4 research outputs found
Ammonium removal by liquidâliquid membrane contactors in water purification process for hydrogen production
© 2014 Balaban Desalination Publications. All rights reserved.
In this work, a liquidâliquid membrane contactor (LLMC) was evaluated to remove ammonia traces from water used for hydrogen production by electrolysis. Three operational parameters were evaluated: the feed flow rate, the initial ammonia concentration in the water stream, and the pH of solution. Synthetic aqueous solutions with ammonium concentration of 5â25Â mg L-1 and a sulfuric acid solution (pH 2) were supplied to the LLMC in countercurrent and open-loop configuration with flow rates between 2.72 Ă 10-6 and 22.6 Ă 10-6Â m3Â s-1 and the pH values of the solution with ammonium between 8 and 11. A 2D numerical model was developed considering advectionâdiffusion equation inside a single fiber of the lumen with fully developed laminar flow and liquidâgas equilibrium in the membraneâsolution interface. Predictions of the model were then validated against experimental data, which were found to be in good agreement. According to both, experimental data and numerical predictions, the hollow-fiber membrane contactor technology is a suitable alternative to remove ammonium from water and to feed the membrane distillation unit in order to fulfill water quality requirements for electrolysis-based hydrogen production.Peer ReviewedPostprint (author's final draft
Ammonium removal by liquidâliquid membrane contactors in water purification process for hydrogen production
© 2014 Balaban Desalination Publications. All rights reserved.
In this work, a liquidâliquid membrane contactor (LLMC) was evaluated to remove ammonia traces from water used for hydrogen production by electrolysis. Three operational parameters were evaluated: the feed flow rate, the initial ammonia concentration in the water stream, and the pH of solution. Synthetic aqueous solutions with ammonium concentration of 5â25Â mg L-1 and a sulfuric acid solution (pH 2) were supplied to the LLMC in countercurrent and open-loop configuration with flow rates between 2.72 Ă 10-6 and 22.6 Ă 10-6Â m3Â s-1 and the pH values of the solution with ammonium between 8 and 11. A 2D numerical model was developed considering advectionâdiffusion equation inside a single fiber of the lumen with fully developed laminar flow and liquidâgas equilibrium in the membraneâsolution interface. Predictions of the model were then validated against experimental data, which were found to be in good agreement. According to both, experimental data and numerical predictions, the hollow-fiber membrane contactor technology is a suitable alternative to remove ammonium from water and to feed the membrane distillation unit in order to fulfill water quality requirements for electrolysis-based hydrogen production.Peer Reviewe