2026-04-17T14:05:34Zhttps://recercat.cat/oai/request

oai:recercat.cat:2117/892562026-01-21T10:19:16Zcom_2072_1033col_2072_452950

Trace ammonium removal by liquid-liquid membrane contactors as water polishing step of water electrolysis for hydrogen production from a wastewater treatment plant effluent Licon Bernal, Edxon Eduardo Alcaraz Segura, Aurora Casas Garriga, Sandra Valderrama Ángel, César Alberto Cortina Pallás, José Luis Universitat Politècnica de Catalunya. Departament d'Enginyeria Química Universitat Politècnica de Catalunya. SETRI - Grup de Tècniques de Separació i Tractament de Residus Industrials Àrees temàtiques de la UPC::Enginyeria química Ammonium removal Buffer solution Hollow fiber Hydrogen production Membrane contactor Aigües residuals -- Depuració -- Eliminació d'amoni Membranes (Tecnologia) Electròlisi © 2016 Society of Chemical Industry. BACKGROUND: This work evaluates hollow fiber liquid-liquid membrane contactors (HFMC) as a polishing step for the removal of low levels of ammonium from water purified by (or being supplied to) a membrane distillation unit in order to fulfil the conductivity requirements of hydrogen production by water electrolysis. RESULTS: The influence of the operating conditions (flow, pH, ammonium concentration, buffer capacity) were evaluated under a closed-loop setup in order to achieve a reduction of total ammonia concentration in water, from 15 to 1mgL-1 to assure the production of water in the membrane distillation with a conductivity lower than 1 µS cm-1. These values were used to validate a numerical algorithm describing the system performance. In order to reach the ammonia concentration requirements and considering the low concentration of bicarbonate (low pH buffer capacity) in the treated water a buffer agent was added to the working solution. CONCLUSIONS: HFMC technology is a suitable solution to remove low levels of ammonium from water to values as low as 1mgL- 1NH3 through appropriate control of pH. The ammonium removal efficiency of the HFMC was improved by raising the pH or the flow rate. Finally, the model proposed provides a good description of the membrane contactor performance with minimal deviations when compared with experimental results. Peer Reviewed Postprint (published version) 2016-01-01 Article Licon , E., Alcaraz, A., Casas, S., Valderrama, C., Cortina, J. Trace ammonium removal by liquid-liquid membrane contactors as water polishing step of water electrolysis for hydrogen production from a wastewater treatment plant effluent. "Journal of chemical technology & biotechnology", 1 Gener 2016. 0268-2575 https://hdl.handle.net/2117/89256 10.1002/jctb.4923 eng http://onlinelibrary.wiley.com/doi/10.1002/jctb.4923/abstract;jsessionid=A7B1370E9531A4CDA69DC40089AAA0A7.f04t04?systemMessage=Wiley+Online+Library+will+be+unavailable+on+Saturday+30th+July+2016+from+08%3A00-11%3A00+BST+%2F+03%3A00-06%3A00+EST+%2F+15%3A00-18%3A00+SGT+for+essential+maintenance.Apologies+for+the+inconvenience. http://creativecommons.org/licenses/by-nc-nd/3.0/es/ Open Access application/pdf