| Title |
Continuous Nitrate Removal using Bipolar ZVI Packed Bed Electrolytic Cell |
| Authors |
정주영(Jeong, Joo-Young) ; 김한기(Kim, Han-Ki) ; 신자원(Shin, Ja-Won) ; 박주양(Park, Joo-Yang) |
| DOI |
https://doi.org/10.12652/Ksce.2012.32.1B.079 |
| Keywords |
암모니아;복극전해조;전기화학;질산성질소;영가철 ammonia;bipolar electrolytic cell;electrochemistry;nitrate;zero valent iron |
| Abstract |
Nitrate is a common contaminant in groundwater aquifer. The present study investigates the performance of the bipolar zero valent iron (ZVI, $Fe^0$) packed bed electrolytic cell in removing nitrate in different operating conditions. The packing mixture consists of ZVI as electronically conducting material and silica sand as non-conducting material between main cathode and anode electrodes. In the continuous experiments for the simulated wastewater (contaminated groundwater, initial nitrate about 30 mg/L as N and electrical conductivity about 300 ${\mu}S/cm$), over 99% removal of nitrate was achieved in the applied voltage 600 V and at the flow rate of 20 mL/min. The optimum packing ratio (v/v) and flow rate were determined to be 1:1~2:1 (silica sand to ZVI), 30 mL/ min respectively. Effluent pH was proportional to nitrate influx concentration, and ammonia which is the final product of nitrate reduction was about 60% of nitrate influx. Magnetite was observed on the surface of the used ZVI as major oxidation product. |