A novel anionic electrodialysis membrane can be used to remove nitrate and nitrite from wastewater

Abstract

ab s t r ac tA recently developed anionic membrane has been found to be highly efficient for electrodialysis, a process commonly used to remove ions from aqueous solution. Nitrate ions are often present in too a high concentration in wastewater, therefore we investigated this electrodialysis system for their removal from aqueous solution. The good selectivity of the membrane for nitrate anions is shown by acid-base and spectrophotometric measurements, and also by comparison with the removal of acetate anions. This membrane itself is easy to prepare, shows good characteristics and could fi nd applications in large electrodialysis units.

Preparation of Pyridinium-Functionalized Magnetic Adsorbent and Its Application for Nitrate Removal from Aqueous Solution

“…A variety of methods are used for the removal of nitrate, such as chemical reduction (Zhou et al 2013;Ramavandi et al 2011;Mortazavi et al 2011;Fanning et al 2000), chemical denitrification (Zhou et al 2013), electrodialysis (Hmida et al 2010;Sahli et al 2008;Elmidaoui et al 2003), filtration (Mouthon-Bello and Zhou 2007;Jeong et al 2006), and adsorption (Hamoudi and Belkacemi 2013;Das Gupta et al 2012;Comba et al 2012) Among these techniques, adsorption is an important method for removing nitrate (Matusik 2014;Ahmad et al 2014;Loganathan et al 2013), because of its proper selectivity, simplicity, effectiveness, and regeneration. The tradition adsorbents have some problems on the lower adsorption capacity or long adsorption time; hence, developing new materials with high nitrate adsorption capacity and efficiency will be of great significance (Xu et al 2013a).…”