Trace ammonium removal by liquid-liquid membrane contactors as water polishing step of water electrolysis for hydrogen production from a wastewater treatment plant effluent
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© 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.
CitacióLicon , 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.
Versió de l'editorhttp://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.
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