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Sea Water Reverse Osmosis Coupled with Water Electrolysis In this viewpoint, we sought to address these questions by presenting a case study of a PEM water electrolysis system for 50 tons/day H2 production capability coupled to a SWRO plant for its water feed (Figure 3). The process is powered by the grid, which sources electricity from both fossil and renewable sources. We analyze both the economic and environmental feasibility of using SWRO water for PEM water electrolysis. As shown in Figure 3, PEM electrolysis plant consists of the electrolyzer stacks and the mechanical and electrical balance of plant (BoP) components.34 The electrical BoP consists of the AC to DC rectifier for converting grid electricity while the mechanical BoP consists of other auxiliary components such as pumps, heat exchangers, temperature swing adsorption (TSA) subsystem and most importantly a deionizer (DI) system. 34 Figure 3. Schematic of grid-powered SWRO-PEM system for 50 tons/day hydrogen production. The design of SWRO and PEM systems are adapted from references34, 35. The SWRO plant contains the RO unit which uses a membrane barrier and pumping energy to separate salts from saline water. Using high-pressure pumps, water is forced through semi- permeable membranes that have a dense separation layer (thin film composite membrane) allowing the passage of pure water molecules while rejecting dissolved salts and other impurities.36 In addition, in order to control RO membrane (bio)fouling and scaling, the SWRO system 7PDF Image | Seawater Electrolysis for Hydrogen Production
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