Removal of nitrate by electrodialysis: effect of operation parameters
Ki Young Park,Ho Young Cha,Phrompol Chantrasakdakul,Kwanyong Lee,Ji Hyang Kweon,Sungjun Bae
Abstract
We investigated the effect of applied voltage and electrolyte concentration on the nitrate removal and its energy/current efficiency during the electrodialysis. The current increased as the applied voltage increased up to 30 V showing the limiting current density around 20 V. The nitrate removal efficiency (31 to 71% in 240 min) and energy consumption (11 to 77 W∙h/L) gradually increased as the applied voltage increased from 10 to 30 V. The highest current efficiency was obtained at 20 V. The increase in electrolyte concentration from 100 to 500 mM led to the dramatic increase of nitrate removal efficiency with much faster removal kinetics (100 % in 10 min).
Key Words
electrodialysis; nitrate removal; applied voltage; current efficiency; energy efficiency
Address
Ki Young Park, Ho Young Cha, Phrompol Chantrasakdakul and Kwanyong Lee — Department of Civil and Environmental System Engineering, Konkuk University, 120 Neungdong-ro, Gwangjin-gu, Seoul 05029, Republic of Korea
Ji Hyang Kweon and Sungjun Bae — Department of Environmental Engineering, Konkuk University, 120 Neungdong-ro, Gwangjin-gu, Seoul 05029, Republic of Korea
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