 EDT 13th August 2018 | BioPortfolio

Summary of "Up-scaling reverse electrodialysis."

Salinity gradient energy is a sustainable, renewable and clean energy source. When mixing waters with different salinities, the change in Gibbs free energy can be harvested as energy and only brackish water remains. Reverse electrodialysis (RED) is one of the technologies able to harvest this sustainable energy source. High power densities have been obtained in small lab-scale systems, but the translation to large industrial scale stacks is essential for commercialization of the technology. Moreover, not only power density is an important parameter, also efficiency, i.e. the amount of energy harvested compared to the amount of energy available in the feed waters, is critical for commercial processes. In the present work, we systematically investigate the influence of stack size and membrane type on power density, thermodynamic efficiency and energy efficiency. Results show that, the residence time is an excellent parameter to compare differently sized stacks and to translate lab scale experimental results to larger pilot stacks. Also, the influence of undesired water permeability and co-ion diffusion (as reflected in permselectivity) is clearly visible when measuring the thermodynamic efficiency. An averaged thermodynamic efficiency of 44.9% is measured when using Fujifilm Type 10 AEM and CEM membranes which have low water permeability and high permselectivity. This value comes close to the thermodynamic maximum of 50%.


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Name: Environmental science & technology
ISSN: 1520-5851


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