Abstract Journal of Korean Society of Water and Wastewater Vol 26, No3, pp409-421, June, 2012 상하수도학회지, 논문 26권, 3호 pp409-421, 6월, 2012 1. 서 론 에탄올아민(ethanolamine, ETA, NH 2 CH 2 CH 2 OH)은 가압경수형 원자력 발전소 내 증기발생기를 순환하는 2차 계통의 pH를 조절하여 냉각수에 환원조건을 조성하고 금속재의 부식 및 관내 스케일링이 형성되는 것을 방지하기 위하여 사용된다(Cattant 등, 2008; Nordmann, 2004). 기존에는 pH 조절제로 암모니아를 사용하였으나 극심한 온도차(40~300℃) 및 압력차(6~5,000kPa)의 조건에서 증발이 쉽고 일부가 관내에 축적되는 단점이 있어 현재는 끓는점이 높아 쉽게 결합하여 증발되지 않고, 극성물질과 쉽게 결합하여 온도 변화에 따라 안정적인 ETA를 pH 조절제로 사용하고 있다. ETA는 안정한 형태의 유기화합물로써 수 3D 복극충진전기분해를 이용한 원전 ETA에 의해 유발된 폐수 내 COD 및 T-N 제거Removal of COD and T-N caused by ETA from Nuclear Power Plant Wastewater using 3D Packed Bed Bipolar Electrode System 김한기·정주영·신자원·박주양 * Han-Ki Kim·Joo-Young Jeong·Ja-Won Shin·Joo-Yang Park * 한양대학교 건설환경공학과 (2011년 12월17일 접수; 2012 3월14일 수정; 2012년 6월1일 채택)*Corresponding authoor : Tel.: 2220-0411, E-mail : jooypark@hanyang.ac.kr(J. Y. Park)Ethanolamine (ETA) is mainly used to prevent corrosion of pipe in secondary cooling system of nuclear power plant. Condensed ETA in wastewater could increase COD and T-N when it was emitted to natural water system. Compared to conventional treatments, elec-trochemical oxidation process using packed bed bipolar electrodes was adopted to treat COD and T-N. According to arrangement of feeder electrode, single packed bed bipolar electrode reactor and multi-paired packed bed bipolar reactor were developed and con-ventional zero-valent iron (ZVI) was selected as conducting bipolar electrode. Bipolar electrodes were coordinated three-dimensionally in the reactor. The experimental results showed that COD and T-N was little removed in unit system at different pH condition (pH 8 and 11) on 100V. However, in multi-paired system that applied 600V, COD was eliminated 80.85% (anode-cathode-anode, A-C-A) and 85.11% (cathode-anode-cathode, C-A-C), respectively. T-N was also removed 96.88% (A-C-A) and 90.63% (C-A-C), simultane-ously. Current efficiency was estimated both single and multi-paired system. At unit bipolar packed bed reactor, current efficiency was almost zero, however in multi-paired system, current efficiency was 300~500% at A-C-A and 250~350% at C-A-C. Current efficiency was over 100% hence it was confirmed that this system is more effective than conventional electrochemical oxidation system.Key words : ethanolamine, packed bed bipolar electrode reactor, electrochemical oxidation, nuclear power plant wastewater주제어: 에탄올아민, 복극충진전기분해조, 전기화학적 산화, 원자력발전 폐수