Abstract
Electrodialysis (ED) of NaNO3 solutions was performed to stress the role of the membrane pair as a unit i.e. the behavior as a whole of Anion Exchange Membrane (AEM) and Cation Exchange Membrane (CEM), in the process at room temperature. The membrane pair was also tested in the reclamation of nitric acid and sodium hydroxide. It was found that the membrane pair ranking in Limiting Current Density does not agree with that of ions leakage and both rankings are not the same as for Current Efficiency or Specific Power Consumption, each parameter for a specific membrane pair depends on the associated membrane and at a lesser degree on the flow rate. Results show that one cannot select a membrane or a membrane pair only by its limiting current density i.e. it is necessary to evaluate several parameters of the process by characterizing the whole membrane pair and to decide the parameter of interest, i.e. denitrification speed, ions leakage, proton back migration, current efficiency or specific power consumption.
Highlights
The removal of nitrate from water sources that results from the use of fertilizers, industrial wastewater and human or animal waste disposal has been of great concern [1,2,3]
Electrodialysis (ED) of NaNO3 solutions was performed to stress the role of the membrane pair as a unit i.e. the behavior as a whole of Anion Exchange Membrane (AEM) and Cation Exchange Membrane (CEM), in the process at room temperature
The membrane pair was tested in the reclamation of nitric acid and sodium hydroxide
Summary
The removal of nitrate from water sources that results from the use of fertilizers, industrial wastewater and human or animal waste disposal has been of great concern [1,2,3]. For economic and environmental reasons, splitting of dissolved nitrate salts into, for example, sodium hydroxide and nitric acid is advantageous since these products may be recycled upstream in the process or reused elsewhere after further concentration by any other method as evaporation [18,19,20,21,22,23,24]. The principle of this operation lies on the membrane characteristics that allow the passage of cations trough CEM and anions trough AEM under the action of an electric field to produce acid and base. Specific power consumption to stress the importance of membrane pair behavior
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