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Effect of electrode coating and applied voltage of pulsed electric fields (PEF) on sludge solubilization

펄스전기장 (Pulsed Electric Fields)의 전극 코팅과 인가 전압에 따른 슬러지의 가용화 효과

  • Um, Se-Eun (Department of Nanobiotronics, Hoseo University) ;
  • Chang, In-Soung (Department of Environmental Engineering, Hoseo University)
  • 엄세은 (호서대학교 나노바이오트로닉스학과) ;
  • 장인성 (호서대학교 환경공학과)
  • Received : 2018.07.25
  • Accepted : 2018.10.05
  • Published : 2018.10.31

Abstract

Alternative technologies for sludge treatment and disposal need to be developed urgently because the amount of produced production has increased continuously. In this study, Pulsed Electric Fields (PEF) technique was applied for sludge solubilization and the performance was evaluated. The PEF equipped with electrodes coated by epoxy resin and teflon was inducted to the activated sludge suspension, and the effect of the coating materials on the solubilization was determined. In addition, the effect of the applied voltage on the solubilization yield was investigated as the applied voltage was increased from 6 to 12 and 15 kV. Sludge solubilization was not observed when the epoxy-coated electrode was used for PEF induction regardless of the applied voltage. However, sludge solubilization occurred when 12 and 15 kV were applied to the teflon-coated electrodes. The MLSS decreased to 9%, and the soluble-COD increased to 496% when the applied voltage was 15 kV. But sludge solubilization did not happen under 6 kV condition. The corona discharge was observed at applied voltages of 12 and 15 kV, (Ed- sorry but I cannot understand the following highlight) but if 6 kV, strongly indicating that the corona discharge make the sludge solubilized, which suggests that the critical voltage for sludge solubilization lies between 6 and 12 kV. Consequently, proper selection of electrode-coating materials and the applied voltage of PEF could lead to sludge solubilization by corona discharge.

Keywords

Electrode coating;Pulsed Electric Fields;Sludge;Solublization;Voltage

Acknowledgement

Supported by : 한국연구재단

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