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http://dx.doi.org/10.11001/jksww.2012.26.3.409

Removal of COD and T-N caused by ETA from Nuclear Power Plant Wastewater using 3D Packed Bed Bipolar Electrode System  

Kim, Han-Ki (한양대학교 건설환경공학과)
Jeong, Joo-Young (한양대학교 건설환경공학과)
Shin, Ja-Won (한양대학교 건설환경공학과)
Park, Joo-Yang (한양대학교 건설환경공학과)
Publication Information
Journal of Korean Society of Water and Wastewater / v.26, no.3, 2012 , pp. 409-421 More about this Journal
Abstract
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, electrochemical 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 conventional 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), simultaneously. 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.
Keywords
ethanolamine; packed bed bipolar electrode reactor; electrochemical oxidation; nuclear power plant wastewater;
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