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Continuous Nitrate Removal using Bipolar ZVI Packed Bed Electrolytic Cell

영가철(Fe0) 충진 복극전해조를 이용한 질산성질소의 연속식 제거 연구

  • 정주영 (한양대학교 건설환경공학과) ;
  • 김한기 (한양대학교 건설환경공학과) ;
  • 신자원 (한양대학교 건설환경공학과) ;
  • 박주양 (한양대학교 건설환경공학과)
  • Received : 2011.10.24
  • Accepted : 2011.12.28
  • Published : 2012.02.29

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.

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